WO2024099254A1 - 变频驱动电路和烹饪设备 - Google Patents

变频驱动电路和烹饪设备 Download PDF

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Publication number
WO2024099254A1
WO2024099254A1 PCT/CN2023/129866 CN2023129866W WO2024099254A1 WO 2024099254 A1 WO2024099254 A1 WO 2024099254A1 CN 2023129866 W CN2023129866 W CN 2023129866W WO 2024099254 A1 WO2024099254 A1 WO 2024099254A1
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WO
WIPO (PCT)
Prior art keywords
circuit
power
control
variable frequency
heating elements
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
PCT/CN2023/129866
Other languages
English (en)
French (fr)
Inventor
刘兴华
程艳
黎青海
王夫宝
高伟
徐小平
高茂丰
刘晓东
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Guangdong Witol Vacuum Electronic Manufacture Co Ltd
Guangdong Midea Kitchen Appliances Manufacturing Co Ltd
Original Assignee
Guangdong Witol Vacuum Electronic Manufacture Co Ltd
Guangdong Midea Kitchen Appliances Manufacturing Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Guangdong Witol Vacuum Electronic Manufacture Co Ltd, Guangdong Midea Kitchen Appliances Manufacturing Co Ltd filed Critical Guangdong Witol Vacuum Electronic Manufacture Co Ltd
Priority to EP23887944.9A priority Critical patent/EP4598270A4/en
Priority to JP2025522727A priority patent/JP2025537496A/ja
Publication of WO2024099254A1 publication Critical patent/WO2024099254A1/zh
Priority to US19/201,796 priority patent/US20250318023A1/en
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B6/00—Heating by electric, magnetic or electromagnetic fields
    • H05B6/64—Heating using microwaves
    • H05B6/66—Circuits
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B6/00—Heating by electric, magnetic or electromagnetic fields
    • H05B6/64—Heating using microwaves
    • H05B6/66—Circuits
    • H05B6/68—Circuits for monitoring or control
    • H05B6/687—Circuits for monitoring or control for cooking
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B6/00—Heating by electric, magnetic or electromagnetic fields
    • H05B6/64—Heating using microwaves
    • H05B6/647—Aspects related to microwave heating combined with other heating techniques
    • H05B6/6473—Aspects related to microwave heating combined with other heating techniques combined with convection heating
    • H05B6/6479—Aspects related to microwave heating combined with other heating techniques combined with convection heating using steam
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B1/00—Details of electric heating devices
    • H05B1/02—Automatic switching arrangements specially adapted to apparatus ; Control of heating devices
    • H05B1/0202—Switches
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B1/00—Details of electric heating devices
    • H05B1/02—Automatic switching arrangements specially adapted to apparatus ; Control of heating devices
    • H05B1/0227—Applications
    • H05B1/0252—Domestic applications
    • H05B1/0258—For cooking
    • H05B1/0261—For cooking of food
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B6/00—Heating by electric, magnetic or electromagnetic fields
    • H05B6/64—Heating using microwaves
    • H05B6/647—Aspects related to microwave heating combined with other heating techniques
    • H05B6/6482—Aspects related to microwave heating combined with other heating techniques combined with radiant heating, e.g. infrared heating
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B6/00—Heating by electric, magnetic or electromagnetic fields
    • H05B6/64—Heating using microwaves
    • H05B6/66—Circuits
    • H05B6/664—Aspects related to the power supply of the microwave heating apparatus
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B6/00—Heating by electric, magnetic or electromagnetic fields
    • H05B6/64—Heating using microwaves
    • H05B6/66—Circuits
    • H05B6/666—Safety circuits
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B6/00—Heating by electric, magnetic or electromagnetic fields
    • H05B6/64—Heating using microwaves
    • H05B6/66—Circuits
    • H05B6/68—Circuits for monitoring or control
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B6/00—Heating by electric, magnetic or electromagnetic fields
    • H05B6/64—Heating using microwaves
    • H05B6/66—Circuits
    • H05B6/68—Circuits for monitoring or control
    • H05B6/681—Circuits comprising an inverter, a boost transformer and a magnetron
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
    • Y02B40/00—Technologies aiming at improving the efficiency of home appliances, e.g. induction cooking or efficient technologies for refrigerators, freezers or dish washers

Definitions

  • the present application relates to the field of drive technology, and in particular to a variable frequency drive circuit and a cooking device.
  • frequency conversion technology has been applied to the control of microwave generators.
  • frequency conversion technology has not been applied to other heating methods. Based on this, when other heating methods are used for heating, the energy efficiency and heating performance of the cooking equipment are still relatively low and cannot meet the current energy efficiency needs.
  • the present application aims to solve at least one of the technical problems existing in the prior art or related technology.
  • a first aspect of the present application is to provide a variable frequency drive circuit.
  • a second aspect of the present application is to provide a cooking device.
  • the present application provides a variable frequency drive circuit for a cooking device, the cooking device includes at least two heating elements, the at least two heating elements include a microwave generator, including: a power circuit, the power circuit includes a first switch element, the first switch element is used to adjust the output power of the power circuit, the power circuit is connected to the common connection end of the at least two heating elements; a load selection circuit, the load selection circuit is connected to the power circuit, the load selection circuit has at least two output ends, and the at least two output ends are used to connect to the corresponding heating elements; a control circuit, connected to the control end of the first switch element and the load selection circuit, used to determine the target output power and the target heating element of the at least two heating elements according to the received control information, and control the first switch element to act according to the target power and the load selection circuit to select the target heating element to power on and operate.
  • a microwave generator including: a power circuit, the power circuit includes a first switch element, the first switch element is used to adjust the output power of the power circuit, the power circuit
  • the technical solution of the present application proposes a variable frequency drive circuit, which includes a power circuit, a load The load selection circuit and the control circuit.
  • the power circuit can realize the adjustment of power.
  • the load selection circuit is used to realize the selection of load.
  • the frequency conversion control applied to the microwave generator is applied to other heating elements.
  • other heating elements can also realize frequency conversion control like the microwave generator, which overcomes the problem in the related technical solutions that when other heating elements except the microwave generator are used for heating, the energy efficiency and heating performance are still relatively low and cannot meet the energy efficiency requirements at this stage.
  • the above technical solution of the present application realizes the reuse of the same power circuit by different heating elements. While other heating elements except the microwave generator realize variable frequency control, there is no need to add additional circuits for realizing frequency conversion, thereby reducing the cost required for realizing variable frequency control for other heating elements.
  • control information can be understood as the control instructions received by the cooking device.
  • control information can be a microwave function, 300 watts, a baking function, 1000 watts; or a steaming function, 180°C, etc.
  • the first switch element located in the power circuit can be controlled by the control circuit to adjust the conduction time within the unit period.
  • the longer the conduction time within the unit time the greater the output power of the power circuit.
  • the shorter the conduction time within the unit time the smaller the output power of the power circuit.
  • the power circuit is a circuit for adjusting the power supplied to the heating element
  • the load selection circuit is used to select the heating element currently running in the cooking equipment. Based on the coordinated use of the two, variable frequency control of different heating elements can be achieved.
  • the first switching element is an insulated gate bipolar transistor (IGBT), wherein the IGBT is a composite fully controlled voltage-driven power semiconductor device composed of a bipolar junction transistor (BJT) and an insulated gate field effect transistor (MOS), and has the advantages of both the high input impedance of a metal-oxide-semiconductor field-effect transistor (MOSFET) and the low on-state voltage drop of a power transistor (Giant Transistor, GTR).
  • IGBT insulated gate bipolar transistor
  • BJT bipolar junction transistor
  • MOS insulated gate field effect transistor
  • variable frequency drive circuit proposed in this application also has the following additional technical features.
  • the above technical solution also includes: a communication circuit, which is connected to the control circuit and is used to receive control information and send the control information to the control circuit; wherein the control information is a pulse width modulation signal, and the frequency of the pulse width modulation signal corresponds one-to-one to the heating element.
  • a communication circuit is provided so as to form data between the communication circuit and the computer board. Communication, so that when the computer board receives the function and operating power selected by the user, that is, when it receives the control information mentioned above, the control information is forwarded to the control circuit for the control circuit to control the power circuit and the load selection circuit, thereby realizing variable frequency drive and control of different heating elements.
  • the frequencies of pulse width modulation signals used by different heating elements are different. Therefore, the communication circuit can be used to realize the selection of different heating elements. In this process, multiple heating elements reuse the same communication circuit, which reduces the manufacturing cost of the cooking equipment.
  • the load selection circuit has a first input terminal
  • the power circuit also includes: a rectifier circuit, having a second input terminal and a third input terminal, a first output terminal and a second output terminal, the second input terminal and the third input terminal are used to connect to the AC terminal, the first output terminal is connected to the first input terminal, the second output terminal is connected to the first terminal of the first switch element, and the second terminal of the first switch element is connected to the common connection terminal.
  • the power circuit includes a rectifier circuit, wherein the rectifier circuit is configured to convert the AC power provided by the AC terminal into DC power.
  • the above-mentioned variable frequency drive circuit can be applied to AC power supply scenarios, thereby broadening the application scenarios of the variable frequency drive circuit.
  • the second output end of the rectifier circuit is connected to the first input end of the load selection circuit, and the second output end of the rectifier circuit is connected to the common connection end through the first switch element, so that the first switch element can control the power supply of the direct current output by the rectifier circuit to the load selection circuit, thereby realizing the adjustment of the power input to the load selection circuit.
  • the load selection circuit can be understood as a single-pole multi-throw switch, wherein the moving contact in the single-pole multi-throw switch is connected to the second output end of the rectifier circuit, and each static contact in the single-pole multi-throw switch is connected to a heating element, so that after a moving contact in the single-pole multi-throw switch selects a static contact to connect, power is supplied to the heating element corresponding to the static contact.
  • the rectifier circuit can be understood as a rectifier.
  • the rectifier is a bridge rectifier.
  • the bridge rectifier is composed of four rectifier silicon chips connected in a bridge manner and packaged with insulating plastic.
  • a high-power bridge rectifier is encapsulated with a zinc metal shell outside the insulating layer to enhance heat dissipation.
  • the power circuit also includes: a filter circuit, the filter circuit includes: a first resistor, a first end of the first resistor is connected to the first output end, and a second end of the first resistor is connected to the second output end; a capacitor, the capacitor is connected in parallel with the first resistor.
  • a filtering circuit is provided so as to utilize the filtering circuit to rectify the high-frequency voltage fluctuation in the direct current output by the circuit, thereby ensuring that the filtered direct current can stably supply power to the load selection circuit. Reduce power supply fluctuations that may cause abnormal operation of the heating element.
  • the characteristics of the capacitor prevent the voltage across the capacitor from changing suddenly. Therefore, the capacitor has the characteristic of hindering the rate of change of voltage. Based on this, the filtered DC power can be smoother, thereby reducing the voltage fluctuation in the power circuit.
  • the power circuit further includes: a reactor located between the first end of the first resistor and the first output end.
  • a reactor is provided so that the reactor can be used in conjunction with a filter circuit to limit high-order harmonics in a power circuit, thereby improving power loss in the power circuit.
  • the reactor includes a coil.
  • the power circuit also includes: a detection circuit, the input end of the detection circuit is connected to the second input end and the third input end, and the output end of the detection circuit is connected to the control circuit; wherein, when there is a surge fluctuation between the second input end and the third input end, the control circuit controls the power circuit to stop working.
  • a detection circuit is set up so that the detection circuit can be used to read the size of the power supply voltage entering the rectifier circuit. Then, when the voltage entering the rectifier circuit is too low or too high, the power circuit is controlled to stop working, so as to reduce the probability of damage to the variable frequency drive circuit due to power supply abnormality.
  • it also includes: a driving circuit, located between the control circuit and the control end of the first switch element, for driving the first switch element to operate.
  • the first switch element requires a larger current or voltage to achieve drive control, while the control circuit has limited output voltage or current when controlling the first switch element, and it is difficult to achieve control of the first switch element.
  • the technical solution of the present application sets a drive circuit between the control circuit and the first switch element, so that the control circuit uses the drive circuit to achieve drive control of the first switch element.
  • the setting of the drive circuit indirectly improves the driving capability of the control circuit.
  • the load selection circuit includes a multi-way switch, an input end of the multi-way switch is connected to the power circuit, and at least two output ends of the multi-way switch are used to connect to corresponding heating elements.
  • the load selection circuit when the heating element connected to the frequency conversion control circuit includes a first heating element and a second heating element, the load selection circuit includes: a relay having a moving contact and two static contacts, the moving contact is connected to the first output end, the first of the two static contacts is connected to the first heating element, and the second of the two static contacts is connected to the second heating element; a second switch element, the first end of the second switch element is connected to the first power supply through the relay, and the second end of the second switch element is grounded; based on the second switch element being turned on, the relay is powered on, the moving contact is connected to the first static contact, and the first heating element is powered on and operated; based on the second switch element being turned off, the relay When the power is off, the attraction is disconnected, the moving contact is connected with the second static contact, and the second heating element is powered on and operates.
  • a relay is an electrical control device, which is an electrical appliance that causes a predetermined step change in the controlled quantity in the electrical output circuit when the change in the input quantity (excitation quantity) reaches the specified requirements. It is actually an "automatic switch” that uses a small current to control the operation of a large current. Based on this, a small current can be used to control the operation of a large current. Usually, the small current and the large current are in different circuits, so there is an isolation effect between the two, which improves the safety of the variable frequency drive circuit.
  • a second switch element is provided so as to utilize the second switch element to realize the control of a small current.
  • the second switch element is a triode, wherein the driving control of the triode does not require the setting of a driving circuit, but is directly connected to the control circuit, thereby reducing the complexity of the overall circuit and the difficulty of design.
  • the present application provides a cooking device, comprising: at least two heating elements, at least two heating elements comprising microwave generators; a variable frequency drive circuit such as any of the above, at least two heating elements being connected to the variable frequency drive circuit.
  • the technical solution of the present application proposes a cooking device, wherein the cooking device includes the variable frequency drive circuit as described above, and the variable frequency drive circuit includes a power circuit, a load selection circuit and a control circuit.
  • the power circuit can adjust the power, and after the load selection circuit is connected to the power circuit, the load selection circuit is used to select the load.
  • the variable frequency control applied to the microwave generator is applied to other heating elements.
  • other heating elements can also achieve variable frequency control like the microwave generator, which overcomes the problem in the related technical solutions that when other heating elements other than the microwave generator are used for heating, the energy efficiency and heating performance are still relatively low and cannot meet the energy efficiency requirements at this stage.
  • the above technical solution of the present application realizes the reuse of the same power circuit by different heating elements. While other heating elements except the microwave generator realize variable frequency control, there is no need to add additional circuits for realizing frequency conversion, thereby reducing the cost required for realizing variable frequency control for other heating elements.
  • control information can be understood as the control instructions received by the cooking device.
  • control information can be a microwave function, 300 watts, a baking function, 1000 watts; or a steaming function, 180°C, etc.
  • the first switch element in the power circuit can be controlled by the control circuit to adjust the conduction time in the unit cycle.
  • the longer the conduction time in the unit time the longer the power circuit Conversely, the shorter the conduction time per unit time, the smaller the output power of the power circuit.
  • the power circuit is a circuit for adjusting the power supplied to the heating element
  • the load selection circuit is used to select the heating element currently running in the cooking equipment. Based on the coordinated use of the two, variable frequency control of different heating elements can be achieved.
  • the above technical solution also includes: a computer board; a third switch connected to the computer board and the power circuit.
  • the computer board receives a start signal from the cooking device, the third switch is turned on to supply power to the power circuit.
  • the computer board can be understood as the control board of the cooking device, which is a component for interaction between the user and the cooking device.
  • the computer board has a control panel, and the user can send control information to the variable frequency drive circuit through the control panel to control the operation of the variable frequency drive circuit.
  • a third switch is provided so as to control whether to supply power to the variable frequency drive circuit.
  • the cooking device can control the on and off of the third switch according to actual use needs. Specifically, when it is not necessary to start the heating element of the cooking device, the third switch is controlled to be off so as to cut off the power supply to the variable frequency drive circuit. When it is necessary to start the heating element of the cooking device for heating, the third switch is controlled to be on so as to supply power to the variable frequency drive circuit. When the power is supplied to the variable frequency drive circuit, the power circuit, the load selection circuit, the control circuit, etc. in the variable frequency drive circuit are powered on and operated. The provision of the third switch improves the safety of the cooking device.
  • the communication circuit of the variable frequency drive circuit is connected to the computer board and is used to send control information to the communication circuit.
  • At least two heating elements further include: a steam generator and/or a heating tube.
  • the microwave generator includes: a magnetron; a step-up transformer, the first primary coil of the step-up transformer is connected to the power circuit, and the first secondary coil of the step-up transformer is connected to the magnetron; and a voltage doubling circuit is connected to the second secondary coil of the step-up transformer and the magnetron.
  • the first secondary coil has a first connection end and a second connection end
  • the magnetron has a first connection end, a second connection end and a third connection end, wherein the third connection end of the magnetron is used for grounding, and the first secondary coil has a first connection end and a second connection end.
  • the first connection end of the coil is connected to the first connection end of the magnetron
  • the second connection end of the first secondary coil is connected to the second connection end of the magnetron
  • the second secondary coil has a first connection end and a second connection end
  • the voltage doubler circuit includes a first connection end, a second connection end, a third connection end and a fourth connection end, wherein the first connection end of the second secondary coil is connected to the first connection end of the voltage doubler circuit, the second connection end of the second secondary coil is connected to the second connection end of the voltage doubler circuit, and the fourth connection end of the voltage doubler circuit is connected to the third connection end of the magnetron, that is, the fourth connection end of the voltage doubler circuit and the third connection end of the magnetron are in common ground, and the third connection end of the voltage doubler circuit is connected to the first connection end of the first secondary coil so as to increase the voltage value on the first connection end of the magnetron.
  • the voltage doubling circuit includes a first diode, a second diode, a first capacitor and a second capacitor, wherein the anode of the first diode is connected to the cathode of the second diode and the first connection end of the second secondary coil, the cathode of the first diode is connected to the first end of the first capacitor and the third connection end of the magnetron, the second end of the first capacitor is connected to the first end of the second capacitor, the second end of the second capacitor is connected to the first connection end of the first secondary coil, the anode of the second diode is connected to the first connection end of the first secondary coil, and the second connection end of the second secondary coil is connected to the second end of the first capacitor.
  • the first connection end of the magnetron, the second connection end of the magnetron and the third connection end of the magnetron are interface structures for connecting the voltage doubler circuit and the step-up transformer.
  • a power supply circuit the power supply circuit is connected to the second primary coil of the step-up transformer, and the power supply circuit is used to output a power supply voltage with a voltage value of a preset voltage.
  • the power supply circuit is used to cooperate with the step-up transformer to output a power supply voltage with a preset voltage to power the control circuit, the communication circuit, and the load selection circuit. In this process, there is no need to set a power supply separately for the control circuit, the communication circuit, and the load selection circuit, which is conducive to reducing the number of power supplies set in the cooking device, thereby increasing the design difficulty of the cooking device.
  • the power supply circuit is also connected to the first input terminal and the second input terminal of the rectifier circuit, so that the power supply circuit draws power from the first input terminal and the second input terminal of the rectifier circuit to power the control circuit, the communication circuit, and the load selection circuit, and after the control circuit, the communication circuit, and the load selection circuit are powered on, power is drawn from the step-up transformer based on the second primary coil.
  • one end of the voltage doubler circuit is connected to the ground point
  • the cooking device also includes: a sampling resistor, located between one end of the voltage doubler circuit and the ground point, and the first end of the sampling resistor is connected to one end of the voltage doubler circuit, and the second end of the sampling resistor is connected to the ground point; wherein the first end of the sampling resistor is connected to the computer board for feedback of the working status of the microwave generator.
  • the setting of the sampling resistor can realize the feedback of the current working state of the microwave generator, so that the control circuit can detect the current working state of the microwave generator after obtaining the current working state of the microwave generator. If it is detected that the current working state of the microwave generator is abnormal, the power circuit is controlled to stop running, so as to reduce the probability of failure of the cooking equipment.
  • the message that the microwave generator is faulty is transmitted to the computer board through the communication circuit, so that the computer board can cut off the third switch, thereby reducing the probability of failure of the cooking equipment and improving the reliability of the operation of the cooking equipment.
  • FIG1 shows one of the topological schematic diagrams of the variable frequency drive circuit in the embodiment of the present application
  • FIG2 shows a second topological schematic diagram of the variable frequency drive circuit in an embodiment of the present application
  • FIG3 shows a third topological schematic diagram of the variable frequency drive circuit in an embodiment of the present application.
  • FIG4 shows a fourth topological schematic diagram of the variable frequency drive circuit in an embodiment of the present application.
  • FIG. 5 shows a topological diagram of a cooking device in an embodiment of the present application.
  • FIGS. 1 to 5 The corresponding relationship between the reference numerals and component names in FIGS. 1 to 5 is as follows: 102 power circuit, 104 load selection circuit, Q1 first switch element, 106 control circuit, 1022 rectifier circuit, 1024 filtering circuit, R1 first resistor, C capacitor, H reactor, 108 detection circuit, 110 driving circuit, 112 communication circuit, 114 heating element connection interface, 202 computer board, Q3 third switch element, 204 power supply circuit, 206 sampling resistor.
  • a variable frequency drive circuit is used for a cooking device, the cooking device includes at least two heating elements, and the at least two heating elements include a microwave generator, including: a power circuit 102, the power circuit 102 includes a first switch element Q1, the first switch element Q1 is used to adjust the output power of the power circuit 102, and the power circuit 102 is connected to a common connection end of the at least two heating elements; a load selection circuit 104, the load selection circuit 104 is connected to the power circuit 102, the load selection circuit 104 has at least two output ends, and the at least two output ends are used to connect to corresponding heating elements; a control circuit 106, connected to the control end of the first switch element Q1 and the load selection circuit 104, used to determine the target output power and the target heating element of the at least two heating elements according to the received control information, and control the first switch element Q1 to act according to the target power and the load selection circuit 104 to select the target heating element to power on and
  • the embodiment of the present application proposes a variable frequency drive circuit 110, which includes a power circuit 102, a load selection circuit 104 and a control circuit 106.
  • the power circuit 102 can adjust the power, and after the load selection circuit 104 is connected to the power circuit 102, the load selection circuit 104 is used to select the load.
  • the variable frequency control applied to the microwave generator is applied to other heating elements.
  • other heating elements can also achieve variable frequency control like the microwave generator, which overcomes the problem that in the related embodiments, when other heating elements other than the microwave generator are used for heating, the energy efficiency and heating performance are still relatively low and cannot meet the energy efficiency requirements at this stage.
  • different heating elements reuse the same power circuit 102. While other heating elements except the microwave generator realize variable frequency control, there is no need to add additional circuits for realizing frequency conversion, thereby reducing the cost required for realizing variable frequency control of other heating elements.
  • control information can be understood as the control instructions received by the cooking device.
  • control information can be a microwave function, 300 watts, a baking function, 1000 watts; or a steaming function, 180°C, etc.
  • the first switch element Q1 located in the power circuit 102 can be controlled by the control circuit 106 to adjust the conduction time in a unit period.
  • the longer the conduction time in a unit time the greater the output power of the power circuit 102.
  • the shorter the conduction time in a unit time the smaller the output power of the power circuit 102.
  • the power circuit 102 is a circuit for adjusting the power provided to the heating element
  • the load selection circuit 104 is used to select the heating element currently running in the cooking device. Combined use can realize frequency conversion control of different heating elements.
  • the heating element is connected to the heating element interface 114 and the load selection circuit 104 .
  • the first switch element Q1 is an insulated gate bipolar transistor (IGBT), wherein the IGBT is a composite fully controlled voltage-driven power semiconductor device composed of a bipolar junction transistor (BJT) and an insulated gate field effect transistor (MOS), and has the advantages of both the high input impedance of a metal-oxide-semiconductor field-effect transistor (MOSFET) and the low on-state voltage drop of a power transistor (Giant Transistor, GTR).
  • IGBT insulated gate bipolar transistor
  • BJT bipolar junction transistor
  • MOS insulated gate field effect transistor
  • a communication circuit 112 which is connected to the control circuit 106 and is used to receive control information and send the control information to the control circuit 106; wherein the control information is a pulse width modulation signal, and the frequency of the pulse width modulation signal corresponds one-to-one to the heating element.
  • a communication circuit 112 is provided so as to form data communication between the communication circuit 112 and the computer board 202.
  • the control information is forwarded to the control circuit 106 for the control circuit 106 to control the power circuit 102 and the load selection circuit 104, thereby realizing variable frequency drive and control of different heating elements.
  • the frequencies of the pulse width modulation signals used by different heating elements are different. Therefore, the communication circuit 112 can be used to realize the selection of different heating elements. In this process, multiple heating elements reuse the same communication circuit, which reduces the manufacturing cost of the cooking equipment.
  • the load selection circuit 104 has a first input terminal
  • the power circuit 102 also includes: a rectifier circuit 1022, having a second input terminal and a third input terminal, a first output terminal and a second output terminal, the second input terminal and the third input terminal are used to connect to the AC terminal, the first output terminal is connected to the first input terminal, the second output terminal is connected to the first terminal of the first switch element Q1, and the second terminal of the first switch element Q1 is connected to the common connection terminal.
  • the power circuit 102 includes a rectifier circuit 1022, wherein the rectifier circuit 1022 is configured to convert the AC power provided by the AC terminal into DC power.
  • the above-mentioned variable frequency drive circuit can be applied to AC power supply scenarios, thereby broadening the application scenarios of the variable frequency drive circuit 110.
  • the second output terminal of the rectifier circuit 1022 is connected to the first input terminal of the load selection circuit 104, and the second output terminal of the rectifier circuit 1022 is connected to the common connection terminal through the first switch element Q1, so that the first switch element Q1 can control the power supply of the DC power output by the rectifier circuit 1022 to the load selection circuit 104, thereby achieving Adjustment of the power input to the load selection circuit 104.
  • the load selection circuit 104 can be understood as a single-pole multi-throw switch, wherein the moving contact in the single-pole multi-throw switch is connected to the second output end of the rectifier circuit 1022, and each static contact in the single-pole multi-throw switch is connected to a heating element, so that after a moving contact in the single-pole multi-throw switch selects a static contact to connect, power is supplied to the heating element corresponding to the static contact.
  • the rectifier circuit 1022 can be understood as a rectifier.
  • the rectifier is a bridge rectifier.
  • the bridge rectifier is composed of four rectifier silicon chips connected in a bridge manner and packaged with insulating plastic.
  • a high-power bridge rectifier is encapsulated with a zinc metal shell outside the insulating layer to enhance heat dissipation.
  • the power circuit 102 also includes: a filter circuit 1024, the filter circuit 1024 includes: a first resistor R1, a first end of the first resistor R1 is connected to the first output end, and a second end of the first resistor R1 is connected to the second output end; a capacitor C, and the capacitor C is connected in parallel with the first resistor R1.
  • a filtering circuit is provided so as to utilize the filtering circuit to rectify the high-frequency voltage fluctuations in the direct current output by the circuit 1022, thereby ensuring that the filtered direct current can stably supply power to the load selection circuit 104, thereby reducing power supply fluctuations and causing abnormal operation of the heating element.
  • the characteristics of the capacitor C prevent the voltage across the capacitor from changing suddenly. Therefore, the capacitor has the characteristic of hindering the rate of change of voltage. Based on this, the filtered DC power can be smoother, thereby reducing the voltage fluctuation in the power circuit 102.
  • the power circuit 102 further includes: a reactor H located between the first end of the first resistor R1 and the first output end.
  • the reactor H is provided so as to cooperate with the filter circuit 1024 to limit the high-order harmonics in the power circuit 102 , thereby improving the power loss in the power circuit 102 .
  • the reactor H includes a coil.
  • the power circuit 102 also includes: a detection circuit 108, the input end of the detection circuit 108 is connected to the second input end and the third input end, and the output end of the detection circuit 108 is connected to the control circuit 106; wherein, when there is a surge fluctuation between the second input end and the third input end, the control circuit 106 controls the power circuit 102 to stop working.
  • the detection circuit 108 is provided so as to use the detection circuit 108 to read the magnitude of the power supply voltage entering the rectifier circuit 1022, and then when the voltage entering the rectifier circuit 1022 is too low or too high, the power circuit 102 is controlled to stop working, so as to reduce the frequency conversion drive circuit 110 caused by the abnormal power supply. Chance of damage.
  • a driving circuit 110 located between the control circuit 106 and the control end of the first switch element Q1, for driving the first switch element Q1 to operate.
  • a drive circuit 110 is set between the control circuit 106 and the first switch element Q1, so that the control circuit 106 uses the drive circuit 110 to achieve drive control of the first switch element Q1.
  • the setting of the drive circuit 110 indirectly improves the driving capability of the control circuit 106.
  • the load selection circuit includes a multi-way switch, an input end of the multi-way switch is connected to the power circuit, and at least two output ends of the multi-way switch are used to connect to corresponding heating elements.
  • the control circuit 106 selects the target heating element to operate by outputting S0 and S1.
  • the target heating element when S0 is 0 and S1 is 1, the target heating element is a microwave generator, when S0 is 1 and S1 is 0, the target heating element is a first heating element, such as a steam generator, and when S0 is 1 and S1 is 1, the target heating element is a second heating element, such as a heating tube.
  • the load selection circuit 104 includes: a relay having a moving contact and two static contacts, the moving contact being connected to the first output end, the first of the two static contacts being connected to the first heating element, and the second of the two static contacts being connected to the second heating element; a second switch element, wherein a first end of the second switch element is connected to the first power supply via a relay, and a second end of the second switch element is grounded; based on the second switch element being turned on, the relay is powered on and energized, the moving contact is connected to the first static contact, and the first heating element is powered on and operated; based on the second switch element being turned off, the relay is powered off and energized, the moving contact is connected to the second static contact, and the second heating element is powered on and operated.
  • one of the first heating element and the second heating element is a microwave generator.
  • the relay is an electrical control device, which is an electrical appliance that causes a predetermined step change in the controlled quantity in the electrical output circuit when the change of the input quantity (excitation quantity) reaches the specified requirement. It is actually an "automatic switch” that uses a small current to control the operation of a large current. Based on this, it is possible to achieve a small current to control the operation of a large current. Usually, the small current and the large current are in different circuits, so there is an isolation effect between the two, which improves the safety of the variable frequency drive circuit 110.
  • a second switch is provided so as to realize a low current by using the second switch. control.
  • the second switch element is a triode, wherein the driving control of the triode does not require the provision of a driving circuit, but is directly connected to the control circuit, thereby reducing the complexity of the overall circuit and the difficulty of design.
  • the present application provides a cooking device, comprising: at least two heating elements, at least two heating elements including microwave generators; a variable frequency drive circuit 110 such as any one of the above items, at least two heating elements are connected to the variable frequency drive circuit 110.
  • the embodiment of the present application provides a cooking device, wherein the cooking device includes the variable frequency drive circuit 110 as described above, and thus has all the beneficial technical effects of the variable frequency drive circuit 110 as described above, which will not be described in detail herein.
  • it also includes: a computer board 202; a third switch element Q3, which is connected to the computer board 202 and the power circuit 102.
  • the third switch element Q3 is turned on to supply power to the power circuit 102.
  • the computer board 202 can be understood as a control board of the cooking device, which is a component for interaction between the user and the cooking device.
  • the computer board 202 has a control panel, and the user can send control information to the variable frequency drive circuit 110 through the control panel to control the operation of the variable frequency drive circuit 110.
  • the third switch Q3 is provided so as to use the third switch Q3 to control whether to supply power to the variable frequency drive circuit 110.
  • the cooking device can control the on and off of the third switch Q3 according to actual use needs. Specifically, when the heating element of the cooking device does not need to be started, the third switch Q3 is controlled to be turned off so as to cut off the power supply to the variable frequency drive circuit 110. When the heating element of the cooking device needs to be started for heating, the third switch Q3 is controlled to be turned on so as to supply power to the variable frequency drive circuit 110. When the variable frequency drive circuit 110 is supplied with power, the power circuit 102, the load selection circuit 104, the control circuit 106, etc. in the variable frequency drive circuit 110 are powered on and operated. The provision of the third switch Q3 improves the safety of the cooking device.
  • the communication circuit 112 of the variable frequency drive circuit 110 is connected to the computer board 202 for sending control information to the communication circuit 112 .
  • the at least two heating elements further include: a steam generator and/or a heating tube.
  • possible selection schemes of the heating element are defined to satisfy the actual use of the cooking device. The use needs.
  • the microwave generator includes: a magnetron; a boost transformer, the first primary coil of the boost transformer is connected to the power circuit 102, and the first secondary coil of the boost transformer is connected to the magnetron; and a voltage doubling circuit is connected to the second secondary coil of the boost transformer and the magnetron.
  • the first secondary coil has a first connection end and a second connection end
  • the magnetron has a first connection end, a second connection end and a third connection end
  • the third connection end of the magnetron is used for grounding
  • the first connection end of the first secondary coil is connected to the first connection end of the magnetron
  • the second connection end of the first secondary coil is connected to the second connection end of the magnetron
  • the second secondary coil has a first connection end and a second connection end
  • the voltage doubler circuit includes a first connection end, a second connection end, a third connection end and a fourth connection end, wherein the first connection end of the second secondary coil is connected to the first connection end of the voltage doubler circuit, the second connection end of the second secondary coil is connected to the second connection end of the voltage doubler circuit, the fourth connection end of the voltage doubler circuit is connected to the third connection end of the magnetron, that is, the fourth connection end of the voltage doubler circuit and the third connection end of the magnetron are grounded in common, and the third
  • the voltage doubling circuit includes a first diode, a second diode, a first capacitor and a second capacitor, wherein the anode of the first diode is connected to the cathode of the second diode and the first connection end of the second secondary coil, the cathode of the first diode is connected to the first end of the first capacitor and the third connection end of the magnetron, the second end of the first capacitor is connected to the first end of the second capacitor, the second end of the second capacitor is connected to the first connection end of the first secondary coil, the anode of the second diode is connected to the first connection end of the first secondary coil, and the second connection end of the second secondary coil is connected to the second end of the first capacitor.
  • the first connection end of the magnetron, the second connection end of the magnetron and the third connection end of the magnetron are interface structures for connecting the voltage doubler circuit and the step-up transformer.
  • it further includes: a power supply circuit 204, the power supply circuit 204 is connected to the second primary coil of the step-up transformer, and the power supply circuit 204 is used to output a power supply voltage with a voltage value of a preset voltage.
  • the power supply circuit 204 is used to cooperate with the step-up transformer to output a power supply voltage of a preset voltage to power the control circuit 106, the communication circuit 112, and the load selection circuit 104.
  • the power supply circuit 204 is connected to the alternating current through AC IN.
  • the power supply circuit 204 is further connected to the first input terminal and the second input terminal of the rectifier circuit 1022. The ends are connected so that the power supply circuit 204 draws power from the first input terminal and the second input terminal of the rectifier circuit 1022 to power the control circuit 106, the communication circuit 112, and the load selection circuit 104, and after the control circuit 106, the communication circuit 112, and the load selection circuit 104 are powered on, power is drawn from the step-up transformer based on the second primary coil.
  • one end of the voltage doubling circuit is connected to the ground point
  • the cooking device also includes: a sampling resistor 206, located between one end of the voltage doubling circuit and the ground point, for connecting the first end of the sampling resistor 206 to one end of the voltage doubling circuit, and connecting the second end of the sampling resistor 206 to the ground point; wherein the first end of the sampling resistor 206 is connected to the computer board 202 for feedback of the working status of the microwave generator.
  • the setting of the sampling resistor 206 can realize the feedback of the current working state of the microwave generator, so that the control circuit 106 detects the current working state of the microwave generator after obtaining the current working state of the microwave generator. If it is detected that the current working state of the microwave generator is abnormal, the power circuit 102 is controlled to stop running, so as to reduce the probability of failure of the cooking device.
  • the message that the microwave generator is faulty is transmitted to the computer board 202 through the communication circuit 112, so that the computer board 202 can cut off the third switch element Q3, thereby reducing the probability of failure of the cooking equipment and improving the reliability of the operation of the cooking equipment.
  • the third switch element Q3 is a relay.
  • the relay on the computer board is energized to supply power to the frequency conversion integrated circuit (that is, the frequency conversion drive circuit mentioned above).
  • the computer board sends a pulse width modulation (PWM) signal to the frequency conversion integrated circuit, and the frequency range is 350Hz-2000Hz, corresponding to the input power under the microwave function.
  • PWM pulse width modulation
  • the frequency conversion integrated circuit enters the microwave function according to the signal; when the user sets the switch to the barbecue mode, the PWM signal sent by the computer board to the frequency conversion integrated circuit is 2500Hz-4500Hz, corresponding to the input power of 0W-2000W under the barbecue mode.
  • the frequency conversion integrated circuit switches to the barbecue working mode, controls the multi-way switch, and switches the load from the original switch transformer to the heating tube.
  • the detection circuit 108 in Figure 1 is connected to the control circuit 106 through SUREG and Vin, CS, PS and OC_C of the control circuit 106 are grounded through capacitors, connected to the drive circuit 110 using DRIVER, reset is achieved using RESET, connected to the communication circuit 112 through the PWM terminal, connected to the power supply circuit 204 through SYNC_P and VOP, error output is achieved using ERROR, clock and digital input and output are achieved based on DIO and CLK, Vg connects the drive circuit 110 to the first switch element Q1, wherein VDD and VSS are used as power supply connection terminals of the chip, GND indicates grounding, and the load selection circuit 104 achieves enable control through EN.
  • first and second in the specification and claims of this application may explicitly or implicitly include one or more of the features.
  • plural refers to a plurality of The meaning of is two or more.
  • and/or means at least one of the connected objects, and the character “/” generally means that the objects connected before and after are in an “or” relationship.
  • the term “multiple” refers to two or more than two.
  • the terms “upper” and “lower” indicate positions or positional relationships based on the positions or positional relationships shown in the drawings. They are only for the purpose of more conveniently describing the present application and making the description process easier, and are not intended to indicate or imply that the device or element referred to must have the specific orientation described, be constructed and operated in a specific orientation. Therefore, these descriptions cannot be understood as limitations on the present application.
  • the terms “connect”, “install”, “fix” and the like should be understood in a broad sense.
  • connection can be a fixed connection between multiple objects, or a detachable connection between multiple objects, or an integral connection; it can be a direct connection between multiple objects, or an indirect connection between multiple objects through an intermediate medium.

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  • Electromagnetism (AREA)
  • Engineering & Computer Science (AREA)
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  • Control Of High-Frequency Heating Circuits (AREA)
  • Induction Heating Cooking Devices (AREA)

Abstract

本申请提供了一种变频驱动电路和烹饪设备，变频驱动电路用于烹饪设备，烹饪设备包括至少两个加热件，至少两个加热件包括微波发生器，包括：功率回路，功率回路包括第一开关件，第一开关件用于调整功率回路的输出功率，功率回路与至少两个加热件的共用连接端连接；负载选择电路，负载选择电路与功率回路连接，负载选择电路具有至少两个输出端，至少两个输出端用于连接对应的加热件；控制电路，与第一开关件的控制端和负载选择电路连接，用于根据接收到的控制信息确定目标输出功率和至少两个加热件中的目标加热件，以及控制第一开关件按照目标功率动作、负载选择电路选择目标加热件上电运行。

Description

变频驱动电路和烹饪设备
本申请要求于2022年11月09日提交中国专利局、申请号为“202211397379.5”、名称为“变频驱动电路和烹饪设备”的中国专利申请的优先权，其全部内容通过引用结合在本申请中。
技术领域
本申请涉及驱动技术领域，具体而言，涉及一种变频驱动电路和烹饪设备。
背景技术
随着家电行业的不断发展，家用电器正朝着多功能集成一体化、高空间利用率的方向发展，如电源变换技术正在朝着高性能、高能效的变频化方向发展。
以现有的微蒸烤一体多功能厨房料理机为例，变频技术已经应用到微波发生器的控制，但是，对于其他加热方式仍没有应用变频技术，基于此，在使用其它加热方式进行加热时，烹饪设备的能效和加热性能仍然比较低，无法满足现阶段的能效需要。
申请内容
本申请旨在至少解决现有技术或相关技术中存在的技术问题之一。
为此，本申请的第一个方面在于，提供了一种变频驱动电路。
本申请的第二个方面在于，提供了一种烹饪设备。
有鉴于此，根据本申请的第一个方面，本申请提供了一种变频驱动电路用于烹饪设备，烹饪设备包括至少两个加热件，至少两个加热件包括微波发生器，包括：功率回路，功率回路包括第一开关件，第一开关件用于调整功率回路的输出功率，功率回路与至少两个加热件的共用连接端连接；负载选择电路，负载选择电路与功率回路连接，负载选择电路具有至少两个输出端，至少两个输出端用于连接对应的加热件；控制电路，与第一开关件的控制端和负载选择电路连接，用于根据接收到的控制信息确定目标输出功率和至少两个加热件中的目标加热件，以及控制第一开关件按照目标功率动作、负载选择电路选择目标加热件上电运行。
本申请的技术方案提出了一种变频驱动电路，该变频驱动电路包括功率回路、负 载选择电路和控制电路。其中，功率回路可以实现功率的调整，在将负载选择电路与功率回路连接后，利用负载选择电路实现负载的选择，基于此，将应用在微波发生器上的变频控制应用到其他的加热件上，在此过程中，其他加热件也能如果微波发生器一样，实现变频控制，克服了相关技术方案中，应用除了微波发生器之外的其它加热件进行加热时，存在的能效和加热性能仍然比较低，无法满足现阶段的能效需要的问题。
此外，本申请的上述技术方案中实现了不同的加热件复用同一个功率回路，在除了微波发生器之外的其它加热件实现了变频控制的同时，无需额外增加用于实现变频的电路，进而降低了其它加热件实现了变频控制所需的成本。
在上述技术方案中，控制信息可以理解为烹饪设备接收到的控制指令，举例来说，控制信息可以是微波功能、300瓦，烘烤功能、1000瓦；亦或蒸功能、180℃等。
在其中一个技术方案中，位于功率回路中的第一开关件能够被控制电路控制，进而调整在单位周期内导通的时长，在单位时间内导通的时长越长的情况下，功率回路的输出功率越大，反之，在单位时间内导通的时长越短的情况下，功率回路的输出功率越小。
在其中一个技术方案中，可以理解的是，功率回路是用于调整向加热件提供功率的电路，而负载选择电路用于选择烹饪设备当前运行的加热件，基于两者的配合使用，可以实现不同加热件的变频控制。
在其中一个技术方案中，第一开关件为绝缘栅双极型晶体管(Insulated Gate Bipolar Transistor，IGBT)，其中，IGBT是由(Bipolar Junction Transistor，BJT)双极型三极管和绝缘栅型场效应管(Metal Oxide Semiconductor，MOS)组成的复合全控型电压驱动式功率半导体器件,兼有(Metal-Oxide-Semiconductor Field-Effect Transistor,MOSFET)金氧半场效晶体管的高输入阻抗和电力晶体管(Giant Transistor，GTR)的低导通压降两方面的优点。
另外，本申请提出的变频驱动电路还具有以下附加技术特征。
在上述技术方案中，还包括：通信电路，通信电路与控制电路连接，用于接收控制信息，并将控制信息发送至控制电路；其中，控制信息为脉冲宽度调制信号，脉冲宽度调制信号的频率与加热件一一对应。
在该技术方案中，通过设置通信电路，以便利用通信电路与电脑板之间形成数据 通信，从而在电脑板接收到用户选定的功能和运行功率的情况下，也即接收到上文中的控制信息的情况下，将控制信息转发到控制电路，以供控制电路来控制功率回路和负载选择电路，从而实现不同加热件的变频驱动和控制。
其中，不同加热件所采用的脉冲宽度调制信号的频率不同，因此，可以利用通信电路来实现不同加热件的选择，在此过程中，多个加热件复用了同一个通信电路，降低了烹饪设备的制造成本。
负载选择电路具有第一输入端，功率回路还包括：整流电路，具有第二输入端和第三输入端、第一输出端和第二输出端，第二输入端和第三输入端用于连接交流接线端子，第一输出端与第一输入端连接，第二输出端与第一开关件的第一端连接，第一开关件的第二端与共用连接端连接。
在该技术方案中，具体限定了功率回路包括整流电路，其中，整流电路的设置能够将交流接线端子提供的交流电转化为直流电，在此情况下，上述变频驱动的电路能够应用到交流供电的场景中，因此，扩宽了变频驱动电路的应用场景。
其中，整流电路具有的第二输出端和负载选择电路的第一输入端连接，整流电路的第二输出端经过第一开关件与共用连接端连接，以便第一开关件能够控制整流电路输出的直流电向负载选择电路的供电情况，进而实现向负载选择电路输入的功率的调整。
在上述技术方案中，负载选择电路可以理解为单刀多掷开关，其中，单刀多掷开关中的动触点与整流电路的第二输出端连接，单刀多掷开关中的每一个静触点连接有一个加热件，以便在单刀多掷开关中的一个动触点选择一个静触点连接后，向静触点所对应的加热件供电。
在上述技术方案中，整流电路可以理解为整流器，在本申请的技术方案中，整流器为桥式整流器，具体地，桥式整流器是由四只整流硅芯片作桥式连接，外用绝缘塑料封装而成，大功率桥式整流器在绝缘层外添加锌金属壳包封，增强散热。
在上述任一技术方案中，功率回路还包括：滤波电路，滤波电路包括：第一电阻，第一电阻的第一端与第一输出端连接，第一电阻的第二端与第二输出端连接；电容，电容与第一电阻并联。
在该技术方案中，通过设置过滤电路，以便利用过滤电路来整流电路输出的直流电中的高频电压波动，从而确保经过滤除后的直流电能够稳定地向负载选择电路供电， 减少供电出现波动，造成加热件的工作出现异常。
具体地，电容的特性使得电容两端的电压不能突变，因此，电容具有阻碍电压变化率的特性，基于此，可以滤波后直流电更加平滑，从而降低功率回路中的电压波动。
在上述任一技术方案中，功率回路还包括：电抗器，位于第一电阻的第一端与第一输出端之间。
在该技术方案中，通过设置电抗器，以便利用电抗器与滤波电路配合使用，以便限制在功率回路中的高次谐波，从而改善功率回路上的功率损失。
在其中一个技术方案中，电抗器包括一个线圈。
在上述任一技术方案中，功率回路还包括：检测电路，检测电路的输入端与第二输入端、第三输入端连接，检测电路的输出端与控制电路连接；其中，在第二输入端和第三输入端之间存在浪涌波动，控制电路控制功率回路停止工作。
在该技术方案中，通过设置检测电路，以便利用检测电路来读取进入到整流电路中的供电电压的大小，进而在进入到整流电路中的电压过低和过高的情况下，通过控制功率回路停止工作，以便降低因供电异常造成变频驱动电路损坏的几率。
在上述任一技术方案中，还包括：驱动电路，位于控制电路与第一开关件的控制端之间，用于驱动第一开关件动作。
在上述技术方案中，第一开关件在进行驱动控制时，需要较大的电流或电压才能实现，而控制电路在实现对第一开关件的控制时，输出的电压或电流有限，很难达成第一开关件的控制，基于此，本申请的技术方案在控制电路与第一开关件之间设置了驱动电路，以便控制电路利用驱动电路来实现第一开关件的驱动控制，驱动电路的设置间接提高了控制电路的驱动能力。
在上述任一技术方案中，负载选择电路包括多路开关，多路开关的输入端与功率回路连接，多路开关的至少两个输出端用于连接对应的加热件。
在上述任一技术方案中，在与变频控制电路连接的加热件包括第一加热件和第二加热件的情况下，负载选择电路，包括：继电器，具有一个动触点和两个静触点，动触点与第一输出端连接，两个静触点中的第一个静触点与第一加热件连接，两个静触点中的第二个静触点与第二加热件连接；第二开关件，第二开关件的第一端通过继电器与第一电源连接，第二开关件的第二端接地；基于第二开关件导通，继电器上电吸合，动触点与第一静触点连通，第一加热件上电运行；基于第二开关件截止，继电器 掉电断开吸合，动触点与第二静触点连通，第二加热件上电运行。
在该技术方案中，具体给出了负载选择电路的详细拓扑结构，其中，继电器是一种电控制器件，是当输入量(激励量)的变化达到规定要求时，在电气输出电路中使被控量发生预定的阶跃变化的一种电器。它实际上是用小电流去控制大电流运作的一种“自动开关”。基于此，可以实现小电流来控制大电流运作，通常情况下，小电流与大电流之间分别处于不同的回路中，因此，两者之间存在隔离的效果，提高了变频驱动电路的使用安全。
在其中一个技术方案中，通过设置第二开关件，以便利用第二开关件来实现小电流的控制。
在上述技术方案中，第二开关件为三极管，其中，三极管的驱动控制可以无需设置驱动电路，而是与控制电路直接连接，因此，降低了整体电路的复杂度，降低了设计的难度。
根据本申请的第二个方面，本申请提供了一种烹饪设备，包括：至少两个加热件，至少两个加热件包括微波发生器；如上述中任一项的变频驱动电路，至少两个加热件与变频驱动电路连接。
本申请的技术方案提出了一种烹饪设备，其中，烹饪设备包括如上述变频驱动电路，该变频驱动电路包括功率回路、负载选择电路和控制电路。其中，功率回路可以实现功率的调整，在将负载选择电路与功率回路连接后，利用负载选择电路实现负载的选择，基于此，将应用在微波发生器上的变频控制应用到其他的加热件上，在此过程中，其他加热件也能如果微波发生器一样，实现变频控制，克服了相关技术方案中，应用除了微波发生器之外的其它加热件进行加热时，存在的能效和加热性能仍然比较低，无法满足现阶段的能效需要的问题。
此外，本申请的上述技术方案中实现了不同的加热件复用同一个功率回路，在除了微波发生器之外的其它加热件实现了变频控制的同时，无需额外增加用于实现变频的电路，进而降低了其它加热件实现了变频控制所需的成本。
在上述技术方案中，控制信息可以理解为烹饪设备接收到的控制指令，举例来说，控制信息可以是微波功能、300瓦，烘烤功能、1000瓦；亦或蒸功能、180℃等。
在其中一个技术方案中，位于功率回路中的第一开关件能够被控制电路控制，进而调整在单位周期内导通的时长，在单位时间内导通的时长越长的情况下，功率回路 的输出功率越大，反之，在单位时间内导通的时长越短的情况下，功率回路的输出功率越小。
在其中一个技术方案中，可以理解的是，功率回路是用于调整向加热件提供功率的电路，而负载选择电路用于选择烹饪设备当前运行的加热件，基于两者的配合使用，可以实现不同加热件的变频控制。
在上述技术方案中，还包括：电脑板；第三开关件，与电脑板和功率回路连接，在电脑板接收到烹饪设备的启动信号的情况下，第三开关件导通，以向功率回路供电。
在该技术方案中，电脑板可以理解为烹饪设备的控制板，其属于用户与烹饪设备之间进行交互的部件，具体地，电脑板具有控制面板，用户可以通过控制面板向变频驱动电路发送控制信息，以控制变频驱动电路运行。
在上述技术方案中，通过在设置第三开关件，以便利用第三开关件来控制是否向变频驱动电路供电，在此过程中，烹饪设备可以根据实际使用需要控制第三开关件的导通和截止。具体地，在无需启动烹饪设备的加热件工作的情况下，控制第三开关件截止，以便切断变频驱动电路的供电，而在需要启动烹饪设备的加热件进行加热的情况下，控制第三开关件导通，以便向变频驱动电路供电，在向变频驱动电路供电的情况下，变频驱动电路中的功率回路、负载选择电路、控制电路等上电运行，第三开关件的设置，提高了烹饪设备的使用安全性。
在上述技术方案中，可以避免了变频驱动电路处于持续供电，造成烹饪设备的功耗过高的问题。
在上述任一技术方案中，变频驱动电路的通信电路与电脑板连接，用于向通信电路发送控制信息。
在上述任一技术方案中，至少两个加热件还包括：蒸汽发生器和/或加热管。
在该技术方案中，限定了加热件可能的选取方案，以便满足烹饪设备在实际使用时的使用需要。
在上述任一技术方案中，微波发生器包括：磁控管；升压变压器，升压变压器的第一初级线圈与功率回路连接，升压变压器的第一次级线圈与磁控管连接；倍压电路，与升压变压器的第二次级线圈和磁控管连接。
在该技术方案中，第一次级线圈具有第一连接端和第二连接端，磁控管具有第一连接端、第二连接端和第三连接端，其中，磁控管的第三连接端用于接地，第一次级 线圈的第一连接端与磁控管的第一连接端连接，第一次级线圈的第二连接端与磁控管的第二连接端连接，第二次级线圈具有第一连接端和第二连接端，倍压电路包括第一连接端、第二连接端、第三连接端和第四连接端，其中，第二次级线圈的第一连接端与倍压电路的第一连接端连接，第二次级线圈的第二连接端与倍压电路的第二连接端连接，倍压电路的第四连接端与磁控管的第三连接端连接，也即倍压电路的第四连接端与磁控管的第三连接端共地，倍压电路的第三连接端与第一次级线圈的第一连接端连接，以便提高磁控管的第一连接端上的电压值。
在其中一个技术方案中，倍压电路包括第一二极管、第二二极管、第一电容和第二电容，其中，第一二极管的阳极与第二二极管的阴极、第二次级线圈的第一连接端连接，第一二极管的阴极与第一电容的第一端、磁控管的第三连接端连接，第一电容的第二端与第二电容的第一端连接，第二电容的第二端与第一次级线圈的第一连接端连接，第二二极管的阳极与第一次级线圈的第一连接端连接，第二次级线圈的第二连接端与第一电容的第二端连接。
在其中一个可能的设计中，磁控管的第一连接端、磁控管的第二连接端和磁控管的第三连接端为接口结构，以便倍压电路和升压变压器进行连接。
在上述任一技术方案中，还包括：供电电路，供电电路与升压变压器的第二初级线圈连接，供电电路用于输出电压值为预设电压的供电电压。在该技术方案中，通过设置供电电路，以便利用供电电路来从升压变压器上配合取点，以便输出预设电压的供电电压来为控制电路、通信电路、负载选择电路供电，在此过程中，无需单独为控制电路、通信电路、负载选择电路设置电源，有利于降低烹饪设备中设置的电源的数量，从而提高烹饪设备的设计难度。
在其中一个技术方案中，供电电路还与整流电路的第一输入端和第二输入端连接，以便供电电路从整流电路的第一输入端和第二输入端取电，为控制电路、通信电路、负载选择电路供电，并在控制电路、通信电路、负载选择电路上电运行后，基于第二初级线圈从升压变压器取电。
在上述任一技术方案中，倍压电路的一端与接地点连接，烹饪设备还包括：采样电阻，位于倍压电路的一端与接地点之间，用于采样电阻的第一端与倍压电路的一端连接，采样电阻的第二端与接地点连接；其中，采样电阻的第一端与电脑板连接，用于反馈微波发生器的工作状态。
在该技术方案中，采样电阻的设置，可以实现微波发生器当前的工作状态的反馈，以便控制电路在获取得到微波发生器当前的工作状态后，对微波发生器的当前工作状态进行检测，若检测到微波发生器当前的工作状态为异常的情况下，控制功率回路停止运行，以便降烹饪设备出现故障的几率。
此外，若检测到微波发生器当前的工作状态为异常的情况下，通过通信电路，将微波发生器存在故障的消息传递至电脑板，以供电脑板切断第三开关件，从而降低烹饪设备出现故障的几率，提高了烹饪设备运行的可靠性。
本申请的附加方面和优点将在下面的描述中部分给出，部分将从下面的描述中变得明显，或通过本申请的实践了解到。
附图说明
本申请的上述和/或附加的方面和优点从结合下面附图对实施例的描述中将变得明显和容易理解，其中：
图1示出了本申请实施例中的变频驱动电路的拓扑示意图之一；
图2示出了本申请实施例中的变频驱动电路的拓扑示意图之二；
图3示出了本申请实施例中的变频驱动电路的拓扑示意图之三；
图4示出了本申请实施例中的变频驱动电路的拓扑示意图之四；
图5示出了本申请实施例中的烹饪设备的拓扑示意图。
其中，图1至图5中的附图标记与部件名称之间的对应关系为：
102功率回路，104负载选择电路，Q1第一开关件，106控制电路，1022整流电路，
1024滤波电路，R1第一电阻，C电容，H电抗器，108检测电路，110驱动电路，112通信电路，114加热件连接接口，202电脑板，Q3第三开关件，204供电电路，206采样电阻。
具体实施方式
为了能够更清楚地理解本申请的上述方面、特征和优点，下面结合附图和具体实施方式对本申请进行进一步的详细描述。需要说明的是，在不冲突的情况下，本申请的实施例及实施例中的特征可以相互组合。
在下面的描述中阐述了很多具体细节以便于充分理解本申请，但是，本申请还可 以采用其他不同于在此描述的其他方式来实施，因此，本申请的保护范围并不受下面公开的具体实施例的限制。
如图1、图2、图3、图4和图5所示，根据本申请的一种变频驱动电路，用于烹饪设备，烹饪设备包括至少两个加热件，至少两个加热件包括微波发生器，包括：功率回路102，功率回路102包括第一开关件Q1，第一开关件Q1用于调整功率回路102的输出功率，功率回路102与至少两个加热件的共用连接端连接；负载选择电路104，负载选择电路104与功率回路102连接，负载选择电路104具有至少两个输出端，至少两个输出端用于连接对应的加热件；控制电路106，与第一开关件Q1的控制端和负载选择电路104连接，用于根据接收到的控制信息确定目标输出功率和至少两个加热件中的目标加热件，以及控制第一开关件Q1按照目标功率动作、负载选择电路104选择目标加热件上电运行。
本申请的实施例提出了一种变频驱动电路110，该变频驱动电路110包括功率回路102、负载选择电路104和控制电路106。其中，功率回路102可以实现功率的调整，在将负载选择电路104与功率回路102连接后，利用负载选择电路104实现负载的选择，基于此，将应用在微波发生器上的变频控制应用到其他的加热件上，在此过程中，其他加热件也能如果微波发生器一样，实现变频控制，克服了相关实施例中，应用除了微波发生器之外的其它加热件进行加热时，存在的能效和加热性能仍然比较低，无法满足现阶段的能效需要的问题。
此外，本申请的上述实施例中实现了不同的加热件复用同一个功率回路102，在除了微波发生器之外的其它加热件实现了变频控制的同时，无需额外增加用于实现变频的电路，进而降低了其它加热件实现了变频控制所需的成本。
在上述实施例中，控制信息可以理解为烹饪设备接收到的控制指令，举例来说，控制信息可以是微波功能、300瓦，烘烤功能、1000瓦；亦或蒸功能、180℃等。
在其中一个实施例中，位于功率回路102中的第一开关件Q1能够被控制电路106控制，进而调整在单位周期内导通的时长，在单位时间内导通的时长越长的情况下，功率回路102的输出功率越大，反之，在单位时间内导通的时长越短的情况下，功率回路102的输出功率越小。
在其中一个实施例中，可以理解的是，功率回路102是用于调整向加热件提供功率的电路，而负载选择电路104用于选择烹饪设备当前运行的加热件，基于两者的配 合使用，可以实现不同加热件的变频控制。
在其中一个实施例中，加热件采用加热件连接接口114与负载选择电路104。
在其中一个实施例中，第一开关件Q1为绝缘栅双极型晶体管(Insulated Gate Bipolar Transistor，IGBT)，其中，IGBT是由(Bipolar Junction Transistor，BJT)双极型三极管和绝缘栅型场效应管(Metal Oxide Semiconductor，MOS)组成的复合全控型电压驱动式功率半导体器件,兼有(Metal-Oxide-Semiconductor Field-Effect Transistor,MOSFET)金氧半场效晶体管的高输入阻抗和电力晶体管(Giant Transistor，GTR)的低导通压降两方面的优点。
在本申请的一些实施例中，还包括：通信电路112，通信电路112与控制电路106连接，用于接收控制信息，并将控制信息发送至控制电路106；其中，控制信息为脉冲宽度调制信号，脉冲宽度调制信号的频率与加热件一一对应。
在该技术方案中，通过设置通信电路112，以便利用通信电路112与电脑板202之间形成数据通信，从而在电脑板202接收到用户选定的功能和运行功率的情况下，也即接收到上文中的控制信息的情况下，将控制信息转发到控制电路106，以供控制电路106来控制功率回路102和负载选择电路104，从而实现不同加热件的变频驱动和控制。
其中，不同加热件所采用的脉冲宽度调制信号的频率不同，因此，可以利用通信电路112来实现不同加热件的选择，在此过程中，多个加热件复用了同一个通信电路，降低了烹饪设备的制造成本。
在上述实施例中，负载选择电路104具有第一输入端，功率回路102还包括：整流电路1022，具有第二输入端和第三输入端、第一输出端和第二输出端，第二输入端和第三输入端用于连接交流接线端子，第一输出端与第一输入端连接，第二输出端与第一开关件Q1的第一端连接，第一开关件Q1的第二端与共用连接端连接。
在该实施例中，具体限定了功率回路102包括整流电路1022，其中，整流电路1022的设置能够将交流接线端子提供的交流电转化为直流电，在此情况下，上述变频驱动的电路能够应用到交流供电的场景中，因此，扩宽了变频驱动电路110的应用场景。
其中，整流电路1022具有的第二输出端和负载选择电路104的第一输入端连接，整流电路1022的第二输出端经过第一开关件Q1与共用连接端连接，以便第一开关件Q1能够控制整流电路1022输出的直流电向负载选择电路104的供电情况，进而实现 向负载选择电路104输入的功率的调整。
在上述实施例中，负载选择电路104可以理解为单刀多掷开关，其中，单刀多掷开关中的动触点与整流电路1022的第二输出端连接，单刀多掷开关中的每一个静触点连接有一个加热件，以便在单刀多掷开关中的一个动触点选择一个静触点连接后，向静触点所对应的加热件供电。
在上述实施例中，整流电路1022可以理解为整流器，在本申请的实施例中，整流器为桥式整流器，具体地，桥式整流器是由四只整流硅芯片作桥式连接，外用绝缘塑料封装而成，大功率桥式整流器在绝缘层外添加锌金属壳包封，增强散热。
在上述任一实施例中，功率回路102还包括：滤波电路1024，滤波电路1024包括：第一电阻R1，第一电阻R1的第一端与第一输出端连接，第一电阻R1的第二端与第二输出端连接；电容C，电容C与第一电阻R1并联。
在该实施例中，通过设置过滤电路，以便利用过滤电路来整流电路1022输出的直流电中的高频电压波动，从而确保经过滤除后的直流电能够稳定地向负载选择电路104供电，减少供电出现波动，造成加热件的工作出现异常。
具体地，电容C的特性使得电容两端的电压不能突变，因此，电容具有阻碍电压变化率的特性，基于此，可以滤波后直流电更加平滑，从而降低功率回路102中的电压波动。
在上述任一实施例中，功率回路102还包括：电抗器H，位于第一电阻R1的第一端与第一输出端之间。
在该实施例中，通过设置电抗器H，以便利用电抗器H与滤波电路1024配合使用，以便限制在功率回路102中的高次谐波，从而改善功率回路102上的功率损失。
在其中一个实施例中，电抗器H包括一个线圈。
在上述任一实施例中，功率回路102还包括：检测电路108，检测电路108的输入端与第二输入端、第三输入端连接，检测电路108的输出端与控制电路106连接；其中，在第二输入端和第三输入端之间存在浪涌波动，控制电路106控制功率回路102停止工作。
在该实施例中，通过设置检测电路108，以便利用检测电路108来读取进入到整流电路1022中的供电电压的大小，进而在进入到整流电路1022中的电压过低和过高的情况下，通过控制功率回路102停止工作，以便降低因供电异常造成变频驱动电路110 损坏的几率。
在上述任一实施例中，还包括：驱动电路110，位于控制电路106与第一开关件Q1的控制端之间，用于驱动第一开关件Q1动作。
在上述实施例中，第一开关件Q1在进行驱动控制时，需要较大的电流或电压才能实现，而控制电路106在实现对第一开关件Q1的控制时，输出的电压或电流有限，很难达成第一开关件Q1的控制，基于此，本申请的实施例在控制电路106与第一开关件Q1之间设置了驱动电路110，以便控制电路106利用驱动电路110来实现第一开关件Q1的驱动控制，驱动电路110的设置间接提高了控制电路106的驱动能力。
在上述任一实施例中，负载选择电路包括多路开关，多路开关的输入端与功率回路连接，多路开关的至少两个输出端用于连接对应的加热件。
其中，控制电路106通过输出S0和S1来选择目标加热件工作。
具体地，举例来说，在S0为0、S1为1的情况下，目标加热件为微波发生器，在S0为1、S1为0的情况下，目标加热件为第一加热件，如蒸汽发生器，在S0为1、S1为1的情况下，目标加热件为第二加热件，如加热管。
在上述任一实施例中，在与变频控制电路106连接的加热件包括第一加热件和第二加热件的情况下，负载选择电路104，包括：继电器，具有一个动触点和两个静触点，动触点与第一输出端连接，两个静触点中的第一个静触点与第一加热件连接，两个静触点中的第二个静触点与第二加热件连接；第二开关件，第二开关件的第一端通过继电器relay与第一电源连接，第二开关件的第二端接地；基于第二开关件导通，继电器上电吸合，动触点与第一静触点连通，第一加热件上电运行；基于第二开关件截止，继电器掉电断开吸合，动触点与第二静触点连通，第二加热件上电运行。
其中，第一加热件和第二加热件中的一个为微波发生器。
在该实施例中，具体给出了负载选择电路104的详细拓扑结构，其中，继电器是一种电控制器件，是当输入量(激励量)的变化达到规定要求时，在电气输出电路中使被控量发生预定的阶跃变化的一种电器。它实际上是用小电流去控制大电流运作的一种“自动开关”。基于此，可以实现小电流来控制大电流运作，通常情况下，小电流与大电流之间分别处于不同的回路中，因此，两者之间存在隔离的效果，提高了变频驱动电路110的使用安全。
在其中一个实施例中，通过设置第二开关件，以便利用第二开关件来实现小电流 的控制。
在上述实施例中，第二开关件为三极管，其中，三极管的驱动控制可以无需设置驱动电路，而是与控制电路直接连接，因此，降低了整体电路的复杂度，降低了设计的难度。
在其中一个实施例，本申请提供了一种烹饪设备，包括：至少两个加热件，至少两个加热件包括微波发生器；如上述中任一项的变频驱动电路110，至少两个加热件与变频驱动电路110连接。
本申请的实施例提出了一种烹饪设备，其中，烹饪设备包括如上述变频驱动电路110，故具有上述变频驱动电路110的全部有益技术效果，在此不再赘述。
在上述实施例中，还包括：电脑板202；第三开关件Q3，与电脑板202和功率回路102连接，在电脑板202接收到烹饪设备的启动信号的情况下，第三开关件Q3导通，以向功率回路102供电。
在该实施例中，电脑板202可以理解为烹饪设备的控制板，其属于用户与烹饪设备之间进行交互的部件，具体地，电脑板202具有控制面板，用户可以通过控制面板向变频驱动电路110发送控制信息，以控制变频驱动电路110运行。
在上述实施例中，通过在设置第三开关件Q3，以便利用第三开关件Q3来控制是否向变频驱动电路110供电，在此过程中，烹饪设备可以根据实际使用需要控制第三开关件Q3的导通和截止。具体地，在无需启动烹饪设备的加热件工作的情况下，控制第三开关件Q3截止，以便切断变频驱动电路110的供电，而在需要启动烹饪设备的加热件进行加热的情况下，控制第三开关件Q3导通，以便向变频驱动电路110供电，在向变频驱动电路110供电的情况下，变频驱动电路110中的功率回路102、负载选择电路104、控制电路106等上电运行，第三开关件Q3的设置，提高了烹饪设备的使用安全性。
在上述实施例中，可以避免了变频驱动电路110处于持续供电，造成烹饪设备的功耗过高的问题。
在上述任一实施例中，变频驱动电路110的通信电路112与电脑板202连接，用于向通信电路112发送控制信息。
在上述任一实施例中，至少两个加热件还包括：蒸汽发生器和/或加热管。
在该实施例中，限定了加热件可能的选取方案，以便满足烹饪设备在实际使用时 的使用需要。
在上述任一实施例中，微波发生器包括：磁控管；升压变压器，升压变压器的第一初级线圈与功率回路102连接，升压变压器的第一次级线圈与磁控管连接；倍压电路，与升压变压器的第二次级线圈和磁控管连接。
在该实施例中，第一次级线圈具有第一连接端和第二连接端，磁控管具有第一连接端、第二连接端和第三连接端，其中，磁控管的第三连接端用于接地，第一次级线圈的第一连接端与磁控管的第一连接端连接，第一次级线圈的第二连接端与磁控管的第二连接端连接，第二次级线圈具有第一连接端和第二连接端，倍压电路包括第一连接端、第二连接端、第三连接端和第四连接端，其中，第二次级线圈的第一连接端与倍压电路的第一连接端连接，第二次级线圈的第二连接端与倍压电路的第二连接端连接，倍压电路的第四连接端与磁控管的第三连接端连接，也即倍压电路的第四连接端与磁控管的第三连接端共地，倍压电路的第三连接端与第一次级线圈的第一连接端连接，以便提高磁控管的第一连接端上的电压值。
在其中一个实施例中，倍压电路包括第一二极管、第二二极管、第一电容和第二电容，其中，第一二极管的阳极与第二二极管的阴极、第二次级线圈的第一连接端连接，第一二极管的阴极与第一电容的第一端、磁控管的第三连接端连接，第一电容的第二端与第二电容的第一端连接，第二电容的第二端与第一次级线圈的第一连接端连接，第二二极管的阳极与第一次级线圈的第一连接端连接，第二次级线圈的第二连接端与第一电容的第二端连接。
在其中一个可能的设计中，磁控管的第一连接端、磁控管的第二连接端和磁控管的第三连接端为接口结构，以便倍压电路和升压变压器进行连接。
在上述任一实施例中，还包括：供电电路204，供电电路204与升压变压器的第二初级线圈连接，供电电路204用于输出电压值为预设电压的供电电压。
在该实施例中，通过设置供电电路204，以便利用供电电路204来从升压变压器上配合取点，以便输出预设电压的供电电压来为控制电路106、通信电路112、负载选择电路104供电，在此过程中，无需单独为控制电路106、通信电路112、负载选择电路104设置电源，有利于降低烹饪设备中设置的电源的数量，从而提高烹饪设备的设计难度。示例性地，供电电路204通过AC IN连接到交流电。
在其中一个实施例中，供电电路204还与整流电路1022的第一输入端和第二输入 端连接，以便供电电路204从整流电路1022的第一输入端和第二输入端取电，为控制电路106、通信电路112、负载选择电路104供电，并在控制电路106、通信电路112、负载选择电路104上电运行后，基于第二初级线圈从升压变压器取电。
在上述任一实施例中，倍压电路的一端与接地点连接，烹饪设备还包括：采样电阻206，位于倍压电路的一端与接地点之间，用于采样电阻206的第一端与倍压电路的一端连接，采样电阻206的第二端与接地点连接；其中，采样电阻206的第一端与电脑板202连接，用于反馈微波发生器的工作状态。
在该实施例中，采样电阻206的设置，可以实现微波发生器当前的工作状态的反馈，以便控制电路106在获取得到微波发生器当前的工作状态后，对微波发生器的当前工作状态进行检测，若检测到微波发生器当前的工作状态为异常的情况下，控制功率回路102停止运行，以便降烹饪设备出现故障的几率。
此外，若检测到微波发生器当前的工作状态为异常的情况下，通过通信电路112，将微波发生器存在故障的消息传递至电脑板202，以供电脑板202切断第三开关件Q3，从而降低烹饪设备出现故障的几率，提高了烹饪设备运行的可靠性。
在其中一个实施例中，第三开关件Q3为继电器，当用户设置微波功能时，此时电脑板上继电器吸合给变频一体化电路(也即上文中的变频驱动电路)供电，电脑板给变频一体化电路发送脉冲宽度调制(Pulse width modulation，PWM)信号，频率范围为350Hz-2000Hz，对应微波功能下的输入功率，此时变频一体化电路根据信号进入微波功能；当用户设置切换为烧烤模式时，电脑板给变频一体化电路发送的PWM信号为2500Hz-4500Hz，对应烧烤模式下的0W-2000W的输入功率，变频一体化电路切换到烧烤工作模式，控制多路开关，将负载从原有的开关变压器切换发热管。
具体地，图1中的检测电路108通过SUREG和Vin与控制电路106连接，控制电路106的CS、PS以及OC_C通过电容接地，利用DRIVER与驱动电路110连接，利用RESET来实现复位，通过PWM端脚与通信电路112连接，通过SYNC_P和VOP与供电电路204连接，利用ERROR输出错误，基于DIO和CLK来实现时钟和数字输入输出，Vg将驱动电路110与第一开关件Q1连接，其中，VDD、VSS来作为芯片的供电连接端，GND示意接地，负载选择电路104通过EN来实现使能控制。
本申请的说明书和权利要求书中的术语“第一”、“第二”的特征可以明示或者隐含地包括一个或者更多个该特征。在本申请的文字描述中，除非另有说明，“多个” 的含义是两个或两个以上。另外，说明书以及权利要求中“和/或”表示所连接对象的至少其中之一，字符“/”，一般表示前后关联对象是一种“或”的关系。
在本申请的文字描述中，可以理解的是，除有明确的规定和限定之外，术语“安装”、“相连”、“连接”应做广义理解，举例来说，可以是固定地连接，也可以是可拆卸地连接，或一体地连接；可以是机械结构连接，也可以是电气连接；可以是两者直接相连，也可以是两者通过中间媒介间接相连，可以是两个元件内部的连通。对于本领域的一般技术人员而言，可以具体情况理解上述术语在本申请中的具体含义。
在本申请的权利要求书、说明书和说明书附图中，术语“多个”则指两个或两个以上，除非有额外的明确限定，术语“上”、“下”等指示的方位或位置关系为基于附图所示的方位或位置关系，仅是为了更方便地描述本申请和使得描述过程更加简便，而不是为了指示或暗示所指的装置或元件必须具有所描述的特定方位、以特定方位构造和操作，因此这些描述不能理解为对本申请的限制；术语“连接”、“安装”、“固定”等均应做广义理解，举例来说，“连接”可以是多个对象之间的固定连接，也可以是多个对象之间的可拆卸连接，或一体地连接；可以是多个对象之间的直接相连，也可以是多个对象之间的通过中间媒介间接相连。对于本领域的一般技术人员而言，可以根据上述数据地具体情况理解上述术语在本申请中的具体含义。
在本申请的权利要求书、说明书和说明书附图中，术语“一个实施例”、“一些实施例”、“具体实施例”等的描述意指结合该实施例或示例描述的具体特征、结构、材料或特点包含于本申请的至少一个实施例或示例中。在本申请的权利要求书、说明书和说明书附图中，对上述术语的示意性表述不一定指的是相同的实施例或实例。而且，描述的具体特征、结构、材料或特点可以在任何的一个或多个实施例或示例中以合适的方式结合。
以上仅为本申请的优选实施例而已，并不用于限制本申请，对于本领域的技术人员来说，本申请可以有各种更改和变化。凡在本申请的精神和原则之内，所作的任何修改、等同替换、改进等，均应包含在本申请的保护范围之内。

Claims (15)

  1. 一种变频驱动电路，用于烹饪设备，其中，所述烹饪设备包括至少两个加热件，至少两个所述加热件包括微波发生器，包括：
    功率回路，所述功率回路包括第一开关件，所述第一开关件用于调整所述功率回路的输出功率，所述功率回路与至少两个所述加热件的共用连接端连接；
    负载选择电路，所述负载选择电路与所述功率回路连接，所述负载选择电路具有至少两个输出端，至少两个所述输出端用于连接对应的加热件；
    控制电路，与所述第一开关件的控制端和所述负载选择电路连接，用于根据接收到的控制信息确定目标输出功率和至少两个所述加热件中的目标加热件，以及控制所述第一开关件按照所述目标功率动作、所述负载选择电路选择所述目标加热件上电运行。
  2. 根据权利要求1所述的变频驱动电路，其中，还包括：
    通信电路，所述通信电路与所述控制电路连接，用于接收所述控制信息，并将所述控制信息发送至所述控制电路；
    其中，所述控制信息为脉冲宽度调制信号，所述脉冲宽度调制信号的频率与加热件一一对应。
  3. 根据权利要求1或2所述的变频驱动电路，其中，所述负载选择电路具有第一输入端，所述功率回路还包括：
    整流电路，具有第二输入端和第三输入端、第一输出端和第二输出端，所述第二输入端和第三输入端用于连接交流接线端子，所述第一输出端与所述第一输入端连接，所述第二输出端与所述第一开关件的第一端连接，所述第一开关件的第二端与所述共用连接端连接。
  4. 根据权利要求3所述的变频驱动电路，其中，所述功率回路还包括：滤波电路，所述滤波电路包括：
    第一电阻，所述第一电阻的第一端与所述第一输出端连接，所述第一电阻的第二端与所述第二输出端连接；
    电容，所述电容与所述第一电阻并联。
  5. 根据权利要求4所述的变频驱动电路，其中，所述功率回路还包括：电抗器， 位于所述第一电阻的第一端与所述第一输出端之间。
  6. 根据权利要求3所述的变频驱动电路，其中，所述功率回路还包括：
    检测电路，所述检测电路的输入端与所述第二输入端和所述第三输入端连接，所述检测电路的输出端与所述控制电路连接；
    其中，在所述第二输入端和所述第三输入端之间存在浪涌波动，所述控制电路控制所述功率回路停止工作。
  7. 根据权利要求3所述的变频驱动电路，其中，还包括：
    驱动电路，位于所述控制电路与所述第一开关件的控制端之间，用于驱动所述第一开关件动作。
  8. 根据权利要求7所述的变频驱动电路，其中，所述负载选择电路包括多路开关，所述多路开关的输入端与所述功率回路连接，所述多路开关的至少两个输出端用于连接对应的加热件。
  9. 一种烹饪设备，其中，包括：
    至少两个加热件，至少两个所述加热件包括微波发生器；
    如权利要求1至8中任一项所述的变频驱动电路，至少两个所述加热件与所述变频驱动电路连接。
  10. 根据权利要求9所述的烹饪设备，其中，还包括：
    电脑板；
    第三开关件，与所述电脑板和所述功率回路连接，在所述电脑板接收到所述烹饪设备的启动信号的情况下，所述第三开关件导通，以向所述功率回路供电。
  11. 根据权利要求10所述的烹饪设备，其中，所述变频驱动电路的通信电路与所述电脑板连接，用于向所述通信电路发送所述控制信息。
  12. 根据权利要求10所述的烹饪设备，其中，至少两个所述加热件还包括：
    蒸汽发生器和/或加热管。
  13. 根据权利要求10至12中任一项所述的烹饪设备，其中，所述微波发生器包括：
    磁控管；
    升压变压器，所述升压变压器的第一初级线圈与所述功率回路连接，所述升压变压器的第一次级线圈与所述磁控管连接；
    倍压电路，与所述升压变压器的第二次级线圈和所述磁控管连接。
  14. 根据权利要求13所述的烹饪设备，其中，还包括：
    供电电路，所述供电电路与所述升压变压器的第二初级线圈连接，所述供电电路用于输出电压值为预设电压的供电电压。
  15. 根据权利要求13所述的烹饪设备，其中，所述倍压电路的一端与接地点连接，所述烹饪设备还包括：
    采样电阻，位于所述倍压电路的一端与所述接地点之间，用于采样电阻的第一端与所述倍压电路的一端连接，所述采样电阻的第二端与所述接地点连接；
    其中，所述采样电阻的第一端与所述电脑板连接，用于反馈所述微波发生器的工作状态。
PCT/CN2023/129866 2022-11-09 2023-11-06 变频驱动电路和烹饪设备 Ceased WO2024099254A1 (zh)

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