EP3123816B1 - Dispositif pour appareil de cuisson avec unité de pontage à commande automatique - Google Patents

Dispositif pour appareil de cuisson avec unité de pontage à commande automatique Download PDF

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Publication number
EP3123816B1
EP3123816B1 EP15715445.1A EP15715445A EP3123816B1 EP 3123816 B1 EP3123816 B1 EP 3123816B1 EP 15715445 A EP15715445 A EP 15715445A EP 3123816 B1 EP3123816 B1 EP 3123816B1
Authority
EP
European Patent Office
Prior art keywords
unit
cooking appliance
bridging
switch
control
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.)
Active
Application number
EP15715445.1A
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German (de)
English (en)
Other versions
EP3123816A1 (fr
Inventor
Nicolas Blasco Rueda
Alvaro Cortes Blanco
Oscar GARCIA-IZQUIERDOGANGO
Pablo Jesus Hernandez Blasco
Diego Puyal Puente
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.)
BSH Hausgeraete GmbH
Original Assignee
BSH Hausgeraete GmbH
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Publication of EP3123816A1 publication Critical patent/EP3123816A1/fr
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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
    • H05B6/02—Induction heating
    • H05B6/10—Induction heating apparatus, other than furnaces, for specific applications
    • H05B6/12—Cooking devices
    • H05B6/1209—Cooking devices induction cooking plates or the like and devices to be used in combination with them
    • 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
    • H05B1/0266—Cooktops
    • 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
    • H05B6/02—Induction heating
    • H05B6/06—Control, e.g. of temperature, of power
    • H05B6/062—Control, e.g. of temperature, of power for cooking plates or the like

Definitions

  • the invention is based on a cooking device device according to the preamble of claim 1.
  • Cooking hobs are known from the prior art, which comprise a relay and a driver circuit which is provided for driving the relay, wherein the driver circuit comprises a surge protection circuit comprising a freewheeling diode and a zener diode, and a switch bridging the zener diode. Furthermore, a control unit is provided to control the switch in at least one operating state directly by a control signal in order to bridge the Zener diode.
  • a hob is known with at least one inductor, at least one inverter, a switching device and a detection circuit for detecting cookware, wherein the switching device is arranged in a circuit between the inductor and the inverter, so that the switching device in a first switching position a connection between the inverter and the inductor and breaks the connection between the inverter and the inductor in at least a second switching position.
  • the switching device is connected to the detection circuit in such a way that the switching device in the at least one second switching position connects the inductor to the detection circuit.
  • the international patent application WO 2012/063159 A1 discloses a heating device, in particular a cooktop heating device, with at least one heating connection for at least one heating element and at least one frequency unit.
  • the heater includes a protection unit configured to detect existence of a conduction path between the frequency unit and the heater terminal.
  • a Kochmuldenvorraum in particular a Indu Vietnameseskochmuldenvorraum, with at least one switching unit, by means of which at least one power supply line can be interrupted and produced, through which at least one operating operation generates a current generated by means of a power supply voltage and which leads to a first switching element, and with at least one control device which controls the switching unit in such a way in the operating process, in that the switching unit interrupts the power supply line during at least a first entire time interval, and which causes the power supply to be established immediately before and immediately after the first time interval, and which causes a switching of the first switching element that starts during the first time interval and ends.
  • the first time interval is less than half the period of the mains voltage.
  • the object of the invention is in particular to provide a generic Garellavorraum with improved properties in terms of efficiency and / or a control.
  • the object is solved by the characterizing features of claim 1, while advantageous embodiments and further developments of the invention can be taken from the dependent claims.
  • the invention is based on a cooking device device, in particular a cooktop device, preferably an induction cooktop device, with at least one mechanical switch, at least one driver circuit, which is provided for driving the at least one mechanical switch and which comprises a protection unit and a bridging unit, which in at least one Operating state is provided to the protection unit at least partially, in particular at least one, preferably discrete, component of the protection unit to bridge.
  • a cooking device device in particular a cooktop device, preferably an induction cooktop device, with at least one mechanical switch, at least one driver circuit, which is provided for driving the at least one mechanical switch and which comprises a protection unit and a bridging unit, which in at least one Operating state is provided to the protection unit at least partially, in particular at least one, preferably discrete, component of the protection unit to bridge.
  • the bridging unit is designed to be self-controlling.
  • a "cooking appliance device” is to be understood in particular as meaning at least one part, in particular a sub-assembly, of a cooking appliance, in particular a cooktop and preferably an induction cooktop.
  • the cooking appliance device may also comprise the entire cooking appliance, in particular the entire hob and preferably the entire induction hob.
  • the cooking appliance device comprises at least one inverter and at least one inductor, which is provided to be supplied by the at least one inverter with a high-frequency heating current.
  • the high-frequency heating current is provided in particular for heating, in particular cooking utensils, in particular by eddy current and / or magnetic reversal effects.
  • the cooking appliance device has a control unit.
  • the at least one mechanical switch is designed, in particular, as a contactor and / or preferably as a relay, and comprises in particular at least one drive coil and at least one armature element which is movable, in particular, by means of a magnetic field generated by the at least one driver coil.
  • the at least one mechanical switch can be used as a power switch, in particular SPST switch, DPST switch, SPCO switch and / or SPTT switch, and / or as a changeover switch, in particular SPDT switch, DPDT switch and / or DPCO switch be trained.
  • the at least one mechanical switch is preferably arranged between the at least one inverter and the at least one inductor and, in particular in at least one operating state, intended to interrupt and / or produce at least one conduction path between the at least one inverter and the at least one inductor.
  • a "conduction path" should be understood to mean in particular an electrically conductive connection between at least two points.
  • a "driver circuit” is to be understood in particular as a circuit which is provided to provide at least one switching current and / or at least one switching voltage for the at least one mechanical switch, in particular the at least one driver coil of the at least one mechanical switch.
  • the at least one driver circuit may only discrete components and in particular is free of ICs.
  • a "protective unit” is to be understood in particular as a unit and / or a circuit which is provided for at least one component, in particular of the at least one driver circuit, in particular in at least one fault operating state and / or in at least one switching state, in particular in at least one a shutdown of the at least one mechanical switch, in particular against an overcurrent and / or preferably to protect against overvoltage.
  • the protection unit may include at least one switch, at least one resistor, preferably a temperature-dependent resistor, in particular an NTC resistor and / or a PTC resistor, at least one fuse, at least one bimetallic element, at least one RC element, in particular a snubber element and or a sacredrot member, at least one varistor and / or preferably at least one diode.
  • the protection unit is provided to survive at least one switching operation, preferably each switching operation, of the at least one mechanical switch without damage.
  • a "switching operation” should be understood to mean, in particular, a process in which the at least one armature element of the at least one mechanical switch undergoes a movement and in which the at least one mechanical switch in particular changes its switch state.
  • the at least one mechanical switch is in a non-conductive and / or bouncing state during the at least one switching operation.
  • the at least one switching operation may comprise releasing at least one electrically conductive connection, which the switch has in at least one operating state, and / or one, in particular complete, producing at least one, in particular further, electrically conductive connection.
  • a "switching state” is to be understood as meaning, in particular, a state of the at least one mechanical switch and / or at least one control signal of the at least one mechanical switch, in particular at least one idle state, at least one on state, at least one hold state, and / or at least one turn off state.
  • the at least one idle state is defined in particular by a normal state, in particular an NC (normally closed) state and / or a NO (normally open) state.
  • the at least one switch-on state comprises, in particular, at least one supply of a voltage and / or a current for the at least one driver coil and / or supplying the at least one driver coil with energy, in particular with one Voltage and / or current, and / or at least one, preferably exactly one, switching operation, which preferably converts the at least one mechanical switch from a normal operating state to a working mode, in particular, the at least one anchor element of a normally closed contact merges into a normally open contact.
  • the at least one holding state comprises in particular a holding of the at least one mechanical switch, in particular of the at least one anchor element, preferably in the working operating state.
  • the at least one switch-off state comprises in particular at least one, preferably exactly one, switching operation, which preferably converts the at least one mechanical switch from a working operating state into a normal operating state, wherein in particular the at least one armature element transitions from a normally open contact into a normally closed contact, and / or at least one Dismantling an energy stored in the at least one drive coil, in particular a current and / or a voltage.
  • a "bridging unit” should be understood to mean, in particular, a unit and / or a circuit which is provided to bypass an object, in particular at least one, preferably discrete, component by means of an electrical connection.
  • the bridging unit in at least one operating state, provides at least one low-impedance conduction path, at least one low-resistance component and / or at least one component which is provided in at least one operating state to assume a low-resistance state.
  • the bridging unit can have at least one, preferably voltage-controlled, bypass switch, in particular a thyristor and / or a transistor, in particular a bipolar transistor and / or a MOSFET, which can be connected in parallel to the object.
  • the at least one bypass switch is designed as a unipolar switch and / or unidirectional switch.
  • the at least one bypass switch may also be bidirectional.
  • the expression "low resistance” should be understood as meaning, in particular, an electrical resistance of at most 10 ⁇ , advantageously of not more than 5 ⁇ , preferably of not more than 100 m ⁇ and particularly preferably of not more than 10 m ⁇ .
  • the fact that the at least one bridging unit is designed to be "self-controlling" is to be understood in particular to mean that the at least one bridging unit automatically and automatically, in particular depends on, at least one operating state a, in particular momentary, voltage value and / or current value of the at least one driver circuit changes.
  • the at least one bridging unit is free from a, in particular direct, connection to the control unit.
  • the bridging unit has at least two, preferably exactly two, bridging connections and at least one, preferably exactly one, control connection.
  • a "bridging connection” is to be understood as meaning, in particular, a connection, in particular an input and / or output, of the bridging unit, which is connected to at least one connection of at least one object to be bridged.
  • the at least two bridging connections are connected to one another in a low-resistance manner, at least in an operating state, in particular a bridging state.
  • the at least two bridging connections are connected to each other in a high-impedance manner, at least in a further operating state, in particular a different operating state, in particular the bypass state, in particular a blocking state.
  • the term "high-resistance” should be understood as meaning in particular an electrical resistance of at least 500 ⁇ , advantageously of at least 1 k ⁇ , preferably of at least 5 k ⁇ and particularly preferably of at least 10 k ⁇ .
  • a "control connection” should be understood to mean, in particular, a connection, in particular an input, of the bridging unit, which is provided, depending on at least one applied signal, in particular an electrical potential and / or a current, a state of the at least one bridging unit in particular, a presence and / or a nonexistence of a low-resistance connection between the at least two bridging terminals to change.
  • the at least one Control connection free from a, in particular direct, connection to the control unit.
  • the at least one control connection can be embodied identically, in particular, with at least one of the bridging connections. In this way, in particular, a cost-effective and compact bridging unit can be achieved, which in particular can be mounted quickly and easily.
  • the bridging unit is designed to be current-controlled, a simple and, in particular, autonomous control of the bridging unit can advantageously be achieved.
  • the bridging unit is intended to at least partially bridge the protective unit.
  • An "at least substantially vanishing current intensity” should be understood to mean in particular a current intensity of at most 500 mA, in particular of at most 100 mA, preferably of at most 10 mA and particularly advantageously of not more than 1 mA. In this way, in particular, a control of the bridging unit can be further simplified.
  • the bridging unit has at least one energy storage unit which, in at least one operating state, defines at least one, in particular temporal, parameter of a bridging of the protection unit.
  • an "energy storage unit” should be understood to mean in particular a unit which is provided in at least one operating state, in particular to store electrical energy.
  • the at least one energy storage unit can be designed, for example, as a battery, as an accumulator, as an inductance and / or advantageously as a capacitor. In this way, advantageously, a state of the bridging unit can be adapted to different control options.
  • the at least one parameter could, for example, be a bridging inertia.
  • a "bridging inertia” is to be understood in particular as meaning a time duration between a control and a start of the bridging.
  • the at least one parameter is given by a duration of the bridging.
  • the duration of the bridging is in particular maximum 500 ⁇ s, advantageously at most 100 ⁇ s, preferably at most 50 ⁇ s and particularly preferably at most 20 ⁇ s. In this way, in particular an adaptation of the bridging unit to different control variants can be simplified.
  • control unit is provided to provide at least one, preferably exactly one, control signal for controlling a switching state of the at least one mechanical switch.
  • control signal for controlling a switching state of the at least one mechanical switch.
  • the at least one control signal is at least partially a pulse width modulated signal.
  • the pulse width modulated signal may have different duty cycles for different time periods.
  • a "duty cycle” is to be understood as meaning in particular a ratio of a time duration in which a, preferably periodic, control signal of the control unit assumes a switch-on value, in particular a high level, to a period duration of the control signal. In this way, in particular a simple and advantageously efficient control of the at least one mechanical switch can be achieved.
  • an efficiency can be increased and a turn-off can be improved.
  • the protection unit comprises at least one consumer unit, in particular a resistor and / or preferably a Zener diode.
  • a shutdown of the at least one mechanical switch can be accelerated.
  • a temperature dependence of the at least one mechanical switch can be minimized.
  • bridging unit is provided to bridge the at least one consumer unit, a switch-off process of the at least one mechanical switch can advantageously be accelerated easily.
  • FIG. 1 shows an exemplary designed as an induction hob cooking device 32 in a schematic plan view.
  • the cooking appliance 32 has a hob plate with four heating zones 34 in the present case. Each heating zone 34 is intended to heat exactly one cookware element (not shown).
  • the cooking appliance 32 comprises a cooking appliance device.
  • the cooking appliance device has an operating unit 36.
  • the operating unit 36 serves to input and / or select a power level by a user.
  • the cooking device device comprises a control unit 28.
  • the control unit 28 has a computing unit, a memory unit and an operating program stored in the memory unit, which is intended to be executed by the computing unit.
  • FIG. 2 shows a schematic diagram of the cooking appliance device.
  • the cooking appliance device has four inductors 38, 40, 42, 44. Each inductor 38, 40, 42, 44 is associated with one of the heating zones 34.
  • the cooking appliance device comprises two Inverters 46, 48.
  • the inverters 46, 48 are formed identical to each other.
  • Each inverter 46, 48 has two semiconductor switches 50, 52, in particular IGBTs.
  • the control unit 28 is connected to control terminals of the semiconductor switches 50, 52 (not shown).
  • Each of the inverters 46, 48 is intended to convert a pulsed rectified mains voltage of a power source 54 into a high frequency heating current and in particular to supply at least one of the inductors 38, 40, 42, 44.
  • the cooking appliance device has a plurality of line paths 56.
  • each of the inverters 46, 48 is connected to the inductors 38, 40, 42, 44 via conductive paths 56.
  • the cooking appliance device further comprises two resonance units 58.
  • Each of the resonance units 58 is part of an electrical resonant circuit and can be charged via the associated inverter 46, 48.
  • the cooking appliance device has a switching arrangement 60.
  • the switch assembly 60 includes a plurality of mechanical switches 10, 12.
  • the mechanical switches 10, 12 are designed to interrupt and / or establish the conductive paths 56 between the inverters 46, 48 and the inductors 38, 40, 42, 44.
  • the switching arrangement 60 comprises six mechanical switches 10, 12.
  • the mechanical switches 10, 12 are identical.
  • the mechanical switches 10, 12 are designed as a changeover switch.
  • the mechanical switches 10, 12 are formed in the present case as a relay.
  • Each of the conductive paths 56 is interruptible by two mechanical switches 10, 12.
  • Two first mechanical switches 10 are each connected to a heating current output 62, 64 of the inverters 46, 48.
  • the two first mechanical switches 10 are each connected to two second mechanical switches 12.
  • the two second mechanical switches 12 are each connected to one of the inductors 38, 40, 42, 44.
  • the cooking appliance device has a plurality of driver circuits 14.
  • Each driver circuit 14 is provided for driving one of the mechanical switches 10, 12.
  • the driver circuits 14 are formed identical to one another in the present case.
  • Each of the mechanical switches 10, 12 is associated with one of the driver circuits 14.
  • Each of the mechanical switches 10, 12 is connected to one of the driver circuits 14.
  • at least one Driver circuit form differently.
  • at least two mechanical switches could be assigned a single driver circuit.
  • the cooking appliance device may comprise further units, in particular rectifiers, filters, detectors, in particular current detectors and / or voltage detectors, and / or voltage transformers.
  • FIG. 3 shows an exemplary schematic circuit diagram of one of the mechanical switches 10, 12 and one of the driver circuits 14 FIG. 2 , The following description is exemplary of one of the mechanical switches 10, 12 and can in particular be transferred to the other mechanical switches 10, 12.
  • the mechanical switch 10, 12 has an anchor element 70.
  • the anchor element 70 is made of a ferromagnetic material.
  • the mechanical switch 10, 12 has a driver coil 72.
  • the driver coil 72 has a ferromagnetic core.
  • a driver coil may also be formed without a ferromagnetic core and / or have a core of a different material.
  • the drive coil 72 is provided in at least one operating state to attract the anchor member 70, in particular by a magnetic force.
  • the mechanical switch 10, 12 has three contacts.
  • a first contact is designed as a switching contact 74.
  • the switching contact 74 is indirectly and / or directly connected to one of the two Walkerstromaus réelle 62, 64.
  • a second contact is designed as a normally closed contact 76.
  • the normally closed contact 76 is indirectly and / or directly connected to one of the inductors 38, 40, 42, 44.
  • a third contact is designed as a normally open contact 78.
  • the normally open contact 78 is indirectly and / or directly connected to one of the inductors 38, 40, 42, 44.
  • the driver circuit 14 comprises a driver unit 66.
  • the driver unit 66 is used to drive the driver circuit 14.
  • the driver unit 66 is provided to control a function of the driver circuit 14.
  • the driver unit 66 has three terminals.
  • the driver circuit 14 has a protection unit 16.
  • the protection unit 16 is intended to protect the mechanical switch 10, 12 from overvoltage.
  • the protection unit 16 is provided to protect the driver unit 66 from overvoltage.
  • the protection unit 16 has three Connections on.
  • the driver circuit 14 further includes a bypass unit 18.
  • the bridging unit 18 has three terminals 20, 22, 24. In the present case, the bridging unit 18 has two bridging connections 20, 22 and a control connection 24.
  • the cooking appliance device has a supply unit (not shown).
  • the supply unit is provided to provide a supply voltage for the driver circuit 14.
  • a supply connection 68 is connected to the driver circuit 14.
  • the mechanical switch 10, 12 is connected to the driver circuit 14.
  • the mechanical switch 10, 12 has two connections.
  • the supply terminal 68 is connected to a first terminal of the drive coil 72.
  • the supply terminal 68 is connected to a first terminal of the protection unit 16. Furthermore, the supply connection 68 is connected to the control connection 24 of the bridging unit 18.
  • the first terminal of the driver coil 72 is connected to a first terminal of the protection unit 16. Furthermore, the first terminal of the driver coil 72 is connected to the control terminal 24 of the bridging unit 18. A second terminal of the driver coil 72 is connected to a first terminal of the driver unit 66. The second terminal of the driver coil 72 is connected to a third terminal of the protection unit 16. Furthermore, the second terminal of the driver coil 72 is connected to the second bridging terminal 22 of the bridging unit 18.
  • the first terminal of the protection unit 16 is connected to the control terminal 24 of the bridging unit 18.
  • a second terminal of the protection unit 16 is connected to the first bridging terminal 20 of the bridging unit 18.
  • the third terminal of the protection unit 16 is connected to the second bridging terminal 22 of the bridging unit 18. Furthermore, the third terminal of the protection unit 16 is connected to the first terminal of the driver unit 66.
  • the second bridging terminal 22 of the bridging unit 18 is further connected to the first terminal of the driver unit 66.
  • a second terminal of the driver unit 66 is connected to the control unit 28.
  • a third one Connection of the driver unit 66 connected to a ground fault.
  • a third terminal of a driver unit may also be grounded.
  • the driver unit 66 has at least one control switch 80.
  • the control switch 80 is formed in the present case as a bipolar transistor.
  • the control switch 80 is connected to a base contact via a resistor to the second terminal of the driver unit 66. Further, the control switch 80 is connected to the ground terminal with an emitter contact.
  • the control switch 80 is connected to a collector contact with the first terminal of the driver unit 66.
  • the driver unit 66 may have at least one further component, in particular at least one electrical resistance and / or at least one capacitor.
  • the protection unit 16 has a freewheeling diode 82. Furthermore, the protection unit 16 has a load unit 30.
  • the consumer unit 30 is formed in the present case as a Zener diode.
  • the freewheeling diode 82 is connected to a cathode contact with the first terminal of the protection unit 16.
  • the freewheeling diode 82 is connected to the second terminal of the protection unit 16 with an anode contact.
  • the consumer unit 30 is connected to the third terminal of the protection unit 16 with a first contact, in particular a cathode contact.
  • the consumer unit 30 is connected to the second terminal of the protection unit 16 with a second contact, in particular an anode contact.
  • the consumer unit 30 is connected to the second contact, in particular the anode contact, with the anode contact of the freewheeling diode 82.
  • the bridging unit 18 has at least one bridging switch 84 in the present case. Furthermore, the bridging unit 18 has an energy storage unit 26. The energy storage unit 26 is formed in the present case as a capacitor. The energy storage unit 26 is in operative connection with the bridging switch 84. Furthermore, the bridging unit 18 can have at least one further component, in particular at least one electrical resistance and / or at least one capacitor.
  • the bridging unit 18 is intended to at least partially bridge the protection unit 16 in at least one operating state.
  • the bridging unit 18 is designed to be self-controlling. Accordingly, the bridging unit 18 is free of direct connections to the control unit 28.
  • the bridging unit 18 is provided to bridge the load unit 30 in the at least one operating state.
  • the bypass switch 84 is provided to bypass the load unit 30 in the at least one operating state.
  • the bridging unit 18 is designed to be current-controlled. In this case, a bridging state of the bridging unit 18 may be changed depending on a current flowing through the control terminal 24 of the bridging unit 18.
  • control unit 28 is provided to provide a control signal for controlling a switching state of the mechanical switch 10, 12.
  • the control signal of the control unit 28 is applied to the second terminal of the driver unit 66.
  • FIG. 4 shows a schematic diagram of the control signal for controlling a switching state of the mechanical switch 10, 12 and associated switching operations of the mechanical switch 10, 12.
  • an abscissa axis 86 the time is shown.
  • An ordinate axis 88 is shown as a size axis.
  • a curve 90 shows the control signal provided by the control unit 28.
  • the control signal is given in the present case, at least partially by a pulse width modulated signal. Accordingly, the control signal can assume at least a high level and at least a low level.
  • a curve 92 illustrates the switching operations.
  • a "1" level defines a conductive connection between the switch contact 74 and the normally closed contact 76 of the mechanical switch 10, 12.
  • a "-1" level defines a conductive connection between the switch contact 74 and the make contact 78 of the mechanical switch 10, 12.
  • a "0" level defines a non-conductive state.
  • the control signal has the low level.
  • the control switch 80 is open and therefore non-conductive. In this case, no current flows into the control connection 24 of the bridging unit 18 In this case, the bridging terminals 20, 22 are connected with high resistance.
  • the bypass switch 84 is non-conductive.
  • the drive coil 72 is current-free.
  • the switching contact 74 of the mechanical switch 10, 12 is conductively connected to the normally closed contact 76.
  • the control signal changes.
  • the control signal has the high level.
  • the control switch 80 is closed and therefore conductive.
  • a partial current flows into the control terminal 24 of the bridging unit 18.
  • the bridging terminals 20, 22 are connected to low resistance.
  • the bypass switch 84 is conductive.
  • the split current may flow through the bypass switch 84 and the control switch 80 to the ground terminal.
  • the partial flow can flow to the ground connection through the consumer unit 30, which is connected in particular in the forward direction, and the control switch 80.
  • the partial flow which flows through the bridging unit 18 is further provided to charge the energy storage unit 26.
  • a switching current flows through the driving coil 72.
  • the switching current flows through the driving coil 72 and the control switch 80 to the ground terminal.
  • a maximum average current flows through the driver coil 72.
  • the anchor member 70 changes its position, so that the switching contact 74 is conductively connected to the normally open contact 78.
  • the second time interval t 2 has a time duration of 100 ms in the present case.
  • the switching process begins at a time T S1 .
  • the switching process ends at a time T S2.
  • a switching operation in the present case has a duration of 10 ms.
  • the control unit 28 is provided to deactivate the inverters 46, 48 at least during the switching operation.
  • the control signal changes. From the time T 2 , the control signal is given by a pulse width modulated signal. A duty cycle of the control signal has a value of 0.7. During an entire third time interval t 3 , the control signal has the duty cycle with the value 0.7. Furthermore, the control signal has a frequency of 25 kHz. In this hold state, the control signal causes the control switch 80 to be alternately closed and opened is. At a high level of the control signal, an operation analogous to the on state takes place. At a low level of the control signal, the control switch 80 is opened and therefore non-conductive. In this case, no current flows into the control terminal 24 of the bridging unit 18.
  • the bridging unit 18 is provided in this case, in particular a case of a vanishing current through the control terminal 24, to at least partially bridge the protection unit 16.
  • the bridging unit 18 is provided to bridge the consumer unit 30.
  • a charge of the energy storage unit 26 ensures that the bypass switch 84 is conductive.
  • the bridging terminals 20, 22 are connected to low resistance.
  • the energy storage unit 26 is provided to define a parameter of a bypass of the protection unit 16.
  • the parameter is given by a period of bridging.
  • the duration of the bridging corresponds to the maximum time duration in which the bridging terminals 20, 22 are connected to low impedance at vanishing current intensity at the control terminal 24.
  • the duration of the bridging corresponds in the present case just a time duration of the low level of the pulse width modulated signal.
  • the bridging time corresponds to 12 ⁇ s in the present case.
  • Due to the sudden switching off of the current a high induction voltage occurs through the driver coil 72.
  • the protection unit 16 and / or the bridging unit 18 are intended to reduce this induction voltage.
  • a loop current caused by the induction voltage flows through the bypass unit 18, the flywheel diode 82, and the drive coil 72. In this case, the circulating current flows through the bypass switch 84, the flywheel diode 82, and the drive coil 72.
  • a mean current flows through the driver coil 72.
  • the average current corresponds to a, in particular minimal, required holding current.
  • the anchor element 70 can be held on the working contact 78.
  • the switching contact 74 is conductively connected to the normally open contact 78. This can increase efficiency and self-heating of the mechanical switch 10, 12 can be reduced.
  • the control signal changes.
  • the control signal has the low level.
  • the Control switch 80 is opened and therefore non-conductive.
  • an analog operation takes place relative to the low level of the hold state.
  • the bypass switch 84 changes to a non-conductive state.
  • the bridging terminals 20, 22 are connected with high resistance.
  • the bypass switch 84 is non-conductive.
  • the protection unit 16 is intended to reduce the resulting induction voltage. A circulating current caused by the induction voltage flows through the load unit 30, the freewheeling diode 82 and the drive coil 72.
  • FIG. 5 shows the schematic diagram FIG. 3 with an exemplary embodiment of the bridging unit 18. In the following, only the design of the bridging unit 18 will be described.
  • the bypass switch 84 is formed in the present case as a bipolar transistor.
  • the designed as a capacitor energy storage unit 26 has in the present case has a capacity of about 200 nF.
  • the control terminal 24 of the bridging unit 18 is connected to a first contact of a first resistor 94 of the bridging unit 18.
  • a second contact of the first resistor 94 is connected to a base contact of the bypass switch 84.
  • the second contact of the first resistor 94 is connected to a first contact of the energy storage unit 26.
  • the second contact of the first resistor 94 is connected to a first contact of a second resistor 96 of the bridging unit 18.
  • the first contact of the energy storage unit 26 is connected to the first contact of the second resistor 96.
  • the first contact of the energy storage unit 26 is connected to the base contact of the bypass switch 84.
  • the first contact of the second resistor 96 is connected to the base contact of the bypass switch 84.
  • a second contact of the energy storage unit 26 is connected to a second contact of the second resistor 96.
  • the second contact of the energy storage unit 26 is further connected to the first bridging terminal 20.
  • the second contact of the energy storage unit 26 is connected to an emitter contact of the bypass switch 84.
  • the second contact of the second resistor 96 is connected to the first bypass terminal 20.
  • the second contact of the second resistor 96 is connected to an emitter contact of the bypass switch 84.
  • a collector contact of the bypass switch 84 is connected to the second bypass terminal 22.
  • the second resistor 96 is connected in parallel with the energy storage unit 26. Further, the bypass switch 84 is connected in parallel to the load unit 30.

Landscapes

  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Engineering & Computer Science (AREA)
  • Food Science & Technology (AREA)
  • Electronic Switches (AREA)
  • Relay Circuits (AREA)
  • Inverter Devices (AREA)

Claims (12)

  1. Dispositif d'appareil de cuisson, en particulier dispositif de plaque de cuisson, doté d'au moins un commutateur mécanique (10, 12), d'au moins un circuit d'attaque (14) qui est destiné à commander ledit au moins un commutateur mécanique (10, 12) et qui comprend une unité de protection (16) et une unité de pontage (18) destinée, dans au moins un état de fonctionnement, à ponter au moins partiellement l'unité de protection (16), caractérisé en ce que l'unité de pontage (18) est à commande automatique.
  2. Dispositif d'appareil de cuisson selon la revendication 1, caractérisé en ce que l'unité de pontage (18) présente au moins deux bornes de pontage (20, 22) et au moins une borne de commande (24).
  3. Dispositif d'appareil de cuisson selon la revendication 1 ou 2, caractérisé en ce que l'unité de pontage (18) est à commande par courant.
  4. Dispositif d'appareil de cuisson selon la revendication 2 ou 3, caractérisé en ce que l'unité de pontage (18), en cas de disparition au moins sensible de l'intensité du courant par ladite au moins une borne de commande (24), est destinée à ponter au moins partiellement l'unité de protection (16).
  5. Dispositif d'appareil de cuisson selon l'une des revendications précédentes, caractérisé en ce que l'unité de pontage (18) présente au moins une unité d'accumulation d'énergie (26) qui, dans au moins un état de fonctionnement, définit au moins un paramètre d'un pontage de l'unité de protection (16).
  6. Dispositif d'appareil de cuisson selon la revendication 5, caractérisé en ce que ledit au moins un paramètre est déterminé par une durée du pontage.
  7. Dispositif d'appareil de cuisson selon l'une des revendications précédentes, caractérisé par une unité de commande (28) destinée à fournir au moins un signal de commande pour commander un état de commutation du au moins un commutateur mécanique (10, 12).
  8. Dispositif d'appareil de cuisson selon la revendication 7, caractérisé en ce que ledit au moins un signal de commande est du moins en partie un signal modulé en largeur d'impulsions.
  9. Dispositif d'appareil de cuisson au moins selon la revendication 6 et 8, caractérisé en ce que la durée du pontage correspond à une durée au moins d'un niveau bas du signal modulé en largeur d'impulsions.
  10. Dispositif d'appareil de cuisson selon l'une des revendications précédentes, caractérisé en ce que l'unité de protection (16) comprend au moins une unité consommateur (30).
  11. Dispositif d'appareil de cuisson selon la revendication 10, caractérisé en ce que l'unité de pontage (18) est destinée à ponter ladite au moins une unité consommateur (30).
  12. Appareil de cuisson, en particulier table de cuisson, doté d'au moins un dispositif d'appareil de cuisson selon l'une des revendications précédentes.
EP15715445.1A 2014-03-24 2015-03-19 Dispositif pour appareil de cuisson avec unité de pontage à commande automatique Active EP3123816B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
ES201430407 2014-03-24
PCT/IB2015/052015 WO2015145309A1 (fr) 2014-03-24 2015-03-19 Dispositif pour appareil de cuisson avec unité de pontage à commande automatique

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EP3123816B1 true EP3123816B1 (fr) 2017-12-27

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US (1) US10440783B2 (fr)
EP (1) EP3123816B1 (fr)
ES (1) ES2655654T3 (fr)
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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
ES2633458B1 (es) * 2016-03-21 2018-06-27 Bsh Electrodomésticos España, S.A. Dispositivo de protección de aparato doméstico

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Also Published As

Publication number Publication date
US20170105250A1 (en) 2017-04-13
WO2015145309A1 (fr) 2015-10-01
US10440783B2 (en) 2019-10-08
ES2655654T3 (es) 2018-02-21
EP3123816A1 (fr) 2017-02-01

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