CN119402995B - A control method and circuit for a high-power heating element - Google Patents
A control method and circuit for a high-power heating elementInfo
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- CN119402995B CN119402995B CN202411520845.3A CN202411520845A CN119402995B CN 119402995 B CN119402995 B CN 119402995B CN 202411520845 A CN202411520845 A CN 202411520845A CN 119402995 B CN119402995 B CN 119402995B
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/44—Circuits or arrangements for compensating for electromagnetic interference in converters or inverters
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R19/00—Arrangements for measuring currents or voltages or for indicating presence or sign thereof
- G01R19/175—Indicating the instants of passage of current or voltage through a given value, e.g. passage through zero
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/001—Measuring interference from external sources to, or emission from, the device under test, e.g. EMC, EMI, EMP or ESD testing
- G01R31/002—Measuring interference from external sources to, or emission from, the device under test, e.g. EMC, EMI, EMP or ESD testing where the device under test is an electronic circuit
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- 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
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- General Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Control Of Resistance Heating (AREA)
Abstract
本发明涉及电子电路技术领域，公开了一种大功率发热元件的控制方法包括：S10，通过过零检测电路获取交流电源的过零信号；S20，将过零信号输出到主控电路；S30，主控电路根据过零信号输出控制信号到双向可控硅驱动电路；S40，双向可控硅驱动电路根据控制信号控制负载电路，负载电路用于控制发热元件导通或断开；其中，发热元件包括至少两个并联的发热模块，每个发热模块对应一个双向可控硅驱动电路，双向可控硅驱动电路通过分别控制各个发热模块在不同时刻的通断，优先保证发热元件的功率周期最小，双向可控硅驱动电路通过分别控制各个发热模块在不同时刻的通断，保证每个过零点前后相临的T/2时间段中发热元件的功率差值的最大值最小。
This invention relates to the field of electronic circuit technology and discloses a control method for a high-power heating element, comprising: S10, acquiring a zero-crossing signal of an AC power supply through a zero-crossing detection circuit; S20, outputting the zero-crossing signal to a main control circuit; S30, the main control circuit outputting a control signal to a bidirectional thyristor drive circuit according to the zero-crossing signal; S40, the bidirectional thyristor drive circuit controlling a load circuit according to the control signal, the load circuit being used to control the heating element to be turned on or off; wherein, the heating element includes at least two parallel heating modules, each heating module corresponding to a bidirectional thyristor drive circuit, the bidirectional thyristor drive circuit prioritizing the minimum power cycle of the heating element by controlling the on/off state of each heating module at different times, and the bidirectional thyristor drive circuit ensuring that the maximum value of the power difference of the heating element in the T/2 time period before and after each zero-crossing point is minimized by controlling the on/off state of each heating module at different times.
Description
Technical Field
The invention relates to the technical field of electronic circuits, in particular to a control method and a circuit of a high-power heating element.
Background
EMC tests (electromagnetic compatibility tests) are used to evaluate the performance of electronic devices in an electromagnetic environment, including the resistance of the device to electromagnetic interference (immunity) and the control of electromagnetic interference (radiation) generated by the device itself. Its purpose is to ensure that the device does not interfere with, nor is it interfered by, other devices. High-power heating element, namely heating element with standard alternating voltage (AC 220V, AC V or AC 240V) of commercial power and standard frequency (50 Hz or 60 Hz), load current > =16A, namely load power > =3520W. High power heating elements are commonly used to heat liquids, gases, or solids. In many application scenarios, the high-power heating element needs to be heated quickly to enable the substances to reach different temperatures, and bidirectional thyristors are generally adopted to control the heating element so as to realize power of a plurality of different gears.
Currently, there are large power heating elements on the market, such as single heating tube large power heating element, 2 heating tube large power heating elements, and 3 or more heating tube large power heating elements. For a single heating tube high-power heating element, if a traditional bidirectional thyristor control method is used, the heating element is divided into a plurality of different gears by using a phase shift triggering mode, then in the process of performing EMC test, a circuit can generate larger electromagnetic interference, the electromagnetic interference causes waveform distortion of a power grid voltage, and power grid harmonic pollution is increased, so that a conduction interference test in the EMC test is difficult to pass, if the bidirectional thyristor is used, the heating element is divided into a plurality of different gears by using a zero crossing triggering mode, and because the on-off ratio of the minimum gear power is too small, phenomena such as lighting flicker, ammeter pointer jitter and the like can occur when the power grid capacity is not large enough, and the voltage fluctuation and the flicker test in the EMC test are also difficult to pass the test. For 2 and 3 or more heating tube high-power heating elements (load current > =16a), if the conventional triac control method is still used, the passing rate of EMC test is also challenging.
Therefore, a control method for improving the passing rate of the high-power heating element when performing EMC test is needed.
Disclosure of Invention
The invention aims to solve the technical problem that the passing rate of the existing high-power heating element is low when EMC test is carried out.
In order to solve the above technical problems, the present invention provides a control method of a high-power heating element, which is characterized in that the control method of the heating element includes:
s10, acquiring a zero-crossing signal of an alternating-current power supply through a zero-crossing detection circuit;
s20, outputting the zero crossing signal to a main control circuit;
s30, the main control circuit outputs a control signal to the bidirectional thyristor driving circuit according to the zero crossing signal;
And S40, the bidirectional thyristor driving circuit controls a load circuit according to the control signal, and the load circuit is used for controlling the heating element to be connected or disconnected, wherein the heating element comprises at least two heating modules which are connected in parallel, each heating module corresponds to one bidirectional thyristor driving circuit, the bidirectional thyristor driving circuit preferably ensures that the power cycle of the heating element is minimum by respectively controlling the on-off of each heating module at different moments, and the bidirectional thyristor driving circuit ensures that the maximum value of the power difference value of the heating element is minimum in the adjacent T/2 time periods before and after each zero crossing point by respectively controlling the on-off of each heating module at different moments.
Still further, the number of the heating modules is 2, the two heating modules are a first heating module and a second heating module respectively, the first heating module is connected with the second heating module in parallel, and the power of the first heating module is smaller than that of the second heating module.
Still further, the control method of the heating element further includes:
the heating element outputs power of a plurality of gears according to the requirement of the load circuit.
Further, the power difference of each adjacent gear in the power of the plurality of gears is equal.
According to another aspect of the present invention, there is provided a circuit of a high-power heating element, the circuit of the heating element including:
an ac power supply for supplying ac power;
the zero-crossing detection circuit is used for acquiring a zero-crossing signal of the alternating-current power supply and outputting the zero-crossing signal to the main control circuit;
the main control circuit is used for outputting a control signal to the bidirectional thyristor driving circuit according to the zero crossing signal;
The bidirectional thyristor driving circuit is used for controlling the load circuit according to the control signal;
And the load circuit is used for controlling the heating element, wherein the heating element comprises 2 or more heating modules which are connected in parallel, and each heating module corresponds to one bidirectional thyristor driving circuit.
Further, the load circuit outputs different power gears by controlling the on or off time of the heating module in the heating element.
Compared with the prior art, the control method of the high-power heating element passing EMC test has the beneficial effects that:
the embodiment of the invention controls the on-off of each heating module at different moments through the bidirectional thyristor driving circuit, preferably ensures that the power cycle of the heating element is minimum, and the smaller the cycle of the heating element is, the shorter the interference time of the heating element to the circuit is, the smaller the interference of the heating element to the circuit is, the power cycle of the heating element is set to be minimum, the possibility that the circuit passes EMC test is improved, the success rate of the control method passing EMC test is improved, the embodiment of the invention only needs to connect a plurality of heating modules in parallel, the on-off of each heating module at different moments is respectively controlled through the bidirectional thyristor driving circuit, the maximum value of the power difference of the heating element is ensured to be minimum in the T/2 time period adjacent to each zero crossing point, the larger the maximum value of the power difference of the heating element is, the larger the variation amplitude of the power of the heating element is, the interference of the heating element to the circuit is larger, the maximum value of the power difference of the heating element is set to be minimum, the interference of the heating element to the circuit is reduced, the possibility that the circuit passes EMC test is improved, the success rate of the control method passing EMC test is improved, the embodiment of the invention only needs to connect a plurality of heating modules in parallel, the corresponding silicon modules and the corresponding detection circuit is arranged, the number of the corresponding heating modules is mutually connected to the heat element is reduced, the total power of the heat element is capable of the heat element is more than the heat by the heat element has the power to have the power interference to the circuit through the heat test, and the heat, the embodiment of the invention can also control the heating power of each heating module so as to influence the power of the heating element, realize the multi-gear adjustment of the heating element, and each gear can pass the EMC test.
Drawings
FIG. 1 is a flow chart of a control method of a high-power heating element provided by an embodiment of the invention;
Fig. 2 is a comparison chart of load circuit parameters of each gear of the B heating element and the C heating element in the control method of the high-power heating element according to the embodiment of the invention.
FIG. 3 is a circuit diagram of a control method of a high-power heating element according to an embodiment of the present invention;
FIG. 4 is another circuit diagram of a control method of a high-power heating element according to an embodiment of the present invention;
FIG. 5 is a diagram of load circuit parameters of each gear of the gear shift adjustment in the control method of the high-power heating element provided by the embodiment of the invention;
fig. 6 is a table diagram in the load circuit parameter diagram for each gear in fig. 5.
Detailed Description
Exemplary embodiments of the present invention will now be described with reference to the accompanying drawings, in which various details of the embodiments of the present invention are included to facilitate understanding, and are to be considered merely exemplary. Accordingly, one of ordinary skill in the art will recognize that various changes and modifications of the embodiments described herein can be made without departing from the scope of the invention. Also, descriptions of well-known functions and constructions are omitted in the following description for clarity and conciseness.
As shown in fig. 1, 2 and 3, in an alternative embodiment of the present invention, the control method of the heating element includes:
s10, acquiring a zero-crossing signal of an alternating-current power supply through a zero-crossing detection circuit;
s20, outputting the zero crossing signal to a main control circuit;
s30, the main control circuit outputs a control signal to the bidirectional thyristor driving circuit according to the zero crossing signal;
And S40, the bidirectional thyristor driving circuit controls a load circuit according to the control signal, and the load circuit is used for controlling the heating element to be connected or disconnected, wherein the heating element comprises at least two heating modules which are connected in parallel, each heating module corresponds to one bidirectional thyristor driving circuit, the bidirectional thyristor driving circuit preferably ensures that the power cycle of the heating element is minimum by respectively controlling the on-off of each heating module at different moments, and the bidirectional thyristor driving circuit ensures that the maximum value of the power difference value of the heating element is minimum in the adjacent T/2 time periods before and after each zero crossing point by respectively controlling the on-off of each heating module at different moments.
Wherein the zero-crossing detection circuit is used for detecting a zero-crossing signal of the electric alternating current. For example, in alternating current of mains supply, each half cycle T/2 generates a zero crossing signal, t=20 ms when the frequency F of the alternating current is 50Hz, and t≡ 16.667ms when the frequency of the alternating current is 60 Hz. Zero crossing signals refer to signals of alternating current waveforms at zero voltage points. Specifically, when the alternating current transitions from positive to negative (or vice versa), the voltage value is zero, this moment being called the "zero crossing". In the zero-crossing detection circuit, after the point is detected, corresponding control or switching operation can be performed, so that accurate phase control is realized, electromagnetic interference can be reduced by detecting the zero-crossing point, and the efficiency and stability of a circuit system are improved. In the embodiment of the invention, the detected zero crossing signal is used for being transmitted to the bidirectional thyristor, and the conduction or the closing of the heating element is controlled in a zero crossing triggering mode.
The bidirectional thyristor driving circuit is characterized in that the bidirectional thyristor driving circuit is used for controlling the on-off of each heating module at different moments, so that the minimum power cycle of the heating element is preferentially ensured, the cycle of the heating element is 1T, 2T and 3T of alternating current, when the power of the heating element is configured, the minimum cycle should be preferentially selected, for example, in fig. 2, the graphs B1-B14 are the parameter graphs of each gear of the heating element B, the graphs C1-C14 are the parameter graphs of each gear of the heating element C, 2 heating elements in the graphs are equally divided into 14 gears, 2 heating modules are arranged, the total power of heating of the two heating modules is equal, the green curve and the blue curve respectively represent the parameter graphs of the different heating modules at each time period, the blue curve represents the first heating module, the green curve represents the second heating module, in the 2 nd gear, and we can see by comparing the graphs B2 and C2, the power cycle of the B element in the graph B2 is T, the power cycle of the C2 is the power cycle of the heating element B is the power cycle of the power is the T, and the power cycle is less than the power cycle of the heating element C is the power cycle is less than the power cycle of the heating element when the heating element is the power of the heating element is less than the time, and the power cycle is less than the power cycle of the heating element is more than the time-variable, and the power cycle is ensured when the power cycle is less than the power cycle is the power of the heating element is the time-variable when the heating element is the time is less than the time-variable, and the power cycle is the time-variable. In fig. 2, the B heating elements of the 2 nd, 5 th, 7 th, 9 th and 12 th are all realized by preferentially selecting the smallest period when the power period arrangement of the heating elements is performed.
Wherein, on the premise of ensuring the minimum power cycle of the heating element, the bidirectional thyristor driving circuit ensures that the maximum value of the power difference value of the heating element in the T/2 time zone adjacent to each zero crossing point is minimum by respectively controlling the on-off of each heating module at different moments, for example, in the figure 2, the figures B1-B14 are the parameter figures of each gear of the B heating element, the figures C1-C14 are the parameter figures of each gear of the C heating element, 2 heating elements in the figures are evenly divided into 14 gears, 2 heating modules are arranged, the total heating power of the two heating modules is equal, the output power of the first module is recorded as P First module , the output power of the second module is recorded as P Second module , the green curve and the blue curve respectively represent the parameter figures of the different heating modules in each time zone, the blue curve represents the first heating module, the green curve represents the second heating module, in the 6 th gear, we can see through the comparison of the figures B6 and the figure C6, the maximum value of the heating element in the time zone C6 is the time zone 2, the maximum value of the current difference value of the T2/2 in the time zone 2, the time zone is the maximum value of the T2 of the heating element in the time zone, the time zone 2-T2 is different from the maximum value of the T2/2, the current of the maximum value of the heating element in the time zone 2T 2, and the time zone is equal to the maximum value of the current of the T2/2 in the time zone of the T2, and the time zone of the time zone is equal to the maximum value of the power difference value of the heating element in the time zone of the T2, namely P Second module -0＝P Second module , the time period with the largest fluctuation of the output power in the T/2 time period adjacent to the zero crossing point in the graph C6 is 3T/2-5T/2, the maximum value of the power difference value of the C heating element in the graph C6 is the difference value between the sum of the output powers of the first heating module and the second heating module in the time period of 2T-5T/2 and 0, namely P First module +P Second module -0＝P First module +P Second module , so that the maximum value of the power difference value of the B heating element in the T/2 time period adjacent to the zero crossing point in the graph B6 is smaller than the maximum value of the power difference value of the C heating element in the T/2 time period adjacent to the zero crossing point in the graph C6, namely P First module ＜P First module +P Second module , the maximum value of the power difference value of the B heating element is ensured to be minimum, the maximum value of the power difference value of the heating element is ensured to be selected, the variation amplitude of the power of the heating element can be reduced, the interference of the heating element to the circuit is reduced, and the success rate of the control method of the high-power heating element passing the test is improved. In the 8 th gear, we can see that the period of the B heating element in the B8 and the period of the C heating element in the C8 are 2T, the power emitted by the B heating element in the B8 and the C heating element in the C8 are the same in one period, the time period with the largest fluctuation of the output power in the T/2 time period adjacent to the zero crossing point in the B8 is the time period of 0-T, the maximum value of the power difference value of the B heating element in the B8 is the difference value of the power of the heating element in the time period of 0-T/2 and the power of the heating element in the time period of T/2-T, so the difference value is the sum of the output power of the first heating module in the time period of 0-T/2 and the output power of the first heating module and the second heating module in the time period of T/2-T, namely P First module +P Second module -P First module ＝P Second module ; the period in which the fluctuation of the output power is largest in the period of T/2 adjacent to and after the zero crossing point in fig. C8 is a period of 3T/2 to 5T/2, the maximum value of the power difference of the C heating element in fig. C8 is the difference between the sum of the output powers of the first heating module and the second heating module in the period of 2T to 5T/2 and 0, i.e., P First module +P Second module -0＝P First module +P Second module , so that the maximum value of the power difference of the B heating element in the period of T/2 adjacent to and after the zero crossing point in fig. B8 is smaller than the maximum value of the power difference of the C heating element in the period of T/2 adjacent to and before the zero crossing point in fig. C8, i.e., P Second module ＜P First module +P Second module , the B heating element should be selected in order to ensure that the maximum value of the power difference is smallest, the variation amplitude of the power of the heating element can be reduced by setting the maximum value of the power difference of the heating element to be smallest, the interference of the heating element to the circuit is reduced, so that the success rate of the control method of the high-power heating element passing EMC test is improved. The B heating elements of the 6 th and 8 th stages in the drawing are all realized by setting the maximum value of the power difference of the heating elements in the T/2 time period adjacent to the zero crossing point to be minimum.
The embodiment of the invention controls the on-off of each heating module at different moments through the bidirectional silicon controlled drive circuit respectively, preferably ensures that the power cycle of the heating element is minimum, and the smaller the cycle of the heating element is, the shorter the interference time of the heating element to the circuit is, the smaller the interference of the heating element to the circuit is, the power cycle of the heating element is set to be minimum, the possibility that the circuit passes EMC test is improved, the success rate of the control method passing EMC test is improved, the embodiment of the invention only needs to connect a plurality of parallel connection modules, the on-off of each heating module at different moments is respectively controlled through the bidirectional silicon controlled drive circuit, the maximum value of the power difference of the heating element is ensured to be minimum in the T/2 time period adjacent to each zero crossing point, the larger the maximum value of the power difference of the heating element is, the larger the variation amplitude of the power of the heating element is, the interference of the heating element to the circuit is the larger, the maximum value of the power difference of the heating element is set to be the smallest, the interference of the heating element to the circuit is reduced, the possibility that the circuit passes EMC test is improved, the success rate of the control method passing EMC test is only needs to be improved, the number of the corresponding parallel connection modules is required, the corresponding heat modules are arranged, the heat modules are connected to each other heat element to be connected in parallel connection mode by the heat element to the test circuit, the heat element is the smaller the total power of the heat element is the heat element, the total power is the heat has the total power can be distributed to the heat, and the heat has the power effect that the heat efficiency of the heat test mode that the heat, the embodiment of the invention can also control the heating power of each heating module so as to influence the power of the heating element, realize the multi-gear adjustment of the heating element, and each gear can pass the EMC test.
In an alternative embodiment of the present invention, as shown in fig. 1, 4, 5 and 6, the number of the heat generating modules is 2, and the 2 heat generating modules are a first heat generating module and a second heat generating module, respectively, where the first heat generating module is connected in parallel with the second heat generating module, and the power of the first heat generating module is smaller than that of the second heat generating module.
The power of the heating element is the sum of the powers of all the heating modules connected in parallel, the power of the heating element can be set to be different gears for adapting to different scene demands, because the heating element is connected with alternating current, the power of the heating module is the power for conducting the cycle time of one heating module, the gear adjustment at the moment can realize the power of the smaller heating module by dividing the conduction time of one cycle, for example, when the power of the heating module is 1000w, the cycle of the alternating current is T, when the cycle of the heating module is T, the heating power of the heating module is 1000w when the cycle of the heating module is T, and the heating power of the heating module is 500w when the cycle of the heating module is 1/2T, and when the cycle of the heating module is 2T, the heating power of the heating module is conducted for the whole 2T, the different powers of the heating modules are 500w, and the different cycles are set to be mutually matched, and the heating element can be divided into a plurality of gears.
Specifically, as shown in fig. 5 and 6, in fig. 5, a graph D is a voltage input waveform of the ac power supply, a graph E0 is a waveform when the load voltage is 0, and the corresponding load current is also 0 (shown in a graph F0), where the power of the heating element is 0. Fig. Ex (x=1 to 14) shows the load voltage waveform of the x-th stage, and the corresponding load current waveform of the x-th stage is fig. Fx (x=1 to 14). The total power of the heating element is 5600W, the power of the first heating module is 1600W, the power of the second heating module is 4000W, the heating element can be divided into 14 stages, the 1 st stage is that the period of the heating module is 2T, the time for conducting the first heating module T/2, the second heating module is not conducting, the power of the first stage of the heating element is 400W, the 2 nd stage is that the period of the heating module is T, the time for conducting the first heating module T/2, the second heating module is not conducting, the power of the first stage of the heating element is 800W, the 3 rd stage is that the period of the heating module is 2T, the time for conducting the first heating module 3T/4, the second heating module is not conducting, the power of the first stage of the heating element is 1200W, and the same parameters are shown in FIG. 6, the 14 th stage is that the period of the heating module is T, the time for conducting the first heating module T, the time for conducting the second module T, the power of the first module is 1600W, the power of the first stage is 4000 W=0W, and the power of the heating element is 4000 W=0W. When the power of the first heating module is different from that of the second heating module, the power of the second heating module is 2.5 times that of the first heating module, and the power difference of the gears is equal.
In the embodiment of the invention, the parallel configuration of the two heating modules provides more power gears. The first module has smaller power and is suitable for low-demand scenes, and the second module provides higher power and meets larger heat demands. The power of different heating modules can be set with different periods, so that the power of the heating element can be divided into a plurality of gears, the heating element with the plurality of gears meets the requirements of different scenes, the smooth gear switching can also reduce the instantaneous current change and the mutual interference between circuits, thereby improving the overall electromagnetic compatibility, the stability of the whole circuit and the passing rate of EMC test.
In an alternative embodiment of the invention, the power difference of each adjacent gear of the power of the plurality of gears is equal.
Wherein adjacent gear refers to a gear in which power of a plurality of gears in the heating element is close, for example, power of a plurality of gears of the heating element has 400W, 800W and 1200W, three gears, at this time, gears 400W and 800W,800W and 1200W are adjacent gears, power difference of adjacent gears refers to a group of gears, and power difference between adjacent gears is equal, for example, in the above example, 800W-400 w=1200W-800W.
In the embodiment of the invention, the power differences of adjacent gears are equal, so that when a user switches between different gears, the heat change is more stable, the use experience is improved, the user is facilitated to carry out finer temperature adjustment according to the needs and adapt to different environments and application requirements, the design of equal power differences is also facilitated to maintain the stability of the circuit in each gear, and the problem of mutual interference among circuits caused by overlarge fluctuation of power adjustment is solved.
In an embodiment of the present invention, there is provided a circuit of a high-power heating element passing EMC test, the circuit of the heating element including:
an ac power supply for supplying ac power;
the zero-crossing detection circuit is used for acquiring a zero-crossing signal of the alternating-current power supply and outputting the zero-crossing signal to the main control circuit;
the main control circuit is used for outputting a control signal to the bidirectional thyristor driving circuit according to the zero crossing signal;
The bidirectional thyristor driving circuit is used for controlling the load circuit according to the control signal;
And the load circuit is used for controlling the heating element, wherein the heating element comprises at least two heating modules which are connected in parallel, and each heating module corresponds to one bidirectional thyristor driving circuit.
The bidirectional thyristor driving circuit is used for preferentially ensuring that the power cycle of the heating element is minimum by respectively controlling the on-off of each heating module at different moments, and ensuring that the maximum value of the power difference value of the heating element in the adjacent T/2 time periods before and after each zero crossing point is minimum by respectively controlling the on-off of each heating module at different moments.
The embodiment of the invention controls the on-off of each heating module at different moments through the bidirectional thyristor driving circuit, preferably ensures that the power cycle of the heating element is minimum, and the smaller the cycle of the heating element is, the shorter the interference time of the heating element to the circuit is, the smaller the interference of the heating element to the circuit is, the power cycle of the heating element is set to be minimum, the possibility that the circuit passes EMC test is improved, the success rate of the circuit passing EMC test is improved, the embodiment of the invention only needs to connect a plurality of heating modules in parallel with each other, the on-off of each heating module at different moments is respectively controlled through the bidirectional thyristor driving circuit, the maximum value of the power difference of the heating element in the T/2 time period adjacent to each zero crossing point is ensured, the larger the maximum value of the power difference of the heating element is, the larger the power variation amplitude of the heating element is, the interference of the heating element to the circuit is larger, the maximum value of the power difference of the heating element is set to be minimum, the interference of the heating element to the circuit can be reduced, the success rate of the circuit passing test is improved, the circuit passing EMC test is only needed to connect a plurality of heating modules in parallel with each other, the corresponding quantity of the heating modules is arranged, the total power of the heat modules can be distributed to the heat element is reduced, the total power of the heat element can be tested to the heat element is more than the heat has the total power of the heat element is more than the heat by the heat module is more than the heat to the heat element, and the heat has the power has the interference to the power test mode, the embodiment of the invention can also control the heating power of each heating module so as to influence the power of the heating element, realize the multi-gear adjustment of the heating element, and each gear can pass the EMC test.
In an alternative embodiment of the invention, the load circuit outputs different power levels by controlling the time of turning on or off the heat generating module in the heat generating element.
The power of the heating module is the power for conducting the cycle time of one heating module, the power of the heating module can be smaller by dividing the conducting time of one cycle at the time of gear adjustment, for example, when the power of the heating module is 1000w, the cycle of alternating current is T, when the cycle of the heating module is T, the heating power of the heating module is 1000w when the whole T is conducted, and when 1/2T is conducted, the heating power of the heating module is 500w, and at the moment, different power gears can be output by controlling the conducting or disconnecting time of the heating module.
In the embodiment of the invention, different power gears can be output by controlling the on-off time of the heating module in the heating element, so that the experience of a user can be improved, and the device is suitable for different scene requirements.
It should be appreciated that various forms of the flows shown above may be used to reorder, add, or delete steps. For example, the steps described in the present invention may be performed in parallel, sequentially, or in a different order, so long as the desired results of the technical solution disclosed in the present invention can be achieved, and are not limited herein.
The above embodiments do not limit the scope of the present invention. It will be apparent to those skilled in the art that various modifications, combinations, sub-combinations and alternatives are possible, depending on design requirements and other factors. Any modifications, equivalent substitutions and improvements made within the principle of the present invention should be included in the protection scope of the present invention.
Claims (6)
1. The control method of the high-power heating element is characterized by comprising the following steps of:
s10, acquiring a zero-crossing signal of an alternating-current power supply through a zero-crossing detection circuit;
s20, outputting the zero crossing signal to a main control circuit;
s30, the main control circuit outputs a control signal to the bidirectional thyristor driving circuit according to the zero crossing signal;
And S40, the bidirectional thyristor driving circuit controls a load circuit according to the control signal, and the load circuit is used for controlling the heating element to be connected or disconnected, wherein the heating element comprises at least two heating modules which are connected in parallel, each heating module corresponds to one bidirectional thyristor driving circuit, and the bidirectional thyristor driving circuit preferentially ensures that the power cycle of the heating element is minimum and the maximum value of the power difference value of the heating element in the adjacent T/2 time periods before and after each zero crossing point is minimum by respectively controlling the on-off of each heating module at different moments.
2. The method for controlling a high-power heating element according to claim 1, wherein the number of the heating modules is 2, the two heating modules are a first heating module and a second heating module, the first heating module is connected in parallel with the second heating module, and the power of the first heating module is smaller than the power of the second heating module.
3. The control method of a high-power heating element according to claim 2, characterized in that the control method of the heating element further comprises:
the heating element outputs power of a plurality of gears according to the requirement of the load circuit.
4. A control method of a high-power heating element according to claim 3, wherein the power difference per adjacent gear among the powers of the plurality of gears is equal.
5. A circuit of a high-power heating element, applied to the control method of the high-power heating element as claimed in claim 1, characterized in that the circuit of the heating element comprises:
an ac power supply for supplying ac power;
the zero-crossing detection circuit is used for acquiring a zero-crossing signal of the alternating-current power supply and outputting the zero-crossing signal to the main control circuit;
the main control circuit is used for outputting a control signal to the bidirectional thyristor driving circuit according to the zero crossing signal;
The bidirectional thyristor driving circuit is used for controlling the load circuit according to the control signal;
and the load circuit is used for controlling the heating element to be connected or disconnected, wherein the heating element comprises at least two heating modules which are connected in parallel, and each heating module corresponds to one bidirectional thyristor driving circuit.
6. The circuit of a high power heating element according to claim 5, wherein the load circuit outputs different power stages by controlling the on or off time of the heating module in the heating element.
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110401987A (en) * | 2019-08-14 | 2019-11-01 | 深圳市陆海电子有限公司 | A kind of heater power conditioning circuitry and method |
| CN209731583U (en) * | 2018-11-30 | 2019-12-03 | 飞利浦（嘉兴）健康科技有限公司 | Control module and kettle for heater element |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CA3025780A1 (en) * | 2018-11-29 | 2020-05-29 | Stelpro Design Inc. | Switching control circuits having reduced conducted emi |
| CN210168239U (en) * | 2019-06-25 | 2020-03-20 | 珠海格力电器股份有限公司 | Power control circuit and heating electric appliance for reducing EMI interference |
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Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN209731583U (en) * | 2018-11-30 | 2019-12-03 | 飞利浦（嘉兴）健康科技有限公司 | Control module and kettle for heater element |
| CN110401987A (en) * | 2019-08-14 | 2019-11-01 | 深圳市陆海电子有限公司 | A kind of heater power conditioning circuitry and method |
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