CN220108252U - Electromagnetic heating circuit and electrical equipment - Google Patents
Electromagnetic heating circuit and electrical equipment Download PDFInfo
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- CN220108252U CN220108252U CN202321632424.0U CN202321632424U CN220108252U CN 220108252 U CN220108252 U CN 220108252U CN 202321632424 U CN202321632424 U CN 202321632424U CN 220108252 U CN220108252 U CN 220108252U
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- 238000010438 heat treatment Methods 0.000 title claims abstract description 37
- 238000001914 filtration Methods 0.000 claims abstract description 32
- 238000005070 sampling Methods 0.000 claims description 45
- 238000012360 testing method Methods 0.000 claims description 29
- 238000001514 detection method Methods 0.000 claims description 11
- 230000001360 synchronised effect Effects 0.000 claims description 7
- 238000013461 design Methods 0.000 abstract description 10
- 229910001006 Constantan Inorganic materials 0.000 description 4
- 241000209094 Oryza Species 0.000 description 4
- 235000007164 Oryza sativa Nutrition 0.000 description 4
- 235000009566 rice Nutrition 0.000 description 4
- 238000012546 transfer Methods 0.000 description 4
- 238000010586 diagram Methods 0.000 description 3
- 239000003990 capacitor Substances 0.000 description 2
- 238000010411 cooking Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 208000032365 Electromagnetic interference Diseases 0.000 description 1
- 230000004075 alteration Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000015556 catabolic process Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 235000013305 food Nutrition 0.000 description 1
- 230000006698 induction Effects 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 230000010355 oscillation Effects 0.000 description 1
- 230000008569 process Effects 0.000 description 1
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Abstract
The embodiment of the disclosure provides an electromagnetic heating circuit and an electrical device, comprising: the device comprises a rectification filter circuit, an inductance capacitance resonance circuit, an IGBT driving circuit and a controller; the positive electrode of the rectifying and filtering circuit is sequentially connected with the inductance-capacitance resonant circuit and the emitter of the IGBT; the negative electrode of the rectifying and filtering circuit is connected with the collector electrode of the IGBT to form a loop; the grid electrode of the IGBT is connected with the controller through an IGBT driving circuit; the IGBT driving circuit is used for controlling the on-off of the IGBT according to the control signal output by the controller so as to drive the inductance capacitance resonance circuit; wherein the pulse width of the control signal is a fixed value. The complexity of circuit design is reduced, and the cost is saved.
Description
Technical Field
The disclosure relates to the technical field of circuits, in particular to an electromagnetic heating circuit and electrical equipment.
Background
As consumers demand higher and higher electromagnetic heating (IH) home appliances (e.g., rice cookers) for cooking taste, the IH home appliances need to be provided with additional circuits (e.g., current sampling circuits) to control the power at any time in order to maintain the power stability of the IH home appliances, which not only complicates the circuit design but also increases the cost of the IH home appliances.
Disclosure of Invention
The embodiment of the disclosure provides an electromagnetic heating circuit and electrical equipment, which are used for solving the problems of complex design and high cost of the traditional electromagnetic heating circuit.
Based on the above-described problems, in a first aspect, there is provided an electromagnetic heating circuit comprising: the device comprises a rectification filter circuit, an inductance capacitance resonance circuit, an insulated gate bipolar transistor IGBT, an IGBT driving circuit and a controller;
the positive electrode of the rectifying and filtering circuit is sequentially connected with the inductance-capacitance resonant circuit and the emitter of the IGBT; the negative electrode of the rectifying and filtering circuit is connected with the collector electrode of the IGBT to form a loop;
the grid electrode of the IGBT is connected with the controller through the IGBT driving circuit; the IGBT driving circuit is used for controlling the on-off of the IGBT according to a control signal output by the controller so as to drive the inductance capacitance resonance circuit;
wherein the pulse width of the control signal is a fixed value.
In a possible implementation manner of the first aspect, the loop does not include a current sampling circuit.
In a possible implementation manner of the first aspect, the circuit further includes: a voltage sampling circuit; the voltage sampling circuit is connected with an input end of the rectifying and filtering circuit for receiving the mains supply and is connected with the pins of the controller; the controller is used for acquiring the currently input mains voltage and transmitting the currently input mains voltage to the controller; the controller is used for determining a pulse width fixed value corresponding to the current mains voltage according to the corresponding relation between the preset mains voltage and the pulse width fixed value, and determining the pulse width of the output control signal.
In a possible implementation manner of the first aspect, the correspondence between the mains voltage and the pulse width fixed value is preset based on the electromagnetic heating test circuit in the following manner: determining the current mains supply input voltage through a voltage sampling circuit of the test circuit, and transmitting the current mains supply input voltage to a first controller of the test circuit; determining current in a test loop formed by a rectifying filter circuit, the inductance-capacitance resonant circuit and the IGBT in the test circuit through a current sampling circuit of the test circuit, and transmitting the current to the first controller; the first controller determines the power of an inductance-capacitance resonance circuit in the test circuit according to the input voltage and the current; and determining the corresponding relation between the current commercial power and the pulse width of the control signal output by the first controller according to the power.
In a possible implementation manner of the first aspect, the controller includes a programmable pulse generator PPG module; the controller is connected with the signal input end of the IGBT driving circuit through a pin corresponding to the PPG module; and pins corresponding to the PPG module output control signals with fixed pulse width.
In a possible implementation manner of the first aspect, the circuit further includes: a synchronous hardware circuit; the synchronous hardware circuit is connected with two ends of the inductance-capacitance resonance circuit and is connected with the pins of the controller, and is used for sampling voltages at two ends of the inductance-capacitance resonance circuit and transmitting the results to the controller; and the controller is used for determining whether the resonance period is completed or not according to the voltages at the two ends of the inductance capacitance resonance circuit and determining the IGBT turn-on time sequence of the next period.
In a possible implementation manner of the first aspect, the circuit further includes: an electromagnetic interference filter circuit; the electromagnetic interference filter circuit is connected with the rectification filter circuit and is used for filtering the input commercial power and transmitting the commercial power to the rectification filter circuit.
In a possible implementation manner of the first aspect, the circuit further includes: a voltage surge circuit; the voltage surge circuit is connected with an input end of the rectifying and filtering circuit for receiving the mains supply and is connected with the pins of the controller; the voltage surge detection device is used for detecting voltage surges in the commercial power network and sending detection results to the controller; and the controller is used for responding to the detection result to represent that surge exists in the commercial power network and controlling to stop driving the IGBT.
In a possible implementation manner of the first aspect, the circuit further includes: a temperature sampling circuit; the temperature sampling circuit is connected with the controller pin and is used for collecting the ambient temperature and transmitting the collected temperature value to the controller; and the controller is used for determining a corresponding instruction according to the temperature value.
In a second aspect, there is provided an electromagnetic heating electrical apparatus comprising: an electromagnetic heating circuit according to the first aspect or any possible implementation manner of the first aspect.
The beneficial effects of the embodiment of the disclosure include:
an electromagnetic heating circuit and electrical equipment that this disclosed embodiment provided includes: the device comprises a rectification filter circuit, an inductance capacitance resonance circuit, an insulated gate bipolar transistor (IGBT, insulated Gate Bipolar Transistor), an IGBT driving circuit and a controller; the positive electrode of the rectifying and filtering circuit is sequentially connected with the inductance-capacitance resonant circuit and the emitter of the IGBT; the negative electrode of the rectifying and filtering circuit is connected with the collector electrode of the IGBT to form a loop; the grid electrode of the IGBT is connected with the controller through an IGBT driving circuit; the IGBT driving circuit is used for controlling the on-off of the IGBT according to the control signal output by the controller so as to drive the inductance capacitance resonance circuit; wherein the pulse width of the control signal is a fixed value. In the embodiment of the disclosure, because the electromagnetic heating circuit in the IH electric appliance works and the energy transfer model is relatively fixed, the IH electric appliance power is relatively stable, current sampling is not needed under most conditions, and the IH electric appliance power is subjected to closed-loop adjustment by adjusting the pulse width of the control signal output by the controller according to the sampling result, namely, the controller can output the control signal with the pulse width being a fixed value to the IGBT through the IGBT driving circuit, the complexity of circuit design is reduced, and the cost is saved.
Drawings
FIG. 1 is a schematic diagram of an electromagnetic heating circuit provided in an embodiment of the present disclosure;
fig. 2 is a schematic diagram of an electromagnetic heating circuit with a current sampling circuit provided in the related art.
Detailed Description
The presently disclosed embodiments provide an electromagnetic heating circuit and an electrical device, and the following description of preferred embodiments of the present disclosure with reference to the accompanying drawings, it being understood that the preferred embodiments described herein are for illustration and explanation of the present disclosure only and are not intended to limit the present disclosure. And embodiments of the utility model and features of the embodiments may be combined with each other without conflict.
An embodiment of the present disclosure provides an electromagnetic heating circuit, as shown in fig. 1, including: the device comprises a rectification filter circuit 101, an inductance capacitance resonance circuit 102, an IGBT103, an IGBT driving circuit 104 and a controller 105;
the positive electrode of the rectifying and filtering circuit 101 is sequentially connected with the inductance-capacitance resonance circuit 102 and the emitter of the IGBT 103; the negative electrode of the rectifying and filtering circuit 101 is connected with the collector electrode of the IGBT103 to form a loop;
the gate of the IGBT103 is connected to the controller 105 through the IGBT drive circuit 104; the IGBT driving circuit 104 is configured to control on-off of the IGBT103 according to a control signal output by the controller 105, so as to drive the lc resonant circuit 102;
wherein the pulse width of the control signal is a fixed value.
In the embodiment of the disclosure, the performance and parameters of the IH electric appliance (particularly an electric appliance with relatively fixed working power such as an IH rice cooker) are relatively fixed relative to the IH electric appliance (such as an electromagnetic oven) with adjustable power due to the LC resonance capacitance, the LC resonance inductance and the cookware in an LC resonance circuit. In other words, the energy transfer model is relatively fixed when the whole LC resonance electric control works, namely, a control signal with a fixed pulse width is output by the controller to drive the IGBT so as to drive the resonance circuit to work at constant power, so that a current sampling circuit is not needed to be considered in circuit design, the complexity of circuit design is reduced, and the cost of the IH electric appliance is reduced.
In addition, in the embodiment of the disclosure, the fixed value of the pulse width of the control signal may be obtained according to an actual engineering test. The target power may be determined and a value at which the pulse width of the control signal is generally stable may be determined, which value is determined as a fixed value of the pulse width of the control signal.
As shown in fig. 1, the rectifying and filtering circuit 101 may include a rectifying circuit and a filtering circuit, and the filtering circuit in fig. 1 is implemented by a filtering capacitor C1, which is only an example here, and may be implemented by other filtering circuits. Other circuit modules can be implemented by circuits with corresponding functions in the related art, and the disclosure is not limited. The positive electrode of the rectifying and filtering circuit 101 may represent the positive electrode of the direct current output after the input alternating current is converted into the direct current by the rectifying and filtering circuit 101, and similarly, the negative electrode of the rectifying and filtering circuit 101 may represent the negative electrode of the direct current output after the input alternating current is converted into the direct current by the rectifying and filtering circuit 101. The coil in LC resonant circuit 102 corresponds to an inductance such that the electrical energy resonates between the coil and the resonant capacitor C2 and transfers energy to the cookware where eddy current effects occur to generate heat.
In yet another embodiment provided by the present disclosure, the loop described above does not include a current sampling circuit.
In this embodiment, fig. 2 is a schematic diagram of an electromagnetic heating circuit with a current sampling circuit provided in the related art. As shown in fig. 2, the circuit formed by the rectifying and filtering circuit 201, the LC resonant circuit 202, and the IGBT203 further includes a current sampling circuit 207, wherein both ends of the constantan wire R1 are connected to the negative electrode of the rectifying and filtering circuit and the collector of the IGBT, respectively. When the IGBT203 is in the connected state, the large current flows to the rectifying and filtering circuit 201 through the constantan wire R1, and finally summarized to the ground, and a forward triangular wave current is formed on the right side of the constantan wire R1, and the current enters the controller 205 through the filtering circuit R2/C3 outside the controller 205, so as to complete high-frequency forward current sampling.
As can be seen, in the related art, a circuit formed by the rectifying and filtering circuit 201, the LC resonant circuit 202, and the IGBT203 includes a current sampling circuit 207, and the controller 205 samples the current in the circuit through the current sampling circuit 207 and samples the voltage through the voltage sampling circuit 206, so as to obtain the working power of the LC resonant circuit (for heating the pot), and adjust the pulse width value of the control signal sent to the IGBT at any time according to the change of the power, so as to ensure the stability of the working power. However, as described above, since the performance and parameters of the IH electric appliance (especially for the electric appliance with relatively fixed working power such as the IH rice cooker) are relatively fixed, that is, the energy transfer model of the whole LC resonance electric control working is relatively fixed, the LC resonance circuit can be driven by a control signal with a fixed pulse width in general, that is, the power is controlled in an open loop manner, so that the current sampling circuit 207 is not considered in the circuit design, and the constantan wire R1 and the filter circuit R2/C3 are not required, thereby reducing the complexity of the circuit design and the cost of the IH electric appliance.
In addition, fig. 1 and 2 are only schematic, and not limiting of the disclosure, and other devices may be used to implement the functions of the circuit of fig. 1 and 2, which are also within the scope of the disclosure.
In yet another embodiment provided by the present disclosure, as shown in fig. 1, the electromagnetic heating circuit further includes: a voltage sampling circuit 106;
the voltage sampling circuit 106 is connected with an input end of the rectifying and filtering circuit 101 for receiving the mains supply and is connected with a pin of the controller 105; the controller 105 is used for acquiring the currently input mains voltage and transmitting the currently input mains voltage to the mains voltage;
and a controller 105, configured to determine a pulse width fixed value corresponding to the current mains voltage according to a preset correspondence between the mains voltage and the pulse width fixed value, and determine the pulse width of the output control signal.
In the present embodiment, although a fixed value of the control signal pulse width is determined through engineering tests according to the target power, the target power may be unstable due to instability of the utility voltage, and thus, in order to ensure stability of the output power in the case of instability of the utility voltage, the voltage sampling circuit 106 may be configured to output fixed pulse widths corresponding to different utility voltages, respectively, for different utility voltages.
This requires that the fixed pulse width for the different mains voltages be predetermined and stored. After the controller 105 obtains the current mains voltage, a fixed pulse width corresponding to the current mains voltage may be determined according to the stored correspondence relationship, thereby adjusting the pulse width of the output control signal.
In still another embodiment provided by the present disclosure, referring to fig. 2, the correspondence between the mains voltage and the pulse width fixed value is preset based on the electromagnetic heating test circuit in the following manner:
determining the current mains supply input voltage through a voltage sampling circuit of the test circuit, and transmitting the current mains supply input voltage to a first controller of the test circuit;
determining current in a test loop formed by a rectifying filter circuit, an inductance-capacitance resonance circuit and an IGBT in the test circuit through a current sampling circuit of the test circuit, and transmitting the current to a first controller;
the first controller determines the power of an inductance-capacitance resonance circuit in the test circuit according to the input voltage and current;
and determining the corresponding relation between the current mains supply input voltage and the pulse width of the output control signal of the first controller according to the determined power.
In this embodiment of the disclosure, the electromagnetic heating test circuit may be set with reference to fig. 2, where the electromagnetic heating circuit with current sampling current may correspond to 206 in fig. 2, the first controller may correspond to 205 in fig. 2, the current sampling circuit of the test circuit may correspond to 207 in fig. 2, the rectifying filter circuit of the test circuit may correspond to 201 in fig. 2, the lc resonant circuit of the test circuit may correspond to 202 in fig. 2, and the IGBT of the test circuit may correspond to 203 in fig. 2.
In the embodiment of the disclosure, different working powers corresponding to different mains supply input voltages can be determined in advance through an electromagnetic heating test circuit with a current sampling circuit in a closed loop mode, and the corresponding relation between the different mains supply input voltages and the pulse widths is determined according to different pulse widths corresponding to the different working powers. In the embodiment of the IH electrical product, as the correspondence between the different mains input voltages and the pulse width has been obtained in advance, each different mains voltage has a fixed pulse width of the corresponding control signal. The pulse width of the output control signal can be directly determined according to the mains supply input voltage, the working power of the LC resonant circuit is not required to be detected in a closed loop mode, and the pulse width of the control signal is adjusted through the power, so that a current sampling circuit is not required to be arranged in an IH electric appliance circuit, the complexity of circuit design is reduced, and the cost is saved.
In addition, in the embodiment of the present disclosure, when the controller processes the voltage signal or the current signal transmitted by the voltage sampling module or the current sampling module, modules such as analog-to-digital (AD) conversion may be set as required, and the signals may be converted into signals that can be processed by the controller, which is not described herein.
In yet another embodiment provided by the present disclosure, as shown in fig. 1, the controller 105 includes: a programmable pulse generator (PPG, programmable Pulse Generator) module;
the controller 105 is connected with the signal input end of the IGBT driving circuit 104 through pins corresponding to the PPG module; the pins corresponding to the PPG module output control signals with fixed pulse width.
In this embodiment, the controller 105 may be implemented by a microcontroller (MCU, micro Controller Unit). Pins of the MCU, corresponding to the PPG module, are connected with the IGBT driving circuit 104, and output control signals with fixed pulse width to the IGBT driving circuit 104 so as to drive the on-off of the IGBT103 through the IGBT driving circuit 104.
In yet another embodiment provided by the present disclosure, as shown in fig. 1, the electromagnetic heating circuit further includes: a synchronization hardware circuit 107;
the synchronous hardware circuit 107 is connected with two ends of the inductance-capacitance resonance circuit 102 and is connected with a pin of the controller 105, and is used for sampling voltages at two ends of the inductance-capacitance resonance circuit 102 and transmitting the results to the controller 105;
and the controller 105 is used for determining whether the resonance period is completed or not according to the voltages at two ends of the inductance capacitance resonance circuit 102, and determining the IGBT turn-on time sequence of the next period.
In the embodiment of the disclosure, in order to realize reliable operation of the IGBT103, the circuit needs to design a synchronous circuit, so that the IGBT is ensured to be turned on at zero voltage, the circuit system is more reliable, and the heat loss is smaller. That is, the synchronous hardware circuit 107 may sample the operation state of the LC resonant circuit 102, and after the controller 105 determines that the current oscillation is completed, the IGBT103 may be driven next time.
In yet another embodiment provided by the present disclosure, as shown in fig. 1, the electromagnetic heating circuit further includes: an electromagnetic interference filter circuit 108;
the electromagnetic interference filter circuit 108 is connected to the rectifying filter circuit 101, and is configured to filter the input commercial power and transmit the filtered commercial power to the rectifying filter circuit 101.
In the implementation of the present disclosure, in order to prevent mutual interference between the utility power grid and the IH heating circuit, an electromagnetic interference filter circuit (EMI, electro Magnetic Interference) 108 may be added between the utility power interface and the IH electromagnetic heating circuit, and the electromagnetic interference filter circuit may effectively inhibit propagation of interference.
In yet another embodiment provided by the present disclosure, as shown in fig. 1, the electromagnetic heating circuit further includes: a voltage surge circuit 109;
the voltage surge circuit 109 is connected with an input end of the rectifying and filtering circuit 101 for receiving the commercial power and is connected with a pin of the controller 105; the voltage surge detection device is used for detecting voltage surges in the commercial power network and sending detection results to the controller 105;
and the controller 105 is used for responding to the received detection result to represent that surge exists in the commercial power network and controlling to stop driving the IGBT 103.
In this embodiment, since the commercial power supply is usually not a pure 220V ac voltage, voltage fluctuation, i.e. surge voltage, often occurs, and the voltage surge circuit 109 is mainly used to prevent the IGBT103 from being still in a connected state when the voltage surge fluctuates, which further leads to overvoltage or overcurrent breakdown of the IGBT 103. Therefore, the detection result of the surge by the voltage surge circuit 109 is received by the controller 105, and the on-off of the IGBT103 is controlled according to the detection result.
In yet another embodiment provided by the present disclosure, as shown in fig. 1, the electromagnetic heating circuit further includes: a temperature sampling circuit 110;
the temperature sampling circuit 110 is connected with a pin of the controller 105, and is used for collecting a preset environmental temperature and transmitting the collected temperature value to the controller 105;
and a controller 105 for determining a corresponding instruction from the received temperature value.
In the present embodiment, the temperature sampling circuit 110 may be implemented by a temperature sensor or the like, which is not limited herein. In implementation, the temperature sampling circuit 110 may be set for the environment of interest, for example, the working temperature of the IGBT103 may be monitored, so as to avoid damage caused by the excessive temperature of the IGBT103, that is, when the controller 105 detects that the temperature of the IGBT103 reaches the first temperature threshold, a corresponding IGBT turn-off instruction may be sent. For example, the temperature in the pan acted by the LC resonant circuit 102 may be monitored to ensure the taste of the cooked food in the pan, that is, when the controller 105 detects that the temperature in the pan does not meet the preset condition, the controller may send a corresponding instruction to stop cooking, etc.
The embodiment of the disclosure also provides an electromagnetic heating electrical apparatus, including: the electromagnetic heating circuit of any of the above embodiments.
In the embodiment of the present disclosure, an electromagnetic heating (IH) appliance may include an appliance of an electric rice cooker, an induction cooker, or the like, which is heated by electromagnetic waves.
Those skilled in the art will appreciate that the drawings are merely schematic representations of one preferred embodiment, and that the components in the drawings are not necessarily required to practice the present disclosure.
Those skilled in the art will appreciate that circuit blocks in the embodiments may be distributed throughout circuits of the embodiments as described in the embodiments, and that corresponding variations may be located in one or more circuits different from the present embodiments. The circuit modules in the above embodiments may be combined into one circuit module, or may be further split into a plurality of sub-circuit modules.
The order of the embodiments of the disclosure described above is merely for illustration and does not represent the advantages or disadvantages of the embodiments.
It will be apparent to those skilled in the art that various modifications and variations can be made to the present disclosure without departing from the spirit or scope of the disclosure. Thus, the present disclosure is intended to include such modifications and alterations insofar as they come within the scope of the appended claims or the equivalents thereof.
Claims (10)
1. An electromagnetic heating circuit, comprising: the device comprises a rectification filter circuit, an inductance capacitance resonance circuit, an insulated gate bipolar transistor IGBT, an IGBT driving circuit and a controller;
the positive electrode of the rectifying and filtering circuit is sequentially connected with the inductance-capacitance resonant circuit and the emitter of the IGBT; the negative electrode of the rectifying and filtering circuit is connected with the collector electrode of the IGBT to form a loop;
the grid electrode of the IGBT is connected with the controller through the IGBT driving circuit; the IGBT driving circuit is used for controlling the on-off of the IGBT according to a control signal output by the controller so as to drive the inductance capacitance resonance circuit;
wherein the pulse width of the control signal is a fixed value.
2. The circuit of claim 1, wherein the loop does not include a current sampling circuit.
3. The circuit of claim 1 or 2, further comprising: a voltage sampling circuit;
the voltage sampling circuit is connected with an input end of the rectifying and filtering circuit for receiving the mains supply and is connected with the pins of the controller; the controller is used for acquiring the currently input mains voltage and transmitting the currently input mains voltage to the controller;
the controller is used for determining a pulse width fixed value corresponding to the current mains voltage according to the corresponding relation between the preset mains voltage and the pulse width fixed value, and determining the pulse width of the output control signal.
4. A circuit according to claim 3, wherein the correspondence between the mains voltage and the pulse width fixed value is preset based on the electromagnetic heating test circuit in the following manner:
determining the current mains supply input voltage through a voltage sampling circuit of the test circuit, and transmitting the current mains supply input voltage to a first controller of the test circuit;
determining current in a test loop formed by a rectifying filter circuit, the inductance-capacitance resonant circuit and the IGBT in the test circuit through a current sampling circuit of the test circuit, and transmitting the current to the first controller;
the first controller determines the power of an inductance-capacitance resonance circuit in the test circuit according to the input voltage and the current;
and determining the corresponding relation between the current commercial power and the pulse width of the control signal output by the first controller according to the power.
5. A circuit as claimed in claim 1 or 2, wherein the controller comprises a programmable pulse generator PPG module;
the controller is connected with the signal input end of the IGBT driving circuit through a pin corresponding to the PPG module; and pins corresponding to the PPG module output control signals with fixed pulse width.
6. The circuit of claim 1 or 2, wherein the circuit further comprises: a synchronous hardware circuit;
the synchronous hardware circuit is connected with two ends of the inductance-capacitance resonance circuit and is connected with the pins of the controller, and is used for sampling voltages at two ends of the inductance-capacitance resonance circuit and transmitting the results to the controller;
and the controller is used for determining whether the resonance period is completed or not according to the voltages at the two ends of the inductance capacitance resonance circuit and determining the IGBT turn-on time sequence of the next period.
7. The circuit of claim 1 or 2, wherein the circuit further comprises: an electromagnetic interference filter circuit;
the electromagnetic interference filter circuit is connected with the rectification filter circuit and is used for filtering the input commercial power and transmitting the commercial power to the rectification filter circuit.
8. The circuit of claim 1 or 2, wherein the circuit further comprises: a voltage surge circuit;
the voltage surge circuit is connected with an input end of the rectifying and filtering circuit for receiving the mains supply and is connected with the pins of the controller; the voltage surge detection device is used for detecting voltage surges in the commercial power network and sending detection results to the controller;
and the controller is used for responding to the detection result to represent that surge exists in the commercial power network and controlling to stop driving the IGBT.
9. The circuit of claim 1 or 2, wherein the circuit further comprises: a temperature sampling circuit;
the temperature sampling circuit is connected with the controller pin and is used for collecting the ambient temperature and transmitting the collected temperature value to the controller;
and the controller is used for determining a corresponding instruction according to the temperature value.
10. An electromagnetic heating electrical apparatus, comprising: an electromagnetic heating circuit as claimed in any one of claims 1 to 9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321632424.0U CN220108252U (en) | 2023-06-26 | 2023-06-26 | Electromagnetic heating circuit and electrical equipment |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321632424.0U CN220108252U (en) | 2023-06-26 | 2023-06-26 | Electromagnetic heating circuit and electrical equipment |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN220108252U true CN220108252U (en) | 2023-11-28 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202321632424.0U Active CN220108252U (en) | 2023-06-26 | 2023-06-26 | Electromagnetic heating circuit and electrical equipment |
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| Country | Link |
|---|---|
| CN (1) | CN220108252U (en) |
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2023
- 2023-06-26 CN CN202321632424.0U patent/CN220108252U/en active Active
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