Electromagnetic heating drive controller and drive control method

Abstract

The application relates to the technical field of electronic circuits, and discloses an electromagnetic heating driving controller and a driving control method. The electromagnetic heating driving controller comprises a driving module and a control module; the driving output end of the driving module is connected with the G pole of an IGBT; the driving module drives the IGBT to be turned on or turned off by outputting a driving signal to the IGBT; the control module has a signal input end and a control output end; the control module receives an IGBT working parameter through the signal input end and generates a corresponding control signal, and outputs the control signal to the driving module through the control output end; when the driving module receives the control signal, the driving signal is generated, so that the average voltage of the rising edge driving signal in the starting stage is negatively correlated with the IGBT working parameter. In the protection of overcurrent or overvoltage of the IGBT, the IGBT loss is reduced, the IGBT temperature rise is reduced, and the stable operation of the electromagnetic heating cooking utensil is ensured.

Description

Technical Field

[0001] This invention relates to the field of electronic circuit technology, and in particular to an electromagnetic heating drive controller and drive control method. Background Technology

[0002] Insulated-gate bipolar transistors (IGBTs) are widely used in medium- and high-power electrical appliances, such as induction cookers, due to their high current capacity, voltage withstand capability, low conduction losses, and low static drive power. To ensure proper and effective protection against current or voltage fluctuations, protection functions are integrated into the drive circuit. However, current technology's IGBT protection mechanism involves shutting off the input power supply, which affects the appliance's performance. Summary of the Invention

[0003] The purpose of this invention is to provide an electromagnetic heating drive controller and drive control method, which aims to solve the technical problem of how to balance the protection of IGBTs and the maintenance of the electrical performance.

[0004] In a first aspect, an electromagnetic heating drive controller is provided, comprising:

[0005] The drive module has its drive output terminal connected to the gate (G) of the IGBT. The drive module outputs a drive signal to the IGBT to turn the IGBT on or off.

[0006] The control module has a signal input terminal and a control output terminal. The control module receives the IGBT operating parameters through the signal input terminal and generates the corresponding control signal, and outputs the control signal to the drive module through the control output terminal.

[0007] The IGBT operating parameters include at least the collector voltage and / or collector current. When the drive module receives the control signal, it generates a drive signal, such that the average voltage of the drive signal on the rising edge during the startup phase is negatively correlated with the IGBT operating parameters.

[0008] In some embodiments, the control module generates a corresponding control signal based on the IGBT operating parameters, and the drive module generates a drive signal based on the control signal, so that the amplitude of the drive signal at the rising edge during the startup phase is positively correlated with the IGBT operating parameters.

[0009] In some embodiments, the electromagnetic heating drive controller further includes:

[0010] The detection module is connected to the collector (C) terminal of the IGBT, samples the collector voltage, and outputs the obtained voltage sampling signal to the control module.

[0011] The control module receives the voltage sampling signal and generates a control signal, which causes the drive module to generate a drive signal when it receives the control signal.

[0012] In some embodiments, the detection module includes a first comparison unit and a second comparison unit;

[0013] The first comparison unit is connected to the collector (C) terminal of the IGBT, samples the collector voltage and compares it with the first reference source, and outputs the comparison result to the control module.

[0014] The second comparison unit is connected to the collector (C) terminal of the IGBT, samples the collector voltage and compares it with the second reference source, and outputs the comparison result to the control module.

[0015] The voltage values ​​of the first reference source are different from those of the second reference source.

[0016] In some embodiments, the detection module samples the collector voltage and outputs the obtained voltage sampling signal to the drive module;

[0017] The control module receives the voltage sampling signal and generates a control signal, which enables the drive module to generate a drive signal based on the control signal or based on the voltage sampling signal.

[0018] In a second aspect, an electromagnetic heating cooking appliance is provided, including an electromagnetic heating drive controller as described in the first aspect.

[0019] Thirdly, a driving control method for an IGBT in an electromagnetic heating cooking appliance is provided. The electromagnetic heating cooking appliance includes a driving module and a control module. The driving output terminal of the driving module is connected to the gate (G) terminal of the IGBT, and the control module has a signal input terminal and a control output terminal. The driving control method includes the following steps:

[0020] The control module receives IGBT operating parameters through the signal input terminal and generates corresponding control signals, and outputs control signals to the drive module through the control output terminal.

[0021] When the drive module receives a control signal, it generates a drive signal. The drive module then outputs the drive signal to the IGBT to drive the IGBT to turn on or off.

[0022] The IGBT operating parameters include at least the collector voltage and / or collector current, and the average voltage of the drive signal is negatively correlated with the IGBT operating parameters.

[0023] In some embodiments, the control module generates a corresponding control signal based on the IGBT operating parameters, and the drive module generates a drive signal based on the control signal, so that the amplitude of the drive signal is positively correlated with the IGBT operating parameters.

[0024] In some embodiments, the control module generates a corresponding control signal based on the IGBT operating parameters, and the drive module generates a drive signal based on the control signal, including:

[0025] The control module determines whether the IGBT operating parameters are within the preset parameter range;

[0026] If not, the control module outputs the configured control signal, configures the rise time and / or starting voltage of the drive signal according to the control signal, and the drive module outputs the configured drive signal; wherein, the rise time and / or starting voltage of the drive signal are negatively correlated with the IGBT operating parameters.

[0027] In some embodiments, the control module generates a corresponding control signal based on the IGBT operating parameters, and the drive module generates a drive signal based on the control signal, including:

[0028] The control module determines whether the IGBT operating parameters are within the preset parameter range;

[0029] If not, the control module outputs a control signal, causing the drive module to configure the rise time and / or starting voltage of the drive signal based on the voltage sampling signal obtained by sampling the C-terminal voltage and output the configured drive signal; wherein, the rise time and / or starting voltage of the drive signal are negatively correlated with the IGBT operating parameters.

[0030] The beneficial effects of the present invention are as follows: by receiving the drive signal output by the IGBT operating parameter adjustment drive module 10, the average voltage of the drive signal is negatively correlated with the IGBT operating parameters, so as to drive the IGBT to turn on or off. Thus, when the IGBT operating parameters reach or approach the protection threshold, the IGBT operating parameters can be further constrained. When protecting the IGBT from overcurrent or overvoltage, there is no need to directly turn off the input power supply, thus ensuring the stable operation of the electromagnetic heating cooking appliance. Attached Figure Description

[0031] Figure 1 This is a schematic diagram of the electromagnetic heating drive controller provided in the first embodiment.

[0032] Figure 2 This is a schematic diagram of the electromagnetic heating drive controller provided in the second embodiment.

[0033] Figure 3 This is a schematic diagram of the electromagnetic heating drive controller provided in the third embodiment.

[0034] Figure 4 This is a flowchart of a driving control method for an IGBT in an electromagnetic heating cooking appliance, provided in one embodiment.

[0035] Figure 5 This is a flowchart of step S402 provided in the first embodiment.

[0036] Figure 6 This is a flowchart of step S402 provided in the second embodiment.

[0037] Figure 7 This is a schematic diagram of the waveform of the drive signal before modulation provided in one embodiment.

[0038] Figure 8 This is a waveform diagram of the modulated drive signal provided in one embodiment. Detailed Implementation

[0039] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the present invention will be further described below in conjunction with the embodiments and accompanying drawings.

[0040] In embodiments of the present invention, "several" means an indefinite quantity, "multiple" means two or more, "greater than," "less than," and "exceeding" are understood to exclude the stated number, while "above," "below," and "within" are understood to include the stated number. Any descriptions of "first" and "second" are merely for distinguishing technical features and should not be construed as indicating or implying relative importance, or implicitly indicating the number of indicated technical features, or implicitly indicating the order of the indicated technical features.

[0041] In embodiments of the invention, the terms “comprising,” “including,” or any other variations thereof are intended to cover non-exclusive inclusion, which includes not only the elements listed but also other elements not expressly listed.

[0042] In related technologies, Insulated Gate Bipolar Transistors (IGBTs) are widely used in medium and high power converters, such as in induction cookers, due to their high current capacity and voltage withstand capability, low conduction loss, and low static drive power. The function of the IGBT drive circuit is to convert the switching signal from the microcontroller into a drive pulse signal with sufficient power to ensure reliable IGBT turn-off and on. Simultaneously, the IGBT drive circuit also provides safe electrical isolation between the microcontroller and the power transistor. To ensure proper and effective protection against current or voltage fluctuations in the IGBT, protection functions are also integrated into the drive circuit. However, existing IGBT drive circuits only shut off the input power supply for overcurrent or overvoltage protection, affecting the performance of the appliance.

[0043] Based on this, embodiments of the present invention provide an electromagnetic heating drive controller, an electromagnetic heating cooking appliance having the electromagnetic heating drive controller, and a drive control method for the IGBT in the electromagnetic heating cooking appliance.

[0044] In embodiments of the present invention, the electromagnetic heating cooking appliance can be an electromagnetic rice cooker, an electromagnetic pressure cooker, or other electromagnetic heating products.

[0045] According to a first aspect of the present invention, an electromagnetic heating drive controller is provided.

[0046] like Figure 1 As shown, the electromagnetic heating drive controller includes a drive module 10 and a control module 20.

[0047] The drive module 10 has its drive output terminal connected to the gate (G) of the IGBT. The drive module 10 outputs a drive signal to the IGBT to turn it on or off. The control module 20 has a signal input terminal and a control output terminal. The control module 20 receives the IGBT operating parameters through the signal input terminal and generates a corresponding control signal (e.g., a PPG pulse), and outputs the control signal to the drive module 10 through the control output terminal. The IGBT operating parameters include at least the collector voltage and / or collector current. When the drive module 10 receives the control signal, it generates a drive signal such that the average voltage of the rising edge drive signal during the startup phase is negatively correlated with the IGBT operating parameters.

[0048] Specifically, during the operation of the electromagnetic heating cooking appliance, the control module 20 outputs corresponding control signals to the drive module 10 via the signal input terminal and the control output terminal, and also receives the IGBT operating parameters. When the drive module 10 receives the control signal, it converts the control signal output by the control module 20 to generate a drive signal.

[0049] For example, the drive module 10 can convert the +5V level signal output by the control module 20 into a rising edge drive signal with an average voltage of 14V, and output this drive signal to the IGBT to control the IGBT to turn on or off, so that the IGBT controls the corresponding resonant module to resonate. The control module 20 outputs a control signal, thereby controlling the drive module 10 to generate a modulated drive signal when it receives the control signal. The amplitude of the modulated drive signal is positively correlated with the IGBT operating parameters.

[0050] Based on this, the control module 20 outputs a control signal to the drive module 10, and adjusts the average voltage of the drive signal output by the drive module 10 by receiving the IGBT operating parameters, so that the average voltage of the rising edge drive signal during the startup phase is negatively correlated with the IGBT operating parameters, thereby controlling the IGBT to turn on or off. This allows the IGBT operating parameters to be further constrained when they reach or approach the protection threshold. When protecting the IGBT from overcurrent or overvoltage, there is no need to directly shut off the input power supply, ensuring the stable operation of the electromagnetic heating cooking appliance.

[0051] Furthermore, according to one embodiment of the present invention, the control module 20 generates a corresponding control signal based on the IGBT operating parameters, so that the drive module 10 generates a drive signal based on the control signal, so that the amplitude of the rising edge drive signal during the startup phase is positively correlated with the IGBT operating parameters.

[0052] Specifically, when the control module 20 receives the IGBT operating parameters, it adjusts the previously output control signal according to the received IGBT operating parameters, and then outputs the adjusted control signal to the drive module 10. During the process of the control module 20 controlling the drive module 10 to generate the drive signal, it adjusts the rise time and / or starting voltage of the drive signal to increase or decrease the amplitude of the drive signal, so that the average voltage of the rising edge drive signal during the startup phase is negatively correlated with the IGBT operating parameters.

[0053] For example, during the startup phase, when the control module 20 receives a collector voltage exceeding a preset voltage threshold, the control module 20 determines that the collector voltage is too high. At this point, the control module 20 can first reduce the pulse width or duty cycle of the previously output control signal, and then output the adjusted control pulse to the drive module 10. The drive module 10, receiving the adjusted control pulse, can either lower the starting voltage of the previously output drive signal while keeping the ending voltage unchanged, or keep both the starting and ending voltages of the previously output drive signal unchanged while lowering the rise time, thereby making the average voltage of the drive signal negatively correlated with the IGBT operating parameters. Based on this, the IGBT operating parameters can be fed back to the control module 20 through a feedback mechanism, allowing the control module 20 to adjust the drive signal, thereby reducing the probability of IGBT damage and improving reliability.

[0054] like Figure 7 As shown, the drive signal before modulation is a square wave. The waveform of the drive signal before modulation does not change with the IGBT operating parameters. The starting voltage and ending voltage of the drive signal are the same during the startup phase, and both the starting voltage and ending voltage are V0.

[0055] like Figure 8 The control module 20 modulates the drive signal according to the IGBT operating parameters (such as the collector voltage), and sets the start voltage, end voltage, and rise time of the drive signal based on the IGBT operating parameters (such as the collector voltage). When the collector voltage rises during the start-up phase, the start voltage of the drive signal decreases to V1 during the rising edge control phase, and the end voltage remains at V0, with a rise time of T1. During the falling edge control phase, the start voltage of the drive signal decreases to V1, and the end voltage remains at V0, with a rise time of T1. The voltage of the drive signal decreases from V0 to V2 during the falling time of T2, and then from V2 to V1 during the falling time of T3. That is, the voltage drop of the drive signal first passes through a secondary voltage phase before decreasing to a level lower than the voltage required to turn on the IGBT, which slows down the rate of decrease of the drive signal, reduces EMI interference, IGBT switching losses, and IGBT temperature rise, and improves the energy efficiency of electromagnetic heating cooking appliances.

[0056] In one specific embodiment of the present invention, such as Figure 2As shown, the electromagnetic heating drive controller also includes a detection module 30. The detection module 30 is connected to the collector (C) terminal of the IGBT. The detection module 30 samples the collector voltage and outputs the obtained voltage sampling signal to the control module 20. The control module 20 receives the voltage sampling signal and generates a control signal, causing the drive module 10 to generate a drive signal upon receiving the control signal.

[0057] In this embodiment, the detection module 30 is connected to the collector (C) terminal of the IGBT, samples the C terminal voltage, and converts it into a reverse voltage detection signal. After the control module 20 receives the reverse voltage detection signal, it determines the C terminal voltage value based on the waveform or voltage value of the reverse voltage detection signal. When the C terminal voltage value increases, the control module 20 lowers the average voltage of the drive signal by outputting a corresponding control signal. Conversely, when the C terminal voltage value decreases, the control module 20 raises the average voltage of the drive signal by outputting a corresponding control signal, so that the C terminal voltage is maintained within a stable range.

[0058] Specifically, the detection module 30 includes a first comparison unit 31 and a second comparison unit 32. The first comparison unit 31 is connected to the collector (C) terminal of the IGBT, samples the collector voltage and compares it with a first reference source, and outputs the comparison result to the control module 20; the second comparison unit 32 is connected to the collector (C) terminal of the IGBT, samples the collector voltage and compares it with a second reference source, and outputs the comparison result to the control module 20; the voltage values ​​of the first reference source and the second reference source are different.

[0059] One input terminal of the first comparison unit 31 is connected to the collector (C) terminal of the IGBT, and the other input terminal is connected to a first reference source. The first comparison unit 31 compares the collector voltage with the first reference source and outputs a signal with the larger voltage value as the surge detection signal. When the surge detection signal is the first reference source, the collector voltage decreases, and the control module 20 increases the starting voltage of the drive signal. When the surge detection signal is the collector voltage, the collector voltage increases, and the control module 20 decreases the starting voltage of the drive signal.

[0060] One input terminal of the second comparator module is connected to the collector (C) terminal of the IGBT, and the other input terminal is connected to a second reference source. The second comparator module compares the collector voltage with the second reference source and outputs the signal with the larger voltage value as the surge detection signal. When the surge detection signal is the second reference source, the collector voltage decreases, and the control module 20 increases the starting voltage of the drive signal. When the surge detection signal is the collector voltage, the collector voltage increases, and the control module 20 decreases the starting voltage of the drive signal.

[0061] The voltage values ​​of the first reference source and the second reference source are different. When the control module 20 controls the IGBT device based on the reverse voltage detection signal output by the first comparison unit 31 and the reverse voltage detection signal output by the second comparison module, it limits the collector voltage between the voltage values ​​of the first reference source and the second reference source, so that the collector voltage is maintained within a stable range.

[0062] In another specific embodiment of the present invention, such as Figure 3 As shown, the detection module 30 samples the collector voltage and outputs the obtained voltage sampling signal to the drive module 10. The control module 20 receives the voltage sampling signal and generates a control signal, so that the drive module 10 generates a drive signal based on the control signal or based on the voltage sampling signal.

[0063] In this embodiment, for the C-terminal voltage control, the detection module 30 directly outputs a reverse voltage detection signal to the drive module 10, and the drive module 10 directly outputs an edge control signal based on the reverse voltage detection signal.

[0064] Specifically, the detection module 30 is connected to the collector (C) terminal of the IGBT, samples the C terminal voltage and converts it into a reverse voltage detection signal. After the drive module 10 receives the reverse voltage detection signal, it determines the C terminal voltage value based on the waveform or voltage value of the reverse voltage detection signal. When the C terminal voltage value increases, the drive module 10 lowers the average voltage of the drive signal. Conversely, when the C terminal voltage value decreases, the control module 20 raises the average voltage of the drive signal to keep the C terminal voltage within a stable range.

[0065] In summary, the electromagnetic heating drive controller according to the embodiment of the present invention receives the drive signal output by the IGBT operating parameter adjustment drive module 10, and makes the average voltage of the drive signal negatively correlated with the IGBT operating parameters to drive the IGBT to turn on or off. Thus, when the IGBT operating parameters reach or approach the protection threshold, the IGBT operating parameters can be further constrained. When protecting the IGBT from overcurrent or overvoltage, there is no need to directly shut off the input power supply, ensuring the stable operation of the electromagnetic heating cooking appliance.

[0066] According to a second aspect of the present invention, an electromagnetic heating cooking appliance is provided.

[0067] The electromagnetic heating cooking appliance includes an electromagnetic heating drive controller as described in the first aspect. With the electromagnetic heating drive controller, when the IGBT operating parameters reach or approach the protection threshold, the IGBT operating parameters can be further constrained. When the IGBT is protected against overcurrent or overvoltage, the input power supply does not need to be directly shut off, thus ensuring the stable operation of the electromagnetic heating cooking appliance.

[0068] The specific structure of the electromagnetic heating drive controller is as described in the above embodiments. Since the electromagnetic heating cooking appliance of the second aspect of the present invention adopts all the technical solutions of all the above embodiments, it has at least all the beneficial effects brought about by the technical solutions of the above embodiments, and will not be described in detail here.

[0069] According to a third aspect of the present invention, a method for driving and controlling an IGBT in an electromagnetic heating cooking appliance is provided.

[0070] In embodiments of the present invention, such as Figure 1 As shown, the electromagnetic heating cooking appliance includes a drive module 10 and a control module 20. The drive output terminal of the drive module 10 is connected to the gate (G) of the IGBT, and the control module 20 has a signal input terminal and a control output terminal.

[0071] like Figure 4 As shown, the drive control method includes the following steps:

[0072] In step S401, the control module receives the IGBT operating parameters through the signal input terminal and generates the corresponding control signal, and outputs the control signal to the drive module through the control output terminal.

[0073] In step S402, when the drive module receives the control signal, it generates a drive signal and outputs the drive signal to the IGBT to drive the IGBT to turn on or off.

[0074] The IGBT operating parameters include at least the collector voltage and / or collector current, and the average voltage of the drive signal is negatively correlated with the IGBT operating parameters.

[0075] Furthermore, according to one embodiment of the present invention, the control module generates a corresponding control signal based on the IGBT operating parameters, and the drive module generates a drive signal based on the control signal, so that the rise time and / or starting voltage of the drive signal are positively correlated with the IGBT operating parameters.

[0076] In embodiments of the present invention, electromagnetic heating cooking appliances may include electromagnetic rice cookers and electromagnetic pressure cookers.

[0077] It should be noted that for details not disclosed in the IGBT drive control method of the electromagnetic heating cooking appliance in the embodiments of the present invention, please refer to the details disclosed in the electromagnetic heating drive controller in the first aspect of the embodiments of the present invention, which will not be described in detail here.

[0078] like Figure 5 As shown, according to an embodiment of the present invention, step S402 specifically includes:

[0079] Step S501: The control module determines whether the IGBT operating parameters are within the preset parameter range. If yes, proceed to step S502; otherwise, proceed to step S503.

[0080] In step S502, the control module outputs a preset control signal, causing the drive module to output a preset drive signal.

[0081] In step S503, the control module outputs the configured control signal, configures the rise time and / or starting voltage of the drive signal according to the control signal, and the drive module outputs the configured drive signal.

[0082] Among them, the rise time and / or starting voltage of the drive signal are negatively correlated with the IGBT operating parameters.

[0083] In step S501, the control module compares the received IGBT operating parameters with preset parameter range values ​​and outputs the corresponding control signal based on the comparison result. For example, when the IGBT operating parameters are within the preset parameter range, the preset control signal is used; when the IGBT operating parameters are outside the preset parameter range, the configured control signal is used.

[0084] In step S502, when the control module outputs a preset control signal, the drive module outputs a preset drive signal according to the preset control signal. The IGBT receives the preset drive signal and turns on normally, energizing under normal conditions.

[0085] In step S503, when the control module configures the control signal, it makes the rise time and / or starting voltage of the configured control signal negatively correlated with the IGBT operating parameters, so that the rise time and / or starting voltage of the drive signal output by the drive module when receiving the control signal are also negatively correlated with the IGBT operating parameters.

[0086] like Figure 6 As shown, according to an embodiment of the present invention, step S402 specifically includes:

[0087] In step S601, the control module determines whether the IGBT operating parameters are within the preset parameter range. If yes, proceed to step S502; otherwise, proceed to step S503.

[0088] In step S602, the control module outputs a preset control signal, which causes the drive module to receive the voltage sampling signal and then output a preset drive signal.

[0089] In step S603, the control module outputs a control signal, causing the drive module to configure the rise time and / or starting voltage of the drive signal based on the voltage sampling signal obtained by sampling the collector voltage and output the configured drive signal.

[0090] Among them, the operating parameters of IGBT are negatively correlated with the rise time and / or starting voltage of the drive signal.

[0091] In step S601, the control module compares the received IGBT operating parameters with preset parameter range values ​​and outputs the corresponding control signal based on the comparison result. For example, when the IGBT operating parameters are within the preset parameter range, the preset control signal is used; when the IGBT operating parameters are outside the preset parameter range, the configured control signal is used.

[0092] In step S602, the control module does not participate in configuring the drive signal. When the control module outputs a preset control signal, the drive module starts and outputs the preset drive signal when it receives the control signal. The IGBT receives the preset drive signal and turns on normally, and is powered on under normal conditions.

[0093] In step S603, when the drive module receives the control signal, it starts and outputs the configured drive signal. The difference from the above embodiment is that when the drive module outputs the drive signal, it directly configures the drive signal based on the reverse voltage detection signal, so that the rise time and / or starting voltage of the configured drive signal are negatively correlated with the IGBT operating parameters.

[0094] In summary, the IGBT drive control method in the electromagnetic heating cooking appliance according to the embodiments of the present invention receives the drive signal output by the IGBT operating parameter adjustment drive module, and makes the average voltage of the drive signal negatively correlated with the IGBT operating parameters to drive the IGBT to turn on or off. Thus, when the IGBT operating parameters reach or approach the protection threshold, the IGBT operating parameters can be further constrained. When protecting the IGBT from overcurrent or overvoltage, there is no need to directly shut off the input power supply, ensuring the stable operation of the electromagnetic heating cooking appliance.

[0095] It should be understood that various parts of the present invention can be implemented in hardware, software, firmware, or a combination thereof. In the above embodiments, multiple steps or methods can be implemented in software or firmware stored in memory and executed by a suitable instruction execution system. For example, if implemented in hardware, as in another embodiment, it can be implemented using any one or a combination of the following techniques known in the art: discrete logic circuits having logic gates for implementing logical functions on data signals, application-specific integrated circuits (ASICs) having suitable combinational logic gates, programmable gate arrays (PGAs), field-programmable gate arrays (FPGAs), etc.

[0096] The embodiments described in this invention are for the purpose of more clearly illustrating the technical solutions of the embodiments of this invention, and do not constitute a limitation on the technical solutions provided by the embodiments of this invention. As those skilled in the art will know, with the evolution of technology and the emergence of new application scenarios, the technical solutions provided by the embodiments of this invention are also applicable to similar technical problems.

[0097] Those skilled in the art will understand that the technical solutions shown in the figures do not constitute a limitation on the embodiments of the present invention, and may include more or fewer steps than shown, or combine certain steps, or different steps.

[0098] The device embodiments described above are merely illustrative. The circuits described as separate components may or may not be physically separate; that is, they may be located in one place or distributed across multiple network circuits. Some or all of the modules can be selected to achieve the purpose of this embodiment according to actual needs.

[0099] Those skilled in the art will understand that all or some of the steps in the methods disclosed above, as well as the functional modules / circuits in the systems and devices, can be implemented as software, firmware, hardware, or suitable combinations thereof.

[0100] The terms "first," "second," "third," "fourth," etc. (if present) in the specification and accompanying drawings of this invention are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that embodiments of the invention described herein can be implemented in orders other than those illustrated or described herein. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover a non-exclusive inclusion; for example, a process, method, system, product, or apparatus that comprises a series of steps or circuits is not necessarily limited to those steps or circuits explicitly listed, but may include other steps or circuits not explicitly listed or inherent to such processes, methods, products, or apparatus.

[0101] It should be understood that in this invention, "at least one (item)" refers to one or more, and "more than one" refers to two or more. "And / or" describes the relationship between related objects, indicating that three relationships can exist. For example, "A and / or B" can represent three cases: only A exists, only B exists, and both A and B exist simultaneously, where A and B can be singular or plural. The character " / " generally indicates that the preceding and following related objects are in an "or" relationship. "At least one (item) of the following" or similar expressions refer to any combination of these items, including any combination of single or plural items. For example, at least one (item) of a, b, or c can represent: a, b, c, "a and b", "a and c", "b and c", or "a and b and c", where a, b, and c can be single or multiple.

[0102] In the several embodiments provided by this invention, it should be understood that the disclosed apparatus and methods can be implemented in other ways. For example, the apparatus embodiments described above are merely illustrative; for instance, the circuit division described above is only a logical functional division, and in actual implementation, there may be other division methods. For example, multiple circuits or components may be combined or integrated into another system, or some features may be ignored or not executed. Furthermore, the mutual coupling or direct coupling or communication connection shown or discussed may be indirect coupling or communication connection through some interfaces, apparatus, or circuits, and may be electrical, mechanical, or other forms.

[0103] The circuits described above as separate components may or may not be physically separate. The components shown as circuits may or may not be physical circuits; that is, they may be located in one place or distributed across multiple network circuits. Some or all of the circuits can be selected to achieve the purpose of this embodiment according to actual needs.

[0104] Furthermore, the functional circuits in the various embodiments of the present invention can be integrated into a single processing circuit, or each circuit can exist physically separately, or two or more circuits can be integrated into a single circuit. The integrated circuits described above can be implemented in hardware or as software functional circuits.

[0105] If the integrated unit is implemented as a software functional unit and sold or used as an independent product, it can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of this application, in essence, or the part that contributes to the prior art, or all or part of the technical solution, can be embodied in the form of a software product. This computer software product is stored in a storage medium and includes multiple instructions to cause a computer device (which may be a personal computer, server, or network device, etc.) to execute all or part of the steps of the methods of the various embodiments of this application. The aforementioned storage medium includes various media capable of storing programs, such as USB flash drives, portable hard drives, read-only memory (ROM), random access memory (RAM), magnetic disks, or optical disks.

[0106] The preferred embodiments of the present invention have been described above with reference to the accompanying drawings, but this does not limit the scope of the claims of the present invention. Any modifications, equivalent substitutions, and improvements made by those skilled in the art without departing from the scope and spirit of the present invention should be within the scope of the claims of the present invention.

Claims

1. An electromagnetic heating drive controller, characterized in that, include: The drive module (10) is connected to the gate of the IGBT. The drive module (10) outputs a drive signal to the IGBT to drive the IGBT to turn on or off. The control module (20) has a signal input terminal and a control output terminal. The control module (20) receives IGBT operating parameters through the signal input terminal and generates corresponding control signals, and outputs control signals to the drive module (10) through the control output terminal. The IGBT operating parameters include at least the collector voltage and / or collector current. When the drive module (10) receives the control signal, it generates a drive signal so that the average voltage of the rising edge drive signal during the startup phase is negatively correlated with the IGBT operating parameters. The control module (20) generates a corresponding control signal based on the IGBT operating parameters, so that the drive module (10) generates a drive signal based on the control signal, so that the amplitude of the rising edge drive signal in the startup phase is positively correlated with the IGBT operating parameters. The control module (20) generates the control signal by setting the start voltage, end voltage, and rise time of the drive signal based on the IGBT operating parameters. The setting of the start voltage, end voltage, and rise time of the drive signal includes: During the startup phase, when the collector voltage exceeds the preset voltage threshold, the drive signal start voltage is reduced to V1, and the end voltage is maintained at V0. The rise time from the start voltage to the end voltage is T1. During the turn-off phase, the voltage of the drive signal drops from V0 to V2 during the fall time of T2, and then drops from V2 to V1 during the fall time of T3. That is, the voltage of the drive signal drops through a secondary voltage phase before dropping below the voltage required to turn on the IGBT.

2. The electromagnetic heating drive controller according to claim 1, characterized in that, Also includes: The detection module (30) is connected to the collector (C) terminal of the IGBT, samples the collector voltage, and outputs the obtained voltage sampling signal to the control module (20). The control module (20) receives the voltage sampling signal and generates a control signal, so that the drive module (10) generates a drive signal when it receives the control signal.

3. The electromagnetic heating drive controller according to claim 2, characterized in that, The detection module (30) includes a first comparison unit (31) and a second comparison unit (32); The first comparison unit (31) is connected to the collector (C) of the IGBT, samples the collector voltage and compares it with the first reference source, and outputs the comparison result to the control module (20). The second comparison unit (32) is connected to the collector (C) terminal of the IGBT, samples the collector voltage and compares it with the second reference source, and outputs the comparison result to the control module (20). The voltage value of the first reference source is different from the voltage value of the second reference source.

4. The electromagnetic heating drive controller according to claim 2, characterized in that, The detection module (30) samples the voltage at the collector (C) and outputs the obtained voltage sampling signal to the drive module (10). The control module (20) receives the voltage sampling signal and generates a control signal, so that the drive module (10) generates a drive signal based on the control signal or based on the voltage sampling signal.

5. An electromagnetic heating cooking appliance, characterized in that, Includes the electromagnetic heating drive controller as described in any one of claims 1 to 4.

6. A driving control method for an IGBT in an electromagnetic heating cooking appliance, characterized in that, The electromagnetic heating cooking appliance includes a drive module (10) and a control module (20). The drive output terminal of the drive module (10) is connected to the gate (G) of the IGBT. The control module (20) has a signal input terminal and a control output terminal. The drive control method includes the following steps: The control module (20) receives IGBT operating parameters through the signal input terminal and generates corresponding control signals, and outputs control signals to the drive module (10) through the control output terminal. When the drive module (10) receives the control signal, it generates a drive signal. The drive module (10) outputs the drive signal to the IGBT to drive the IGBT to turn on or off. Among them, the IGBT operating parameters include at least the collector voltage and / or collector current, such that the average voltage of the rising edge drive signal during the startup phase is negatively correlated with the IGBT operating parameters; The control module (20) generates a corresponding control signal based on the IGBT operating parameters, so that the drive module (10) generates a drive signal based on the control signal, so that the amplitude of the rising edge drive signal in the startup phase is positively correlated with the IGBT operating parameters. The control module (20) generates the control signal by setting the start voltage, end voltage, and rise time of the drive signal based on the IGBT operating parameters. The setting of the start voltage, end voltage, and rise time of the drive signal includes: During the startup phase, when the collector voltage exceeds the preset voltage threshold, the drive signal start voltage is reduced to V1, and the end voltage is maintained at V0. The rise time from the start voltage to the end voltage is T1. During the turn-off phase, the voltage of the drive signal drops from V0 to V2 during the fall time of T2, and then drops from V2 to V1 during the fall time of T3. That is, the voltage of the drive signal drops through a secondary voltage phase before dropping below the voltage required to turn on the IGBT.

7. The driving control method for IGBTs in electromagnetic heating cooking appliances according to claim 6, characterized in that, The control module (20) generates corresponding control signals based on the IGBT operating parameters, causing the drive module (10) to generate drive signals based on the control signals, including: The control module (20) determines whether the IGBT operating parameters are within the preset parameter range; If not, the control module (20) outputs the configured control signal, configures the rise time and / or starting voltage of the drive signal according to the control signal, and the drive module (10) outputs the configured drive signal; wherein the rise time and / or starting voltage of the drive signal are negatively correlated with the IGBT operating parameters.

8. The driving control method for IGBTs in electromagnetic heating cooking appliances according to claim 6, characterized in that, The control module (20) generates corresponding control signals based on the IGBT operating parameters, causing the drive module (10) to generate drive signals based on the control signals, including: The control module (20) determines whether the IGBT operating parameters are within the preset parameter range; If not, the control module (20) outputs a control signal, causing the drive module (10) to configure the rise time and / or starting voltage of the drive signal based on the voltage sampling signal obtained by sampling the C-terminal voltage and output the configured drive signal; wherein the rise time and / or starting voltage of the drive signal are negatively correlated with the IGBT operating parameters.

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