Driving control method and driving control device of a heating module

Abstract

The application discloses a driving control method and device of a heating module, the driving control method comprises the following steps: acquiring at least one of an input power voltage, a whole machine power in a starting stage and an actual temperature of a power switch; and adjusting a driving parameter of the power switch based on the input power voltage, the whole machine power in the starting stage and the actual temperature of the power switch. In this way, the rising rate of the whole machine power in the starting stage is appropriately increased, and the switching loss of the power switch is reduced. Meanwhile, in the starting stage, the power rising rate of the heating module is increased, the rising time is shortened, and the time of small power is shortened, so that the switching loss of the power switch is reduced, and the temperature rise of the power switch is reduced. In addition, in the running process, that is, in the heating stage, when the input power voltage is high, the driving voltage of the power switch is appropriately reduced, and the switching loss of the power switch is reduced.

Description

Technical Field

[0001] This invention relates to the field of IGBT drive technology, and specifically to a drive control method and drive control device for a heating module. Background Technology

[0002] Rice cookers have become an essential household appliance. Currently, rice cookers on the market mainly use either a heating plate or an induction heating (IH) system. IH heating, with its high heating efficiency and even cooking, is increasingly popular among consumers. IH heating primarily employs single-stage and multi-stage IH coil control methods. Multi-stage IH coil control technology provides a larger heating area for the food, further improving cooking evenness and leading to its wider application.

[0003] Because multi-segment IH control technology involves frequent switching control of multiple coil disks, the power device IGBT frequently switches and starts, resulting in high switching losses and high switching temperature of the power device. Summary of the Invention

[0004] Therefore, the present invention aims to solve the problem in the prior art where frequent switching control of multiple coils leads to high switching losses and high switching temperatures of power devices. To address these problems, the present invention provides a driving control method and driving control device for a heating module.

[0005] To achieve the above objectives, embodiments of the present invention provide a driving control method for a heating module. The driving control method includes: acquiring at least one of an input power supply voltage, the total power during startup, and the actual temperature of a power switch; and adjusting the driving parameters of the power switch based on the input power supply voltage, the total power during startup, and the actual temperature of the power switch.

[0006] Optionally, the drive control method includes:

[0007] After entering the heating stage, the input power supply voltage is obtained;

[0008] The driving voltage of the power switch is adjusted based on the input power supply voltage.

[0009] Optionally, adjusting the drive voltage of the power switch based on the input power supply voltage includes:

[0010] The actual power of the heating module is obtained based on the input power supply voltage;

[0011] Based on the actual power, adjust the driving voltage of the power switch.

[0012] Optionally, the input power supply voltage and the actual power are both proportional to the driving voltage of the power switch.

[0013] Optionally, the drive control method includes:

[0014] Obtain the start signal of the heating module;

[0015] After entering the startup phase, the overall power of the heating module is increased to the set power.

[0016] Obtain the actual power of the heating module;

[0017] The driving voltage of the power switch is adjusted based on the actual power.

[0018] Optionally, the actual power is proportional to the driving voltage.

[0019] Optionally, the drive control method further includes:

[0020] After entering the startup phase, the actual temperature of the power switch is obtained;

[0021] When the actual temperature is higher than the preset temperature, the power rise rate of the actual power is increased;

[0022] When the actual temperature is lower than the preset temperature, the power increase rate of the actual power is reduced, or the increase rate is kept constant.

[0023] This invention also provides a drive control device for a heating module, the drive control device comprising:

[0024] The acquisition module is used to acquire at least one of the following: input power supply voltage, total power during startup, and actual temperature of the power switch;

[0025] The adjustment module is used to adjust the drive parameters of the power switch based on the input power supply voltage, the total power during startup, and the actual temperature of the power switch.

[0026] This invention provides an electronic device, which includes a memory and a processor, wherein the memory and the processor are communicatively connected to each other, the memory stores computer instructions, and the processor executes the computer instructions to perform the drive control method described in any of the above embodiments.

[0027] This invention provides a computer-readable storage medium storing computer instructions for causing a computer to execute the drive control method described in any of the above embodiments.

[0028] Compared with the prior art, the technical solution of the present invention has the following advantages:

[0029] 1. This invention provides a driving control method for a heating module, the driving control method comprising: acquiring at least one of an input power supply voltage, the total power during startup, and the actual temperature of a power switch; and adjusting the driving parameters of the power switch based on the input power supply voltage, the total power during startup, and the actual temperature of the power switch.

[0030] With this setup, as the entire unit heats up to its rated power, the actual power gradually increases from a low level. Because the coil's energy storage is insufficient at low power, the voltage at the LC resonant terminal in the heating module cannot drop to zero, causing the power switch to be in a hard-on state, resulting in significant power switch losses. Therefore, appropriately increasing the power rise rate during startup can reduce the switching losses of the power switch. Simultaneously, if the low power duration is prolonged during startup, the hard switching losses of the power switch are large, leading to a higher temperature rise. Therefore, increasing the power rise rate of the heating module and shortening the rise time during startup reduces the duration of low power, thereby reducing the switching losses of the power switch and helping to lower its temperature rise. Furthermore, during operation, specifically the heating phase, fluctuations in the mains power cause changes in the input voltage of the heating module. Higher input voltages result in greater switching losses due to the hard-on state of the power switch. When the power switch is in a hard-on state, it operates in the amplification region, where switching losses constitute the majority of the power loss. Therefore, appropriately reducing the drive voltage of the power switch when the input voltage increases can reduce its switching losses. Attached Figure Description

[0031] To more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0032] Figure 1 This is a schematic diagram of a driving control method for a heating module according to an embodiment of the present invention;

[0033] Figure 2 This is a schematic diagram of a heating module according to an embodiment of the present invention. Detailed Implementation

[0034] The technical solution of the present invention will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0035] In the description of this invention, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing the invention and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0036] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can also refer to the internal connection of two components; and they can refer to a wireless connection or a wired connection. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0037] Furthermore, the technical features involved in the different embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0038] Rice cookers have become an essential household appliance. Currently, rice cookers on the market mainly use either heating plates or induction heating (IH) methods. IH heating, with its high heating efficiency and even cooking, is increasingly popular among consumers. IH heating primarily employs single-segment and multi-segment IH coil control. Multi-segment IH coil control technology provides a larger heating area for the food, further improving cooking evenness and leading to its wider application. However, because multi-segment IH control involves frequent switching of multiple coils, the IGBT power devices frequently switch on and off, resulting in higher switching losses and increased switching temperatures.

[0039] Therefore, the present invention aims to solve the problem in the prior art where frequent switching control of multiple coils leads to high switching losses and high switching temperatures of power devices. To address these problems, the present invention provides a driving control method and driving control device for a heating module.

[0040] Example 1

[0041] like Figures 1 to 2 As shown, this embodiment of the invention provides a driving control method for a heating module, which specifically includes the following steps:

[0042] S1. Obtain at least one of the following: input power supply voltage, total power during startup, and actual temperature of the power switch;

[0043] S2. Adjust the drive parameters of the power switch based on the input power supply voltage, the total power during startup, and the actual temperature of the power switch.

[0044] The power switch can be an IGBT, and its driving parameter can be the driving voltage. During the heating process from startup to rated power, the actual power gradually increases. Because the coil energy storage is insufficient at low power, the voltage at the LC resonant terminal in the heating module cannot drop to zero, causing the power switch to be in a hard-on state, resulting in significant power switch losses. Therefore, appropriately increasing the power rise rate during startup can reduce the switching losses of the power switch. Simultaneously, if the low power duration is long during startup, the hard switching losses of the power switch are large, leading to a higher temperature rise. Therefore, increasing the power rise rate and shortening the rise time during startup reduces the duration of low power, thus reducing the switching losses of the power switch and helping to lower its temperature rise. Furthermore, during operation, specifically the heating phase, fluctuations in the mains power cause changes in the input voltage of the heating module. Higher input voltages result in greater switching losses due to the hard-on state of the power switch. When the power switch is in a hard-on state, it operates in the amplification region, where switching losses constitute the majority of the power switch's operation. Therefore, when the input power supply voltage increases, appropriately reducing the driving voltage of the power switch can reduce the switching losses of the power switch.

[0045] Of course, this embodiment is merely an example of a power switch and its driving parameters, but it does not limit the scope of the invention. Those skilled in the art can make changes according to the actual situation to achieve the same technical effect.

[0046] Furthermore, in a specific embodiment of the present invention, when the input power supply voltage is acquired, the drive control method includes:

[0047] S11. After entering the heating stage, obtain the input power supply voltage;

[0048] S12. Adjust the drive voltage of the power switch based on the input power supply voltage.

[0049] During operation, specifically the heating phase, fluctuations in the mains power cause changes in the input voltage of the heating module. Higher input voltages result in greater switching losses due to the power switch being hard-switched. When the power switch is hard-switched, it operates in the amplification region, where switching losses constitute the majority of the power loss.

[0050] For example, when the input power supply voltage fluctuates, it is V1 and V2, with V1 being greater than V2. During the coil heating start-up process, before reaching the rated power, the initial start-up voltages of the IGBT are Vq1 and Vq2, with Vq1 being less than Vq2. These two voltages, Vq1 and Vq2, are related to the input power supply voltage; a higher input voltage corresponds to a lower start-up voltage. That is, the input power supply voltage is directly proportional to the driving voltage of the power switch. Similarly, the actual power of the heating module can be obtained based on the input power supply voltage, and then the driving voltage of the power switch can be adjusted based on the actual power. Therefore, the actual power is also directly proportional to the driving voltage of the power switch.

[0051] Furthermore, during the startup phase, as the overall power increases, the drive voltage increases accordingly, namely Vq1+ΔV1 and Vq2+ΔV2, where ΔV1 and ΔV2 are greater than zero. When the input power supply voltage fluctuates, under the same power, Vq1+ΔV1 is less than Vq2+ΔV2. When the actual power of the heating module reaches the rated power, the IGBT drive voltage is equal or Vq1+ΔV1 is less than Vq2+ΔV2.

[0052] Furthermore, in one specific embodiment of the present invention, the drive control method includes:

[0053] S13. Obtain the start signal of the heating module;

[0054] S14. After entering the startup phase, control the overall power of the heating module to increase to the set power;

[0055] S15. Obtain the actual power of the heating module;

[0056] S16. Adjust the driving voltage of the power switch based on the actual power.

[0057] After receiving the start signal from the heating module, the entire unit begins heating. As the unit heats up to its rated power, the actual power gradually increases, causing the overall power of the heating module to gradually increase to the set power. Because the coil's energy storage is insufficient at low power, the voltage at the LC resonant terminal in the heating module cannot drop to zero, causing the power switch to be in a hard-on state, resulting in significant power switch losses.

[0058] Therefore, appropriately increasing the rate of increase of the overall power during the startup phase can reduce the switching losses of the power switch. First, the actual power of the heating module is obtained, and then the drive voltage of the power switch is adjusted based on the actual power. In this embodiment of the invention, the overall power during the startup phase increases from low to high, and the IGBT drive voltage increases accordingly from low to high. That is, the actual power is directly proportional to the drive voltage.

[0059] Furthermore, in one specific embodiment of the present invention, the drive control method further includes:

[0060] S16. After entering the startup phase, obtain the actual temperature of the power switch;

[0061] S17. When the actual temperature is higher than the preset temperature, increase the power rise rate of the actual power.

[0062] S18. When the actual temperature is lower than the preset temperature, reduce the power increase rate of the actual power, or keep the increase rate unchanged.

[0063] Meanwhile, during the startup phase, if the low power is maintained for a long time, the hard switching loss of the power switch will be large, resulting in a high temperature rise of the power switch.

[0064] Therefore, during the startup phase, the actual temperature of the power switch is first acquired. When the actual temperature is higher than the preset temperature, the power rise rate of the heating module is increased, thereby shortening the power rise time of the heating module and enabling it to reach the set power as quickly as possible, thus shortening the duration of low power operation. This reduces the switching losses of the power switch and helps to reduce its temperature rise. When the actual temperature is lower than the preset temperature, the power rise rate is reduced or kept constant. The preset temperature is the temperature point that needs protection, and multiple temperature points can be set according to actual conditions.

[0065] Specifically, by detecting the temperature rise of each IGBT, when the temperature is too high, the power increase rate during the startup phase is adaptively adjusted to reduce the IGBT temperature rise. For example, when the temperature is lower than the preset temperature, the overall power increases by ΔP1 at interval ΔT. When the temperature is higher than K, the overall power increases by ΔP2 at interval ΔT, where ΔP2 is greater than ΔP1.

[0066] Example 2

[0067] According to a second aspect of the present invention, a drive control device for a heating module is provided, the drive control device comprising:

[0068] The acquisition module is used to acquire at least one of the following: input power supply voltage, total power during startup, and actual temperature of the power switch;

[0069] The adjustment module is used to adjust the drive parameters of the power switch based on the input power supply voltage, the total power during startup, and the actual temperature of the power switch.

[0070] This configuration, by appropriately increasing the power rise rate during startup, reduces the switching losses of the power switch. Furthermore, during operation, specifically the heating phase, when the input power voltage increases, appropriately reducing the power switch's drive voltage further reduces its switching losses. Simultaneously, increasing the power rise rate of the heating module during startup shortens the rise time, reducing the duration of low power operation and thus lowering the power switch's switching losses, which is beneficial for reducing the power switch's temperature rise.

[0071] Example 3

[0072] According to a third aspect, an embodiment of the present invention provides an electronic device that may include a processor and a memory, wherein the processor and the memory may be connected by a bus or other means, for example, by a bus connection.

[0073] The processor can be a central processing unit (CPU). It can also be other general-purpose processors, digital signal processors (DSPs), application-specific integrated circuits (ASICs), field-programmable gate arrays (FPGAs), or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, or combinations thereof.

[0074] Memory, as a non-transitory computer-readable storage medium, can be used to store non-transitory software programs, non-transitory computer-executable programs, and modules, such as the program instructions / modules corresponding to the drive control method in the embodiments of this invention. The processor executes various functional applications and data processing by running the non-transitory software programs, instructions, and modules stored in the memory, thereby implementing the drive control method in the above method embodiments.

[0075] The memory may include a program storage area and a data storage area. The program storage area may store the operating system and applications required for at least one function; the data storage area may store data created by the processor, etc. Furthermore, the memory may include high-speed random access memory and non-transitory memory, such as at least one disk storage device, flash memory device, or other non-transitory solid-state storage device. In some embodiments, the memory may optionally include memory remotely located relative to the processor, which can be connected to the processor via a network. Examples of such networks include, but are not limited to, the Internet, corporate intranets, local area networks, mobile communication networks, and combinations thereof.

[0076] The one or more modules are stored in the memory, and when executed by the processor, they perform any of the drive control methods described in the above embodiments.

[0077] The specific details of the above-mentioned electronic device can be understood by referring to the relevant descriptions and effects in any of the above embodiments, and will not be repeated here.

[0078] Example 4

[0079] This invention also provides a computer-readable storage medium storing computer instructions for causing the computer to execute any of the drive control methods described above.

[0080] The storage medium may be a magnetic disk, optical disk, read-only memory (ROM), random access memory (RAM), flash memory, hard disk drive (HDD), or solid-state drive (SSD), etc.; the storage medium may also include combinations of the above types of memory.

[0081] Obviously, the above embodiments are merely illustrative examples for clear explanation and are not intended to limit the implementation. Those skilled in the art can make other variations or modifications based on the above description. It is neither necessary nor possible to exhaustively list all possible implementations here. However, obvious variations or modifications derived therefrom are still within the scope of protection of this invention.

Claims

1. A driving control method for a heating module, characterized in that, include: At least one of the following should be obtained: input power supply voltage, total power during startup, and actual temperature of the power switch; The driving parameters of the power switch are adjusted based on the input power supply voltage, the total power during startup, and the actual temperature of the power switch. After entering the heating stage, the input power supply voltage is obtained; Based on the input power supply voltage, adjust the drive voltage of the power switch; Adjusting the drive voltage of the power switch based on the input power supply voltage includes: The actual power of the heating module is obtained based on the input power supply voltage; Based on the actual power, adjust the driving voltage of the power switch; The input power supply voltage and the actual power are both inversely proportional to the driving voltage of the power switch; Obtain the start signal of the heating module; After entering the startup phase, the overall power of the heating module is increased to the set power. Obtain the actual power of the heating module; Adjust the drive voltage of the power switch based on the actual power; The actual power is proportional to the driving voltage.

2. The drive control method according to claim 1, characterized in that, Also includes: After entering the startup phase, the actual temperature of the power switch is obtained; When the actual temperature is higher than the preset temperature, the power rise rate of the actual power is increased; When the actual temperature is lower than the preset temperature, the power increase rate of the actual power is reduced, or the increase rate is kept constant.

3. A drive control device for a heating module, characterized in that, include: The acquisition module is used to acquire at least one of the following: input power supply voltage, total power during startup, and actual temperature of the power switch; The adjustment module is used to adjust the drive parameters of the power switch based on the input power supply voltage, the total power during startup, and the actual temperature of the power switch.

4. An electronic device, characterized in that, include: A memory and a processor are communicatively connected, the memory stores computer instructions, and the processor executes the drive control method according to any one of claims 1 to 2 by executing the computer instructions.

5. A computer-readable storage medium, characterized in that, The computer-readable storage medium stores computer instructions for causing the computer to perform the drive control method according to any one of claims 1 to 2.

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