CN113630922B

CN113630922B - Electromagnetic heating device and IGBT control method thereof

Info

Publication number: CN113630922B
Application number: CN202110963793.7A
Authority: CN
Inventors: 肖淙宇; 陈和辉; 卜韩萍; 张博超; 刘畅
Original assignee: Gree Electric Appliances Inc of Zhuhai
Current assignee: Gree Electric Appliances Inc of Zhuhai
Priority date: 2021-08-21
Filing date: 2021-08-21
Publication date: 2022-06-14
Anticipated expiration: 2041-08-21
Also published as: CN113630922A

Abstract

The invention discloses an electromagnetic heating device and a control method of an IGBT thereof, wherein the method comprises the following steps: judging the heating mode of the electromagnetic heating device; when the acquired heating mode of the electromagnetic heating device is a first power heating mode, controlling the IGBT to be started by first driving voltage; and when the acquired heating mode of the electromagnetic heating device is a second power heating mode, controlling the IGBT to be switched on by second driving voltage, wherein the second driving voltage is greater than the first driving voltage. According to the electromagnetic heating device and the IGBT control method thereof, the driving voltage of the IGBT is determined according to the heating mode of the electromagnetic heating device, the conduction loss of the IGBT is reduced, and the real-time temperature or the temperature rise rate of the IGBT is minimized by adjusting the driving voltage of the IGBT between the turn-on voltage and the breakdown voltage of the IGBT, so that the loss of the IGBT is further reduced.

Description

Electromagnetic heating device and IGBT control method thereof

Technical Field

The invention belongs to the technical field of cooking appliances, and particularly relates to an electromagnetic heating device and a control method of an IGBT (insulated gate bipolar translator) of the electromagnetic heating device.

Background

In the related art, the existing induction cooker mostly adopts a single-tube LC parallel resonance scheme, which adopts a single resonance capacitor and a coil panel, and adopts a driving scheme of an Insulated Gate Bipolar Transistor (IGBT).

When the induction cooker is heated at low power, the energy storage of the coil panel is less, the back pressure of the IGBT drain electrode is difficult to reduce to 0V in the resonance process, the IGBT is turned on at the moment to cause turn-on loss, and the loss is larger when the voltage between CE electrodes is higher. During high-power heating, the current passing through the IGBT is large, the voltage between CE poles is increased when the IGBT is conducted, and the conduction loss is large. The high loss of the IGBT causes high heat generation, making the requirements of the heat sink and the heat dissipation fan higher.

Disclosure of Invention

In order to solve the technical problems mentioned in the background art, the invention provides an electromagnetic heating device and a control method of an IGBT thereof, which aim to solve the technical problem of large IGBT conduction loss of the existing electromagnetic heating device.

In order to achieve the above purpose, the specific technical scheme of the electromagnetic heating device and the control method of the IGBT thereof of the invention is as follows:

an IGBT control method of an electromagnetic heating device comprises the following steps:

judging the heating mode of the electromagnetic heating device;

when the acquired heating mode of the electromagnetic heating device is a first power heating mode, controlling the IGBT to be started by first driving voltage;

and when the acquired heating mode of the electromagnetic heating device is a second power heating mode, controlling the IGBT to be switched on by second driving voltage, wherein the second driving voltage is greater than the first driving voltage.

Further, the determining the heating mode of the electromagnetic heating device includes:

acquiring the voltage between CE poles of the IGBT before the IGBT is started;

judging whether the voltage between CE electrodes of the IGBT is larger than zero before the IGBT is started;

if the voltage between CE electrodes of the IGBT is larger than zero before the IGBT is started, judging that the heating mode of the electromagnetic heating device is a first power heating mode; and if the voltage between the CE poles of the IGBT is less than or equal to zero, determining that the heating mode of the electromagnetic heating device is a second power heating mode.

Further, after the controlling the IGBT to turn on at the first driving voltage, the method further includes:

controlling and reducing the driving voltage of the IGBT, and acquiring real-time temperature values of the IGBT before and after the driving voltage is adjusted;

judging whether the difference value of the real-time temperature values of the IGBT after the driving voltage of the IGBT is adjusted and before the driving voltage of the IGBT is adjusted is larger than or equal to a preset temperature threshold value or not;

when the difference value of the real-time temperature values of the IGBT after the driving voltage of the IGBT is adjusted and before the driving voltage of the IGBT is adjusted is larger than or equal to the preset temperature threshold value, the real-time temperature value of the IGBT is not reduced any more, and the IGBT is controlled to operate by the driving voltage before the driving voltage is adjusted.

Further, after the controlling the IGBT to turn on at the second driving voltage, the method further includes:

controlling and increasing the driving voltage of the IGBT, and acquiring real-time temperature values of the IGBT before and after the driving voltage is adjusted;

when the difference value between the real-time temperature values of the IGBT after the drive voltage of the IGBT is adjusted and the real-time temperature values of the IGBT before the drive voltage of the IGBT is adjusted is larger than or equal to the preset temperature threshold value, the real-time temperature of the IGBT is not reduced any more, and the IGBT is controlled to operate by adjusting the driving voltage before.

Further, before the determining the heating mode of the electromagnetic heating device, the method further includes:

judging whether the IGBT is in a cold start stage;

if the IGBT is judged not to be in the cold starting stage, executing a program for judging the heating mode of the electromagnetic heating device;

and if the IGBT is judged to be in the cold starting stage, controlling the IGBT to start with a third driving voltage.

Further, the determining whether the IGBT is in a cold start phase includes:

acquiring the time interval of the IGBT starting at two adjacent times;

judging whether the time interval of the two adjacent starting of the IGBT is greater than the preset switching period of the IGBT or not;

if the time interval between two adjacent starting of the IGBT is less than or equal to the preset switching period of the IGBT, judging that the IGBT is not in a cold starting stage;

and if the time interval between two adjacent starting of the IGBT is greater than the preset switching period of the IGBT, judging that the IGBT is in a cold starting stage.

Further, after the controlling the IGBT is started at the third driving voltage, the method further includes:

controlling and reducing the driving voltage of the IGBT;

acquiring the temperature rise rate of the IGBT in the cold start stage and the last cold start stage at the same heating power, wherein the temperature rise rate is the temperature change increment of the IGBT in a preset time;

judging whether the temperature rise rate of the IGBT in the cold starting stage is greater than that of the IGBT in the previous cold starting stage or not under the same heating power;

and if the temperature rise rate of the IGBT in the cold starting stage is smaller than or equal to that of the IGBT in the previous cold starting stage under the same heating power, controlling the IGBT to be driven by the adjusted driving voltage.

An electromagnetic heating device comprising:

the judging module is used for judging the heating mode of the electromagnetic heating device;

the control module is used for controlling the IGBT to be started by first driving voltage when the acquired heating mode of the electromagnetic heating device is a first power heating mode; and when the acquired heating mode of the electromagnetic heating device is a second power heating mode, controlling the IGBT to be switched on by second driving voltage, wherein the second driving voltage is greater than the first driving voltage.

Further, the apparatus further comprises:

the acquisition module is used for detecting the voltage between CE poles of the IGBT in real time;

the judging module is used for judging that the heating mode of the electromagnetic heating device is a first power heating mode if the voltage between the CE poles of the IGBT is larger than zero; and if the voltage between the CE poles of the IGBT is detected to be less than or equal to zero, determining that the heating mode of the electromagnetic heating device is the second power heating mode.

Further, the apparatus further comprises:

the temperature detection module is used for detecting the real-time temperature value of the IGBT;

the control module is also used for controlling and reducing the driving voltage of the IGBT after controlling the IGBT to be started with the first driving voltage, and acquiring real-time temperature values of the IGBT before and after the driving voltage is adjusted; when the difference value of the real-time temperature values of the IGBT after the driving voltage of the IGBT is adjusted and before the driving voltage of the IGBT is adjusted is larger than or equal to the preset temperature threshold value, the real-time temperature of the IGBT is not reduced any more, and the IGBT is controlled to operate at the driving voltage before the driving voltage is adjusted.

Further, the control module is further configured to control to increase the driving voltage of the IGBT after controlling the IGBT to be turned on at the second driving voltage, and obtain real-time temperature values of the IGBT before and after the driving voltage is adjusted; when the difference value of the real-time temperature values of the IGBT after the driving voltage of the IGBT is adjusted and before the driving voltage of the IGBT is adjusted is larger than or equal to the preset temperature threshold value, the real-time temperature value of the IGBT is not reduced any more, and the IGBT is controlled to operate by the driving voltage before the driving voltage is adjusted.

Further, the judging module is also used for judging whether the IGBT is in a cold start stage;

the control module is further configured to execute the program for determining the heating mode of the electromagnetic heating device if it is determined that the IGBT is not in the cold start stage, and control the IGBT to start with the third driving voltage if it is determined that the IGBT is in the cold start stage.

Further, the control module is also used for controlling and reducing the driving voltage of the IGBT;

The electromagnetic heating device and the IGBT control method thereof have the following advantages that: according to the electromagnetic heating device and the IGBT control method thereof, the driving voltage of the IGBT is determined according to the heating mode of the electromagnetic heating device, the conduction loss of the IGBT is reduced, and the real-time temperature or the temperature rise rate of the IGBT is minimized by adjusting the driving voltage of the IGBT between the turn-on voltage and the breakdown voltage of the IGBT, so that the loss of the IGBT is further reduced.

Drawings

Fig. 1 is a control flowchart of a first embodiment of an IGBT control method of an electromagnetic heating apparatus of the present invention;

fig. 2 is a control flowchart of a second embodiment of the IGBT control method of the electromagnetic heating apparatus of the present invention;

fig. 3 is a control flowchart of a third embodiment of the IGBT control method of the electromagnetic heating apparatus of the invention;

fig. 4 is a control flowchart of a fourth embodiment of the IGBT control method of the electromagnetic heating apparatus of the invention;

FIG. 5 is a schematic structural diagram of an electromagnetic heating apparatus according to the present invention;

fig. 6 is a schematic structural diagram of another embodiment of the electromagnetic heating apparatus of the present invention.

Detailed Description

The technical solutions of the present invention will be described clearly and completely with reference to the accompanying drawings, and it should be understood that the described embodiments are some, but not all embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art. In addition, the technical features involved in the different embodiments of the present invention described below may be combined with each other as long as they do not conflict with each other.

The electromagnetic heating device can be used for cooking appliances such as induction cookers, IH electric cookers and the like. The electromagnetic heating device comprises a single or a plurality of single-tube LC parallel resonance circuits, the single-tube LC parallel resonance circuit comprises a resonance capacitor and a coil panel which are connected in parallel, a public end of the resonance capacitor and the coil panel after being connected in parallel is connected with a C pole of the IGBT, a G pole of the IGBT is connected with an IGBT driving circuit to drive the IGBT, an E pole of the IGBT is grounded, the IGBT driving circuit is connected with a voltage regulating circuit, and the voltage regulating circuit is connected with a main control chip to regulate the driving voltage of the IGBT.

Fig. 1 schematically shows a control flow diagram of a first embodiment of an IGBT control method for an electromagnetic heating apparatus. As shown in fig. 1, an IGBT control method of an electromagnetic heating apparatus includes the steps of:

s10, judging the heating mode of the electromagnetic heating device;

specifically, the determining the heating mode of the electromagnetic heating device includes:

acquiring the voltage between CE poles of the IGBT before the IGBT is started;

S20, when the obtained heating mode of the electromagnetic heating device is a first power heating mode, controlling the IGBT to be opened by first driving voltage;

specifically, when the electromagnetic heating device is in a low-power heating mode, the IGBT is driven by a lower first driving voltage, so that the saturation current of the IGBT is reduced, the peak current at the moment of switching-on is reduced, and the switching-on loss of the IGBT is reduced.

In order to ensure that the IGBT is normally turned on, it is necessary to ensure that the first driving voltage is greater than the gate turn-on voltage of the IGBT.

And S30, when the acquired heating mode of the electromagnetic heating device is a second power heating mode, controlling the IGBT to be turned on by a second driving voltage, wherein the second driving voltage is greater than the first driving voltage.

Specifically, when the electromagnetic heating device is in a high-power heating mode, the IGBT is driven by a higher second driving voltage, and when the IGBT is conducted, the voltage between CE poles is reduced, so that the conduction loss of the IGBT is reduced.

Typically, the second driving voltage is less than the breakdown voltage of the gate of the IGBT in case the CE pole of the IGBT breaks down.

According to the IGBT control method of the electromagnetic heating device, provided by the embodiment of the invention, the driving voltage of the IGBT is determined according to the heating mode of the electromagnetic heating device, a smaller driving voltage is adopted during low-power heating to reduce the saturation current, and a larger driving voltage is adopted during high-power heating to reduce the voltage between CE poles, so that the conduction loss of the IGBT is effectively reduced.

In this embodiment, during low-power heating, when the IGBT is turned on by using a smaller driving voltage, the voltage between CE electrodes of the IGBT increases, which increases the turn-on loss of the IGBT, so as shown in fig. 2, after the controlling the IGBT to be turned on by using the first driving voltage, the method further includes:

s201, controlling and reducing the driving voltage of the IGBT, and acquiring real-time temperature values of the IGBT before and after the driving voltage is adjusted;

s202, judging whether the difference value of the real-time temperature values of the IGBT after the drive voltage of the IGBT is adjusted and before the drive voltage of the IGBT is adjusted is larger than or equal to a preset temperature threshold value or not;

s203, when the difference value between the real-time temperature values of the IGBT after the drive voltage of the IGBT is adjusted and before the drive voltage of the IGBT is adjusted is larger than or equal to a preset temperature threshold value, the real-time temperature value of the IGBT is not reduced any more, and the IGBT is controlled to operate with the drive voltage before the drive voltage is adjusted;

and S204, when the difference value between the real-time temperature values of the IGBT after the drive voltage of the IGBT is adjusted and before the drive voltage of the IGBT is adjusted is smaller than a preset temperature threshold value, executing the step S201 until the real-time temperature value of the IGBT is not reduced any more.

In the IGBT conduction process, the larger the loss of the IGBT is, the serious heat generation of the IGBT is caused, and the real-time temperature of the IGBT is detected by gradually reducing the driving voltage of the IGBT, so that the driving voltage of the IGBT corresponding to the minimum real-time temperature value of the IGBT is determined and used as the target driving voltage of the IGBT, and the conduction loss of the IGBT is kept at a lower value.

Typically, the predetermined temperature threshold may be between 0 ℃ and 3 ℃.

In addition to determining whether the real-time temperature value of the IGBT is reduced to the minimum value by comparing the size relationship between the difference value of the real-time temperature values of the IGBT after and before the adjustment of the driving voltage and a preset temperature threshold value, the ratio of the real-time temperature value of the IGBT after the adjustment of the driving voltage to the real-time temperature value of the IGBT before the adjustment can be compared with 1, when the ratio is greater than 1, the temperature is increased after the adjustment of the driving voltage, and the driving voltage before the adjustment is used as a target driving voltage to drive the IGBT to operate; and when the ratio is less than 1, the temperature is reduced after the driving voltage is adjusted, the driving voltage of the IGBT can be continuously reduced, and then the minimum value of the real-time temperature of the IGBT is determined.

In this embodiment, when the electromagnetic heating device is heated at a high power, the IGBT is driven by a higher second driving voltage, the saturation current of the IGBT increases, the peak current at the moment of turn-on increases, the turn-on loss of the IGBT increases, and excessively increasing the second driving voltage causes a reduced turn-on loss of the IGBT to be smaller than the increased turn-on loss, so that the minimum loss of the IGBT cannot be ensured. Therefore, as shown in fig. 3, after the controlling IGBT is turned on by the second driving voltage, the method further includes:

s301, controlling and increasing the driving voltage of the IGBT, and acquiring real-time temperature values of the IGBT before and after the driving voltage is adjusted;

s302, judging whether the difference value of the real-time temperature values of the IGBT after the drive voltage of the IGBT is adjusted and before the drive voltage of the IGBT is adjusted is larger than or equal to a preset temperature threshold value;

s303, when the real-time temperature difference value of the IGBT after and before the drive voltage of the IGBT is adjusted is larger than or equal to a preset temperature threshold value, the real-time temperature value of the IGBT is not reduced any more, and the IGBT is controlled to operate by the drive voltage before the drive voltage is adjusted;

s304, when the difference value between the real-time temperature values of the IGBT after the driving voltage of the IGBT is adjusted and before the driving voltage of the IGBT is adjusted is smaller than a preset temperature threshold value, the real-time temperature value of the IGBT still does not reach the minimum value, and the step S301 is continuously executed.

In this embodiment, as shown in fig. 1, before the determining the heating mode of the electromagnetic heating apparatus, the method further includes:

s40, judging whether the IGBT is in a cold start stage;

s10, if the IGBT is judged not to be in the cold starting stage, executing the program for judging the heating mode of the electromagnetic heating device;

and S50, if the IGBT is judged to be in the cold starting stage, controlling the IGBT to start with a third driving voltage, wherein the third driving voltage is greater than the turn-on voltage of the IGBT grid and smaller than the breakdown voltage of the IGBT.

Specifically, the state of the IGBT before being turned on affects the loss of the IGBT, and the determining whether the IGBT is in a cold start phase includes:

acquiring the time interval of the IGBT starting at two adjacent times;

judging whether the time interval of the two adjacent starting of the IGBT is larger than the preset switching period of the IGBT or not;

if the time interval of the two adjacent starting of the IGBT is greater than the preset switching period of the IGBT, judging that the IGBT is in a cold starting stage;

and if the time interval between two adjacent IGBTs for starting is less than or equal to the preset switching period of the IGBT, judging that the IGBT is not in the cold starting stage.

According to the IGBT control method of the electromagnetic heating device, provided by the embodiment of the invention, the starting state of the IGBT is determined by detecting the time interval between two adjacent starting times, if the time interval between two adjacent starting times is long, the IGBT is not started for a long time, the real-time temperature of the IGBT is low, and the IGBT is driven by the third driving voltage, so that the loss of the IGBT can be reduced.

Further, as shown in fig. 4, after the controlling the IGBT to start up at the third driving voltage, the method further includes:

s501, controlling and reducing the driving voltage of the IGBT;

s502, acquiring the temperature rise rate of the IGBT in the cold start stage and the previous cold start stage at the same heating power, wherein the temperature rise rate is the temperature change increment of the IGBT in a preset time;

s503, judging whether the temperature rise rate of the IGBT in the cold starting stage is larger than that of the IGBT in the previous cold starting stage or not under the same heating power;

and S504, if the temperature rise rate of the IGBT in the cold starting stage is smaller than or equal to that of the IGBT in the previous cold starting stage under the same heating power, controlling the IGBT to be driven by the adjusted driving voltage.

In the adjusting process, the driving voltage of the IGBT is always between the turn-on voltage and the breakdown voltage of the IGBT so as to ensure the normal work of the IGBT. The driving voltage of the IGBT may be increased or decreased by 0.1V each time, which may also be determined according to actual conditions.

According to the IGBT control method of the electromagnetic heating device, provided by the embodiment of the invention, different driving voltages are selected according to the starting mode of the IGBT and the heating power of the electromagnetic heating device, and the real-time temperature or the temperature rise rate of the IGBT is reduced to the minimum by gradually adjusting the driving voltage of the IGBT, so that the loss of the IGBT is reduced.

As shown in fig. 5, an embodiment of the present invention further provides an electromagnetic heating device, including an IGBT, where the IGBT includes a C pole, an E pole, and a G pole, and the electromagnetic heating device further includes:

the judging module 2 is used for judging the heating mode of the electromagnetic heating device;

the control module 1 is used for controlling the IGBT to be turned on by first driving voltage when the acquired heating mode of the electromagnetic heating device is a first power heating mode; and when the acquired heating mode of the electromagnetic heating device is a second power heating mode, controlling the IGBT to be switched on by second driving voltage, wherein the second driving voltage is greater than the first driving voltage.

Further, the apparatus further comprises:

the acquisition module 3 is used for detecting the voltage between CE poles of the IGBT in real time;

the judging module 2 is used for judging that the heating mode of the electromagnetic heating device is a first power heating mode if detecting that whether the voltage between CE electrodes of the IGBT is larger than 0; and if the voltage between the CE poles of the IGBT is detected to be less than or equal to zero, determining that the heating mode of the electromagnetic heating device is the second power heating mode.

Further, the apparatus further comprises:

the temperature detection module 4 is used for detecting the real-time temperature of the IGBT;

the control module 1 is further used for controlling to reduce the driving voltage of the IGBT after controlling the IGBT to be turned on by the first driving voltage, and acquiring real-time temperature values of the IGBT before and after the driving voltage is adjusted; when the difference value of the real-time temperature values of the IGBT after the driving voltage of the IGBT is adjusted and before the driving voltage of the IGBT is adjusted is larger than or equal to the preset temperature threshold value, the real-time temperature value of the IGBT is not reduced any more, and the IGBT is controlled to operate by the driving voltage before the driving voltage is adjusted.

Further, the control module 1 is further configured to control to increase the driving voltage of the IGBT after controlling the IGBT to be turned on with the second driving voltage, and obtain real-time temperature values of the IGBT before and after the driving voltage is adjusted; and when the difference value of the real-time temperature values of the IGBT after the drive voltage of the IGBT is adjusted and before the drive voltage of the IGBT is adjusted is larger than or equal to a preset temperature threshold value, controlling the IGBT to operate by adjusting the previous drive voltage.

Further, the judging module 2 is further configured to judge whether the IGBT is in a cold start stage;

the control module 1 is further configured to execute the program for determining the heating mode of the electromagnetic heating device if it is determined that the IGBT is not in the cold start stage; and if the IGBT is judged to be in the cold starting stage, controlling the IGBT to start with a third driving voltage.

Further, the judgment module 2 is further configured to control to reduce the driving voltage of the IGBT;

In the present embodiment, as shown in fig. 6, the control module 1 includes a microprocessor, the microprocessor is respectively connected to an IGBT driving circuit and a voltage regulating circuit, and the IGBT driving circuit is connected to the voltage regulating circuit, so as to regulate the driving voltage of the IGBT.

According to the electromagnetic heating device provided by the embodiment of the invention, different driving voltages are selected according to the starting mode of the IGBT and the heating power of the electromagnetic heating device, and the real-time temperature or the temperature rise rate of the IGBT is reduced to the minimum by gradually adjusting the driving voltage of the IGBT, so that the loss of the IGBT is reduced.

Those skilled in the art will appreciate that while some embodiments herein include some features included in other embodiments, rather than others, combinations of features of different embodiments are meant to be within the scope of the invention and form different embodiments. For example, in the claims, any of the claimed embodiments may be used in any combination.

Finally, it should be noted that: the above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.

Claims

1. An IGBT control method of an electromagnetic heating device is characterized by comprising the following steps:

acquiring the voltage between CE poles of the IGBT before the IGBT is started;

judging whether the voltage between CE poles of the IGBT is larger than zero before the IGBT is started, and if the voltage between the CE poles of the IGBT is larger than zero before the IGBT is started, judging that the heating mode of the electromagnetic heating device is a first power heating mode; if the voltage between CE poles of the IGBT is less than or equal to zero, judging that the heating mode of the electromagnetic heating device is a second power heating mode;

when the acquired heating mode of the electromagnetic heating device is a first power heating mode, controlling the IGBT to be switched on at a first driving voltage;

2. The IGBT control method for an electromagnetic heating apparatus according to claim 1, wherein after the IGBT is controlled to turn on at the first drive voltage, the method further comprises:

3. The IGBT control method for an electromagnetic heating apparatus according to claim 1, wherein after the IGBT is controlled to turn on at the second drive voltage, the method further comprises:

4. The IGBT control method for an electromagnetic heating apparatus according to claim 1, wherein before the determining the heating mode of the electromagnetic heating apparatus, the method further comprises:

judging whether the IGBT is in a cold start stage;

5. The IGBT control method of the electromagnetic heating device according to claim 4, wherein the determining whether the IGBT is in a cold start phase comprises:

acquiring the time interval of the IGBT starting at two adjacent times;

6. The IGBT control method for an electromagnetic heating apparatus according to claim 4, wherein after the IGBT is controlled to be started at the third drive voltage, the method further comprises:

controlling and reducing the driving voltage of the IGBT;

7. An electromagnetic heating device, comprising:

the judging module is used for judging whether the voltage between the CE poles of the IGBT is larger than zero before the IGBT is started, and if the voltage between the CE poles of the IGBT is larger than zero, judging that the heating mode of the electromagnetic heating device is a first power heating mode; if the voltage between CE poles of the IGBT is detected to be less than or equal to zero, determining that the heating mode of the electromagnetic heating device is a second power heating mode;

8. The electromagnetic heating apparatus according to claim 7, characterized in that the apparatus further comprises:

9. The electromagnetic heating device according to claim 8, wherein the control module is further configured to control to increase the driving voltage of the IGBT after controlling the IGBT to turn on at the second driving voltage, and obtain real-time temperature values of the IGBT before and after adjusting the driving voltage; when the difference value of the real-time temperature values of the IGBT after the driving voltage of the IGBT is adjusted and before the driving voltage of the IGBT is adjusted is larger than or equal to the preset temperature threshold value, the real-time temperature value of the IGBT is not reduced any more, and the IGBT is controlled to operate by the driving voltage before the driving voltage is adjusted.

10. The electromagnetic heating device according to claim 7, wherein the determining module is further configured to determine whether the IGBT is in a cold start phase;

11. The electromagnetic heating device according to claim 10, wherein the control module is further configured to control to reduce the driving voltage of the IGBT;