CN110418448B

CN110418448B - Electromagnetic heating cooking utensil and drive control circuit and control method of IGBT (insulated gate bipolar transistor) tube thereof

Info

Publication number: CN110418448B
Application number: CN201810389650.8A
Authority: CN
Inventors: 江德勇; 王云峰; 雷俊; 张帆; 黄庶锋; 任祥喜; 邓家华; 郑量; 杜放
Original assignee: Foshan Shunde Midea Electrical Heating Appliances Manufacturing Co Ltd
Current assignee: Foshan Shunde Midea Electrical Heating Appliances Manufacturing Co Ltd
Priority date: 2018-04-27
Filing date: 2018-04-27
Publication date: 2022-02-25
Anticipated expiration: 2038-04-27
Also published as: CN110418448A

Abstract

The invention discloses an electromagnetic heating cooking utensil and a drive control circuit and a control method of an IGBT tube thereof, wherein the circuit comprises: the master control chip outputs PPG signals through the control output port; IGBT driver chip, including the most value judge unit and drive output port, IGBT driver chip receives the PPG signal, and pass through drive output port output drive signal to IGBT pipe according to the PPG signal, with the turn-on or turn-off of drive IGBT pipe, and whether the PPG value that the drive IGBT pipe opened or the in-process of turn-off judges through the most value judge unit that the PPG signal corresponds is greater than minimum PPG value and is less than the biggest PPG value, wherein, when the PPG value that the PPG signal corresponds is less than or equal to minimum PPG value or the PPG value that the PPG signal corresponds is greater than or equal to the biggest PPG value, IGBT driver chip feeds back PPG signal to main control chip and appears unusual information, main control chip adjusts the PPG signal when receiving PPG signal through feedback port and appearing unusual information, thereby can realize the most value protect function, improve the reliability of IGBT pipe simultaneously.

Description

Electromagnetic heating cooking utensil and drive control circuit and control method of IGBT (insulated gate bipolar transistor) tube thereof

Technical Field

The invention relates to the technical field of household appliances, in particular to a drive control circuit of an Insulated Gate Bipolar Transistor (IGBT) tube in an electromagnetic heating cooking appliance, the electromagnetic heating cooking appliance and a drive control method of the IGBT tube in the electromagnetic heating cooking appliance.

Background

In the current electromagnetic heating system, an IGBT driving circuit is generally built by adopting a discrete device. However, for the simplification of the circuit, some circuits adopt a dedicated IGBT driving chip, and the IGBT is controlled to be turned on by connecting the main control chip and the driving chip, and these devices generally only implement the driving function of the IGBT. In the electromagnetic heating system, the working frequency is more than 20KHZ, and the power is up to 2100W, so the system interference is very large, which requires very high reliability of the system circuit, and if only a simple driving function is adopted, the system requirement can not be met.

Disclosure of Invention

The present invention is directed to solving, at least to some extent, one of the technical problems in the related art. Therefore, a first object of the present invention is to provide a driving control circuit for an IGBT in an electromagnetic heating cooking device, in a process that an IGBT driving chip drives an IGBT to turn on or off, a maximum value determining unit determines a PPG (Programmable Pulse Generator) value corresponding to a PPG signal, and feeds back a determination result to a main control chip, so that the main control chip adjusts the PPG signal according to the determination result, thereby implementing a maximum protection function and improving reliability of the IGBT.

A second object of the present invention is to provide an electromagnetic heating cooking appliance.

A third object of the present invention is to provide a driving control method of an IGBT tube in an electromagnetic heating cooking appliance.

In order to achieve the above object, a first embodiment of the present invention provides a driving control circuit for an IGBT tube in an electromagnetic heating cooking appliance, including: the main control chip comprises a control output port and a feedback port, and outputs a PPG signal through the control output port; the IGBT driving chip comprises a maximum judgment unit and a driving output port, the driving output port is connected to the G pole of the IGBT tube, the IGBT driving chip receives the PPG signal, and outputs a driving signal to the IGBT tube through the driving output port according to the PPG signal so as to drive the IGBT tube to be switched on or switched off, and judging whether the PPG value corresponding to the PPG signal is larger than the minimum PPG value and smaller than the maximum PPG value through the maximum value judging unit in the process of driving the IGBT tube to be switched on or switched off, wherein when the PPG value corresponding to the PPG signal is less than or equal to the minimum PPG value or the PPG value corresponding to the PPG signal is greater than or equal to the maximum PPG value, the IGBT driving chip feeds back the information that the PPG signal is abnormal to the main control chip, and the master control chip regulates the PPG signal when receiving the information that the PPG signal is abnormal through the feedback port.

According to the drive control circuit of the IGBT tube in the electromagnetic heating cooking utensil, the main control chip outputs PPG signals through the control output port, the IGBT drive chip receives the PPG signals and outputs drive signals to the IGBT tube through the drive output port according to the PPG signals, to drive the on or off of the IGBT tube, and in the process of driving the IGBT tube to be on or off, judging whether the PPG value corresponding to the PPG signal is larger than the minimum PPG value and smaller than the maximum PPG value by a maximum value judging unit, wherein, when the PPG value corresponding to the PPG signal is less than or equal to the minimum PPG value or the PPG value corresponding to the PPG signal is more than or equal to the maximum PPG value, the IGBT driving chip feeds back the information that the PPG signal is abnormal to the main control chip, and the main control chip adjusts the PPG signal when receiving the information that the PPG signal is abnormal through the feedback port, so that the maximum protection function can be realized, and the reliability of the IGBT tube is improved.

In addition, the drive control circuit of the IGBT tube in the electromagnetic heating cooking device according to the above embodiment of the present invention may further have the following additional technical features:

according to an embodiment of the invention, when the PPG value corresponding to the PPG signal is less than or equal to the minimum PPG value, the main control chip controls the PPG value corresponding to the PPG signal to increase.

According to an embodiment of the present invention, when the PPG value corresponding to the PPG signal is less than the minimum PPG value, the IGBT driver chip further forces the driver output port to output the driver signal corresponding to the minimum PPG value.

According to an embodiment of the invention, when the PPG value corresponding to the PPG signal is greater than or equal to the maximum PPG value, the main control chip controls the PPG value corresponding to the PPG signal to decrease.

According to an embodiment of the present invention, when the PPG value corresponding to the PPG signal is greater than the maximum PPG value, the IGBT driver chip further forces the driver output port to output the driver signal corresponding to the maximum PPG value.

According to an embodiment of the present invention, the drive control circuit of the IGBT tube in the electromagnetic heating cooking device further includes: and the synchronous detection unit is connected with the main control chip and outputs a synchronous detection signal to the main control chip by detecting the voltage at two ends of a resonance unit in the electromagnetic heating cooking appliance, so that the main control chip outputs the PPG signal according to the synchronous detection signal.

In order to achieve the above object, a second embodiment of the invention provides an electromagnetic heating cooking appliance, which includes the above drive control circuit for an IGBT tube in the electromagnetic heating cooking appliance.

According to the electromagnetic heating cooking utensil provided by the embodiment of the invention, the maximum protection function can be realized and the reliability of the IGBT tube is improved through the drive control circuit of the IGBT tube in the electromagnetic heating cooking utensil.

In order to achieve the above object, a third aspect of the present invention provides a driving control method for an IGBT tube in an electromagnetic heating cooking appliance, where a driving control circuit for the IGBT tube in the electromagnetic heating cooking appliance includes a main control chip and an IGBT driving chip, and the driving control method includes the following steps: the master control chip outputs PPG signals to the IGBT driving chip; the IGBT driving chip receives the PPG signal, outputs a driving signal to the IGBT tube according to the PPG signal so as to drive the IGBT tube to be switched on or switched off, and judges whether a PPG value corresponding to the PPG signal is larger than a minimum PPG value and smaller than a maximum PPG value in the process of driving the IGBT tube to be switched on or switched off; if the PPG value corresponding to the PPG signal is smaller than or equal to the minimum PPG value or the PPG value corresponding to the PPG signal is larger than or equal to the maximum PPG value, the IGBT driving chip feeds back information that the PPG signal is abnormal to the main control chip; and the master control chip regulates the PPG signal when receiving the information that the PPG signal is abnormal.

According to the drive control method of the IGBT tube in the electromagnetic heating cooking utensil, the main control chip outputs the PPG signal to the IGBT drive chip, the IGBT drive chip receives the PPG signal and outputs the drive signal to the IGBT tube according to the PPG signal so as to drive the IGBT tube to be switched on or switched off, and whether the PPG value corresponding to the PPG signal is larger than the minimum PPG value and smaller than the maximum PPG value or not is judged in the process of driving the IGBT tube to be switched on or switched off.

In addition, the driving control method for the IGBT tube in the electromagnetic heating cooking device according to the above embodiment of the present invention may further have the following additional technical features:

according to an embodiment of the invention, when the PPG value corresponding to the PPG signal is less than or equal to the minimum PPG value, the main control chip controls the PPG value corresponding to the PPG signal to decrease.

According to an embodiment of the present invention, when the PPG value corresponding to the PPG signal is greater than or equal to the maximum PPG value, the main control chip controls the PPG value corresponding to the PPG signal to increase.

Advantages of additional aspects of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention.

Drawings

Fig. 1 is a schematic diagram of a drive control circuit of an IGBT tube in an electromagnetic heating cooking appliance according to an embodiment of the present invention;

fig. 2 is a schematic diagram of a drive control circuit of an IGBT tube in an electromagnetic heating cooking appliance according to an embodiment of the present invention;

fig. 3 is a flowchart of a driving control method of an IGBT tube in an electromagnetic heating cooking appliance according to an embodiment of the present invention.

Detailed Description

Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are illustrative and intended to be illustrative of the invention and are not to be construed as limiting the invention.

A drive control circuit of an IGBT tube in an electromagnetic heating cooking appliance, and a drive control method of an IGBT tube in an electromagnetic heating cooking appliance proposed according to an embodiment of the present invention are described below with reference to the drawings.

Fig. 1 is a schematic diagram of a drive control circuit of an IGBT tube in an electromagnetic heating cooking appliance according to an embodiment of the present invention. Fig. 2 is a circuit diagram of an electromagnetic heating cooking appliance heating system according to an embodiment of the present invention.

As shown in fig. 1 and 2, the drive control circuit of the IGBT tube in the electromagnetic heating cooking appliance may include: a main control chip 10 and an IGBT driving chip 20.

The main control chip 10 may include a control output port 11 and a feedback port 12, and the main control chip 10 outputs the PPG signal through the control output port 11. IGBT drive chip 20 can include a most value judgment unit 21 and a drive output port 22, drive output port 22 is connected to the G utmost point of IGBT pipe, IGBT drive chip 20 receives PPG signal, and output drive signal to IGBT pipe through drive output port 22 according to PPG signal, in order to drive the opening or shutting of IGBT pipe, and in the process of driving IGBT pipe to open or shut, judge whether PPG value that PPG signal corresponds is greater than minimum PPG value and less than maximum PPG value through most value judgment unit 21, wherein, when PPG value that PPG signal corresponds is less than or equal to minimum PPG value or PPG value that PPG signal corresponds is greater than or equal to maximum PPG value, IGBT drive chip 20 feeds back PPG signal information that PPG signal appears unusually to main control chip 10, main control chip 10 receives PPG signal information that PPG signal appears unusually through feedback port 12, adjust PPG signal. In one embodiment of the present invention, the main control chip 10 and the IGBT driving chip 20 may be integrally provided as a single body.

In some embodiments of the present invention, the IGBT driver chip 20 may further include a storage unit 22, the storage unit 22 is connected to the maximum value determining unit 21, the maximum PPG value and the minimum PPG value are stored in the storage unit 22, and the maximum value determining unit 21 determines a relationship between the PPG value corresponding to the PPG signal and the maximum PPG value and the minimum PPG value, respectively, to generate a determination result. The maximum PPG value and the minimum PPG value may be calibrated according to actual conditions, for example, the maximum PPG value and the minimum PPG value of the driving signal corresponding to the case where the IGBT loss is minimum and the reliability is the best may be used.

Specifically, after the electromagnetic heating cooking appliance is powered on to work, a series of processing including filtering processing, rectification processing (converting alternating current into pulsating direct current) and the like is performed on the input alternating current commercial power until a stable direct current voltage is output to the resonant circuit. The main control chip 10 outputs a PPG signal through the control output port 11, and the IGBT driving chip 20 receives the PPG signal and outputs a driving signal PPG _ OUT to the IGBT tube through the driving output port 22 to drive the IGBT tube to be turned on or off. In the process of driving the IGBT tube to be turned on or off, the IGBT driver chip 20 determines a PPG value corresponding to the PPG signal (the PPG signal is a pulse signal realizing different duty ratios, the duty ratio is a ratio of on-time to total time in a pulse cycle, and the PPG value corresponding to the PPG signal is on-time) by the maximum value determination module 21, so that when abnormal information occurs in the PPG signal, the abnormal information is fed back to the main control chip 10, and when the abnormal information occurs in the PPG signal, the main control chip 10 adjusts the PPG signal by receiving the abnormal information in the PPG signal through the feedback port 12.

For example, the maximum value determining unit 21 determines a magnitude relationship between a PPG value corresponding to the PPG signal and a maximum PPG value and a minimum PPG value stored in advance, when the PPG value corresponding to the PPG signal is less than or equal to the minimum PPG value or the PPG value corresponding to the PPG signal is greater than or equal to the maximum PPG value, it determines that the PPG signal is abnormal, the IGBT driver chip 20 outputs a code FB of 1 to the main controller chip 10, and when the FB is received by the main controller chip 10, it determines that the PPG signal is abnormal, and at this time, the PPG signal is adjusted, for example, when the PPG value corresponding to the PPG signal is less than or equal to the minimum PPG value, the PPG value corresponding to the PPG signal is increased; and when the PPG value corresponding to the PPG signal is larger than or equal to the maximum PPG value, reducing the PPG value corresponding to the PPG signal. When the PPG value corresponding to the PPG signal is greater than the minimum PPG value and less than the maximum PPG value, it is determined that the PPG signal is normal, the IGBT driver chip 20 outputs a code FB equal to 0 to the main control chip 10, and when the main control chip 10 receives FB equal to 0, it is determined that the PPG signal is normal, and the PPG value corresponding to the current PPG signal is kept unchanged.

The following describes how the master control chip 10 adjusts the PPG signal when abnormal information occurs in the PPG signal.

According to an embodiment of the present invention, when the PPG value corresponding to the PPG signal is less than or equal to the minimum PPG value, the main control chip 10 controls the PPG value corresponding to the PPG signal to increase. When the PPG value corresponding to the PPG signal is smaller than the minimum PPG value, the IGBT driver chip 20 also forces the output port to output the driving signal corresponding to the minimum PPG value.

That is to say, when the maximum value determining unit 21 determines that the PPG value corresponding to the PPG signal is less than or equal to the minimum PPG value, the IGBT driver chip 20 outputs the code FB of 1 to the main control chip 10, and the main control chip 10 receives the FB of 1, determines that the PPG signal is abnormal, and controls the PPG value corresponding to the PPG signal to increase; when the maximum value judging unit 21 judges that the PPG value corresponding to the PPG signal is smaller than the minimum PPG value, the IGBT driver chip directly forces to output the driving signal corresponding to the minimum PPG value, so as to drive the IGBT tube to be turned on or off. Therefore, the situation that insufficient resonance energy is caused by the fact that the IGBT driving signal is too short (the PPG value corresponding to the PPG signal is too small) and the IGBT tube is too high in leading-in voltage and current can be effectively prevented, so that the IGBT tube is overheated and even burnt out due to overheating.

According to another embodiment of the present invention, when the PPG value corresponding to the PPG signal is greater than or equal to the maximum PPG value, the main control chip 10 controls the PPG value corresponding to the PPG signal to decrease. When the PPG value corresponding to the PPG signal is greater than the maximum PPG value, the IGBT driver chip 20 also forces the output port to output the driving signal corresponding to the maximum PPG value.

That is to say, when the maximum value determining unit 21 determines that the PPG value corresponding to the PPG signal is greater than or equal to the maximum PPG value, the IGBT driver chip 20 outputs the code FB of 1 to the main control chip 10, and the main control chip 10 receives the FB of 1, determines that the PPG signal is abnormal, and controls the PPG value corresponding to the PPG signal to decrease; when the maximum value judging unit 21 judges that the PPG value corresponding to the PPG signal is greater than the maximum PPG value, the IGBT driver chip directly forces to output the driving signal corresponding to the maximum PPG value, so as to drive the IGBT tube to be turned on or off. Therefore, the IGBT conduction current increase caused by the overlong IGBT driving signal (the PPG value corresponding to the PPG signal is overlarge) can be effectively prevented, the resonance energy is increased, the resonance voltage is overhigh, and the IGBT tube is burnt out due to the overlarge current or the overhigh voltage of a C pole (collector).

According to an embodiment of the present invention, as shown in fig. 2, the drive control circuit of the IGBT tube in the electromagnetic heating cooking apparatus may further include: and a synchronous detection unit 30, wherein the synchronous detection unit 30 is connected with the main control chip 10, and the synchronous detection unit 30 outputs a synchronous detection signal to the main control chip 10 by detecting the voltage at two ends of the resonance unit 40 in the electromagnetic heating cooking appliance, so that the main control chip 10 outputs a PPG signal according to the synchronous detection signal.

The resonant unit 40 may include a resonant capacitor C3 and a coil panel L2 connected in parallel, one end of the resonant capacitor C3 and the coil panel L2 connected in parallel is connected to a power supply unit of the electromagnetic heating cooking appliance, the other end of the resonant capacitor C3 and the coil panel L2 connected in parallel is connected to a C pole of the IGBT tube, and an E pole of the IGBT tube is grounded. When the IGBT is turned on or off, the voltage across the coil panel L2 changes abruptly, causing resonance, and the coil panel L2 heats up in resonance.

Further, in an embodiment of the present invention, as shown in fig. 2, the synchronization detecting unit 30 may include: the circuit comprises a first resistor R1, a second resistor R2, a first capacitor C1, a third resistor R3, a fourth resistor R4, a second capacitor C2 and a comparator CMP. One end of the first resistor R1 is connected to one end of the resonant capacitor C3 connected in parallel with the coil panel L2. One end of the second resistor R2 is connected to the other end of the first resistor R1 and has a first node J1, and the other end of the second resistor R2 is grounded. The first capacitor C1 is connected in parallel with the second resistor R2. One end of the third resistor R3 is connected to the other end of the resonant capacitor C3 and the coil panel L2 connected in parallel. One end of the fourth resistor R4 is connected to the other end of the third resistor R3 and has a second node J2, and the other end of the fourth resistor R4 is grounded. The second capacitor C2 is connected in parallel with the fourth resistor R4. A positive input terminal of the comparator CMP is connected to the second node J2, a negative input terminal of the comparator CMP is connected to the first node J1, and an output terminal of the comparator CMP is used to output the sync detection signal.

In some embodiments of the present invention, the comparator CMP may be integrated in the main control chip 10.

That is, the voltage across the resonant unit 40 refers to the voltage across the resonant capacitor C3 and the coil disc L2 after being connected in parallel, i.e., the voltage at points a and B in fig. 2. In the process of acquiring the synchronous detection signal, the synchronous detection unit 30 may obtain the synchronous detection signal according to the voltage variation degree of the point a (i.e. the resonance amplitude of the point a) because the voltage variation at the point B is not obvious during the resonance process, and the voltage at the point a may change suddenly. Synchronous detection unit 30 outputs synchronous detection signal to main control chip 10, main control chip 10 outputs PPG signal to IGBT driver chip 20 according to synchronous detection signal, IGBT driver chip 20 outputs drive signal to IGBT pipe according to PPG signal to drive opening or shutting of IGBT pipe, and judge the size relation between the PPG value that the PPG signal corresponds and minimum PPG value and the biggest PPG value through the most value judge unit 21, so that main control chip adjusts the PPG signal according to the judged result.

In summary, according to the driving control circuit of the IGBT tube in the electromagnetic heating cooking device in the embodiment of the present invention, the main control chip outputs the PPG signal through the control output port, the IGBT driving chip receives the PPG signal, and outputs the driving signal to the IGBT tube through the driving output port according to the PPG signal to drive the IGBT tube to be turned on or turned off, and in the process of driving the IGBT tube to be turned on or turned off, the maximum value determining unit determines whether the PPG value corresponding to the PPG signal is greater than the minimum PPG value and less than the maximum PPG value, wherein when the PPG value corresponding to the PPG signal is less than or equal to the minimum PPG value or the PPG value corresponding to the PPG signal is greater than or equal to the maximum PPG value, the IGBT driving chip feeds back information that the PPG signal is abnormal to the main control chip, and the main control chip adjusts the PPG signal when receiving the information that the PPG signal is abnormal through the feedback port, so as to achieve the maximum protection function, and meanwhile, the reliability of the IGBT tube is improved.

In addition, the embodiment of the invention also provides an electromagnetic heating cooking appliance, which comprises the drive control circuit of the IGBT tube in the electromagnetic heating cooking appliance.

Fig. 3 is a flowchart of a driving control method of an IGBT tube in an electromagnetic heating cooking appliance according to an embodiment of the present invention. In one embodiment of the invention, the drive control circuit of the IGBT tube in the electromagnetic heating cooking appliance comprises a main control chip and an IGBT drive chip.

As shown in fig. 3, the method for controlling driving of an IGBT tube in an electromagnetic heating cooking device according to an embodiment of the present invention may include the steps of:

and S1, the master control chip outputs the PPG signal to the IGBT driving chip.

And S2, the IGBT driving chip receives the PPG signal and outputs a driving signal to the IGBT tube according to the PPG signal so as to drive the IGBT tube to be switched on or switched off, and whether the PPG value corresponding to the PPG signal is larger than the minimum PPG value and smaller than the maximum PPG value is judged in the process of driving the IGBT tube to be switched on or switched off.

And S3, if the PPG value corresponding to the PPG signal is less than or equal to the minimum PPG value or the PPG value corresponding to the PPG signal is greater than or equal to the maximum PPG value, the IGBT driving chip feeds back information that the PPG signal is abnormal to the main control chip.

And S4, the main control chip adjusts the PPG signal when receiving the information that the PPG signal is abnormal.

According to one embodiment of the invention, when the PPG value corresponding to the PPG signal is less than or equal to the minimum PPG value, the main control chip controls the PPG value corresponding to the PPG signal to decrease.

According to one embodiment of the invention, when the PPG value corresponding to the PPG signal is less than the minimum PPG value, the IGBT driver chip further forces the output port to output the driving signal corresponding to the minimum PPG value.

According to one embodiment of the invention, when the PPG value corresponding to the PPG signal is greater than or equal to the maximum PPG value, the main control chip controls the PPG value corresponding to the PPG signal to increase.

According to one embodiment of the invention, when the PPG value corresponding to the PPG signal is greater than the maximum PPG value, the IGBT driver chip further forces the output port to output the driving signal corresponding to the maximum PPG value.

It should be noted that details that are not disclosed in the method for driving and controlling the IGBT tube in the electromagnetic heating cooking appliance according to the embodiment of the present invention refer to details that are disclosed in the circuit for driving and controlling the IGBT tube in the electromagnetic heating cooking appliance according to the embodiment of the present invention, and are not repeated here.

In the description of the present invention, it is to be understood that the terms "central," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," "circumferential," and the like are used in the orientations and positional relationships indicated in the drawings for convenience in describing the invention and to simplify the description, and are not intended to indicate or imply that the referenced devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and are therefore not to be considered limiting of the invention.

Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present invention, "a plurality" means at least two, e.g., two, three, etc., unless specifically limited otherwise.

In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can, for example, be fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; they may be directly connected or indirectly connected through intervening media, or they may be connected internally or in any other suitable relationship, unless expressly stated otherwise. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.

In the present invention, unless otherwise expressly stated or limited, the first feature "on" or "under" the second feature may be directly contacting the first and second features or indirectly contacting the first and second features through an intermediate. Also, a first feature "on," "over," and "above" a second feature may be directly or diagonally above the second feature, or may simply indicate that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature may be directly under or obliquely under the first feature, or may simply mean that the first feature is at a lesser elevation than the second feature.

In the description herein, references to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above are not necessarily intended to refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, various embodiments or examples and features of different embodiments or examples described in this specification can be combined and combined by one skilled in the art without contradiction.

Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention, and that variations, modifications, substitutions and alterations can be made to the above embodiments by those of ordinary skill in the art within the scope of the present invention.

Claims

1. A drive control circuit of an IGBT tube in an electromagnetic heating cooking appliance is characterized by comprising:

the main control chip comprises a control output port and a feedback port, and outputs a PPG signal through the control output port;

the IGBT driving chip comprises a maximum value judging unit and a driving output port, the driving output port is connected to the G pole of the IGBT tube, the IGBT driving chip receives the PPG signal and outputs a driving signal to the IGBT tube through the driving output port according to the PPG signal so as to drive the IGBT tube to be switched on or switched off, and the maximum value judging unit judges whether the PPG value corresponding to the PPG signal is larger than the minimum PPG value and smaller than the maximum PPG value or not in the process of driving the IGBT tube to be switched on or switched off, wherein,

when the PPG value corresponding to the PPG signal is smaller than or equal to the minimum PPG value or the PPG value corresponding to the PPG signal is larger than or equal to the maximum PPG value, the IGBT driving chip feeds back information that the PPG signal is abnormal to the main control chip, and the main control chip adjusts the PPG signal when receiving the information that the PPG signal is abnormal through the feedback port.

2. The driving control circuit of the IGBT tube in the electromagnetic heating cooking utensil as claimed in claim 1, wherein when the PPG value corresponding to the PPG signal is less than or equal to the minimum PPG value, the main control chip controls the PPG value corresponding to the PPG signal to increase.

3. The driving control circuit of the IGBT tube in the electromagnetic heating cooking device according to claim 2, wherein when the PPG value corresponding to the PPG signal is smaller than the minimum PPG value, the IGBT driving chip further forces the driving output port to output the driving signal corresponding to the minimum PPG value.

4. The driving control circuit of the IGBT tube in the electromagnetic heating cooking utensil as claimed in claim 1, wherein when the PPG value corresponding to the PPG signal is greater than or equal to the maximum PPG value, the main control chip controls the PPG value corresponding to the PPG signal to be reduced.

5. The driving control circuit of the IGBT tube in the electromagnetic heating cooking utensil as claimed in claim 4, wherein when the PPG value corresponding to the PPG signal is greater than the maximum PPG value, the IGBT driving chip further forces the driving output port to output the driving signal corresponding to the maximum PPG value.

6. The induction heating cooking appliance of any one of claims 1 to 5, wherein the drive control circuit of the IGBT tube further comprises:

and the synchronous detection unit is connected with the main control chip and outputs a synchronous detection signal to the main control chip by detecting the voltage at two ends of a resonance unit in the electromagnetic heating cooking appliance, so that the main control chip outputs the PPG signal according to the synchronous detection signal.

7. An electromagnetic heating cooking appliance, characterized by comprising the drive control circuit of the IGBT tube in the electromagnetic heating cooking appliance according to any one of claims 1 to 6.

8. A driving control method of an IGBT tube in an electromagnetic heating cooking appliance is characterized in that a driving control circuit of the IGBT tube in the electromagnetic heating cooking appliance comprises a main control chip and an IGBT driving chip, and the driving control method comprises the following steps:

the master control chip outputs PPG signals to the IGBT driving chip;

the IGBT driving chip receives the PPG signal, outputs a driving signal to the IGBT tube according to the PPG signal so as to drive the IGBT tube to be switched on or switched off, and judges whether a PPG value corresponding to the PPG signal is larger than a minimum PPG value and smaller than a maximum PPG value in the process of driving the IGBT tube to be switched on or switched off;

if the PPG value corresponding to the PPG signal is smaller than or equal to the minimum PPG value or the PPG value corresponding to the PPG signal is larger than or equal to the maximum PPG value, the IGBT driving chip feeds back information that the PPG signal is abnormal to the main control chip;

and the master control chip regulates the PPG signal when receiving the information that the PPG signal is abnormal.

9. The driving control method according to claim 8, wherein when the PPG value corresponding to the PPG signal is less than or equal to the minimum PPG value, the main control chip controls the PPG value corresponding to the PPG signal to decrease.

10. The drive control method of claim 9, wherein when the PPG value corresponding to the PPG signal is less than the minimum PPG value, the IGBT driver chip further forces the drive output port to output the drive signal corresponding to the minimum PPG value.

11. The driving control method according to claim 8, wherein when the PPG value corresponding to the PPG signal is greater than or equal to the maximum PPG value, the main control chip controls the PPG value corresponding to the PPG signal to increase.

12. The drive control method of claim 11, wherein when the PPG value corresponding to the PPG signal is greater than the maximum PPG value, the IGBT driver chip further forces the drive output port to output the drive signal corresponding to the maximum PPG value.