IGBT protection device and air conditioner

Abstract

The present application provides an IGBT protection device and an air conditioner, wherein the protection device includes a protection module, an input end of the protection module is used to be electrically connected to a power supply, an output end of the protection module is used to be electrically connected to a gate of the IGBT, and the power supply is used to power the IGBT, thereby achieving the effect of effectively protecting the IGBT in the event of an abnormal short circuit in the IGBT.

Description

Technical Field

[0001] The present application relates to the field of circuit protection, and in particular to an IGBT protection device and an air conditioner. Background Art

[0002] As a composite power electronic device, the Insulated Gate Bipolar Transistor (IGBT) is widely used in frequency converters, inverters, electric vehicle drive systems, etc. due to its advantages of high input impedance, low on-state voltage drop, high voltage and high current. However, IGBT may encounter short circuit faults during operation. Once such faults occur, the current will increase sharply and generate a lot of heat, which may damage the IGBT device and even have a serious impact on the entire circuit system.

[0003] Therefore, how to effectively protect IGBTs that have short-circuit faults is a technical problem that urgently needs to be solved. Summary of the invention

[0004] The main purpose of the present application is to provide an IGBT protection device and an air conditioner, so as to at least solve the problem in the prior art that it is difficult to effectively protect an IGBT that has a short-circuit fault.

[0005] In order to achieve the above-mentioned purpose, according to one aspect of the present application, a protection device for an IGBT is provided, the protection device comprising: a protection module, the input end of the protection module is used to be electrically connected to a power supply, the output end of the protection module is used to be electrically connected to a gate of the IGBT, the protection module is used to shut down when a short circuit abnormality occurs in the IGBT, and to turn on when no short circuit abnormality occurs in the IGBT, and the power supply is used to supply power to the IGBT.

[0006] Optionally, the protection module includes: a first voltage divider device, wherein the first end of the first voltage divider device is the input end of the protection module; a current limiting device, wherein the first end of the current limiting device is electrically connected to the first end of the first voltage divider device; a first switch device, including a control end, a first end, and a second end, wherein the control end of the first switch device is electrically connected to the second end of the first voltage divider device, the first end of the first switch device is electrically connected to the second end of the current limiting device, and the second end of the first switch device is the output end of the protection module; a second switch device, including a control end, a first end, and a second end, wherein the control end of the second switch device is electrically connected to the second end of the current limiting device, the first end of the second switch device is electrically connected to the first end of the current limiting device, and the second end of the second switch device is the output end of the protection module.

[0007] Optionally, the protection module further includes: a second voltage divider device, a first end of the second voltage divider device is electrically connected to a second end of the first voltage divider device, and a second end of the second voltage divider device is grounded.

[0008] Optionally, a resistance value of the first voltage divider device is greater than a resistance value of the second voltage divider device.

[0009] Optionally, the first voltage divider and the current limiting device respectively include at least one of the following: a resistor, an inductor, and a capacitor.

[0010] Optionally, the first switching device includes at least one of the following: a MOS tube, a triode, and a thyristor.

[0011] Optionally, the second switching device includes at least one of the following: a MOS tube, a triode, and a thyristor.

[0012] Optionally, the first switching device includes: a first NPN transistor, the base of the first NPN transistor is electrically connected to the second end of the first voltage divider device, the collector of the first NPN transistor is electrically connected to the second end of the current limiting device, and the emitter of the first NPN transistor is the output end of the protection module.

[0013] Optionally, the second switching device includes: a second NPN transistor, the base of the second NPN transistor is electrically connected to the second end of the current limiting device, the collector of the second NPN transistor is electrically connected to the first end of the current limiting device, and the emitter of the second NPN transistor is the output end of the protection module.

[0014] According to another aspect of the present application, an air conditioner is provided, comprising: an inverter, wherein the inverter comprises an IGBT and a protection device for the IGBT, and the protection device is any one of the IGBT protection devices described above.

[0015] By applying the technical solution of the present application, the circuit is turned off when a short circuit abnormality occurs in the IGBT, and is turned on when a short circuit abnormality does not occur in the IGBT, thereby achieving the effect of effectively protecting the IGBT when a short circuit abnormality occurs in the IGBT. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The drawings constituting part of the present application are used to provide a further understanding of the present application. The exemplary embodiments and descriptions of the present application are used to explain the present application and do not constitute an improper limitation on the present application. In the drawings:

[0017] Figure 1 A structural diagram of an IGBT protection device provided in an embodiment of the present application is shown;

[0018] Figure 2 A specific circuit structure diagram of an IGBT protection device provided according to an embodiment of the present application is shown.

[0019] The above drawings include the following reference numerals:

[0020] 10. Protection module; 12. First voltage divider; 14. Current limiting device; 16. Second voltage divider; 18. Second switch device; 20. First switch device; 22. IGBT; 24. Load; 26. External power supply. DETAILED DESCRIPTION

[0021] It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of the present application can be combined with each other. The present application will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0022] In order to enable those skilled in the art to better understand the solution of the present application, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the present application.

[0023] It should be noted that the terms "first", "second", etc. in the specification and claims of the present application and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequential order. It should be understood that the data used in this way can be interchanged where appropriate, so that the embodiments of the present application described here. In addition, the terms "including" and "having" and any of their variations are intended to cover non-exclusive inclusions, for example, a process, method, system, product or device comprising a series of steps or units is not necessarily limited to those steps or units clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0024] As introduced in the background technology, IGBT may encounter a short circuit fault during operation. Once such a fault occurs, the current will increase sharply and generate a large amount of heat, which may damage the IGBT device and even have a serious impact on the entire circuit system. In order to solve the above technical problems, the embodiments of the present application provide an IGBT protection device and an air conditioner.

[0025] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the accompanying drawings in the embodiments of the present invention.

[0026] The embodiment of the present application provides an IGBT protection device, Figure 1 A structural block diagram of the IGBT protection device of the present application is shown as an example. Figure 1 As shown, the above-mentioned IGBT protection device includes:

[0027] The protection module 10 has an input end for electrically connecting to a power supply, an output end for electrically connecting to a gate of the IGBT 22, the protection module 10 is used to shut down when a short circuit occurs to the IGBT 22, and to turn on when no short circuit occurs to the IGBT 22, and the power supply is used to supply power to the IGBT 22.

[0028] Specifically, Figure 1 As shown, the input end of the protection module is connected to the positive electrode DC+ of the power supply, and the power supply is electrically connected to the gate of the IGBT22 through the protection module. The power supply is used to provide a driving signal to the IGBT22 to control the on or off of the IGBT22.

[0029] Through the above embodiment, in the above IGBT protection device, the input end of the above protection module is connected to the above power supply, and the output end of the above protection module is connected to the gate of the above IGBT. When the above IGBT has a short circuit abnormality, the above protection module is turned off, thereby disconnecting the electrical connection between the above IGBT and the above power supply. When the above IGBT does not have a short circuit abnormality, the above protection module is turned on, which does not affect the electrical connection between the above IGBT and the above power supply, nor does it affect the normal operation of the IGBT. The protection module is turned off when the above IGBT has a short circuit abnormality, and is turned on when the above IGBT does not have a short circuit abnormality, thereby achieving the effect of not interfering with the normal operation of the IGBT when the IGBT does not have a short circuit abnormality, and cutting off the effective protection of the IGBT when the IGBT has a short circuit abnormality, thereby avoiding the problem that the IGBT is damaged by the short circuit abnormality and even affects the circuit system in which it is located.

[0030] In one alternative, Figure 2As shown, the protection module 10 includes: a first voltage divider device 12, wherein the first end of the first voltage divider device 12 is the input end of the protection module 10; a current limiting device 14, wherein the first end of the current limiting device 14 is electrically connected to the first end of the first voltage divider device 12; a first switch device 20, including a control end, a first end, and a second end, wherein the control end of the first switch device 20 is electrically connected to the second end of the first voltage divider device 12, the first end of the first switch device 20 is electrically connected to the second end of the current limiting device 14, and the second end of the first switch device 20 is the output end of the protection module 10; a second switch device 18, including a control end, a first end, and a second end, wherein the control end of the second switch device 18 is electrically connected to the second end of the current limiting device 14, the first end of the second switch device 18 is electrically connected to the first end of the current limiting device 14, and the second end of the second switch device 18 is the output end of the protection module 10.

[0031] In the above embodiment, when the above IGBT does not have a short-circuit abnormality, by reasonably setting the resistance values ​​of the above-mentioned first voltage divider device and the above-mentioned current limiting device, the difference between the control terminal voltage of the above-mentioned first switching device and the second terminal voltage of the above-mentioned first switching device is smaller than the on-voltage of the above-mentioned first switching device, and the above-mentioned first switching device cannot be turned on and is in a cut-off state, while the difference between the control terminal voltage of the above-mentioned second switching device and the second terminal voltage of the above-mentioned second switching device is not smaller than the on-voltage of the above-mentioned second switching device, and the above-mentioned second switching device is in a conducting state, so the current can normally pass through the above-mentioned second switching device and flow to the above-mentioned IGBT to supply power to the above-mentioned IGBT. When a short circuit abnormality occurs in the above-mentioned IGBT, the second end of the above-mentioned first switching device is equivalent to being grounded, and the difference between the control terminal voltage of the above-mentioned first switching device and the second terminal voltage of the above-mentioned first switching device is not less than its on-state voltage. Therefore, the above-mentioned first switching device is turned on and is in the on state. At this time, the difference between the control terminal voltage of the second switching device and the second terminal voltage of the second switching device is less than its on-state voltage. Therefore, the above-mentioned second switching device cannot be turned on, and the current cannot flow to the IGBT, thereby achieving the effect of cutting off the connection between the above-mentioned IGBT and the above-mentioned power supply, and further preventing the above-mentioned IGBT from being broken down due to the short circuit abnormality.

[0032] Those skilled in the art can flexibly set the resistance values ​​of the first voltage divider and the current limiting device. In an exemplary embodiment, the resistance value of the first voltage divider is less than the resistance value of the current limiting device. In this way, when the IGBT does not have a short circuit anomaly, the control terminal voltage of the first switch device is less than the turn-on voltage, so that the first switch device cannot be turned on, further ensuring that the protection module will not affect the IGBT when the IGBT is working normally.

[0033] Specifically, Figure 2As shown, the protection module 10 further includes: a second voltage divider 16 , a first end of the second voltage divider 16 is electrically connected to a second end of the first voltage divider 12 , and a second end of the second voltage divider 16 is grounded.

[0034] In the above embodiment, by reasonably configuring the resistance values ​​of the above-mentioned first voltage divider device, the above-mentioned second voltage divider device and the above-mentioned current limiting device, it is further ensured that the above-mentioned first switch device is turned off when no short circuit abnormality occurs, and is turned on when a short circuit abnormality occurs. In this way, the above-mentioned first switch device is combined with the above-mentioned second switch device to further achieve the effect of disconnecting the protection module when the above-mentioned IGBT is short-circuited abnormally, and turning on the protection module when the above-mentioned IGBT is not short-circuited abnormally.

[0035] Furthermore, the resistance value of the first voltage divider device 12 is greater than the resistance value of the second voltage divider device 16 .

[0036] In the above embodiment, when the above IGBT does not have a short-circuit abnormality, since the resistance of the first voltage-dividing device is greater than the resistance of the above second voltage-dividing device, the control terminal voltage of the above first switching device is less than the turn-on voltage, so that the first switching device cannot be turned on, while the above second switching device is turned on, which not only further realizes the turn-on function of the above protection module when the above IGBT does not have a short-circuit abnormality, but also further achieves the effect that the protection module will not affect the normal operation of the circuit when the above IGBT does not have a short-circuit abnormality.

[0037] Those skilled in the art can flexibly select the specific structures of the first voltage divider and the current limiting device according to actual conditions, as long as the first voltage divider achieves the corresponding voltage dividing effect and the current limiting device achieves the corresponding current limiting effect.

[0038] According to some other optional solutions of the present application, the first voltage divider device and the current limiting device respectively include at least one of the following: a resistor, an inductor, and a capacitor.

[0039] In the above embodiment, the resistor is a common voltage divider device, which can effectively distribute the input voltage to different circuit parts through its stable resistance characteristics. The inductor has an inductive reactance characteristic and can respond to voltage changes, thereby playing a role in voltage division. The storage and release of the capacitor on the charge can smooth the voltage fluctuation and can also participate in the voltage division process.

[0040] It should be noted that, according to the specific needs and design considerations of the circuit, one or more combinations of the above-mentioned resistors, inductors, and capacitors can be selected as voltage divider devices to achieve a more precise and stable voltage divider effect, so that the above-mentioned IGBT protection device can better adapt to different working environments and conditions, thereby improving the reliability and stability of the above-mentioned IGBT protection device.

[0041] The first voltage divider device and the current limiting device may be of the same type or different types.

[0042] In the exemplary embodiments of the present application, Figure 2 As shown, the first voltage divider and the current limiting device are both resistors. Specifically, the first voltage divider may include only one resistor or multiple resistors connected in series and parallel; similarly, the current limiting device may include only one resistor or multiple resistors connected in series and parallel. The number of resistors and the connection relationship of the resistors in the first voltage divider and the current limiting device are specifically determined by the required resistance values ​​of the two.

[0043] Those skilled in the art can flexibly select the specific structure of the second voltage divider device according to actual conditions, as long as the second voltage divider device can achieve the corresponding voltage dividing effect.

[0044] According to some other optional solutions of the present application, the second voltage divider device includes at least one of the following: a resistor, an inductor, and a capacitor.

[0045] In an exemplary embodiment of the present application, Figure 2 As shown, the second voltage divider device is a resistor. Specifically, the second voltage divider device may include only one resistor, or may include multiple resistors connected in series and parallel. The number of resistors in the second voltage divider device and the resistor connection relationship are specifically determined by the required resistance values ​​of the two.

[0046] According to some other optional schemes of the present application, the first switch device includes at least one of the following: MOS tube, triode, thyristor. In the above embodiments, the MOS tube, triode, thyristor are all three-terminal switch tubes, having a control terminal, a first terminal (such as a collector or a drain) and a second terminal (such as an emitter or a source), and the signal input through the control terminal can achieve the effect of controlling the on and off state between the first terminal and the second terminal.

[0047] According to some other optional schemes of the present application, the second switch device includes at least one of the following: MOS tube, triode, thyristor. In the above embodiments, the MOS tube, triode, thyristor are all three-terminal switch tubes, having a control terminal, a first terminal (such as a collector or a drain) and a second terminal (such as an emitter or a source), and the signal input through the control terminal can achieve the effect of controlling the on and off state between the first terminal and the second terminal.

[0048] MOS tubes have the advantages of high input impedance, low power consumption in the switching state, can be expanded to smaller feature sizes, can be integrated into large-scale integrated circuits, and can achieve fast switching actions. Transistors can provide large current gain, have good current amplification capabilities, and have low manufacturing costs. They are suitable for large-scale production. Their design can resist the influence of temperature changes to a certain extent, maintain stable performance, and can be widely used in analog circuits and digital circuits. Thyristors can withstand high voltages and high currents, have high power capacity, can control the conduction of large currents through small signals, and as contactless semiconductor devices, thyristors avoid problems such as wear and noise caused by mechanical contact.

[0049] The switch tube types of the first switch tube and the second switch tube may be the same or different. For example, when the first switch tube is a MOS tube, the second switch tube may be a triode, a thyristor, or a MOS tube. When the first switch tube is a triode, the second switch tube may be a triode, a thyristor, or a MOS tube. When the first switch tube is a thyristor, the second switch tube may be a triode, a thyristor, or a MOS tube.

[0050] Those skilled in the art can flexibly select any feasible three-terminal switch device as the first switch device and the second switch device according to actual conditions.

[0051] According to some other optional schemes of the present application, the above-mentioned first switching device includes: a first NPN transistor, the base of the above-mentioned first NPN transistor is electrically connected to the second end of the above-mentioned first voltage divider device, the collector of the above-mentioned first NPN transistor is electrically connected to the second end of the above-mentioned current limiting device, and the emitter of the above-mentioned first NPN transistor is the output end of the above-mentioned protection module.

[0052] In the above embodiment, when the above IGBT does not have a short-circuit abnormality, by reasonably setting the resistance values ​​of the above-mentioned first voltage divider device and the above-mentioned second voltage divider device, the difference between the base voltage of the above-mentioned first NPN transistor and the emitter voltage of the above-mentioned first NPN transistor is less than the conduction voltage of the above-mentioned first NPN transistor, and the above-mentioned first NPN transistor cannot be turned on and is in a cut-off state. When the above-mentioned IGBT has a short-circuit abnormality, the emitter of the above-mentioned first NPN transistor is equivalent to being grounded, and the difference between the base voltage of the above-mentioned first NPN transistor and the emitter voltage of the above-mentioned first NPN transistor is not less than its conduction voltage, so the above-mentioned first NPN transistor is turned on and is in a conduction state. The above-mentioned first NPN transistor cooperates with the second switching device to further realize the effect that the protection module is turned off when a short-circuit abnormality occurs in the IGBT and is turned on when no short-circuit abnormality occurs in the IGBT, which can further prevent the above-mentioned IGBT from being broken down due to the short-circuit abnormality.

[0053] Of course, in addition to the structure of the first switching device shown in the above embodiment, the above-mentioned first switching device of the present application can also be other switching tube structures. In other embodiments, the above-mentioned first switching device may include: a third NPN transistor and a fourth NPN transistor, the collector of the third NPN transistor is electrically connected to the collector of the fourth NPN transistor, the emitter of the third NPN transistor is electrically connected to the base of the fourth NPN transistor, the base of the above-mentioned third NPN transistor is the control end of the above-mentioned first switching tube, the collector of the above-mentioned third NPN transistor is the first end of the above-mentioned first transistor, and the emitter of the above-mentioned fourth NPN transistor is the second end of the above-mentioned first transistor.

[0054] According to some other optional schemes of the present application, the above-mentioned second switching device includes: a second NPN transistor, the base of the above-mentioned second NPN transistor is electrically connected to the second end of the above-mentioned current limiting device, the collector of the above-mentioned second NPN transistor is electrically connected to the first end of the above-mentioned current limiting device, and the emitter of the above-mentioned second NPN transistor is the output end of the above-mentioned protection module.

[0055] In the above embodiment, when the above IGBT does not have a short circuit abnormality, by reasonably setting the resistance values ​​of the above first voltage divider device and the above current limiting device, the difference between the base voltage of the above second NPN transistor and the emitter voltage of the above second NPN transistor is not less than the conduction voltage of the above second NPN transistor, and the above second NPN transistor is in a conducting state. When the above IGBT has a short circuit abnormality, the difference between the base voltage of the above second NPN transistor and the emitter voltage of the second NPN transistor is less than its conduction voltage, so the above second NPN transistor cannot be turned on, and the current cannot flow to the IGBT. The above second NPN transistor cooperates with the first switch device to further realize the effect that the protection module is turned off when the IGBT has a short circuit abnormality and turned on when the IGBT does not have a short circuit abnormality, which can further prevent the above IGBT from being broken down due to the short circuit abnormality.

[0056] Of course, in addition to the structure of the second switching device shown in the above embodiment, the above-mentioned second switching device of the present application can also be other switching tube structures. In other embodiments, the above-mentioned second switching device may include: a fifth NPN transistor and a sixth NPN transistor, the collector of the fifth NPN transistor is electrically connected to the collector of the sixth NPN transistor, the emitter of the fifth NPN transistor is electrically connected to the base of the sixth NPN transistor, the base of the above-mentioned fifth NPN transistor is the control end of the above-mentioned second switching tube, the collector of the above-mentioned fifth NPN transistor is the first end of the above-mentioned second transistor, and the emitter of the above-mentioned sixth NPN transistor is the second end of the above-mentioned second transistor.

[0057] An embodiment of the present application further provides an air conditioner, comprising: an inverter, wherein the inverter comprises an IGBT and a protection device for the IGBT, and the protection device is any one of the above-mentioned IGBT protection devices.

[0058] Through the above embodiment, in the inverter of the air conditioner, the inverter is short-circuit protected by the protection device of the IGBT. In the IGBT protection device, the input end of the protection module is connected to the power supply, and the output end of the protection module is connected to the gate of the IGBT. When the IGBT has a short-circuit abnormality, the protection module is turned off, thereby disconnecting the electrical connection between the IGBT and the power supply. When the IGBT does not have a short-circuit abnormality, the protection module is turned on, which does not affect the electrical connection between the IGBT and the power supply. The protection module is turned off when the IGBT has a short-circuit abnormality, and turned on when the IGBT does not have a short-circuit abnormality, thereby achieving the effect of not interfering with the normal operation of the IGBT when the IGBT does not have a short-circuit abnormality, and cutting off the effective protection of the IGBT when the IGBT has a short-circuit abnormality, avoiding the problem that the IGBT is damaged by the short-circuit abnormality or even affects the circuit system in which it is located, thereby ensuring the high reliability of the air conditioner.

[0059] In other embodiments, Figure 2 As shown, the inverter further includes: a load 24 , through which the emitter of the IGBT 22 is grounded; and an external power source 26 , which is electrically connected to the collector of the IGBT 22 .

[0060] It should also be noted that the terms "include", "comprises" or any other variations thereof are intended to cover non-exclusive inclusion, so that a process, method, commodity or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, commodity or device. In the absence of more restrictions, the elements defined by the sentence "comprises a ..." do not exclude the existence of other identical elements in the process, method, commodity or device including the elements.

[0061] From the above description, it can be seen that the above embodiments of the present application achieve the following technical effects:

[0062] 1) In the IGBT protection device of the present application, the input end of the protection module is connected to the power supply, and the output end of the protection module is connected to the gate of the IGBT. When the IGBT has a short circuit abnormality, the protection module is turned off, thereby disconnecting the electrical connection between the IGBT and the power supply. When the IGBT has no short circuit abnormality, the protection module is turned on, which does not affect the electrical connection between the IGBT and the power supply, nor does it affect the normal operation of the IGBT. The protection module is turned off when the IGBT has a short circuit abnormality, and turned on when the IGBT has no short circuit abnormality, thereby achieving the effect of not interfering with the normal operation of the IGBT when the IGBT has no short circuit abnormality, and cutting off the effective protection of the IGBT when the IGBT has a short circuit abnormality, thereby avoiding the problem of the IGBT being damaged by the short circuit abnormality or even affecting the circuit system in which it is located.

[0063] 2) In the air conditioner of the present application, the inverter is short-circuited and protected by the IGBT protection device. In the IGBT protection device, the input end of the protection module is connected to the power supply, and the output end of the protection module is connected to the gate of the IGBT. When the IGBT has a short-circuit abnormality, the protection module is turned off, thereby disconnecting the electrical connection between the IGBT and the power supply. When the IGBT does not have a short-circuit abnormality, the protection module is turned on, which does not affect the electrical connection between the IGBT and the power supply. The protection module is turned off when the IGBT has a short-circuit abnormality, and turned on when the IGBT does not have a short-circuit abnormality, thereby achieving the effect of not interfering with the normal operation of the IGBT when the IGBT does not have a short-circuit abnormality, and cutting off the effective protection of the IGBT when the IGBT has a short-circuit abnormality, avoiding the problem of the IGBT itself being damaged by a short-circuit abnormality or even affecting the circuit system in which it is located, thereby ensuring the high reliability of the air conditioner.

[0064] The above description is only the preferred embodiment of the present application and is not intended to limit the present application. For those skilled in the art, the present application may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. An IGBT protection device, characterized in that: The protection device comprises: A protection module, wherein the input end of the protection module is used to be electrically connected to a power supply, the output end of the protection module is used to be electrically connected to the gate of the IGBT, the protection module is used to be turned off when a short circuit abnormality occurs in the IGBT, and turned on when no short circuit abnormality occurs in the IGBT, and the power supply is used to supply power to the IGBT. The protection module comprises: A first voltage divider device, wherein a first end of the first voltage divider device is an input end of the protection module; a current limiting device, wherein a first end of the current limiting device is electrically connected to a first end of the first voltage dividing device; A first switch device, comprising a control end, a first end, and a second end, wherein the control end of the first switch device is electrically connected to the second end of the first voltage divider device, the first end of the first switch device is electrically connected to the second end of the current limiting device, and the second end of the first switch device is an output end of the protection module; The second switch device includes a control end, a first end, and a second end. The control end of the second switch device is electrically connected to the second end of the current limiting device, the first end of the second switch device is electrically connected to the first end of the current limiting device, and the second end of the second switch device is the output end of the protection module.

2. The IGBT protection device according to claim 1, characterized in that: The protection module also includes: A second voltage divider device, wherein a first end of the second voltage divider device is electrically connected to a second end of the first voltage divider device, and a second end of the second voltage divider device is grounded.

3. The IGBT protection device according to claim 2, characterized in that: The resistance value of the first voltage divider device is greater than the resistance value of the second voltage divider device.

4. The IGBT protection device according to any one of claims 1 to 3, characterized in that: The first voltage dividing device and the current limiting device each include a resistor.

5. The IGBT protection device according to any one of claims 1 to 3, characterized in that: The first switch device includes at least one of the following: a MOS tube, a triode, and a thyristor.

6. The IGBT protection device according to any one of claims 1 to 3, characterized in that: The second switch device includes at least one of the following: a MOS tube, a triode, and a thyristor.

7. The IGBT protection device according to any one of claims 1 to 3, characterized in that: The first switching device comprises: A first NPN transistor, wherein the base of the first NPN transistor is electrically connected to the second end of the first voltage divider device, the collector of the first NPN transistor is electrically connected to the second end of the current limiting device, and the emitter of the first NPN transistor is the output end of the protection module.

8. The IGBT protection device according to any one of claims 1 to 3, characterized in that: The second switching device comprises: A second NPN transistor, wherein the base of the second NPN transistor is electrically connected to the second end of the current limiting device, the collector of the second NPN transistor is electrically connected to the first end of the current limiting device, and the emitter of the second NPN transistor is the output end of the protection module.

9. An air conditioner, characterized in that: include: An inverter, the inverter comprising an IGBT and a protection device for the IGBT, the protection device being the IGBT protection device according to any one of claims 1 to 8.

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