IPM short-circuit protection circuit, module and system for flywheel energy storage device

Abstract

The present invention relates to the technical field of IPM protection circuits, and specifically to an IPM short-circuit protection circuit, module and system for a flywheel energy storage device. Among them, the IPM short-circuit protection system is suitable for 1500V subway tracks and 200KW flywheel energy storage devices. The IPM short-circuit protection system includes: an IPM short-circuit protection module, a signal generating module, an IPM module and a line driving module. The IPM short-circuit protection module is respectively connected to the IPM module, the signal generating module and the line driving module. The line driving module is respectively connected to the IPM module and the signal generating module. The IPM short-circuit protection module collects the pulse signal output by the signal generating module and the gate-level voltage signal of the IGBT component in the IPM module and outputs a short-circuit protection signal. The line driving module controls whether the pulse signal is transmitted to the IPM module according to the short-circuit protection signal. In the above manner, short-circuit detection is performed on the IGBT component and the pulse signal at the same time. Compared with the use of an MCU controller, the device structure is simplified and the safety and accuracy of the system are improved.

Description

Technical Field

[0001] The present invention relates to the technical field of IPM protection circuits, and in particular to an IPM short-circuit protection circuit, module and system for a flywheel energy storage device. Background Art

[0002] IPM (Intelligent Power Module) is an advanced new power switching device, which has the advantages of high current density, low saturation voltage and high voltage resistance of GTR (high power transistor), and the advantages of high input impedance, high switching frequency and low driving power of MOSFET (field effect transistor). IPM integrates logic, control, detection and protection circuits, is easy to use and has a wide range of applications. It not only reduces the size and development time of the system, but also greatly enhances the reliability of the system. It adapts to the development direction of today's power devices, such as modularization, compounding and power integrated circuits (PIC), and has received more and more attention in the field of power electronics.

[0003] As an important part of the control system, IPM should pay special attention to the handling and protection of abnormal working status of IPM during use. However, the current protection circuit usually only detects the short circuit of IGBT components, and cannot block the pulse signal from continuing to transmit when there is an erroneous pulse signal input. At the same time, it is necessary to equip the main controller MCU to compare and analyze the sampled data to determine whether the circuit is short-circuited. If a short circuit occurs, the main controller MCU sends a blocking signal. This method requires a combination of software and hardware, which increases the difficulty and workload of development, and the price of MCU is higher than that of other electronic components, which increases the cost.

[0004] In view of this, overcoming the above defects in the prior art and providing a new IPM short-circuit protection circuit, module and system for a flywheel energy storage device has become a technical problem to be solved urgently in the art. Summary of the invention

[0005] The object of the present invention is to provide an IPM short-circuit protection circuit, module and system for a flywheel energy storage device in view of the above-mentioned defects in the prior art.

[0006] The purpose of the present invention can be achieved by the following technical measures:

[0007] An embodiment of the present invention provides an IPM short-circuit protection circuit for a flywheel energy storage device, wherein the IPM short-circuit protection circuit is connected to an IPM module and a signal generating module respectively, wherein the IPM module is provided with a first IGBT component and a second IGBT component, wherein the signal generating module is used to generate and output a first pulse signal and a second pulse signal, and wherein the IPM short-circuit protection circuit comprises: a signal input circuit module, a signal comparison circuit module and a signal output circuit module connected in sequence;

[0008] The signal input circuit module is connected to the IPM module and the signal generating module respectively, and the signal input circuit module collects the gate voltage signal of the first IGBT component, the gate voltage signal of the second IGBT component, the first pulse signal and the second pulse signal, and transmits them to the signal comparison circuit module;

[0009] The signal comparison circuit module includes a first AND gate logic gate chip, a second AND gate logic gate chip, a third AND gate logic gate chip and an OR gate logic gate chip, the input end of the OR gate logic gate chip is respectively connected to the output end of the first AND gate logic gate chip, the output end of the second AND gate logic gate chip and the output end of the third AND gate logic gate chip, the output end of the OR gate logic gate chip is connected to the signal output circuit module, the first AND gate logic gate chip outputs a first level signal according to the first pulse signal and the second pulse signal, the second AND gate logic gate chip outputs a second level signal according to the gate-level voltage signal of the first IGBT component, the third AND gate logic gate chip outputs a third level signal according to the gate-level voltage signal of the second IGBT component, the OR gate logic gate chip receives the first level signal, the second level signal and the third level signal and outputs a fourth level signal to the signal output circuit module;

[0010] The signal output circuit module outputs a short circuit protection signal according to the third level signal.

[0011] According to one embodiment of the present invention, the signal generating module includes a first generating end for generating and outputting a first pulse signal and a second generating end for generating and outputting a second pulse signal.

[0012] According to one embodiment of the present invention, the signal input circuit module includes a first resistor and a second resistor, the first resistor is respectively connected in series with the input end of the first AND gate logic gate chip and the first generating end, and the second resistor is respectively connected in series with the input end of the first AND gate logic gate chip and the second generating end.

[0013] According to one embodiment of the present invention, the gate-level voltage signal of the first IGBT component includes an upper gate-level voltage signal of the first IGBT component and a lower gate-level voltage signal of the first IGBT component, and two first voltage sensors are provided on the first IGBT component, and the two first voltage sensors are respectively used to collect the upper gate-level voltage signal of the first IGBT component and the lower gate-level voltage signal of the first IGBT component.

[0014] According to one embodiment of the present invention, the signal input circuit module includes a third resistor and a fourth resistor, the third resistor is respectively connected in series with the input end of the second AND gate logic gate chip and one of the first voltage sensors, and the fourth resistor is respectively connected in series with the input end of the second AND gate logic gate chip and another of the first voltage sensors.

[0015] According to one embodiment of the present invention, the gate-level voltage signal of the second IGBT component includes an upper gate-level voltage signal of the second IGBT component and a lower gate-level voltage signal of the second IGBT component, and two second voltage sensors are provided on the second IGBT component, and the two second voltage sensors are respectively used to collect the upper gate-level voltage signal of the second IGBT component and the lower gate-level voltage signal of the second IGBT component.

[0016] According to one embodiment of the present invention, the signal input circuit module includes a fifth resistor and a sixth resistor, the fifth resistor is respectively connected in series with the input end of the third AND gate logic gate chip and one of the second voltage sensors, and the sixth resistor is respectively connected in series with the input end of the third AND gate logic gate chip and another of the second voltage sensors.

[0017] According to an embodiment of the present invention, the signal output circuit module includes two NOT gate chips connected in series.

[0018] An embodiment of the present invention provides an IPM short-circuit protection module for a flywheel energy storage device. The IPM short-circuit protection module includes the IPM short-circuit protection circuit.

[0019] An embodiment of the present invention provides an IPM short-circuit protection system for a flywheel energy storage device, the IPM short-circuit protection system comprising: the IPM short-circuit protection module, the signal generating module, the IPM module and the line driving module, the input end of the IPM short-circuit protection module is respectively connected to the IPM module and the signal generating module, the output end of the IPM short-circuit protection module is connected to the line driving module, the line driving module is respectively connected to the IPM module and the signal generating module; when the short-circuit protection signal output by the IPM short-circuit protection module is in a low-level state, the line driving module controls the signal generating module to output a first pulse signal and a second pulse signal to pass through and transmit to the IPM module, and when the short-circuit protection signal output by the IPM short-circuit protection module is in a high-level state, the line driving module controls to block the first pulse signal and the second pulse signal output by the signal generating module from being transmitted to the IPM module.

[0020] According to one embodiment of the present invention, the line driving module includes a signal input pin, an enable pin and a signal output pin, the enable pin is connected to the IPM short-circuit protection module, the input pin is connected to the signal generating module, and the output pin is connected to the IPM module. When the short-circuit protection signal is in a low-level state, the first pulse signal and the second pulse signal are transmitted to the IPM module through the enable pin. When the short-circuit protection signal is in a high-level state, the enable pin blocks the first pulse signal and the second pulse signal from being transmitted to the IPM module.

[0021] The IPM short-circuit protection circuit, module and system for a flywheel energy storage device of the present invention are all composed of hardware. Compared with a system combining software and hardware, the safety and accuracy of the system are improved, and the efficiency of information processing is also significantly improved. Through the above method, on the basis of the original short-circuit detection of the IGBT component, a group of short-circuit detection of the input pulse signal is added. When an erroneous pulse signal is input, the pulse signal is blocked from continuing to be transmitted, so that it cannot be transmitted to the IPM module, thereby achieving the purpose of protecting the IGBT component. The line drive module acts as a switch, and by outputting the short-circuit protection signal to the line drive module, the first pulse signal and the second pulse signal are controlled to pass / block according to the level state of the short-circuit protection signal. Compared with the use of an MCU controller, the device structure is simplified, the peripheral circuits required by the MCU controller are reduced, and no software programming is required, thereby reducing the workload and development difficulty of system development. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a structural schematic diagram of an IPM short-circuit protection circuit for a flywheel energy storage device of the present invention.

[0023] Figure 2 It is a structural schematic diagram of an IPM short-circuit protection system for a flywheel energy storage device of the present invention. DETAILED DESCRIPTION

[0024] In order to make the purpose, technical solution and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and specific embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0025] Hereinafter, many aspects of the present invention will be better understood with reference to the accompanying drawings. The components in the accompanying drawings are not necessarily drawn to scale. Instead, emphasis is placed on clearly illustrating the components of the present invention. In addition, in several views of the accompanying drawings, the same reference numerals indicate corresponding parts.

[0026] As used herein, the words "exemplary" or "illustrative" mean used as an example, instance, or illustration. Any implementation described herein as "exemplary" or "illustrative" is not necessarily to be construed as preferred or advantageous over other implementations. All of the implementations described below are exemplary implementations, which are provided to enable those skilled in the art to make and use embodiments of the present disclosure and are not intended to limit the scope of the disclosure, which is defined by the claims. In other implementations, well-known features and methods are described in detail so as not to obscure the present invention. For the purposes of the description herein, the terms "upper," "lower," "left," "right," "front," "rear," "vertical," "horizontal," and their derivatives will be used interchangeably. Figure 1 The invention is directed to the invention of the present invention. Moreover, there is no intention to be bound by any express or implied theory given in the preceding technical field, background technology, summary of the invention or the detailed description below. It should also be understood that the specific devices and processes shown in the drawings and described in the following description are simple exemplary embodiments of the inventive concepts defined in the appended claims. Therefore, specific dimensions and other physical characteristics related to the embodiments disclosed herein should not be understood as limiting unless the claims explicitly state otherwise.

[0027] An embodiment of the present invention provides an IPM short-circuit protection circuit for a flywheel energy storage device. Figure 1 This is a schematic diagram of the IPM short-circuit protection circuit for flywheel energy storage devices. Figure 1 The IPM short-circuit protection circuit is connected to the IPM module 10 and the signal generating module 20 respectively. Furthermore, the IPM module 10 is provided with a first IGBT component (not shown in the figure) and a second IGBT component (not shown in the figure). The signal generating module 20 includes a first generating end 201 for generating and outputting a first pulse signal and a second generating end 202 for generating and outputting a second pulse signal. The IPM short-circuit protection circuit includes: a signal input circuit module 30, a signal comparison circuit module 40 and a signal output circuit module 50 connected in sequence.

[0028] In this embodiment, the signal input circuit module 30 is connected to the IPM module 10 and the signal generating module 20 respectively. The signal input circuit module 30 collects the gate-level voltage signal of the first IGBT component, the gate-level voltage signal of the second IGBT component, the first pulse signal and the second pulse signal and transmits them to the signal comparison circuit module 40.

[0029] Further, the first IGBT component includes an upper bridge arm and a lower bridge arm, and two first voltage sensors (not shown in the figure) are arranged on the first IGBT component. The gate-level voltage signal of the first IGBT component includes an upper gate-level voltage signal of the first IGBT component (i.e., the gate-level voltage signal of the upper bridge arm) and a lower gate-level voltage signal of the first IGBT component (i.e., the gate-level voltage signal of the lower bridge arm). The two first voltage sensors are respectively used to collect the upper gate-level voltage signal of the first IGBT component and the lower gate-level voltage signal of the first IGBT component. The second IGBT component includes an upper bridge arm and a lower bridge arm, and two second voltage sensors (not shown in the figure) are arranged on the second IGBT component. The gate-level voltage signal of the second IGBT component includes an upper gate-level voltage signal of the second IGBT component (i.e., the gate-level voltage signal of the upper bridge arm) and a lower gate-level voltage signal of the second IGBT component (i.e., the gate-level voltage signal of the lower bridge arm), and the two second voltage sensors are respectively used to collect the upper gate-level voltage signal of the second IGBT component and the lower gate-level voltage signal of the second IGBT component. In this embodiment, the first IGBT component and the second IGBT component can work separately or simultaneously.

[0030] In this embodiment, further, the signal comparison circuit module 40 includes a first AND gate logic gate chip 401, a second AND gate logic gate chip 402, a third AND gate logic gate chip 403 and an OR gate logic gate chip 404, the input end of the OR gate logic gate chip 404 is respectively connected to the output end of the first AND gate logic gate chip 401, the output end of the second AND gate logic gate chip 402, and the output end of the third AND gate logic gate chip 403, the output end of the OR gate logic gate chip 404 is connected to the signal output circuit module 50, the first AND gate logic gate chip 401 is grounded and connected to a reference voltage generator, the second AND gate logic gate chip 402 is grounded and connected to a reference voltage generator, the third AND gate logic gate chip 403 is grounded and connected to a reference voltage generator, and the OR gate logic gate chip 404 is grounded and connected to a reference voltage generator. The first AND gate logic chip 401 outputs a first level signal according to the first pulse signal and the second pulse signal. When the first pulse signal and the second pulse signal are both high level, the first level signal output by the first AND gate logic chip 401 is high level, otherwise, the first level signal output by the first AND gate logic chip 401 is low level. The second AND gate logic chip 402 outputs a second level signal according to the upper gate voltage signal of the first IGBT component and the lower gate voltage signal of the first IGBT component. When the upper gate voltage signal of the first IGBT component and the lower gate voltage signal of the first IGBT component are both high level, the second level signal output by the second AND gate logic chip 402 is high level, otherwise, the second level signal output by the second AND gate logic chip 402 is low level. The third AND gate logic chip 403 outputs a third level signal according to the upper gate voltage signal of the second IGBT component and the lower gate voltage signal of the second IGBT component. When the upper gate voltage signal of the second IGBT component and the lower gate voltage signal of the second IGBT component are both high level, the third level signal output by the third AND gate logic chip 403 is high level, otherwise, the third level signal output by the third AND gate logic chip 403 is low level. The OR gate logic chip 404 receives the first level signal, the second level signal and the third level signal and outputs a fourth level signal to the signal output circuit module 50. When only one level signal among the first level signal, the second level signal and the third level signal is high level, the fourth level signal output by the OR gate logic chip 404 is high level, otherwise, the fourth level signal output by the OR gate logic chip 404 is low level, and the signal output circuit module 50 outputs a short circuit protection signal according to the fourth level signal.

[0031] Further, the signal output circuit module 50 includes two NOT gate chips 501 connected in series. The NOT gate chip 501 is used to enhance the fourth level signal and stabilize the fourth level signal. When the fourth level signal is at a low level, the short-circuit protection signal output by the signal output circuit module 50 is the enhanced and stabilized fourth level signal, and the short-circuit protection signal is at a low level, indicating that the signal is normal; when the fourth level signal is at a high level, the short-circuit protection signal output by the signal output circuit module 50 is the enhanced and stabilized fourth level signal, and the short-circuit protection signal is at a high level, indicating that the signal is abnormal.

[0032] According to one embodiment of the present invention, see Figure 1 The signal input circuit module 30 includes a first resistor 301 and a second resistor 302. The first resistor 301 is connected in series with the input end of the first AND gate logic chip 401 and the first generating end 201, respectively. The second resistor 302 is connected in series with the input end of the first AND gate logic chip 401 and the second generating end 202, respectively.

[0033] According to one embodiment of the present invention, see Figure 1 The signal input circuit module 30 includes a third resistor 303 and a fourth resistor 304. The third resistor 303 is respectively connected in series with the input end of the second AND gate logic gate chip 402 and one of the first voltage sensors. The fourth resistor 304 is respectively connected in series with the input end of the second AND gate logic gate chip 402 and another first voltage sensor.

[0034] According to one embodiment of the present invention, see Figure 1 The signal input circuit module 30 includes a fifth resistor 305 and a sixth resistor 306. The fifth resistor 305 is respectively connected in series with the input end of the third AND gate logic gate chip 403 and one of the second voltage sensors. The sixth resistor 306 is respectively connected in series with the input end of the third AND gate logic gate chip 403 and another second voltage sensor.

[0035] An embodiment of the present invention provides an IPM short-circuit protection module for a flywheel energy storage device. The IPM short-circuit protection module includes the above-mentioned IPM short-circuit protection circuit. The IPM short-circuit protection circuit has been described in detail above and will not be repeated here.

[0036] An embodiment of the present invention provides an IPM short-circuit protection system for a flywheel energy storage device. The IPM short-circuit protection system is applicable to a 1500V subway track and a 200KW flywheel energy storage device. Figure 2 This is a schematic diagram of the IPM short-circuit protection system for flywheel energy storage devices. Figure 2The IPM short-circuit protection system includes: the above-mentioned IPM short-circuit protection module 1, the signal generating module 2, the IPM module 3 and the line driving module 4, the input end of the IPM short-circuit protection module 1 is respectively connected to the IPM module 3 and the signal generating module 2, the output end of the IPM short-circuit protection module 1 is connected to the line driving module 4, the line driving module 4 is respectively connected to the IPM module 3 and the signal generating module 2, the IPM short-circuit protection module 1 collects the first pulse signal and the second pulse signal output by the signal generating module 2 and the gate-level voltage signal of the first IGBT component and the gate-level voltage signal of the second IGBT component output by the IPM module 3 and outputs a short-circuit protection signal, when the short-circuit protection signal output by the IPM short-circuit protection module 1 is in a low-level state, the line driving module 4 controls the first pulse signal and the second pulse signal output by the signal generating module 2 to pass through and be transmitted to the IPM module 3, when the short-circuit protection signal output by the IPM short-circuit protection module 1 is in a high-level state, the line driving module 4 controls the first pulse signal and the second pulse signal output by the blocking signal generating module 2 to be transmitted to the IPM module 3.

[0037] Furthermore, the line driving module 4 includes a signal input pin, an enable pin and a signal output pin, the enable pin is connected to the IPM short-circuit protection module 1, the input pin is connected to the signal generating module 2, and the output pin is connected to the IPM module 3. When the short-circuit protection signal is in a low-level state, the first pulse signal and the second pulse signal are transmitted to the IPM module 3 through the enable pin. When the short-circuit protection signal is in a high-level state, the enable pin blocks the first pulse signal and the second pulse signal from being transmitted to the IPM module 3.

[0038] The IPM short-circuit protection circuit, module and system for a flywheel energy storage device of the present invention are all composed of hardware. Compared with a system combining software and hardware, the safety and accuracy of the system are improved, and the efficiency of information processing is also significantly improved. Through the above method, on the basis of the original short-circuit detection of the IGBT component, a group of short-circuit detection of the input pulse signal is added. When an erroneous pulse signal is input, the pulse signal is blocked from continuing to be transmitted, so that it cannot be transmitted to the IPM module, thereby achieving the purpose of protecting the IGBT component. The line drive module acts as a switch, and by outputting the short-circuit protection signal to the line drive module, the first pulse signal and the second pulse signal are controlled to pass / block according to the level state of the short-circuit protection signal. Compared with the use of an MCU controller, the device structure is simplified, the peripheral circuits required by the MCU controller are reduced, and no software programming is required, thereby reducing the workload and development difficulty of system development.

[0039] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. An IPM short-circuit protection circuit for a flywheel energy storage device, characterized in that: The IPM short-circuit protection circuit is connected to an IPM module and a signal generating module respectively. The IPM module is provided with a first IGBT component and a second IGBT component. The signal generating module is used to generate and output a first pulse signal and a second pulse signal. The IPM short-circuit protection circuit comprises: a signal input circuit module, a signal comparison circuit module and a signal output circuit module connected in sequence; The signal input circuit module is connected to the IPM module and the signal generating module respectively, and the signal input circuit module collects the gate voltage signal of the first IGBT component, the gate voltage signal of the second IGBT component, the first pulse signal and the second pulse signal and transmits them to the signal comparison circuit module; The signal comparison circuit module includes a first AND gate logic gate chip, a second AND gate logic gate chip, a third AND gate logic gate chip and an OR gate logic gate chip, the input end of the OR gate logic gate chip is respectively connected to the output end of the first AND gate logic gate chip, the output end of the second AND gate logic gate chip and the output end of the third AND gate logic gate chip, the output end of the OR gate logic gate chip is connected to the signal output circuit module, the first AND gate logic gate chip outputs a first level signal according to the first pulse signal and the second pulse signal, the second AND gate logic gate chip outputs a second level signal according to the gate voltage signal of the first IGBT component, the third AND gate logic gate chip outputs a third level signal according to the gate voltage signal of the second IGBT component, the OR gate logic gate chip receives the first level signal, the second level signal and the third level signal and outputs a fourth level signal to the signal output circuit module; The signal output circuit module outputs a short circuit protection signal according to the fourth level signal.

2. The IPM short circuit protection circuit according to claim 1, characterized in that: The signal generating module comprises a first generating end for generating and outputting a first pulse signal and a second generating end for generating and outputting a second pulse signal.

3. The IPM short circuit protection circuit according to claim 2, characterized in that: The signal input circuit module includes a first resistor and a second resistor, the first resistor is respectively connected in series with the input end of the first AND gate logic gate chip and the first generating end, and the second resistor is respectively connected in series with the input end of the first AND gate logic gate chip and the second generating end.

4. The IPM short circuit protection circuit according to claim 3, characterized in that: The gate voltage signal of the first IGBT component includes an upper gate voltage signal of the first IGBT component and a lower gate voltage signal of the first IGBT component. Two first voltage sensors are provided on the first IGBT component, and the two first voltage sensors are respectively used to collect the upper gate voltage signal of the first IGBT component and the lower gate voltage signal of the first IGBT component.

5. The IPM short circuit protection circuit according to claim 4, characterized in that: The signal input circuit module includes a third resistor and a fourth resistor, the third resistor is respectively connected in series with the input end of the second AND gate logic gate chip and one of the first voltage sensors, and the fourth resistor is respectively connected in series with the input end of the second AND gate logic gate chip and another of the first voltage sensors.

6. The IPM short circuit protection circuit according to claim 3 or 5, characterized in that: The gate voltage signal of the second IGBT component includes an upper gate voltage signal of the second IGBT component and a lower gate voltage signal of the second IGBT component. Two second voltage sensors are provided on the second IGBT component. The two second voltage sensors are respectively used to collect the upper gate voltage signal of the second IGBT component and the lower gate voltage signal of the second IGBT component.

7. The IPM short circuit protection circuit according to claim 6, characterized in that: The signal input circuit module includes a fifth resistor and a sixth resistor, the fifth resistor is respectively connected in series with the input end of the third AND gate logic gate chip and one of the second voltage sensors, and the sixth resistor is respectively connected in series with the input end of the third AND gate logic gate chip and another of the second voltage sensors.

8. The IPM short circuit protection circuit according to claim 1, characterized in that: The signal output circuit module comprises two NOT gate chips connected in series.

9. An IPM short-circuit protection module for a flywheel energy storage device, characterized in that: The IPM short-circuit protection module comprises the IPM short-circuit protection circuit according to any one of claims 1 to 8.

10. An IPM short-circuit protection system for a flywheel energy storage device, characterized in that: The IPM short-circuit protection system includes: the IPM short-circuit protection module, signal generating module, IPM module and line driving module as described in claim 9, the input end of the IPM short-circuit protection module is respectively connected to the IPM module and the signal generating module, the output end of the IPM short-circuit protection module is connected to the line driving module, and the line driving module is respectively connected to the IPM module and the signal generating module; when the short-circuit protection signal output by the IPM short-circuit protection module is in a low-level state, the line driving module controls the signal generating module to output a first pulse signal and a second pulse signal to pass and transmit to the IPM module, and when the short-circuit protection signal output by the IPM short-circuit protection module is in a high-level state, the line driving module controls the blocking of the first pulse signal and the second pulse signal output by the signal generating module from being transmitted to the IPM module.

11. The IPM short circuit protection system according to claim 10, characterized in that: The line driving module includes a signal input pin, an enable pin and a signal output pin, the enable pin is connected to the IPM short-circuit protection module, the input pin is connected to the signal generating module, and the output pin is connected to the IPM module. When the short-circuit protection signal is in a low-level state, the first pulse signal and the second pulse signal are transmitted to the IPM module through the enable pin. When the short-circuit protection signal is in a high-level state, the enable pin blocks the first pulse signal and the second pulse signal from being transmitted to the IPM module.

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