A power module dynamic performance testing device and system

Abstract

The application relates to the technical field of power module testing devices, and discloses a power module dynamic performance testing device, which comprises a base, the base is provided with a device groove, and is provided with: a conveying mechanism comprising: conveying belt device one and conveying belt device two which are fixedly installed in the inner wall of the device groove in sequence, and the top of each belt is on the same horizontal line as the top of the base; the conveying belt device one and the conveying belt device two are used for feeding and discharging the modules; and a baffle is fixedly installed on the top of the base. A central processing unit controls the driving module to control the displacement of the mover end of a linear motor one, the IGBT power module is placed on the belt of the conveying belt device one and is conveyed to the U arms, the linear motor one is started, the IGBT power module is driven into an ultrasonic scanner, scanning is carried out, scanning data is observed and recorded on a display screen, the module hardware is detected, and test evaluation is carried out on the packaging sealing performance.

Description

Technical Field

[0001] This invention relates to the field of power module testing equipment technology, specifically to a power module dynamic performance testing device and system. Background Technology

[0002] Power modules are hybrid integrated power components with IGBTs as their core, consisting of high-speed, low-power IGBTs, optimized gate drive circuits, and fast protection circuits. In recent years, the automotive industry has continuously developed power components and systems, and the number of IGBT devices used in electric vehicles has increased rapidly. Semiconductor and electric vehicle manufacturers alike desire high efficiency and low industrial process costs in the production of these IGBT-equipped products; therefore, meticulous control is essential from product development to final product quality control.

[0003] According to Chinese Patent "Dynamic Performance Testing Device for Power Modules" (publication number CN113495196A), this patent provides a dynamic performance testing device for power modules that can reduce parasitic inductance in the test circuit, whose test results can be directly used as the basis for actual power module selection, and which can handle tests at multiple voltage levels. The device comprises: a control unit that controls pulse parameters and test conditions; a pulse generator that outputs pulse signals based on the pulse parameters from the control unit; a testing unit that has a power module drive unit mounting part and a power module mounting part for mounting power modules, the power module drive unit mounting part being electrically connected to the power module mounting part; and multiple power module drive units of different specifications that are detachably mounted on the power module drive unit mounting part. The test unit comprises a power module drive unit, which drives the power module according to test conditions from the control unit and pulse signals from the pulse generator; a data acquisition unit, which is electrically connected to the power module mounting unit, acquires the dynamic performance data of the power module as test data when the power module drive unit drives the power module; a power supply, which supplies current to the power module when the power module drive unit drives the power module; and multiple busbars of different specifications, which are detachably mounted in the test unit and connect the power supply and the power module. One of the multiple busbars and one of the multiple power module drive units are installed in the test unit so that the power module can be tested under conditions that are the same as or similar to the actual use conditions of the power module.

[0004] This patent utilizes a single device to adjust multiple voltage levels and perform drive tests on power modules. However, the dynamic performance test of IGBT power modules is not limited to the test results under drive conditions. It also involves the sealing of the overall packaging structure and heat dissipation performance. When the packaging structure is worn or cracked, the module ages, and the heat dissipation performance does not meet the expected effect, it will still affect the dynamic performance of the power module. Therefore, testing of these aspects cannot be excluded. Thus, a dynamic performance testing device and system for power modules is proposed. Summary of the Invention

[0005] (a) Technical problems to be solved

[0006] To address the shortcomings of existing technologies, this invention provides a power module dynamic performance testing device and system.

[0007] (II) Technical Solution

[0008] To achieve the above objectives, the present invention provides the following technical solution: a power module dynamic performance testing device, comprising a base, wherein a device slot is formed on the base, and wherein:

[0009] Conveying mechanism, including:

[0010] Conveyor belt device one and conveyor belt device two are fixedly installed in sequence on the inner wall of the device groove, and the top of each belt is on the same horizontal line as the top of the base.

[0011] A baffle is fixedly installed on the top of the base and located on the right side of the back of the conveyor belt device.

[0012] Linear motor one is fixedly installed on the top of the base and is arranged perpendicularly to conveyor belt device one and conveyor belt device two;

[0013] The U-shaped arm is fixedly installed on the moving end of the linear motor and its bottom is in contact with the top of the base.

[0014] A push plate is slidably connected between the inner walls of the U-arm;

[0015] Electric actuators are sequentially and fixedly installed on the right side of the outer wall of the U-arm, with their inner rods movably penetrating through the inner wall of the U-arm and fixedly connected to the right side of the push plate.

[0016] Preferably, an ultrasonic scanner is fixedly installed on the top rear side of the base, and a side groove is provided on the right side of the inlet inner wall of the ultrasonic scanner. The rear end of the linear motor extends into the interior of the ultrasonic scanner through the side groove.

[0017] Preferably, a display screen is fixedly installed on the left side of the outer wall of the ultrasonic scanner.

[0018] Preferably, the base is provided with:

[0019] Testing organizations include:

[0020] Linear motor two is fixedly installed on the top of the base and located on the right side of the outer wall of the ultrasonic scanner;

[0021] The housing is fixedly connected to the mover end of the second linear motor on the left side, and has a rod groove on the right side;

[0022] Electric actuator 2, the outer wall of the outer rod is fixedly connected to the inner wall of the rod groove, and the inner rod extends to the right;

[0023] The U-groove is fixedly installed on the right end of the inner rod of the electric actuator two;

[0024] The discharge port is disposed between the inner walls of the U-groove and located on the front side of the inner wall of the U-groove;

[0025] The IGBT power module is disposed between the inner walls of the U-slot, and the pins of the IGBT power module move through the discharge port and extend forward.

[0026] Two screws, with their bottom ends rotatably connected to the top of the two lug ends of the U-groove via bearings;

[0027] The clamping arms are threaded onto the outer walls of the two screws at both ends.

[0028] Preferably, the base is further provided with:

[0029] Temperature control mechanism, including:

[0030] The L-shaped box has one end fixedly connected to the top rear side of the base and located on the right side of the ultrasonic scanner, and the other end of the L-shaped box has a heat dissipation vent.

[0031] A partition is fixedly installed inside the other end of the L-shaped box.

[0032] The heating plate is fixedly installed inside the L-shaped box and located on the left side of the partition.

[0033] The cooling element is fixedly installed inside the L-shaped box and located on the right side of the partition.

[0034] The bottom of the L-shaped box, away from the base, has an air outlet one and an air outlet two in sequence.

[0035] An exhaust fan is provided between the heating plate and the first air outlet, and an exhaust fan is provided between the cooling plate and the second air outlet.

[0036] Preferably, a control box is fixedly installed on the bottom front side of the base, and a groove is provided on the top of the control box. A control unit is provided inside the control box, and a multimeter is provided on the inner wall of the groove. A testing device is fixedly installed on the top right side of the base, and a power module is provided in the testing device.

[0037] Preferably, a radiator is fixedly installed at the bottom of the base, and heat dissipation holes are provided on both sides of the outer wall of the radiator.

[0038] A dynamic performance testing system for a power module is provided. A central processing unit is installed in the base. The signal terminal of the central processing unit is bidirectionally connected to the signal terminal of the control unit. The control unit is provided with a drive module and a temperature control module. The signal terminal of the control unit is bidirectionally connected to the signal terminals of the drive module, the temperature control module, and the power module, respectively.

[0039] (III) Beneficial Effects

[0040] Compared with the prior art, the present invention provides a power module dynamic performance testing device and system, which has the following beneficial effects:

[0041] 1. This power module dynamic performance testing device and system uses a central processing unit to control the displacement of the moving end of a linear motor, placing the IGBT power module onto the belt of a conveyor belt device and transporting it between U-arms. The linear motor is then started to drive the IGBT power module into an ultrasonic scanner. The scanning data is observed and recorded on a display screen to test the module hardware and evaluate its packaging and sealing performance.

[0042] 2. This dynamic performance testing device and system for power modules controls the displacement of the IGBT power module by controlling the mover end of a linear motor, moving the module to the right side of a conveyor belt device, and activating an electric push rod to push the push plate into the belt of the conveyor belt device and transport it back to its original position. This facilitates automatic loading and unloading of the module, providing convenience for operation.

[0043] 3. This power module dynamic performance testing device and system involves placing the IGBT power module in a U-groove, short-circuiting the pins through the discharge port, and rotating the screw to cause the clamping arm to descend and press down on the IGBT power module to maintain the stability of the module during the testing process.

[0044] 4. This power module dynamic performance testing device and system can adjust the temperature of the heating plate and the cooling chip separately through the temperature control module. The heating plate continuously heats up, causing the exhaust fan to blow heat from the air outlet to the IGBT power module for heat dissipation performance testing, and recording its dynamic performance at different temperatures. Attached Figure Description

[0045] The accompanying drawings are provided to further illustrate the invention and form part of the specification. They are used in conjunction with embodiments of the invention to explain the invention and do not constitute a limitation thereof. In the drawings:

[0046] Figure 1 This is a perspective view of the present invention;

[0047] Figure 2 This is a schematic diagram of the conveying mechanism of the present invention;

[0048] Figure 3 This is a schematic diagram of the structure of the ultrasonic scanner of the present invention;

[0049] Figure 4 This is a schematic diagram of the testing mechanism of the present invention;

[0050] Figure 5 This is a schematic diagram of the temperature-changing mechanism of the present invention;

[0051] Figure 6 This is a schematic diagram of the heat sink of the present invention.

[0052] In the diagram: 1. Base; 2. Conveying mechanism; 201. Conveyor belt device one; 202. Conveyor belt device two; 203. Baffle; 204. Linear motor one; 205. U-arm; 206. Push plate; 207. Electric push rod one; 3. Ultrasonic scanner; 4. Side groove; 5. Display screen; 6. Testing mechanism; 601. Linear motor two; 602. Box sleeve; 603. Electric push rod two; 604. U-groove; 605. Discharge port; 606. IGBT power module; 607. Screw; 608. Clamping arm; 7. Temperature changing mechanism; 701. L-shaped box; 702. Partition plate; 703. Heating plate; 704. Air outlet one; 705. Cooling element; 706. Air outlet two; 8. Control box; 9. Multimeter; 10. Testing device; 11. Radiator; 12. Heat dissipation hole. Detailed Implementation

[0053] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments.

[0054] Examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain the invention, and should not be construed as limiting the invention.

[0055] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0056] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0057] Example 1

[0058] like Figure 1 , 2As shown in Figures 3 and 6, this invention provides a dynamic performance testing device for power modules, including a base 1. A device slot is provided on the base 1, and a conveying mechanism 2 is provided, comprising: a first conveyor belt device 201 and a second conveyor belt device 202, which are sequentially fixedly installed on the inner wall of the device slot, with the top of each belt aligned with the top of the base 1. The first and second conveyor belt devices 201 and 202 are used to feed and unload modules. A baffle 203 is fixedly installed on the top of the base 1, located on the right side of the back of the first conveyor belt device 201, preventing the modules from shifting during transport. A linear motor 204 is fixedly installed on the top of the base 1, perpendicular to the first and second conveyor belt devices 201 and 202. A U-arm 205 is fixedly installed on the moving end of the linear motor 204, with its bottom contacting the top of the base 1. A push plate 206 is slidably connected to the U-arm 205. Between the inner walls, electric push rods 207 are sequentially fixedly installed on the right side of the outer wall of U-arm 205, and their inner rods are movable through the inner wall of U-arm 205 and fixedly connected to the right side of push plate 206. Electric push rods 207 push push plate 206, causing the module to return to the belt of conveyor belt device 202. An ultrasonic scanner 3 is fixedly installed on the top rear side of the base 1. A side groove 4 is opened on the right side of the inlet inner wall of ultrasonic scanner 3. The rear end of linear motor 204 extends into the interior of ultrasonic scanner 3 through side groove 4. The ultrasonic scanner 3 is used to scan the module hardware to detect delamination, cracks, air holes and adhesion conditions in different positions inside the chip assembly, and to inspect defects in the chip sealant. A display screen 5 is fixedly installed on the left side of the outer wall of ultrasonic scanner 3. A heat sink 11 is fixedly installed on the bottom of the base 1. Heat dissipation holes 12 are opened on both sides of the outer wall of heat sink 11 to prevent the central processing unit from overheating.

[0059] In this embodiment, the moving end of the linear motor 204 is controlled and displaced by the central processing unit control drive module to place the IGBT power module 606 onto the belt of the conveyor belt device 201 and transport it between the U arms 205. The linear motor 204 is then started to drive the IGBT power module 606 into the ultrasonic scanner 3. The scanning data is observed and recorded on the display screen 5 through the scanning operation to test the module hardware and evaluate the sealing performance.

[0060] Example 2

[0061] like Figure 1 , 4As shown, based on Embodiment 1, the present invention provides a technical solution: Preferably, the base 1 is provided with a testing mechanism 6 including: a linear motor 601 fixedly installed on the top of the base 1 and located on the right side of the outer wall of the ultrasonic scanner 3; a housing 602 fixedly connected to the moving end of the linear motor 601 on the left side, and having a rod groove on the right side; the housing 602 is used to connect the moving end of the linear motor 601 to the U-groove 604 and maintain structural stability; the outer wall of the outer rod of the electric push rod 603 is fixedly connected to the inner wall of the rod groove, and the inner rod extends to the right; the U-groove 604 is fixedly installed on the right end of the inner rod of the electric push rod 603; and a discharge port 605 is located between the inner walls of the U-groove 604 and on the front side of the inner wall of the U-groove 604. Before testing, the IGBT module is connected to the discharge port. A short-circuit discharge is performed through the discharge port 605. The IGBT power module 606 is disposed between the inner walls of the U-groove 604, and the pins of the IGBT power module 606 move through the discharge port 605 and extend forward. The bottom ends of the two screws 607 are rotatably connected to the top of the two lug ends of the U-groove 604 through bearings. The two ends of the clamping arms 608 are threaded onto the outer walls of the two screws 607. Rotating the screws 607 causes the clamping arms 608 to descend and press down on the module for clamping and fixing. A control box 8 is fixedly installed on the bottom front side of the base 1, and a groove is opened on the top of the control box 8. A control unit is installed inside the control box 8, and a multimeter 9 is installed on the inner wall of the groove. A testing device 10 is fixedly installed on the top right side of the base 1, and a power module is installed in the testing device 10.

[0062] In this embodiment, the IGBT power module 606 is placed in the U-groove 604, and the pins are short-circuited through the discharge port 605 to avoid affecting the accuracy of the detection. Then, the screw 607 is rotated to cause the clamping arm 608 to descend and press down on the IGBT power module 606 for clamping. The multimeter 9 is taken out from the inner wall of the groove to identify the three electrodes of the IGBT, the gate G, the collector C, and the emitter E.

[0063] Example 3

[0064] like Figure 1 , 3As shown in Figures 4 and 5, based on Embodiment 1, the present invention provides a technical solution: Preferably, the base 1 is further provided with a temperature-changing mechanism 7, including: one end of an L-shaped box 701 is fixedly connected to the top rear side of the base 1 and located to the right of the ultrasonic scanner 3, and the other end of the L-shaped box 701 has a heat dissipation vent at its top, through which the heat generated inside the L-shaped box 701 is discharged. A partition 702 is fixedly installed inside the other end of the L-shaped box 701, and a heating plate 703 is fixedly installed inside the L-shaped box 701 and located to the left of the partition 702. The heating plate 703 continuously heats up, recording the dynamic performance of the recording module at different temperatures. A cooling plate 705 is fixedly installed inside the L-shaped box 701. Inside the L-shaped box 701, located to the right of the partition 702, the cooling element 705 cools the module by blowing cold air onto it via exhaust fan 2. At the bottom of the L-shaped box 701, furthest from the base 1, are sequentially located air outlet 1 704 and air outlet 2 706. Exhaust fan 1 is positioned between the heating plate 703 and air outlet 1 704, and exhaust fan 2 is positioned between the cooling element 705 and air outlet 2 706. A central processing unit (CPU) is housed within the base 1, with its signal terminals bidirectionally connected to the control unit's signal terminals. The control unit contains a drive module and a temperature control module, and its signal terminals are bidirectionally connected to the signal terminals of the drive module, temperature control module, and power module, respectively.

[0065] In this embodiment, the temperature of the heating plate 703 and the cooling chip 705 can be adjusted by the temperature control module. The heating plate 703 continuously heats up, causing the exhaust fan to blow heat from the air outlet 704 to the IGBT power module 606 for heat dissipation performance testing, and recording its dynamic performance at different temperatures.

[0066] The working principle of this power module dynamic performance testing device and system will be explained in detail below.

[0067] like Figure 1-6As shown, during use, the central processing unit controls the three modules in the control unit. The drive module can control the displacement of the moving ends of linear motor 204 and linear motor 601 respectively. The temperature control module can adjust the temperature of heating plate 703 and cooling plate 705 respectively, and turn on the corresponding exhaust fan to discharge hot or cold air from exhaust port 704 or exhaust port 706. The power module adopts the technical solution of the comparative patent CN113495196A, and constructs a three-phase bridge power module in three half-bridge circuits to obtain a power module dynamic performance testing device with low parasitic inductance, test results that can be directly used as the basis for actual selection of power modules, and the ability to handle tests of multiple voltage levels. First, the dimensions of the packaged IGBT power module 606 are recorded on the base 1. Then, conveyor belt device 1 201 and conveyor belt device 202 are activated, moving them in opposite directions to transport the IGBT power module 606 onto the belt of conveyor belt device 1 201 to the U-arm 205. Then, linear motor 1 204 is started, causing its mover to drive the U-arm 205, thus moving the IGBT power module 606 into the ultrasonic scanner 3. The scanning data is observed and recorded on the display screen 5 to assess the damage to the IGBT power module 606's casing. After scanning, linear motor 1 204 moves the module to the right side of conveyor belt device 2 202, and the electric actuator is activated. Rod 207 causes its inner rod to push the push plate 206, which in turn pushes the module into the conveyor belt of conveyor device 202 to transport it back to its original position. The IGBT power module 606 is placed in the U-groove 604, and the pins are short-circuited through the discharge port 605 to avoid affecting the accuracy of the test. Then, the screw 607 is rotated to cause the clamping arm 608 to descend and press the IGBT power module 606 for clamping. The multimeter 9 is taken out from the inner wall of the groove to identify the three electrodes of the IGBT: gate G, collector C, and emitter E. During the voltage test, the electric push rod 603 is activated, causing its inner rod to push the U-groove 604 into the test device 10. Dynamic performance testing is performed through the three-phase bridge power module, and the test... Data is recorded, the electric actuator 603 is retracted, the linear motor 601 is started, and the U-slot 604 moves the IGBT power module 606 to the L-box 701. The heating plate 703 continuously heats up, and the exhaust fan blows heat from the air outlet 704 to the IGBT power module 606 for heat dissipation performance testing. Its dynamic performance at different temperatures is recorded. After the test is completed, the inner rod of the electric actuator 603 is extended to push the IGBT power module 606 under the cooling chip 705 for cooling. The heat sink is used to dissipate the heat generated by the heating plate 703 and the cooling chip 705. The heat sink 11 enhances the heat dissipation effect on the base 1 to prevent the central processing unit from overheating. All heat is discharged from the heat dissipation hole 12.

[0068] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising a reference structure" does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

Claims

1. A dynamic performance testing device for a power module, comprising a base (1), characterized in that: The base (1) has a device slot and is equipped with: Conveying mechanism (2), including: Conveyor belt device one (201) and conveyor belt device two (202) are fixedly installed on the inner wall of the device groove in sequence, and the top of each belt is on the same horizontal line as the top of the base (1). A baffle (203) is fixedly installed on the top of the base (1) and located on the right side of the back of the conveyor belt device (201); Linear motor one (204) is fixedly installed on the top of the base (1) and is arranged perpendicularly to the conveyor belt device one (201) and the conveyor belt device two (202); The U-arm (205) is fixedly installed on the moving end of the linear motor (204), and its bottom is in contact with the top of the base (1); The push plate (206) is slidably connected between the inner walls of the U-arm (205); Electric actuators (207) are sequentially fixedly installed on the right side of the outer wall of the U-arm (205), and their inner rods are movably inserted through the inner wall of the U-arm (205) and fixedly connected to the right side of the push plate (206); An ultrasonic scanner (3) is fixedly installed on the top rear side of the base (1). A side groove (4) is provided on the right side of the inlet inner wall of the ultrasonic scanner (3). The rear end of the linear motor (204) extends into the interior of the ultrasonic scanner (3) through the side groove (4). A display screen (5) is fixedly installed on the left side of the outer wall of the ultrasonic scanner (3); The base (1) is provided with: Testing organizations (6) include: Linear motor 2 (601) is fixedly installed on the top of the base (1) and located on the right side of the outer wall of the ultrasonic scanner (3); The housing (602) is fixedly connected to the moving end of the linear motor (601) on the left side, and has a rod groove on the right side; Electric actuator 2 (603), the outer wall of the outer rod is fixedly connected to the inner wall of the rod groove, and the inner rod extends to the right; The U-groove (604) is fixedly installed on the right end of the inner rod of the electric actuator (603); The discharge port (605) is disposed between the inner walls of the U-groove (604) and located on the front side of the inner wall of the U-groove (604); An IGBT power module (606) is disposed between the inner walls of the U-slot (604), and the pins of the IGBT power module (606) move through the discharge port (605) and extend forward; Two screws (607) are rotatably connected at their bottom ends to the top of the two lugs of the U-groove (604) via bearings; The clamping arm (608) is threaded at both ends onto the outer walls of the two screws (607).

2. The power module dynamic performance testing device according to claim 1, characterized in that: The base (1) is also provided with: Temperature-changing mechanism (7), including: The L box (701) has one end of its bottom fixedly connected to the top rear side of the base (1) and located on the right side of the ultrasonic scanner (3), and the other end of the L box (701) has a heat dissipation vent. A partition (702) is fixedly installed inside the other end of the L-shaped box (701); The heating plate (703) is fixedly installed inside the L box (701) and located on the left side of the partition (702); The cooling element (705) is fixedly installed inside the L box (701) and located on the right side of the partition (702); The bottom of the L box (701) away from the base (1) is provided with an air outlet 1 (704) and an air outlet 2 (706) in sequence. An exhaust fan is provided between the heating plate (703) and the first air outlet (704), and an exhaust fan is provided between the cooling plate (705) and the second air outlet (706).

3. The power module dynamic performance testing device according to claim 1, characterized in that: A control box (8) is fixedly installed on the bottom front side of the base (1), and a groove is provided on the top of the control box (8). A control unit is provided inside the control box (8), and a multimeter (9) is provided on the inner wall of the groove. A test device (10) is fixedly installed on the top right side of the base (1), and a power module is provided in the test device (10).

4. The power module dynamic performance testing device according to claim 1, characterized in that: A radiator (11) is fixedly installed at the bottom of the base (1), and heat dissipation holes (12) are provided on both sides of the outer wall of the radiator (11).

5. The power module dynamic performance testing system according to claim 2, characterized in that: The base (1) is equipped with a central processing unit. The signal terminal of the central processing unit is bidirectionally connected to the signal terminal of the control unit. The control unit is equipped with a drive module and a temperature control module. The signal terminal of the control unit is bidirectionally connected to the signal terminals of the drive module, the temperature control module, and the power module, respectively.

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