A device and method for testing the AC current carrying capacity of a power electronic rectifier module

Abstract

The application provides a power electronic rectifier module AC current flow capacity testing device and testing method to solve the problem of lacking AC current flow performance testing of the rectifier module in the existing rectifier module testing device, wherein the testing device comprises a three-phase voltage regulator, a transformer, a temperature detection structure, a current detection structure, an adjustable load, a control structure, a timer and a counter; the three-phase voltage regulator is connected with an external power supply, and the three-phase voltage regulator is also connected with the primary sides of three transformers respectively; the secondary sides of the three transformers are connected with the three-phase input of the first rectifier module to be tested respectively; the output of the first rectifier module is connected with the adjustable load, and the adjustable load is also connected with the current detection structure; the temperature detection structure is arranged close to the three-phase voltage regulator; the current detection structure and the temperature detection structure are connected with the control structure respectively; the timer and the counter are also connected with the control structure respectively; and the AC side current flow capacity testing of the rectifier module is realized.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of rectifier module testing, in particular to a power electronic rectifier module AC current-carrying capacity testing device and testing method. BACKGROUND

[0002] The rectifier module is an electronic component for converting alternating current into direct current, which is composed of multiple diode chips according to different circuits through various packaging processes and is widely used in AC-to-DC applications. In order to verify whether the rectifier module meets the design requirements, various capacity tests must be performed, such as the content disclosed in the patent with the authorization announcement number CN104865513B, which can be used to test the surge resistance of the rectifier module, and the rectifier module also has current-carrying capacity testing, etc.

[0003] Currently, the traditional current-carrying capacity test in the industry often uses a direct current constant current for testing, and the specific method is to connect the positive electrode of the constant current source to the negative electrode of the output end of the rectifier module to flow in the current, and the positive electrode of the output end of the rectifier module flows out the current back to the negative electrode of the constant current source. In the existing testing method, the AC input pole of the rectifier module is suspended and not tested, so whether the AC pole of the rectifier module has defects cannot be effectively verified. In order to overcome the defects of the existing testing method, a power electronic rectifier module AC current-carrying capacity testing device and testing method are proposed. SUMMARY

[0004] The purpose of the present application is to overcome the deficiencies of the prior art and provide a power electronic rectifier module AC current-carrying capacity testing device and testing method.

[0005] In order to solve the above problems, the present application adopts the following technical solutions:

[0006] A power electronic rectifier module AC current-carrying capacity testing device, comprising a three-phase voltage regulator, a transformer, a temperature detection structure, a current detection structure, an adjustable load, a control structure, a timer and a counter; wherein the three-phase voltage regulator is connected with an external power supply, and the three-phase voltage regulator is also connected with the primary side of three transformers respectively; the secondary sides of the three transformers are connected with the three-phase input of a first rectifier module to be tested respectively, and the three transformers adopt Y-type connection; the output of the first rectifier module is connected with the adjustable load, and the adjustable load is also connected with the current detection structure to collect the current size passing through the adjustable load; the temperature detection structure is arranged close to the three-phase voltage regulator and is used for detecting the temperature of the three-phase voltage regulator; the current detection structure and the temperature detection structure are connected with the control structure respectively; the timer and the counter are also connected with the control structure respectively, the timer is used for counting the duration of the test, and the counter is used for counting the number of cycle tests.

[0007] Further, the three-phase contactor is arranged between the three-phase voltage regulator and the transformer, and a control end of the three-phase contactor is also connected with the adjustable load, and the adjustable load controls the on and off of the relay according to the temperature feedback of the temperature detection structure.

[0008] Further, the air switch is arranged in series between the external power supply and each input of the three-phase voltage regulator, and the air switch is also arranged between the output end of the three-phase voltage regulator and each input of the first rectifier module.

[0009] Further, the rotating voltage regulating part of the three-phase voltage regulator is provided with a fixed motor, an output shaft of the motor is in transmission connection with the rotating voltage regulating part of the three-phase voltage regulator, and the motor controls the voltage output by the three-phase voltage regulator; and the motor is also connected with the control structure.

[0010] Further, the adjustable load includes two parallel copper rods, a plurality of mounting through holes for arranging resistance wires are arranged on the two copper rods respectively, and screws for fixing the resistance wires in the mounting through holes are also arranged on the copper rods; and the total resistance value of the load is controlled by changing the number of the resistance wires arranged between the two copper rods.

[0011] Further, the output end of the first rectifier module to be detected is also provided with a second rectifier module for detecting the current passing capacity, and the direct current output end of the second rectifier module is connected with the adjustable load in series and then connected with the output of the first rectifier module.

[0012] Further, the support frame is arranged in a three-layer structure, the first layer is provided with the transformer and the three-phase voltage regulator, the second layer is provided with the adjustable load, and the third layer is provided with the rectifier module; and a mounting plate is arranged between the second layer and the third layer, and the control structure, the timer and the counter are fixedly arranged on the mounting plate.

[0013] Further, the heat dissipation structure includes a plurality of fans, and the fans are arranged on the third layer and the second layer of the support frame respectively.

[0014] A power electronic rectifier module AC current passing capacity test method based on the test device, including the following steps:

[0015] Step 1: The control structure sets the temperature change range, the current change range, the cycle number and the running time according to the input parameters;

[0016] Step 2: The control structure connects the three-phase voltage regulator and the transformer according to the start running instruction, and supplies power to the first rectifier module on the secondary side of the transformer;

[0017] Step 3: The current detection structure detects the current output by the first rectifier module to the adjustable load, judges whether the current exceeds the set current variation range, and controls the motor connected with the three-phase voltage regulator by the control structure to adjust the output voltage size, so that the current of the adjustable load is controlled within the current variation range.

[0018] Step 4: The temperature detection structure detects whether the temperature of the first rectifier module exceeds the temperature variation range; if the temperature exceeds the temperature variation range, the control structure controls the three-phase contactor to be disconnected, disconnects the connection between the three-phase voltage regulator and the transformer, controls the heat dissipation structure to start, reduces the temperature of the first rectifier module, and records the number of cycles as one cycle by the counter until the temperature reaches the set lower limit of the temperature, and enters the next step; otherwise, return to step 3 to maintain the detection of temperature variation and current variation.

[0019] Step 5: The control structure judges whether the actual number of cycles reaches the set number of cycles and whether the actual running time reaches the set running time according to the recorded values of the counter and the timer; if one of the conditions is met, the test is ended; otherwise, return to step 2 to continue the test.

[0020] Further, the voltage range of the secondary side output of the transformer is 3V~10V, and the resistance value of the adjustable load is 1 milliohm~20 milliohm; the current variation range set in step 1 is 300A~330A.

[0021] The beneficial effects of the present application are:

[0022] By setting the transformer secondary side connected with the three-phase input end of the rectifier module, cooperating with the adjustable load and other components, the through-flow capacity test of the alternating current side of the rectifier module is realized, and the performance of the rectifier module in all aspects is more comprehensively evaluated.

[0023] Cooperating with the temperature detection structure and the three-phase contactor, the cycle test of the rectifier module is realized, the performance of the rectifier module is tested multiple times under the condition of ensuring the safety of the test process, and the safety and reliability of the rectifier module passing the test are ensured.

[0024] By setting the motor connected with the three-phase voltage regulator, the output voltage of the three-phase voltage regulator is adjusted according to the current feedback, and the current between the two ends of the adjustable load is controlled within the set range.

[0025] By setting the adjustable load including the copper bar with mounting holes and cooperating with the resistance wire, the equivalent resistance value of the adjustable load reaches the milliohm level, the effect of low voltage and large current is realized, and the power output load capacity of the rectifier module is fully tested.

[0026] By setting the second rectifier module, the through-flow performance test of the output end of the other rectifier module is realized, and the types of simultaneous test are enriched.

[0027] By setting the heat dissipation structure, the rectifier module is rapidly cooled, and the efficiency of the cycle test is improved.

[0028] By using the test method, the performance stability of the rectifier module after multiple AC-DC cycle outputs is tested. BRIEF DESCRIPTION OF DRAWINGS

[0029] Figure 1 It is a schematic diagram of the overall structure of the device of Example 1.

[0030] Figure 2 It is a schematic diagram of the overall structure of the device of Example 1 from another angle.

[0031] Figure 3 It is an exploded view of the partial structure of the device of Example 1.

[0032] Figure 4 It is a schematic diagram of the adjustable resistor of Example 1.

[0033] Figure 5 It is a schematic diagram of the circuit structure of the device of Example 1.

[0034] Brief description of the drawings: three-phase voltage regulator 1, transformer 2, temperature detection structure 3, current detection structure 4, adjustable load 5, copper bar 51, resistance wire 52, screw 53, control structure 6, timer 7, counter 8, three-phase contactor 9, air switch 10, motor 11, first rectifier module 12, second rectifier module 13, support frame 14, mounting plate 141, heat dissipation structure 15, fan 151, heat dissipation base 152. DETAILED DESCRIPTION

[0035] The embodiments of the present application will be described in detail below with specific reference to specific examples. Those skilled in the art can easily understand other advantages and effects of the present application from the disclosure in this specification. The present application can also be implemented or applied in different specific embodiments, and the details in this specification can be modified or changed in various ways without departing from the spirit of the present application. It should be noted that the following examples and features in the examples can be combined with each other without conflict.

[0036] It should be noted that the diagrams provided in the following examples only illustrate the basic concept of the present application in a schematic manner, and only show the components related to the present application in the diagrams, not the number, shape and size of the components when actually implemented. The actual implementation of each component may be a random change in shape, number and proportion, and the layout pattern of the components may be more complex.

[0037] Example 1:

[0038] As Figures 1-5As shown, the alternating current flow capacity testing device of the power electronic rectifier module includes a three-phase voltage regulator 1, a transformer 2, a temperature detection structure 3, a current detection structure 4, an adjustable load 5, a control structure 6, a timer 7 and a counter 8. The three-phase voltage regulator 1 is connected with an external power supply, and the three-phase voltage regulator 1 is also connected with the primary side of the three transformers 2 respectively. The secondary side of the three transformers 2 is connected with the three-phase input of the first rectifier module 12 to be tested respectively, and the three transformers 2 adopt Y-type connection. Specifically, the N ends of the three transformers 2 are short-circuited, and each of the other three transformers 2 has a low-voltage output end connected to the alternating current input end of the rectifier module. The output of the first rectifier module 12 is connected with the adjustable load 5, and the adjustable load 5 is also connected with the current detection structure 4 to collect the current size passing through the adjustable load 5. The temperature detection structure 3 is arranged close to the three-phase voltage regulator 1 to detect the temperature of the three-phase voltage regulator 1. The current detection structure 4 and the temperature detection structure 3 are connected with the control structure 6 respectively. The timer 7 and the counter 8 are also connected with the control structure 6 respectively. The timer 7 is used to count the duration of the test, and the counter 8 is used to count the number of cycle tests, so as to control the stop of the test according to the duration of the test and the number of cycle tests. In this example, the output of the three-phase voltage regulator 1 is also connected with the control structure 6 to realize the power supply of the control structure 6. In addition, in this example, the temperature detection structure 3 and the control structure 6 are combined as a temperature controller.

[0039] The three-phase contactor 9 is also included, which is arranged between the three-phase voltage regulator 1 and the transformer 2. The control end of the three-phase contactor 9 is also connected with the adjustable load 5, and the adjustable load 5 controls the conduction and turn-off of the relay according to the temperature feedback of the temperature detection structure 3. It should be noted that the three-phase contactor 9 can also control the three-phase voltage regulator 1 and the transformer 2 to be disconnected at the end of the test, which cooperates with the control structure 6 to realize the control of whether the transformer 2 has input according to the temperature and other parameters, and further controls whether the rectifier module works or not.

[0040] The air switch 10 is also included, which is arranged in series between the external power supply and each phase input of the three-phase voltage regulator 1. The air switch 10 is also arranged between the output end of the three-phase voltage regulator 1 and each phase input of the first rectifier module 12. The air switch 10 at the two positions is used to control the start and stop of the three-phase voltage regulator 1, and the start and stop of the transformer 2, to realize power-off and protect the circuit components when there is an abnormal condition in the circuit. It should be noted that in this example, a relay is also included, which is connected in series in the circuit to control the on-off of the circuit.

[0041] The rotating voltage regulating part of the three-phase voltage regulator 1 is provided with a fixed motor 11, the output shaft of the motor 11 is in transmission connection with the rotating voltage regulating part of the three-phase voltage regulator 1, and controls the voltage output by the three-phase voltage regulator 1; the motor 11 is also connected with the control structure 6, and it needs to be noted that the control structure controls the forward and reverse rotation of the motor 11 according to the current change by using the existing mode; in this case, the motor 11 adjusts the output of the three-phase voltage regulator according to the current size detected by the current detection structure 4, and then controls the current passing through the adjustable load 5 to be stable within a certain range.

[0042] The voltage regulator adopts the specification of 220V:5V, so that the output voltage of the transformer for testing is low, and the safety of personnel operation is improved.

[0043] The adjustable load 5 includes two copper bars 51 arranged in parallel, a plurality of mounting through holes for arranging resistance wires 52 are arranged on the two copper bars 51 respectively, and screws 53 for fixing the resistance wires 52 in the mounting through holes are also arranged on the copper bars 51; the number of the resistance wires 52 arranged in parallel between the two copper bars 51 is changed to control the change of the equivalent total resistance value of the load; in this case, the two ends of the copper bar 51 are fixedly installed on the support frame structure described below through the insulating fixing seat. It needs to be noted that the resistance value of the adjustable load 5 is extremely small, in the order of milliohm, and the conventional high-power resistance wire 52 is difficult to reach the order of milliohm, so a plurality of resistance wires 52 in parallel are needed to reduce the equivalent resistance value of the adjustable load 5, so that a larger current can be obtained when the voltage is low, thereby ensuring the output power of the first rectifier module 12 and achieving the purpose of testing the output power performance. Because the current of the rectifier module is usually large in the application scene, and the slope resistance of the rectifier module itself is extremely small, in the order of milliohm, therefore, when testing the current capacity, if the load end of the rectifier module is directly connected in short circuit, although the heat can be reduced to a certain extent, the influence of the voltage fluctuation of the external power supply is large, which affects the test effect, so the adjustable resistance with small resistance value is added, so that the voltage drop between the two ends of the rectifier module and the voltage drop between the two ends of the adjustable load 5 are in the same order, which is about 1.5V in this case, and the influence caused by the voltage fluctuation of the power supply is reduced. In addition, two groups of adjustable loads 5 are arranged in series in this case, and the resistance value of one group of adjustable loads 5 is about 5 milliohm, so when the output voltage of the rectifier module is about 5V, the current value after passing through the two series adjustable loads 5 is about 300A.

[0044] The output end of the measured first rectifier module 12 is also provided with a second rectifier module 13 for detecting the current carrying capacity, the DC output end of the second rectifier module 13 is connected with the adjustable load 5 in series and then connected with the output of the first rectifier module 12; in this example, two second rectifier modules 13 are connected in series, one positive and negative pole of the DC output end of the two second rectifier modules 13 is connected, and the other positive and negative pole is connected with the output of the first rectifier module 12 to form a loop, so as to realize the purpose of testing the current carrying capacity of the second rectifier module 13 at the same time, improve the test efficiency, and enrich the performance test categories of the rectifier module in different aspects.

[0045] The support frame 14 is also provided with a three-layer structure, wherein the first layer is provided with the transformer 2 and the three-phase voltage regulator 1; the second layer is provided with the adjustable load 5; the third layer is provided with the rectifier module; the mounting plate 141 is also provided between the second layer and the third layer; the control structure 6, the timer 7 and the counter 8 are fixedly arranged on the mounting plate 141, and the cycle test times and the test time length are displayed by the counter 8 and the timer 7 respectively; the transformer 2 located in the first layer is connected with the rectifier module located in the third layer through the copper bar, and the adjustable load 5 located in the second layer is also connected with the rectifier module located in the third layer through the copper bar. The grounding wire is also provided on the first layer of the support frame 14, and the grounding wire is connected with the grounding end of the electronic components.

[0046] In addition, the current display part of the current detection structure 4 is also arranged on the mounting plate 141; the current detection structure 4 also includes a current sensor, the current sensor is connected with the adjustable load 5 in series, and the current sensor is also connected with the control structure 6 and the current display part, so as to transmit the detected current value to the current display part for display, and transmit the detected current value to the control structure 6, so as to control the action of the motor 11 on the three-phase voltage regulator 1 by the control structure 6.

[0047] The power switch and the current adjusting button associated with the motor 11 on the three-phase voltage regulator 1 are also arranged on the mounting plate 141. The universal wheels are also arranged at the bottom of the support frame 14 for convenient movement.

[0048] The heat dissipation structure 15 includes several fans 151, the fans 151 are respectively arranged on the third layer and the second layer of the support frame 14, and the fans 151 are connected with the control structure 6 and controlled by the control structure 6 to start and stop. In this example, two fans 151 are arranged on the third layer, and the two fans 151 are arranged on the two sides of the first rectifier module 12 and the second rectifier module 13 respectively to form an air flow channel in one direction. The heat dissipation structure 15 further includes a heat dissipation base 152, the heat dissipation base 152 includes a heat dissipation plate and several parallel heat dissipation fins, the heat dissipation fins are vertically arranged below the heat dissipation plate, and the other side of the heat dissipation plate is provided with the first rectifier module 12 and the second rectifier module 13 which can be detachably connected. The heat dissipation fins in the heat dissipation base 152 are parallel to the air flow channel between the two fans 151, so that the air flow passes through the gaps between the heat dissipation fins to take away heat.

[0049] A power electronic rectifier module AC current flow capability test method based on the above test device, comprising the following steps:

[0050] Step 1: The control structure 6 sets the temperature variation range, the current variation range, the cycle number and the running time according to the input parameters;

[0051] Step 2: The control structure 6 connects the three-phase voltage regulator 1 and the transformer 2 according to the start operation instruction to supply power to the first rectifier module 12 on the secondary side of the transformer 2;

[0052] Step 3: The current detection structure 4 detects the current output by the first rectifier module 12 to the adjustable load 5, judges whether the current exceeds the set current variation range, and controls the motor 11 connected with the three-phase voltage regulator 1 by the control structure 6 to adjust the output voltage size, so that the current of the adjustable load 5 is controlled within the current variation range;

[0053] Step 4: The temperature detection structure 3 detects whether the temperature of the first rectifier module 12 exceeds the temperature variation range; if the temperature exceeds the temperature variation range, the control structure 6 controls the three-phase contactor 9 to disconnect, disconnects the connection between the three-phase voltage regulator 1 and the transformer 2, controls the heat dissipation structure 15 to start, reduces the temperature of the first rectifier module 12, and records the number of cycles by the counter 8 until the temperature reaches the set lower limit, and enters the next step; otherwise, return to step 3 to maintain the detection of temperature variation and current variation;

[0054] Step 5: The control structure 6 judges whether the actual cycle number reaches the set cycle number and whether the actual running time reaches the set running time according to the recorded values of the counter 8 and the timer 7; if one of the conditions is met, the test is ended; otherwise, return to step 2 to continue the test.

[0055] The voltage range of the transformer 2 secondary side output is 3V-10V, the resistance value of the adjustable load 5 is 1mΩ-20mΩ, by adjusting the resistance value of the adjustable resistor and the output of the three-phase voltage regulator, the current change range set in step 1 is controlled to be 300A-330A.

[0056] In the implementation process, by setting the transformer 2 secondary side connected with the three-phase input end of the rectifier module, cooperating with the components such as the adjustable load 5, the through-flow capacity test of the AC side of the rectifier module is realized; cooperating with the temperature detection structure 3 and the three-phase contactor 9, the cycle test of the rectifier module is realized, the performance of the rectifier module is tested multiple times under the condition of ensuring the safety of the test process, and the safety and reliability of the detected rectifier module are ensured; by setting the motor 11 connected with the three-phase voltage regulator 1, the output voltage of the three-phase voltage regulator 1 is adjusted according to the current feedback, and the current between the two ends of the adjustable load 5 is controlled within the set range; by setting the adjustable load 5 including the copper bar 51 with a mounting hole, cooperating with the resistance wire 52, the equivalent resistance value of the adjustable load 5 is controlled to reach the milliohm level, the effect of low-voltage large-current is realized, and the power output load capacity of the rectifier module is fully tested; by setting the second rectifier module 13, the through-flow performance test of the output end of other rectifier modules is realized, and the types of simultaneous test are enriched; by setting the heat dissipation structure 15, the rapid cooling of the rectifier module is realized, and the efficiency of the cycle test is improved; by using the test method, the performance stability of the rectifier module after multiple AC-DC cycle outputs is tested.

[0057] Embodiment 2:

[0058] This embodiment is obtained by improving embodiment 1, and the difference between this embodiment and embodiment 1 is that the first rectifier module 12 and the second rectifier module 13 are both single-phase rectifier bridges, at this time the output of any transformer 2 is connected with the input end of the single-phase first rectifier module 12, and the connection mode of the output end of the first rectifier module 12 is the same as that of embodiment 1.

[0059] The above description is only one specific example of the present application and does not constitute any limitation on the present application. Obviously, for those skilled in the art, after understanding the content and principles of the present application, various modifications and changes in form and details can be made without departing from the principles and structures of the present application, but these modifications and changes based on the idea of the present application are still within the protection scope of the claims of the present application.

Claims

1. A device for testing the AC current carrying capacity of a power electronic rectifier module, characterized in that: The invention comprises a three-phase voltage regulator (1), a transformer (2), a temperature detection structure (3), a current detection structure (4), an adjustable load (5), a control structure (6), a timer (7) and a counter (8); wherein the three-phase voltage regulator (1) is connected to an external power supply, and the three-phase voltage regulator (1) is also connected to the primary sides of three transformers (2) respectively; the secondary sides of the three transformers (2) are respectively connected to the three-phase input of the first rectifier module (12) to be measured, and the three transformers (2) are connected in a Y-type manner; the input of the first rectifier module (12) is connected to the secondary sides of the three transformers (2) respectively. The output is connected to the adjustable load (5), and the adjustable load (5) is also connected to the current detection structure (4) to collect the current passing through the adjustable load (5); the temperature detection structure (3) is set close to the three-phase voltage regulator (1) and is used to detect the temperature of the three-phase voltage regulator (1); the current detection structure (4) and the temperature detection structure (3) are respectively connected to the control structure (6); the timer (7) and the counter (8) are also respectively connected to the control structure (6), the timer (7) is used to count the test time, and the counter (8) is used to count the number of cycle tests; It also includes a three-phase contactor (9), which is arranged between the three-phase voltage regulator (1) and the transformer (2), and the control end of the three-phase contactor (9) is also connected to the adjustable load (5).

2. The device for testing AC current carrying capacity of a power electronic rectifier module according to claim 1, characterized in that: The invention also includes a three-phase contactor (9), which is arranged between the three-phase voltage regulator (1) and the first rectifier module (12). The control end of the three-phase contactor (9) is also connected to the adjustable load (5), and the adjustable load (5) controls the on and off of the relay according to the temperature feedback of the temperature detection structure (3).

3. The device for testing the AC current carrying capacity of a power electronic rectifier module according to claim 2, characterized in that: It also includes an air switch (10), wherein the air switch (10) is arranged in series between each phase input of the three-phase voltage regulator (1) from which external power is supplied, and the air switch (10) is also arranged between the output end of the three-phase voltage regulator (1) and each phase input of the first rectifier module (12).

4. The device for testing AC current carrying capacity of a power electronic rectifier module according to claim 1, characterized in that: The rotating voltage regulating portion of the three-phase voltage regulator (1) is provided with a fixed motor (11), and the output shaft of the motor (11) is transmission-connected to the rotating voltage regulating portion of the three-phase voltage regulator (1) to control the voltage output by the three-phase voltage regulator (1); the motor (11) is also connected to the control structure (6).

5. The device for testing AC current carrying capacity of a power electronic rectifier module according to claim 1, characterized in that: The adjustable load (5) comprises two copper rods (51) arranged in parallel, each of which is provided with a plurality of corresponding mounting through holes for setting resistance wires (52), and each of which is provided with screws (53) for fixing the resistance wires (52) in the mounting through holes. By changing the number of resistance wires (52) arranged between the two copper rods (51), the total resistance value of the load is controlled and changed.

6. The device for testing AC current carrying capacity of a power electronic rectifier module according to claim 1, characterized in that: The output end of the first rectifier module (12) to be tested is further provided with a second rectifier module (13) for detecting the flow capacity, and the DC output end of the second rectifier module (13) is connected in series with the adjustable load (5) and then connected to the output of the first rectifier module (12).

7. The device for testing AC current carrying capacity of a power electronic rectifier module according to claim 1, characterized in that: The invention also includes a support frame (14), wherein the support frame (14) is arranged as a three-layer structure, wherein the first layer is provided with a transformer (2) and a three-phase voltage regulator (1); the second layer is provided with an adjustable load (5); the third layer is provided with a rectifier module; and a mounting plate (141) is further provided between the second and third layers; and a control structure (6), a timer (7), and a counter (8) are fixedly provided on the mounting plate (141).

8. The device for testing AC current carrying capacity of a power electronic rectifier module according to claim 7, characterized in that: It also includes a heat dissipation structure (15), which includes a plurality of fans (151); the fans (151) are respectively arranged on the third layer and the second layer of the support frame (14).

9. A method for testing the AC current carrying capacity of a power electronic rectifier module, characterized in that: The testing device according to any one of claims 1 to 8 comprises the following steps: Step 1: The control structure (6) sets the temperature variation range, current variation range, number of cycles and running time according to the input parameters; Step 2: The control structure (6) switches on the three-phase voltage regulator (1) and the transformer (2) according to the start-up operation instruction, and supplies power to the first rectifier module (12) on the secondary side of the transformer (2); Step 3: The current detection structure (4) detects the current output from the first rectifier module (12) to the adjustable load (5), determines whether the current exceeds the set current variation range, and the control structure (6) controls the motor (11) connected to the three-phase voltage regulator (1) to adjust the output voltage and control the current of the adjustable load (5) within the current variation range; Step 4: The temperature detection structure (3) detects whether the temperature of the first rectifier module (12) exceeds the temperature variation range; if it exceeds the temperature variation range, the control structure (6) controls the three-phase contactor (9) to disconnect, disconnects the connection between the three-phase voltage regulator (1) and the transformer (2), controls the heat dissipation structure (15) to start, and reduces the temperature of the first rectifier module (12) until the temperature reaches the set lower temperature limit, which is recorded as one cycle by the counter (8), and enters the next step; otherwise, return to step 3 and keep detecting temperature changes and current changes; Step 5: The control structure (6) determines whether the actual number of cycles reaches the set number of cycles and whether the actual running time reaches the set running time based on the recorded values ​​of the counter (8) and the timer (7); if one of the conditions is met, the test ends; otherwise, it returns to step 2 and continues the test.

10. A method for testing the AC current carrying capacity of a power electronic rectifier module according to claim 9, characterized in that: The voltage range of the secondary side output of the transformer (2) is 3V~10V, and the resistance of the adjustable load (5) is 1 milliohm~20 milliohm; the current variation range set in step 1 is 300A~330A.

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