Test circuit and controller of power equipment

Abstract

The utility model provides a test circuit of power equipment and a controller. The test circuit comprises a first power supply, a second power supply, an external power supply, a first relay, a second relay, a third relay, an internal CAN interface and an external CAN interface, the first power supply and the second power supply are both located on a zero line and a live line, the first power supply, the second power supply and the external power supply are respectively connected with the first relay, and the first power supply, the second power supply and the external power supply are mutually connected in parallel; the internal CAN interface and the external CAN interface are connected in parallel with the second relay, the second relay is connected in series with the third relay, the second relay and the third relay are respectively connected in series with the first power supply, and the first relay and the third relay are both connected with tested power equipment. Switching of internal and external CAN communication and power supply switching are realized, and the test flexibility is improved.

Description

Technical Field

[0001] The present application relates to automatic testing technology, and in particular to a testing circuit and controller for electric power equipment. Background Art

[0002] To ensure the normal operation of power equipment, it is necessary to test the equipment. For example, the equipment can be tested for overcurrent and overvoltage. Currently, different test benches can be used to test different power equipment. Each test bench has its own circuit structure, which is complex and varied.

[0003] However, multiple test benches take up a lot of space, switching between circuits is inflexible, and cannot meet actual testing needs, affecting test efficiency. Utility Model Content

[0004] The present application provides a test circuit and a controller for an electric power device, so as to improve the test flexibility and test efficiency of the electric power device.

[0005] In a first aspect, the present application provides a test circuit for an electric power device, comprising: a first power supply, a second power supply, an external power supply, a first relay, a second relay, a third relay, an internal CAN interface, and an external CAN interface;

[0006] The first power supply and the second power supply are both located on the neutral line and the live line, the first power supply, the second power supply and the external power supply are respectively connected to the first relay, and the first power supply, the second power supply and the external power supply are connected in parallel;

[0007] The internal CAN interface and the external CAN interface are connected in parallel to the second relay, the second relay is connected in series to the third relay, the second relay and the third relay are respectively connected in series to the first power supply, and the first relay and the third relay are both connected to the power equipment under test.

[0008] In one possible implementation, the test circuit includes a fourth relay and a first dip switch;

[0009] A fourth relay is connected in series on the live wire between the first power supply and the first relay, and the fourth relay is connected in parallel with the first dip switch.

[0010] In one possible implementation, the test circuit includes a fifth relay and a second dip switch;

[0011] A fifth relay is connected in series on the live wire between the first relay and the power equipment, and the fifth relay is connected in parallel with the second dip switch.

[0012] In one possible implementation, the internal CAN interface includes a first internal interface and a second internal interface, and the external CAN interface includes a first external interface and a second external interface;

[0013] The first external interface, the first internal interface, the second external interface, and the second internal interface are connected in parallel to the second relay.

[0014] In one possible implementation, the test circuit includes a sixth relay and a third DIP switch;

[0015] A sixth relay is connected in series to the live wire between the first power supply and the second relay, and the sixth relay is connected in series to the third DIP switch.

[0016] In one possible implementation, the test circuit includes a seventh relay;

[0017] The first external interface and the first internal interface are connected in series with the third relay via the second relay;

[0018] The second external interface and the second internal interface are connected in series with the seventh relay via the second relay;

[0019] The third relay and the seventh relay are both connected to the electrical equipment under test, and the seventh relay is connected to the first power supply.

[0020] In one possible implementation, the test circuit includes an eighth relay and a fourth DIP switch;

[0021] An eighth relay is connected in series on the live wire between the first power supply and the third relay, and the eighth relay is connected in parallel with the fourth DIP switch.

[0022] In one possible implementation, the test circuit includes a ninth relay and a fifth dip switch;

[0023] A ninth relay is connected in series on the live wire between the first power supply and the seventh relay, and the ninth relay is connected in parallel with the fifth dip switch.

[0024] In a possible implementation, the DC voltage of the first power supply is greater than the DC voltage of the second power supply.

[0025] In a possible implementation, the power device is a circuit board or an inverter.

[0026] In a second aspect, the present application provides a controller, which is a cabinet of a preset material, in which a test circuit of the power equipment is integrated, and the controller is used to connect to the power equipment under test through the test circuit of the power equipment.

[0027] The present application provides a test circuit and controller for electrical equipment. The test circuit may include an internal power supply and an external power supply, wherein the internal power supply includes a first power supply and a second power supply. A first relay enables switching between the external power supply and the internal power supply, thereby meeting actual power supply voltage testing requirements and improving test flexibility. The control circuit also includes an internal CAN interface and an external CAN interface. A second relay enables communication between the internal and external CAN interfaces, enabling switching of multiple CAN communications for the electrical equipment under test, further improving test efficiency and accuracy. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present application and, together with the description, serve to explain the principles of the present application.

[0029] Figure 1 A circuit diagram of a test circuit for an electric power device provided in an embodiment of the present application;

[0030] Figure 2 A connection diagram of the first relay provided in an embodiment of the present application;

[0031] Figure 3 A schematic diagram showing the connection between the second relay and the third relay provided in an embodiment of the present application;

[0032] Figure 4 A circuit diagram of a test circuit for an electric power device provided in an embodiment of the present application;

[0033] Figure 5 A circuit diagram of a test circuit for an electric power device provided in an embodiment of the present application;

[0034] Figure 6 A schematic diagram of the connection of the controller provided in an embodiment of the present application;

[0035] Figure 7 A schematic diagram of the first-layer layout inside the controller provided in an embodiment of the present application;

[0036] Figure 8 A schematic diagram of the second-layer layout inside the controller provided in an embodiment of the present application.

[0037] The above drawings illustrate specific embodiments of the present application, which will be described in more detail below. These drawings and the textual description are not intended to limit the scope of the present application in any way, but rather to illustrate the concepts of the present application to those skilled in the art by reference to specific embodiments. DETAILED DESCRIPTION

[0038] In order to make the objectives, technical solutions and advantages of the present application clearer, the embodiments of the present application will be described in further detail below with reference to the accompanying drawings.

[0039] It should be clear that the embodiments described are only part of the embodiments of this application, not all of the embodiments. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of this application.

[0040] When the following description refers to the accompanying drawings, unless otherwise indicated, the same numbers in different drawings represent the same or similar elements. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with the present application. Instead, they are merely examples of devices and methods consistent with certain aspects of the present application, as detailed in the appended claims.

[0041] In the description of this application, it should be understood that the terms "first", "second", "third", etc. are only used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence, nor can they be understood as indicating or implying relative importance. For those of ordinary skill in the art, the specific meanings of the above terms in this application can be understood according to the specific circumstances. In addition, in the description of this application, unless otherwise specified, "multiple" refers to two or more. "And / or" describes the association relationship of associated objects, indicating that three relationships can exist. For example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone. The character " / " generally indicates that the previous and subsequent associated objects are in an "or" relationship.

[0042] It should be noted that due to space limitations, this specification does not exhaustively list all optional implementation methods. After reading this specification, those skilled in the art should be able to understand that, as long as the technical features do not contradict each other, any combination of the technical features can constitute an optional implementation method. The following describes each embodiment in detail.

[0043] Currently, test benches for PCBA (Printed Circuit Board Assembly) and inverter levels are separate. This results in bulky test equipment, a large footprint, and complex circuit structures. The PCB test bench fails to integrate all test requirements, often requiring the expansion of sub-control modules when testing PCBAs. This results in limited reusability and flexibility for the board-level test bench. Similarly, the inverter-level test bench fails to integrate all test requirements, requiring the expansion of sub-control modules when testing inverters for new projects. This results in limited reusability and flexibility for the inverter-level test bench.

[0044] In other words, separate board-level and inverter-level test benches make it impossible to perform compatibility testing on different types of power equipment. This lacks flexibility and reusability, resulting in low test efficiency and high testing costs. Therefore, circuit design for compatibility between board-level and inverter-level testing is necessary to meet actual testing requirements.

[0045] The present application provides a test circuit and controller for electric power equipment, aiming to solve the above technical problems in the prior art.

[0046] The following specific embodiments describe in detail the technical solution of the present application and how the technical solution of the present application solves the above-mentioned technical problems. The following specific embodiments can be combined with each other, and the same or similar concepts or processes may not be repeated in some embodiments. The embodiments of the present application will be described below in conjunction with the accompanying drawings.

[0047] Figure 1 FIG. 1 is a circuit diagram of a test circuit for an electric power device according to an embodiment of the present application. Figure 1 As shown, the test circuit may include: a first power supply 11, a second power supply 12, an external power supply 13, a first relay 14, a second relay 15, a third relay 16, an internal CAN interface 17, and an external CAN interface 18;

[0048] The first power supply 11 and the second power supply 12 are both located on the neutral line N and the live line L. The first power supply 11, the second power supply 12 and the external power supply 13 are respectively connected to the first relay 14. The first power supply 11, the second power supply 12 and the external power supply 13 are connected in parallel.

[0049] The internal CAN interface 17 and the external CAN interface 18 are connected in parallel to the second relay 15, the second relay 15 and the third relay 16 are connected in series, the second relay 15 and the third relay 16 are respectively connected in series to the first power supply 11, and the first relay 14 and the third relay 16 are both connected to the power equipment under test.

[0050] The power equipment under test is the object under test 19. In this embodiment, the power equipment may belong to different equipment types. For example, the power equipment may be a PCBA circuit board or an inverter. That is, the object under test 19 may be a PCBA circuit board or an inverter.

[0051] In this embodiment, the DC voltage of the first power supply 11 may be greater than the DC voltage of the second power supply 12. For example, the first power supply 11 is 220V AC and 24V DC, and the second power supply 12 is 220V AC and 12V DC.

[0052] The first relay 14 includes a switch and a coil. The first power supply 11 is connected to the coil in the first relay 14 . The second power supply 12 and the external power supply 13 are connected to the switch in the first relay 14 . Figure 2 This is the connection diagram of the first relay. Figure 2 In the example, the first power supply 11 and the coil of the first relay 14 are always connected. The first relay 14 can switch between the second power supply 12 and the external power supply 13 via a switch. That is, the first relay 14 can be connected to the first power supply 11 and the second power supply 12, or to the first power supply 11 and the external power supply 13. For example, if the voltage of the second power supply 12 is 12V and the voltage of the external power supply is 17V, when the test object 19 requires a voltage of 17V, the first relay 14 can switch to the external power supply 13 to ensure normal test progress.

[0053] In this embodiment, the test circuit is integrated into the controller. Through the controller's internal circuit design, automatic power-on and flexible switching of external control are achieved for the test object 19. By controlling the first relay 14 in the power circuit, internal power supply and external low-voltage power supply are switched in and out.

[0054] Second relay 15 includes a switch and a coil. First power supply 11 is connected to the coil in second relay 15. Internal CAN interface 17 and external CAN interface 18 are connected to the switch in second relay 15. Third relay 16 includes a switch and a coil. First power supply 11 is connected to the coil in third relay 16. The CAN interface of the object under test is connected to the switch in third relay 16. Figure 3 This is a connection diagram of the second relay and the third relay. Figure 3 In the figure, external CAN H represents the high level of external CAN interface 18, external CAN L represents the low level of external CAN interface 18, internal CAN H represents the high level of internal CAN interface 17, internal CAN L represents the low level of internal CAN interface 17, device CAN H represents the high level of the CAN interface of the test object 19, and device CAN L represents the low level of the CAN interface of the test object 19. Second relay 15 can switch the connection between internal CAN interface 17 and external CAN interface 18 through a switch. Third relay 16 can switch the connection state of test object 19 through a switch. The coils of second relay 15 and third relay 16 are respectively connected to first power supply 11.

[0055] In this embodiment, second relay 15 is used to switch internal and external CAN communications in and out, enabling flexible switching between rapid automated testing and manual troubleshooting. Control of third relay 16 switches the CAN of test object 19 in and out, completing both normal CAN communication testing of test object 19 and terminal resistance and voltage measurements when no communication is established, meeting practical testing requirements.

[0056] In an embodiment of the present application, the test circuit may include an internal power supply and an external power supply, wherein the internal power supply includes a first power supply and a second power supply. A first relay enables switching between the external and internal power supplies, facilitating the fulfillment of actual power supply voltage testing requirements and improving test flexibility. The control circuit also includes an internal CAN interface and an external CAN interface. A second relay enables communication between the internal and external CAN interfaces, enabling switching of multiple CAN communication channels for the tested electrical equipment, further improving test efficiency and accuracy.

[0057] Figure 4 FIG. 1 is a circuit diagram of a test circuit for an electric power device according to an embodiment of the present application. Figure 4 As shown, the test circuit includes a fourth relay 20, a first dip switch 21, a fifth relay 22, and a second dip switch 23;

[0058] A fourth relay 20 is connected in series on the live wire between the first power supply 11 and the first relay 14 , and the fourth relay 20 is connected in parallel with the first dip switch 21 ;

[0059] A fifth relay 22 is connected in series on the live wire between the first relay 14 and the tested electrical equipment 19 . The fifth relay 22 is connected in parallel with the second dial switch 23 .

[0060] The controller's internal circuit design enables automatic power-on of the test object 19 and flexible switching between external control. By connecting the coil of the first relay 14 in the power circuit in parallel with a series control switch, both automatic and manual switching between internal power supply and external low-voltage power is achieved. The series control switch for the coil of the first relay 14 includes a fourth relay 20 and a first DIP switch 21.

[0061] Automatic power-on and manual power-on switching are achieved by connecting a series control switch in parallel between the first relay 14 in the power supply circuit and the object under test 19. The series control switch after the first relay 14 includes a fifth relay 22 and a second dial switch 23.

[0062] That is, the fourth relay 20 and the first dip switch 21 are located between the first power supply 11 and the first relay 14 and are connected to the coil of the first relay 14 , and the fifth relay 22 and the second dip switch 23 are located between the first relay 14 and the object under test 19 .

[0063] Figure 5 FIG. 1 is a circuit diagram of a test circuit for an electric power device according to an embodiment of the present application. Figure 4 As shown, the internal CAN interface includes a first internal interface 171 and a second internal interface 172 , and the external CAN interface includes a first external interface 181 and a second external interface 182 ;

[0064] The first external interface 181 , the first internal interface 171 , the second external interface 182 , and the second internal interface 172 are connected in parallel to the second relay 15 .

[0065] The test circuit includes a sixth relay 24 and a third dial switch 25;

[0066] A sixth relay 24 is connected in series to the live wire between the first power source 11 and the second relay 15 . The sixth relay 24 is connected in parallel to the third dial switch 25 .

[0067] The test circuit includes a seventh relay 26;

[0068] The first external interface 181 and the first internal interface 171 are connected in series with the third relay 16 through the second relay 15;

[0069] The second external interface 182 and the second internal interface 172 are connected in series with the seventh relay 26 through the second relay 15;

[0070] The third relay 16 and the seventh relay 26 are both connected to the electrical equipment 19 under test, and the seventh relay 26 is connected to the first power source 11 .

[0071] The test circuit includes an eighth relay 27 and a fourth dial switch 28;

[0072] An eighth relay 27 is connected in series to the live wire between the first power source 11 and the third relay 16 , and the eighth relay 27 is connected in parallel to the fourth dial switch 28 .

[0073] The test circuit includes a ninth relay 29 and a fifth dial switch 30;

[0074] A ninth relay 29 is connected in series to the live wire between the first power source 11 and the seventh relay 26 . The ninth relay 29 is connected in parallel to the fifth dial switch 30 .

[0075] Specifically, external CAN1 H represents a high level on first external interface 181, external CAN1 L represents a low level on first external interface 181, internal CAN1 H represents a high level on first internal interface 171, and internal CAN1 L represents a low level on first internal interface 171. External CAN2 H represents a high level on second external interface 182, external CAN2 L represents a low level on second external interface 182, internal CAN2 H represents a high level on second internal interface 172, and internal CAN2 L represents a low level on second internal interface 172. Device CAN0 H represents a high level on CAN0 of object under test 19, device CAN0 L represents a low level on CAN0 of object under test 19, device CAN1 H represents a high level on CAN1 of object under test 19, device CAN1 L represents a low level on CAN1 of object under test 19, device CAN2 H represents a high level on CAN2 of object under test 19, and device CAN2 L represents a low level on CAN2 of object under test 19.

[0076] The first power supply 11 is connected to the coil of the third relay 16, the coil of the second relay 15, and the coil of the seventh relay 26, respectively. By performing parallel processing of the series control switch on the coil of the second relay 15 in the communication loop, the automatic switching in and out and manual switching in and out of the internal CAN and external CAN communications, as well as the flexible switching between rapid automated testing and manual troubleshooting testing, are achieved. The series control switch corresponding to the coil of the second relay 15 includes the sixth relay 24 and the third dial switch 25. By controlling the third relay 16 by the eighth relay 27 and the fourth dial switch 28, the switching in and out of CAN0 of the object under test 19 is achieved to complete the normal communication test of CAN0 and the terminal resistance and voltage measurement when there is no communication connection. By controlling the seventh relay 26 by the ninth relay 29 and the fifth dial switch 30, the test switching of the multi-channel CAN communication of the object under test 19 is achieved. The multi-channel CAN communication refers to CAN1 and CAN2 of the object under test 19.

[0077] Figure 6 Schematic diagram of the connection of the controller provided in accordance with the embodiment of the present application. Figure 6 As shown, the controller 60 may be connected to the object under test 19 , a host computer 61 , a multimeter 62 , a low-voltage power supply 63 , a high-voltage power supply 64 , and a signal simulator 65 .

[0078] The controller is integrated with a test circuit. A host computer 61 sends test instructions to the controller 60, and the test circuit tests the object under test 19. The host computer may be programmed with a test method. For example, the test method may be to, in response to a test instruction for an electrical device, obtain identification information of the electrical device. The identification information may indicate the device type. Based on the identification information, test parameters are retrieved for the electrical device. The test parameters indicate the electrical performance of the electrical device. Based on the identification information and the test parameters, the electrical device is tested, and a test report is generated and output.

[0079] Specifically, in the testing method, the power equipment is tested according to the identification information and test parameters of the power equipment, and a test report of the power equipment is generated and output, which may include: performing a low-voltage test on the power equipment according to the test parameters of the power equipment to obtain a low-voltage test result; performing a high-voltage test on the power equipment according to the identification information and test parameters of the power equipment to obtain a high-voltage test result; and generating and outputting a test report of the power equipment based on the low-voltage test result and the high-voltage test result.

[0080] Performing a low-voltage test on the power equipment according to the test parameters of the power equipment to obtain a low-voltage test result may include: determining a test version of the power equipment; wherein the test version represents the software version currently used by the power equipment; performing a low-voltage test on the power equipment according to the test parameters and test version of the power equipment to obtain a low-voltage test result; wherein the low-voltage test includes at least one of a communication test, a control chip pin reading test, an integrated circuit test, and a circuit safety test.

[0081] Determining the test version of the power device may include: determining the power-on time of the power device; and reading the test version of the power device if the power-on time reaches a preset time window length.

[0082] Performing a high-voltage test on the power equipment according to the identification information and test parameters of the power equipment to obtain a high-voltage test result may include: if the device type of the power equipment is determined to be a single-board device according to the identification information of the power equipment, then performing a first high-voltage test on the power equipment according to the test parameters of the power equipment to obtain a high-voltage test result; wherein the first high-voltage test includes a high-voltage sampling test and a high-voltage drive test; if the device type of the power equipment is determined to be an inverter device according to the identification information of the power equipment, then performing a second high-voltage test on the power equipment according to the test parameters of the power equipment to obtain a high-voltage test result; wherein the second high-voltage test includes at least one of a high-voltage sampling test, a high-voltage drive test, a current calibration test, an overcurrent test, an overvoltage test, and an output power test.

[0083] The second high-voltage test is an overcurrent test. The test parameters of the power equipment include a current threshold range, a temperature threshold range, and the number of tests. The high-voltage test results include the overcurrent point current. According to the test parameters of the power equipment, a second high-voltage test is performed on the power equipment to obtain a high-voltage test result, which may include: supplying power to the power equipment within the current threshold range, and recording the current power supply current and power supply times; obtaining the current temperature information of the power equipment, and if the current temperature information is within the temperature threshold range and the power supply times are less than or equal to the test times, determining whether the power equipment has an overcurrent fault; if it is determined that the power equipment has an overcurrent fault, determining that the power supply current is the overcurrent point current.

[0084] Obtaining identification information of the electrical equipment in response to a test instruction for the electrical equipment may include: obtaining test configuration information of the electrical equipment in response to the test instruction for the electrical equipment; wherein the test configuration information represents the electrical properties of the electrical equipment; and obtaining a character located at a preset position from the test configuration information as identification information of the electrical equipment.

[0085] According to the identification information of the power equipment, the test parameters of the power equipment are called, including: according to the preset association relationship, determining the parameter type corresponding to the identification information of the power equipment as the target type; wherein the preset association relationship represents the association relationship between the identification information and the parameter type; obtaining the parameters corresponding to the target type from the test configuration information as the test parameters of the power equipment.

[0086] In this embodiment, the host computer 61 determines the identification information of the power device by responding to a test instruction for the power device. Based on the different identification information, the host computer 61 calls the test parameters of the power device. That is, different power devices correspond to different test parameters, enabling targeted testing of different power devices and improving test compatibility. Based on the identification information and test parameters of the power device, the power device is tested and a test report for the power device is generated and output. By distinguishing different electronic devices and calling different test parameters, the test bench switch is eliminated, saving manpower and time, and improving testing flexibility and efficiency.

[0087] The controller 60 can be a cabinet of a preset material, for example, it can be modified from a stainless steel control cabinet. The design of the controller 60 can include: control wiring panel design, internal layout design, and internal circuit design, etc. The internal circuit design is the test circuit of the power equipment in the embodiment of the present application. For the control wiring panel design, the panel may include: a power-on switch, a display, an emergency stop button, a toggle switch, a banana socket, a DB9 pin socket, a network port, a USB port, etc. The controller 60 is connected to the external control unit through the panel, and the external control unit can be a host computer 61, a test object 19, an external device, etc. The test object 19 can be a circuit board or an inverter, and the external device can be a multimeter 62, a low-voltage power supply 63, a high-voltage power supply 64, and a signal simulator 65, etc.

[0088] The internal layout of controller 60 is designed to enable multifunctional intelligent testing while maintaining a compact size. The controller 60 is divided into two layers. The first layer includes a residual current circuit breaker, a 24V power supply, a 12V power supply, a relay box, expansion relays, sockets, and wiring ducts. Figure 7 This is a schematic diagram of the first-layer layout inside the controller. Figure 7 In the example, relays 1 through 9 are expansion relays, and the sockets can include five-hole modular socket 1, five-hole modular socket 2, and five-hole modular socket 3. For a 2.5 square gray double-layer straight-insert spring terminal block, approximately 60 pieces are used to fill the entire row. Any remaining pieces are kept as spares. Figure 7 The shaded area in the middle diagonal line is the 35mm aluminum rail.

[0089] The second layer inside the controller 60 may include: a relay box, a CAN communication box, a signal simulator, a USB to 232 converter, a USB to 485 converter, a USB expander, etc. The size of the second layer of the controller 60 can be the same as the size of the first layer. For example, the width of the first and second layers is 350mm and the height is 450mm. The second layer can be divided into two parts, the upper part of which is detachable. The upper part includes the relay box and the CAN communication box, and the lower part includes the signal simulator, the USB to 232 converter, the USB to 485 converter, the USB expander, etc. The four sides and the middle part of the second layer can also be provided with wiring troughs, which can also be 25mm wide and 50mm high. Figure 8 This is a schematic diagram of the second-layer layout inside the controller. Figure 8 In the embodiment, the second layer may include a plurality of relay boxes, and the sizes of the relay boxes may be the same.

[0090] In this embodiment, multiple external devices can be connected to the controller through the USB port, network port, and bus settings of the switch of the controller 60 to achieve diversification of external devices and improve the scalability of external devices.

[0091] Those skilled in the art will readily appreciate other embodiments of the present application after considering the specification and practicing the utility model disclosed herein. This application is intended to cover any variations, uses, or adaptations of the present application that follow the general principles of this application and include common knowledge or customary techniques in the art not disclosed herein. The description and examples are to be considered as exemplary only, and the true scope and spirit of the present application are indicated by the following claims.

[0092] It should be understood that the present application is not limited to the exact structure described above and shown in the drawings, and that various modifications and changes may be made without departing from the scope thereof. The scope of the present application is limited only by the appended claims.

Claims

1. A test circuit for an electric power device, characterized in that: The test circuit includes: a first power supply, a second power supply, an external power supply, a first relay, a second relay, a third relay, an internal CAN interface, and an external CAN interface; The first power supply and the second power supply are both located on the neutral line and the live line, the first power supply, the second power supply and the external power supply are respectively connected to the first relay, and the first power supply, the second power supply and the external power supply are connected in parallel; The internal CAN interface and the external CAN interface are connected in parallel to the second relay, the second relay is connected in series to the third relay, the second relay and the third relay are respectively connected in series to the first power supply, and the first relay and the third relay are both connected to the power equipment under test.

2. The circuit according to claim 1, wherein: The test circuit includes a fourth relay and a first dial switch; A fourth relay is connected in series on the live wire between the first power supply and the first relay, and the fourth relay is connected in parallel with the first dip switch.

3. The circuit according to claim 2, characterized in that The test circuit includes a fifth relay and a second dip switch; A fifth relay is connected in series on the live wire between the first relay and the power equipment, and the fifth relay is connected in parallel with the second dip switch.

4. The circuit according to any one of claims 1 to 3, characterized in that The internal CAN interface includes a first internal interface and a second internal interface, and the external CAN interface includes a first external interface and a second external interface; The first external interface, the first internal interface, the second external interface, and the second internal interface are connected in parallel to the second relay.

5. The circuit according to claim 4, characterized in that The test circuit includes a sixth relay and a third dial switch; A sixth relay is connected in series on the live wire between the first power supply and the second relay, and the sixth relay is connected in parallel with the third DIP switch.

6. The circuit according to claim 5, characterized in that The test circuit includes a seventh relay; The first external interface and the first internal interface are connected in series with the third relay via the second relay; The second external interface and the second internal interface are connected in series with the seventh relay via the second relay; The third relay and the seventh relay are both connected to the electrical equipment under test, and the seventh relay is connected to the first power supply.

7. The circuit according to claim 6, characterized in that The test circuit includes an eighth relay and a fourth dial switch; An eighth relay is connected in series on the live wire between the first power supply and the third relay, and the eighth relay is connected in parallel with the fourth DIP switch.

8. The circuit according to claim 7, characterized in that The test circuit includes a ninth relay and a fifth dial switch; A ninth relay is connected in series on the live wire between the first power supply and the seventh relay, and the ninth relay is connected in parallel with the fifth dip switch.

9. The circuit according to claim 1, wherein: The DC voltage of the first power supply is greater than the DC voltage of the second power supply.

10. The circuit according to claim 1, wherein: The power equipment is a circuit board or an inverter.

11. A controller, characterized in that: The controller is a cabinet of a preset material, and the test circuit of the power equipment according to any one of claims 1 to 10 is integrated into the controller. The controller is used to be connected to the power equipment under test through the test circuit of the power equipment.

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