Insulation voltage-withstanding safety loop detection circuit and system

Abstract

The utility model provides an insulation and voltage resistance safety loop detection circuit and system. The circuit comprises an insulation and voltage resistance test device, a PLC controller, two protection loops and a test needle group. Any one protection loop comprises a switch protection loop I, a switch protection loop II and a switch protection loop III; the test needle group comprises a positive electrode test needle and a negative electrode test needle; the positive electrode test needle or the negative electrode test needle is connected with the input end I or the input end II of the PLC after passing through the switch protection loop I, the switch protection loop II and the switch protection loop III in any protection loop; and the positive electrode test needle or the negative electrode test needle is also connected with a high-voltage positive electrode end or a high-voltage negative electrode end of the insulation and voltage resistance test equipment after passing through the switch protection loop I and the switch protection loop III in any protection loop. According to the utility model, the two protection loops and the test needle group are additionally arranged between the insulation and voltage resistance test equipment and the PLC to carry out safety loop detection, so that the safety and the stability of the high-voltage test are improved.

Description

Technical Field

[0001] The utility model relates to the field of insulation withstand voltage testing, and in particular to an insulation withstand voltage safety loop detection circuit and system. Background Art

[0002] At present, the power battery / energy storage battery PACK process has become the mainstream of battery market production, among which insulation withstand voltage (high voltage test) is one of the most important factors in the safety of power batteries / energy storage batteries. The insulation withstand voltage (high voltage test) test equipment itself has a defect that the two test lines are not connected to the tested battery, that is, the two test lines are not connected to the load and the no-load test result is OK. Therefore, when testing the battery PACK, the bipolar cables must be connected to the test load. Before the test, the bipolar cables must be tested for safety circuits to ensure that the load test is OK. Therefore, the insulation withstand voltage (high voltage test) directly reflects the quality of the product and is related to the safety of the product. Utility Model Content

[0003] In view of this, the purpose of the utility model is to provide an insulation withstand voltage safety circuit detection circuit and system, adding two protection circuits and test needle groups between the insulation withstand voltage test equipment and the PLC controller to perform safety circuit detection, thereby improving the safety and stability of high voltage testing.

[0004] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0005] An insulation withstand voltage safety circuit detection circuit includes an insulation withstand voltage test device and a PLC controller, and also includes:

[0006] Two protection circuits and a test needle group; wherein, any one protection circuit includes switch protection circuit one, switch protection circuit two and switch protection circuit three; the test needle group includes a positive test needle and a negative test needle.

[0007] One end of the positive test needle is connected to the test surface of the test product, and the other end of the positive test needle is connected to the input terminal 1 of the PLC controller after passing through the switch protection circuit 1, the switch protection circuit 2 and the switch protection circuit 3 in any protection circuit. One end of the positive test needle is also connected to the high-voltage positive terminal of the insulation withstand voltage test equipment after passing through the switch protection circuit 1 and the switch protection circuit 3 in any protection circuit.

[0008] One end of the negative test needle is connected to the test surface of the test product, and the other end of the negative test needle is connected to the input terminal 2 of the PLC controller after passing through the switch protection circuit 1, the switch protection circuit 2 and the switch protection circuit 3 in another protection circuit. One end of the negative test needle is also connected to the high-voltage negative terminal of the insulation withstand voltage test equipment after passing through the switch protection circuit 1 and the switch protection circuit 3 in another protection circuit.

[0009] In the present invention, the positive electrode test needle includes a first positive electrode test needle and a second positive electrode test needle; the negative electrode test needle includes a first negative electrode test needle and a second negative electrode test needle.

[0010] In the utility model, the switch protection circuit 1 in any one protection circuit at least includes a relay KV1 and a relay KV2 connected in parallel with each other; the switch protection circuit 1 in the other protection circuit at least includes a relay KV3 and a relay KV4 connected in parallel with each other.

[0011] In the utility model, the switch protection circuit 2 in any one protection circuit includes at least a relay KV5 and a relay KV6 connected in parallel with each other; the switch protection circuit 2 in the other protection circuit includes at least a relay KV7 and a relay KV8 connected in parallel with each other.

[0012] In the utility model, the first input terminal of the PLC controller includes an input X1 terminal and an input COM1 terminal; the second input terminal of the PLC controller includes an input X2 terminal and an input COM2 terminal; one end of the first positive test needle passes through the relay KV1 and the relay KV5 and is connected to the input X1 terminal; one end of the second positive test needle passes through the relay KV2 and the relay KV6 and is connected to the input COM1 terminal.

[0013] One end of the first negative pole test needle passes through the relay KV4 and the relay KV8 and is connected to the input X2 terminal; one end of the second negative pole test needle passes through the relay KV3 and the relay KV7 and is connected to the input COM2 terminal.

[0014] In the present invention, the switch protection circuit three in any one protection circuit includes at least a relay group A; the switch protection circuit three in the other protection circuit includes at least a relay group B.

[0015] In the utility model, one end of the positive test needle is also connected to the common end of relay group A after passing through the normally open end of relay KV1 and the normally open end of relay KV2, and the normally open end of relay group A is connected to the high-voltage positive end of the insulation withstand voltage test equipment.

[0016] One end of the negative electrode test needle is also connected to the common end of relay group B after passing through the normally open end of relay KV3 and the normally open end of relay KV4, and the normally open end of relay group B is connected to the high-voltage negative end of the insulation withstand voltage test equipment.

[0017] In the utility model, the Y1 end of the PLC controller is connected to the end pin one of the coil in relay group A; the Y2 end of the PLC controller is connected to the end pin one of the coil in relay group B; the Y3 end of the PLC controller is respectively connected to the end pin one of the coil in relay KV3 and to the end pin one of the coil in relay KV4; the Y4 end of the PLC controller is respectively connected to the end pin one of the coil in relay KV1 and to the end pin one of the coil in relay KV2; the Y5 end of the PLC controller is respectively connected to the end pin two of the coil in relay KV5, to the end pin two of the coil in relay KV6, to the end pin two of the coil in relay KV7, and to the end pin two of the coil in relay KV8.

[0018] In order to achieve the above purpose, the utility model also adopts the following technical solutions:

[0019] An insulation withstand voltage safety circuit detection system at least comprises: a low voltage circuit detection protection module and a high voltage test protection module.

[0020] Among them, the low-voltage circuit detection and protection module is composed of the positive test needle or the negative test needle, the switch protection circuit one, the switch protection circuit two and the switch protection circuit three in any protection circuit, and the PLC controller.

[0021] In the low-voltage circuit detection and protection module, one end of the positive test needle or the negative test needle is connected to the test surface of the test product, and the other end of the positive test needle or the negative test needle is connected to the input end of the PLC controller after passing through switch protection circuit one, switch protection circuit two and switch protection circuit three in any protection circuit.

[0022] The high-voltage test protection module is composed of the positive test needle or the negative test needle, the switch protection circuit 1 and the switch protection circuit 3 in any one of the protection circuits, and the insulation withstand voltage test equipment.

[0023] In the high-voltage test protection module, one end of the positive test needle is connected to the test surface of the test product, and the other end of the positive test needle is connected to the high-voltage positive terminal of the insulation withstand voltage test equipment after passing through the switch protection circuit one and the switch protection circuit three in any one protection circuit; one end of the negative test needle is connected to the test surface of the test product, and the other end of the negative test needle is connected to the high-voltage negative terminal of the insulation withstand voltage test equipment after passing through the switch protection circuit one and the switch protection circuit three in any one protection circuit.

[0024] In the present invention, the high voltage test protection module test is performed only when the low voltage circuit detection protection module has passed the test.

[0025] Compared with the prior art, the beneficial effects of the utility model are:

[0026] The utility model proposes an insulation withstand voltage safety circuit detection circuit and system, which adds two protection circuits and a test needle group between the insulation withstand voltage test equipment and the PLC controller to perform safety circuit detection, thereby improving the safety and stability of high-voltage testing. The utility model performs low-voltage circuit detection of the PLC controller through switch protection circuit 1, switch protection circuit 2, and analog switch disconnection and connection control of the switch protection circuit, and switches the high-voltage circuit to ensure the completion of the high-voltage test, thereby improving the safety of the test product. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 It is a structural schematic diagram of an insulation withstand voltage safety loop detection circuit of a preferred embodiment of the utility model.

[0028] Figure 2 The utility model is a circuit schematic diagram of an insulation withstand voltage safety loop detection circuit according to a preferred embodiment of the utility model. DETAILED DESCRIPTION

[0029] In order to facilitate the understanding of the present invention, the present invention will be described more comprehensively with reference to the accompanying drawings. The accompanying drawings provide preferred embodiments of the present invention. However, the present invention can be implemented in many different forms and is not limited to the embodiments described herein.

[0030] Embodiment 1:

[0031] In the existing technology, there are many factors affecting the battery insulation withstand voltage (high voltage test), which may lead to test failure or poor contact, etc., directly affecting the safety of the product. Please refer to Figure 1 In a preferred embodiment, an insulation withstand voltage safety circuit detection circuit includes an insulation withstand voltage test device and a PLC controller, and further includes:

[0032] Two protection circuits and a test needle group; wherein, any one protection circuit includes switch protection circuit one, switch protection circuit two and switch protection circuit three; the test needle group includes a positive test needle and a negative test needle.

[0033] It should be noted that the safety circuit detection circuit of this embodiment has both weak current lines and strong current circuits, namely, two connection circuits of the PLC controller and the insulation withstand voltage test equipment. After the high-voltage test, if the relay switched in the protection circuit is damaged and the contact is not switched back to the weak circuit, the high voltage may cause the PLC controller to burn out. Therefore, two relay protections are designed for each line of the circuit of this embodiment. Even if one of the relays is damaged, it will not cause a high-voltage circuit, which can ensure the safety of product testing to a greater extent.

[0034] In this embodiment, there are two positive test needles and two negative test needles respectively. The insulation withstand voltage (high voltage) test bipolar cable will test OK without contacting the load. Therefore, when testing the product, it is necessary to ensure that the bipolar test needles are in 100% contact with the test surface of the tested product to effectively ensure the effectiveness and safety of the product test.

[0035] One end of the positive test needle is connected to the test surface of the test product, and the other end of the positive test needle is connected to the input terminal 1 of the PLC controller after passing through the switch protection circuit 1, the switch protection circuit 2 and the switch protection circuit 3 in any protection circuit. One end of the positive test needle is also connected to the high-voltage positive terminal of the insulation withstand voltage test equipment after passing through the switch protection circuit 1 and the switch protection circuit 3 in any protection circuit.

[0036] One end of the negative test needle is connected to the test surface of the test product, and the other end of the negative test needle is connected to the input terminal 2 of the PLC controller after passing through the switch protection circuit 1, the switch protection circuit 2 and the switch protection circuit 3 in another protection circuit. One end of the negative test needle is also connected to the high-voltage negative terminal of the insulation withstand voltage test equipment after passing through the switch protection circuit 1 and the switch protection circuit 3 in another protection circuit.

[0037] It should be noted that, in the present invention, the first input terminal of the PLC controller includes the input X1 terminal and the input COM1 terminal; the second input terminal of the PLC controller includes the input X2 terminal and the input COM2 terminal. Two test pins of the same polarity are respectively connected to the input X1, X2 and COM1, COM2 terminals of the PLC controller. The two test pins are connected to exchange information with the PLC through a relay. The product test surface is equivalent to a switch. After the contact is connected, the PLC performs a safety circuit detection. The two positive test pins are connected, and the two negative test pins are connected. The PLC receives two input signals of X1 and X2, proving that the two polarity test pins are in 100% good contact with the tested product. After the above conditions are met, the PLC sends a signal to other relays to switch the high-voltage test line, start the high-voltage test until the test is OK, and then stop the test.

[0038] In the present invention, the positive electrode test needle includes a first positive electrode test needle and a second positive electrode test needle; the negative electrode test needle includes a first negative electrode test needle and a second negative electrode test needle.

[0039] As attached Figure 2 As shown, the first positive electrode test needle, the second positive electrode test needle, the first negative electrode test needle and the second negative electrode test needle are test needles 1, 2, 3 and 4 respectively.

[0040] In this embodiment, the switch protection circuit 1 in any one protection circuit at least includes a relay KV1 and a relay KV2 connected in parallel; the switch protection circuit 1 in the other protection circuit at least includes a relay KV3 and a relay KV4 connected in parallel. The switch protection circuit 2 in any one protection circuit at least includes a relay KV5 and a relay KV6 connected in parallel; the switch protection circuit 2 in the other protection circuit at least includes a relay KV7 and a relay KV8 connected in parallel.

[0041] Furthermore, one end of the first positive test needle passes through the relay KV1 and the relay KV5 and is connected to the input X1 terminal; one end of the second positive test needle passes through the relay KV2 and the relay KV6 and is connected to the input COM1 terminal. One end of the first negative test needle passes through the relay KV4 and the relay KV8 and is connected to the input X2 terminal; one end of the second negative test needle passes through the relay KV3 and the relay KV7 and is connected to the input COM2 terminal.

[0042] It should be noted that, first, when the test equipment is started, the positive and negative polarity test pins are pressed down; once the test pins are pressed down, the signal relays KV5, KV6, KV7, and KV8 are energized, causing the A9, A11, A14, and A16 lines to close, establishing a connection between the weak current lines; among them, the A9, A11, A14, and A16 lines refer to the normally open current lines in the relays, and when energized, the lines will be closed and connected.

[0043] At this time, if the two polarity test pins are in good contact, it is equivalent to a closed switch, which will send X1 and X2 signals to the PLC controller.

[0044] When the PLC controller receives the X1 and X2 signals, it turns off the Y5 signal, causing the A10, A12, A13, A15 and other lines of relays KV5, KV6, KV7, KV8 to close, cutting off the connection of the weak current circuit. Among them, the A10, A12, A13, A15 and other lines refer to the normally closed current lines in the relay. At this time, the lines will close and cut off the connection of the weak current circuit.

[0045] In this embodiment, the first layer of protection ensures that the wiring of the two test needles of the same polarity is separated from the high-voltage test line, the weak-current line is connected to the normally closed relay, and the high-voltage test line is connected to the normally open circuit, which prevents the test needle from carrying high voltage. The weak-current circuit detection ensures that the two-polarity test needles are in good contact with the surface of the workpiece being tested.

[0046] The second layer of protection is the weak current line, that is, the PLC signal line and COM- line, which are connected to the normally open circuit of the relay to prevent the first layer of protection from failing and the relay contacts from burning out and failing to disconnect the line, and to prevent high voltage electricity from generating a loop with the PLC controller and burning out the PLC controller.

[0047] In this embodiment, the switch protection circuit three in any one protection circuit includes at least relay group A; the switch protection circuit three in the other protection circuit includes at least relay group B.

[0048] Preferably, relay groups A and B can both adopt the design of 4PCS relays connected in parallel with normally open contacts, so that even if 1 or 2PCS relays are damaged, the test effect will not be affected. In other words, the third layer of protection is that the positive and negative poles of the high-voltage line are connected in parallel with 4PCS relays respectively, that is, if 1 or 2 of the 4PCS relays do not work at the same time, it will not affect the test and can work normally.

[0049] In this embodiment, one end of the positive electrode test needle is connected to the common end of relay group A after passing through the normally open end of relay KV1 and the normally open end of relay KV2, and the normally open end of relay group A is connected to the high-voltage positive end of the insulation withstand voltage test equipment. One end of the negative electrode test needle is connected to the common end of relay group B after passing through the normally open end of relay KV3 and the normally open end of relay KV4, and the normally open end of relay group B is connected to the high-voltage negative end of the insulation withstand voltage test equipment.

[0050] It should be noted that when the low-voltage circuit test is completed and the connection of the weak current circuit is cut off, it will switch to the safety circuit test link of the high-voltage circuit. Next, a start signal is sent to the Y3 and Y4 terminals in the PLC controller to close the A2, A3, A6, A7 and other lines of relays KV1, KV2, KV3, KV4, and switch the circuit to the high-voltage circuit connection state. The PLC controller sends Y1 and Y2 signals again to close the A17, A19, A21, A23, A26, A28, A30, A32 and other lines of relays KV9, KV10, KV11, KV12, KV13, KV14, KV15, KV16, and connect the positive and negative high-voltage lines of both polarities to the load.

[0051] At this point, the PLC controller starts the insulation withstand voltage (high voltage) test until the test is completed.

[0052] It should be noted that the Y1 terminal of the PLC controller is connected to the terminal pin one of the coil in relay group A; the Y2 terminal of the PLC controller is connected to the terminal pin one of the coil in relay group B; the Y3 terminal of the PLC controller is respectively connected to the terminal pin one of the coil in relay KV3 and the terminal pin one of the coil in relay KV4; the Y4 terminal of the PLC controller is respectively connected to the terminal pin one of the coil in relay KV1 and the terminal pin one of the coil in relay KV2; the Y5 terminal of the PLC controller is respectively connected to the terminal pin two of the coil in relay KV5, the terminal pin two of the coil in relay KV6, the terminal pin two of the coil in relay KV7, and the terminal pin two of the coil in relay KV8.

[0053] When the test is completed, the PLC controller receives an OK or NG signal and determines the test result based on the signal.

[0054] If the test result is OK, close the Y1, Y2, Y3, Y4 signals and A18, A20, A22, A24, A25, A27, A29, A31 and other lines, cut off the third layer of protection high voltage circuit, and at the same time close the A1, A4, A5, A8 and other lines, cut off the first layer of protection high voltage circuit, restore the equipment to the initial state, and prepare for the next test cycle.

[0055] In summary, the embodiment of the utility model ensures the safety and stability during the test process through detailed steps and signal control, and can process the test results in a timely manner and perform the next step of operation.

[0056] Embodiment 2:

[0057] In a preferred embodiment, an insulation withstand voltage safety circuit detection system includes at least: a low-voltage circuit detection protection module and a high-voltage test protection module.

[0058] Among them, the low-voltage circuit detection and protection module is composed of the positive test needle or the negative test needle, the switch protection circuit one, the switch protection circuit two and the switch protection circuit three in any protection circuit, and the PLC controller.

[0059] In the low-voltage circuit detection and protection module, one end of the positive test needle or the negative test needle is connected to the test surface of the test product, and the other end of the positive test needle or the negative test needle is connected to the input end of the PLC controller after passing through switch protection circuit one, switch protection circuit two and switch protection circuit three in any protection circuit.

[0060] The high-voltage test protection module is composed of the positive test needle or the negative test needle, the switch protection circuit 1 and the switch protection circuit 3 in any one of the protection circuits, and the insulation withstand voltage test equipment.

[0061] In the high-voltage test protection module, one end of the positive test needle is connected to the test surface of the test product, and the other end of the positive test needle is connected to the high-voltage positive terminal of the insulation withstand voltage test equipment after passing through the switch protection circuit one and the switch protection circuit three in any one protection circuit; one end of the negative test needle is connected to the test surface of the test product, and the other end of the negative test needle is connected to the high-voltage negative terminal of the insulation withstand voltage test equipment after passing through the switch protection circuit one and the switch protection circuit three in any one protection circuit.

[0062] It should be noted that the system of this embodiment includes two parts: a low-voltage circuit detection and protection module and a high-voltage test and protection module. By using this structure, safety risks caused by poor contact, relay damage, etc. can be effectively avoided.

[0063] The low voltage circuit detection protection module is mainly responsible for confirming whether the connection between the test pin and the tested product is good in a low voltage environment. This is achieved by detecting the signal exchange between the positive and negative test pins and the PLC controller, ensuring that the bipolar test pins are in 100% good contact with the tested product. If the connection is good, the PLC controller will receive the corresponding signal, which indicates that the low voltage circuit detection has passed.

[0064] Among them, the high-voltage test protection module test is performed only when the low-voltage circuit detection protection module passes the test.

[0065] The high voltage test protection module is responsible for the actual high voltage withstand test. Once the low voltage circuit test passes, the system will switch to high voltage test mode. This module uses multiple relays to protect the PLC controller from high voltage damage while ensuring the safety of the test process. If the test is completed and successful, the PLC controller will receive a completion signal and judge the test result accordingly.

[0066] The embodiment of the utility model pays special attention to the redundant use of relays, that is, at least two relays are used in each key link, which are used in parallel to ensure that even if one relay fails, the system can still operate normally, greatly improving the reliability and safety of the system. In addition, by finely controlling the closing and opening of the relays at different stages, the high voltage withstand test can be effectively completed while ensuring safety.

[0067] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "illustrative embodiments", "examples", "specific examples", or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the utility model. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0068] In the description of the present invention, it should be understood that terms such as "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0069] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present utility model, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0070] Although the utility model is described in conjunction with the above specific embodiments, it is obvious that those skilled in the art can make many substitutions, modifications and changes based on the above content. Therefore, all such substitutions, improvements and changes are included in the spirit and scope of the appended claims.

Claims

1. An insulation withstand voltage safety circuit detection circuit, comprising an insulation withstand voltage test device and a PLC controller, characterized in that: Also includes: Two protection circuits and a test needle group; wherein any one protection circuit includes switch protection circuit 1, switch protection circuit 2 and switch protection circuit 3; the test needle group includes a positive test needle and a negative test needle; One end of the positive test needle is connected to the test surface of the test product, and the other end of the positive test needle is connected to the input terminal 1 of the PLC controller after passing through the switch protection circuit 1, the switch protection circuit 2 and the switch protection circuit 3 in any protection circuit, and one end of the positive test needle is also connected to the high-voltage positive terminal of the insulation withstand voltage test equipment after passing through the switch protection circuit 1 and the switch protection circuit 3 in any protection circuit; one end of the negative test needle is connected to the test surface of the test product, and the other end of the negative test needle is connected to the input terminal 2 of the PLC controller after passing through the switch protection circuit 1, the switch protection circuit 2 and the switch protection circuit 3 in another protection circuit, and one end of the negative test needle is also connected to the high-voltage negative terminal of the insulation withstand voltage test equipment after passing through the switch protection circuit 1 and the switch protection circuit 3 in another protection circuit.

2. The insulation withstand voltage safety circuit detection circuit according to claim 1, characterized in that: The positive electrode test needle comprises a first positive electrode test needle and a second positive electrode test needle; The negative electrode test needle includes a first negative electrode test needle and a second negative electrode test needle.

3. The insulation withstand voltage safety circuit detection circuit according to claim 2, characterized in that: The switch protection circuit 1 in any one of the protection circuits at least comprises a relay KV1 and a relay KV2 connected in parallel with each other; The switch protection circuit 1 in the other protection circuit at least includes a relay KV3 and a relay KV4 connected in parallel with each other.

4. The insulation withstand voltage safety circuit detection circuit according to claim 3, characterized in that: The switch protection circuit 2 in any one of the protection circuits at least includes a relay KV5 and a relay KV6 connected in parallel with each other; The switch protection circuit 2 in the other protection circuit at least includes a relay KV7 and a relay KV8 connected in parallel with each other.

5. The insulation withstand voltage safety circuit detection circuit according to claim 4, characterized in that: The input terminal 1 of the PLC controller includes an input X1 terminal and an input COM1 terminal; The second input terminal of the PLC controller includes an input X2 terminal and an input COM2 terminal; One end of the first positive electrode test needle passes through the relay KV1 and the relay KV5 and is connected to the input X1 terminal; one end of the second positive electrode test needle passes through the relay KV2 and the relay KV6 and is connected to the input COM1 terminal; One end of the first negative pole test needle passes through the relay KV4 and the relay KV8 and is connected to the input X2 terminal; one end of the second negative pole test needle passes through the relay KV3 and the relay KV7 and is connected to the input COM2 terminal.

6. The insulation withstand voltage safety circuit detection circuit according to claim 5, characterized in that: The switch protection circuit three in any one protection circuit comprises at least a relay group A; The switch protection circuit three in the other protection circuit includes at least a relay group B.

7. The insulation withstand voltage safety circuit detection circuit according to claim 6, characterized in that: One end of the positive electrode test needle is also connected to the common end of relay group A after passing through the normally open end of relay KV1 and the normally open end of relay KV2, and the normally open end of relay group A is connected to the high-voltage positive end of the insulation withstand voltage test equipment; One end of the negative electrode test needle is also connected to the common end of relay group B after passing through the normally open end of relay KV3 and the normally open end of relay KV4, and the normally open end of relay group B is connected to the high-voltage negative end of the insulation withstand voltage test equipment.

8. The insulation withstand voltage safety circuit detection circuit according to claim 7, characterized in that: The Y1 terminal of the PLC controller is connected to the first terminal of the coil in relay group A; The Y2 terminal of the PLC controller is connected to the terminal pin 1 of the coil in relay group B; The Y3 terminal of the PLC controller is connected to the terminal pin 1 of the coil in the relay KV3 and the terminal pin 1 of the coil in the relay KV4 respectively; The Y4 terminal of the PLC controller is connected to the terminal pin 1 of the coil in the relay KV1 and the terminal pin 1 of the coil in the relay KV2 respectively; The Y5 terminal of the PLC controller is respectively connected to the second terminal of the coil in relay KV5, the second terminal of the coil in relay KV6, the second terminal of the coil in relay KV7, and the second terminal of the coil in relay KV8.

9. A system for detecting an insulation withstand voltage safety circuit according to any one of claims 1 to 8, characterized in that: At least: Low voltage circuit detection protection module and high voltage test protection module; Wherein, the low-voltage circuit detection and protection module is composed of the positive test needle or the negative test needle, the switch protection circuit 1, the switch protection circuit 2 and the switch protection circuit 3 in any one of the protection circuits, and the PLC controller; In the low-voltage circuit detection and protection module, one end of the positive test needle or the negative test needle is connected to the test surface of the test product, and the other end of the positive test needle or the negative test needle is connected to the input end of the PLC controller after passing through the switch protection circuit 1, the switch protection circuit 2 and the switch protection circuit 3 in any protection circuit respectively; the high-voltage test protection module is composed of the positive test needle or the negative test needle, the switch protection circuit 1 and the switch protection circuit 3 in any protection circuit, and the insulation withstand voltage test equipment; In the high-voltage test protection module, one end of the positive test needle is connected to the test surface of the test product, and the other end of the positive test needle is connected to the high-voltage positive terminal of the insulation withstand voltage test equipment after passing through the switch protection circuit one and the switch protection circuit three in any one protection circuit; one end of the negative test needle is connected to the test surface of the test product, and the other end of the negative test needle is connected to the high-voltage negative terminal of the insulation withstand voltage test equipment after passing through the switch protection circuit one and the switch protection circuit three in any one protection circuit.

10. The system of the insulation withstand voltage safety circuit detection circuit according to claim 9, characterized in that: The high voltage test protection module test is performed only after the low voltage circuit detection protection module has passed the test.

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