Relay life test system

Abstract

The utility model discloses a relay life test system, wherein, relay life test system includes: first switch unit, switching unit, first voltage detection device and insulation resistance testing arrangement, first voltage detection device and insulation resistance testing arrangement are parallelly connected with the relay under test respectively, switching unit is coupled with the relay under test, first voltage detection device and insulation resistance testing arrangement, and switching unit is used to switch between first voltage detection device or insulation resistance testing arrangement, to realize that only one parallel connection of both with the relay under test is on at the same time, and the parallel connection of another with the relay under test is disconnected, first switch unit is coupled between power supply and the relay under test, and first switch unit is used to be on under the condition that first voltage detection device is parallelly connected with the relay under test, to make power supply supply the power to the relay under test. The system makes voltage detection loop and insulation detection loop independent to each other, thereby has promoted the detection precision.

Description

Technical Field

[0001] This application relates to the field of power electronics technology, and in particular to a relay life testing system. Background Technology

[0002] With the rapid development of the new energy vehicle industry, the performance and reliability of high-voltage DC relays in pure electric vehicles have received increasing attention. The stability of their electrical performance directly affects the insulation safety of the battery pack and the reliability of the entire vehicle system. Electrical life testing systems, by simulating actual operating conditions and subjecting the relays to long-term, high-frequency switching operations, are a key means of evaluating their durability and stability.

[0003] In electrical life testing, both contact voltage monitoring and insulation resistance testing require connection to the circuit node where the relay contacts are located. However, the electrical requirements for the circuit state of the two devices conflict. If the two types of measuring devices are simply connected in parallel with the main circuit power supply to the same node, mutual electrical interference will occur between the ports, thereby reducing the detection accuracy. Utility Model Content

[0004] This invention aims to at least partially solve one of the technical problems in related technologies. To this end, one objective of this invention is to provide a relay life testing system that, through the coordinated control of a switching unit and a first switching unit, isolates the insulation testing device during voltage detection and cuts off the power supply and isolates the voltage detection device during insulation detection. This makes the voltage detection circuit and the insulation detection circuit independent of each other, reducing signal interference and thus improving detection accuracy.

[0005] To achieve the above objectives, a relay life testing system is proposed according to an embodiment of the present invention, comprising: a first switching unit, a switching unit, a first voltage detection device, and an insulation resistance testing device; the first voltage detection device and the insulation resistance testing device are respectively connected in parallel with the relay under test; the switching unit is coupled to the relay under test, the first voltage detection device, and the insulation resistance testing device, and the switching unit is used to switch between the first voltage detection device and the insulation resistance testing device, so that at any given time only one of them is conducting in parallel with the relay under test, and the other is disconnected in parallel with the relay under test; the first switching unit is coupled between the power supply and the relay under test, and the first switching unit is used to conduct when the first voltage detection device is connected in parallel with the relay under test, so that the power supply supplies power to the relay under test; wherein, the life of the relay under test is determined based on the voltage detected by the first voltage detection device and the insulation resistance detected by the insulation resistance testing device.

[0006] In the technical solution of this application embodiment, when performing voltage detection on the relay under test, the switching unit connects the first voltage detection device in parallel with the relay under test for voltage acquisition, and simultaneously disconnects the connection between the insulation resistance testing device and the relay under test, thus isolating the insulation resistance testing device from the main circuit to protect the insulation resistance testing device. When performing insulation resistance detection, the first switching unit cuts off the power supply, separating the relay under test from the power supply. This prevents the high voltage signal of the insulation resistance testing device from backflowing to the power supply. At the same time, the switching unit disconnects the connection between the first voltage detection device and the relay under test to reduce the interference of the first voltage detection device on the insulation resistance of the relay under test, thereby improving the detection accuracy.

[0007] According to one embodiment of the present invention, the switching unit includes a single-pole double-throw switch, the input terminal of which is coupled to the contact of the relay under test, the first output terminal of which is coupled to a first voltage detection device, and the second output terminal of which is coupled to an insulation resistance testing device.

[0008] In the technical solution of this application embodiment, by controlling the connection state between the input terminal of the single-pole double-throw switch and the first output terminal and the second output terminal, time-division detection of voltage detection and insulation detection is realized, which can reduce signal interference between different detection functions and thus improve detection accuracy.

[0009] According to one embodiment of the present invention, the switching unit includes: a first switch and a second switch; the first switch is coupled between the contacts of the relay under test and the first voltage detection device; the second switch is coupled between the contacts of the relay under test and the insulation resistance testing device.

[0010] In the technical solution of this application embodiment, the connection state between the voltage detection device and the relay under test is controlled by the first switch, and the connection state between the insulation resistance testing device and the relay under test is controlled by the second switch. This realizes time-division detection of voltage detection and insulation detection, and the two switches are independent of each other, which can reduce signal interference between different detection functions and thus improve detection accuracy.

[0011] According to one embodiment of the present invention, there are multiple first switches, wherein at least one first switch is coupled between one end of the contact of the relay under test and one end of the first voltage detection device, and at least one first switch is coupled between the other end of the contact of the relay under test and the other end of the first voltage detection device, and the multiple first switches coupled to the same end are connected in series or in parallel.

[0012] In the technical solution of this application embodiment, there can be multiple first switches. Multiple first switches are connected in series with the first voltage detection device and then connected in parallel with the contacts of the relay to be tested. When each first switch is closed, the voltage detection device is connected to both ends of the contact, thereby realizing accurate detection of the contact voltage of the relay to be tested.

[0013] According to one embodiment of the present invention, there are multiple second switches, wherein at least one second switch is coupled between one end of the contact of the relay under test and one end of the insulation resistance testing device, and at least one second switch is coupled between the other end of the contact of the relay under test and the other end of the insulation resistance testing device, and multiple second switches coupled to the same end are connected in series or in parallel.

[0014] In the technical solution of this application embodiment, there can be multiple second switches. Multiple second switches are connected in series with the insulation resistance testing device and then connected in parallel with the contacts of the relay under test. When each second switch is closed, the insulation resistance testing device is connected to both ends of the contact, thereby realizing accurate detection of the insulation resistance of the relay under test.

[0015] According to one embodiment of the present invention, when there are multiple relays under test, the relay life test system includes multiple switching units, each of which is coupled to a relay under test, a first voltage detection device, and an insulation resistance test device.

[0016] In the technical solution of this application embodiment, when there are multiple relays under test, each relay under test is provided with a corresponding switching unit. By controlling the switching unit, voltage detection and insulation resistance detection of each relay can be performed in time-sharing manner, thereby improving testing efficiency and meeting the needs of batch testing.

[0017] According to one embodiment of the present invention, the switching unit includes a third switch and a fourth switch; the third switch is coupled between the power supply and the first voltage detection device; the fourth switch is coupled between the contacts of the relay under test and the insulation resistance testing device.

[0018] In the technical solution of this application embodiment, the connection state between the voltage detection device and the relay under test is controlled by the third switch, and the connection state between the insulation resistance testing device and the relay under test is controlled by the fourth switch. This realizes time-division detection of voltage detection and insulation detection, and the two switches are independent of each other, which can reduce signal interference between different detection functions and thus improve detection accuracy.

[0019] According to one embodiment of the present invention, there are multiple third switches, wherein at least one third switch is coupled between the positive output terminal of the power supply and one end of the first voltage detection device, and at least one third switch is coupled between the negative output terminal of the power supply and the other end of the first voltage detection device, and multiple third switches coupled to the same end are connected in series or in parallel.

[0020] In the technical solution of this application embodiment, multiple third switches are connected in series with the first voltage detection device and then connected in parallel with the power supply. When the voltage of the relay under test is detected, the first switch unit is turned on. Similarly, multiple third switches, the first voltage detection device and the contacts of the relay under test can form a detection circuit, thereby realizing accurate detection of the contact voltage of the relay under test.

[0021] According to one embodiment of the present invention, there are multiple fourth switches, wherein at least one fourth switch is coupled between one end of the contact of the relay under test and one end of the insulation resistance testing device, and at least one fourth switch is coupled between the other end of the contact of the relay under test and the other end of the insulation resistance testing device, and multiple fourth switches coupled to the same end are connected in series or in parallel.

[0022] In the technical solution of this application embodiment, there can be multiple fourth switches. Multiple fourth switches are connected in series with the insulation resistance testing device and then connected in parallel with the contacts of the relay under test. When each fourth switch is closed, the insulation resistance testing device is connected to both ends of the contact, thereby realizing accurate detection of the insulation resistance of the relay under test.

[0023] According to one embodiment of the present invention, when there are multiple relays under test, there are multiple fourth switches, and each fourth switch is coupled between the contact of one relay under test and the insulation resistance testing device.

[0024] In the technical solution of this application embodiment, when there are multiple relays under test, each relay under test is provided with a corresponding fourth switch. By controlling the fourth switch, the insulation resistance of each relay under test can be detected in a time-division manner.

[0025] According to one embodiment of the present invention, when there are multiple relays under test, there are multiple fourth switches. At least one fourth switch is coupled between one end of the contact of each relay under test and one end of the insulation resistance testing device, and at least one fourth switch is coupled between the other end of the contact of each relay under test and the other end of the insulation resistance testing device. Multiple fourth switches coupled to the same end are connected in series or in parallel.

[0026] In the technical solution of this application embodiment, when there are multiple relays under test, each relay under test is provided with two fourth switches. By controlling the two fourth switches corresponding to each relay, the insulation resistance of each relay under test can also be detected in a time-division manner.

[0027] According to one embodiment of the present invention, when there are multiple relays under test, the relay life testing system includes multiple first switching units, each of which is coupled between a power supply and a relay under test.

[0028] In the technical solution of this application embodiment, when there are multiple relays under test, each relay under test is provided with a first switching unit. By controlling the first switching unit, the system can perform electrical life tests on other relays under test while one relay under test is idle, thereby improving testing efficiency and meeting the needs of batch testing.

[0029] According to one embodiment of the present invention, the relay life testing system further includes a second switching unit, one end of which is coupled between the power supply and the first switching unit. The closing time of the second switching unit is later than the closing time of the first switching unit, and the opening time of the second switching unit is earlier than the opening time of the first switching unit.

[0030] In the technical solution of this application embodiment, by setting a second switching unit connected in series with the first switching unit and controlling its closing time to be later than the first switching unit and its opening time to be earlier than the first switching unit, the surge current at the moment of power connection is reduced, thereby extending the service life of the contacts and improving the safety of the test. According to an embodiment of this utility model, the relay life test system further includes a control unit, which is coupled to a first voltage detection device and an insulation resistance test device. The control unit is used to determine the switching state of the relay under test based on the voltage value detected by the first voltage detection device, and to determine the insulation aging parameters of the relay under test based on the insulation resistance detected by the insulation resistance test device. Furthermore, if the switching state indicates that the relay under test is malfunctioning, and / or the insulation aging parameters are greater than or equal to preset aging parameters, the control unit determines that the relay under test has failed.

[0031] In the technical solution of this application embodiment, the control unit is connected to the first voltage detection device and the insulation resistance testing device, and can directly obtain the voltage value detected by the first voltage detection device and the insulation resistance detected by the insulation resistance testing device. Then, based on the voltage value detected by the first voltage detection device and the insulation resistance detected by the insulation resistance testing device, it is determined whether the relay under test has failed, thereby realizing the life test of the relay under test.

[0032] According to one embodiment of the present invention, the relay life testing system further includes a second voltage detection device, which is coupled to the coil and control unit of the relay under test. The second voltage detection device is used to detect the voltage of the coil of the relay under test to obtain the coil voltage signal and send the coil voltage signal to the control unit. When the control unit receives the coil voltage signal, it controls the first switching unit and the switching unit according to a preset action sequence.

[0033] In the technical solution of this application embodiment, the second voltage detection device detects the coil voltage signal, and the control unit uses the coil voltage signal as the trigger basis and controls the first switching unit and the switching unit to operate according to the preset action sequence, thereby realizing the automatic control of the system action sequence, so that the first switching unit and the switching unit can perform the corresponding on and off actions at the preset timing nodes, thereby improving the automation level and timing accuracy of the test.

[0034] According to one embodiment of the present invention, the relay life testing system further includes a data acquisition unit, which is coupled to a first voltage detection device, a second voltage detection device and a control unit. The data acquisition unit is used to acquire the voltage value detected by the first voltage detection device when a coil voltage signal is received, and to send the coil voltage signal and the voltage value detected by the first voltage detection device to the control unit.

[0035] In the technical solution of this application embodiment, the data acquisition unit synchronously acquires the contact voltage signal collected by the first voltage detection device under the trigger of the coil voltage signal, and sends the coil voltage signal and the contact voltage signal to the control unit, thereby realizing the synchronous acquisition and recording of multi-dimensional electrical signals during the test, thereby improving the consistency of data acquisition and providing a reliable data foundation for subsequent relay life analysis and performance evaluation.

[0036] According to one embodiment of the present invention, the relay life testing system further includes an alarm unit coupled to the control unit. The alarm unit is used to issue an alarm message upon receiving an alarm command from the control unit. The control unit generates an alarm command when the insulation resistance collected by the insulation resistance testing device is less than or equal to a preset resistance threshold.

[0037] In the technical solution of this application embodiment, the control unit compares the insulation resistance with a preset resistance threshold. When the insulation resistance is less than or equal to the preset resistance threshold, the control unit promptly issues an alarm message, thereby providing timely warning of the degradation of the relay insulation performance and improving the reliability of the battery system.

[0038] Additional aspects and advantages of this invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0039] Figure 1 This is a schematic diagram of a relay life testing system according to an embodiment of the present invention; Figure 2 This is a schematic diagram of the structure of a first switching unit and a power supply according to an embodiment of the present invention; Figure 3 This is a schematic diagram of the structure of a switching unit according to an embodiment of the present invention; Figure 4 This is a schematic diagram of the switching unit according to another embodiment of the present invention; Figure 5 This is a schematic diagram showing that there are multiple first and second switches according to one embodiment of the present utility model; Figure 6 This is a schematic diagram showing that there are multiple first and second switches according to another embodiment of the present invention; Figure 7 This is a schematic diagram of the structure of multiple switching units when there are multiple relays under test according to an embodiment of the present invention; Figure 8 This is a schematic diagram of the structure of multiple switching units when there are multiple relays to be tested according to another embodiment of the present invention; Figure 9 This is a schematic diagram of the switching unit according to another embodiment of the present invention; Figure 10 This is a schematic diagram showing that there are multiple third and fourth switches according to one embodiment of the present invention; Figure 11 This is a schematic diagram of the structure of multiple fourth switches when there are multiple relays to be tested according to an embodiment of the present invention; Figure 12 This is a schematic diagram of the structure of multiple fourth switches when there are multiple relays to be tested according to another embodiment of the present invention; Figure 13 This is a schematic diagram of the structure of multiple fourth switches when there are multiple relays to be tested according to another embodiment of the present invention; Figure 14 This is a schematic diagram of the structure of multiple fourth switches when there are multiple relays to be tested according to another embodiment of the present invention; Figure 15 This is a schematic diagram of the structure of the second switching unit according to an embodiment of the present invention; Figure 16This is a schematic diagram of the structure of a control unit according to an embodiment of the present invention; Figure 17 This is a circuit diagram of the coil of a relay under test according to an embodiment of the present invention; Figure 18 This is a schematic diagram of a preset action sequence according to an embodiment of the present invention; Figure 19 This is a schematic diagram of the control unit according to another embodiment of the present invention; Figure 20 This is a schematic diagram of the structure of a data acquisition unit according to an embodiment of the present invention; Figure 21 This is a schematic diagram of the structure of an alarm unit according to an embodiment of the present invention. Detailed Implementation

[0040] The embodiments of this utility model are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain this utility model, and should not be construed as limiting this utility model.

[0041] The relay life testing system of this utility model is described below with reference to the accompanying drawings.

[0042] Figure 1 This is a schematic diagram of a relay life testing system according to an embodiment of the present invention. Figure 1 As shown, the relay life test system 100 includes: a first switching unit 10, a switching unit 20, a first voltage detection device 31, and an insulation resistance test device 40.

[0043] The first voltage detection device 31 and the insulation resistance testing device 40 are connected in parallel with the relay under test 200, respectively. The switching unit 20 is coupled to the relay under test 200, the first voltage detection device 31, and the insulation resistance testing device 40. The switching unit 20 is used to switch between the first voltage detection device 31 and the insulation resistance testing device 40, so that only one of them is conducting in parallel with the relay under test 200 at any given time, while the other is disconnected. The first switching unit 10 is coupled between the power supply 300 and the relay under test 200. The first switching unit 10 is used to conduct when the first voltage detection device 31 is connected in parallel with the relay under test 200, so that the power supply 300 supplies power to the relay under test 200. The lifespan of the relay under test is determined based on the voltage detected by the first voltage detection device 31 and the insulation resistance detected by the insulation resistance testing device 40.

[0044] Specifically, the first switching unit 10 is connected in series between the power supply 300 and the relay under test 200 to control the on / off state of the power supply 300. When voltage detection is required, the first switching unit 10 and the relay under test are closed, forming a current loop between the power supply 300 and the relay under test 200. At this time, the switching unit 20 switches the parallel connection between the first voltage detection device 31 and the relay under test 200 to a connected state, and simultaneously switches the parallel connection between the insulation resistance testing device 40 and the relay under test 200 to a disconnected state, so that the first voltage detection device 31 can detect the voltage of the relay under test 200.

[0045] When insulation resistance testing is required, the first switching unit 10 and the relay under test are disconnected to cut off the electrical connection between the relay under test 200 and the power supply 300, thus preventing the high-voltage signal from the insulation resistance testing device 40 from being input to the power supply 300. At this time, the switching unit 20 switches the parallel connection between the insulation resistance testing device 40 and the relay under test 200 to a connected state, and simultaneously switches the parallel connection between the first voltage detection device 31 and the relay under test 200 to a disconnected state, so that the insulation resistance testing device 40 can test the insulation resistance of the relay under test 200.

[0046] After the relay life test system 100 completes voltage detection and insulation resistance detection, it can determine whether the relay under test 200 has failed based on the voltage detected by the first voltage detection device 31 and the insulation resistance detected by the insulation resistance test device 40, thereby realizing the life test of the relay under test 200.

[0047] In one alternative implementation, such as Figure 2 As shown, the first switching unit 10 includes a fifth switch K5 and a sixth switch K6. The fifth switch K5 is coupled between the positive output terminal of the power supply 300 and one end of the relay under test 200, and the sixth switch K6 is coupled between the negative output terminal of the power supply 300 and the other end of the relay under test 200. The power supply 300 includes a DC power supply 301 and a load 302. The positive output terminal of the DC power supply 301 is connected to one end of the fifth switch K5, the negative terminal of the DC power supply 301 is connected to one end of the load 302, and the other end of the load 302 is connected to one end of the sixth switch K6. When the first switching unit 10 is closed, the fifth switch K5 and the sixth switch K6 are closed simultaneously. The current output by the DC power supply 301 flows through the fifth switch K5, the relay under test 200, the sixth switch K6, and the load 302, and then flows back to the negative terminal of the DC power supply 301, thus forming a current loop.

[0048] In the above embodiments, during voltage detection, the switching unit connects the first voltage detection device in parallel with the relay under test to acquire the voltage of the relay under test, while simultaneously disconnecting the insulation resistance testing device from the relay under test, thus isolating the insulation resistance testing device from the main circuit and protecting it. During insulation resistance detection, the first switching unit cuts off the power supply, separating the relay under test from the power supply. This prevents the high-voltage signal from the insulation resistance testing device from backflowing into the power supply. Simultaneously, the switching unit disconnects the parallel connection between the first voltage detection device and the relay under test, reducing interference from the first voltage detection device on the insulation resistance of the relay under test, thereby improving detection accuracy. Therefore, through the coordinated operation of the first switching unit and the switching unit, time-division measurement of voltage and insulation resistance is achieved, enabling automatic detection of insulation resistance values ​​during electrical life testing, improving detection efficiency, and providing accurate data support for electrical life failure determination.

[0049] In some embodiments, such as Figure 3 As shown, the switching unit 20 includes a single-pole double-throw switch (SPDT). The input terminal of the SPDT is coupled to the contact K of the relay under test. The first output terminal of the SPDT is coupled to the first voltage detection device 31. The second output terminal of the SPDT is coupled to the insulation resistance testing device 40.

[0050] Understandably, when the input terminal of the single-pole double-throw switch (SPDT) is connected to the first output terminal of the SPDT, the contact K of the relay under test is connected in parallel with the first voltage detection device 31. At this time, the input terminal of the SPDT is disconnected from the second output terminal of the SPDT, so the parallel connection between the contact K of the relay under test and the insulation resistance testing device 40 is broken. When the input terminal of the SPDT is connected to the second output terminal of the SPDT, the contact K of the relay under test is connected in parallel with the insulation resistance testing device 40. At this time, the input terminal of the SPDT is disconnected from the first output terminal of the SPDT, so the parallel connection between the contact K of the relay under test and the first voltage detection device 31 is broken.

[0051] In the technical solution of this application embodiment, by controlling the connection state between the input terminal of the single-pole double-throw switch and the first output terminal and the second output terminal, time-division detection of voltage detection and insulation detection is realized, which can reduce signal interference between different detection functions and thus improve detection accuracy.

[0052] In some embodiments, such as Figure 4As shown, the switching unit 20 includes: a first switch K1 and a second switch K2; the first switch K1 is coupled between the contact K of the relay under test and the first voltage detection device 31; the second switch K2 is coupled between the contact K of the relay under test and the insulation resistance testing device 40.

[0053] In other words, when performing contact voltage detection, the first switch K1 connects the first voltage detection device 31 and the contact K of the relay under test in parallel, while the second switch K2 disconnects the insulation resistance testing device 40 from the contact K of the relay under test in parallel; when performing insulation resistance detection, the second switch K2 connects the insulation resistance testing device 40 and the contact K of the relay under test in parallel, while the first switch K1 disconnects the first voltage detection device 31 from the contact K of the relay under test in parallel.

[0054] In the technical solution of this application embodiment, the connection state between the voltage detection device and the relay under test is controlled by the first switch, and the connection state between the insulation resistance testing device and the relay under test is controlled by the second switch. This realizes time-division detection of voltage detection and insulation detection, and the two switches are independent of each other, which can reduce signal interference between different detection functions and thus improve detection accuracy.

[0055] In some embodiments, there are multiple first switches, wherein at least one first switch is coupled between one end of the contact K of the relay under test and one end of the first voltage detection device 31, and at least one first switch is coupled between the other end of the contact K of the relay under test and the other end of the first voltage detection device 31, and multiple first switches coupled to the same end are connected in series or in parallel.

[0056] by Figure 5 Taking the example shown, there are two first switches, namely the first switch K11 and the second switch K12. The first switch K11 is coupled between one end of the contact K of the relay under test and one end of the first voltage detection device 31, and the second switch K12 is coupled between the other end of the contact K of the relay under test and the other end of the first voltage detection device 31. The first switch K11 and the second switch K12 operate synchronously. When the first switch K11 and the second switch K12 are closed at the same time, the parallel connection between the first voltage detection device 31 and the contact K of the relay under test is connected. When the first switch K11 and the second switch K12 are opened at the same time, the parallel connection between the first voltage detection device 31 and the contact K of the relay under test is broken.

[0057] It should be noted that, Figure 5 The first switch K11 and the second switch K12 shown are merely illustrative. In practical applications, the number of first switches is not limited to two; other numbers are also possible, and no specific limitation is made here. For example, such as... Figure 6 As shown, when there are three first switches, one end of the first voltage detection device 31 can be equipped with a first first switch K11 and a second first switch K12, which are connected in series. The other end of the first voltage detection device 31 can be equipped with a third first switch K13. When there are multiple first switches on the same end, the multiple first switches can also be connected in parallel.

[0058] In the technical solution of this application embodiment, there can be multiple first switches. Multiple first switches are connected in series with the first voltage detection device and then connected in parallel with the contacts of the relay to be tested. When each first switch is closed, the voltage detection device is connected to both ends of the contact, thereby realizing accurate detection of the contact voltage of the relay to be tested.

[0059] In some embodiments, there are multiple second switches, wherein at least one second switch is coupled between one end of the contact K of the relay under test and one end of the insulation resistance testing device 40, and at least one second switch is coupled between the other end of the contact K of the relay under test and the other end of the insulation resistance testing device 40, and multiple second switches coupled to the same end are connected in series or in parallel.

[0060] Please continue to refer to this. Figure 5 There are two second switches, namely, a first second switch K21 and a second second switch K22. The first second switch K21 is coupled between one end of the contact K of the relay under test and one end of the insulation resistance testing device 40, and the second second switch K22 is coupled between the other end of the contact K of the relay under test and the other end of the insulation resistance testing device 40. The first second switch K21 and the second second switch K22 operate synchronously. When the first second switch K21 and the second second switch K22 are closed at the same time, the parallel connection between the insulation resistance testing device 40 and the contact K of the relay under test is connected. When the first second switch K21 and the second second switch K22 are opened at the same time, the parallel connection between the insulation resistance testing device 40 and the contact K of the relay under test is broken.

[0061] Similarly, Figure 5 The first and second switches K21 and K22 shown are merely examples, and the number of second switches is not limited to two. Figure 6 As shown, one end of the insulation resistance testing device 40 can be equipped with a first second switch K21 and a second second switch K22, which are connected in series. The other end of the insulation resistance testing device 40 can be equipped with a third second switch K23. When there are multiple second switches on the same end, the multiple second switches can also be connected in parallel.

[0062] In the technical solution of this application embodiment, there can be multiple second switches. Multiple second switches are connected in series with the insulation resistance testing device and then connected in parallel with the contacts of the relay under test. When each second switch is closed, the insulation resistance testing device is connected to both ends of the contact, thereby realizing accurate detection of the insulation resistance of the relay under test.

[0063] In some embodiments, such as Figure 7 As shown, when there are multiple relays 200 under test, the relay life test system 100 includes multiple switching units 20, each switching unit 20 being coupled to one relay 200 under test, a first voltage detection device 31, and an insulation resistance test device 40.

[0064] Specifically, when there are multiple relays under test 200, each relay under test 200 is provided with a corresponding switching unit 20. By controlling the operation of the switching unit 20, it is possible to perform insulation resistance detection on another relay under test while performing voltage detection on one relay under test.

[0065] by Figure 8 Taking the example shown, multiple relays under test include a first relay under test 201, a second relay under test 202, ..., an nth relay under test 20n, and multiple switching units include a first switching unit 21, a second switching unit 22, ..., an nth switching unit 2n. When the voltage of the first relay under test 201 is detected, the first switching unit 21 can connect the first voltage detection device 31 in parallel with the first relay under test 201. At this time, the insulation resistance of the second relay under test 202 can be detected. The second switching unit 22 can connect the insulation resistance testing device 40 in parallel with the second relay under test 202, thereby realizing the insulation resistance detection of the second relay under test 202 while the voltage of the first relay under test 201 is detected.

[0066] In the technical solution of this application embodiment, when there are multiple relays under test, each relay under test is provided with a corresponding switching unit. By controlling the switching unit, voltage detection and insulation resistance detection of each relay can be performed in time-sharing manner, thereby improving testing efficiency and meeting the needs of batch testing.

[0067] In some embodiments, such as Figure 9 As shown, the switching unit 20 includes a third switch K3 and a fourth switch K4; the third switch K3 is coupled between the power supply 300 and the first voltage detection device 31; the fourth switch K4 is coupled between the contact K of the relay under test and the insulation resistance testing device 40.

[0068] Specifically, the switching unit 20 is not limited to Figure 4 The structure shown can also be adopted Figure 9The structure is shown. During voltage detection, the first switching unit 10 is turned on, and simultaneously the third switch K3 is turned on. At this time, the first voltage detection device 31 can also be connected in parallel with the contact K of the relay under test. During insulation resistance detection, the fourth switch K4 connects the insulation resistance testing device 40 in parallel with the contact K of the relay under test.

[0069] In the technical solution of this application embodiment, the connection state between the voltage detection device and the relay under test is controlled by the third switch, and the connection state between the insulation resistance testing device and the relay under test is controlled by the fourth switch. This realizes time-division detection of voltage detection and insulation detection, and the two switches are independent of each other, which can reduce signal interference between different detection functions and thus improve detection accuracy.

[0070] In some embodiments, there are multiple third switches, wherein at least one third switch is coupled between the positive output terminal of the power supply 300 and one end of the first voltage detection device 31, and at least one third switch is coupled between the negative output terminal of the power supply 300 and the other end of the first voltage detection device 31, and multiple third switches coupled to the same end are connected in series or in parallel.

[0071] by Figure 10 Taking the example shown, there are two third switches: a first third switch K31 and a second third switch K32. The first third switch K31 is coupled between the positive output terminal of the power supply 300 and one end of the first voltage detection device 31, and the second third switch K32 is coupled between the negative output terminal of the power supply 300 and the other end of the first voltage detection device 31. The first third switch K31 and the second third switch K32 operate synchronously. When the first third switch K31 and the second third switch K32 are closed simultaneously, the first switch unit 10 is turned on, and the parallel connection between the first voltage detection device 31 and the contact K of the relay under test is turned on. When the first third switch K31 and the second third switch K32 are opened simultaneously, the parallel connection between the first voltage detection device 31 and the contact K of the relay under test is opened.

[0072] In the technical solution of this application embodiment, multiple third switches are connected in series with the first voltage detection device and then connected in parallel with the power supply. When the voltage of the relay under test is detected, the first switch unit is turned on. Similarly, multiple third switches, the first voltage detection device and the contacts of the relay under test can form a detection circuit, thereby realizing accurate detection of the contact voltage of the relay under test.

[0073] In some embodiments, there are multiple fourth switches, wherein at least one fourth switch is coupled between one end of the contact K of the relay under test and one end of the insulation resistance testing device 40, and at least one fourth switch is coupled between the other end of the contact K of the relay under test and the other end of the insulation resistance testing device 40, and multiple fourth switches coupled to the same end are connected in series or in parallel.

[0074] Please continue to refer to this. Figure 10 There are two fourth switches: a first fourth switch K41 and a second fourth switch K42. The first fourth switch K41 is coupled between one end of the contact K of the relay under test and one end of the insulation resistance testing device 40. The second fourth switch K42 is coupled between the other end of the contact K of the relay under test and the other end of the insulation resistance testing device 40. The first fourth switch K41 and the second fourth switch K42 operate synchronously. When both switches K41 and K42 are closed simultaneously, the parallel connection between the insulation resistance testing device 40 and the contact K of the relay under test is established. When both switches K41 and K42 are opened simultaneously, the parallel connection between the insulation resistance testing device 40 and the contact K of the relay under test is broken.

[0075] Similarly, Figure 10 The first and second third switches K31 and the first and second fourth switches K41 and K42 shown are merely examples, and the number of third and fourth switches is not limited to two.

[0076] In the technical solution of this application embodiment, there can be multiple fourth switches. Multiple fourth switches are connected in series with the insulation resistance testing device and then connected in parallel with the contacts of the relay under test. When each fourth switch is closed, the insulation resistance testing device is connected to both ends of the contact, thereby realizing accurate detection of the insulation resistance of the relay under test.

[0077] In some embodiments, such as Figure 11 As shown, when there are multiple relays 200 under test, there are multiple fourth switches K4, and each fourth switch K4 is coupled between the contact K of one relay under test and the insulation resistance testing device 40.

[0078] Specifically, when there are multiple relays under test, each relay under test has a corresponding fourth switch K4 for its contact K. By controlling the third switch K3 and the fourth switch K4, it is possible to perform insulation resistance testing on one relay under test while performing voltage testing on another relay under test.

[0079] by Figure 12Taking multiple relay contacts and multiple fourth switches as an example, the relay contacts include a first contact Ks1, a second contact Ks2, ..., an nth contact Ksn, and the fourth switches include a first fourth switch K41, a second fourth switch K42, ..., an nth fourth switch K4n. When voltage detection is performed on any relay contact, the corresponding first switch unit is on, so the first voltage detection device 31 can form a voltage detection circuit through the third switch K3. When voltage detection is performed on the first contact Ks1, the third switch K3 is turned on to connect the first voltage detection device 31 in parallel with the first contact Ks1. At this time, insulation resistance detection can be performed on the second contact Ks2. The second fourth switch K42 connects the insulation resistance testing device 40 in parallel with the second contact Ks2, thus realizing insulation resistance detection on the second contact Ks2 while voltage detection is performed on the first contact Ks1.

[0080] In the technical solution of this application embodiment, when there are multiple relays under test, each relay under test is provided with a corresponding fourth switch. By controlling the fourth switch, the insulation resistance of each relay under test can be detected in a time-division manner.

[0081] In some embodiments, when there are multiple relays 200 under test, there are multiple fourth switches. At least one fourth switch is coupled between one end of the contact of each relay under test and one end of the insulation resistance testing device 40, and at least one fourth switch is coupled between the other end of the contact of each relay under test and the other end of the insulation resistance testing device 40. Multiple fourth switches coupled to the same end are connected in series or in parallel.

[0082] Each contact of the relay under test is equipped with two fourth switches, and the two fourth switches corresponding to each contact of the relay under test operate simultaneously. Figure 13 Taking the multiple relay contacts and multiple fourth switches shown as an example, the multiple relay contacts include a first contact Ks1, a second contact Ks2, ..., an nth contact Ksn, and the multiple fourth switches include a first fourth switch K41, a second fourth switch K42, a third fourth switch K43, a fourth fourth switch K44, ..., a 2n-1th fourth switch K4(2n-1) and a 2nth fourth switch K4(2n). When the voltage of the first contact Ks1 is detected, the first third switch K31 and the second third switch K32 are turned on to connect the first voltage detection device 31 in parallel with the first contact Ks1. At this time, the insulation resistance of the second contact Ks2 can be detected. The third fourth switch K43 and the fourth fourth switch K44 connect the insulation resistance testing device 40 in parallel with the second contact Ks2.

[0083] It should be noted that each relay is not limited to the following settings: Figure 13 The two fourth switches shown can be used to set other numbers of fourth switches; no specific limit is set here. For example, using... Figure 14 Taking the multiple relay contacts and multiple fourth switches shown as an example, the multiple fourth switches include the first fourth switch K41, the second fourth switch K42, the third fourth switch K43, the fourth fourth switch K44, the fifth fourth switch K45, the sixth fourth switch K46, ..., the 3n-2 fourth switch K4(3n-2), the 3n-1 fourth switch K4(3n-1), and the 3n fourth switch K4(3n). When the voltage of the first contact Ks1 under test is detected, the first third switch K31 and the second third switch K32 are turned on to connect the first voltage detection device 31 in parallel with the first contact Ks1 under test. At this time, the insulation resistance of the second contact Ks2 under test can be detected. The fourth fourth switch K44, the fifth fourth switch K45, and the sixth fourth switch K46 connect the insulation resistance testing device 40 in parallel with the second contact Ks2 under test.

[0084] In the technical solution of this application embodiment, when there are multiple relays under test, each relay under test is provided with two fourth switches. By controlling the two fourth switches corresponding to each relay, the insulation resistance of each relay under test can also be detected in a time-division manner.

[0085] In some embodiments, when there are multiple relays 200 under test, the relay life testing system 100 includes multiple first switching units 10, each first switching unit 10 being coupled between a power supply 300 and a relay 200 under test.

[0086] In practical applications, after a relay under test completes voltage detection, arcing may occur when the relay contacts break. Therefore, the relay under test needs to be left to stand for a period of time before insulation resistance detection can be performed to improve detection accuracy. During the standing period of the relay under test, the voltage of other relays under test can be detected by controlling the closing of the first switching unit 10 corresponding to other relays under test.

[0087] by Figures 12 to 14Taking the example shown, when there are multiple relays under test, there are multiple fifth switches and multiple sixth switches. The multiple fifth switches include a first fifth switch K51, a second fifth switch K52, ..., an nth fifth switch K5n, and the multiple sixth switches include a first sixth switch K61, a second sixth switch K62, ..., an nth sixth switch K6n. One end of each fifth switch is connected to the positive terminal of the DC power supply 301, and the other end of each fifth switch is connected to one end of a contact of a relay under test. One end of each sixth switch is connected to the other end of the load 302, and the other end of each sixth switch is connected to the other end of a contact of a relay under test. For example, suppose the contact voltage of the first contact Ks1 under test is detected first. Then, the first and fifth switches K51 and the first and sixth switches K61 corresponding to the first contact Ks1 will close. After the contact voltage detection of the first contact Ks1 is completed, the first and fifth switches K51 and the first and sixth switches K61 corresponding to the first contact Ks1 will open. Suppose the contact voltage of the second contact Ks2 under test is detected during the resting period of the first contact Ks1. Then, the second and fifth switches K52 and the second and sixth switches K62 corresponding to the second contact Ks2 will close. And so on, other relays under test can be tested during the resting period of each relay under test.

[0088] In the technical solution of this application embodiment, when there are multiple relays under test, each relay under test is provided with a first switching unit. By controlling the first switching unit, the system can perform electrical life tests on other relays under test while one relay under test is idle, thereby improving testing efficiency and meeting the needs of batch testing.

[0089] In some embodiments, such as Figure 15 As shown, the relay life test system 100 also includes a second switching unit 50, which is coupled between the power supply 300 and one end of the first switching unit 10. The closing time of the second switching unit 50 is later than the closing time of the first switching unit 10, and the opening time of the second switching unit 50 is earlier than the opening time of the first switching unit 10.

[0090] In practical applications, the voltage amplitude of power supply 300 is usually large. If power supply 300 is directly applied to the main circuit, the first switching unit 10 and the relay under test 200 in the main circuit will be subjected to a large current surge, which may damage the relay contacts. Therefore, in this embodiment, a second switching unit 50 is connected in series between power supply 300 and the first switching unit 10. By controlling the operating timing of the second switching unit 50, the current surge experienced by the first switching unit 10 and the relay under test 200 is reduced. It should be noted that the position of the second switching unit 50 is not limited to after the first switching unit 10; it can also be before the first switching unit 10.

[0091] Specifically, during contact voltage detection, the fifth switch K5 and the sixth switch K6 are first closed, simultaneously energizing the coil KA of the relay under test 200 to close its contact K. After both the first switch unit 10 and the relay under test 200 are closed, the second switch unit 50 is closed, i.e., the closure of the second switch unit 50 is delayed for a period of time. At this point, since the first switch unit 10 and the relay under test 200 are already closed, a current path has been formed in the main circuit, and there is no obstruction to the current. Therefore, when the second switch unit 50 closes, the current surge experienced by the first switch unit 10 and the relay under test 200 is relatively small. At the end of the contact voltage detection, the second switch unit 50 is first opened to disconnect the main circuit, eliminating current in the main circuit. Then, the fifth switch K5 and the sixth switch K6 are opened, thereby reducing the large current surge generated at the moment of contact disconnection.

[0092] In one optional embodiment, the second switching unit 50 includes at least one seventh switch K7, wherein the seventh switch K7 can be a power semiconductor device or a relay, such as a MOS (Metal Oxide Semiconductor Field Effect Transistor) or an IGBT (Insulated-Gate Bipolar Transistor). When there are multiple seventh switches K7, the multiple seventh switches K7 are connected in parallel and operate synchronously.

[0093] In the technical solution of this application embodiment, by setting a second switching unit connected in series with the first switching unit, and controlling its closing time to be later than the first switching unit and its opening time to be earlier than the first switching unit, the surge current at the moment of power connection is reduced, thereby extending the service life of the contacts and improving the safety of the test.

[0094] In some embodiments, such as Figure 16 As shown, the relay life testing system 100 also includes a control unit 60, which is coupled to the first voltage detection device 31 and the insulation resistance testing device 40. The control unit 60 is used to determine the switching state of the relay under test 200 based on the voltage value detected by the first voltage detection device 31, and to determine the insulation aging parameters of the relay under test 200 based on the insulation resistance detected by the insulation resistance testing device 40. In the event that the relay under test 200 is found to be malfunctioning based on the switching state, and / or the insulation aging parameters are greater than or equal to the preset aging parameters, the relay under test 200 is determined to be faulty.

[0095] The control unit 60 determines the switching state of the relay under test 200 based on the voltage value detected by the first voltage detection device 31 to determine whether there is any abnormal operation. Specifically, during voltage detection, the relay under test 200 should be in the on state, at which time the voltage value detected by the first voltage detection device 31 is at a low level. If the voltage value detected by the first voltage detection device 31 is high, the control unit 60 determines that the switching state is off, thereby determining that the relay under test 200 has malfunctioned, and thus determining that the relay under test 200 has failed.

[0096] The control unit 60 can calculate the insulation aging parameters of the relay under test 200 based on the insulation resistance. The insulation resistance value is negatively correlated with the insulation aging parameter; the higher the insulation resistance value, the more severe the aging of the relay under test 200, and the higher the insulation aging parameter. When the insulation aging parameter is greater than or equal to the preset aging parameter, the control unit 60 determines that the relay under test 200 has failed.

[0097] In the technical solution of this application embodiment, the control unit is connected to the first voltage detection device and the insulation resistance testing device, and can directly obtain the voltage value detected by the first voltage detection device and the insulation resistance detected by the insulation resistance testing device. Then, based on the voltage value detected by the first voltage detection device and the insulation resistance detected by the insulation resistance testing device, it is determined whether the relay under test has failed, thereby realizing the life test of the relay under test.

[0098] In some embodiments, the relay life testing system 100 further includes a second voltage detection device 32, which is coupled to the coil KA of the relay under test and the control unit 60. The second voltage detection device 32 is used to detect the voltage of the coil KA of the relay under test to obtain the coil voltage signal and send the coil voltage signal to the control unit 60. When the control unit 60 receives the coil voltage signal, it controls the first switching unit 10 and the switching unit 20 according to a preset action sequence.

[0099] Figure 17 A circuit diagram of the coil KA of a relay under test is shown. A second voltage detection device 32 is connected in parallel with the coil KA of the relay under test to detect the voltage of the coil KA and obtain the coil voltage signal. When performing contact voltage detection, the coil KA of the relay under test needs to be energized; when performing insulation detection, the coil KA of the relay under test needs to be de-energized. Therefore, the coil voltage signal can be used as a reference to control the first switching unit 10, the second switching unit 50, and the switching unit 20 according to a preset operating sequence.

[0100] by Figure 18Taking the preset action sequence as an example, firstly, the control unit 60 simultaneously controls the first switch K1, the second switch K2, the fifth switch K5 and the sixth switch K6 to close, and simultaneously controls the coil of the relay to be energized. The second voltage detection device 32 detects the coil voltage signal and simultaneously inputs the coil voltage signal to the control unit 60. When triggered by the coil voltage signal, the control unit 60 starts timing and controls the first switch K1 to the seventh switch K7 according to the preset action sequence (T1, T2, T3, T4, T5, T6). When the timing reaches T1, the control unit 60 controls the seventh switch K7 to close, and the first voltage detection device 31 begins to collect the contact voltage signal; when the timing reaches T2, the contact voltage detection is completed, and the control unit 60 controls the coil KA of the relay under test 200 to be de-energized; when the timing reaches T3, the control unit 60 controls the first switch K1, the second switch K2, and the seventh switch K7 to open; when the timing reaches T4, the control unit 60 controls the fifth switch K5 and the sixth switch K6 to open; after a preset resting time, when the timing reaches T5, the control unit 60 controls the fifth switch K5 and the sixth switch K6 to close, and the insulation resistance testing device 40 is connected to both ends of the contact to perform insulation resistance detection; when the timing reaches T6, the control unit 60 controls the fifth switch K5 and the sixth switch K6 to open.

[0101] In one alternative implementation, such as Figure 19 As shown, the control unit 60 includes a control module 61 and a drive module 62. The input terminal of the control module 61 is coupled to the output terminal of the second voltage detection device 32, and the output terminal of the control module 61 is coupled to the input terminal of the drive module 62. The output terminal of the drive module 62 is coupled to each switch and the relay under test 200. The drive module 62 may include an isolation communication module (not shown), such as an optocoupler. The control module 61 controls the state of each switch and the relay under test 200 in isolation through the isolation communication module, thereby improving the system's safety. When the control module 61 receives a coil voltage signal at its first input terminal, the control module 61 outputs a control signal to the drive module 62 according to a preset action sequence, so that the drive module 62 controls whether each switch and the relay under test 200 are energized, thereby controlling the on and off states of each switch and the relay under test 200.

[0102] In the technical solution of this application embodiment, the second voltage detection device detects the coil voltage signal, and the control unit uses the coil voltage signal as the trigger basis and controls the first switching unit and the switching unit to operate according to the preset action sequence, thereby realizing the automatic control of the system action sequence, so that the first switching unit and the switching unit can perform the corresponding on and off actions at the preset timing nodes, thereby improving the automation level and timing accuracy of the test.

[0103] In some embodiments, such as Figure 20 As shown, the relay life test system 100 also includes a data acquisition unit 70. The data acquisition unit 70 is coupled to the first voltage detection device 31, the second voltage detection device 32 and the control unit 60. The data acquisition unit 70 is used to acquire the voltage value detected by the first voltage detection device 31 when it receives the coil voltage signal, and send the coil voltage signal and the voltage value detected by the first voltage detection device 31 to the control unit 60.

[0104] In other words, the coil voltage signal can be used not only to trigger the control unit 60 to control the first switch K1 to the seventh switch K7, but also to trigger the data acquisition unit 70 to acquire data. When the external trigger port of the data acquisition unit 70 is triggered by the coil voltage signal, the data acquisition unit 70 begins to acquire the voltage signals detected by the first voltage detection device 31 and the second voltage detection device 32.

[0105] In one alternative implementation, such as Figure 15 , Figure 17 and Figure 20 As shown, the relay life testing system 100 also includes a first current detection device 33 and a second current detection device 34. The first current detection device 33 can be connected in series with the contact K of the relay under test and is used to detect the current at the contact K. The second current detection device 34 can be connected in series with the coil KA of the relay under test and is used to detect the current at the coil KA. The data acquisition unit 70 is also coupled to the first current detection device 33 and the second current detection device 34. When triggered by the coil voltage signal, the data acquisition unit 70 will simultaneously acquire the contact current collected by the first current detection device 33 and the coil current collected by the second current detection device 34, and send the contact current and coil current to the control unit 60.

[0106] In another optional implementation, the control unit 60 further includes a host computer 63. The data acquisition unit 70 can communicate with the host computer 63 to send the acquired coil voltage signal, contact voltage signal, contact current and coil current to the host computer 63 so that the host computer 63 can display the coil voltage signal, contact voltage signal, contact current and coil current, thereby facilitating the user to observe the actual situation of the relay 200 under test.

[0107] In the technical solution of this application embodiment, the data acquisition unit synchronously acquires the contact voltage signal collected by the first voltage detection device under the trigger of the coil voltage signal, and sends the coil voltage signal and the contact voltage signal to the control unit, thereby realizing the synchronous acquisition and recording of multi-dimensional electrical signals during the test, thereby improving the consistency of data acquisition and providing a reliable data foundation for subsequent relay life analysis and performance evaluation.

[0108] In some embodiments, the relay life testing system 100 further includes an alarm unit 80, which is coupled to the control unit 60. The alarm unit 80 is used to issue an alarm message when it receives an alarm command sent by the control unit 60. The control unit 60 generates an alarm command when the insulation resistance collected by the insulation resistance testing device 40 is less than or equal to a preset resistance threshold.

[0109] Please refer to Figure 21 The host computer 63 is directly connected to the insulation resistance testing device 40 and is used to control whether the insulation resistance testing device 40 samples the insulation resistance of the relay 200 under test. Figure 16 Taking the preset action sequence as an example, the host computer 63 can control the insulation resistance testing device 40 to sample the insulation resistance of the relay under test 200 between T5 and T6. Then, the insulation resistance sampled by the insulation resistance testing device 40 is compared with a preset resistance threshold. If the insulation resistance is less than or equal to the preset resistance threshold, an alarm command can be sent to the alarm unit 80 through the control module 61, causing the alarm unit 80 to issue an alarm message. After the alarm unit 80 issues the alarm message, the electrical life test of the relay under test 200 ends. If the insulation resistance is greater than the preset resistance threshold, voltage detection and insulation detection of the relay under test 200 continue.

[0110] In the technical solution of this application embodiment, the control unit compares the insulation resistance with a preset resistance threshold. When the insulation resistance is less than or equal to the preset resistance threshold, the control unit promptly issues an alarm message, thereby providing timely warning of the degradation of the relay insulation performance and improving the reliability of the battery system.

[0111] In summary, according to the relay life testing system of this utility model embodiment, during contact voltage detection, the switching unit connects the first voltage detection device to the contact to collect the contact voltage, while simultaneously disconnecting the insulation resistance testing device from the contact, thus isolating the insulation resistance testing device from the main circuit and protecting it. During insulation resistance detection, the first switching unit cuts off the power supply, separating the contacts of the relay under test from the power supply. This prevents the high-voltage signal from the insulation resistance testing device from backflowing to the power supply. Simultaneously, the switching unit disconnects the first voltage detection device from the contact to reduce interference from the first voltage detection device on the insulation resistance of the contact, thereby improving detection accuracy. Therefore, through the coordinated operation of the first switching unit and the switching unit, time-division measurement of contact voltage and insulation resistance is achieved, enabling automatic detection of the insulation resistance value between contacts during electrical life testing, improving detection efficiency, and providing accurate data support for electrical life failure determination.

[0112] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0113] Furthermore, the terms "first," "second," etc., used in the embodiments of this utility model are for descriptive purposes only and should not be construed as indicating or implying relative importance, or implicitly specifying the number of technical features indicated in this embodiment. Therefore, features defined with terms such as "first" and "second" in the embodiments of this utility model can explicitly or implicitly indicate that the embodiment includes at least one of those features. In the description of this utility model, the word "multiple" means at least two or more, such as two, three, four, etc., unless otherwise explicitly specified in the embodiments.

[0114] In this utility model, unless otherwise explicitly specified or limited in the embodiments, the terms "installation," "connection," "joining," and "fixing" appearing in the embodiments should be interpreted broadly. For example, a connection can be a fixed connection, a detachable connection, or an integral part; it can also be a mechanical connection, an electrical connection, etc. Of course, it can also be a direct connection, or an indirect connection through an intermediate medium, or it can be the internal connection of two components, or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific implementation.

[0115] Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of the present invention.

Claims

1. A relay life testing system, characterized in that, include: The system comprises a first switching unit, a switching unit, a first voltage detection device, and an insulation resistance testing device. The first voltage detection device and the insulation resistance testing device are respectively connected in parallel with the relay under test; The switching unit is coupled to the relay under test, the first voltage detection device, and the insulation resistance testing device. The switching unit is used to switch between the first voltage detection device and the insulation resistance testing device so that at any given time, only one of them is connected in parallel with the relay under test and is conducting, while the other is disconnected from the relay under test. The first switching unit is coupled between the power supply and the relay under test. The first switching unit is used to turn on when the first voltage detection device is connected in parallel with the relay under test, so that the power supply supplies power to the relay under test. The lifespan of the relay under test is determined based on the voltage detected by the first voltage detection device and the insulation resistance detected by the insulation resistance testing device.

2. The relay life testing system according to claim 1, characterized in that, The switching unit includes a single-pole double-throw switch, the input terminal of which is coupled to the contact of the relay under test, the first output terminal of which is coupled to the first voltage detection device, and the second output terminal of which is coupled to the insulation resistance testing device.

3. The relay life testing system according to claim 1, characterized in that, The switching unit includes: a first switch and a second switch; The first switch is coupled between the contacts of the relay under test and the first voltage detection device; The second switch is coupled between the contacts of the relay under test and the insulation resistance testing device.

4. The relay life testing system according to claim 3, characterized in that, There are multiple first switches, wherein at least one first switch is coupled between one end of the contact of the relay under test and one end of the first voltage detection device, and at least one first switch is coupled between the other end of the contact of the relay under test and the other end of the first voltage detection device. Multiple first switches coupled to the same end are connected in series or in parallel.

5. The relay life testing system according to claim 3, characterized in that, There are multiple second switches, wherein at least one second switch is coupled between one end of the contact of the relay under test and one end of the insulation resistance testing device, and at least one second switch is coupled between the other end of the contact of the relay under test and the other end of the insulation resistance testing device. Multiple second switches coupled to the same end are connected in series or in parallel.

6. The relay life testing system according to claim 1, characterized in that, When there are multiple relays under test, the relay life test system includes multiple switching units, each of which is coupled to one relay under test, the first voltage detection device, and the insulation resistance test device.

7. The relay life testing system according to claim 1, characterized in that, The switching unit includes a third switch and a fourth switch; The third switch is coupled between the power supply and the first voltage detection device; The fourth switch is coupled between the contacts of the relay under test and the insulation resistance testing device.

8. The relay life testing system according to claim 7, characterized in that, There are multiple third switches, wherein at least one third switch is coupled between the positive output terminal of the power supply and one end of the first voltage detection device, and at least one third switch is coupled between the negative output terminal of the power supply and the other end of the first voltage detection device. Multiple third switches coupled to the same end are connected in series or in parallel.

9. The relay life testing system according to claim 7, characterized in that, There are multiple fourth switches, wherein at least one fourth switch is coupled between one end of the contact of the relay under test and one end of the insulation resistance testing device, and at least one fourth switch is coupled between the other end of the contact of the relay under test and the other end of the insulation resistance testing device. Multiple fourth switches coupled to the same end are connected in series or in parallel.

10. The relay life testing system according to claim 7, characterized in that, When there are multiple relays under test, there are multiple fourth switches, each of which is coupled between a contact of one of the relays under test and the insulation resistance testing device.

11. The relay life testing system according to claim 7, characterized in that, When there are multiple relays under test, there are multiple fourth switches. At least one fourth switch is coupled between one end of the contact of each relay under test and one end of the insulation resistance testing device, and at least one fourth switch is coupled between the other end of the contact of each relay under test and the other end of the insulation resistance testing device. Multiple fourth switches coupled to the same end are connected in series or in parallel.

12. The relay life testing system according to any one of claims 1-11, characterized in that, When there are multiple relays under test, the relay life testing system includes multiple first switching units, each of which is coupled between the power supply and one relay under test.

13. The relay life testing system according to any one of claims 1-11, characterized in that, The relay life testing system further includes a second switching unit, one end of which is coupled between the power supply and the first switching unit. The closing time of the second switching unit is later than the closing time of the first switching unit, and the opening time of the second switching unit is earlier than the opening time of the first switching unit.

14. The relay life testing system according to any one of claims 1-11, characterized in that, The relay life testing system further includes a control unit, which is coupled to the first voltage detection device and the insulation resistance testing device. The control unit is used to determine the switching state of the relay under test based on the voltage value detected by the first voltage detection device, and to determine the insulation aging parameter of the relay under test based on the insulation resistance detected by the insulation resistance testing device. Furthermore, if the switching state indicates that the relay under test is malfunctioning, and / or if the insulation aging parameter is greater than or equal to a preset aging parameter, the control unit determines that the relay under test has failed.

15. The relay life testing system according to claim 14, characterized in that, The relay life testing system further includes a second voltage detection device, which is coupled to the coil of the relay under test and the control unit. The second voltage detection device is used to detect the voltage of the coil of the relay under test to obtain a coil voltage signal and send the coil voltage signal to the control unit. When the control unit receives the coil voltage signal, it controls the first switching unit and the switching unit according to a preset action sequence.

16. The relay life testing system according to claim 15, characterized in that, The relay life testing system further includes a data acquisition unit, which is coupled to the first voltage detection device, the second voltage detection device, and the control unit. The data acquisition unit is used to acquire the voltage value detected by the first voltage detection device when the coil voltage signal is received, and to send the coil voltage signal and the voltage value detected by the first voltage detection device to the control unit.

17. The relay life testing system according to claim 14, characterized in that, The relay life testing system also includes an alarm unit coupled to the control unit. The alarm unit is used to issue an alarm message upon receiving an alarm command from the control unit. The control unit generates the alarm command when the insulation resistance collected by the insulation resistance testing device is less than or equal to a preset resistance threshold.

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