A general-purpose multi-channel relay switch contact rapid detection system and method

Abstract

The application discloses a universal multi-channel relay switch contact rapid detection system and method, which comprises a power supply module, a relay, a jitter detection module, a communication module and an upper computer monitoring module. The application realizes the conversion of the relay switch contact signal source by changing the relay power supply mode, utilizes the first optocoupler and the second optocoupler to form an interconnected optocoupler group, connects the first optocoupler and the second optocoupler as redundancy, and forms a pressure difference with equal size and opposite sign at both ends of the first optocoupler and the second optocoupler. In this way, no matter what type of active contact the relay is, it does not need to be identified in advance, and the rapid jitter detection of multiple contacts can be directly performed. Meanwhile, the method can accurately identify the signal source carried by the contact through one-time detection, is simple to operate, has strong universality for relay contact detection, has high test efficiency, can realize the rapid jitter detection of any signal source contact, and significantly improves the reliability and universality of the relay switch contact jitter detection.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of instrument measurement technology, in particular to a universal multi-channel relay switch contact rapid detection system and method. BACKGROUND

[0002] The power distribution instrument is widely used in aerospace military products, and its electrical performance directly determines the quality of the product. As an important part of the power distribution instrument, the reliability of the relay switch contact is an important guarantee for the normal operation of the military product. At present, there are many types of relays, and the probability of switch contact jitter failure is high during use. Therefore, how to implement rapid and effective jitter detection of relay switch contacts is of great significance to ensure the safe and reliable operation of relays. The existing relay switch contact jitter detection equipment is mostly civilian instrument, which has few loops, low detection accuracy, and complex operation, and is easily affected by the test environment, so the failure rate is high during use. At the same time, when the switch contact of the relay is an active contact, direct detection may cause product short circuit or jitter detection failure, so this kind of instrument generally needs to analyze the contact signal source in advance when detecting the relay, so the use of this kind of instrument to detect the relay will reduce the efficiency of the relay switch contact jitter detection, and the detection reliability is poor, which cannot meet the current military product rapid, large batch and high quality production requirements.

[0003] In the prior art, such as Chinese patent application No. CN201310580792.X discloses a mechanical switch contact jitter time measurement method and device, which first starts the jitter test software from the microcomputer for FPGA initialization, continuously samples the mechanical switch contact state value and accumulates the jitter time to send to the host computer for analysis and processing, thereby realizing mechanical switch contact jitter detection.

[0004] However, the measurement method used in the prior art has poor universality, complex operation, and can only realize the detection of passive contacts of mechanical switches. The detection of active contacts needs to be identified in advance, and the test efficiency is low. Therefore, this kind of method cannot realize the rapid jitter detection of multiple types of active contacts. Once the source signal of the contact is GND and the test is directly performed without prior identification, the relay jitter detection will be invalid or even directly damage the test product, which has certain defects. SUMMARY

[0005] The purpose of the present application is to provide a universal multi-channel relay switch contact rapid detection system and method to solve the problems mentioned in the background.

[0006] In order to achieve the above object, the solution of the present application is: a universal multi-channel relay switch contact rapid detection system, comprising a power supply module, a relay, a jitter detection module, a communication module and an upper computer monitoring module, wherein:

[0007] The power supply module is used for connecting the relay to be detected on the product line package, and the power supply mode of the power supply module is dual power supply; the power supply module is respectively provided with a positive terminal V+, a power supply negative terminal V- and a KGND terminal, the power supply positive terminal V+ in the power supply module is connected with the power supply input positive terminal of the relay, and the power supply negative terminal V- in the power supply module is connected with the power supply input negative terminal of the relay; the difference between the power supply positive terminal V+ and the power supply negative terminal V- in the power supply module is ΔV1, the difference between the power supply input positive terminal VCC and the power supply input negative terminal GND of the relay is ΔV, and ΔV1=ΔV;

[0008] The jitter detection module comprises a plurality of interconnected optocoupler groups and an FPGA module, the interconnected optocoupler group further comprises a first voltage dividing resistor, a first optocoupler, a second optocoupler, a second pull-up resistor and a third pull-up resistor connected with each other, and the FPGA module at least comprises a group of IN1 input terminal and GND terminal and IN2 input terminal and GND terminal, each group of interconnected optocoupler groups is connected with each group of IN1 input terminal and IN2 input terminal, and the FPGA module acquires the pulse value of the IN1 input terminal and the IN2 input terminal in real time;

[0009] The communication module is used for data transmission between the jitter detection module and the upper computer monitoring module;

[0010] The upper computer monitoring module is used for setting the pulse width threshold value and comparing the pulse value of the IN1 input terminal and the IN2 input terminal in real time, so as to determine the type and jitter condition of the signal source carried by each switch contact of the relay, and the upper computer monitoring module is also used for displaying and storing the detection data of the relay.

[0011] Further, when the pulse value of the IN1 input terminal and the pulse value of the IN2 input terminal are both less than the pulse width threshold value, it is determined that the contact of the relay does not occur jitter;

[0012] When the pulse value of the IN1 input terminal is greater than the pulse width threshold value, and the pulse value of the IN2 input terminal is less than the pulse width threshold value, it is determined that the contact of the relay occurs jitter, and the signal source carried by the contact is the power supply positive terminal when the product is normally working;

[0013] When the pulse value of the IN1 input terminal is less than the pulse width threshold value, and the pulse value of the IN2 input terminal is greater than the pulse width threshold value, it is determined that the contact of the relay occurs jitter, and the signal source carried by the contact is the power supply negative terminal when the product is normally working.

[0014] Furthermore, the interconnected optocoupler group consisting of the first voltage divider resistor, the first optocoupler, the second pull-up resistor, the second optocoupler, and the third pull-up resistor constitutes one channel. The interconnected optocoupler group can simultaneously measure more than or equal to 300 channels by expanding the number of groups at the IN input terminals of the FPGA module.

[0015] Furthermore, the tail end of the control section of the first optocoupler and the head end of the control section of the second optocoupler are at the same point and connected to the KGND terminal of the power supply module through a first voltage divider resistor; the head end of the control section of the first optocoupler and the tail end of the control section of the second optocoupler are at the same point and connected to the negative terminal of the relay contact to be tested on the product line package; the head end of the output section of the first optocoupler and the head end of the output section of the second optocoupler are respectively connected to a second pull-up resistor and a third pull-up resistor, and the head end and tail end of the output section of the first optocoupler are respectively connected to the IN1 input terminal and the DGND terminal of the FPGA module; the head end and tail end of the output section of the second optocoupler are respectively connected to the IN2 input terminal and the DGND terminal of the FPGA module.

[0016] Furthermore, the resistance values ​​of the first voltage divider resistor, the second pull-up resistor, and the third pull-up resistor are selected according to the signal carried by the relay contact to be tested on the product line package and the IO input level of the FPGA module, respectively.

[0017] A general-purpose method for rapid detection of multi-channel relay switch contacts includes the following steps:

[0018] S1. Change the power supply method; When performing jitter detection on the relay switch contacts to be tested on the product line package, change the original power supply method through the power supply module, so that the positive power supply terminal V+ in the power supply module is connected to the positive power supply input terminal of the relay, and the negative power supply terminal V- in the power supply module is connected to the power supply input GND terminal of the relay. Also, make the tail end of the control part of the first optocoupler and the head end of the control part of the second optocoupler common point and connected to the KGND terminal of the power supply module through the first voltage divider resistor; wherein, the difference ΔV1 between the positive power supply terminal V+ and the negative power supply terminal V- in the power supply module is equal to the difference ΔV between the positive power supply input terminal VCC and the negative power supply input terminal GND of the relay.

[0019] S2, Threshold parameter setting; Set the pulse width threshold of relay switch contact bounce detection signals IN1 and IN2 to μ;

[0020] S3. Start testing; The jitter detection module detects the jitter status of a certain switch contact of the relay in real time and transmits the pulse widths μ1 and μ2 of the switch contact jitter detection signals IN1 and IN2 to the host computer monitoring module for real-time display and storage via RS485 serial communication;

[0021] S4. Based on the jitter detection signal of the relay switch contact displayed by the upper computer monitoring module, evaluate the jitter status of the relay switch contact in real time; extract and compare the pulse width μ1 of the jitter detection signal IN1 and the pulse width μ2 of the jitter detection signal IN2 obtained simultaneously. When μ > μ1 and μ > μ2, it is determined that the relay contact has not jittered; when μ < μ1 and μ > μ2, it is indicated that the relay contact has jittered, and when the relay is working normally, the signal source of the contact is the positive terminal VCC of the power supply input of the relay; when μ > μ1 and μ < μ2, it is determined that the relay contact has jittered, and when the relay is working normally, the signal source of the contact is the negative terminal GND of the power supply input of the relay.

[0022] The advantages of this invention compared to the prior art are:

[0023] (1) This invention achieves the conversion of the signal source of the relay switch contact by changing the relay power supply method. It uses a first optocoupler and a second optocoupler to form an interconnected optocoupler group, and connects the first optocoupler and the second optocoupler redundantly to form a voltage difference of equal magnitude and opposite sign at both ends of the first optocoupler and the second optocoupler. In this way, no matter what type of active contact the relay is, there is no need to identify it in advance, and multi-contact rapid jitter detection can be performed directly. At the same time, this method can accurately identify the signal source of the contact in one test. The method is simple to operate, has strong versatility for relay contact detection, and has high testing efficiency. It can realize rapid jitter detection of any signal source contact, eliminate the drawbacks of using existing equipment for relay active switch contact jitter detection, greatly improve the efficiency of relay switch contact jitter detection, and significantly improve the reliability and versatility of relay switch contact jitter detection. Attached Figure Description

[0024] Figure 1 This is a system structure block diagram of the present invention;

[0025] Figure 2 This is a structural block diagram of the multi-channel jitter detection module of the present invention;

[0026] Figure 3 This is a schematic diagram comparing the structure of the system of the present invention with that of existing jitter detection systems;

[0027] Figure 4 This invention describes the signal source of the relay contacts under different power supply conditions.

[0028] Figure 5 This is a flowchart of the method of the present invention;

[0029] Figure 6 is a partial circuit schematic diagram of an embodiment of the present invention.

[0030] The attached diagram lists the components represented by each number as follows:

[0031] 1. Power supply module; 2. Relay; 3. Jitter detection module; 31. First voltage divider resistor; 32. First optocoupler; 33. Second optocoupler; 34. Second pull-up resistor; 35. Third pull-up resistor; 36. FPGA module; 4. Communication module; 5. Host computer monitoring module. Detailed Implementation

[0032] Embodiments of the present invention are described in detail below, examples of which are illustrated in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain the present invention, and should not be construed as limiting the present invention.

[0033] Example 1:

[0034] like Figure 1 As shown, a general-purpose multi-channel relay switch contact rapid detection system includes a power supply module 1, a relay 2, a jitter detection module 3, a communication module 4, and a host computer monitoring module 5, wherein:

[0035] The power supply module 1 is used to connect the relay 2 to be tested on the product line package. The power supply module 1 is powered by a dual power supply. The power supply module 1 is provided with a positive terminal V+, a negative terminal V-, and a GND terminal. The positive terminal V+ of the power supply module 1 is connected to the positive power input terminal of the relay 2, and the negative terminal V- of the power supply module 1 is connected to the negative power input terminal of the relay 2. The difference between the positive terminal V+ and the negative terminal V- of the power supply module 1 is ΔV1, and the difference between the positive power input terminal VCC and the negative power input terminal GND of the relay 2 is ΔV, where ΔV1 = ΔV.

[0036] The jitter detection module 3 includes several interconnected optocoupler groups and an FPGA module 36. Each interconnected optocoupler group further includes a first voltage divider resistor 31, a first optocoupler 32, a second optocoupler 33, a second pull-up resistor 34, and a third pull-up resistor 35 connected to each other. The FPGA module 36 includes at least one set of IN1 input terminals and a GND terminal, as well as an IN2 input terminal and a GND terminal. Each interconnected optocoupler group is connected to each set of IN1 and IN2 input terminals respectively. The FPGA module 36 acquires the pulse width values ​​of the IN1 and IN2 input terminals in real time. In this embodiment, the tail end of the control section of the first optocoupler 32 and the head end of the control section of the second optocoupler 33 are at the same point and connected to the KGND terminal of the power supply module 1 through the first voltage divider resistor 31. The control of the first optocoupler 32... The first end of the first optocoupler 32 and the control end of the second optocoupler 33 share a common point and are connected to the negative terminal of the relay 2 contact to be tested on the product line package; the first end of the output part of the first optocoupler 32 and the first end of the output part of the second optocoupler 33 are respectively connected to the second pull-up resistor 34 and the third pull-up resistor 35, and the first end and the tail end of the output part of the first optocoupler 32 are respectively connected to the IN1 input terminal and the DGND terminal of the FPGA module 36; the first end and the tail end of the output part of the second optocoupler 33 are respectively connected to the IN2 input terminal and the DGND terminal of the FPGA module 36; in this embodiment, the resistance values ​​of the first voltage divider resistor 31, the second pull-up resistor 34 and the third pull-up resistor 35 are selected according to the signal carried by the relay 2 contact to be tested on the product line package and the IO input level of the FPGA module 36;

[0037] The communication module 4 is used for data transmission between the jitter detection module 3 and the host computer monitoring module 5;

[0038] The host computer monitoring module 5 is used to set the pulse width threshold and compare it with the pulse width values ​​of the IN1 and IN2 input terminals in real time to determine the type and jitter status of the signal source carried by each switch contact of the relay 2. The host computer monitoring module 5 is also used to display and store the detection data of the relay 2. In this embodiment, when the pulse width value of the IN1 input terminal is greater than the pulse width threshold and the pulse width value of the IN2 input terminal is less than the pulse width threshold, it is determined that the contact of the relay 2 is jittering, and the signal source carried by the contact is the positive power supply terminal when the product is working normally. When the pulse width value of the IN1 input terminal is less than the pulse width threshold and the pulse width value of the IN2 input terminal is greater than the pulse width threshold, it is determined that the contact of the relay 2 is jittering, and the signal source carried by the contact is the negative power supply terminal when the product is working normally.

[0039] like Figure 2As shown, in this embodiment, the interconnected optocoupler group consisting of the first voltage divider resistor 31, the first optocoupler 32, the second pull-up resistor 34, the second optocoupler 33, and the third pull-up resistor 35 is one channel. The interconnected optocoupler group can simultaneously measure more than or equal to 300 channels by expanding the number of groups at the IN input terminal of the FPGA module 36.

[0040] like Figure 3 , Figure 4 As shown, in a specific implementation of this embodiment, when relay 2 is powered by a conventional single power supply, the signal source type of the switch contact of relay 2 is VCC, GND, or passive. When the switch contact of relay 2 bounces, if the signal source of the switch contact of relay 2 is VCC, the optocoupler is turned on, and the FPGA module 36 inputs a low-level IN1 signal. The signal pulse width of IN1 can be obtained through the upper computer monitoring module 5 to evaluate the bounce of the switch contact of relay 2. However, once the signal source of the switch of relay 2 is GND, relay 2 experiences a bounce fault, but at this time the optocoupler is still not turned on, thus causing the bounce detection to fail. Moreover, due to the limitations of related circuits, it may directly short-circuit and damage relay 2. Therefore, in this embodiment, after changing the power supply method of relay 2 to dual power supply, the signal source type of the switch contact of relay 2 is V+ or V-. When the switch contact of relay 2 bounces, regardless of whether the signal source of the switch contact of relay 2 is V+ or V-, One of the first optocoupler 32 and the second optocoupler 33 must be conducting. That is to say, by using the first optocoupler 32 and the second optocoupler 33 to form an interconnected optocoupler group, a voltage difference of equal magnitude and opposite sign can be formed across the first optocoupler 32 and the second optocoupler 33. In this way, regardless of the type of active contact of relay 2, there is no need to identify it in advance. Rapid jitter detection of multiple contacts can be performed directly. The communication module 4 will send the signal detected by the jitter detection module 3 to the host computer monitoring module 5, so that the host computer monitoring module 5 can simultaneously obtain the pulse width of IN1 and IN2 signals. This allows the host computer monitoring module 5 to accurately identify the jitter of the switch contact of relay 2 and directly determine the signal source type of the switch contact of relay 2. This avoids the need for conventional testing equipment and methods to identify the signal source of active contacts in advance, improves testing efficiency, realizes rapid jitter detection of multiple types of active contacts, and solves the problem of detection failure or damage to the test product when performing jitter detection on relays.

[0041] like Figure 5 As shown, a general-purpose method for rapid detection of multi-channel relay switch contacts includes the following steps:

[0042] S1. Change the power supply method; When performing jitter detection on the switch contacts of the relay 2 to be tested on the product line package, change the original power supply method of the power supply module 1, so that the positive terminal V+ of the power supply in the power supply module 1 is connected to the positive terminal of the power supply input of the relay 2, and the negative terminal V- of the power supply in the power supply module 1 is connected to the GND terminal of the power supply input of the relay 2. The tail end of the control part of the first optocoupler 32 and the head end of the control part of the second optocoupler 33 are at the same point and connected to the KGND terminal of the power supply module 1 through the first voltage divider resistor 31. The difference ΔV1 between the positive terminal V+ and the negative terminal V- of the power supply in the power supply module 1 is equal to the difference ΔV between the positive terminal VCC and the negative terminal GND of the power supply input of the relay 2.

[0043] S2, Threshold parameter setting; Set the pulse width threshold of relay 2 switch contact bounce detection signals IN1 and IN2 to μ;

[0044] S3. Start testing; The jitter detection module 3 detects the jitter status of a certain switch contact of relay 2 in real time and transmits the pulse widths μ1 and μ2 of the switch contact jitter detection signals IN1 and IN2 to the host computer monitoring module 5 for real-time display and storage via RS485 serial communication.

[0045] S4. Based on the jitter detection signal of the relay 2 switch contact displayed by the upper computer monitoring module 5, evaluate the jitter status of the relay 2 switch contact in real time; extract and compare the pulse width μ1 of the jitter detection signal IN1 and the pulse width μ2 of the jitter detection signal IN2 obtained simultaneously. When μ > μ1 and μ > μ2, it is determined that the contact of relay 2 has not jittered; when μ < μ1 and μ > μ2, it is indicated that the contact of relay 2 has jittered, and the signal source of the contact when relay 2 is working normally is the positive terminal VCC of the power supply input of relay 2; when μ > μ1 and μ < μ2, it is determined that the contact of relay 2 has jittered, and the signal source of the contact when relay 2 is working normally is the negative terminal GND of the power supply input of relay 2.

[0046] As shown in Figures 6-1, 6-2, and 6-3, in a specific embodiment of this example, P1 is the power supply module of the system. The power supply module uses a dual power supply, with a positive output of +14V and a negative output of -14V, resulting in a voltage difference of 28V. The optocoupler module UU1 uses a dual-channel high-speed optocoupler HCPL-2631. When the optocoupler is disconnected, pins 7 and 6 of the optocoupler module UU1 output a high level; when the optocoupler is on, pins 7 and 6 output a low level. Pins 2 and 4 are common and connected to the KGND terminal of the power supply module through a voltage divider resistor. Pins 1 and 3 are common and connected to the negative terminal of the product relay contact. Pin 7 is connected to the FGPAI1 pin of the FPGA module, and pin 6 is connected to the FGPAI2 pin of the FPGA module. When the relay switch bounces, if the signal source of the relay switch is +14V, pin 7 of the optocoupler module UU1 outputs a low level. The jitter detection signal IN1 is sent to the host computer via the FPGAI1 channel (J21 pin) of the FPGA module. If the signal source of the relay switch is -14V, the optocoupler module UU1 pin 6 outputs a low level. The jitter detection signal IN2 is sent to the host computer via the FPGAI2 channel (J22 pin) of the FPGA module. By identifying the pulse widths of the jitter detection signals IN1 and IN2, the host computer can accurately evaluate the jitter of the relay switch. It can be seen that the detection system and detection method provided in this embodiment can accurately identify the signal source of the contact in one detection and can realize the rapid jitter detection of any signal source contact. It eliminates the drawbacks of using existing equipment for relay active switch contact jitter detection, greatly improves the efficiency of relay switch contact jitter detection, and significantly improves the reliability and versatility of relay switch contact jitter detection. The method is simple to operate, highly versatile for relay contact detection, and has high testing efficiency.

[0047] In summary, the universal multi-channel relay switch contact rapid detection system provided by this invention achieves signal source conversion of the relay 2 switch contact by changing the power supply method of the relay 2. By using the first optocoupler 32 and the second optocoupler 33 to form an interconnected optocoupler group, an equal and opposite voltage difference can be formed across the first optocoupler 32 and the second optocoupler 33. Thus, regardless of the type of active contact of the relay 2, no prior identification is required, and rapid multi-contact bounce detection can be performed directly. Simultaneously, this method can accurately identify the signal source of the contact in a single detection. The method is simple to operate, highly versatile for relay 2 contact detection, and has high testing efficiency. It can achieve rapid bounce detection of contacts with any signal source, eliminating the drawbacks of using existing equipment for relay active switch contact bounce detection, greatly improving the efficiency of relay switch contact bounce detection, and significantly enhancing the reliability and versatility of relay switch contact bounce detection.

[0048] 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 invention. The illustrative expressions of the above terms in this specification should not be construed as necessarily referring 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. In addition, those skilled in the art can combine and integrate the different embodiments or examples described in this specification.

[0049] 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 general-purpose multi-channel relay switch contact rapid detection system, characterized in that, It includes a power supply module (1), a relay (2), a jitter detection module (3), a communication module (4), and a host computer monitoring module (5), wherein: The power supply module (1) is used to connect the relay (2) to be tested on the product line package. The power supply module (1) is powered by a dual power supply. The power supply module (1) is provided with a positive terminal V+, a negative terminal V- and a KGND terminal. The positive terminal V+ of the power supply module (1) is connected to the positive terminal of the power supply input of the relay (2). The negative terminal V- of the power supply module (1) is connected to the negative terminal of the power supply input of the relay (2). The difference between the positive terminal V+ and the negative terminal V- of the power supply module (1) is ΔV1. The difference between the positive terminal VCC and the negative terminal GND of the power supply input of the relay (2) is ΔV. ΔV1 = ΔV. The jitter detection module (3) includes several interconnected optocoupler groups and an FPGA module (36). The interconnected optocoupler groups also include a first voltage divider resistor (31), a first optocoupler (32), a second optocoupler (33), a second pull-up resistor (34), and a third pull-up resistor (35) that are connected to each other. The FPGA module (36) includes at least one set of IN1 input terminal and GND terminal and one set of IN2 input terminal and GND terminal. Each set of interconnected optocoupler groups is connected to each set of IN1 input terminal and IN2 input terminal respectively. The FPGA module (36) acquires the pulse width values ​​of the IN1 input terminal and IN2 input terminal in real time. The communication module (4) is used for data transmission between the jitter detection module (3) and the host computer monitoring module (5); The host computer monitoring module (5) is used to set the pulse width threshold and compare it with the pulse width values ​​of the IN1 input terminal and the IN2 input terminal in real time to determine the type and jitter status of the signal source carried by each switch contact of the relay (2). The host computer monitoring module (5) is also used to display and store the detection data of the relay (2).

2. The universal multi-channel relay switch contact rapid detection system as described in claim 1, characterized in that: When the pulse width values ​​of both the IN1 and IN2 input terminals are less than the pulse width threshold, it is determined that the contact of relay 2 has not bounced. When the pulse width value of the IN1 input terminal is greater than the pulse width threshold and the pulse width value of the IN2 input terminal is less than the pulse width threshold, it is determined that the contact of relay 2 is jittering, and the signal source of the contact is the positive power supply terminal when the product is working normally. When the pulse width value of the IN1 input terminal is less than the pulse width threshold and the pulse width value of the IN2 input terminal is greater than the pulse width threshold, it is determined that the contact of the relay (2) is jittering, and the signal source of the contact is the negative power supply terminal when the product is working normally.

3. The universal multi-channel relay switch contact rapid detection system as described in claim 1, characterized in that: The interconnected optocoupler group consisting of the first voltage divider resistor (31), the first optocoupler (32), the second pull-up resistor (34), the second optocoupler (33), and the third pull-up resistor (35) is one channel. The interconnected optocoupler group can simultaneously measure more than or equal to 300 channels by expanding the number of groups of the IN input terminal of the FPGA module (36).

4. The universal multi-channel relay switch contact rapid detection system as described in claim 3, characterized in that: The tail end of the control section of the first optocoupler (32) and the head end of the control section of the second optocoupler (33) are at the same point and connected to the KGND terminal of the power supply module (1) through the first voltage divider resistor (31); the head end of the control section of the first optocoupler (32) and the tail end of the control section of the second optocoupler (33) are at the same point and connected to the negative terminal of the contact of the relay (2) to be tested on the product line package; the head end of the output section of the first optocoupler (32) and the head end of the output section of the second optocoupler (33) are respectively connected to the second pull-up resistor (34) and the third pull-up resistor (35); the head end and the tail end of the output section of the first optocoupler (32) are respectively connected to the IN1 input terminal and the DGND terminal of the FPGA module (36); the head end and the tail end of the output section of the second optocoupler (33) are respectively connected to the IN2 input terminal and the DGND terminal of the FPGA module (36).

5. The universal multi-channel relay switch contact rapid detection system as described in claim 4, characterized in that: The resistance values ​​of the first voltage divider resistor (31), the second pull-up resistor (34), and the third pull-up resistor (35) are selected according to the signal carried by the relay (2) contact to be tested on the product line package and the IO input level of the FPGA module (36).

6. A general-purpose multi-channel relay switch contact rapid detection method as described in any one of claims 1-5, characterized in that: Includes the following steps: S1. Change the power supply method; When performing jitter detection on the switch contacts of the relay (2) to be tested on the product line package, change the original power supply method through the power supply module (1), so that the positive power supply terminal V+ in the power supply module (1) is connected to the positive power supply input terminal of the relay (2), the negative power supply terminal V- in the power supply module (1) is connected to the power supply input GND terminal of the relay (2), and the tail end of the control part of the first optocoupler (32) and the head end of the control part of the second optocoupler (33) are at the same point and connected to the KGND terminal of the power supply module (1) through the first voltage divider resistor (31); wherein, the difference ΔV1 between the positive power supply terminal V+ and the negative power supply terminal V- in the power supply module (1) is equal to the difference ΔV between the positive power supply input terminal VCC and the negative power supply input terminal GND of the relay (2); S2, Threshold parameter setting; Set the pulse width threshold of relay (2) switch contact bounce detection signals IN1 and IN2 to μ; S3, Start testing; Real-time detection of the jitter status of a certain switch contact of relay (2) is performed by the jitter detection module (3), and the pulse widths μ1 and μ2 of the switch contact jitter detection signals IN1 and IN2 are transmitted to the host computer monitoring module (5) via RS485 serial communication for real-time display and storage; S4. Based on the jitter detection signal of the relay (2) switch contact displayed by the upper computer monitoring module (5), evaluate the jitter status of the relay (2) switch contact in real time; extract and compare the pulse width μ1 of the jitter detection signal IN1 and the pulse width μ2 of the jitter detection signal IN2 obtained at the same time. When μ>μ1 and μ>μ2, it is determined that the contact of the relay (2) has not jittered; when μ<μ1 and μ>μ2, it is indicated that the contact of the relay (2) has jittered, and when the relay (2) is working normally, the signal source of the contact is the positive terminal VCC of the power supply input of the relay (2); when μ>μ1 and μ<μ2, it is determined that the contact of the relay (2) has jittered, and when the relay (2) is working normally, the signal source of the contact is the negative terminal GND of the power supply input of the relay (2).

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