On-board relay insulation and voltage resistance automatic test circuit and implementation method

Abstract

The invention provides an onboard relay insulation voltage resistance automatic test circuit and an implementation method, the output end of a main control circuit is connected with the control port of a drive circuit, and the output end of the drive circuit is connected with the control port of a test channel switching circuit; the control instruction is converted into a control signal capable of driving the test channel switching circuit to work, and the control signal is output to the test channel switching circuit; a switching port of the test channel switching circuit is connected with a contact of a to-be-tested relay and the test interface circuit, different test channels are switched according to a control signal, and the contact of the to-be-tested relay is connected with the test interface circuit; and the test interface circuit is connected with the auxiliary test equipment. According to the method, the insulation resistance and the insulation voltage resistance of each point position of the onboard relay can be accurately, quickly and conveniently tested in the relay contact testing process, and the quickness of the testing process and the accuracy of the testing result are improved.

Description

Technical Field

[0001] The present invention relates to the technical field of electrical equipment testing, and more particularly to an automatic testing circuit for insulation withstand voltage of a board-mounted relay and an implementation method thereof. Background Art

[0002] Insulation withstand voltage is the main electrical characteristic parameter of onboard relays and an important indicator related to the reliability of relay applications. At present, domestic relay manufacturers and electrical maintenance stations usually use manual testing methods for testing. The manual testing process is cumbersome and unsafe. There are many contact groups of onboard relays, and there are many types of relays. The locations of contact distribution are also different. During the test, the insulation resistance and insulation withstand voltage values ​​between multiple points need to be tested. The test results need to be recorded manually. The test efficiency is too low, which will also cause a lot of waste of manpower and material resources. Summary of the invention

[0003] The technical problem to be solved by the present invention is to provide an automatic test circuit and implementation method for the insulation withstand voltage of an on-board relay in view of the deficiencies in the above-mentioned prior art, aiming to solve the problems of cumbersome and low accuracy manual testing process and the need for manual recording of test results, thereby saving a lot of manpower and material resources.

[0004] In order to achieve the above-mentioned object, the main technical scheme adopted by the on-board relay insulation withstand voltage automatic test circuit of the present invention includes a main control circuit, a drive circuit, a test channel switching circuit and a test interface circuit; The output end of the main control circuit is connected to the control port of the drive circuit for outputting control instructions and receiving test results; The output end of the driving circuit is connected to the control port of the test channel switching circuit, and is used to receive the control instruction output by the main control circuit, and convert the control instruction into a control signal capable of driving the test channel switching circuit to work and output it to the test channel switching circuit, so as to control the test channel switching circuit to complete the corresponding state switching; The switching port of the test channel switching circuit is connected to the contact of the relay to be tested and the test interface circuit, and is used to receive the control signal output by the drive circuit, and according to the control signal, switch different test channels to connect the contact of the relay to be tested with the test interface circuit; The test interface circuit is connected to the auxiliary test equipment and is used to provide an interface between the relay to be tested and the auxiliary test equipment, so as to complete the automatic measurement of the insulation resistance and insulation withstand voltage value of the relay to be tested.

[0005] A method for realizing an automatic test circuit for insulation withstand voltage of an onboard relay comprises the following steps: Step 1: The main control circuit controls the output state of the IO port according to the model of the relay to be tested; Step 2, controlling the output state of the driving circuit through the output state of the IO port of the main control circuit; Step 3, controlling the test channel switching circuit to perform state conversion through the output state of the driving circuit, ensuring that each contact of the relay to be tested can be correctly connected to the auxiliary test equipment through the test interface circuit; Step 4: After the test channel switching circuit completes the state conversion, the auxiliary test equipment starts to measure the insulation resistance and insulation withstand voltage of the relay under test, and returns the test results to the main control circuit. The main control circuit displays the corresponding test results and controls the peripheral circuit to reset.

[0006] In step 3, the contact positions of the relay to be tested are logically transformed with the drive circuit and the test channel switching circuit to achieve automatic testing of the insulation resistance and insulation withstand voltage of the relay to be tested.

[0007] The present invention has the following beneficial effects and advantages: 1. The present invention provides an on-board relay insulation withstand voltage automatic test circuit and implementation method, which solves the problems of cumbersome manual test process and low accuracy and the need to manually record test results, thus saving a lot of manpower and material resources; 2. The method of the present invention can ensure that the insulation resistance and insulation withstand voltage of each point of the on-board relay can be tested accurately, quickly and conveniently during the relay contact test, thereby improving the speed of the test process and the accuracy of the test results. BRIEF DESCRIPTION OF THE DRAWINGS

[0008] Figure 1 It is a flow chart of a method for implementing the automatic test circuit for insulation withstand voltage of a board-mounted relay of the present invention; Figure 2 This is the principle block diagram of the drive circuit in the automatic test circuit for insulation withstand voltage of the onboard relay; Figure 3 This is the schematic diagram of the test channel switching circuit in the onboard relay insulation withstand voltage automatic test circuit; Figure 4 This is the schematic diagram of the main control circuit in the onboard relay insulation withstand voltage automatic test circuit; Figure 5 It is the schematic diagram of the test interface circuit in the automatic test circuit of the insulation withstand voltage of the on-board relay; Figure 6 This is the schematic diagram of the drive circuit in the automatic test circuit for insulation withstand voltage of the onboard relay; Figure 7 This is a schematic diagram of the onboard relay contact locations. DETAILED DESCRIPTION

[0009] The present invention will be further described below in conjunction with the accompanying drawings.

[0010] Figure 2 The schematic diagram of the driving circuit in the automatic test circuit for insulation withstand voltage of a board-mounted relay of the present invention is shown in FIG. Figure 2 As shown, the on-board relay insulation withstand voltage automatic test circuit includes a main control circuit, a drive circuit, a test channel switching circuit and a test interface circuit; The output end of the main control circuit is connected to the control port of the drive circuit for outputting control instructions and receiving test results; The output end of the driving circuit is connected to the control port of the test channel switching circuit, and is used to receive the control instruction output by the main control circuit, and convert the control instruction into a control signal capable of driving the test channel switching circuit to work and output it to the test channel switching circuit, so as to control the test channel switching circuit to complete the corresponding state switching; The switching port of the test channel switching circuit is connected to the contact of the relay to be tested and the test interface circuit, and is used to receive the control signal output by the drive circuit, and according to the control signal, switch different test channels to connect the contact of the relay to be tested with the test interface circuit; The test interface circuit is connected to the auxiliary test equipment and is used to provide an interface between the relay to be tested and the auxiliary test equipment, so as to complete the automatic measurement of the insulation resistance and insulation withstand voltage value of the relay to be tested.

[0011] Figure 1 The flowchart of the method for realizing the automatic test circuit for insulation withstand voltage of a board-mounted relay using the automatic test circuit for insulation withstand voltage of a board-mounted relay is as follows: Figure 1 As shown, the method for implementing the onboard relay insulation withstand voltage automatic test circuit includes the following steps: Step 1: The main control circuit controls the output state of the IO port according to the model of the relay to be tested; Step 2, controlling the output state of the driving circuit through the output state of the IO port of the main control circuit; Step 3, controlling the test channel switching circuit to perform state conversion through the output state of the driving circuit, ensuring that each contact of the relay to be tested can be correctly connected to the auxiliary test equipment through the test interface circuit; Step 4: After the test channel switching circuit completes the state conversion, the auxiliary test equipment starts to measure the insulation resistance and insulation withstand voltage of the relay under test, and returns the test results to the main control circuit. The main control circuit displays the corresponding test results and controls the peripheral circuit to reset.

[0012] Example: Now take the method of multi-channel contact resistance test of railway signal relay as an example, combined with the attached Figure 3 , Attachment Figure 4 , Attachment Figure 5 , Attachment Figure 6 The specific implementation modes of the method of the present invention are described in detail.

[0013] When the main control circuit in the onboard relay insulation withstand voltage automatic test circuit starts working, the output state of its IO port is converted into high and low levels according to the relay model, such as Figure 4 As shown; the negative electrode of the input end of the photocoupler OC2-OC14 in the drive circuit is connected to the IO port of the main control circuit, and the positive electrode of the input end of the photocoupler OC2-OC14 is connected to the positive electrode after passing through the light-emitting diode, and the output state changes accordingly by controlling the different I / O port states, such as Figure 6 As shown; the output end of the drive circuit is connected to the positive electrode of the reed relay control end in the test channel switching circuit after passing through the field effect tube, the negative electrode of the reed relay control end is connected to the negative power, one end of the output end of the reed relay is connected to the test interface circuit, and the other end is connected to the auxiliary test equipment, such as Figure 3 As shown; the relay to be tested is connected through CZ1 and CZ2 in the test interface circuit, and the auxiliary test equipment is connected through JP1 and JP2, as shown Figure 5 shown.

[0014] Taking JY-B105 relay as an example, the judgment steps of the present invention are described: JY-B105 relay is a 6-group contact relay, which is divided into 1 group of long-closed contacts and 5 groups of normally open contacts, and the distribution positions are as shown in the attached figure. Figure 7 As shown in the figure, the distribution positions of 1 group of normally closed contacts on the relay are 21 and 22, and the distribution positions of 5 groups of normally open contacts on the relay are 14, 13, 34, 33, 44, 43, 54, 53, 64, 63. If the insulation withstand voltage value of the relay contacts to the coil is tested, the RB5 and RD3 outputs of the main control circuit are low level control. Figure 6 The optocouplers OC2 and OC14 in the control Figure 3 Close the reed relays K7 and K8 in the circuit, connect the first set of contacts of the onboard relay and the coil to the auxiliary test equipment for testing, and complete the test of the first set of contacts on the coil; in addition, it is necessary to perform the insulation withstand voltage value test of the disconnected contacts and the insulation withstand voltage value test between the contacts to complete all the tests.

[0015] In order to test the insulation resistance and insulation withstand voltage of the relay to be tested (including between relay contacts, between contacts and ground, and between nodes and coils), the present invention provides an automatic test circuit and implementation method for insulation withstand voltage of a board-mounted relay, including the following steps: 1. The main control circuit controls the output state of the IO port according to the model of the relay to be tested; 2. Control the output state of the drive circuit through the output state of the IO port of the main control circuit; 3. Control the test channel switching circuit to perform state conversion through the output state of the drive circuit to ensure that each contact of the relay to be tested can be correctly connected to the auxiliary test equipment through the test interface circuit; 4. After the test channel switching circuit completes the state conversion, the auxiliary test equipment starts to measure the insulation resistance and insulation withstand voltage of the relay under test, and returns the test results to the main control circuit. The main control circuit displays the corresponding test results and controls the peripheral circuit to reset.

[0016] The above disclosure is only the preferred embodiment of the present invention, which certainly cannot be used to limit the scope of the present invention. Therefore, equivalent changes made according to the claims of the present invention are still within the scope of the present invention.

Claims

1. An automatic test circuit for insulation withstand voltage of a board-mounted relay, characterized in that: It includes a main control circuit, a driving circuit, a test channel switching circuit and a test interface circuit; The output end of the main control circuit is connected to the control port of the drive circuit for outputting control instructions and receiving test results; The output end of the driving circuit is connected to the control port of the test channel switching circuit, and is used to receive the control instruction output by the main control circuit, and convert the control instruction into a control signal capable of driving the test channel switching circuit to work and output it to the test channel switching circuit, so as to control the test channel switching circuit to complete the corresponding state switching; The switching port of the test channel switching circuit is connected to the contact of the relay to be tested and the test interface circuit, and is used to receive the control signal output by the drive circuit, and according to the control signal, switch different test channels to connect the contact of the relay to be tested with the test interface circuit; The test interface circuit is connected to the auxiliary test equipment and is used to provide an interface between the relay to be tested and the auxiliary test equipment, so as to complete the automatic measurement of the insulation resistance and insulation withstand voltage value of the relay to be tested.

2. A method for realizing an automatic test circuit for insulation withstand voltage of an onboard relay, characterized in that: The following steps are involved: Step 1: The main control circuit controls the output state of the IO port according to the model of the relay to be tested; Step 2, controlling the output state of the driving circuit through the output state of the IO port of the main control circuit; Step 3, controlling the test channel switching circuit to perform state conversion through the output state of the driving circuit, ensuring that each contact of the relay to be tested can be correctly connected to the auxiliary test equipment through the test interface circuit; Step 4: After the test channel switching circuit completes the state conversion, the auxiliary test equipment starts to measure the insulation resistance and insulation withstand voltage of the relay under test, and returns the test results to the main control circuit. The main control circuit displays the corresponding test results and controls the peripheral circuit to reset.

3. A method for realizing an automatic test circuit for insulation withstand voltage of an onboard relay according to claim 2, characterized in that: In step 3, the contact positions of the relay to be tested are logically transformed with the drive circuit and the test channel switching circuit to achieve automatic testing of the insulation resistance and insulation withstand voltage of the relay to be tested.

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