Multi-channel switching circuit for voltage withstanding instrument

Abstract

The utility model discloses a multichannel switching circuit for a voltage withstanding instrument, which relates to the field of voltage withstanding instrument control, and comprises a power supply device for providing electric energy in a channel switching process; the control circuit is used for controlling channel switching through the interface connector; the execution circuit is used for selecting a switching channel after the connection state of the relay is changed; the output circuit is used for outputting a channel switching result; wherein one end of the power supply is connected with one end of the control circuit, the other end of the control circuit is connected with one end of the execution circuit, and the other end of the execution circuit is connected with one end of the output circuit. According to the utility model, the multi-channel switching technology is mainly adopted, and eight-channel output can be realized, so that when a plurality of tested products are tested, external conversion is not needed, conversion can be carried out inside an instrument only by connecting a wiring harness, high-voltage output can be switched and controlled, and automatic testing of a production line is further facilitated.

Description

Technical Field

[0001] This utility model relates to the field of withstand voltage tester control, and more specifically, to a multi-channel switching circuit for a withstand voltage tester. Background Technology

[0002] A withstand voltage tester is a testing instrument used to test whether electrical equipment, cables, electronic components, insulating materials, etc., can withstand high voltage without being broken down or damaged. It is widely used in power equipment manufacturing, maintenance, quality control and other fields to ensure that the insulation performance of products meets relevant standards and to protect the safety of equipment and users.

[0003] A withstand voltage tester detects insulation breakdown or leakage by applying high voltage to the test object. Currently, most withstand voltage testers are single-channel instruments, which can only output one high voltage and one circuit. This means that only one test object can be connected during testing, and the test point is also fixed, resulting in low testing efficiency.

[0004] No effective solutions have yet been proposed to address the problems in the relevant technologies. Utility Model Content

[0005] In view of the problems in the related technologies, this utility model proposes a multi-channel switching circuit for a withstand voltage tester to overcome the above-mentioned technical problems existing in the existing related technologies.

[0006] Therefore, the specific technical solution adopted by this utility model is as follows:

[0007] A multi-channel switching circuit for a withstand voltage tester, the multi-channel switching circuit comprising:

[0008] A power supply device used to provide electrical power during channel switching;

[0009] Control circuitry for controlling channel switching via interface connector;

[0010] An execution circuit used to select and switch channels after changing the relay connection state;

[0011] Output circuit used to output channel switching results;

[0012] One end of the power supply is connected to one end of the control circuit, the other end of the control circuit is connected to one end of the execution circuit, and the other end of the execution circuit is connected to one end of the output circuit.

[0013] Preferably, the control circuit includes connectors J4 and J5; the first pin of connector J4 is connected to digital signal control line DLT5, the second pin of connector J4 is connected to digital signal control line DLT6, the third pin of connector J4 is connected to digital signal control line DLT7, and the fourth pin of connector J4 is connected to digital signal control line DLT8; the first pin of connector J5 is connected to digital signal control line DLT1, the second pin of connector J5 is connected to digital signal control line DLT2, the third pin of connector J5 is connected to digital signal control line DLT3, and the fourth pin of connector J5 is connected to digital signal control line DLT4.

[0014] Preferably, the execution circuit consists of RY1 switching channel, RY2 switching channel, RY3 switching channel and RY4 switching channel, and one end of RY1 switching channel is connected to one end of RY2 switching channel, the other end of RY2 switching channel is connected to one end of RY3 switching channel, and the other end of RY3 switching channel is connected to one end of RY4 switching channel.

[0015] Preferably, the RY1 switching channel includes a relay RY1, a diode D1, a connector P1, and a connector P2; the first pin of the relay RY1 is connected to one end of the power supply, the second pin of the relay RY1 is connected to one end of the diode D1, the other end of the diode D1 is connected to the other end of the power supply, the third pin of the relay RY1 is connected to one end of the connector P1, and the fourth pin of the relay RY1 is connected to one end of the connector P2 and one end of the output circuit, respectively.

[0016] Preferably, the RY2 switching channel includes a relay RY2, a diode D2, a connector P3, and a connector P4; the first pin of the relay RY2 is connected to one end of the power supply, the second pin of the relay RY2 is connected to one end of the diode D2, the other end of the diode D2 is connected to the other end of the power supply, the third pin of the relay RY2 is connected to one end of the connector P3, and the fourth pin of the relay RY2 is connected to one end of the connector P4 and one end of the output circuit, respectively.

[0017] Preferably, the RY3 switching channel includes a relay RY3, a diode D3, a connector P5, and a connector P6; the first pin of the relay RY3 is connected to one end of the power supply, the second pin of the relay RY3 is connected to one end of the diode D3, the other end of the diode D3 is connected to the other end of the power supply, the third pin of the relay RY3 is connected to one end of the connector P5, and the fourth pin of the relay RY3 is connected to one end of the connector P6 and one end of the output circuit, respectively.

[0018] Preferably, the RY4 switching channel includes a relay RY4, a diode D4, a connector P7, and a connector P8; the first pin of the relay RY4 is connected to one end of the power supply, the second pin of the relay RY4 is connected to one end of the diode D4, the other end of the diode D4 is connected to the other end of the power supply, the third pin of the relay RY4 is connected to one end of the connector P7, and the fourth pin of the relay RY4 is connected to one end of the connector P8 and one end of the output circuit, respectively.

[0019] The beneficial effects of this utility model are as follows:

[0020] This invention mainly adopts multi-channel switching technology, which can realize eight-channel output. When testing multiple test items, no external conversion is required. Only the wiring harness needs to be connected, and the instrument can switch internally to realize the switching control of high voltage output, which is beneficial to the automated testing of the production line. Attached Figure Description

[0021] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0022] Figure 1 This is a schematic block diagram of a multi-channel switching circuit for a withstand voltage tester according to an embodiment of the present invention;

[0023] Figure 2 This is one of the schematic diagrams of a power supply in a multi-channel switching circuit for a withstand voltage tester according to an embodiment of the present invention;

[0024] Figure 3 This is a second schematic diagram of a power supply in a multi-channel switching circuit for a withstand voltage tester according to an embodiment of the present invention;

[0025] Figure 4 This is a schematic diagram of connector J3 in a multi-channel switching circuit for a withstand voltage tester according to an embodiment of the present invention;

[0026] Figure 5 This is a schematic diagram of connector J4 in a multi-channel switching circuit for a withstand voltage tester according to an embodiment of the present invention;

[0027] Figure 6 This is a schematic diagram of connector J5 in a multi-channel switching circuit for a withstand voltage tester according to an embodiment of the present invention;

[0028] Figure 7This is a schematic diagram of the execution circuit in a multi-channel switching circuit for a withstand voltage tester according to an embodiment of the present invention;

[0029] Figure 8 This is one of the flowcharts of a multi-channel switching circuit for a withstand voltage tester according to an embodiment of the present utility model;

[0030] Figure 9 This is the second flowchart of a multi-channel switching circuit for a withstand voltage tester according to an embodiment of the present invention.

[0031] In the picture:

[0032] 1. Power supply; 2. Control circuit; 3. Execution circuit; 4. Output circuit. Detailed Implementation

[0033] To further illustrate the various embodiments, the present invention provides accompanying drawings, which are part of the disclosure of the present invention. These drawings are mainly used to illustrate the embodiments and can be used in conjunction with the relevant descriptions in the specification to explain the operating principles of the embodiments. With reference to these drawings, those skilled in the art should be able to understand other possible implementation methods and the advantages of the present invention.

[0034] According to an embodiment of the present invention, a multi-channel switching circuit for a withstand voltage tester is provided.

[0035] The present invention will now be further described in conjunction with the accompanying drawings and specific embodiments, such as... Figure 1 As shown, the multi-channel switching circuit for a withstand voltage tester according to an embodiment of the present invention includes:

[0036] Power supply 1 for providing electrical power during channel switching;

[0037] Control circuit 2 for controlling channel switching via interface connector;

[0038] Execution circuit 3 is used to select the switching channel after changing the relay connection state;

[0039] Output circuit 4 is used to output the channel switching results;

[0040] In this circuit, one end of the power supply 1 is connected to one end of the control circuit 2, the other end of the control circuit 2 is connected to one end of the execution circuit 3, and the other end of the execution circuit 3 is connected to one end of the output circuit 4.

[0041] It needs to be explained that, for example Figure 2 and Figure 3As shown, power supply 1 uses a 24V DC power supply to provide the basic electrical energy for the circuit to work. At the same time, the 24V power supply is connected to ground (GND), which provides power to the entire circuit. Resistors R1, R2, R3 and R4 (1MΩ resistor) are used for current limiting or voltage division. Diodes D5, D6, D7 and D8 (LED lights) are status indicator lights used to display the current working status of the circuit.

[0042] In one embodiment, the control circuit 2 includes connector J4 and connector J5; the first pin of connector J4 is connected to digital signal control line DLT5, the second pin of connector J4 is connected to digital signal control line DLT6, the third pin of connector J4 is connected to digital signal control line DLT7, and the fourth pin of connector J4 is connected to digital signal control line DLT8; the first pin of connector J5 is connected to digital signal control line DLT1, the second pin of connector J5 is connected to digital signal control line DLT2, the third pin of connector J5 is connected to digital signal control line DLT3, and the fourth pin of connector J5 is connected to digital signal control line DLT4.

[0043] like Figure 4 As shown, it should be explained that the control circuit 2 also includes connector J3 (14-pin connector), and the second pin of connector J3 is grounded. The third, third, third, fifth, sixth, seventh, eighth, ninth, and tenth pins of connector J3 are respectively connected to digital signal control lines DLT1, DLT2, DLT3, DLT4, DLT5, DLT6, DLT7, and DLT8.

[0044] like Figure 5 and Figure 6 As shown, digital signal control lines DLT8 to DLT1 are the interface for control signal input. Connector J4 (4-pin connector), labeled as RY-C signal (DLT8-DLT5), is used to control part of the logic of the relay. Connector J5 (4-pin connector) is also the control signal for the relay, labeled as RY-C signal (DLT4-DLT1).

[0045] In one embodiment, the execution circuit 3 is composed of RY1 switching channel, RY2 switching channel, RY3 switching channel and RY4 switching channel, and one end of RY1 switching channel is connected to one end of RY2 switching channel, the other end of RY2 switching channel is connected to one end of RY3 switching channel, and the other end of RY3 switching channel is connected to one end of RY4 switching channel.

[0046] like Figure 7 As shown, specifically, the RY1 switching channel includes relay RY1, diode D1, connector P1 and connector P2; the first pin of relay RY1 is connected to one end of power supply 1, the second pin of relay RY1 is connected to one end of diode D1, the other end of diode D1 is connected to the other end of power supply 1, the third pin of relay RY1 is connected to one end of connector P1, and the fourth pin of relay RY1 is connected to one end of connector P2 and one end of output circuit 4 respectively.

[0047] Specifically, the RY2 switching channel includes relay RY2, diode D2, connector P3 and connector P4; the first pin of relay RY2 is connected to one end of power supply 1, the second pin of relay RY2 is connected to one end of diode D2, the other end of diode D2 is connected to the other end of power supply 1, the third pin of relay RY2 is connected to one end of connector P3, and the fourth pin of relay RY2 is connected to one end of connector P4 and one end of output circuit 4 respectively.

[0048] Specifically, the RY3 switching channel includes relay RY3, diode D3, connector P5, and connector P6; the first pin of relay RY3 is connected to one end of power supply 1, the second pin of relay RY3 is connected to one end of diode D3, the other end of diode D3 is connected to the other end of power supply 1, the third pin of relay RY3 is connected to one end of connector P5, and the fourth pin of relay RY3 is connected to one end of connector P6 and one end of output circuit 4.

[0049] Specifically, the RY4 switching channel includes relay RY4, diode D4, connector P7, and connector P8; the first pin of relay RY4 is connected to one end of power supply 1, the second pin of relay RY4 is connected to one end of diode D4, the other end of diode D4 is connected to the other end of power supply 1, the third pin of relay RY4 is connected to one end of connector P7, and the fourth pin of relay RY4 is connected to one end of connector P8 and one end of output circuit 4.

[0050] It should be explained that relays RY1, RY2, RY3, and RY4 each control a high-voltage signal switch (HV). 4007 diodes (D1-D4) are connected to the two ends of the relay coil as freewheeling diodes to protect the relay coil from reverse induced current. Connectors (P3, P5, P7, P2, P4, P6, P8) are connected to the relay switching section to connect to an external high-voltage (HV) load. For example, P1 and P2 are the HV signal inputs, and P7 and P8 are the high-voltage return signals. Each group of relays controls one high-voltage path. By controlling the switches of relays RY1, RY2, RY3, and RY4, the high-voltage signal is switched on and off. The freewheeling diodes (D1-D4, 4007 diodes) absorb the reverse induced current when the relay coil is de-energized, protecting the components in the circuit from the effects of high-voltage reverse current.

[0051] To facilitate understanding of the above-mentioned technical solutions of this utility model, the working principle or operation method of this utility model in actual process will be described in detail below.

[0052] In practical applications, multi-channel switching technology is mainly adopted, which can achieve 8-channel output. When testing multiple test objects, no external conversion is required. Just connect the wiring harness and the instrument can switch internally. Switching is achieved by controlling the high-voltage relay, thereby realizing multiple channel output.

[0053] First, the program activates the relay by sending control signals. The relay operates based on the phenomenon of electromagnetic induction, using low-power electrical signals to control the energization and de-energization of an electromagnetic coil. This causes the internal mechanical structure of the relay to actuate, thereby controlling the circuit's on / off state. Figure 8 and Figure 9As shown, when DLT4 is pulled low, the relay is turned on, and the third and fourth pins of RY1 are also turned on. The input voltage is output through the RY1 relay. The parallel diode D1 acts as a freewheeling diode. When the relay in the on state is suddenly turned off, a large induced voltage and induced current will still be generated in the circuit. At this time, the parallel diode can make the induced current generated smoothly dissipate in the circuit formed by the diode and the coil without damaging the circuit. LED1 (green) serves as an indicator. When DLT4 is low, LED1 will be forward turned on and light up. The four high-voltage relays can control four channel outputs. The two printed circuit boards can control eight channel outputs by connecting them through blue and white lines. The implementation principle is that the control signal is connected to the socket J11. J11 has 8 signals (DL1-DL8). When there are four channels, J11 and J7 are connected to control the on and off of the four high-voltage relays RY1-RY4. When DL1 is pulled low, it controls the RY1 high-voltage relay to turn on. At the same time, the diode D1 connected in parallel with RY1 also turns on. LED1 (green) serves as an indicator. When DLT4 is low, LED1 will be forward-biased and emit light.

[0054] In summary, by utilizing the above-mentioned technical solution of this utility model, this utility model mainly adopts multi-channel switching technology, which can realize eight-channel output. This allows multiple test items to be tested without external conversion. Only the wiring harness needs to be connected, and the instrument can switch internally to control the high-voltage output, thereby facilitating automated testing on the production line.

[0055] The above are merely preferred embodiments of the present utility model and are not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model shall be included within the protection scope of the present utility model.

Claims

1. A multi-channel switching circuit for a withstand voltage tester, characterized in that, The multi-channel switching circuit includes: A power supply device (1) for providing electrical power during channel switching; Control circuit (2) for controlling channel switching via interface connector; An execution circuit (3) is used to select and switch channels after changing the relay connection state; Output circuit (4) for outputting channel switching results; One end of the power supply (1) is connected to one end of the control circuit (2), the other end of the control circuit (2) is connected to one end of the execution circuit (3), and the other end of the execution circuit (3) is connected to one end of the output circuit (4).

2. The multi-channel switching circuit for a withstand voltage tester according to claim 1, characterized in that, The control circuit (2) includes connector J4 and connector J5; The first pin of connector J4 is connected to digital signal control line DLT5, the second pin of connector J4 is connected to digital signal control line DLT6, the third pin of connector J4 is connected to digital signal control line DLT7, and the fourth pin of connector J4 is connected to digital signal control line DLT8. The first pin of connector J5 is connected to digital signal control line DLT1, the second pin of connector J5 is connected to digital signal control line DLT2, the third pin of connector J5 is connected to digital signal control line DLT3, and the fourth pin of connector J5 is connected to digital signal control line DLT4.

3. The multi-channel switching circuit for a withstand voltage tester according to claim 1, characterized in that, The execution circuit (3) is composed of RY1 switching channel, RY2 switching channel, RY3 switching channel and RY4 switching channel. One end of the RY1 switching channel is connected to one end of the RY2 switching channel, the other end of the RY2 switching channel is connected to one end of the RY3 switching channel, and the other end of the RY3 switching channel is connected to one end of the RY4 switching channel.

4. The multi-channel switching circuit for a withstand voltage tester according to claim 3, characterized in that, The RY1 switching channel includes a relay RY1, a diode D1, a connector P1, and a connector P2. The first pin of the relay RY1 is connected to one end of the power supply (1), the second pin of the relay RY1 is connected to one end of the diode D1, the other end of the diode D1 is connected to the other end of the power supply (1), the third pin of the relay RY1 is connected to one end of the connector P1, and the fourth pin of the relay RY1 is connected to one end of the connector P2 and one end of the output circuit (4).

5. The multi-channel switching circuit for a withstand voltage tester according to claim 4, characterized in that, The RY2 switching channel includes a relay RY2, a diode D2, a connector P3, and a connector P4. The first pin of the relay RY2 is connected to one end of the power supply (1), the second pin of the relay RY2 is connected to one end of the diode D2, the other end of the diode D2 is connected to the other end of the power supply (1), the third pin of the relay RY2 is connected to one end of the connector P3, and the fourth pin of the relay RY2 is connected to one end of the connector P4 and one end of the output circuit (4).

6. The multi-channel switching circuit for a withstand voltage tester according to claim 5, characterized in that, The RY3 switching channel includes a relay RY3, a diode D3, a connector P5, and a connector P6. The first pin of the relay RY3 is connected to one end of the power supply (1), the second pin of the relay RY3 is connected to one end of the diode D3, the other end of the diode D3 is connected to the other end of the power supply (1), the third pin of the relay RY3 is connected to one end of the connector P5, and the fourth pin of the relay RY3 is connected to one end of the connector P6 and one end of the output circuit (4).

7. The multi-channel switching circuit for a withstand voltage tester according to claim 6, characterized in that, The RY4 switching channel includes a relay RY4, a diode D4, a connector P7, and a connector P8. The first pin of the relay RY4 is connected to one end of the power supply (1), the second pin of the relay RY4 is connected to one end of the diode D4, the other end of the diode D4 is connected to the other end of the power supply (1), the third pin of the relay RY4 is connected to one end of the connector P7, and the fourth pin of the relay RY4 is connected to one end of the connector P8 and one end of the output circuit (4).

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