Adhesion detection and protection circuit for single-path relay

Abstract

The utility model provides an adhesion detection and protection circuit for a single-path relay, which comprises a relay control module, an L-item detection circuit module and an N-item detection circuit module, and is characterized in that the relay control module comprises a JD3 and a JD4; the L item detection circuit module comprises a C1, a C2, an R1, an R2 and a TVS1; the N-item detection circuit module comprises an R4, a D1, a U1, an R3 and a C3; and the LOUT1 of the JD3 and the NOUT1 of the JD4 are electrically connected with the LOUT1 of the U1 respectively. According to the relay adhesion detection and protection circuit of the utility model, low-cost element design is adopted, high performance can be realized, and the production cost can be reduced at the same time; the adhesion detection and protection circuit has the characteristic of quick response, can quickly perform judgment and protection operation, and greatly improves the safety.

Description

Technical Field

[0001] This utility model belongs to the technical field of single-channel relay adhesion detection and protection circuit, and particularly relates to a circuit for single-channel relay adhesion detection and protection. Background Technology

[0002] With the widespread adoption of new energy vehicles, the safety and reliability of charging stations have become a major concern. Relays, as a crucial component of charging stations, are vital for ensuring the safety of the charging process. However, after prolonged use, relays may become stuck together, preventing proper power disconnection and thus compromising equipment safety. Therefore, the purpose of this patent is to provide a precise, fast-responding, and low-cost single-channel relay sticking detection and protection circuit to address the problems existing in the prior art. Utility Model Content

[0003] To solve the above-mentioned technical problems, this utility model provides a circuit for single-channel relay adhesion detection and protection. The relay adhesion detection and protection circuit adopts a low-cost component design, which can achieve high performance while reducing production costs.

[0004] A circuit for detecting and protecting single-channel relay adhesion includes a relay control module, an L-phase detection circuit module, and an N-phase detection circuit module. The relay control module includes JD3 and JD4; the L-phase detection circuit module includes C1, C2, R1, R2, and TVS1; the N-phase detection circuit module includes R4, D1, U1, R3, and C3; LOUT1 of JD3 and NOUT1 of JD4 are electrically connected to LOUT1 of U1, respectively; LOUT1 of JD3 and NOUT1 of JD4 are electrically connected to... The NOUT of U1 and the LOUT of JD3 and the NOUT of JD4 are electrically connected to the input terminal of C1; C1 is electrically connected to C2; C2 is electrically connected to R1 and the output terminal of R1 is connected in parallel with R2 and TVS1, and R2 and TVS1 are electrically connected to GND respectively; D1 is electrically provided between the LOUT1 of U1 and U1; R4 is electrically connected between the NOUT terminal of U1 and U1; U1 is electrically connected to R3 and C3 respectively, and GND is electrically connected between U1 and C3.

[0005] Preferably, JD3 and JD4 are single-control double-pole relays.

[0006] Preferably, C1, C2, and C3 are multiple capacitors connected in series or parallel.

[0007] Preferably, R1, R2, R3, and R4 are multiple resistors connected in series or parallel.

[0008] Preferably, U1 is a common unidirectional optocoupler.

[0009] Preferably, the TVS1 is a TVS tube.

[0010] Preferably, VCC is a DC 12V power supply voltage.

[0011] Preferably, D1 is a common unidirectional diode.

[0012] Preferably, RLY_NCHK and RLY_LCHK are microcontroller detection signals.

[0013] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0014] This utility model's relay adhesion detection and protection circuit adopts a low-cost component design, achieving high performance while reducing production costs. The adhesion detection and protection circuit features a fast response, enabling rapid judgment and protection operations, greatly improving safety. Simultaneously, during use, when the voltage exceeds a preset threshold, the protection circuit will quickly take measures, such as disconnecting the N-line relay or the L-line relay, to protect the safety of the charging pile and the user. Attached Figure Description

[0015] Figure 1 This is the main power circuit diagram of an existing charging gun / charging station.

[0016] Figure 2 This is a circuit diagram of the present invention. Detailed Implementation

[0017] The present invention will now be described in detail with reference to the accompanying drawings, as shown below. Figure 2 As shown, a circuit for single-channel relay adhesion detection and protection includes a relay control module, an L-phase detection circuit module, and an N-phase detection circuit module. The relay control module includes JD3 and JD4. The L-phase detection circuit module includes C1, C2, R1, R2, and TVS1. It monitors the voltage status of the L_OUT line in real time based on the voltage signal input from the voltage detection module. When the voltage exceeds a preset threshold, the protection circuit will quickly take measures, such as disconnecting the L-phase relay, to protect the safety of the charging pile and the user. The N-phase detection circuit module includes R4, D1, U1, R3, and C3. It monitors the status of the N_OUT line in real time based on the voltage signal acquired by the optocoupler. When the voltage exceeds a preset threshold...

[0018] The protection circuit will take swift action, such as disconnecting the N-line relay, to protect the charging station and the user's safety. LOUT1 in JD3 and NOUT1 in JD4 are electrically connected to LOUT1 of U1. LOUT in JD3 and NOUT in JD4 are electrically connected to NOUT of U1, and LOUT in JD3 and NOUT in JD4 are also electrically connected to the input terminal of C1. C1 is electrically connected to C2. C2 is electrically connected to R1, and the output terminal of R1 is connected in parallel with R2 and TVS1, and R2 and TVS1 are electrically connected to GND. D1 is electrically provided between LOUT1 of U1 and U1, and R4 is electrically connected between the NOUT terminal of U1 and U1. U1 is electrically connected to R3 and C3, and GND is electrically connected between U1 and C3.

[0019] As attached Figure 1 As shown, this circuit is the main power circuit of a commonly used charging gun / charging station on the market. L_in, N_in, and PE are the input terminals of the charging gun / charging station, and L_out, N_out, and GND are the output terminals of the charging gun / charging station. JD1 is the L-line control relay, JD2 is the N-line control relay, relay_ctrl1 is the control signal for whether relay1 is closed, and relay_ctrl2 is the control signal for whether relay2 is closed.

[0020] In this implementation scheme, JD3 and JD4 are specifically single-controlled double-pole relays.

[0021] In this embodiment, specifically, the multiple capacitors C1, C2, and C3 are connected in series or parallel.

[0022] In this embodiment, specifically, R1, R2, R3, and R4 are multiple resistors connected in series or parallel.

[0023] In this implementation scheme, specifically, U1 is a common unidirectional optocoupler.

[0024] In this embodiment, specifically, TVS1 is a TVS tube.

[0025] In this embodiment, specifically, VCC is a DC 12V power supply voltage.

[0026] In this embodiment, specifically, D1 is a common unidirectional diode.

[0027] In this implementation scheme, specifically, RLY_NCHK and RLY_LCHK are microcontroller detection signals.

[0028] Working principle

[0029] In this invention, under normal standby state, RLY_LCHK is low and RLY_NCHK is low, indicating that the relay is in its expected operating state. When the L-phase relay becomes stuck (i.e., the relay fails to disconnect when it should), the system's response is that RLY_LCHK becomes high and RLY_NCHK becomes low. If the N-phase relay becomes stuck, RLY_LCHK remains low, but RLY_NCHK will also become high. This state change can alert the system monitor to the relay problem. If both the L-phase and N-phase relays become stuck, RLY_LCHK remains high.

[0030] The level will be high, but RLY_NCHK will also become high. This indicates that the system has detected a serious fault because neither relay has disconnected as expected.

[0031] Any technical solution that achieves the above-mentioned technical effects by utilizing the technical solution described in this utility model, or by designing a similar technical solution inspired by the technical solution of this utility model, falls within the protection scope of this utility model.

Claims

1. A circuit for detecting and protecting single-channel relay adhesion, characterized in that, The single -way relay sticking detection and protection circuit, including relay control module, L item detection circuit module, N item detection circuit module, relay control module includes JD3, JD4, L item detection circuit module includes C1, C2, R1, R2, TVS1, N item detection circuit module includes R4, D1, U1, R3, C3, LOUT1 in the JD3 and the NOUT1 of JD4 are electrically connected LOUT1 of U1 respectively, LOUT in the JD3 and the NOUT of JD4 are electrically connected NOUT of U1 respectively and LOUT in the JD3 and the NOUT of JD4 are also electrically connected the input end of C1, C1 is electrically connected C2, C2 is electrically connected R1, and the output end of R1 is connected with R2 and TVS1 in parallel, and R2 and TVS1 are electrically connected GND respectively, and the LOUT1 between U1 and U1 is electrically connected with D1, and the NOUT end between U1 and U1 is electrically connected with R4, and U1 is electrically connected with R3 and C3 respectively, and GND is electrically connected between U1 and C3.

2. The stick- detection and protection circuit for a single pole relay of claim 1, wherein, The JD3, JD4 are single -way double -knife relay.

3. The stick- detection and protection circuit for a single pole relay of claim 1, wherein, The C1, C2, C3 are a plurality of capacitors series / parallel.

4. The stick- detection and protection circuit for a single pole relay of claim 1, wherein, The R1, R2, R3, R4 are a plurality of resistors series / parallel.

5. The stick- weld detection and protection circuit for a single pole relay of claim 1, wherein, The U1 is ordinary unidirectional photocoupler.

6. The stick- detection and protection circuit for a single pole relay of claim 1, wherein, The TVS1 is TVS tube.

7. The stick- weld detection and protection circuit for a single pole relay of claim 1, wherein, The D1 is ordinary unidirectional diode.

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