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Relay adhesion and output short circuit detection circuit

A technology for detecting circuit and output short-circuit, which is applied in circuit breaker testing, instrumentation, and electrical measurement. It can solve problems such as relay short-circuit accidents, equipment safety hazards, and relay adhesion. It is easy to implement, low in cost, and simple in overall circuits. Effect

Pending Publication Date: 2021-03-16
上海亮一科技有限公司
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  • Abstract
  • Description
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  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the characteristics of the relay, it may not be disconnected normally in the application scenario of high current. This situation is called relay sticking, which will bring safety hazards to the equipment.
In addition, before the relay is closed, the short circuit of the output terminal will cause a short circuit accident when the relay is closed, so it is necessary to check whether the output circuit is normal before the relay is closed

Method used

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  • Relay adhesion and output short circuit detection circuit
  • Relay adhesion and output short circuit detection circuit

Examples

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Embodiment Construction

[0019] Attached below figure 2 The illustrated examples further describe the invention.

[0020] attached figure 2 Among them, K1 and K2 are two relays controlled by the output of the AC charging pile, which respectively control the on-off of the live wire (L wire) and the neutral wire (N wire).

[0021] The output L_out of the working circuit relay K1 is connected to the positive pole of the diode D1, the negative pole of D1 is connected to the positive pole of the input side of the optocoupler U1 (pin 1 of U1), the negative pole of the input side of U1 (pin 2) is connected to the resistor R1, and the other end of R1 is connected to the relay The output terminal of K3 (pin 3), the other pin 4 of the output of K3 is connected to the power input N_in; the power input L_in is connected to the positive pole of the diode D2, and the negative pole of D2 is connected to the positive pole of the input side of the optocoupler U2 (pin 1 of U2 ), the negative pole of U2 input side (...

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Abstract

The invention relates to a relay adhesion and output short circuit detection circuit, which is mainly used for detecting whether a relay is adhered or not, so that the circuit cannot be normally disconnected, potential safety hazards are caused, and short circuit accidents caused by closing the relay during output short circuit are avoided. The method is especially suitable for output control detection of the charging pile. The detection circuit is mainly composed of a detection control relay, a current-limiting resistor, a rectifier diode, an optocoupler and a single-chip microcomputer used for controlling the detection controller relay and identifying output signals of the optocoupler. The relay adhesion state can be rapidly and safely detected, whether relay output is short-circuited ornot can be detected, and the scheme is simple in circuit, low in cost and convenient to popularize and implement.

Description

technical field [0001] The invention belongs to the field of strong current detection, and mainly solves the problem of accidental adhesion that may occur when relays and similar products are used in high-current links, thereby causing potential safety hazards. Background technique [0002] With the widespread use of power equipment, more and more heavy-duty equipment needs to be switched on and off through intelligent control. Relays are a very good choice. However, due to the characteristics of the relay, it may not be disconnected normally in a high-current application scenario. This situation is called relay sticking, which will bring safety hazards to the equipment. In addition, before the relay is closed, the short circuit of the output terminal will cause a short circuit accident when the relay is closed, so it is necessary to check whether the output circuit is normal before the relay is closed. Contents of the invention [0003] The purpose of the present inventi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R31/327
CPCG01R31/3275
Inventor 周宏亮
Owner 上海亮一科技有限公司
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