A safety protection circuit of non-contact electronic relay

Abstract

The invention relates to a safety protection circuit of a non-contact electronic relay, which belongs to the field of electronic relays. It includes fast fuse, main switch circuit, self-destruct protection circuit, etc. Its characteristics are: when the high-side switch is working, the input terminal of the self-destruct protection circuit is connected with the isolation drive circuit, and the output terminal is connected in parallel with the main switch circuit and DC load; The isolated drive circuit is connected to the main switch circuit through the control switch and the fast fuse; it is applied to the self-destruct protection circuit when the low-side switch is working, the input terminal of the main switch circuit is connected in parallel with the control switch, and the output terminal of the main switch circuit is connected to the DC load. The input end of the destruction protection circuit is connected to one end of the DC load through a control switch and a fast fuse, and its output end is connected to the other end of the DC load. Ensure that the switch tube breaks down and quickly self-destructs and quickly breaks away from the main circuit to prevent the load from igniting. It solves the problem that the prior art has no self-breakdown protection circuit, which causes the electronic relay to run out of control and burn the load, wiring harness and storage battery.

Description

technical field [0001] The invention relates to a safety protection circuit of a non-contact electronic relay, belonging to the technical field of non-contact electronic relays. Background technique [0002] Electronic relays have the characteristics of long service life, strong reliability, high contact sensitivity, no spark interference, low control power, and fast switching speed, and have broad market application prospects. However, in fact, in the fields of starting relays, preheating relays, and horn relays for vehicles, electromagnetic relays with contacts still occupy a dominant position. One of the reasons is that the switch power tube that replaces the contact has a large tube pressure drop, and the power consumption and heat generation after conduction are large, and it is easy to be broken down. Once it is broken down and the short circuit fails, it is equivalent to the contact adhesion of the electromagnetic relay. , the consequences are very serious. [0003]...

AI Technical Summary

Problems solved by technology

[0007] The purpose of the present invention is to provide a switch power tube that can ensure rapid self-destruction after breakdown and out of control, quickly break away from the main circuit, and avoid smoke and fire accidents in the load circuit; The safety protection circuit of the non-contact electronic relay that wears out the protection circuit, causes the electronic relay to be out of control, burns the load, and even the battery problem

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