Alternating current overload detection protection circuit

Abstract

The invention relates to an alternating current overload detection protection circuit which comprises an acquisition circuit, an MCU, a resistor, an optocoupler, a silicon controlled rectifier, a load resistor and a loop protection relay. According to the invention, the MCU is utilized to acquire a voltage signal and a preset voltage threshold value for preliminary comparison, when the acquired voltage signal is greater than the preset voltage threshold value, the optocoupler starting signal is output to output the cut-off signal to the silicon controlled rectifier through the optocoupler so that the silicon controlled rectifier is switched from an initial conduction state to a cut-off state, and the effects of high-speed detection and instantaneous protection are realized; and the circuit has the characteristics of small size, low cost, simple circuit, high reliability and the like.

Description

technical field [0001] The invention relates to the technical field of overload detection and protection circuits, and belongs to an alternating current overload detection and protection circuit. Background technique [0002] At present, the AC current overload protection circuit is composed of a single component such as a fusible fuse, a self-resetting fuse, an air circuit breaker or an overheating circuit breaker, or a combination of multiple components. In actual use, some components are disposable. New parts must be replaced, such as fuses; some parts can be used repeatedly, but the response cycle is relatively long, and the back-end circuit cannot be protected in time, such as an overheating circuit breaker; some parts are not adjustable to overload sensitivity and are expensive to use, such as air short circuit switches . At present, there is an urgent need for an AC current overload monitoring and protection circuit with simple circuit structure, low cost, high relia...

AI Technical Summary

Problems solved by technology

[0002] At present, the AC current overload protection circuit is composed of a single component such as a fusible fuse, a self-resetting fuse, an air circuit breaker or an overheating circuit breaker, or a combination of multiple components. In actual use, some components are disposable. New parts must be replaced, such as fuses; some parts can be used repeatedly, but the response cycle is relatively long, and the back-end circuit cannot be protected in time, such as an overheating circuit breaker; some parts are not adjustable to overload sensitivity and are expensive to use, such as air short circuit switches

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