Alternating current overload detection protection circuit

A protection circuit, overload detection technology, applied in the direction of protection against overcurrent, etc., can solve the problems of inability to protect the back-end circuit in time, the overload sensitivity is not adjustable, the response period is long, etc., to achieve flexible on-off strategy, low cost , the effect of high reliability

Inactive Publication Date: 2021-05-07
苏州工业园区天和仪器有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

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

Method used

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  • Alternating current overload detection protection circuit

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Embodiment Construction

[0027] The technical solutions of the present invention will be clearly and completely described below in conjunction with the accompanying drawings. Apparently, the described embodiments are some of the embodiments of the present invention, but not all of them. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.

[0028] In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer" etc. The orientation or positional relationship indicated is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientatio...

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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...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02H3/08
CPCH02H3/08
Inventor 范梵
Owner 苏州工业园区天和仪器有限公司
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