Multifunctional circuit for controlling and protecting switching apparatus

Abstract

The invention discloses a multifunctional circuit for controlling and protecting a switching apparatus, which comprises a microprocessor circuit, a signal sampling and processing circuit, a short-circuit detection circuit, a tripping electromagnet drive circuit, a control electromagnet drive circuit and a power supply conversion circuit for supplying power supply to the circuits, wherein the input end of the short-circuit detection circuit is connected with the sampling and processing circuit, while the output end is connected with the tripping electromagnet drive circuit so as to judge a current signal from the signal sampling and processing circuit and control the action of the tripping electromagnet drive circuit. The multifunctional circuit for controlling and protecting the switchingapparatus provided by the invention can quickly output control and protection signals and has high anti-interference capability.

Description

technical field [0001] The invention relates to a circuit for controlling and protecting switching appliances, in particular to a multifunctional circuit for controlling and protecting switching appliances, which belongs to the technical field of low-voltage electrical appliances. Background technique [0002] Control and protection switching devices are an important product in the field of low-voltage electrical appliances. This product integrates the control and protection functions of switching devices, and has the advantages of small size and strong functions. [0003] At present, some control and protection switchgears in China use bimetal thermal magnetic protection, which has the problems of less protection function, poor precision and unstable operation. Some control and protection switching appliances in China use electronic methods for protection, but they do not detect and output short-circuit faults through analog circuits. The short-circuit judgment is performed...

AI Technical Summary

Problems solved by technology

This transmission method uses the microprocessor to determine the short circuit, and the determination time is long, which leads to the problem of long delay of the output action signal.

In addition, this circuit cannot control the control electromagnet of the control and protection switchgear. It only has the protection function (driving the magnetic flux converter) and has no control function (controlling the opening and closing of the electromagnet), so there are functional defects.

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