Protection circuit and control method of a single-channel DC electromagnet

Abstract

The invention discloses a protection circuit of a single channel direct current electromagnet and a control method.The protection circuit comprises an electromagnet driving circuit, a signal conditioning circuit, a switch circuit and a microcontroller, wherein the electromagnet driving circuit is connected with a switch protection circuit, the signal conditioning circuit and the microcontroller, receives driving signals of the microcontroller and drives an electromagnet EM to work; the signal conditioning circuit is connected with the microcontroller, collects voltage signals in the electromagnet driving circuit and outputs the voltage signals to the microcontroller; the switch circuit is connected with the microcontroller and switches on or switches off a power supply switch of the electromagnet EM under the control of the microcontroller; and the microcontroller sends pulse width modulation (PWM) driving signals to the electromagnet driving circuit, receives the voltage signals sent by the signal conditioning circuit and sends switch control signals to the switch circuit.The fault type can be detected quickly in first time after the occurrence of faults, the power supply is cut off timely before the electromagnet EM overheats, the safety of a power utilization device is guaranteed, and property damage and causality accidents are avoided.

Description

technical field [0001] The invention relates to the field of electromagnet circuits, in particular to a protection circuit and a control method for a single-channel DC electromagnet. Background technique [0002] The DC electromagnet has a simple structure and can realize inching control with a single switching element, so it is widely used in home appliances and industrial equipment. Since the electromagnet heats up obviously when it is energized, once the switching element is damaged and the power supply cannot be turned off, it may cause the electromagnet to overheat and burn, and even cause a fire in severe cases. In addition, the electromagnet will also encounter faults such as poor contact and open circuit damage of the switching element during use. Although it will not cause catastrophic consequences, it will affect the normal operation of the equipment, and it is not easy to diagnose quickly. [0003] Once the electromagnet driving circuit designed by relying on the...

AI Technical Summary

Problems solved by technology

Since the electromagnet heats up obviously when it is energized, once the switch element is damaged and the power supply cannot be turned off, it may cause the electromagnet to overheat and burn, and even cause a fire in severe cases.

In addition, the electromagnet will also encounter faults such as poor contact and open circuit damage of the switching element during use. Although it will not cause catastrophic consequences, it will affect the normal operation of the equipment, and it is not easy to quickly diagnose

[0003] Once the electromagnet drive circuit designed by relying on the existing technology fails during use, there is a risk of fault expansion

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