A Control Circuit for Improving the Response Speed ​​of Electromagnetic Contactor

Abstract

The invention relates to a control circuit for improving the response speed of an electromagnetic contactor. The control circuit is characterized by comprising a duplex winding electromagnetic coil, a controllable follow current circuit unit, a clamping follow current circuit unit, a coil driving circuit unit including semiconductor switch elements, a power supply circuit for quickly establishing a system and an integrated control unit circuit. The invention designs the control circuit for improving the response speed of the electromagnetic contactor, thereby ensuring that reverse overvoltage is eliminated or limited in a reliable security application range while a contactor product is quickly disconnected after a release order is received.

Description

technical field [0001] The invention belongs to the field of low-voltage electrical technology, and in particular relates to a control circuit for improving the response speed of an electromagnetic contactor. Background technique [0002] A contactor is an electrical appliance used for long-distance and frequent switching on and off of AC and DC main circuits and large-capacity control circuits. Its main control object is the motor, and it can also be used to control electric heating equipment, electric lighting, and electric welding machines. and electrical loads such as capacitor banks. The contactor has a high operating frequency, the highest operating frequency can reach 1200 times per hour. The life of the contactor is very high, the mechanical life is generally millions of times to 10 million times, and the electrical life is generally hundreds of thousands to millions of times. In the circuit, the contactor is not required to have the ability to break the short-circ...

AI Technical Summary

Problems solved by technology

[0004] Among them, the electromagnetic contactor usually controls the on and off of the main contact of the contactor product by applying an AC or DC voltage to the electromagnetic coil to generate a magnetic potential. However, since the electromagnetic coil is a strong inductive load, it will generate High voltage overshoot leads to disappearance of magnetic potential, so freewheeling is required to eliminate high voltage overshoot or limit high voltage overshoot within the safe tolerance range of the product or system

However, although freewheeling solves the technical problem of high-voltage overshoot, it makes the delay time of contactor disconnection longer.

The longer contactor off-delay time does not match the technical index of the main contact disconnection under the set fixed delay time after the contactor product receives the release command, the shorter the off-delay time, the better. The safety of contactor use

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