A bypass-type fast AC-DC switching device for preventing contactor shaking

Abstract

The invention discloses a bypass-type fast AC-DC switching device for preventing contactor swaying electricity, which includes an AC 220V to DC 15V low-ripple step-down circuit, a supercapacitor charging and discharging circuit, a system fast power-on switching circuit, and a detection of AC 220V Attenuation voltage value and positive and negative half-wave judgment circuit, AC-DC voltage mutual fast switching circuit, dry contact output circuit, internal bypass relay circuit and single-chip microcomputer, when the mains shakes or abnormally interrupts, the device can be uninterrupted Provide direct current, and at the same time, the output port can also shield the dry contact signal given by the frequency converter. It can also be connected to an external 12V DC relay. When the device fails, it can be connected to the internal bypass relay at the same time to ensure that other equipment circuits can still be normal after the device fails. Work. The device can protect the non-stop equipment on the industrial site, and has the characteristics of small size, fast charging, long service life, fast switching speed, and the same AC phase cut-in and cut-off.

Description

Technical field[0001]The invention relates to the technical field of electrical equipment, in particular to a bypass type fast AC / DC switching device for preventing contactor shaking.Background technique[0002]During the operation of the power system in the factory, the grid voltage often drops and returns to normal due to lightning strikes, short-circuits to the ground, fault reclosing, automatic switching of backup power, abnormal grids, and startup of large equipment. The phenomenon that the voltage fluctuates greatly at a moment or the power is restored is called the voltage sag phenomenon, also called the electric shock.[0003]The phenomenon of electric shock is catastrophic for enterprises that require a large number of equipment in continuous production to not allow the motor to trip and stop in the process. From the economic loss, reducing the production efficiency, and from the fire, explosion and even personal safety. The existing AC contactors on the market cannot maintain ...

AI Technical Summary

Problems solved by technology

For this kind of contactor coil not pulling in due to "swaying electricity", the conventional microprocessor self-starting equipment is powerless, because the failure time is less than the voltage acquisition cycle time of the microprocessor and cannot be identified

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