Bypass type 220V power grid electric dazzling prevention device and control method thereof

Abstract

The invention provides a bypass type 220V power grid electric dazzling prevention device and a control method of the bypass type 220V power grid electric dazzling prevention device. The device comprises an alternating current to direct current energy storage unit, a single-chip microcomputer control and display unit and an inverter output unit. The alternating current to direct current energy storage unit comprises a rectifying circuit, an energy storage control circuit and a rapid energy storage circuit. The single-chip microcomputer control and display unit comprises a single-chip microcomputer, a direct current voltage reduction module circuit and an energy storage voltage detection circuit. The inverter output unit comprises a high-frequency PWM generation circuit, a high-frequency transformer output circuit, a transformer output full-bridge rectifying circuit, a PWM generation circuit, a PWM drive and full-bridge inverter circuit, a 220V power grid zero crossing point detection circuit, a 220V power grid voltage detection circuit, a 220V power grid and inverter alternating current switch circuit and a signal interface circuit. According to the bypass type 220V power grid electric dazzling prevention device and the control method, the inverter type bypass working method is adopted, the structure of a contactor is not changed, normal work of the contactor is not affected, the impact problem does not exist, the bypass type 220V power grid electric dazzling prevention device has universality for all contactors, cost is reduced, and system reliability is improved.

Description

technical field [0001] The invention belongs to the field of automatic control of electric power systems, and in particular relates to a bypass type 220V power grid anti-shaking device and a control method thereof. Background technique [0002] During the normal power supply process of the power grid, due to short-circuit faults, reclosing caused by lightning weather, and the start-up of large-capacity equipment, the voltage of the power grid will be unstable for a short time, that is, the phenomenon of swaying electricity. For AC contactors that control low-voltage motors, when the system voltage cannot meet its self-maintenance requirements, it will be released abnormally, causing direct damage to continuous production, and even posing a threat to personal safety. [0003] In view of the AC contactor tripping problem caused by the swaying phenomenon, we can start from the following aspects, one is to improve the performance of the contactor, the other is to add a set of co...

AI Technical Summary

Problems solved by technology

Firstly, the first two improvement methods will increase the cost of purchasing devices; moreover, there are fewer manufacturers with high production performance or contactors with control devices, and the choice for enterprises is small; secondly, the tripping and restarting control method has impact, which brings Damage caused by equipment operation

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