Bypass type 220V grid voltage sag prevention device and control method therefor

摘要

Provided are a bypass type 220V grid voltage sag prevention device and a control method therefor. The bypass type 220V grid voltage sag prevention device comprises an AC-to-DC energy storage unit, a Single Chip Microcomputer (SCM) control and display unit, and an inverter output unit. The AC-to-DC energy storage unit comprises a rectifier circuit, an energy storage control circuit and a quick tank circuit; the SCM control and display unit comprises an SCM, a DC step-down module circuit and an energy storage voltage detecting circuit; and the inverter output unit comprises a high-frequency PWM generating circuit, a high-frequency transformer output circuit, a transformer output full-bridge rectifier circuit, a PWM generating circuit, a PWM driving and full-bridge inverter circuit, a 220V grid zero-cross point detecting circuit, a 220V grid voltage detecting circuit, a 220V grid and inversion AC converting circuit, and a signal interface circuit.

主权项

1. A bypass type 220V grid voltage sag prevention device, comprising:
an AC-to-DC energy storage unit, comprising a rectifier circuit, an energy storage control circuit and a tank circuit; wherein an input end of the rectifier circuit is connected with a 220V grid, an output end of the rectifier circuit is connected with the input end of the energy storage control circuit, and the output end of the energy storage control circuit is connected with the input end of the tank circuit; a Single Chip Microcomputer (SCM) control and display unit, comprising an SCM, a DC step-down module circuit and an energy storage voltage detecting circuit; wherein the input end of the energy storage voltage detecting circuit is connected with one output end of the tank circuit, the output end of the energy storage voltage detecting circuit is connected with a signal input end of the SCM, the input end of the DC step-down module circuit is connected with one output end of the rectifier circuit, the control output end of the SCM is connected with the input end of the energy storage control circuit, and the power supply port of the SCM is connected with the output end of the DC step-down module circuit; and an inverter output unit, comprising a PWM generating circuit, a transformer output circuit, a transformer output full-bridge rectifier circuit, a PWM generating circuit, a PWM driving and full-bridge inverter circuit, a 220V grid zero-cross point detecting circuit, a 220V grid voltage detecting circuit, a 220V grid and inversion AC converting circuit, and a signal interface circuit; wherein, the input end of the PWM generating circuit is connected with the output end of the quick tank circuit, one output end of the PWM generating circuit is connected with the input end of the DC step-down module circuit, the other output end of the PWM generating circuit is connected with one input end of the transformer output circuit, the other input end of the transformer output circuit is connected with the output end of the quick tank circuit, the output end of the transformer output circuit is connected with the input end of the transformer output full-bridge rectifier circuit, the output end of the transformer output full-bridge rectifier circuit is connected with one input end of the PWM driving and full-bridge inverter circuit, the output end of the PWM driving and full-bridge inverter circuit is connected with one input end of the 220V grid and inversion AC converting circuit, the other two input ends of the PWM driving and full-bridge inverter circuit are respectively connected with the output end of the PWM generating circuit and an enable port of the SCM, the input end of the PWM generating circuit is connected with the signal output port of the SCM, the other two input ends of the 220V grid and inversion AC converting circuit are respectively connected with the signal output end of the SCM and the 220V grid, the output end of the 220V grid and inversion AC converting circuit is connected with a load, the input end of the 220V grid zero-cross point detecting circuit and the input end of the 220V grid voltage detecting circuit are respectively connected with the 220V grid, and the output end of the 220V grid zero-cross point detecting circuit and the output end of the 220V grid voltage detecting circuit are respectively connected with different signal input ends of the SCM.