Power-down control conversion circuit

Abstract

A power-down control conversion circuit comprises an MCU single chip machine control circuit, a commercial power input sampling circuit, a bypass static switch and an inverting static switch. The MCU single chip machine control circuit outputs a bypass control signal to control the conduction and the cut-off of the bypass static switch installed between a commercial power input end and an alternating current output end, and also outputs an inverting control signal to control the conduction and the cut-off of the inverting static switch installed between a UPS inverter and an alternating current input end, and then inputs a sampling signal of the commercial power input sampling circuit; and the circuit is characterized in that the commercial power input sampling circuit comprises a commercial power input sine wave amplitude sampling circuit and a commercial power input sine wave frequency sampling circuit; accordingly, the sampling signal comprises an amplitude sampling signal and a frequency sampling signal. The invention realizes the detection of inputting super high speed short power-down through dual sampling method of measuring the amplitude and the frequency of the input voltage waveform simultaneously, and has the characteristics of simple technique, stable circuit performance and low cost.

Description

Technical field: [0001] The invention relates to a special power supply for fire-fighting emergency lamps, and a power-down control conversion circuit for converting bypass output and inverter output Background technique: [0002] The switching time between bypass output and inverter output is about 10-250 milliseconds for general fire emergency lamps, which cannot meet the requirements of high-pressure sodium lamps on the market. Sodium lamps will go out when the power bypass and inverter switching time exceeds 3.5 milliseconds. , once it goes out, it takes about 2 minutes to turn it back on. Ordinary special power supplies for fire emergency lighting cannot meet the lighting requirements of venues and tunnels at all. Invention content: [0003] The purpose of the present invention is to overcome the deficiencies of the prior art, to propose a power-down control conversion circuit, under the premise of ensuring the stability of the power supply, shorten the intermittent ...

AI Technical Summary

Problems solved by technology

[0002] The switching time between bypass output and inverter output is about 10-250 milliseconds for general fire emergency lamps, which cannot meet the requirements of high-pressure sodium lamps on the market. Sodium lamps will go out when the power bypass and inverter switching time exceeds 3.5 milliseconds. , it takes about 2 minutes to light up again once it goes out

Ordinary special power supplies for fire emergency lighting cannot meet the lighting requirements of venues and tunnels at all

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