Hot start ballast and low-frequency full bridge circuit of metal halide lamp

Abstract

The invention discloses a hot start ballast and low-frequency full bridge circuit of a metal halide lamp. The hot start ballast and low-frequency full bridge circuit comprises a filter circuit, a flyback transformation circuit, a controller, an auxiliary power supply circuit, a low-frequency full-bridge circuit, a driving circuit and an ignition unit, wherein the input end of the filter circuit is connected with a low-voltage DC input power supply, the output end of the filter circuit is connected with the flyback transformation circuit, and the controller is connected with the flyback transformation circuit. According to the invention, ignition can be realized in the low-frequency voltage, so that the metal halide lamp can be lightened when the lamp is hot, practical using requirements are met, service life of a metal halide lamp bulb is ensured, and use is realized effectively; and the single-end flyback transformation circuit works in the continuous work mode, so that the conduction EMI noise ratio is greatly reduced; and the duty ratio is adjusted, and power-constant work and circuit protection can be realized rapidly in the precise power-constant control process.

Description

technical field [0001] The invention relates to the technical field of a power supply, in particular to a hot-start ballast for a metal halide lamp and a low-frequency full-bridge circuit. Background technique [0002] At present, the metal halide lamp is the abbreviation of the metal halide lamp. The metal halide lamp is a discharge lamp that works on an AC power source and generates arc discharge in the mixed vapor of mercury and rare metal halide. The metal halide lamp is a high-pressure mercury lamp. Based on the third-generation light source made by adding various metal halides, it is widely used in the lighting of stadiums, exhibition centers, large shopping malls, industrial plants, street squares, stations, docks and other places. Although the service life of metal halide lamps is about 20,000 hours less than that of LEDs, its cost is much lower than that of LEDs, and in the actual use of LED lamps, because the lifespan of the external circuit is much lower than the ...

AI Technical Summary

Problems solved by technology

Although the service life of metal halide lamps is about 20,000 hours less than that of LEDs, its cost is much lower than that of LEDs, and in the actual use of LED lamps, because the lifespan of the external circuit is much lower than the actual lifespan of LEDs, The overall service life of LED lamps is short, not even 10,000 hours; therefore, metal halide lamps have the advantages of high luminous efficiency, high color rendering index, low cost, and long service life, and are ideal light sources for large-scale lighting

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