Ballast

Abstract

The invention discloses a ballast, relating to the improvement of a ballast structure, and aiming to provide a ballast which has simple circuit and can eliminate acoustical resonance and improve the power factor of a circuit. The ballast comprises a shell and is characterized in that the shell is internally provided with an anti-jamming passive filter, a passive power factor correction circuit, a half-bridge type high-frequency changing circuit and an LC serial resonance circuit / drive circuit, wherein the anti-jamming passive filter is connected with an AC power supply; the AC power supply is connected with the output end of the anti-jamming passive filter and used for converting alternating current into direct current; the passive power factor correction circuit is used for improving the power factor of the circuit; the half-bridge type high-frequency changing circuit is connected with the passive power factor corrector circuit and used for suppressing the acoustical resonance of a high-intensity discharge lamp; and the LC serial resonance circuit / drive circuit is connected with the half-bridge type high-frequency changing circuit and used for improving repeated starting voltage.

Description

Technical field: [0001] The present invention relates to the improvement of ballast structure. Background technique: [0002] At present, high-frequency electronic ballasts for ordinary fluorescent lamps are very common, but for high-intensity gas discharge lamps, including high-pressure mercury lamps, high-pressure sodium lamps and metal halide lamps, the problem is much more complicated when using high-frequency electronic ballasts. One of them is acoustic resonance, which causes the arc in the high-intensity discharge lamp to vibrate, and the light output fluctuates continuously. At the same time, the color temperature of the lamp also changes, and in severe cases, the arc is extinguished. At present, although various methods to avoid acoustic resonance have been proposed at home and abroad, such as frequency modulation method, lamp voltage and lamp current negative feedback method, low-frequency square wave lighting method, etc., they cannot be popularized and used becau...

AI Technical Summary

Problems solved by technology

[0002] At present, high-frequency electronic ballasts for ordinary fluorescent lamps are very common, but for high-intensity gas discharge lamps, including high-pressure mercury lamps, high-pressure sodium lamps and metal halide lamps, the problem is much more complicated when using high-frequency electronic ballasts. One of them is acoustic resonance, which causes the arc in the high-intensity gas discharge lamp to vibrate, and the light output fluctuates continuously. At the same time, the color temperature of the lamp also changes, and in severe cases, the arc is extinguished.

At present, although various methods to avoid acoustic resonance have been proposed at home and abroad, such as frequency modulation method, lamp voltage and lamp current negative feedback method, low-frequency square wave lighting method, etc., but due to the complexity of the circuit and the difficulty in practical application, they cannot be popularized and used.

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