Electronic ballast of light-adjustable high strength gas discharge light
A technology of gas discharge lamps and electronic ballasts, which is applied in the use of gas discharge lamps, light sources, electric light sources, etc., and can solve the problems of detrimental lamp life, not very wide dimming range, anti-interference, and adverse effects on efficiency , to achieve wide dimming range and prolong life
Inactive Publication Date: 2006-06-28
ZHEJIANG UNIV
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AI Technical Summary
Problems solved by technology
High lamp current crest factor damages lamp life, so this kind of dimming electronic ballast is not suitable for duty cycle dimming
However, for frequency modulation and dimming, a wide frequency modulation range is required to obtain the required dimming range, which has adverse effects on anti-interference and efficiency.
For voltage regulation and dimming, due to the limitation of the output voltage range of the power factor corrector, the dimming range is not very wide
Method used
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[0015] refer to figure 1 , the dimming type electronic ballast for high-intensity gas discharge lamps of the present invention includes a main circuit, a control circuit and an ignition circuit 5, the main circuit includes a power factor corrector or a rectifier circuit 1, an inverter 2 and has a transformer T1 and a high-intensity The resonant circuit 3 composed of the gas discharge lamp L, the control circuit includes the dimming signal circuit 4 and the driving pulse generating circuit 6, and the utility power supplies the lamp with alternating current through the power factor corrector or the rectifier circuit, the inverter input resonant circuit and the ignition circuit And the starting high voltage is provided to the lamp through the transformer, and the dimming signal output by the dimming signal circuit controls the switching tube of the inverter to work through the driving pulse generating circuit. The inverter 2 of the main circuit includes capacitors C1, C2 and swit...
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THe electronic ballast of the gaseous discharge lamp with high power of illuminance adjusting type disclosed by this invention is used for adjusting the illuminance in the mark-space ratio, comprising a main circuit, a controlling circuit and a igniting circuit. The main circuit includes a power factor correcting unit or a rectifying circuit, an inverse-converter and a resonance circuit consisting of the transformer T1 and the gaseous discharge lamp with high power power; the controlling circuit includes a illuminance adjusting signal circuit and a driving pulses generating circuit. This invention can achieve very wide illuminance adjusting range based on the premise of the constant operating frequency and the constant voltage of the main leads while the wave peak factor of the lamp current can be controlled in a lower range during adjusting the illuminance, being advantageous to prolonging the life of the lamp.
Description
technical field [0001] The invention relates to an electronic ballast for a high-intensity gas discharge lamp. Background technique [0002] Compared with inductive ballasts, electronic ballasts can be easily dimmed. The existing dimming electronic ballast includes a main circuit, a control circuit and an ignition circuit. The main circuit includes a power factor corrector or a rectifier circuit, a half-bridge inverter composed of two switching tubes, and a transformer and a high-intensity gas discharge circuit. The resonant circuit composed of lamps, the control circuit includes a dimming signal circuit and a driving pulse generating circuit. Mains electricity is input into resonant circuit and ignition circuit through power factor corrector or rectifier circuit, half-bridge inverter, and supplies AC power to the lamp and high voltage to start the lamp through transformer, and the dimming signal output by the dimming signal circuit passes through ...
Claims
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IPC IPC(8): H05B41/288H05B41/392
CPCY02B20/204Y02B20/00
Inventor 沈淼森钱照明
Owner ZHEJIANG UNIV