Electronic ballast of light-adjustable high strength gas discharge lamp

Abstract

The electronic ballast of an illuminance adjustable discharge lamp with high power of this invention comprises a main circuit and a controlling circuit or a main circuit, a controlling circuit and an igniting circuit. The main circuit comprisises a power factor correcting unit, a half-bridge inverse-converter and a resonance circuit, the controlling circuit comprises an illuminance adjusting signal circuit and a driving circuit, wherein the resonance circuit includes a capacitor C1, a inductor L1, a capacitor C2, a inductor L2 (or a transformer T1) and a gaseous discharge lamp with high power; one end of the capacitor C1 is connected to the connecting points of two switching transistors of the half-bridge inverse-converter, the other end is connected to one end of the inductor L1.

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. There are two main types of existing dimming electronic ballasts, one includes the main circuit and control circuit, this kind of ballast uses the resonant circuit to generate high voltage for ignition, no additional ignition circuit is needed, the other includes the main circuit, control circuit The main circuit of these two dimming electronic ballasts includes a power factor corrector, a half-bridge inverter, and a series resonant circuit composed of inductors, capacitors, and lamps connected in series or in parallel. The control circuit includes a regulator Optical signal circuit and drive circuit. When working, the mains power enters the resonant circuit through the power factor corrector and the half-bridge inverter or enters the...

AI Technical Summary

Problems solved by technology

When these two electronic ballasts are used for frequency modulation and dimming, the lamp power is adjusted by changing the impedance value of the inductance of the series resonant circuit by adjusting the frequency. In order to obtain the required dimming range, a wide frequency modulation range (up to several times) is required. ), the circuit frequency is very high when entering deep dimming, and the circuit efficiency decreases. At the same time, as the frequency increases, the lamp current crest factor increases, which will affect the life of the lamp. Such a wide frequency range also poses a challenge to the design of magnetic components. challenge

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