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This paper introduces technologies of the dimmable electronic ballast for metal-halide lamps (MHLs). The topology structure of the ballast includes AC/DC converter, DC/DC converter, DC/AC inverter, even dimming and protection functions that can be applied in many kinds of MHLs. The output power of the ballast is stably by means of feedback of the current from the lamp. Especially, the light intensity...
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