チョッパ兼用インバータ式点灯回路の設計

概要

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A ballast circuit with an inverter combined with a chopper is a circuit in which the inverter and chopper share at least one switching element. We have developed a ballast circuit with a newly designed dimming control circuit and drive circuit. Dimming control (Complementary PWM control) is achieved by making the continuity time of one switching ellement (Q_1) loger, while making the continuity time of the other switching element (Q_2) shorter, and vice versa. The drive circuit (self - excited and externally - excied multi - drive circuit with switching element Q_1) is self - exited by the feedback of the oscillating current from the resonance circuit, while switching element Q_2 is excied by the external signal. This circuit can run a pair of fluorescent lamps (FLR40S/M). An input power factor of 98% or more, a THD of 13% or less, and no substantial variation in the smoothed DC voltage were obtained under three conditions : full power (100% light output ratio), dimming level 1 (80% light output ratio), and dimming level 2 (55% light output ratio).
社団法人照明学会の論文
2001-02-01