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A burst dimming controller with primary-side control for electrodeless fluorescent lamp (EFL) electronic ballast is implemented in this paper. The used main circuit is a class D topology with a resonant circuit to form a resonant inverter. Moreover, an 8-bit microcontroller is employed to act as the control core of the system to achieve soft start, burst dimming, and primary-side control feature....
A microcontroller-based electronic ballast for electrodeless fluorescent lamp (EFL) is implemented in this paper. The main circuit consists of a class D converter and a resonant circuit to form a resonant inverter. In addition, an 8-bit microcontroller is employed to act as the control core of the system to achieve soft start and smooth dimming feature. Moreover, we not only discuss the lamp model,...
This paper proposes a novel control scheme which possesses four-phase PWM dimming control for backlight inverter with triple output lamp currents for each phase. We adopt four-phase PWM dimming control circuit to control the brightness of twelve lamps. Each phase driving circuit can control three lamp currents. Circuit architecture is full bridge phase-shift circuit which can improve the total efficiency...
This paper proposes a current-balancing technique to equalize the driving currents for multiple cold-cathode fluorescent lamps (CCFLs) by modulating the fundamental components and harmonics in each lamp currents. First, we adopt a class D resonant inverter as the main circuit. Next, we introduce an averaging circuit incorporating the PWM control to form a new current-sharing controller, where the...
This paper proposes a novel single-stage high-power-factor electronic ballast with symmetrical half-bridge topology for fluorescent lamps. The proposed electronic ballast only uses a symmetrical half-bridge topology to procure the functions of a boost power-factor-correction converter and a half-bridge series parallel-loaded inverter. In spite of its simplicity, an excellent performance concerning...
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