Huang-Jen Chiu

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This paper presents a dimmable light-emitting diode (LED) driver with adaptive feedback control for low-power lighting applications. An improved pulsewidth modulation dimming technique is studied for regulating the LED current and brightness. Under universal input voltage operation, high efficiency and high power factor can be achieved by a coupled inductor(More)
Two bistable multivibrators based on the operational transresistance amplifier (OTRA) are presented. The first topology consists of only one OTRA and a positive feedback network. The second multivibrator utilises a single-pole double-throw (SPDT) switch along with a bias voltage source to shift the hysteresis loop into either the right-half-part or the(More)
A high-efficiency digital-controlled interleaved dc–dc converter is designed and implemented to provide a regulated high voltage output for high-power proton-exchange-membrane fuel-cell applications. Ripple cancellation on input current and output voltage can be achieved by the studied interleaved dc–dc power conversion technique to reduce hysteresis energy(More)
A new controller for eliminating the temperature effect of a piezoelectric transformer (PT) in a backlight electronic ballast is proposed in this paper. First, a class-D backlight inverter is employed to simplify the circuit configuration and to raise system efficiency. Next, to reduce the dimensions of the backlight module for satisfying the thin-shaped(More)