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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...
A resonant backlight inverter with double-ended driving and primary-side control are proposed to reduce the thermometer effect and leakage current effect in LCD. In this paper, the mathematical model of the lamp current including the parasitical capacitance in LCD panel is conducted to explore the influence of leakage current effect. Moreover, the primary-side control and the DPLL function are integrated...
A high voltage full-bridge resonant inverter is proposed for driving carbon nanotube field emission lamp (CNTL). First, we construct an equivalent model of CNTL to exhibit its electric characteristics. Moreover, the high frequency sinusoidal driving strategy is employed to eliminate the arcing phenomenon caused by the traditional DC driving. And then the PLL feedback controller is used to stabilize...
A microcontroller-based backlight module is proposed to reduce the leakage current effect in LCD. First, the mathematical model of the parasitical capacitance in LCD panel is conducted to explore the influence of leakage current effect. Moreover, a class D resonant backlight inverter is employed to act as the main circuit. Next, the phase angle variations caused by the parasitic capacitances is considered...
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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