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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,...
In this paper, A MCU-based electronic ballast for electrodeless fluorescent lamp (EFL) is implemented. The used two stage system consists of a power factor corrector and a class D resonant inverter. In addition, an 8-bit microcontroller is employed to act as the control core of the system to achieve digital control feature. Moreover, we not only discuss the lamp model, derive the frequency characteristics,...
This paper proposes a novel improved tweleve-phase with dummy load dimming control for backlight inverter. We adopt six-phase of tweleve-phase PWM dimming to control the brightness of twelve lamps. Each of odd phase can control two lamps. The other six even phases are connected to dummy load without lamp current. Circuit architecture is full bridge phase-shift circuit which can improve the total efficiency...
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 new zero-voltage-switching (ZVS) pulsewidth-modulated (PWM) single-phase inverter using a simple ZVS-PWM auxiliary commutation pole is presented in this paper. Except for the auxiliary switches, all active and passive semiconductor devices in the ZVS-PWM single-phase inverter operate at ZVS turn on and turn off. The auxiliary switches operate at zero-current-switching (ZCS) turned-on and turned-off...
This paper proposes a novel dimming control scheme which possesses six-phase PWM dimming control for backlight inverter. We adopt six-phase PWM dimming control circuit to control the brightness of twelve lamps. Each phase can control two lamps. Circuit architecture is full bridge circuit which can improve the total efficiency of the driving circuit. Because six-phase PWM dimming inverters consume...
This paper proposes two novel dimming control schemes which possess four-phase or six-phase PWM dimming control for backlight inverter. We adopt four-phase or six-phase PWM dimming control to control the brightness of twelve lamps. Each phase can control four or two lamps. Circuit architecture is full bridge phase-shift circuit which can improve the total efficiency of the driving circuit. Because...
This paper proposes a novel dimming control scheme which possesses six-phase PWM dimming control for backlight inverter. We adopt six-phase PWM dimming control circuit to control the brightness of twelve lamps. Each phase driving circuit can control two lamps. Circuit architecture is full bridge circuit which can improve the total efficiency of driving circuit. Due to single-phase PWM dimming consumes...
This paper proposes a novel control scheme which possesses four-phase PWM dimming control loop for backlight inverter. We adopt four-phase PWM dimming control circuit to control the brightness of twelve lamps. Each phase can control four or two lamps. Circuit architecture is full bridge phase-shift circuit which can improve the total efficiency of the driving circuit. From the experimental results,...
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...
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