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In this paper, an architecture of a single-stage power factor corrected AC-DC converter controlled by a high voltage resonant controller IC L6598 is proposed as LED street lighting driver. The converter is formed by the integration of two boundary conduction mode (BCM) boost circuits and a half-bridge LLC resonant circuit. The converter adapts dual half-wave rectifiers at the output side that supply...
Conventional AC/DC LED drivers require a large energy storage capacitor at the output to provide a constant current to the LEDs. In order to minimize the size and cost of the driver circuit, electrolytic capacitors are conventionally used due to its high energy density and low cost. However, electrolytic capacitors are sensitive to operating temperature and have much shorter lifetime than the LED...
In this paper, a novel single-stage ac/dc converter for micro-scale wind power generation system is proposed. The power factor correction of input line currents for wind power is achieved so as to reduce the harmonic currents and decrease the noise of three-phase wind turbine. The proposed converter has both zero-voltage switching in the primary-side switches and zero-current switching in the secondary-side...
This paper proposes a novel soft-switched auxiliary resonant circuit to provide a Zero-Voltage-Transition turn-on switching for a conventional PWM boost converter in a PFC application. The proposed auxiliary circuit enables a main switch of the boost converter to turn on under a zero voltage switching conduction and simultaneously achieves both soft switched turn-on and turn-off. Moreover, for the...
This paper presents a modified Valley-Fill (VF) ballast circuit to combine with a current fed resonant inverter as the power circuit for a high power factor VF electronic ballast. The original VF circuit permit input current conduction from 30° to 150°, and then from 210° to 330°. Due to this discontinuity, high total harmonic distortion (THD) results into the input current waveform. The modified...
Recently, it has been established that the problem of power factor compensation for nonlinear loads with non-sinusoidal source voltage can be recast in terms of the property of cyclo-dissipativity. Using this framework the classical capacitor and inductor compensators can be interpreted in terms of energy equalization. Unfortunately, the supply rate is a function of the load, which is usually unknown,...
A new soft switching boost converter is proposed in this paper. The conventional boost converter generates switching losses at turn on and off. Because of those, the whole system efficiency is reduced. The proposed converter utilizes soft switching method using an auxiliary switch and resonant circuit. Therefore, the converter reduces switching losses lower than the hard switching. The proposed soft...
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