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This paper proposes a new isolated single-stage single-switch power-factor-correction (S4 PFC) driver for supplying light-emitting diodes (LEDs) without electrolytic capacitor. In the proposed LED driver, the switch turns on under zero current switching (ZCS) condition. Also, it turns on at a voltage less than its nominal voltage stress, and therefore, the switch capacitive turn-on loss decreases...
A new interleaved high step-up DC-DC converter is presented in this paper. Coupled inductors with series secondary windings are used in order to minimize the input current ripple and extend the voltage gain. Passive clamp capacitors are used to absorb the leakage energy and recycle it to the output. Thus, the voltage stress across switches is low and efficiency is improved. Due to charge-balance of...
This paper proposes an interleaved zero voltage transition (ZVT) PWM buck converter. The proposed converter consists of two identical buck converter modules and an auxiliary circuit. The auxiliary circuit provides zero voltage switching condition for the main switches. Also, zero current switching condition for the auxiliary switch and diodes is achieved. The interleaved buck converter with the proposed...
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