A novel ZVT PWM Cuk power-factor corrector

Abstract

A novel zero-voltage-transition (ZVT) pulsewidth modulated (PWM) Cúk power-factor corrector (PFC) is proposed to achieve unity power factor under zero-voltage-switching (ZVS) operations. In the proposed ZVT PWM Cúk PFC, not only the power switch, but also the power diode, commutate under ZVS. The proposed topology has the shortest ZVT time and, thus, the shortest minimum duty cycle compared with other ZVT PWM topologies. The resonant inductor can be discharged regardless of the state of the main switch. Extremely short ZVT time and robust discharge of the resonant inductor make the proposed topology well qualified for variable-duty and highswitching-frequency applications. Analytical studies, design rules, and experimental waveforms of the ZVT PWM Cúk PFC are presented in detail.

Interleaved Boost Converter with ZVT-ZCT for the Main Switches and ZCS for the Auxiliary Switch

“…As seen in the half-resonant drawbacks, the active clamp , the zero-voltage transition (ZVT) [21][22][23][24][25][26][27] and the zero-current transition (ZCT) [28][29][30] are presented. As the voltage clamp is applied to the non-isolated power supply, the parasitic inductance of the line and the leakage inductance of the transformer are used as the auxiliary inductance, which will oscillate with the auxiliary capacitance.…”

Zero‐voltage transition bridgeless single‐ended primary inductance converter power factor correction rectifier

“…As a result, the conduction losses are reduced by 1/3 with respect to conventional PFC converter [9]. Other converters such as single-ended primary inductance converter (SEPIC), Cuk, buck-boost and buck converters are used in bridgeless configuration [8,[10][11][12][13][14][15][16][17][18][19] to overcome the problems associated with boost PFC.…”

“…2 shows the conventional SEPIC PFC converter. Bridgeless PFC rectifiers based on the SEPIC topology are presented in [8,[14][15][16][17][18][19]. In [19], an attractive topology is proposed as a bridgeless SEPIC PFC converter.…”

“…In [19], an attractive topology is proposed as a bridgeless SEPIC PFC converter. The number of elements used in this converter is reduced in comparison with other proposed SEPIC PFC converters [8,[14][15][16][17][18] and also the gate driver of this converter is connected to ground.…”