A novel zero-voltage-transition PWM Cuk power factor corrector

Abstract

A novel zero-voltage-transition (ZVT) PWM Cuk power factor corrector (PFC) is proposed to achieve unity power factor under zero-voltage-switching (ZVS) operations. In the proposed ZVT PWM Cuk PFC, not only the power switch but also the power diode commutate under ZVS. The proposed ZVT topology has the shortest ZVT time and thus the shortest minimum duty cycle compared with other ZVT topologies. The resonant inductor can be discharged regardless of the state of the main switch. Extremely short ZVT time and robust discharge of resonant inductor make the proposed ZVT topology well qualified for variable duty and high switching frequency applications. Analytical studies on the proposed ZVT PWM Cuk PFC are presented in detail. A 400W, 50kHz prototype has been built in the laboratory to experimentally verify the analysis.

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.…”