An improved zero-voltage-transition technique in a single-phase power factor correction circuit

This paper presents an improved zero-voltage-transition technique (ZVT-Technique) in a single-phase active power factor correction circuit based on a dc-dc boost converter topology and operated in a continuous-inductor-current mode with fixed-switching frequency control. An additional circuit for reducing the turn-off switching loss of the auxiliary switching circuit was applied. Experimental work was carried out with a circuit operated at 220 V_rms input voltage, 400 V_dc output voltage, 500 W output power and 40 kHz switching frequency. The test results showed that the efficiency was improved from 95 percent to 97 percent with the proposed circuitry, while the power factor was constant.