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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 to 97%t with the proposed circuitry, while the power factor was constant.

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