High Frequency Isolated AC-DC Converter With High Power Factor Based On ZVS Push-Pull Converters

This paper presents a high-frequency isolated AC-DC converter with a high-power factor and Zero-Voltage Switching (ZVS) of main and auxiliary switches. The proposed structure is based on two ZVS current-fed Push-Pull DC-DC converters, which are interconnected through the magnetic coupling of storage inductors and transformers. Another feature is the possibility of connecting the inputs in series or in parallel depending on the value of the alternating input voltage. To control the power flow from input to output, the classical average current mode control was used. To verify the principle of operation, a design example with the specifications and considerations of
$\mathrm{V}_{\mathrm{i}}=220\mathrm{V}\pm 20 {\%},\mathrm{P}_{\mathrm{o}}=5 \text{kW}, \mathrm{V}_{\mathrm{o}}=400\mathrm{V}$
‘,
$\mathrm{f}_{\mathrm{r}}=60\text{Hz}$
, and
$\mathrm{f}_{\mathrm{s}}=25\text{kHz}$
was developed.