A soft switched zero voltage transition full bridge converter for reducing
power loss at very light loads for zero voltage switching (ZVS)
converters operating at high frequency. The converter has four switches
in two switching legs, each having two switches connected in series
between two input voltage terminals. Junction points of the legs are
coupled to a primary winding of a transformer. The transformer has a
secondary winding from which an output voltage of the converter is
derived by rectifying and filtering. A pair of capacitive voltage
dividers are connected between the input terminals, each formed by two
small capacitors, each having a parallel-connected diode. The output
voltage is regulated by phase shift control of the switches. The
capacitors are selected small enough for storing only enough energy to
enable ZVS in conjunction with two resonant inductors. The converter
enables reduced component size of the inductors and energy storage
capacitors.