stress. This stress can vary with the input voltage and the output loading, making
some topologies better suited for certain ranges of input voltages and output
powers. For instance, the ZCS QR supplies are good at high input voltages, but
poor at high output powers. Conversely ZVS QR converters are good at high
output powers but poor at high input voltages.
Most zero-current quasi-resonant applications are no more than 300W, but
zero-voltage quasi-resonant applications can provide many kilowatts in output
power. Two power switch topologies will distribute the losses in two packages
thus making them better for the higher output powers. The topologies ...