A Novel Series-Resonant Converter Topology

A converter topology based on the principles of seriesresonant (SR) power conversion is described in which the input and output of this converter have one terminal in common, and the transformer is omitted. Both the underlying theory and associated waveforms are presented. The converter is suitable for dc-dc as well as for dc-ac conversion. Special attention is given to operation in the region where the input voltage is approximately equal to the output voltage (q-1). Test results of a 700-W multiquadrant dc-dc and/or dc-ac converter are shown.