Performance, design and control of a series-parallel (CL2-type) resonant DC/DC converter

The three-element resonant network has various topological alternatives, one of which, a prospective compound topology, is investigated in detail. The converter uses one capacitor (C) and two inductors (L2), to form a compound type CL2 network. Various advantages and limitations of the converter are detailed, and a new design procedure for such converters is also introduced. The converter may be controlled by varying the switching frequency or by pulse-width modulation. An experimental prototype has been produced and an excellent performance in the lagging power-factor mode has been confirmed