A New Family of Zero-Current-Switching-Variable Frequency dc-dc Converters

A new family of zero-current-switching variable-frequency DC-DC power converters is presented. It employs two unidirectional current switches, one diode, two small reactive components and a filter capacitor. Zero current turn-on and turn-off ensure low switching losses and smooth current waveforms result in low electromagnetic noise emission. The discontinuous operating mode and the variable switching frequency make the presented topology suitable for low-power applications or for high-power low-frequency applications where SCRs can be profitably used. Experimental results of a prototype confirm the theoretical expectations of the proposed solution.