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Design and Modeling of ZVS Resonant SEPIC Converter for High Frequency Applications

R. Sorna Vadivoo, L.Maheswari, S. Vijayalakshmi, K.R Vairamani

This paper presents a resonant SEPIC (Single-Ended Primary Inductor Converter) Converter and Control method suitable forVery High Frequency dcdc Power Conversion. SEPIC is chosen since it has positive voltage gain and higher characteristics than any other converter. The proposed design provides high efficiency over a wide range of input and output voltage ranges, up & down voltage conversion, small size and excellent transient performance. The Converter regulates the output using an ON-OFF control scheme modulating at a fixed frequency and duty ratio operation. This control method enables a fast transient response and efficient light-load operation while providing controlled spectral characteristics of input and Output waveforms. The resonant inductors and capacitors are fine tuned to achieve Zero Voltage Switching (ZVS) condition and thus the converter achieves higher than 80% efficiency across entire input voltage range at nominal output voltage and maintains good efficiency across the whole operating range.