State-Plane Analysis of Clamped-Mode Parallel-Resonant Converter

A novel constant-frequency, clamped-mode parallel-resonant converter is proposed and analyzed. Employing graphical state-plane techniques, five circuit operating modes together with their operating regions are defined, regions for natural and forced commutation are specified, and the dc control-to-output characteristics are derived. The predicted operating modes are experimentally verified using a 105kHz prototype circuit.12

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