Class D converter with half-wave regulated synchronous rectifier

A Class D series resonant converter with a controllable PWM synchronous half-wave current-driven transformer rectifier is presented, including its analysis and experimental results. Replacing the diodes in a conventional current-driven half-wave rectifier with MOSFETs allows voltage regulation for line or load swings of greater than 70% at a minimum of 50% efficiency and a maximum above 80% for a 3.3 V supply producing 15 W of power. The operating frequency was held constant at 120 kHz. The rectifier is driven by a Class D ZVS series resonant inverter and a transformer, which provides a sinusoidal current source.<
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