A New Asymmetric Duty-Cycle Control for a ZVS Self-Oscillating Half-Bridge Inverter

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In this paper, a simple power control scheme for a constant frequency self-oscillating inverter with a variable duty cycle is proposed. The proposed topology, based on the half-bridge series resonant inverter, can achieve a stable and efficient Zero-Voltage-Switching (ZVS). As a consequence, the converter efficiency is significantly improved. This novel technique consists in injecting a DC control current through a saturable core providing a variable asymmetric control as a function of the injected current; we can therefore control and regulate the output power while maintaining the switching frequency close to the resonant one. The control principles of the proposed method are described in detail and its validity is verified through simulated and experimental results on 750 W with constant frequency variable power.
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Saturable Transformer with DC Control Current; Self-Oscillating Inverter; Asymmetrical Control; ZVS (Zero-Voltage-Switching)

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