One-cycle controlled half-bridge series-resonant DC to AC inverter with reduced conduction loss

A one-cycle controlled half-bridge series-resonant inverter (HE-SRI) with reduced conduction loss is proposed. The presented circuit topology is both compact and simple, and is only configured by two power switches and an output filter. There is only one conduction loss of the power device in the power flow path during the inversion period. A resonant cell is built in the power stage to provide zero-current switching for turning on the power switch. The one-cycle control immunizes the inverter against perturbations of the input DC bus, and provides good system dynamic regulation with sinusoidal PWM control. A state-space averaging approach is conducted to model and analyze the system. A design example is explored to assess the system´s performance. The presented inverter has high power efficiency above 91% under the rated power of 500 W