A single-stage grid-connected flyback inverter with power decoupling function

In this paper, a novel single-stage flyback inverter with power decoupling function is proposed. An auxiliary circuit responsible for dealing with power pulsation is introduced. Besides power pulsation decoupling, auxiliary circuit also offers flowing path for transformer´s leakage energy. Voltage control loop is employed for the stability of the voltage across the auxiliary capacitor. Peak current control method is adopted without sampling any currents. Power decoupling can be realized while the function of voltage conversion is achieved. In this paper, operation principle, key devices design as well as control strategy are analyzed in details. Simulation and a 90W prototype are built to verify the proposed inverter. Experimental results show this inverter has the capability of power pulsation decoupling.