Abstract: The operation principle of an active clamped flyback converter with non-complementary control was reviewed and the operation principle of a flyback type micro PV inverter was also introduced. Affects on inverter’s output current by the active clamp operation mode was analyzed in details. Mathematical expression of the output current was deduced and current distortion existing during some time was pointed out. For open loop control could not suppress the current distortion, a closed loop control method was proposed to improve quality and to reduce harmonics of output currents. A variety PI control method was adopted under different power ratings, to guarantee high quality of output currents in whole power range. Simulations and a micro inverter prototype of 230 Watts were built, and good output current waveforms under closed loop control were obtained. Experimental results show that the proposed closed loop control method can effectively suppress distortion of output currents, while maintaining a high efficiency reaching up to 94.2%.