As the traditional photovoltaic inverter system has problems like hot spot

low efficiency and so on

a high-efficiency

low input current ripple of isolated single-phase two-stage photovoltaic grid-connected micro-inverter is proposed. It is composed of two stages: the first stage is the DC/DC boosted link

and the second stage the inverter link. Based on the principle of active clamp and voltage double rectifier

this micro-inverter realizes soft switching on both the transformer primary side switch tube and secondary side rectifier diode

analyses the principle of working in the steady state and gives the key waves of the converter. In the inverter link stage

soft phase-locked and pulse width modulation (PWM) are applied to achieving grid-connection. This paper also presents a new low-cost method by incorporating a ripple cancellation duty ratio in the control duty ratio of the DC/DC converter to reduce the AC ripple current with double output frequency existing on the DC input side of the boost-buck converter. A 220 W photovoltaic micro-inverter prototype is developed and tested

the experimental results have verified the feasibility of the analysis.