Novel control method of micro inverter

The invention discloses a novel control method of a micro inverter, the micro inverter comprises a main circuit topology, and the working mode and the time sequence of the main circuit topology can be divided into two conditions according to the positive and negative half axes of the power grid voltage. Working states under different switch tube combinations can be analyzed under two conditions: four switch tubes on the primary side of a transformer are alternately switched on by S1, S4, S2 and S3 on positive and negative half shafts of power grid voltage. Through control of a transformer primary side full-bridge circuit, according to positive and negative half axes of power grid voltage, a primary side bridge arm and a transformer can be used as flyback circuits in different working modes under different conditions in order to realize the same frequency and same phase with the power grid voltage and the polarity of a transformer primary side and a transformer secondary side which need to be combined with the