Micro inverter and control method thereof

The invention provides a micro inverter and a control method thereof, and belongs to the technical field of power electronics. The micro inverter comprises a primary side bridge arm, a secondary side bridge arm, a transformer and a controller. After a first moment and before a second moment, the controller can firstly output a plurality of driving signals with constant levels to a plurality of switching tubes included in the secondary bridge arm, so that at least part of the switching tubes in the secondary bridge arm are kept in a conducting state. Moreover, a plurality of continuous low-level driving signals can be output to a plurality of switching tubes included in the secondary side bridge arm after a second moment (namely, after the resonance current is smaller than or equal to the current threshold), so that the switching tubes in the secondary side bridge arm are turned off. Therefore, it can be ensured that the resonance current can still be discharged through the secondary bridge arm before the reso