| 摘要 |
<p>A grid-connected inverter circuit and a control method thereof. The grid-connected inverter circuit comprises an inverter unit, a freewheeling unit, an output unit and a control unit. The control unit is connected to grid electrodes of switch tubes in the inverter unit and the freewheeling unit and outputs control signals. When a grid connected to the grid-connected inverter circuit is in a positive half-period or a negative half-period, the control unit controls on-off of each switch tube. When switch tubes in a high frequency on-off working state turn to off-state, the freewheeling circuit and the grid form an inverter loop because an inductive current in a circuit cannot mutate, which maintains a current in the grid-connected inverter circuit, effectively suppresses a common-mode leakage current to the ground caused because a direct current power supply has a ground capacitance, reduces a conduction loss of a switch tube in the inverter unit, and improves inverter efficiency of the grid-connected inverter circuit.</p> |
