GRID-CONNECTION INVERTER AND INVERTER SYSTEM

摘要

A grid-connection inverter and an inverter system. The grid-connection inverter comprises: an auxiliary circuit configured to provide a first freewheel path and a second freewheel path. The auxiliary circuit comprises: a first transistor (S6) provided with a first body diode (D6), the source electrode being connected with a first port (21) of the grid-connection inverter, and the gate electrode being a control end; a first diode (7), the anode being connected with the drain electrode of the first transistor; a second transistor (S5) provided with a second body diode (D5), the drain electrode being connected with the cathode of the first diode, the source electrode being connected with a second port (22) of the grid-connection inverter, and the gate electrode being a control end; and a second diode (8), the anode being connected with the drain electrode of the second transistor, and the cathode being connected with the drain electrode of the first transistor. The first transistor, the first diode and the second transistor form the first freewheel path; the first transistor, the second diode and the second transistor form the second freewheel path; and the first port and the second port are connected with a power grid. The grid-connection inverter and the inverter system comprising the grid-connection inverter solve the technical problem of low working efficiency of the inverter.