说明：  光伏并网逆变器，额定功率为200w，前级通过交错反激实现升压，后级通过逆变全桥完成逆变最后实现并网。
(Photovoltaic grid-connected inverter, rated power 200w, the first stage boost through the boost, the latter through the inverter bridge to complete the inverter and finally achieve grid-connected.)