An inverter is a device that converts direct current into alternating current. Solar cells will generate direct current in the sunlight, and the storage battery is also direct current, but the direct current power supply system has great limitations, the daily life of the fluorescent lamp, TV, refrigerator, electric fan and other AC loads can not be powered by DC power supply. If photovoltaic power generation is to be widely used in our daily life, the inverter that can convert DC into AC is indispensable.