In contra variant and rectifier parts of an inverter,various high-efficiency reactors and transformers manufactured by InducTek Power Electronics for photovoltaic were provided stable control of input and output.

　　Known as power supply regulator, photovoltaicinverters may be classified into independent and parallel types according toapplication in photovoltaic power generation. They can also be divided intosquare wave inventers, stage phase wave inventers, sine wave inventers andcombined three phase inventers according to their different wave modulation.Those inventers used in parallel maybe also divided into transformer type andnon-transformer type.

　　As an electric power regulator composed of semiconductive parts, inverter is mainly used to transfer DC into AC.

　　Generally, inverters are composed of voltage step up part and bridge reverse part. In step-up part DC voltage from solar cell is boosted to that out-put control needs. Then in bridge reverse part, booted voltage is converted to equivalent AC voltage with usual frequency. Inventers are mainly composed of certain switches of crystal valves, which converter DC into AC via regularly putting on-off switches again and again. Certainly it’s on practicability for the output wave merely made by on-off switches. SPMW should be applied to narrow down the voltage width near the two ends of sine wave and make voltage width wider near the center of the sine wave. At the same time in each half cycle switches were operated in one direction all the way with certain frequency to from a series impulse waves (as if a sine wave). Then impulse wave become sine wave via simple filter.?