Inverter structure and working principle

The inverter is a power adjusting means consisting of a semiconductor device, mainly for converting the DC power into AC power. Generally composed of a boost circuit and an  car inverters  bridge circuit. Boosting circuit boosting the DC voltage of the solar battery to the inverter output control DC voltages required; put the bridge circuit of the inverter DC voltage equivalent to the boosted common frequency is converted into an AC voltage. The inverter is constituted by the main switching element such as a transistor by the switching element regularly repeating ON - OFF (ON-OFF), the output of the DC input to AC. Of course, this is simply an  grid inverters  output waveform generated by the opening and closing of the circuit is not practical. Generally requires the use of a high frequency pulse width modulation (SPWM), brought close to the sine wave voltage across the width becomes narrow, the center voltage of the sine wave is widened, and in a half cycle of the switching element is always in one direction at a constant frequency operation, the thus formed a pulse wave train (quasi-sine wave). Then let the pulse wave form by a simple sine wave filters.