Structure and working principle of photovoltaic inverters

The inverter is a power adjustment device consisting of a semiconductor device, it is mainly used to convert the DC power into AC power. Generally consists of a boost circuit and an Off grid inverters bridge circuit. Boosting circuit boosting the DC voltage to the solar cell necessary for controlling the inverter output DC voltage; put the bridge circuit of the 500w solar inverter DC voltage boosted equivalently converted into the common frequency AC voltage. The inverter is mainly composed of switching elements such as transistors, by regularly make switching element is repeated on - off (ON-OFF), the DC input into AC output. Of course, this is simply an 48v to 220v power inverter output waveform generated by the opening and closing of the circuit is not practical. Generally require the use of a high frequency pulse width modulation (SPWM), so close to the sine wave voltage across the width becomes narrow, the center of the sine wave voltage width wider, and in a half-cycle so that the switching element is always in one direction at a certain frequency operation, the thus formed a pulse wave train (quasi-sine waves). Then let the pulse wave formed by a simple sinusoidal filter.