The solar inverter, also known as the power regulator, the core of the inverter device is the inverter switch circuit, referred to as the inverter circuit. It is generally composed of a boost circuit and an inverter bridge circuit. The boost circuit boosts the DC voltage of the solar panel to the DC voltage required for the inverter output control; the inverter bridge circuit boosts the boosted DC voltage. Equivalently converted to AC voltage of common frequency. The function of inverter is mainly completed by the switching element by regularly repeating the ON-OFF (ON-OFF), so that the DC input becomes the AC output. In addition, it is necessary to use high-frequency pulse width modulation (SPWM) to narrow the voltage width near the two ends of the sine wave, and widen the voltage width at the center of the sine wave, and always make the switching element move in one direction at a certain frequency during the half cycle. action, thus forming a pulse wave train (quasi-sine wave). Then let the pulse wave pass through a simple filter to form a sine wave, thus completing the process of inverting alternating current from direct current. The AC output parameters (voltage, frequency, phase) of the inverter will be consistent with the grid height, so that the photovoltaic power generation system can be connected to the grid normally.
