Transformerless Inverter using Charge Pump Circuit For Photovoltaic Application

Abstract

The leakage current is reduced by implementing a new transformerless inverter along with charge pump circuit concept. This topology consists of MOSFET switches (S1-S4), two diodes (D1-D2), two capacitors (C1-C2) and output filter (Lf, Cf). The leakage current is minimized and common mode voltage is created. Negative voltage is created by the charge pump circuit. The ripple present in output side is reduced by using the technique unipolar sinusoidal pulse width modulation (SPWM). The filter requirements are also reduced in the proposed inverter. The inverter has the following advantages 1) compact size 2) high efficiency 3) leakage current is minimized. Simulation results are presented using MATLAB.