Build An Efficient 500-W Solar-Power Inverter Using IGBTs Build An Efficient 500-W Solar-Power Inverter Using IGBTs. During the positive output half-cycle, the high-side IGBT Q1 is sine PWM modulated, while the low-side Q4 is kept on ( Fig. 4 ). Similarly, during the negative output half-cycle, the high-side Q2 is sine PWM modulated while the low-side Q3 is kept on.[PDF] DC to AC Inverter IGBT Demo Board - Infineon Technologies The purpose of a DC to AC inverter is to convert DC voltage to a pure sinusoidal output voltage in applications such as UPS, solar inverter and frequency converter. This demo board is designed to operate without fan up to 500W.