A symmetrical hybrid sine PWM switching technique for full bridge inverters

Abstract

PWM switching technique is commonly used in full bridge converters to over come the bulky filter requirements and efficient voltage control, at the cost of higher switching losses. However hybrid PWM method which uses both high and low switching signals, reduces the overall switching losses. The switches driven with high frequency switching signals dissipates more heat compared to the switches driven with low frequency switching signals. This results in unequal temperature rise in the switches leading to low reliability. The proposed method uses symmetrical hybrid PWM switching scheme which makes the switching losses of all four switches equal leading to higher efficiency and greater reliability.