Implementation of Voltage Control in Single-Phase Full Bridge Inverter Using One-Leg Plus Hysteresis Controller

Abstract

This paper discusses a single phase full bridge inverter with a new strategy, namely hysteresis control with zero crossing detector. Full bridge inverters are commonly used in UPS (uninterruptible power supply) applications. The full bridge inverter needs a high frequency signal to gain a maximum output. The simple strategy to control the single phase full bridge inverter is hysteresis control. The disadvantage of this strategy arises when facing a high frequency signal because it produces an overlapping signal. The solution to avoid it is by using a zero crossing detector strategy. By using a combined strategy within hysteresis and zero crossing detector, it allows implementation of high frequency signals to the power switches. Based on modeling, hardware implementation and laboratory measurements, this strategy produces good results with low ripple, smoother, and maintain a stable signal. The result calculated by simulation show THD value of 3,85%.