Design of one cycle control for low distortion bipolar switching inverters

Constant frequency One Cycle Control (OCC), as proposed by Smedley, is a powerful method for controlling switching power converters. The dimensioning of this control method for two level AC output converters is not of common knowledge. This paper describes OCC for two level switched power converters. Its instability problems and solutions are analysed and dimensioning equations are deducted. This technique allows the construction of stable high bandwidth power converters with low output Total Harmonic Distortion (THD) and high Power supply Rejection Ratio (PSRR). The obtained analytical expressions are compared with experimental results, showing good correlation.