Distortion analysis and equivalent impedance estimation of a class-D full-wave rectifier

The substantial increasing of switching devices utilization such as switching power converters, inverters, electronic ballast, UPS, and computer equipment, introduce harmonic distortion in supply systems because of their non-linear characteristics. The waveform distortion produces harmonics that not only increases power losses but also introduces a distortion power, which sums to time-average real and reactive power usually considered in linear circuits. Therefore, effects on harmonics must be considered in the circuit design. In this paper, the current distortion introduced by a Class-D full wave resonant rectifier used in a series-series compensation circuit for wireless power transfer is considered and a general approach to derive a rectifier equivalent impedance that consider the effect of distortion on the output power is presented.