Input filter design considerations for boost-derived high power-factor converters

The authors present an analysis which gives insight into the selection of the input inductor and the optional ripple current filter capacitor used in single phase boost-derived high power factor converters. The analysis uses circuit models to derive expressions which relate the filter inductor and capacitor to input current total harmonic distortion (THD). A simple model of a hysteresis-controlled high power factor converter is implemented in PSPICE to corroborate the analysis. A comparison is made between analytic and simulated results. The analytic model proves to be more conservative that the simulations, always predicting a slightly higher THD