Design and analysis of a hysteretic boost power factor correction circuit

Abstract

The design of an active unity power factor correction circuit with variable-hysteresis control for off-line switching power supplies is described. Design equations relating the boost indicator current ripple to the boost inductor selection and circuit performances are developed and verified with measurements. A computer-aided design program to select the optimal circuit components is developed. Design guidelines for the low-frequency feedback network are presented using the switch model for the power factor correction circuit. Small-signal transfer functions for open and closed-loop responses are derived.<>