METHOD OF CONTROLLING A POWER FACTOR CORRECTION CONVERTER AND RELATED CLOSED-LOOP CONTROL SYSTEM

摘要

A method controls a power factor correction converter that includes a boost inductor and a switch. The method generates a sense signal representing a rectified AC input voltage or an inductor current through the boost inductor, turns on the switch in response to determining, based on the sense signal, a zero current condition through the boost inductor, turns off the switch after an on-time interval, generates a feedback signal based on an output voltage of the converter, and compares the feedback signal with a threshold. If the feedback signal is smaller than the threshold, the method generates a command signal, representing a phase domain including 0 and π, based on the feedback signal and the power threshold, and keeps the switch off when a phase of the input rectified AC voltage or of the inductor current is in the phase domain even if the zero current condition has been determined.

主权项

1. A method of controlling a power factor correction converter that includes a boost inductor, a switch, a diode, and an output tank capacitor, the method comprising:
generating a sense signal representative of a rectified AC input voltage or of an inductor current flowing through said boost inductor of said power factor correction converter, turning on the switch in response to determining, based on the sense signal, a zero current condition through the boost inductor and turning off the switch after an on-time interval has elapsed; generating a feedback signal representative of an output power delivered by the power factor correction converter, based on an output voltage of the power factor correction converter; comparing said feedback signal with a power threshold; if said feedback signal is smaller than said power threshold:
generating a command signal, representing a phase domain including 0 and π, based on said feedback signal and on said power threshold; andkeeping off said switch when a phase of the input rectified AC voltage or of said inductor current is comprised in said phase domain even if said zero current condition has been determined.