Method of controlling a power factor correction converter and related closed-loop control system
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United States of America Patent
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Aug 9, 2016
Grant Date -
Jun 4, 2015
app pub date -
Nov 20, 2014
filing date -
Nov 29, 2013
priority date (Note) -
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Abstract
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.
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