Patent ID: 9572206
Date: 2017-02-14
CPC Classifications: H02M,H05B,Y02B

Claim:
1. A power converter comprising: a rectifier configured to couple to an alternative current (AC) input voltage; an active valley fill (AVF) capacitor coupled to an output of the rectifier and a first switch, the first switch configurable by a control circuit for enabling a flow of current from the AVF capacitor; an energy storage circuit coupled to the AVF capacitor, to the output of the rectifier and to a second switch, the second switch configurable for regulating current in the energy storage circuit; and the control circuit coupled to the first switch and the second switch, the control circuit configured to control duty cycles of the first switch and the second switch concurrently during a portion of a cycle of the AC input voltage to supply current from the AVF capacitor and the AC input voltage to the energy storage circuit, where the control circuit is configured to increase a duty cycle associated with at least one of the first switch or the second switch based on current supplied by the AVF capacitor as the AC input voltage decreases, wherein the duty cycle associated with at least one of the first switch or the second switch controls current pulses provided to the energy storage circuit based on the AC input voltage and the AVF capacitor.