Patent ID: 7315150
Filing Date: 2008-01-01
Classification: G05F,H02M,Y02B

Abstract:
1. A method of power conversion which achieves high power factor correction using ripple current mode control comprising: rectifying an AC input voltage; storing energy in a magnetic storage element; directing current from said magnetic storage element to a charge storage element by using a transfer element to transfer energy to said charge storage element for an energy transfer duration; transferring energy to an output load element; directing said magnetic storage element current to a sampling means to sample and store said magnetic storage element current levels; processing said magnetic storage element storage duration relative to said magnetic storage element storage duration plus the said energy transfer duration for charging said charge storage element based on said magnetic storage element sampled current levels and an energy demand signal to approximate a resistive load characteristic at the AC input voltage achieving high power factor correction; adjusting energy conversion levels based on the said energy demand signal; limiting the change in consecutive said magnetic and charge storage durations to achieve stability over the full range of operation; averaging consecutive said magnetic charge storage durations to reduce noise susceptibility; controlling a switching member to store energy in said magnetic storage element; and controlling a switching member to transfer energy to said charge storage element.