Patent ID: 8947895
Filing Date: 2015-02-03
Classification: H02M,H05B,Y02B

Abstract:
1. A system comprising: a switch configured to supply power to a load in response to the switch being turned on by pulse width modulation pulses; a first comparator configured to compare a first current through the switch to a first threshold and generate a first output in response to the first current being greater than or equal to the first threshold; a second comparator configured to compare the first current through the switch to a second threshold and generate a second output in response to the first current being greater than or equal to the second threshold, wherein the second threshold is greater than the first threshold; a current estimating module configured to determine an estimated current through the load based on the first current through the switch; and a current control module configured to adjust a duration for which the second output is selected based on a difference between the estimated current through the load and a desired current through the load.