Patent ID: 9178441
Filing Date: 2015-11-03
Classification: H02M

Abstract:
1. A switched-mode power conversion circuit, comprising: a switch control circuit including switch control outputs coupleable to switches included in a bridge network, the switches controllably coupling power input nodes to an isolation transformer according to switch states established by the switch control circuit; a current monitoring circuit coupleable to the isolation transformer, the current monitoring circuit including an output indicative of a current flowing through a winding of the isolation transformer; a sampling circuit coupled to the output of the current monitoring circuit to obtain information indicative of a first current peak during a first sampling duration corresponding to a first current polarity established by the bridge network and a second current peak during a second sampling duration corresponding to an opposite second current polarity established by the bridge network; an analog-to-digital converter including an input coupled to the sampling circuit, the analog-to-digital converter including a digital output indicative of the first current peak and the second current peak; wherein the switch control circuit is coupled to the digital output of the analog-to-digital converter; wherein the switch control circuit includes a difference circuit comprising inputs respectively arranged to receive the digital output indicative of the first current peak and the second current peak, and a digital output indicative of a difference between the first and second current peaks; wherein the switch control circuit includes an input coupled to the digital output indicative of a difference between the first and second current peaks; and wherein the switch control circuit is arranged to provide an on-duration of one or more switches in the bridge circuit established at least in part to reduce an amplitude difference between the first and second current peaks.