Patent ID: 9548653
Date: 2017-01-17
CPC Classifications: H02M,Y02B

Claim:
1. A DC-to-DC converter, comprising: a power transformer having a primary side and a secondary side; a first switch coupled to the primary side of the transformer; a second switch coupled to the secondary side of the transformer; an inductor, at the secondary side of the power transformer, connected to an output voltage node and an inductor node; a voltage-second (VS) controller coupled to the inductor and configured to measure a voltage across the inductor in order to attain a measure of the volt-seconds across the inductor and configured to control, based on a first duty cycle for the first switch being less than a threshold, a second duty cycle for the second switch so as to cause an integral of a voltage drop between the inductor node and the output voltage node to equal zero over a period of time; and an output voltage control loop coupled to the VS controller and configured to generate a first signal associated with the first duty cycle; wherein while the VS controller controls the second duty cycle, a voltage level at the output voltage node maintains at a non-zero pre-bias value.