Patent ID: 8013586

Claim:
An offset regulating loop for a synchronous rectifier, the offset regulating loop comprising: means to detect current flowing in an energy storage element of the synchronous rectifier; and means to open a controlled switch in a current recirculation loop for the energy storage element at a selected time before current in the current recirculation loop falls to a zero value, the means to open being responsive to the means to detect current flowing in the energy storage element, wherein the means to detect comprises a comparator having an offset control input; wherein the means to open comprises a first and a second current source, wherein the first current source is configured to provide a first current to an integrator for a first time interval before the current flowing in the energy storage element falls to a zero value, and the second current source is configured to provide a second current of opposite polarity to the first current to the integrator for a second time interval after the current flowing in the energy storage element falls to a zero value; wherein the integrator is configured to provide an integrated signal to the offset control input of the comparator; and wherein the integrated signal adjusts an offset of the comparator in a manner to maintain the first and second time intervals at approximately equal values.