US Patent No. 10,461,644

SYNCHRONOUS RECTIFICATION SWITCH CONTROL WITH AUTOMATIC COMPENSATION AND RESET


Patent No. 10,461,644
Issue Date October 29, 2019
Title Synchronous Rectification Switch Control With Automatic Compensation And Reset
Inventorship Xiaowu Gong, Singapore (SG)
Andrey Malinin, Fort Collins, CO (US)
Assignee Infineon Technologies Austria AG, Villach (AT)

Claim of US Patent No. 10,461,644

1. A synchronous rectification (SR) controller for controlling an SR switch of a switched-mode power converter having an output winding, the SR controller comprising:a first input for sensing a first voltage at a first terminal of the output winding;
a first voltage divider for reducing the first voltage, thereby providing a reduced first voltage;
a second input for sensing a second voltage at a second terminal of the output winding;
a second voltage divider for reducing the second voltage, thereby providing a reduced second voltage;
a volt-second determiner configured to input the reduced first voltage and the reduced second voltage, and provide a volt-second output based upon the reduced first and second voltages, wherein the volt-second output corresponds to a winding current through the output winding; and
an SR switch turn-off signal generator configured to generate an SR switch turn-off signal based upon the volt-second output and a first reference.