Patent ID: 8687386

Claim:
A method for bi-directional current sensing for a synchronous rectifier bi-directional converter system, the method comprising sensing a first current through a first synchronous rectifier via a first transformer to provide a first signal, sensing a second current through a second synchronous rectifier via a second transformer to provide a second signal, DC restoring the first signal and the second signal by removing a DC bias from the first signal and the second signal to provide a first DC restored signal and a second DC restored signal respectively, wherein the DC restoring comprises: receiving a voltage indicating about zero current in at least one of the first synchronous rectifier and the second synchronous rectifier, and turning on at least one of two DC restore switches based on the voltage thereby grounding at least one of the first signal and the second signal; producing a first corrected signal by adding a first correction current to the first DC restored signal, producing a second corrected signal by adding a second correction current to the second DC restored signal, and producing a combined signal by adding the first corrected signal and the second corrected signal.