Patent ID: 7099161

Claim:
A control method for a first synchronous rectifier and a second synchronous rectifier in a switching power converter comprising a transformer, and a first switching device and a second switching device connected in series and in parallel with an input voltage source, wherein said first synchronous rectifier is connected with a low end of a secondary winding of said transformer, said second synchronous rectifier is connected with a high end of said secondary winding of said transformer, said first switching device is connected with a high end of said input voltage source, and said second switching device is connected with a low end of said input voltage source, comprising, driving said first switching device to an on state and said second switching device to an off state; and driving said second synchronous rectifier to an off state not earlier than a time when said second switching device has been driven to an on state, such that a power is delivered from said primary winding to said secondary winding.