| 摘要 |
For use with a synchronous rectifier of a power converter, a self-synchronizing drive circuit and a method of driving the synchronous rectifier. In one embodiment, the circuit includes: (1) a drive winding, associated with an isolation transformer of the power converter and coupled to a rectifying switch in the synchronous rectifier, that provides a drive signal based on a voltage in the isolation transformer to a control terminal of the rectifying switch to charge the control terminal synchronously with the voltage, (2) a drive switch, interposed between the drive winding and the control terminal, that periodically resists creation of a negative potential on the control terminal and (3) a discharge device, coupled to the drive winding, that receives the drive signal and discharges the control terminal synchronously with the voltage.
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