Synchronous rectifying apparatus and controlling method thereof

摘要

The present application provides a synchronous rectifying apparatus and a control method thereof, the apparatus comprising: a transformer, a primary circuit, a rectifying circuit, a self-driving circuit, a PWM control circuit and an auxiliary control module including at least one auxiliary control circuit and at least one auxiliary winding, wherein the auxiliary control circuit includes at least one auxiliary switch and is electrically coupled to the Pulse Width Modulation control circuit and the auxiliary winding via the auxiliary switch, and the auxiliary winding is electrically coupled to the transformer; wherein before the transfer switch of the primary circuit is controlled to be turned on by the switching control signal, the auxiliary switch is controlled to be turned on by the auxiliary control signal, and the synchronous rectifier of the rectifying circuit is controlled to be turned off through the self-driving signal.

主权项

1. A synchronous rectifying apparatus, comprising:
a transformer including a primary winding and a secondary winding; a primary circuit including at least one transfer switch and being electrically coupled to the primary winding; a rectifying circuit including at least one synchronous rectifier and being electrically coupled to the secondary winding; a self-driving circuit electrically coupled to the rectifying circuit and outputting a self-driving signal; a Pulse Width Modulation control circuit electrically coupled to the primary circuit and outputting at least one switching control signal and at least one auxiliary control signal; and an auxiliary control module including at least one auxiliary control circuit and at least one auxiliary winding, wherein the auxiliary control circuit includes at least one auxiliary switch and is electrically coupled to the Pulse Width Modulation control circuit and the auxiliary winding via the auxiliary switch, and the auxiliary winding is electrically coupled to the transformer; wherein before the transfer switch is controlled to be turned on by the switching control signal, the auxiliary switch is controlled to be turned on by the auxiliary control signal, and the synchronous rectifier of the rectifying circuit is controlled to be turned off through the self-driving signal.