| 摘要 |
The present invention discloses a variable frequency PWM synchronous rectifier power supply comprising: a transformer, a PWM control circuit and a synchronous rectification switch circuit. The transformer has a primary side and a secondary side, and an isolation circuit is provided for separating the primary side and the secondary side, and the primary side uses a transmit/receive switch circuit to drive the transformer, and the secondary side uses a filter circuit to output different voltages to an external load. The PWM control circuit is situated on the secondary side and coupled to the isolation circuit and filter circuit, for generating a control signal to the isolation circuit to drive the transmit/receive switch circuit. The synchronous rectification switch circuit is situated on the secondary side and coupled to the PWM control circuit for receiving a timing delay control signal provided by the PWM control circuit.
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