| 摘要 |
A high efficiency flyback converter with synchronous rectifying, uses an equivalent-conducting resistor of a synchronous switch coupled with the synchronous rectifier to detect the secondary current of a transformer. Included is a logic circuit to control the duty cycle of the synchronous switch to avoid the vibration of the driving pulse. There is no inductance element, such as a current sensor, in the main power circuit loop, so that the power efficiency will be increased. The driving pulse signal drives the synchronous switch to turn on simultaneously with an output diode to reduce the component stress of the output diode, and to reduce the switching loss to promote the efficiency of the flyback converter power supply.
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