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发明公开
CN101552566A 谐振切换功率转换器的同步整流器 有权

谐振切换功率转换器的同步整流器
摘要：
本发明提供了一种用以提高效率的谐振切换功率转换器的同步整流器。该同步整流器包括连接到变压器以及谐振切换功率转换器的输出且用于整流的功率晶体管和二极管；控制器根据启动信号和截止信号产生驱动信号来控制功率晶体管；因果电路根据启动信号而产生截止信号；一旦二极管被正向偏压即启动信号被致能。启动信号连接至致能驱动信号以开启功率晶体管，而截止信号则连接至禁能驱动信号以关闭功率晶体管。
摘要（英）：

The invention provides a synchronous rectifier of a resonant switching power converter for improving efficiency, which comprises a power transistor and a diode applied to rectifying and connected to a transformer and output of the resonant switching power converter; a controller is used for controlling the power transistor through drive signal generated according to start signal and stop signal; stop signal is generated by a causal circuit based on the start signal; once the diode is biased forwardly, the start signal is enabled. The start signal is connected to the enabled drive signal to start the power transistor; the stop signal is then connected to disabled drive signal to close the power transistor.

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