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    • 94. 发明授权
    • Flyback circuit providing synchronized control
    • 反激电路提供同步控制
    • US07907426B2
    • 2011-03-15
    • US12189419
    • 2008-08-11
    • Kuo-Fan LinChien-Li Tsai
    • Kuo-Fan LinChien-Li Tsai
    • H02M3/335
    • H02M3/33592Y02B70/1475
    • A flyback circuit providing synchronized control includes a pulse width modulation (PWM) unit, a synchronized control unit and an ON period limiting unit. The PWM unit generates a driving signal to control a switch ON period of a primary winding and provides a synchronized signal prior to the generation of the driving signal that has output time series ahead the driving signal. The synchronized control unit receives the synchronized signal through an induction winding to set off a synchronized commutation switch. The ON period limiting unit starts a period limiting time series after the synchronized commutation switch has been set on. After the synchronized commutation switch is set off by the synchronized signal the ON period limiting unit is reset to an initial condition. The synchronized commutation switch maintains an ON condition until the period limiting time series end, then the ON period limiting unit generates a forced ending signal to set off the synchronized commutation switch so that the flyback circuit maintains operation at a minimum duty frequency.
    • 提供同步控制的反激电路包括脉冲宽度调制(PWM)单元,同步控制单元和导通周期限制单元。 PWM单元产生驱动信号以控制初级绕组的开关导通周期,并且在产生具有在驱动信号之前具有输出时间序列的驱动信号之前提供同步信号。 同步控制单元通过感应线圈接收同步信号,以便设置同步换向开关。 ON周期限制单元在同步换向开关置位之后开始周期限制时间序列。 在通过同步信号设定同步换向开关之后,将ON周期限制单元复位到初始状态。 同步换向开关保持ON状态,直到周期限制时间序列结束为止,则ON周期限制单元产生强制结束信号,以使同步换向开关断开,使得回扫电路以最小占空比维持运行。