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    • 6. 发明授权
    • Circuit and method of activating and de-activating a switching regulator
at any point in a regulation cycle
    • 在调节周期中的任何点激活和去激活开关调节器的电路和方法
    • US6137702A
    • 2000-10-24
    • US304307
    • 1999-05-03
    • Jefferson W. HallJade H. Alberkrack
    • Jefferson W. HallJade H. Alberkrack
    • H02M3/157H02M3/24G05F1/40
    • H02M3/157
    • A switching regulator (18) for use in a switching power supply (10) receives a feedback signal and provides a gate drive signal. The switching regulator enables the gate drive signal once at any point during a cycle of an oscillator signal by setting a first latch (74) upon receiving a non-asserted feedback signal. Setting the first latch triggers a pulse generator (78) to generate a pulse signal. The first latch is not reset until the end of the cycle of the oscillator signal. Therefore, the pulse generator can generate only one pulse per oscillator cycle. The pulse signal sets a second latch (80) that enables the gate drive signal. The switching regulator disables the gate drive signal by resetting the second latch. A power transistor (20) conducts an inductor current through the primary winding of the transformer (16) in response to the gate drive signal.
    • 用于开关电源(10)的开关调节器(18)接收反馈信号并提供栅极驱动信号。 开关稳压器在振荡器信号的周期期间的任意点通过在接收到无断言的反馈信号时设置第一锁存器(74)来使门驱动信号一次。 设置第一个锁存器触发脉冲发生器(78)以产生脉冲信号。 在振荡器信号的周期结束之前,第一个锁存器不复位。 因此,每个振荡周期,脉冲发生器只能产生一个脉冲。 脉冲信号设置使能栅极驱动信号的第二锁存器(80)。 开关调节器通过复位第二个锁存器来禁用栅极驱动信号。 功率晶体管(20)响应于栅极驱动信号而导通电感器电流通过变压器(16)的初级绕组。