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    • 34. 发明授权
    • Switching power supply device and method
    • 开关电源装置及方法
    • US07035122B2
    • 2006-04-25
    • US10920816
    • 2004-08-18
    • Jung-Won KimDong-Young Huh
    • Jung-Won KimDong-Young Huh
    • H02M3/335
    • H02M3/33507H02M2001/0048Y02B70/1491
    • A switching power supply includes a switch, a bias-sensor to sense the switch-voltage, and a zero-crossing detector (ZCD) to sense time instances when the bias-sensor voltage crosses zero. ZCD generates a ZCD-signal, which transitions between a first and a second level at the sensed crossing instances, with a delay. ZCD-signal is coupled to a blanking circuit, generating a blank-signal and a pulse-signal, controlling the switch. The on-time of the switch can be modified by the input voltage and load. The blank-signal between on-times is adjusted to compensate for this modification, keeping the switching frequency below a predetermined limit and reducing the switching frequency. The switching power supply further includes a pulse width modulation (PWM) signal generator, coupled to the blanking circuit and to the switch. PWM signal generator turns on the switch controlled by the pulse-signal of the blanking circuit. Blanking circuit is controlled by either the on-time or a control voltage and input voltage.
    • 开关电源包括开关,感测开关电压的偏置传感器,以及当偏置传感器电压跨越零时检测时间实例的过零检测器(ZCD)。 ZCD产生一个ZCD信号,该ZCD信号在感测到的交叉实例处在第一和第二电平之间以延迟转换。 ZCD信号耦合到消隐电路,产生空白信号和脉冲信号,控制开关。 可以通过输入电压和负载来修改开关的导通时间。 调整接通时间之间的空白信号以补偿该修改,保持开关频率低于预定限制并降低开关频率。 开关电源还包括脉冲宽度调制(PWM)信号发生器,耦合到消隐电路和开关。 PWM信号发生器接通由消隐电路的脉冲信号控制的开关。 消隐电路由导通时间或控制电压和输入电压控制。