SMPS with a variable frequency start up circuit
    1.
    发明授权
    SMPS with a variable frequency start up circuit 失效
    具有变频启动电路的SMPS

    公开(公告)号:US5903451A

    公开(公告)日:1999-05-11

    申请号:US977515

    申请日:1997-11-24

    CPC分类号: H02M1/36

    摘要: The invention relates to a switch mode power supply (SMPS) comprising control means (IP1) including an oscillator (OS) for generating a pulse-width modulated signal (V2). The object is to provide a fast start-up time over a wide mains input-voltage range (AC). According to the invention, the switch mode power supply comprises a network (T2, R52, R51, R24) which provides in case of a high input voltage a soft start with a low oscillating frequency and in case of low input voltage a start-up with essentially the normal oscillating frequency. The invention provides a fast start-up time over a wide mains input voltage range of 90 Volt up to 265 Volt. The network includes a transistor (T2) used in inverse mode as a switching element which provides a threshold value of about 150 Volt. The power supply can be used advantageously as part of a TV receiver.

    摘要翻译: 本发明涉及包括控制装置(IP1)的开关模式电源(SMPS),该控制装置包括用于产生脉冲宽度调制信号(V2)的振荡器(OS)。 目的是在宽的电源输入电压范围(AC)上提供快速的启动时间。 根据本发明,开关模式电源包括网络(T2,R52,R51,R24),其在高输入电压的情况下提供具有低振荡频率的软启动,并且在低输入电压的情况下提供启动 基本上具有正常的振荡频率。 本发明在90伏至265伏特的宽电源输入电压范围内提供快速启动时间。 该网络包括在逆模式中使用的晶体管(T2)作为提供约150伏特的阈值的开关元件。 电源可以有利地用作电视接收机的一部分。

    Protection circuit for a switched mode power supply
    2.
    发明授权
    Protection circuit for a switched mode power supply 有权
    开关电源的保护电路

    公开(公告)号:US06678129B2

    公开(公告)日:2004-01-13

    申请号:US09794580

    申请日:2001-02-27

    IPC分类号: H02H700

    CPC分类号: H02M3/3385 H02H7/1213

    摘要: The protection circuit comprises a clamping circuit with a switching element for reducing a supply voltage in case of an over voltage condition, and a holding circuit for providing a holding current for the clamping circuit. The clamping circuit comprises a threshold circuit, which provides a switching voltage for a switching element when the supply voltage reaches an upper voltage limit. The switching element is connected to a charge capacitor, which provides the switching-on voltage for the switching transistor, and by reducing this supply voltage, the switching of the switching transistor is disabled. The holding circuit comprises in particular a capacitor, which is coupled via a resistor to the clamping circuit for providing an additional current in case of an over voltage condition.

    摘要翻译: 保护电路包括具有开关元件的钳位电路,用于在过电压状态的情况下降低电源电压,以及保持电路,用于为钳位电路提供保持电流。 钳位电路包括阈值电路,当电源电压达到上限电压时,其提供开关元件的开关电压。 开关元件连接到充电电容器,其提供开关晶体管的接通电压,并且通过减小该电源电压,开关晶体管的开关被禁止。 保持电路特别包括电容器,该电容器通过电阻器耦合到钳位电路,用于在过电压状况的情况下提供附加电流。

    Protection circuit for a switched-mode power supply
    3.
    发明授权
    Protection circuit for a switched-mode power supply 有权
    开关电源的保护电路

    公开(公告)号:US06233164B1

    公开(公告)日:2001-05-15

    申请号:US09431507

    申请日:1999-11-01

    IPC分类号: H02M7122

    CPC分类号: H02M3/3385 H02M1/32

    摘要: The protection circuit comprises a storage capacitor which is coupled with a terminal of a secondary winding which charges said storage capacitor during the on-interval of the switching transistor. During the off-interval of the switching transistor the charge of the storage capacitor is fed to the driver stage or the control capacitor for closing or keeping closed the switching transistor when one of the secondary windings has a short circuit.

    摘要翻译: 保护电路包括存储电容器,其与在开关晶体管的接通间隔期间对所述存储电容器充电的次级绕组的端子耦合。 在开关晶体管的截止间隔期间,当一个次级绕组具有短路时,存储电容器的电荷被馈送到驱动级或用于闭合或保持闭合开关晶体管的控制电容器。