Hand-held computer
    7.
    外观设计
    Hand-held computer 失效
    手提电脑

    公开(公告)号:USD512058S1

    公开(公告)日:2005-11-29

    申请号:US29192829

    申请日:2003-10-30

    申请人: Alan Ball

    设计人: Alan Ball

    Circuit and method for a switching power supply with primary side transformer sensing
    9.
    发明授权
    Circuit and method for a switching power supply with primary side transformer sensing 有权
    具有初级侧变压器感测的开关电源的电路和方法

    公开(公告)号:US06333624B1

    公开(公告)日:2001-12-25

    申请号:US09579124

    申请日:2000-05-30

    IPC分类号: G05F140

    摘要: A switching power supply (30) receives an AC voltage at a primary side of a transformer (36) and converts it to a regulated DC output voltage at the secondary side of the transformer (36). The switching power supply (30) includes a voltage regulation compensation circuit (52) to monitor the transformers primary side providing a reference signal VREF related to the transformers secondary side. Signal VCOMP is a current reference signal representative of the primary side inductor current flowing through the emitter of a power transistor (38). VCOMP is fed into a sample and hold circuit (70) and amplified to a DC level proportional to the peak level of the inductor current of the power transistor (38). The output of the sample and hold circuit (70) is fed to two inputs of a multiplier circuit (82) where the output thereof is a square of the two inputs fed to a k-factor circuit (83).

    摘要翻译: 开关电源(30)在变压器(36)的初级侧接收交流电压,并将其转换为变压器(36)的二次侧的稳定的直流输出电压。 开关电源(30)包括电压调节补偿电路(52),用于监视变压器初级侧,提供与变压器次级侧相关的参考信号VREF。 信号VCOMP是表示流过功率晶体管(38)的发射极的初级侧电感器电流的电流参考信号。 VCOMP被馈送到采样和保持电路(70)中并被放大到与功率晶体管(38)的电感电流的峰值电平成比例的直流电平。 采样和保持电路(70)的输出被馈送到乘法器电路(82)的两个输入,其中输出是馈送到k因子电路(83)的两个输入的平方。