利索-全球专利检索

  1. 登录
  2. 注册

搜索结果

2 条记录 (耗时 0.008 秒)

    Compensated current sensing circuit
    2.
    发明公开
    Compensated current sensing circuit 失效
    Kompensierte Strommessungsschaltung。

    公开(公告)号：EP0353039A1

    公开(公告)日：1990-01-31

    申请号：EP89307579.6

    申请日：1989-07-25

    申请人： GENERAL ELECTRIC COMPANY

    发明人： Wrathal, Robert Stephen

    IPC分类号： G01R19/165 ,  G01R17/06 ,  G05F1/573

    CPC分类号： G01R17/06 ,  G01R19/16519 ,  G05F3/24

    摘要： A current sensing circuit includes a first reference resistor (Rp) connected in series with the source-drain path of a current mirroring transistor (T2) across the source-drain path of a power transistor (T1) which is N times the size of the current mirroring transistor. Due to the first reference resistor (Rp), the current in the mirroring transistor is less than 1/N the current in the power transistor. To sense the current in the power transistor more accurately, the current sensing circuitry includes a reference circuit (22) in which the source-drain path of a compensating transistor (T3), of like size as the current mirroring transistor (T2), is connected in parallel with a second reference resistor (RR) to produce a reference current (IR) which is approximately equal to 1/N the current flowing in the power transistor (T1).

    摘要翻译： 电流检测电路包括与功率晶体管（T1）的源极 - 漏极路径跨过电流镜像晶体管（T2）的源极 - 漏极路径串联连接的第一参考电阻器（Rp），该功率晶体管（T1）的尺寸为N倍 电流镜像晶体管。 由于第一个参考电阻（Rp），镜像晶体管中的电流小于功率晶体管中的电流的1 / N。 为了更精确地感测功率晶体管中的电流，电流感测电路包括参考电路（22），其中与电流镜像晶体管（T2）类似尺寸的补偿晶体管（T3）的源极 - 漏极路径是 与第二参考电阻器（RR）并联连接以产生大约等于在功率晶体管（T1）中流动的电流的1 / N的参考电流（IR）。