Method and apparatus for regulating current for programmable logic controllers
    1.
    发明授权
    Method and apparatus for regulating current for programmable logic controllers 失效
    用于调节可编程逻辑控制器电流的方法和装置

    公开(公告)号:US06978386B2

    公开(公告)日:2005-12-20

    申请号:US09751233

    申请日:2000-12-28

    IPC分类号: G05B19/05 G05F1/10 G05F1/40

    摘要: A method for reducing thermal dissipation in a single PLC package includes implementing a pulse width modulated current regulator including a field effect transistor (FET) switch, and utilizing a turn on delay of the FET to provide a wide operating range of current. The FET has an inherent turn-on time delay that can be exploited such that, as the duty cycle is reduced, the FET's drain to source impedance dominates an inductive path of an output filter and increases output filtering.

    摘要翻译: 一种用于减少单个PLC封装中的散热的方法包括实现包括场效应晶体管(FET)开关的脉宽调制电流调节器,并利用FET的导通延迟来提供宽的工作范围的电流。 FET具有固有的导通时间延迟,可以被利用,使得当占空比减小时,FET的漏源到源极阻抗支配输出滤波器的感应路径并增加输出滤波。