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    • 4. 发明申请
    • Method and apparatus for determining a switching signal state
    • 用于确定开关信号状态的方法和装置
    • US20050073202A1
    • 2005-04-07
    • US10663046
    • 2003-09-15
    • Michael GasperiDavid BrandtThong Nguyen
    • Michael GasperiDavid BrandtThong Nguyen
    • G01D5/24H03K17/945H02B1/24
    • H03K17/955G01D5/24H03K2217/960705Y10T307/766Y10T307/826
    • A technique for controlling a switching circuit, such as a relay, includes one or more sensing circuits that generate signals based upon the presence of an actuating object and upon a randomly applied strobe signal. The generated signals are sampled and are used as a basis for determining the state of an output signal. The sensing circuit may generate the signals based upon capacitive coupling with the actuating object. The randomization of the sampling provides enhanced immunity to periodic or cyclic noise. Where more than one sensing circuit is included, the output of the circuits may be considered together for determining the state of the output signal, such as based upon predetermined ranges of signal levels. Signals of the sensing circuit may be sampled in the absence of the strobe to provide an indication of the relative noise level. If the noise level is determined to be elevated, the output signal may not change states.
    • 用于控制诸如继电器的开关电路的技术包括一个或多个感测电路,其基于执行对象的存在以及随机应用的选通信号产生信号。 产生的信号被采样,并被用作确定输出信号的状态的基础。 感测电路可以基于与致动对象的电容耦合来产生信号。 采样的随机化提供了对周期性或循环噪声的增强的抗扰性。 在包括多于一个感测电路的情况下,可以一起考虑电路的输出以确定输出信号的状态,例如基于预定的信号电平范围。 感测电路的信号可以在没有选通信号的情况下进行采样,以提供相对噪声电平的指示。 如果确定噪声电平升高,则输出信号可能不会改变状态。