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1. 发明授权

US4336491A Electronic monitoring system stabilized against accidental triggering 失效
标题翻译：电子监控系统防止意外触发
公开(公告)号：US4336491A
公开(公告)日：1982-06-22
申请号：US232186
申请日：1981-02-06
申请人： Robert Buck , Ingo S. Ozech
发明人： Robert Buck , Ingo S. Ozech
IPC分类号： H03K17/945 , H03K17/95 , H01H36/00
CPC分类号： H03K17/952
摘要： A contactless motion detector, including an oscillator sensitive to an approaching metallic element, includes an electronic switch such as a thyristor triggerable by an output signal from a demodulator comprising a storage capacitor which is alternately chargeable and dischargeable, preferably with constant current, during each cycle of a high-frequency voltage generated by the oscillator. The oscillator voltage is compared with a reference voltage by means of a differential amplifier causing the flow of a charging current into the capacitor when the oscillator voltage exceeds the reference voltage whereas a discharging current flows out of that capacitor in the opposite case. The reference voltage is so chosen that the capacitor charge rises in the course of a few cycles above a predetermined threshold when the oscillator voltage is high but remains below that threshold when it is low.
摘要翻译：包括对接近金属元件敏感的振荡器的非接触式运动检测器包括诸如可由来自解调器的输出信号触发的晶闸管的电子开关，该解调器包括在每个周期期间优选以恒定电流交替地可充电和放电的存储电容器由振荡器产生的高频电压。当振荡器电压超过参考电压时，通过差分放大器将振荡器电压与参考电压进行比较，而在相反的情况下，放电电流从该电容器流出。参考电压被选择为使得当振荡器电压高时，电容器电荷在高于预定阈值的几个周期的过程中上升，但是当其为低时，电容器电荷保持低于该阈值。

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