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    • 4. 发明授权
    • Human body detector
    • 人体检测仪
    • US06774789B2
    • 2004-08-10
    • US09925308
    • 2001-08-10
    • Hisashi InabaYuichi MurakamiKiyokazu IedaEiji MushiakeHiroki Okada
    • Hisashi InabaYuichi MurakamiKiyokazu IedaEiji MushiakeHiroki Okada
    • G08B1300
    • B60R25/246G07C2209/64
    • In a human body detector, a wave-detection circuit for detecting waves of a resonance voltage is connected to a sensor resonance circuit that varies a constant frequency voltage in accordance with a change in the capacitance of a sensor electrode. The wave-detection circuit is connected to a differentiator that acquires a changing rate by differentiating the wave-detection voltage with respect to time, and allows a voltage to pass if the changing rate of the voltage is greater than or equal to a predetermined value. The differentiator is connected to a high-pass filter that allows passage of a voltage whose changing rate is greater than or equal to a second predetermined value. The high-pass filter is connected to a comparator whose non-inversion input terminal is connected to a power source that applies thereto a reference voltage.
    • 在人体检测器中,用于检测谐振电压波的波检测电路被连接到根据传感器电极的电容变化而改变恒定频率电压的传感器谐振电路。 波检测电路通过将波检测电压相对于时间进行微分而获得变化率的微分器连接,如果电压的变化率大于或等于预定值,则允许电压通过。 微分器连接到允许通过变化率大于或等于第二预定值的电压的高通滤波器。 高通滤波器连接到比较器,其非反相输入端连接到施加到基准电压的电源。