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    • 6. 发明授权
    • Photosensitive control with dynamic calibration
    • 动态校准光敏控制
    • US07148628B2
    • 2006-12-12
    • US10902759
    • 2004-07-30
    • Kim Irwin McCavitRoger Dennis CornettWilliam C. Raper
    • Kim Irwin McCavitRoger Dennis CornettWilliam C. Raper
    • H05B37/02
    • G01J1/32H05B37/0218Y02B20/46
    • A method and circuit arrangement dynamically calibrate a photosensitive control for a light source that includes a voltage divider circuit coupled to a resistive light detector and configured to output to a comparison circuit a variable voltage signal that varies with the resistance of the resistive light detector. To calibrate the photosensitive control, a variable impedance circuit in the voltage divider circuit is adjusted to null out any changes in voltage caused by feedback from the controlled light source. The amount of correction is proportional to the amount of light feedback. Based on the amount of correction needed, a new reference voltage is selected that will accurately detect the next dusk to dawn transition while the light feedback is present.
    • 一种方法和电路装置动态地校准光源的光敏控制器,该光源包括耦合到电阻光检测器的分压器电路,并被配置为向比较电路输出随电阻光检测器的电阻而变化的可变电压信号。 为了校准光敏控制,调节分压器电路中的可变阻抗电路以消除由受控光源的反馈引起的任何电压变化。 校正量与光反馈量成比例。 基于所需的校正量,选择新的参考电压,其将在存在光反馈时准确地检测下一个黄昏到黎明过渡。