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    • 10. 发明授权
    • Brightness sensor
    • 亮度传感器
    • US07919935B2
    • 2011-04-05
    • US11793003
    • 2005-12-01
    • Gerfried RüdigerJens RichterOliver Narwark
    • Gerfried RüdigerJens RichterOliver Narwark
    • G05F1/00
    • H05B33/08Y02B20/32
    • An electroluminescent (EL) element is connected to the power supply and is intermittently operated as a lighting device and as a brightness sensor. For this purpose, the processing unit induces the controlled AC voltage source to reduce the voltage for a short period. The current intensity is measured by current measuring devices and the corresponding measuring signal is digitized using the analog/digital converter (A/D). A processing unit uses the signal and the effective voltage to determine, by means of empirical calibration data stored in the memory or by using a calibration function, the brightness, i.e. the luminance of the light that is incident on the EL element. The processing unit associates, using desired values stored in the memory, the detected brightness with an operating voltage level which ensures the desired emission brightness of the EL element when operated as a lighting device. Optionally, the determined operating voltage is corrected in order to take into consideration any brightness loss of the EL element caused by aging. The optionally corrected value is output via the control channel as the desired operating voltage and is maintained by the power supply unit until the next measuring interval.
    • 电致发光(EL)元件连接到电源,并且被间歇地操作为照明装置和亮度传感器。 为此,处理单元引起受控的AC电压源,以在短时间内降低电压。 电流强度由电流测量装置测量,相应的测量信号使用模拟/数字转换器(A / D)进行数字化。 处理单元使用信号和有效电压,通过存储在存储器中的经验校准数据或通过使用校准功能来确定亮度,即入射在EL元件上的光的亮度。 处理单元使用存储在存储器中的期望值将检测到的亮度与确保作为照明装置操作时的EL元件的期望发光亮度的工作电压电平相关联。 可选地,校正所确定的工作电压,以便考虑由老化引起的EL元件的任何亮度损失。 经过控制通道输出可选择的校正值作为所需的工作电压,由供电单元维持直到下一个测量间隔。