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本发明涉及半导体领域,公开了一种LED光线传感器及检测方法。一种LED光线传感器,包括:微控制器、微控制器内部的AD模数转换模块、LED。本发明采用检测PN结等效电容电压的方案,不需要使用高精度ADC,将测量PN结等效电流的变化转换为测量PN结等效结电容电压的变化,解决了微小电流的检测问题。PN结等效电流源与PN结等效电容并联,当LED两端没有施加外部电场时,PN结等效电容上存储电荷会通过PN结等效电流源释放,PN结等效电容不会随外部环境变化而变化,所以,固定时间内PN结等效电容的电压只和PN结等效电流源的大小有关,检测PN结等效电容电压,就可以计算出PN结等效电流源的电流大小,这样就解决了PN结等效电流源的电流检测问题。
The present invention relates to the field of semiconductors, and discloses an LED light sensor and a detection method. An LED light sensor includes a microcontroller, an AD analog-to-digital conversion module inside a microcontroller, and an LED. The invention adopts the solution of detecting the PN junction equivalent capacitor voltage, and does not need to use a high-precision ADC to convert the change of the measured PN junction equivalent current into the change of the equivalent junction capacitance voltage of the PN junction, so as to solve the problem of detecting the tiny current. The PN junction equivalent current source is connected in parallel with the PN junction equivalent capacitor. When no external electric field is applied across the LED junction, the stored charge on the PN junction equivalent capacitor is released through the PN junction equivalent current source. The PN junction equivalent capacitor does not follow Therefore, the voltage of the PN junction equivalent capacitor in a fixed time is only related to the size of the PN junction equivalent current source. By detecting the PN junction equivalent capacitor voltage, the current of the PN junction equivalent current source can be calculated Size, so to solve the PN junction current source equivalent current detection problems.