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At present, photosensitive resistors and photosensitive secondary tubes are widely used for brightness adjustment. Both of them are convenient to use in the field of light intensity automatic regulation. For example, school street lamps and street lamps can use photosensitive sensors to realize intelligent light adjustment function. It is very convenient. The external circuit uses the reverse connection function of photosensitive sensors. If it is daytime, street lamps can use photosensitive sensors. The voltage will be reduced to zero. If it is at night, the voltage of the street lamp will rise to a certain value, which will make the street lamp turn on, so that the street lamp can not be controlled manually and realize full intelligence.
I believe that in the near future, as long as there are lights, the circuit of photosensitive sensor to adjust brightness will be widely used. When we play with the screen of mobile phone at night, the brightness of mobile phone is very dazzling, which will seriously damage the eyes. At this time, we also apply the principle of automatic brightness adjustment to achieve this function. When the brightness of the outside world is very dark, the screen of mobile phone can be automatically adjusted. Save its brightness, make its brightness to a certain range, until appropriate, as well as computer screen display, so that not only save electricity, but also protect the eyes, this field has been widely used now.
Photodiode is also called photodiode. Photodiode is similar to semiconductor diode in structure. Its core is a photosensitive PN junction with unidirectional conductivity, so reverse voltage is needed when working. In the absence of light, there is a small saturated reverse leakage current, i.e. dark current, when the photodiode is cut off. When illuminated, the saturated reverse leakage current increases greatly, forming photocurrent, which varies with the intensity of incident light. When light irradiates the PN junction, the electron-hole pair can be generated in the PN junction, and the density of minority carriers can be increased. These carriers drift under the reverse voltage, which increases the reverse current. Therefore, light intensity can be used to change the current in the circuit. Common 2CU, 2DU series.
Modules are widely used:
1. Switching power supply 2. Various inverters 3. Welder 2.4. Ultrasound Cleaner5. Uninterruptible Power Supply (UPS)6, Induction Heating and Melting7. Continuous Diode of Converter8. Inverse Parallel Diodes of High Frequency Switching Devices 9. Frequency Converters
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