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Lighting principle of solar road stud

The working principle of solar road studs can be simply explained as charging during the day and working with lights at night. But how does it work by sensing the intensity of external light? Next, we will introduce two modes to control its lighting:


There is a detection module in the solar controller, and there are generally two methods:
1) Use a photoresistor to detect the intensity of sunlight;
2) Use the voltage detection module to detect the output voltage of the solar panel.
Method 1: Use a photoresistor to detect light intensity
Photoresistors are particularly sensitive to light. When the light intensity is weak, the resistance is large. As the light becomes stronger, the resistance value decreases. Therefore, this feature can be used to detect the strength of the sun's rays and output it to the solar controller as a control signal for turning on and off the LED road stud lights.

A balance point can be found by sliding the rheostat. When the light is strong, the photoresistor value is small, the base of the triode is high level, the triode is not conducting, and the LED is not bright; when the light is weak, the resistance of the photoresistor is large, and the base Extremely low level, the triode is turned on, and the LED is lit.

However, the use of photoresistors has certain disadvantages. Photoresistors have relatively high installation requirements and are prone to miss control on rainy or cloudy days.
Method 2: Detect the voltage of the solar panel
The battery panel inside the solar LED road stud lights converts sunlight energy into electrical energy. The stronger the light, the higher the output voltage, and the weaker the light, the lower the output light. Therefore, the output voltage of the battery board can be used as a basis to turn on the street light when the voltage is lower than a certain level and turn off the street light when the voltage is higher than a certain level.
This method can ignore the impact of installation and is more direct.
One of the qualified standards for road studs is the sealing of the product, so whether it is voltage control or photoresistor control, it will not cause damage to these controlled internal components, no matter if it is the harsh road environment or rainy and snowy weather There is no doubt that the road studs can work normally under the condition of sufficient lighting and charging.

The above is about the reason why the solar road stud lights does not turn on during the day and turns on at night. In addition, solar street lighting is clean and environmentally friendly, and the installation is relatively simple. There is no need to lay electric lines, which saves a lot of manpower and material resources, and the installation efficiency is also improved. At the same time, it has good social and economic benefits.