There are two power supply methods for power supply, namely constant current and constant voltage. It is mainly to change the current or voltage to control the brightness of the lighting lamps. Moreover, this equipment adjusts the current supplied to the LED light-emitting tube, and finally achieves the purpose of adjusting the brightness. In fact, LED has very strict standards for supply voltage and current. If the voltage and current are too high, it will seriously reduce the overall service life of the device.

A better LED desk lamp will have a constant current circuit, reducing the output of the current, the brightness will also decrease, so changing the resistance value of the series resistor in the LED can also adjust the brightness, but this efficiency is relatively low.

In the actual production process, this kind of power supply also has many types, but usually adjust the current to achieve the purpose of dimming, because the LED needs a constant voltage, so changing the current can change the power, so as to change the brightness of the LED. The purpose, of course, in this process can also be used in the way of thyristor dimming to achieve the purpose.

To ensure the quality of the led power supply, it is necessary to go through a series of process control from the beginning of product development, product finalization at the beginning of research and development, product selection verification, product construction research and development testing, production process research, product trial production verification, etc. And improvement.