The introduction of the LED power

The LED power supply is a constant current source, and the general switching power supply is a constant voltage source.

Working principle: LED has two requirements for power supply. Firstly, the output voltage is required to be > the on voltage of LED, and secondly, the working current is required to be stable and not greater than the rated current of LED. When the working current of the LED exceeds the rated current, the LED will soon be aged and damaged. Therefore, the power supply used by LED must have constant current function.

When designing the switching power supply for LED power, first determine the current of LED, and then determine the power supply voltage according to the number of lamp beads in series. The design takes the current as the main working parameter and the voltage as the auxiliary parameter.