There are two types of LED drive power supplies: constant voltage power supply and constant current power supply.

Constant voltage type: the current does not change and the voltage changes within a certain range (with load changes, it is strictly forbidden to short-circuit the load), the brightness of the LED will be affected by the voltage change from the rectification, so each string needs to add a suitable resistance to make the brightness of the LED average.

Constant current type: constant voltage and current changes within a certain range (as the load changes, the load is forbidden to open completely, the smaller the load resistance, the lower the output voltage, the larger the load resistance, the higher the output voltage), pay attention to the current when using The maximum withstand value of the voltage and limit the number of LEDs used.

There are three matching modes for LED lights: parallel, series, and parallel series.