Classification of LED drive power(2)

- Nov 20, 2018-

Sort by drive mode

(1) the constant flow

The output current of the constant current drive circuit is constant, while the output dc voltage varies within a certain range with the size of the load resistance value. If the load resistance value is small, the output voltage will be low. The higher the load resistance value is, the higher the output voltage will be.

The constant current circuit is not afraid of load short circuit, but the load is strictly forbidden to open.

Constant current drive circuit driving LED is relatively ideal, but relatively high price;

It should be noted that the maximum allowable current and voltage is used, which limits the number of leds used.

(2) voltage type

When the parameters in the voltage stabilizing circuit are determined, the output voltage is fixed, while the output current changes with the increase and decrease of the load.

The voltage stabilizing circuit is not afraid of load opening, but it is strictly forbidden to short circuit the load.

The LED is driven by the stabilized voltage drive circuit, and the average display brightness of each LED can be achieved by adding appropriate resistance.

The brightness is affected by the voltage change from the rectifier.