1. Constant current led drive type:

The output current of the constant current drive circuit is constant, and the output DC voltage varies within a certain range with the size of the load resistance. The smaller the load resistance, the lower the output voltage. The larger the load resistance, the higher the output voltage.

①The constant current drive circuit is ideal for driving LEDs, but the price is relatively high;

②The constant current circuit is not afraid of short-circuit of the load, but it is strictly forbidden to open the load;

③Pay attention to the maximum withstand current and voltage value used, which limits the number of LEDs used.

2. Constant voltage led drive type:

When the various parameters in the constant voltage circuit are determined, the output voltage is fixed, but the output current changes with the increase or decrease of the load.

① Constant voltage circuit is not afraid of load open circuit, but load short circuit is strictly prohibited.

②The change of rectified voltage will affect the brightness of LED.

③For each string to drive the LED to display uniform brightness, add an appropriate resistor.

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