Constant current led driver is a voltage converter that converts the LED driver into a specific voltage and current to drive LED light. In essence, it uses the device to feedback the current and dynamically adjusts the LED driver state of the equipment, so that the current tends to be constant. Under normal circumstances: the input of LED drivers includes high-voltage and power-frequency AC (i.e. commercial power), low-voltage DC, high-voltage DC, low-voltage high-frequency AC (such as the output of electronic transformer) and so on. The output of the LED drive LED driver is mostly a constant current source that can change the voltage with the change of the LED forward voltage drop.

Constant-current LED driver means that the output current is constant and does not change with the load under the condition of allowable load. Relatively speaking, the application of led constant current power is not as wide as that of constant-voltage. The high-power LED floodlight used in the plaza or hotel is driven by constant-current power. Constant-current LED driver is mainly used to protect electronic products from damage due to voltage changes.

For example, a 12v 1a led driver with constant current of 1 a, and max output up to 12v Its resistance in the circuit may be from 0 ~ 12 Ω changes, but its current will always remain the same, 1 a. When the resistance is more than 12 Ω into pressure limiting protection, constant current LED driver will take is a work area and refused to work.