1.The working principle of led driver
The principle of LED driver circuit is that when more led products need to be used, if all the LED in series, the LED driver will need to output a higher voltage:
If all leds are connected in parallel, the LED driver needs to output a large current. All the LED series or parallel, not only limits the heavy use of LED, and parallel LED load current is larger, the cost of the driver will increase, the solution is to use the hybrid mode. The number of LED in series and parallel is equally distributed. The voltage distributed in a series branch of LED is the same. The current on each LED in the same series branch is basically the same, with the same brightness, and the current through each series branch is similar.
2.The role of led driver
LED driving power is the key to LED lamps, it is like a person’s heart, to manufacture high-quality, used for lighting LED lamps must give up the constant voltage drive LED. Constant current source drive is the best LED driving mode, the use of constant current source drive, without the output circuit in series current limiting resistance, LED flowing current is not affected by the external power supply voltage changes, environmental temperature changes, and LED parameters discrete, so as to keep the current constant, give full play to the LED’s various excellent characteristics.
The LED constant current power supply is used to power LED lamps. Because the current flowing through the LED will be automatically detected and controlled during the power supply, there is no need to worry about the high current flowing through the LED at the moment of power-up, and there is no need to worry about the load short circuit burning the power supply.
Using constant current driving mode, it can avoid the change of LED positive voltage caused by current changes, at the same time the constant current makes the LED brightness stability, but also convenient for LED lighting factory to implement mass production to ensure the consistency of the product, so many manufacturers have fully recognized the importance of driving power, many LED lighting manufacturers have given up the constant voltage mode, And choose a slightly higher cost of constant current mode to drive LED lamps.