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Advantages and Disadvantages of Driving Mode of Constant Voltage LED Power Supply

Advantages and Disadvantages of Driving Mode of Constant Voltage LED Power Supply

Constant voltage led power supply adopts constant voltage driving mode. This driving mode can sample the output voltage at the load end. The feedback loop of linear regulated power supply is the most typical constant voltage control application. This method is also the earliest LED driving mode. When a LED is driven by constant voltage mode, the way to control the forward current of the LED is to use a voltage source and a rectifier resistor through LED V-I curve, to determine the voltage required to produce the expected forward current to the LED.

However, in the process of the design of constant voltage led power supply, the method of controlling the forward current of LED has an obvious disadvantage, that is, any change of the forward voltage of LED will lead to the change of the current of LED. In the face of this problem, the common method is to use multi-branch current sharing technology, which can adopt integrated transistors to keep the current of each LED consistent. These transistors produce the same resistance value under the same temperature and process conditions, which can ensure that the current of each circuit is basically the same.

However, the range of forward voltage drop among LED individuals is relatively large. From the VF-IF curve, it can be seen that the small change of VF will cause a larger change of IF, which will lead to a larger change of brightness. Therefore, the use of constant voltage LED power supply can not guarantee the consistency of LED brightness, and affect the reliability, life and optical decay of the LED.

Constant voltage led power supply for your choice:
60W Constant Voltage Waterproof LED Power Supply
150W Constant Voltage Waterproof LED Driver
36W AC/DC Constant Voltage LED Driver Power Supply
24W AC/DC Constant Voltage LED Driver Power Supply
100W Quad Output Switching Power Supply
350W Quad Output Switching Power Supply
60W Single Output Switching Power Supply
250W Quad Output Switching Power Supply
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