Why use a constant current power supply to drive LED lamps?
The lifespan of LED refers to the time of light decay. Constant current drive controls the current of LED to ensure that the junction temperature of LED chip will not be too high, and prevents the abnormal aging of semiconductor chip, packaging material and fluorescent material. The luminous intensity of the LED will not decrease too quickly (ie light decay). The use of other types of power supply cannot control the current of the LED to be constant, and its temperature rise is not easy to control, which leads to the occurrence of light decay.
The luminous intensity of LED is proportional to the current. Therefore, the LED drive power supply needs to have constant current output characteristics to ensure that the LED can obtain stable luminous intensity and long life guaranteed by the manufacturer during use. In order to ensure constant current driving of LEDs, the LEDs must be connected in series to ensure that the current of each LED in the circuit is equal and constant. When the power demand of the LED light group is getting bigger and bigger, the number of LEDs connected in series will be more and more, and the voltage demand will be proportional to the number of series connection. As a result, the voltage will get higher and higher, safety problems will easily occur, and the requirements for manufacturing and use will be stricter. , which will increase the cost and make it difficult to use the power supply. Therefore, the drive of high-power LEDs has the requirement of low-voltage drive.
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