LED driving power supply is a voltage converter that converts the power supply into a specific voltage and current to drive the LED to emit light. Usually, the input of LED driving power supply includes high voltage power frequency AC (That is, mains)
, Low voltage DC, high voltage DC, low voltage high frequency AC (Such as the output of an electronic transformer)Wait.
However, the output of LED driving power supply is mostly a constant current source that can change the voltage with the change of LED forward voltage drop value. Challenges faced by LED power supply;
**: Improve the service life and prolong the service time of lamps.
The overall life of the drive circuit, especially the life of key devices such as capacitors at high temperatures, directly affects the life of the power supply; Second: improve efficiency and improve the lighting efficiency of lamps.
LED drivers should challenge higher conversion efficiency, especially when driving high-power LED, because all power that is not output as light is dissipated as heat, and the conversion efficiency of power supply is too low, it affects the performance of LED energy saving effect; Third: reduce costs and improve purchasability. At present, the power is small (1-5 W)
The proportion of constant current drive power supply cost is close to 1/3, which is close to the cost of light source and affects the market promotion to some extent.
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