For Low-Power Leds, What Is The Power Supply Solution For Taking Power From The 220v Ac Mains

Writer：Jane Time：2021-06-30 Browse：173

Q: For low-power LEDs, what is the power supply solution for taking power from the 220V AC mains?

     A: The easiest way to get power from the AC220V AC mains is to use capacitor current limiting and buck, but the disadvantage is that the LED is charged, unsafe, and the power factor is very low. The best way is to use switching power supply converter, make it a constant current off-type power supply, the output current constant and adjustable, but also pay attention to the design of the input power factor to be high. The latter already has many mature circuits, but designers still need to work on switching power technology.