Tech
19 Sep 2026
5 min read
Power Architecture Inside a Wi-Fi Smart LED Bulb
A mains-powered smart LED bulb has two electrical jobs that should not be collapsed into one. Its LED array needs controlled current at a voltage determined by the LED string, while its Wi-Fi or Bluetooth controller needs a stable low-voltage supply. A simplified architecture is: 220-240 V AC | input protection and rectification | +--> LED power stage --> R / G / B / WW / CW channels | +--> low-voltage supply --> MCU + Wi-Fi/Bluetooth + control logic The exact topology varies between products. The important boundary is the separation between LED power and logic power.