Abstract: Due to the existing range hood using SCR dimming, when the brightness of the LED lamp is lowered, there is occasional flicker of light phenomenon. Because the stroboscopic flash appears suddenly when the user uses the lamp, it affects the user's experience and causes the user to worry about the product. The dimming control circuit of AC floodlight is optimized by means of theoretical analysis and experimental verification, which can effectively reduce the voltage step of the floodlight at low brightness, so that the stroboscopic phenomenon cannot be perceived.

Key words: SCR, Stroboscopic, Step