Circuitry to reduce ripple for LED arrangement, uses detected light intensity of LEDs to adjust to nominal light intensity for LED traffic lights

摘要

Brightness, light output or light intensity of LED light source is directly used to change input setting resistance or setting current. Hence setting resistance functions as control resistance or setting current as control current. When control resistance or current very quickly changes value when specific minimum light intensity is reached, back coupling effect is used to reduce ripple without need of large, expensive capacitors. Independent claim for 1) procedure to reduce ripple for LED arrangement 2) circuitry for LED arrangement with at least two parallel LED chains.