Patent ID: 9035554
Filing Date: 2015-05-19
Classification: H05B

Abstract:
1. A three-stage power adjustable Light Emitting Diode bulb, comprising: a first resistance unit electrically connected in parallel to a second resistance unit, said first resistance unit and said second resistance unit having different values, one end of the first resistance unit and one end of the second resistance unit being connected to define a node, the node being connected to an end of a rectifier; a switch having plurality of stages, said switch being connected to the first and second resistance units, the other end of said first resistance unit being connected to a first one of the plurality of stages of said switch, the other end of said second resistance unit being connected to a second one of the plurality of stages of said switch, and both other ends of said first resistance unit and said second resistance unit are connected to a third one of the plurality of stages of said switch, whereby enabling said first one of the plurality of stages of said switch passes current through only said first resistance unit, enabling said second one of the plurality of stages of said switch passes current through only said second resistance unit, and enabling said third one of the plurality of stages of said switch passes current through both said first resistance unit and said second resistance unit; and multiple Light Emitting Diode units and a limiting resistance connected between positive and negative poles of the rectifier, the Light Emitting Diode units each having multiple Light Emitting Diodes.