Patent ID: 6827466
Filing Date: 2004-12-07
Classification: F21S,F21Y

Abstract:
A color-varying decorative lamp comprising:at least one hollow body (10); at least one luminous member (20) received in the hollow body (10) wherein the at least one luminous member (20) is composed of three LEDs (L1, L2, L3) respectively emitting various monochromatic color lights; and a control unit (30) electrically connected with the at least one luminous member (20) for controlling brightness of the luminous member (20) and times to power on/off the luminous member (20), wherein the control unit (30) comprises a microprocessor (31) transmitting frequency conversion pulse signals from output terminals; an electronic switch group (32) provided between the output terminals of the microprocessor (31) and the luminous member (20) and having three electronic switches (Q2, Q3, Q4) respectively connected with the LEDs (L1, L2, L3); a regulation circuit (34) connected with a DC supply, the electronic switch group (32) and the microprocessor (31) being in parallel connection with the regulation circuit (34); a converting circuit (33) connected between an AC supply and the regulation circuit (34); and a control circuit (35) provided between the regulation circuit (34) and the microprocessor (31), the control circuit (35) including a transistor (352) having a collecting electrode connected with a power end of the microprocessor (31); a shift switch (351) which can be alternatively connected with the power end of the microprocessor (31) and an emitting electrode of the transistor (352); and a button switch (353) provided between a base electrode of the transistor (352) and the ground to control the conduction of the transistor (352).