POWER SUPPLY DEVICE AND ILLUMINATION SYSTEM WITH THE SAME

PROBLEM TO BE SOLVED: To suppress application of a reverse voltage to a plurality of light-emitting diodes connected in series and a defect in light emission of the light-emitting diodes accompanying the application. SOLUTION: An illumination system includes an illumination device 10 having a plural...

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Bibliographic Details
Main Authors WATANABE TAKEO, YASUDA TAKENORI, TOMITA HIROYUKI
Format Patent
LanguageEnglish
Published 28.01.2010
Subjects
BASIC ELECTRIC ELEMENTS
ELECTRIC HEATING
ELECTRIC LIGHTING NOT OTHERWISE PROVIDED FOR
ELECTRIC SOLID STATE DEVICES NOT OTHERWISE PROVIDED FOR
ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
ELECTRICITY
SEMICONDUCTOR DEVICES
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Summary:PROBLEM TO BE SOLVED: To suppress application of a reverse voltage to a plurality of light-emitting diodes connected in series and a defect in light emission of the light-emitting diodes accompanying the application. SOLUTION: An illumination system includes an illumination device 10 having a plurality of blue LEDs connected in series, a first protective diode 91 and a second protective diode 92 connected to both ends of the illumination device 10 respectively, a first protective capacitor 93 having one end connected to the cathode of the first protective diode 91 and the other end grounded, a second protective capacitor 94 having one end connected to the anode of the second protective diode 92 and the other end grounded, a diode bridge circuit 35 rectifying an alternating current supplied by a first feeder 21 and a second feeder 22 into a direct current, a smoothing capacitor 36 having one end connected to the anode of the first protective diode 91 and the other connected to the cathode of the second protective diode 92, and a switch 40 electrically connecting and disconnecting the second feeder 22. COPYRIGHT: (C)2010,JPO&INPIT
Bibliography:Application Number: JP20080181768