LIGHTING DEVICE AND LIGHTING FIXTURE

PROBLEM TO BE SOLVED: To achieve life prolongation by suppressing deterioration of an electrolytic capacitor.SOLUTION: In a control part 5, except that when all light sources parts 1 and 2 are turned off, the duty ratio of a switching power supply circuit of respective lighting circuit parts 3 and 4...

Full description

Saved in:
Bibliographic Details
Main Authors TSUJIMURA MITSUHIRO, MITSUJIMA KOICHI, MANNAMI HIROAKI, JINBO KATSUYOSHI
Format Patent
LanguageEnglish
Published 10.12.2012
Subjects
ELECTRIC HEATING
ELECTRIC LIGHTING NOT OTHERWISE PROVIDED FOR
ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
ELECTRICITY
Online AccessGet full text

Cover

More Information
Summary:PROBLEM TO BE SOLVED: To achieve life prolongation by suppressing deterioration of an electrolytic capacitor.SOLUTION: In a control part 5, except that when all light sources parts 1 and 2 are turned off, the duty ratio of a switching power supply circuit of respective lighting circuit parts 3 and 4 is increased and decreased in a range of 100% from a predetermined lower limit value (for example 1%) which is higher than 0%. Accordingly, even when the a light control ratio is set the lowest, a minute current can be made to continuously flow through smooth capacitors C1 of the lighting circuit parts 3 and 4, thereby preventing the smooth capacitors C1 from being left to stand under high temperature environment in a non-contact state. As a result, deterioration of the smooth capacitors C1 (electrolytic capacitors) is suppressed and life prolongation of a lighting device can be achieved.
Bibliography:Application Number: JP20110110403