Title:
DISCHARGE LAMP LIGHT CONTROL DEVICE
Document Type and Number:
Japanese Patent JP2004146329
Kind Code:
A
Abstract:
To supplement deterioration of arc voltage that is impressed on an AC load circuit 50 in a long "On" period, and operate stably the light control in a light control device by the duty control of switching elements 31, 32.
The light control device comprises an auxiliary diode 80 which is arranged at a position that becomes forward series with a first switching element 31 on the side of a longer On period and becomes reverse series with a first flywheel diode 41, and an auxiliary capacitor 90 that is arranged in parallel with the auxiliary diode 80 and has an appropriately small capacity.
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Inventors:
KAMOGAWA TAKEHIKO
SAKUMA SEIJI
SAKUMA SEIJI
Application Number:
JP2002349104A
Publication Date:
May 20, 2004
Filing Date:
October 25, 2002
Export Citation:
Assignee:
HITACHI LIGHTING LTD
International Classes:
H05B41/24; H02M7/5387; H05B41/392; (IPC1-7): H05B41/392; H02M7/5387; H05B41/24