Discharge lamp lighting device, method of controlling...

Details Discharge lamp lighting device, method of controlling... Discharge lamp lighting device, method of controlling...

2011-06-07

2011-06-07

Le, Que T (Department: 2878)

Radiant energy

Photocells; circuits and apparatus

Photocell controlled circuit

C250S205000, C315S246000, C353S085000

Reexamination Certificate

active

07956315

ABSTRACT:
A discharge lamp lighting device includes: a power control circuit adapted to generate discharge lamp driving power; an alternating current conversion circuit adapted to execute polarity reversal on a direct current output from the power control circuit, thereby generating an alternating current; and a control section adapted to perform alternating current conversion control of controlling the polarity reversal timing of the alternating current, wherein the control section executes a steady drive process of executing the alternating current conversion control at a given frequency, a first low frequency drive process of executing the alternating current conversion control at a first low frequency driving frequency lower than the given frequency, and starting from a first polarity and ending with the first polarity, and a second low frequency drive process of executing the alternating current conversion control at a second low frequency driving frequency lower than the given frequency, and starting from a second polarity and ending with the second polarity.

REFERENCES:
patent: 7768215 (2010-08-01), Shiwei et al.
patent: 7845805 (2010-12-01), Okamoto et al.
patent: A-1-112698 (1989-05-01), None
patent: A-2006-59790 (2006-03-01), None

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