DISCHARGE LAMP LIGHTING DEVICE AND LUMINARIES - MATSUSHITA ELECTRIC WORKS LTD

Title:

DISCHARGE LAMP LIGHTING DEVICE AND LUMINARIES

Document Type and Number:

WIPO Patent Application WO/2008/023522

Kind Code:

A1

Abstract:

A minimum lamp voltage detection means which is equipped with one output power characteristic curve for supplying a constant power for the rated lamp voltage range of a discharge lamp and with a plurality of output power characteristic curves (W1, W2, W3) for a lamp voltage up to the rated lamp voltage range, and which detects a minimum lamp voltage after transition to arc discharge when lamp power is supplied to a high pressure discharge lamp based on an initially set output power characteristic curve after the high pressure discharge lamp is started is provided. The larger the minimum lamp voltage detected by the minimum lamp voltage detection means with in a predetermined minimum lamp voltage range, the larger output power characteristic curve is reset from the plurality of output power characteristic curves (W1, W2, W3), and then subsequent power control is performed.

Inventors:

FUKUDA KENICHI
MATSUZAKI NOBUTOSHI

Application Number:

PCT/JP2007/064409

Publication Date:

February 28, 2008

Filing Date:

July 23, 2007

Export Citation:

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Assignee:

MATSUSHITA ELECTRIC WORKS LTD (JP)
FUKUDA KENICHI
MATSUZAKI NOBUTOSHI

International Classes:

H05B41/24

Foreign References:

JP2003338392A	2003-11-28
JP2003338391A	2003-11-28
JP2001503907A	2001-03-21
JP2003338390A	2003-11-28
JP2871891B2	1999-03-17

Other References: