HIGH VOLTAGE DISCHARGE LAMP LIGHTING APPARATUS AND ILLUMINATING EQUIPMENT

Title:

HIGH VOLTAGE DISCHARGE LAMP LIGHTING APPARATUS AND ILLUMINATING EQUIPMENT

Document Type and Number:

WIPO Patent Application WO/2008/023476

Kind Code:

A1

Abstract:

A lighting apparatus comprises a power converting circuit (3) that includes a plurality of switching elements (Q2-Q6) and an inductance element (L2) and that power converts an input from a DC power supply (2) and then supplies it as a rectangular wave output to a high voltage discharge lamp (DL); and a control circuit (9) that controls the switching elements (Q2-Q6) of the power converting circuit (3). The control circuit (9) has a first lighting control for controlling the switching element (Q2) of the power converting circuit (3) to flow a current up to a predetermined peak value for each switching period; and a second lighting control for supplying a desired power during a stable lighting of the high voltage discharge lamp (DL). The control circuit (9) switches between the first and second lighting controls in accordance with a lighting state of the high voltage discharge lamp (DL).

Inventors:

KUMAGAI JUN
NAGATA SATORU
SATO KEISUKE
KOMATSU NAOKI

Application Number:

PCT/JP2007/058534

Publication Date:

February 28, 2008

Filing Date:

April 19, 2007

Export Citation:

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Assignee:

MATSUSHITA ELECTRIC WORKS LTD (JP)
KUMAGAI JUN
NAGATA SATORU
SATO KEISUKE
KOMATSU NAOKI

International Classes:

H05B41/24; H05B41/282

Foreign References:

JP2006147363A	2006-06-08
JP2005190927A	2005-07-14
JP2005019337A	2005-01-20
JP2001313193A	2001-11-09
JP2002352987A	2002-12-06
JPH07114993A	1995-05-02
JP2003031393A	2003-01-31
JP2003217888A	2003-07-31
JPH07230883A	1995-08-29
JPS60250599A	1985-12-11

Other References: