Title:
ガス放電ランプ駆動方法及び装置
Document Type and Number:
Japanese Patent JP2005522818
Kind Code:
A
Abstract:
A method for dimming a gas discharge lamp, such as an HID lamp including an MH lamp, includes operating the lamp at nominal power with commutating DC current having a current magnitude IL=alphaInom, alpha being equal to 1 or less than 1. The current magnitude IL is reduced, but the lamp still is operated at commutating DC current, until alpha reaches a predetermined value beta. Then, the lamp is operated at DC current, and the current magnitude is reduced further, thus achieving a lower dimming level.
Inventors:
Oscar Yeah Dual
Application Number:
JP2003548597A
Publication Date:
July 28, 2005
Filing Date:
November 14, 2002
Export Citation:
Assignee:
Koninklijke Philips Electronics N.V.
International Classes:
H05B41/24; H05B41/282; H05B41/288; H05B41/292; H05B41/38; H05B41/392; (IPC1-7): H05B41/24; H05B41/282; H05B41/392
Domestic Patent References:
| JP2002134294A | 2002-05-10 | |||
| JPH06251891A | 1994-09-09 | |||
| JPH08222380A | 1996-08-30 | |||
| JPS60148096A | 1985-08-05 |
Attorney, Agent or Firm:
Kosaku Sugimura
Kazuaki Takami
Hiroshi Tokunaga
Shiro Fujitani
Kiyoshi Kuruma
Kazuyuki Tomita
Kazuaki Takami
Hiroshi Tokunaga
Shiro Fujitani
Kiyoshi Kuruma
Kazuyuki Tomita