公开(公告)号：AU2003248916A1

公开(公告)日：2003-09-16

申请号：AU2003248916

申请日：2003-02-26

Applicant: PHILIPS INTELLECTUAL PROPERTY

Inventor： LURKENS PETER ,  MONCH HOLGER

IPC: H05B41/282 ,  H05B41/292

Abstract: The invention relates to an electronic circuit and a method of supplying energy to a high-pressure gas-discharge lamp H, 65, 75 . The electronic circuit comprises a line-supply input section 62, 72 to receive and convert an a.c. voltage from an a.c. line-supply system 61, 71 , an energy storage means 63, 73 to store the energy put out by the line-supply input section 62, 72 and a lamp-current regulating unit 64, 74 that is supplied with an input voltage U 1 by the line-supply input section 62, 72 via the energy storage means 63, 73 and that makes available a lamp current I 2 for a high-pressure gas-discharge lamp II, 65, 75 . To make it possible for the energy storage means 63, 73 to be particularly small, it is proposed that the lamp-current regulating unit 64, 74 have a power section L, D, C, S, A 1 , A 2 , K having a transconductive property. If there is a drop in the input voltage U 1 , this property then automatically produces a reduction in the lamp current I 2 made available to a high-pressure gas-discharge lamp 65, 75 , H. This ensures a particularly fast adjustment to voltage fluctuations. The invention also relates to a corresponding method.

公开(公告)号：AU2003206098A1

公开(公告)日：2003-09-22

申请号：AU2003206098

申请日：2003-03-10

Applicant: PHILIPS INTELLECTUAL PROPERTY

Inventor： LURKENS PETER

IPC: H05B41/24 ,  H05B41/18 ,  H05B41/288 ,  H05B41/00

公开(公告)号：AU2002356383A1

公开(公告)日：2003-07-15

申请号：AU2002356383

申请日：2002-12-18

Applicant: PHILIPS INTELLECTUAL PROPERTY

Inventor： LURKENS PETER

IPC: H05B41/24 ,  H05B41/288

Abstract: The invention relates to an electronic circuit and to a method of operating a high-pressure lamp in various operational modes. The circuit comprises a DC-AC converter consisting of two bridges (110-1) and (110-2). A series circuit comprising a first coil L1, the high-pressure lamp (120), and a second coil L2 is connected between the outputs (112-1) and (112-2) of these two half bridges. The invention has for its obeject to develop such a known circuit further such that it is equally suitable for an ignition mode and for a normal operational mode of the high-pressure lamp, without individual components having to be overdimensioned. According to the invention, this object is achieved in that a first capacitor C1 is connected in a path from the junction point of the first coil L1 and the high-pressure lamp (120) either to a reference potential (-) or to an operating potential (+), and in that a second capacitor C2 is connected in the path from the junction point of the high-pressure lamp (120) and the second coil L2 either to the reference potential (-) or to the operating potential (+) or in parallel to the high-pressure lamp (120).

公开(公告)号：AU2002356382A1

公开(公告)日：2003-07-15

申请号：AU2002356382

申请日：2002-12-18

Applicant: PHILIPS INTELLECTUAL PROPERTY

Inventor： LURKENS PETER ,  DEPPE CARSTEN ,  RIEDERER XAVER

IPC: G03B21/00 ,  G09G3/20 ,  H04N5/74 ,  H05B41/292 ,  H05B41/38 ,  H05B41/392 ,  H05B41/39

Abstract: The invention relates to an image projector with a High-Intensity-Discharge HID lamp ( 112 ) and a method of operating it. Such lamps have the disadvantage that their voltaic arc jumps back and forth between different positions at unforeseeable times during operation. This so-called arc jumping has the effect of changing the brightness, i.e. the overall brightness and/or the brightness distribution of the light emitted by the HID lamp ( 112 ). For the viewer of an image projected with such a projector, this effect appears as a jolt of this projected image. To avoid such effects for the viewer, it is first proposed according to the invention that changes in the brightness of the light in the image projector's beam path are detected. As soon as a change in brightness caused by an arc jump has been detected, this brightness is reset to a brightness detected at a moment t- 2 before the arc jump, in order subsequently to convert it during a predetermined time interval T to the brightness resulting from the arc jump. This resetting must occur so soon after the arc jump, and the conversion so slowly, that the changes in the brightness of the light incident on a picture screen device ( 118 ) resulting from the arc jump, the reset, and the conversion are not perceptible to the human eye.

公开(公告)号：AU2003209949A1

公开(公告)日：2003-10-13

申请号：AU2003209949

申请日：2003-03-24

Applicant: PHILIPS INTELLECTUAL PROPERTY

Inventor： LURKENS PETER ,  DEPPE CARSTEN

IPC: G03B21/14 ,  G09G3/20 ,  G09G3/34 ,  G09G3/36 ,  H04N9/31