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：AU2002348879A1

公开(公告)日：2003-07-15

申请号：AU2002348879

申请日：2002-12-09

Applicant: PHILIPS INTELLECTUAL PROPERTY

Inventor： MONCH HOLGER

IPC: G03B21/00 ,  F21S10/00 ,  F21V9/40 ,  H04N9/31

Abstract: The invention relates to a video projection system comprising at least a light source coupled to a reflector for focusing the light beam, a motor-driven color wheel having a plurality of light-transmitting segments, at least some of said segments being dichroic filters for the colors red, green, and blue, while the speed of rotation of said wheel can be modified by a control, a lens system imaging the focused light beam onto a display, a display system comprising at least a display and a display control, and a projection lens, wherein the video projection system has a video projection mode and a lighting mode, and in addition the color wheel is stationary in the lighting mode and at least one segment of the color wheel can be given a defined position in the beam.