EP1280387A2 - Circuit électronique pour lampe à forte décharge et dispositif de projection d' images - Google Patents

Circuit électronique pour lampe à forte décharge et dispositif de projection d' images Download PDF

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Publication number
EP1280387A2
EP1280387A2 EP02016738A EP02016738A EP1280387A2 EP 1280387 A2 EP1280387 A2 EP 1280387A2 EP 02016738 A EP02016738 A EP 02016738A EP 02016738 A EP02016738 A EP 02016738A EP 1280387 A2 EP1280387 A2 EP 1280387A2
Authority
EP
European Patent Office
Prior art keywords
lamp
electronic circuit
hid lamp
brightness
sensor
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP02016738A
Other languages
German (de)
English (en)
Other versions
EP1280387B1 (fr
EP1280387A3 (fr
Inventor
Peter Dr. Philips Corp. Int. Prop. GmbH Lürkens
Carsten Philips Corp. Inte. Prop. GmbH Deppe
Holger Dr. Philips Corp. Inte. Prop. GmbH Mönch
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Philips Intellectual Property and Standards GmbH
Koninklijke Philips NV
Original Assignee
Philips Intellectual Property and Standards GmbH
Philips Corporate Intellectual Property GmbH
Koninklijke Philips Electronics NV
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Philips Intellectual Property and Standards GmbH, Philips Corporate Intellectual Property GmbH, Koninklijke Philips Electronics NV filed Critical Philips Intellectual Property and Standards GmbH
Publication of EP1280387A2 publication Critical patent/EP1280387A2/fr
Publication of EP1280387A3 publication Critical patent/EP1280387A3/fr
Application granted granted Critical
Publication of EP1280387B1 publication Critical patent/EP1280387B1/fr
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B41/00—Circuit arrangements or apparatus for igniting or operating discharge lamps
    • H05B41/14—Circuit arrangements
    • H05B41/16—Circuit arrangements in which the lamp is fed by dc or by low-frequency ac, e.g. by 50 cycles/sec ac, or with network frequencies
    • H05B41/20—Circuit arrangements in which the lamp is fed by dc or by low-frequency ac, e.g. by 50 cycles/sec ac, or with network frequencies having no starting switch
    • H05B41/23—Circuit arrangements in which the lamp is fed by dc or by low-frequency ac, e.g. by 50 cycles/sec ac, or with network frequencies having no starting switch for lamps not having an auxiliary starting electrode
    • H05B41/231—Circuit arrangements in which the lamp is fed by dc or by low-frequency ac, e.g. by 50 cycles/sec ac, or with network frequencies having no starting switch for lamps not having an auxiliary starting electrode for high-pressure lamps
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B41/00—Circuit arrangements or apparatus for igniting or operating discharge lamps
    • H05B41/14—Circuit arrangements
    • H05B41/36—Controlling
    • H05B41/38—Controlling the intensity of light
    • H05B41/39—Controlling the intensity of light continuously
    • H05B41/392—Controlling the intensity of light continuously using semiconductor devices, e.g. thyristor
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B47/00—Circuit arrangements for operating light sources in general, i.e. where the type of light source is not relevant
    • H05B47/20—Responsive to malfunctions or to light source life; for protection

Definitions

  • the invention relates to an electronic circuit for operating a high-intensity discharge HID lamp, in particular an ultra-high-pressure UHP lamp according to the preamble of patent claim 1.
  • the invention further relates to an image projector with the electronic circuit according to claim 1.
  • HID and UHP lamps are generally known in the prior art. They are preferably used for projection purposes, but also e.g. used to operate car headlights. They are characterized by a very small arc and a high luminous efficacy, which advantageously leads to a very good overall efficiency. The brightness of these lamps is about two to four times that of other gas discharge lamps.
  • HID lamps have the effect of archery, i.e. a change in the position of the arc while these lamps are operating.
  • the change in the arc position changes the proportion of the light generated by the lamp as a whole, which reaches the imaging system, so that the brightness of the projected image fluctuates.
  • This effect also leads to undesirable fluctuations in the brightness distribution on the image generator.
  • a flicker effect is perceptible to the viewer.
  • a first approach provides for an additional high current pulse in the course of the lamp current before it is commutated. Due to this special form of lamp current, archery and thus the flicker effect can be effectively suppressed.
  • the provision of the high current pulse has the disadvantage, on the one hand, that the lamp driver becomes larger and more expensive than with a different lamp current, and, on the other hand, that the service life of the HID lamp is significantly reduced.
  • JP-2000028988 A discloses an LCD projector with an optical system 420 and an electrical circuit.
  • the optical system 420 comprises a gas discharge lamp 422 with a reflector 421 and, downstream of the lamp, an integrator 423, an image generator 424 and an objective 425b.
  • the integrator 423 together with a condenser 425a ensures a uniform brightness distribution when illuminating the image generator 424 and thus in the image generated by the image generator.
  • the electrical circuit is used to operate the lamp 422. It comprises a lamp driver 410 for providing a regulated lamp current for the lamp 422 in response to a control signal and a brightness sensor 430 for generating and outputting a sensor signal.
  • the sensor signal represents the amount of light emitted by the lamp at the location of the brightness sensor.
  • the quantity of light represented by the sensor signal is compared in a microprocessor 440 with a predetermined reference quantity of light, in order then to generate the control signal in accordance with the measured quantity of light deviation and to output it to the lamp driver. In this way, the amount of light emitted is adjusted to the reference value. A flicker effect can be prevented if the light quantity control is done quickly enough.
  • this second approach has the following disadvantages: Due to the fact that the lamp is operated with a lower than the nominal power from the outset, the brightness generated is significantly lower than at nominal power, i.e. such a projector system requires a larger lamp to generate the same brightness from the start as a system without it Type of scheme.
  • HID lamps are also characterized by a sensitive thermal equilibrium that can only be maintained sufficiently at rated power. In the event of deviations, disadvantages in the service life are to be expected, so that the regulation in the manner of JP-2000028988 A can be expected to have a shorter service life.
  • the brightness sensor in the known circuit should not only work reliably at room temperature, but also at high temperatures inside an image projector.
  • the high-pass filter filters out very low frequency components of the brightness fluctuations and in particular their direct components from the sensor signal. These frequency components are therefore also missing in the control signal and are not taken into account when regulating the HID lamp.
  • the remaining alternating components of the brightness fluctuations are regulated to zero instead of - as in the prior art - regulating the absolute brightness to a predetermined reference value.
  • this has the advantage that effects of faulty offsets or faulty sensitivities of the brightness sensor are filtered out of the sensor signal and thus have no undesired effect on the control.
  • Simple and inexpensive sensors can therefore very well be used in the implementation of the circuit claimed, without the quality of the control being adversely affected.
  • the high-pass filter advantageously enables the brightness fluctuations to be regulated by the circuit during the entire life of the HID lamp.
  • the regulation is possible according to the invention, particularly in the case of nominal power operation, both in the positive and in the negative direction.
  • a control unit within the lamp driver is also designed to control the electrical power generated at the output of the control unit in such a way that the HID lamp is constantly operated at the nominal power level in the long term.
  • this maximizes the service life of the lamp and, on the other hand, it ensures that the luminous efficacy of the lamp is at a maximum during its entire service life.
  • the object of the invention is further achieved by the subject matter of claim 7.
  • the advantages of the image projector claimed there essentially correspond to the advantages mentioned above with regard to the electronic circuit.
  • the human eye is particularly sensitive to flicker effects when displaying still images with large, monochrome areas. Suppression of this effect is therefore particularly advantageous here.
  • FIG. 1 shows an electronic circuit for operating an HID lamp, in particular a UHP lamp, according to the invention. It comprises a lamp driver 110, a brightness sensor 130 and a filter 140.
  • the lamp driver 110 is designed as a control unit and serves to provide and control a lamp current for the operation of the HID lamp 322 in response to a control signal, so that the amount of light emitted by the HID lamp at the location of the brightness sensor 130 is constant in the medium term.
  • the sensor signal generated by the brightness sensor 130 in FIG. 1 represents the amount of light emitted by the HID lamp at the location of the brightness sensor 130.
  • Filtering in a filter 140 converts the sensor signal into the control signal.
  • the filter 140 is preferably designed as a high-pass filter, so that in particular the direct component is filtered out of the sensor signal and thus also from the control signal.
  • this has the advantage that certain measurement errors of the brightness sensor 130 do not have a negative effect on the result of the control.
  • the control signal which is high-pass filtered according to the invention only represents the alternating component in the original sensor signal, ie only the actual brightness fluctuations.
  • the brightness fluctuations can be caused, for example, by the arc jumping described above or by a transition of the lamp from a diffuse arc state to a concentrated arc state (spot mode).
  • the primary aim of the control by the lamp driver 110 is to generate a stabilized brightness without rapid fluctuations, in particular at the location of the brightness sensor 130. This is achieved in that the lamp driver 110 designed as a control unit strives to keep the control signal at zero or zero internregeln.
  • the lamp driver 110 is able at any time to carry out a positive or negative correction / regulation of the brightness if this should be necessary in order to keep the brightness essentially constant.
  • the filter 140 can also be designed as a band pass filter, ie as a combined high and low pass filter. It then preferably has a lower cut-off frequency of less than 1 Hz and an upper cut-off frequency of more than 100 Hz, depending on the lamp type and projection system.
  • the upper limit frequency is advantageously above the brightness fluctuation frequency which is perceptible to the human eye.
  • the bandpass filter advantageously also results in a limitation in the upper frequency range. This simplifies the requirements for the design of the lamp driver 110 in that the stability can be achieved much more easily with high quality than with a control signal that is only high-pass filtered.
  • the transfer function of the filter 110 can also be designed such that the filter not only enables low-pass or high-pass filtering, but also amplification of the sensor signal to generate the control signal.
  • the lamp driver 110 is also designed to regulate the electrical power at its output - and thus also the electrical power consumption of the lamp - in the long term constantly at the nominal power level. This is usually done by monitoring the product of lamp current and lamp voltage at the output of lamp driver 110. The power control is superimposed on the lamp current control described above for the purpose of keeping the average lamp power constant.
  • the lamp driver 110 In order to counteract a drop in the brightness of the HID lamp 322 suddenly registered by the brightness sensor 130, the lamp driver 110 first increases the lamp current as part of the brightness control so that the brightness initially remains constant. This increase in lamp current leads to an increase in electrical power provided for the lamp 322 at the output of the lamp driver 110 and is recognized by the power control.
  • the power delivered to the HID lamp 322 may briefly exceed its nominal power, but not for a long time. If the increased lamp current is not returned by the brightness control within a certain time, e.g.
  • the power control intervenes and reduces the lamp current, although the lamp then only emits a reduced brightness , In this way, the higher-level power control ensures that the lamp is not operated above its nominal power level in the long term.
  • the reduction in lamp current caused by the power control and the resulting reduction in the brightness of the lamp light is advantageously not perceived by a human viewer because it takes place particularly slowly. The insensitivity of the human eye to slow changes in brightness is exploited.
  • control signal of the flicker control also disappears after some time due to the high-pass characteristic, so that the lamp power returns to the initial value, even if the power control is not effective.
  • the circuit according to the invention ensures that the lamp is always operated at nominal power level on average throughout its entire service life. This has the advantage that the lamp has a maximum service life and that the luminous efficacy of the lamp is always optimal from the start of its life.
  • FIGS. 1, 3 and 2 shows an image projector with HID lamps as a preferred application example for the electronic circuit according to the invention.
  • the image projector essentially comprises the electronic circuit acc. Fig. 1 and the optical system as described above with reference to Fig. 3. Components with the same reference numerals in FIGS. 1, 3 and 2 are to be regarded as identical or with the same effect.
  • the image generator 424 is installed between two lens systems 425a, 425b and the brightness sensor 130 in the vicinity of the image generator 424 or arranged in such a way that it detects the amount of light incident on the image generator.
  • the electronic circuit in the projector therefore ensures that the image generator 424 is illuminated only with light of medium-term constant brightness and that the image projected onto a screen 426 by the image generator 424 is therefore not subject to any brightness fluctuations visible to the human eye.

Landscapes

  • Projection Apparatus (AREA)
  • Circuit Arrangement For Electric Light Sources In General (AREA)
  • Circuit Arrangements For Discharge Lamps (AREA)
EP02016738A 2001-07-27 2002-07-26 Circuit électronique pour lampe à forte décharge et dispositif de projection d' images Expired - Fee Related EP1280387B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE10136474A DE10136474A1 (de) 2001-07-27 2001-07-27 Elektronischer Schaltkreis zum Betreiben einer HID-Lampe und Bildprojektor
DE10136474 2001-07-27

Publications (3)

Publication Number Publication Date
EP1280387A2 true EP1280387A2 (fr) 2003-01-29
EP1280387A3 EP1280387A3 (fr) 2004-04-28
EP1280387B1 EP1280387B1 (fr) 2006-09-27

Family

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Family Applications (1)

Application Number Title Priority Date Filing Date
EP02016738A Expired - Fee Related EP1280387B1 (fr) 2001-07-27 2002-07-26 Circuit électronique pour lampe à forte décharge et dispositif de projection d' images

Country Status (7)

Country Link
US (1) US6779896B2 (fr)
EP (1) EP1280387B1 (fr)
JP (1) JP4198408B2 (fr)
KR (1) KR100906624B1 (fr)
CN (1) CN100339760C (fr)
DE (2) DE10136474A1 (fr)
TW (1) TW552828B (fr)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2003056817A1 (fr) * 2002-01-02 2003-07-10 Philips Intellectual Property & Standards Gmbh Appareil de projection et procede d'exploitation dudit appareil
WO2004010710A2 (fr) * 2002-07-18 2004-01-29 Philips Intellectual Property & Standards Gmbh Systeme de projection
EP1554891A1 (fr) * 2002-10-17 2005-07-20 Philips Intellectual Property & Standards GmbH Projecteur d'images a regulation d'intensite de la source de lumiere

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DE10244821A1 (de) * 2002-09-26 2004-04-01 Philips Intellectual Property & Standards Gmbh Projektionssystem
EP1570682B1 (fr) * 2002-12-04 2007-11-07 Barco Control Rooms GmbH Regulation de la luminosite et des couleurs d'un appareil de projection
US20060145064A1 (en) * 2003-06-16 2006-07-06 Peter Lurkens Projection system
US20040267621A1 (en) * 2003-06-27 2004-12-30 Schuller Robert J. Food product scale-based incentive system
US7055962B2 (en) * 2003-11-21 2006-06-06 Dell Products L.P. System and method for managing projector bulb life
JP2007531919A (ja) * 2004-03-16 2007-11-08 サイン−トロニツク・アクチエンゲゼルシヤフト ほぼ一定の光度を有する光ビームを発生する方法
KR20050101815A (ko) * 2004-04-20 2005-10-25 엘지.필립스 엘시디 주식회사 액정표시장치용 램프 구동회로 및 구동방법
US7245224B2 (en) * 2004-08-13 2007-07-17 Dell Products Lp Methods and systems for diagnosing projection device failure
US20060187417A1 (en) * 2005-02-21 2006-08-24 Seiko Epson Corporation Projector
JP4281729B2 (ja) * 2005-02-28 2009-06-17 セイコーエプソン株式会社 プロジェクタ
EP1727401B1 (fr) * 2005-05-25 2008-12-31 Barco N.V. Contrôle d'une lampe de projecteur avec durée de vie de la lampe allongée
EP1727402A1 (fr) * 2005-05-25 2006-11-29 Barco NV Contrôle d'une lampe de projecteur avec durée de vie de la lampe allongée
JP4462119B2 (ja) * 2005-06-10 2010-05-12 セイコーエプソン株式会社 バラスト及びプロジェクタ
WO2007019486A2 (fr) * 2005-08-08 2007-02-15 Moving Image Technologies Llc Module de projecteur de cinema numerique et modernisation de ce dernier avec une installation en rattrapage
WO2007040479A1 (fr) * 2005-09-21 2007-04-12 Tte Technology, Inc. Systeme et procede d'augmentation de la luminosite d'une image
CA2626575C (fr) * 2005-10-17 2015-01-06 Acuity Brands, Inc. Systeme de commande de sortie de flux lumineux constant
EP1969579B1 (fr) * 2005-12-06 2013-11-06 Dolby Laboratories Licensing Corporation Afficheurs electroniques modulaires
US20080048578A1 (en) * 2006-08-26 2008-02-28 Matthew Beasley Projector HID lamp ballast having auxiliary resonant circuit
US20080048577A1 (en) * 2006-08-26 2008-02-28 Matthew Beasley Projector HID lam ballast having LLC resonant converter
JP5136824B2 (ja) * 2007-03-09 2013-02-06 ソニー株式会社 プロジェクタおよびその制御方法
US8016433B2 (en) * 2007-03-09 2011-09-13 Sony Corporation Projector and control method thereof
JP2008224870A (ja) * 2007-03-09 2008-09-25 Sony Corp プロジェクタおよびその制御方法
JP5126569B2 (ja) * 2007-03-09 2013-01-23 ソニー株式会社 プロジェクタおよびその制御方法
JP4433320B2 (ja) * 2007-03-09 2010-03-17 ソニー株式会社 プロジェクタおよびその制御方法
JP5109527B2 (ja) * 2007-08-03 2012-12-26 ソニー株式会社 画像形成装置およびその制御方法、並びにプログラム
CN102023462B (zh) * 2009-09-14 2012-06-06 联想(北京)有限公司 一种微型投影机、其调节亮度的方法及一种便携式设备
US10384078B2 (en) * 2013-10-15 2019-08-20 Ip Liberty Vision Corporation Polymeric radiation-sources
CN105223763B (zh) * 2015-11-04 2017-03-15 雷欧尼斯（北京）信息技术有限公司 用于光回收3d放映系统中的亮度自动均衡装置及方法
USD892304S1 (en) 2019-01-04 2020-08-04 Sleepnet Corporation Facemask pressure adjustment device

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Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2003056817A1 (fr) * 2002-01-02 2003-07-10 Philips Intellectual Property & Standards Gmbh Appareil de projection et procede d'exploitation dudit appareil
WO2004010710A2 (fr) * 2002-07-18 2004-01-29 Philips Intellectual Property & Standards Gmbh Systeme de projection
WO2004010710A3 (fr) * 2002-07-18 2004-06-03 Philips Intellectual Property Systeme de projection
US7425932B2 (en) 2002-07-18 2008-09-16 Koninklijke Philips Electronics, N.V. Projection system featuring light source luminuous flux sensing and compensation
EP1554891A1 (fr) * 2002-10-17 2005-07-20 Philips Intellectual Property & Standards GmbH Projecteur d'images a regulation d'intensite de la source de lumiere

Also Published As

Publication number Publication date
DE10136474A1 (de) 2003-02-13
DE50208237D1 (de) 2006-11-09
JP4198408B2 (ja) 2008-12-17
CN100339760C (zh) 2007-09-26
KR20030011622A (ko) 2003-02-11
JP2003123991A (ja) 2003-04-25
US20030020412A1 (en) 2003-01-30
CN1407843A (zh) 2003-04-02
TW552828B (en) 2003-09-11
EP1280387B1 (fr) 2006-09-27
US6779896B2 (en) 2004-08-24
EP1280387A3 (fr) 2004-04-28
KR100906624B1 (ko) 2009-07-09

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