EP1280387B1 - 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
EP1280387B1
EP1280387B1 EP02016738A EP02016738A EP1280387B1 EP 1280387 B1 EP1280387 B1 EP 1280387B1 EP 02016738 A EP02016738 A EP 02016738A EP 02016738 A EP02016738 A EP 02016738A EP 1280387 B1 EP1280387 B1 EP 1280387B1
Authority
EP
European Patent Office
Prior art keywords
lamp
electronic circuit
hid
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.)
Expired - Fee Related
Application number
EP02016738A
Other languages
German (de)
English (en)
Other versions
EP1280387A3 (fr
EP1280387A2 (fr
Inventor
Peter Dr. Philips Corporate IP GmbH Lürkens
Carsten Philips Corporate IP GmbH Deppe
Holger Dr. Philips Corporate IP 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
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, 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 basically known in the art. They are preferably used for projection purposes, but also e.g. used for the operation of car headlights. They are characterized by a very small arc and a high light output at the same time, 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 a disadvantage of bow jump, i. a change in the position of the arc during the operation of these lamps.
  • bow jump i. a change in the position of the arc during the operation of these lamps.
  • the proportion of light generated by the lamp as a whole, which is incident on the image forming system varies, so that the brightness of the projected image fluctuates.
  • This effect also leads to undesirable fluctuations in the brightness distribution on the image generator. The result is a perceivable by the viewer Flicker effect.
  • a first approach provides for an additional high current pulse in the course of the lamp current prior to its commutation. Due to this special shape of the lamp current, the arc jumping 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 in the case of 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 having an optical system 420 and an electrical circuit.
  • the optical system 420 comprises a gas discharge lamp 422 with a reflector 421 and the lamp downstream of an integrator 423, an image generator 424 and a lens 425b.
  • the integrator 423 together with a condenser 425a, ensures a uniform brightness distribution upon illumination of the imager 424 and thus in the image produced by the imager.
  • the electrical circuit is for operating the lamp 422. It includes a lamp driver 410 for providing a regulated lamp current to 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 amount of light represented by the sensor signal is compared in a microprocessor 440 with a predetermined reference light amount, and then in response to the measured light quantity deviation to generate the control signal and output to the lamp driver. In this way, the emitted light quantity is adjusted to the reference value. A flicker effect can be prevented if the light quantity control is fast enough.
  • HID lamps are also characterized by a delicate thermal equilibrium that is only well maintained at rated power. In the case of deviations, disadvantages in terms of service life are to be expected, so that the control according to the type of JP-2000028988 A can be expected to shorten the service life.
  • the brightness sensor should work reliably in the known circuit not only at room temperature but also at high temperatures inside an image projector.
  • an electronic circuit for operating a HID lamp and an image projector with such an electronic circuit to develop so that a regulation of the brightness over the entire life of the lamp and a use of simpler constructed and thus cheaper sensors is possible.
  • the remaining alternating components of the brightness fluctuations are regulated according to the invention to zero, instead - as in the prior art - to control the absolute brightness to a predetermined reference value.
  • the high-pass filter advantageously enables a compensation of the brightness fluctuations by the circuit during the entire life of the HID lamp.
  • the compensation is possible according to the invention in particular in nominal power operation in both the positive and in the negative direction.
  • the flicker effect is effectively suppressed for the human eye.
  • a control unit within the lamp driver is further configured to regulate the electrical power generated at the output of the control unit so that the HID lamp is operated in the long term constant at nominal power level. This maximizes the life of the lamp and ensures that the luminous efficacy of the lamp is maximized throughout its lifetime.
  • the object of the invention is further achieved by the subject matter of claim 7.
  • the advantages of the image projector claimed there correspond essentially to the advantages mentioned above with regard to the electronic circuit.
  • the human eye is sensitive to flicker effects. Therefore, the suppression of this effect is particularly advantageous here.
  • Fig. 1 shows an electronic circuit for operating a 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 regulate 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 over 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 DC component is filtered out of the sensor signal and thus also from the control signal.
  • the high-pass-filtered control signal according to the invention represents only the alternating component in the original sensor signal, ie only the actual brightness fluctuations.
  • the brightness variations 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 goal of the control by the lamp driver 110 is the generation of a stabilized brightness without rapid fluctuations, in particular at the location of the brightness sensor 130. This is achieved in that the designed as a control unit lamp driver 110 strives to keep the control signal to zero or to zero committeeregeln.
  • the lamp driver 110 according to the invention is always capable of making a positive or negative correction / regulation of the brightness, if this should be necessary in order to keep the brightness substantially constant.
  • the filter 140 may also be designed as a bandpass filter, ie as a combined high and low pass filter. It then preferably has a lower limit frequency of less than 1 Hz and an upper limit frequency of more than 100 Hz, depending on the lamp type and projection system.
  • the upper limit frequency is advantageously above the perceivable for the human eye brightness fluctuation frequency.
  • the bandpass filter in addition to a capping of the DC component advantageously additionally causes a restriction in the upper frequency range. This simplifies the design requirements of the lamp driver 110 in that the stability can be achieved much more easily with a high quality than with a high-pass filtered control signal.
  • the transfer function of the filter 110 may further be designed so that the filter in addition to the low-pass or high-pass filtering also allows 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 to a constant power level. This is usually done by monitoring the product of lamp current and lamp voltage at the output of the lamp driver 110. The power control is superimposed on the lamp current control described above in order to keep 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 causes an increase in the lamp current in the context of the brightness control so that the brightness first remains constant. This increase in the lamp current leads to an increase in the provided at the output of the lamp driver 110 electrical power to the lamp 322 and is detected by the power control. For a short time, the power output to the HID lamp 322 may well exceed its rated power, but not for a long time.
  • the power control intervenes and drives the lamp current, although the lamp then only emits a reduced brightness , In this way, the superimposed power control ensures that the lamp is not operated in the long term above its rated power level.
  • the reduction of the 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 observer because it is particularly slow. The insensitivity of the human eye to slow brightness changes is exploited.
  • control signal of the flicker control also disappears after some time, so that the lamp power returns to the initial value even if the power control does not take effect.
  • the circuit according to the invention ensures that the lamp is, on average, always operated at nominal power level during its entire service life. This has the advantage that the life of the lamp is maximum and that the light output of the lamp from the beginning of their life is always optimal.
  • Fig. 2 shows an image projector with HID lamps as a preferred application example of the electronic circuit according to the invention.
  • the image projector essentially comprises the electronic circuit gem.
  • Components with the same reference numbers in FIGS. 1, 3 and 2 are to be regarded as identical or having 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 in this itself arranged so that it detects the incident on the imager amount of light.
  • the electronic circuit in the projector therefore ensures that the imager 424 is illuminated only with light of medium brightness over the medium term, and that therefore the image projected onto a screen 426 by the imager 424 is not subject to 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)

Claims (7)

  1. Circuit électronique pour le fonctionnement d'une lampe HID (High-Intensity-Discharge ou à décharge à haute intensité) (422), en particulier une lampe UHP (Ultra-High-Pressure ou ultra-haute pression) comprenant:
    - un circuit d'attaque de lampe (110) pour la fourniture d'un courant de lampe réglé pour le fonctionnement de la lampe HID (422) en réaction à un signal de commande ; et
    - un capteur de luminance (130) pour la production et la délivrance d'un signal de capteur, le signal de capteur représentant la quantité de lumière délivrée par la lampe HID (422) à l'endroit du capteur de luminance (130) ;
    caractérisé par un filtre (140) qui est conçu comme un filtre passe-haut pour fournir le signal de commande par le filtrage passe-haut du signal de capteur.
  2. Circuit électronique selon la revendication 1,
    caractérisé en ce
    que la fréquence-limite du filtre passe-haut est inférieure à 1 Hz.
  3. Circuit électronique selon la revendication 1,
    caractérisé en ce
    que le filtre (140) est conçu comme un filtre passe-bande.
  4. Circuit électronique selon la revendication 3,
    caractérisé en ce
    que la fréquence-limite inférieure du filtre passe-bande se situe à moins de 1 Hz et sa fréquence-limite supérieure à plus de 100 Hz.
  5. Circuit électronique selon la revendication 1,
    caractérisé en ce
    que le circuit d'attaque de lampe (110) est conçu comme une unité de réglage pour la fourniture et le réglage du courant de la lampe en réaction au signal de commande de telle sorte que la quantité de lumière délivrée par la lampe HID (422) à l'endroit du capteur de luminance soit constante à moyen terme.
  6. Circuit électronique selon la revendication 5,
    caractérisé en ce
    que le circuit d'attaque de la lampe (110) est par ailleurs conçu pour régler la puissance électrique produite à la sortie de l'unité de réglage de telle sorte que la lampe HID (422) fonctionne constamment au niveau de la puissance nominale à long terme.
  7. Projecteur d'image avec une lampe à décharge à haute intensité (HID), en particulier avec une lampe à ultra-haute pression (UHP) comprenant:
    un système optique (420) contenant la lampe HID (422) ainsi que la lampe HID;
    monté en aval, un générateur d'images (424) pour la production d'une image; et
    le circuit électronique selon la revendication 1,
    le capteur de luminance (130) étant positionné dans le système optique (420) de telle sorte que le signal du capteur représente la quantité de lumière produite par la lampe HID et incidente sur le générateur d'image (424).
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
DE10136474 2001-07-27
DE10136474A DE10136474A1 (de) 2001-07-27 2001-07-27 Elektronischer Schaltkreis zum Betreiben einer HID-Lampe und Bildprojektor

Publications (3)

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

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US7425932B2 (en) 2002-07-18 2008-09-16 Koninklijke Philips Electronics, N.V. Projection system featuring light source luminuous flux sensing and compensation

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Also Published As

Publication number Publication date
KR20030011622A (ko) 2003-02-11
JP2003123991A (ja) 2003-04-25
KR100906624B1 (ko) 2009-07-09
CN1407843A (zh) 2003-04-02
US6779896B2 (en) 2004-08-24
US20030020412A1 (en) 2003-01-30
CN100339760C (zh) 2007-09-26
EP1280387A3 (fr) 2004-04-28
DE50208237D1 (de) 2006-11-09
EP1280387A2 (fr) 2003-01-29
JP4198408B2 (ja) 2008-12-17
DE10136474A1 (de) 2003-02-13
TW552828B (en) 2003-09-11

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