WO2004054328A1 - Lighting unit - Google Patents
Lighting unit Download PDFInfo
- Publication number
- WO2004054328A1 WO2004054328A1 PCT/IB2003/005610 IB0305610W WO2004054328A1 WO 2004054328 A1 WO2004054328 A1 WO 2004054328A1 IB 0305610 W IB0305610 W IB 0305610W WO 2004054328 A1 WO2004054328 A1 WO 2004054328A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- lamp
- cooling device
- lighting unit
- power
- discharge
- Prior art date
Links
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
- H05B41/36—Controlling
-
- 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
- H05B41/26—Circuit arrangements in which the lamp is fed by power derived from dc by means of a converter, e.g. by high-voltage dc
- H05B41/28—Circuit arrangements in which the lamp is fed by power derived from dc by means of a converter, e.g. by high-voltage dc using static converters
- H05B41/288—Circuit arrangements in which the lamp is fed by power derived from dc by means of a converter, e.g. by high-voltage dc using static converters with semiconductor devices and specially adapted for lamps without preheating electrodes, e.g. for high-intensity discharge lamps, high-pressure mercury or sodium lamps or low-pressure sodium lamps
- H05B41/292—Arrangements for protecting lamps or circuits against abnormal operating conditions
- H05B41/2928—Arrangements for protecting lamps or circuits against abnormal operating conditions for protecting the lamp against abnormal operating conditions
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B20/00—Energy efficient lighting technologies, e.g. halogen lamps or gas discharge lamps
Definitions
- the invention relates to a lighting unit having a discharge lamp, in particular a high pressure or high intensity discharge (HID) lamp or an ultra high performance (UHP) lamp, a lamp driver and a cooling device.
- the invention also relates to a projection system having such a lighting unit. Because of their optical properties, high intensity discharge lamps and in particular UHP lamps are used inter alia preferably for projection purposes with displays or in projection systems. It has been demonstrated that the service life of discharge lamps is determined substantially by the operating parameters, such as in particular the lamp current, the lamp power and the temperature and temperature differences in the lamp and in particular in the wall of the discharge vessel.
- thermal loading of the lamp which may vary considerably depending on its installation situation, surrounding environment and size.
- thermal loading of the lamp which may vary considerably depending on its installation situation, surrounding environment and size.
- a suitable lamp design in particular appropriate lamp geometry.
- an active cooling device is generally necessary.
- An appropriate lamp geometry and an active cooling device for an electrodeless discharge lamp are known, for example, from US-PS 6,016,031.
- the cooling device comprises an air pressure source and one or more nozzles, with which an air stream is directed onto the top of the lamp or evenly onto all sides.
- the air pressure is rated and the shapes and dimensions of the cross-sections of the nozzles are selected in such a way that the surface temperature of the lamp does not exceed a given value, which would lead to a reduction in service life.
- the heat-generating plasma breaks down and thus also the thermal convection current in the discharge vessel.
- the consequences of this are that the temperature distribution in the wall of the discharge vessel changes and the wall areas cool off to differing extents and at different rates in accordance with their varying temperatures in the operating state. In this way, considerable mechanical stresses may arise in the wall of the discharge vessel, which may lead to immediate destruction of the lamp or at least to a reduction in the service life of the lamp. This problem may also occur in like manner when the lamp is switched on.
- a further object of the invention is to provide a lighting unit of the above- mentioned type, which eliminates at least to a considerable extent the effect associated with switching the lamp on and off of reducing the service life or destroying the lamp.
- the lamp may be so operated that the mechanical stresses in the light bulb and in particular in the discharge vessel caused by temperature fluctuations are substantially less during all operating phases or at least do not reach a level at which they reduce the service life in comparison to known lighting units.
- a lamp driver in particular for use in a lighting unit of the above-mentioned type or in a projection system having such a lighting unit, with which lamp driver a discharge lamp and/or a cooling device may be operated in such a way, especially during switching on/off, that the service life of the lamp is extended in comparison to known lamp drivers or the lamp may be operated with increased power for the same service life.
- the object as claimed in claim 1 is achieved with a lighting unit having a discharge lamp, a lamp driver, a cooling device, at least one device for detecting at least one predetermined operating parameter of the discharge lamp, together with a control unit for controlling the lamp driver and/or the cooling device at least during switching on and/or off of the lighting unit in such a way that there is no excursion from a predetermined range of the at least one operating parameter.
- Operating parameters should be understood, in this context, to mean not only the lamp power or the lamp current, but also the temperature of the lamp and in particular the temperatures in the wall of the discharge vessel of the lamp.
- these temperatures are largely dependent on the power of an active cooling device acting on the lamp and in particular on an air or gas stream directed onto the lamp, such that, on the basis of this direct influence, the cooling power of the cooling device should also be one of the operating parameters of the lamp.
- the type and range of one or more of these operating parameters are selected as a function of the detectability thereof and of the type of lamp used as well as with regard to whether primarily the service life of the lamp is to be extended or the lamp is to be operated with the same service life at increased power.
- control unit as claimed in claim 9
- lamp driver as claimed in claim 10
- projection system as claimed in claim 11.
- a substantial advantage of these solutions is that high mechanical stresses in the wall of the discharge vessel, which have a service life-reducing effect, may be prevented therewith during switching on and off of the lamp.
- Claims 2 and 3 contain operating parameters of the lamp which are preferably to be detected, while claim 4 covers rating of a range for an operating parameter.
- Claim 6 describes a type of control which is particularly preferred in routine lamp operation, with which excursions from the predetermined range of an operating parameter of the lamp, in particular the temperature thereof, are prevented.
- Claims 7 and 8 relate to preferred methods of control during switching on and off the lamp.
- claim 10 describes a lamp driver, to which a discharge lamp and a cooling device may be connected for control in the above-described manner and which is particularly suitable for control during switching on/off.
- Fig. 1 is a schematic overall representation of a lighting unit according to the invention.
- Fig. 2 is a schematic block diagram of a lamp driver with a control unit.
- the lighting unit comprises a discharge lamp 1 with a discharge vessel 11, in which there are located a discharge chamber with a discharge gas and two electrodes, between whose tips an arc discharge is induced when the lamp is in the operating state.
- the discharge vessel 11 in each case comprises a metal- quartz bushing 12, 13 with in each case one metallic conductor connected to the electrodes as well as an electrical terminal via which the lamp voltage is supplied in known manner.
- the electrical terminals of the discharge lamp 1 are connected to the electrical output terminals of a lamp driver 2.
- the input voltage generally takes the form of a line voltage (not illustrated) applied to the lamp driver 2.
- the lamp driver 2 thus serves to transform the line voltage into a lamp voltage suitable for operating the discharge lamp and makes available the current necessary therefor, when the lamp is switched on, for example by means of a switch (not shown) on the lamp driver 2.
- discharge lamps in particular high power discharge lamps, have to be actively cooled during operation.
- This task is performed by a cooling device 3, which generally contains a gas, in particular an air, pressure source and which directs a gas or air stream onto the lamp 1, in particular the discharge vessel 11, via a pressure line 31 with a nozzle 32.
- a first sensor 33 is provided which is connected to the lamp driver 2 for evaluation of the sensor signal.
- a further sensor may also be arranged in the pressure line 31, with which sensor, for example, the volume or pressure of the gas stream conveyed to the lamp 1 is detected and transmitted to the lamp driver 2. Evaluation of one of these variables allows not only monitoring of the cooling device 3, for example with regard to a fault or a failure, but also specific control of the cooling power acting on the lamp 1, in order in this way to influence the temperature thereof and to keep it within a predetermined range.
- this first sensor 33 by evaluating the sensor signal, may also allow a conclusion to be drawn with regard to the lamp temperature, since this is dependent on the cooling power acting thereon, for example in the form of the volume of the cooling air stream directed onto the lamp per unit time.
- a second sensor 34 may be arranged on the discharge vessel 11 of the lamp 1, which sensor 34 detects the lamp temperature and in particular the temperature in the wall of the discharge vessel 11. This second sensor 34 is also connected to the lamp driver 2 for evaluation of the sensor signal.
- a second sensor 34 directly on the lamp 1 is not generally necessary since, as explained above, the temperature thereof may be determined or detected sufficiently precisely by means of the power of the cooling device. To this extent, use of the second sensor 34 is generally only necessary as an alternative to the first sensor 33.
- the lamp driver 2 substantially comprises a first unit 21, with which input terminals 20 are connected for supplying an alternating line voltage.
- the first unit 21 comprises, for example, a rectifier with downstream down converter and serves to generate a controlled direct voltage from the alternating line voltage.
- the output of the first unit 21 is connected to a second unit 22, which comprises a commutator (for example in the form of a full bridge circuit) and with which the current waveform necessary for lamp operation is generated from the direct voltage supplied.
- the output of the second unit 22 is connected to the lamp 1.
- the first and second units 21, 22 together thus form a trigger circuit for the lamp 1.
- the lamp driver 2 further comprises a control unit 23, to the first input of which the output signal of the first sensor 33 is applied.
- the control unit 23 comprises a second input, which is connected to the trigger circuit 21, 22 and via which the control unit 23 detects the lamp current and/or the lamp voltage and/or the lamp power.
- a first output of the control unit 23 is connected to the trigger circuit 21, 22, a second output of the control unit 23 is applied to the cooling device 3 for activation thereof.
- the control unit 23 preferably takes the form of a microprocessor unit. As a function of the information supplied via the two inputs about the operating parameters of the lamp 1 (power of the cooling device 3 and lamp current and/or lamp voltage and/or lamp power) and as a function of the switch position of the on/off switch for the lamp 1, the output power of the lamp 1 (or the lamp current) and or the power of the cooling device 3 may be controlled in accordance with various control or switching schedules.
- the lamp 1 is always cooled sufficiently during routine operation, for example by controlling the cooling power of the cooling device 3 as a function of the lamp temperature detected indirectly with the first sensor 33 or directly with the second sensor 34.
- the lamp current may be automatically reduced or switched off by means of the lamp driver 2 to prevent damage or destruction.
- the lamp 1 and/or the cooling device 3 it is possible, even during switching on and/or off, for the lamp 1 and/or the cooling device 3 to be switched on or off and operated automatically, for example stepwise, in coordinated manner in such a way that the above-described mechanical stresses in the lamp 1 and in particular in the discharge vessel 11 are substantially less or do not exceed a predeterminable value.
- the following operating parameters of the lamp 1 should be evaluated cyclically by the control unit 23 of the lamp driver 2:
- the instantaneous temperature of the lamp 1 or the wall of the discharge vessel 11 is detected by evaluating the output signal of the second sensor 34.
- the cooling power to which the lamp 1 is exposed by the cooling device 2, and thus, as explained above, indirectly (also) the temperature of the lamp 1, may be detected by means of the first sensor 33 and or the pressure sensor present in the pressure line 31.
- the lamp current and/or the lamp voltage and/or the lamp power are scanned by appropriate sensor means in the control unit 23.
- Various switching schedules may be produced with these variables during switching on and off:
- a first switching schedule both the lamp 1 and the cooling device 3 are switched on and/or off directly by actuation of the on/off switch. This may be sensible if, for example, the lamp 1 is so dimensioned that the mechanical stresses arising are low and no damage to the lamp is to be feared, or if it is important that the cooling device 3 does not make any noise after the lamp 1 has been switched off.
- the lamp 1 is again switched off directly by actuation of the off switch, but the cooling device 3 remains active for a predetermined period of time. In this way, the lamp 1 is cooled down particularly quickly and may be switched on again after only a relatively short interval.
- the cooling device 3 is switched off directly by actuation of the off switch, while the lamp 1 remains active for a predetermined period of time. This ensures that mechanical stresses which have built up in the lamp 1 and in particular in the wall of the discharge vessel 11 during operating phases at reduced operating temperature are reduced by annealing at elevated temperature.
- the lamp 1 and the cooling device 3 are reduced in power alternately and/or stepwise when the off switch is actuated. This may be achieved, for example, in that the power of the cooling device 3 is adjusted as a function of the current supplied instantaneously to the lamp 1 (or the lamp power) and/or the lamp current (or the lamp power) is adjusted as a function of the instantaneous power of the cooling device 3.
- the lamp power and the power of the cooling device 3 are also reduced stepwise in such a way that the lamp 1 is operated ultimately at reduced power without the cooling device 3, in order thereby to eliminate mechanical stresses in the lamp in accordance with the third switching schedule by annealing at elevated temperature.
- actuation of the off switch effects immediate switching off of the lamp 1 and an increase in cooling power for a predetermined period of time after switching off of the lamp 1.
- the particularly rapid cooling effected thereby makes it possible to switch the lamp back on after a short period, as with the second switching schedule.
- mechanical stresses in the lamp 1 or in the wall of the discharge vessel 11 may be generated in a controlled manner, for example in order thereby to counter or compensate for mechanical stresses arising due to the uneven heating when the lamp is switched on. In such a case, overall only substantially lower mechanical stresses arise when the lamp is next switched on. Comparative tests using the above-mentioned switching schedules have demonstrated that very different mechanical stress distributions may thereby be produced in the wall of the discharge vessel 11.
- the numerical values of the above-mentioned switching schedules should be selected as a function of the operating parameters of the lamp 1 used and the power of the cooling device 3 together, for example, with the required explosion protection and service life of the lamp 1, the time available for switching on and off and the noise level tolerable with regard to use of the lighting unit.
- This Table is preferably stored in the control unit 23, in particular the microprocessor unit, present in the lamp driver 2, such that the control unit 23 regulates the power of the lamp 1 and the cooling device 3 in the manner described.
Abstract
Description
Claims
Priority Applications (6)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2004558941A JP4572117B2 (en) | 2002-12-11 | 2003-12-04 | Lighting unit |
DE60321599T DE60321599D1 (en) | 2002-12-11 | 2003-12-04 | LIGHTING UNIT |
EP03812628A EP1574115B1 (en) | 2002-12-11 | 2003-12-04 | Lighting unit |
AU2003302860A AU2003302860A1 (en) | 2002-12-11 | 2003-12-04 | Lighting unit |
US10/538,104 US7654696B2 (en) | 2002-12-11 | 2003-12-04 | Lighting unit |
CN2003801056396A CN1723742B (en) | 2002-12-11 | 2003-12-04 | Lighting unit |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP02102727.1 | 2002-12-11 | ||
EP02102727 | 2002-12-11 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2004054328A1 true WO2004054328A1 (en) | 2004-06-24 |
Family
ID=32479802
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/IB2003/005610 WO2004054328A1 (en) | 2002-12-11 | 2003-12-04 | Lighting unit |
Country Status (8)
Country | Link |
---|---|
US (1) | US7654696B2 (en) |
EP (1) | EP1574115B1 (en) |
JP (1) | JP4572117B2 (en) |
CN (1) | CN1723742B (en) |
AT (1) | ATE398388T1 (en) |
AU (1) | AU2003302860A1 (en) |
DE (1) | DE60321599D1 (en) |
WO (1) | WO2004054328A1 (en) |
Cited By (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2006105075A2 (en) * | 2005-03-29 | 2006-10-05 | Hewlett-Packard Development Company, L.P. | Light source module |
WO2007049358A1 (en) | 2005-10-25 | 2007-05-03 | Matsushita Electric Works, Ltd. | Method and apparatus for operating very high pressure short arc discharge lamps |
WO2008020366A3 (en) * | 2006-08-15 | 2008-05-02 | Philips Intellectual Property | Method of driving a discharge lamp, driving arrangement, an projector system |
WO2008083697A1 (en) * | 2006-12-20 | 2008-07-17 | Patent-Treuhand-Gesellschaft für elektrische Glühlampen mbH | Performance-dependant fan control for enlarging the dimming region of hid lamps |
WO2009092449A1 (en) * | 2008-01-24 | 2009-07-30 | Osram Gesellschaft mit beschränkter Haftung | Method and operating device for operating a high-pressure discharge lamp |
WO2009100755A1 (en) * | 2008-02-11 | 2009-08-20 | Osram Gesellschaft mit beschränkter Haftung | Method for operating a high-pressure discharge lamp |
US9395610B2 (en) | 2013-06-20 | 2016-07-19 | Seiko Epson Corporation | Light source, projector, and method of cooling discharge lamp |
Families Citing this family (11)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20090224675A1 (en) * | 2004-04-21 | 2009-09-10 | Pavel Pekarski | Lighting unit |
EP1875782B1 (en) * | 2005-04-18 | 2010-10-20 | Freescale Semiconductor Inc. | Current driver circuit and method of operation therefor |
US7294979B2 (en) * | 2005-05-27 | 2007-11-13 | Hewlett-Packard Development Company, L.P. | Light source module with temperature sensor |
TW200734796A (en) * | 2006-03-13 | 2007-09-16 | Benq Corp | Projection device capable of determining if a light source has been cooled down while turning on the projection device and method for controlling a power on procedure of the projection device |
US20100014839A1 (en) * | 2006-09-14 | 2010-01-21 | Koninklijke Philips Electronics N.V. | Lighting assembly and method for providing cooling of a light source |
JP2010272440A (en) * | 2009-05-25 | 2010-12-02 | Stanley Electric Co Ltd | Cooling type led lighting device |
DE102012109519B4 (en) * | 2012-10-08 | 2017-12-28 | Heraeus Noblelight Gmbh | Method for operating a lamp unit for generating ultraviolet radiation and suitable lamp unit therefor |
JP6151591B2 (en) * | 2013-02-22 | 2017-06-21 | 株式会社小糸製作所 | Vehicle lighting |
JP6366235B2 (en) * | 2013-07-26 | 2018-08-01 | キヤノン株式会社 | Projection-type image display device |
JP6544322B2 (en) * | 2016-09-05 | 2019-07-17 | 株式会社デンソー | Vehicle lamp controller |
CN110617463A (en) * | 2019-09-27 | 2019-12-27 | 广州飞达音响股份有限公司 | Heat dissipation system and heat dissipation method for prolonging service life of stage discharge lamp |
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US5705897A (en) * | 1994-07-12 | 1998-01-06 | Mitsubishi Denki Kabushiki Kaisha | Apparatus for lighting alternating current discharge lamp |
US5909085A (en) * | 1997-03-17 | 1999-06-01 | Korry Electronics Co. | Hybrid luminosity control system for a fluorescent lamp |
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2003
- 2003-12-04 EP EP03812628A patent/EP1574115B1/en not_active Expired - Lifetime
- 2003-12-04 JP JP2004558941A patent/JP4572117B2/en not_active Expired - Fee Related
- 2003-12-04 US US10/538,104 patent/US7654696B2/en not_active Expired - Fee Related
- 2003-12-04 WO PCT/IB2003/005610 patent/WO2004054328A1/en active IP Right Grant
- 2003-12-04 AT AT03812628T patent/ATE398388T1/en not_active IP Right Cessation
- 2003-12-04 CN CN2003801056396A patent/CN1723742B/en not_active Expired - Fee Related
- 2003-12-04 DE DE60321599T patent/DE60321599D1/en not_active Expired - Lifetime
- 2003-12-04 AU AU2003302860A patent/AU2003302860A1/en not_active Abandoned
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DE3019669A1 (en) * | 1979-06-13 | 1980-12-18 | Bell & Howell Co | PROJECTION LAMP CONTROL DEVICE |
US4533853A (en) * | 1983-03-25 | 1985-08-06 | Xerox Corporation | Mechanism and method for controlling the temperature and output of a fluorescent lamp |
US4672271A (en) * | 1985-04-15 | 1987-06-09 | Omniprise, Inc. | Apparatus and method for automatic operation of a high pressure mercury arc lamp |
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Cited By (11)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2006105075A2 (en) * | 2005-03-29 | 2006-10-05 | Hewlett-Packard Development Company, L.P. | Light source module |
WO2006105075A3 (en) * | 2005-03-29 | 2007-01-04 | Hewlett Packard Development Co | Light source module |
GB2438150A (en) * | 2005-03-29 | 2007-11-14 | Hewlett Packard Development Co | Light source module |
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WO2007049358A1 (en) | 2005-10-25 | 2007-05-03 | Matsushita Electric Works, Ltd. | Method and apparatus for operating very high pressure short arc discharge lamps |
WO2008020366A3 (en) * | 2006-08-15 | 2008-05-02 | Philips Intellectual Property | Method of driving a discharge lamp, driving arrangement, an projector system |
US8106592B2 (en) | 2006-08-15 | 2012-01-31 | Koninklijke Philips Electronics N.V. | Method of driving a discharge lamp, driving arrangement, and projector system |
WO2008083697A1 (en) * | 2006-12-20 | 2008-07-17 | Patent-Treuhand-Gesellschaft für elektrische Glühlampen mbH | Performance-dependant fan control for enlarging the dimming region of hid lamps |
WO2009092449A1 (en) * | 2008-01-24 | 2009-07-30 | Osram Gesellschaft mit beschränkter Haftung | Method and operating device for operating a high-pressure discharge lamp |
WO2009100755A1 (en) * | 2008-02-11 | 2009-08-20 | Osram Gesellschaft mit beschränkter Haftung | Method for operating a high-pressure discharge lamp |
US9395610B2 (en) | 2013-06-20 | 2016-07-19 | Seiko Epson Corporation | Light source, projector, and method of cooling discharge lamp |
Also Published As
Publication number | Publication date |
---|---|
US7654696B2 (en) | 2010-02-02 |
AU2003302860A1 (en) | 2004-06-30 |
CN1723742A (en) | 2006-01-18 |
EP1574115B1 (en) | 2008-06-11 |
ATE398388T1 (en) | 2008-07-15 |
CN1723742B (en) | 2010-09-29 |
JP4572117B2 (en) | 2010-10-27 |
DE60321599D1 (en) | 2008-07-24 |
EP1574115A1 (en) | 2005-09-14 |
US20060158125A1 (en) | 2006-07-20 |
JP2006510174A (en) | 2006-03-23 |
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