EP2238806A1 - Circuit d'attaque pour système de projection - Google Patents
Circuit d'attaque pour système de projectionInfo
- Publication number
- EP2238806A1 EP2238806A1 EP08708281A EP08708281A EP2238806A1 EP 2238806 A1 EP2238806 A1 EP 2238806A1 EP 08708281 A EP08708281 A EP 08708281A EP 08708281 A EP08708281 A EP 08708281A EP 2238806 A1 EP2238806 A1 EP 2238806A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- driver
- unit
- converter
- voltage
- power supply
- 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.)
- Withdrawn
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
- H05B45/00—Circuit arrangements for operating light-emitting diodes [LED]
- H05B45/40—Details of LED load circuits
- H05B45/44—Details of LED load circuits with an active control inside an LED matrix
- H05B45/46—Details of LED load circuits with an active control inside an LED matrix having LEDs disposed in parallel lines
-
- 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
- H05B45/00—Circuit arrangements for operating light-emitting diodes [LED]
- H05B45/30—Driver circuits
- H05B45/37—Converter circuits
- H05B45/3725—Switched mode power supply [SMPS]
- H05B45/382—Switched mode power supply [SMPS] with galvanic isolation between input and output
Definitions
- the invention relates to a driver for a plurality of semiconductor light sources according to the preamble of patent claim 1.
- LEDs light-emitting diodes
- a driver is provided for these LEDs.
- the driver includes suitable means for providing power, typically a plurality of such means, one for each LED color. Frequently, a single LED per color (red, green, blue) is provided, but it can also be several LEDs in a semiconductor light source branch fed by the means for providing power.
- the means for providing power are usually designed as linear regulators because they have fast switching times.
- the linear regulator is supplied with a voltage slightly higher than the maximum forward voltage of those of the three diodes (or the diode arrays in the individual branches) having the highest maximum forward voltage.
- the reverse voltage is a red light diode 4 V, a green light diode 6.2 V and a blue light diode 6.5 V
- the linear regulator with a voltage of 7 V or lower, at least slightly higher than 6.5 V, z. B. from 6.55 V to 7.0 V the.
- the disadvantage here is, on the one hand, that the linear regulator for the red-light diode is subjected to too high a voltage, and that the linear regulator for the green-light diode is also subjected to a voltage that is excessively high.
- the voltage of about 7 V or less in the driver is provided by a so-called pre-regulator, which is usually designed as a DC-DC converter.
- the pre-regulator is usually not connected directly to the mains.
- PFC Power Factor Corrector
- a DC-DC converter which supplies the pre-regulator with a voltage of, for example, 10 V DC.
- a power factor corrector is prescribed: It is to be simulated for the power supply an ohmic resistance. The previous arrangement appears very complicated on the whole.
- the object of the present invention is to provide a driver for a plurality of LEDs according to the preamble of patent claim 1, which can be connected as directly as possible to the network and thus enables an uncomplicated arrangement.
- the driver thus comprises a unit of power factor corrector (PFC) and at least one DC-DC converter, wherein at least one output of the DC-DC converter is connected directly to the means for providing power.
- PFC power factor corrector
- the power factor corrector is integrated into the driver, so that the driver can be connected directly to the network. It is no longer converted by a first DC-DC converter, the voltage from the mains voltage to 16 V and by a second DC-DC converter from 16 V to 7 V or less, but it is directly an output voltage through a single DC DC converter, which supplies the linear regulator with voltage.
- the unit does not necessarily have to be integrated into the driver, but can be coupled to it in the projection system where the driver is used. However, it eliminates in any case the previous Vorregler.
- the DC-DC converter is a flux converter, because this is a particularly common and therefore cost-effective converter.
- the arrangement enables an embodiment in which the unit integrated into the driver can provide different voltages simultaneously, at different outputs. Then, when each output is connected to a respective means for providing power, the exact voltage that is suitable for each diode or each diode branch can be provided so that not too much heat is generated.
- a unit which has the properties mentioned is z. As a commercially available ATX power supply, so a known computer power supply. This is available at low cost and can be easily integrated into a driver.
- the output voltages at the outputs of the unit are adjustable, namely controllable by control signals.
- the unit should have a control input for this purpose.
- this feature allows for the optimum adjustment of output voltages in driver-integrated power supplies that were not a priori built for such a driver.
- the above-mentioned ATX power supply usually includes such a control input (also referred to as "sense input").
- the driver has a digital control unit which controls the means for supplying current in the usual way.
- the digital control unit can just be coupled to this control input in order to supply the control signals to the unit.
- a circuit arrangement in which the driver can be used can dispense with any intermediate element between the driver and the power supply.
- the use of a driver and such an arrangement is claimed in claim 7.
- the driver according to the invention is preferably provided for supplying LEDs in a projection system, which is also claimed in claim 8. Brief description of the drawings
- Fig. 1 shows schematically the structure of a driver according to the prior art
- Fig. 2 shows schematically the structure of a driver according to the invention.
- a prior art driver shown in FIG. 1 and designated 10 is conventionally coupled in a projection system to a plurality of LEDs 12, 12 ', 12 ", with a red light emitting LED 12, a green light emitting LED 12'. and blue light emitting LED 12 ''.
- the task of the driver 10 is to apply power to the LEDs 12, 12 ', 12''.
- a linear regulator 14, 14 ', 14'' is provided in the driver for each LED color.
- a voltage is supplied to the linear regulators 14, 14 ', 14 ", and this should be between 3 and 10% higher than the highest maximum forward voltage of the diodes 12, 12', 12".
- the blocking voltage of the blue light emitting diode 12 '' is the highest, namely it is at 6.5 V, while that of the other diodes at 4 V (diode 12) or 6.2 V diode 12 ').
- the linear regulators 14, 14 ', 14 "should therefore be subjected to a voltage of approximately 7 V or less down to 6.5 V.
- the driver 10 comprises a pre-regulator 16, which is preferably designed as a DC-DC converter and an input voltage of z. B. 16V receives.
- the pre-regulator is in the state
- the technology is not directly connected to the network (“AC"), but it is preceded by a power supply 18, in which a power factor corrector (PFC) 20 and a DC-DC converter 22 are arranged.
- PFC power factor corrector
- DC-DC converter 22 DC-DC converter 22
- the driver 10 further comprises a digital control unit 24 (which is designed, for example, as a microcontroller), which receives control signals via an input 25 and converts these into suitable control signals for the linear controllers 14, 14 ', 14 " it sends them via a digital-to-analog converter 26 or 26 ', 26' 'to the linear arrays 14, 14', 14 ''.
- a digital control unit 24 which is designed, for example, as a microcontroller
- a driver 10 "according to the invention differs from the driver 10 in that it can be connected directly to the network (" AC ").
- a unit 16 ' is integrated into the driver from the driver 10, which has a power supply Factor Corrector 20 'in the manner of the Power Factor Corrector 20 from the power supply 18 and a DC-DC converter 22'
- the unit 16 ' may be a commercially available in a conventional power supply, such power supplies, in particular as computer power supplies available at low cost stand (eg so-called ATX power supplies).
- the unit 16 'no longer has only one output, but has several outputs 28, 28', 28 '', these outputs are each connected to a linear regulator 14, 14 'and 14''are connected.
- each linear regulator can be supplied with such a voltage, which between 3 and 10% above the maximum forward voltage of the respective spective diode controlled by the linear regulator.
- a voltage of 4.1 V can be output at the output 28, which is just above the voltage 4 V of the diode 12, at the output 28 ', a voltage of 6.3 V are applied, which is just above the blocking voltage of 6, 2V of the diode 12 'is located, and at the output 28'', a voltage of 6.6 V (or even the previous 7 V) are output, which is just above the reverse voltage of 6.5 V of the diode 12''.
- ATX power supply units have several such outputs. Not all ATX power supplies are a priori designed to deliver exactly the required voltages. The voltages are, however, controllable, via an input 30. In the driver 10 'is now the control input 30 of the unit 16' connected to a control output 32 of the control unit 24, so that the control unit 24, the voltages at the outputs 28, 28 ' , 28 '' can define.
- the driver 10 ' is built much more compact than the arrangement of driver 10 and power supply 18 in the prior art.
- the driver 10 ' can be connected directly to the mains. There is less heat loss because the individual linear regulators 14, 14 ', 14' 'are each subjected to its own voltage.
Landscapes
- Led Devices (AREA)
- Projection Apparatus (AREA)
- Dc-Dc Converters (AREA)
Abstract
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
PCT/EP2008/050962 WO2009095068A1 (fr) | 2008-01-28 | 2008-01-28 | Circuit d'attaque pour système de projection |
Publications (1)
Publication Number | Publication Date |
---|---|
EP2238806A1 true EP2238806A1 (fr) | 2010-10-13 |
Family
ID=40149848
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP08708281A Withdrawn EP2238806A1 (fr) | 2008-01-28 | 2008-01-28 | Circuit d'attaque pour système de projection |
Country Status (5)
Country | Link |
---|---|
US (1) | US20100309188A1 (fr) |
EP (1) | EP2238806A1 (fr) |
CN (1) | CN101926219A (fr) |
TW (1) | TW200939885A (fr) |
WO (1) | WO2009095068A1 (fr) |
Families Citing this family (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
TWI422276B (zh) * | 2009-09-30 | 2014-01-01 | Lumens Digital Optics Inc | 發光二極體光源的投影機電力控制方法 |
TWM389987U (en) * | 2010-05-28 | 2010-10-01 | Solytech Entpr Coropration | Composite power supply |
WO2013180500A1 (fr) * | 2012-06-01 | 2013-12-05 | 서울반도체 주식회사 | Dispositif d'affichage comprenant un rétroéclairage à del, et appareil d'alimentation et procédé d'alimentation de ce dispositif |
CN102916587B (zh) * | 2012-09-27 | 2015-05-06 | 苏州中傲信息技术有限公司 | 数字可调双极性高压电源 |
US9129561B2 (en) | 2013-03-07 | 2015-09-08 | International Business Machines Corporation | Systems and methods for displaying images |
WO2015080467A1 (fr) * | 2013-11-26 | 2015-06-04 | 엘지이노텍 주식회사 | Appareil d'alimentation électrique pour éclairage à led |
Family Cites Families (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US7202613B2 (en) * | 2001-05-30 | 2007-04-10 | Color Kinetics Incorporated | Controlled lighting methods and apparatus |
CN1452308A (zh) * | 2002-04-18 | 2003-10-29 | 姜涛 | 绿色开关电源 |
JP4177022B2 (ja) * | 2002-05-07 | 2008-11-05 | ローム株式会社 | 発光素子駆動装置、及び発光素子を備えた電子機器 |
CA2530661A1 (fr) * | 2005-12-16 | 2007-06-16 | Dellux Technologies Inc. | Ensemble de circuit electrique del |
TWI338169B (en) * | 2006-01-17 | 2011-03-01 | Chimei Innolux Corp | Led light source module and liquid crystal display thereof |
US7942548B2 (en) * | 2006-01-17 | 2011-05-17 | Mitsubishi Heavy Industries, Ltd. | Light-source lamp and projector |
KR20080001050A (ko) * | 2006-06-29 | 2008-01-03 | 삼성전기주식회사 | Led를 구비한 lcd 백라이트 구동 시스템 |
-
2008
- 2008-01-28 US US12/864,678 patent/US20100309188A1/en not_active Abandoned
- 2008-01-28 CN CN2008801257472A patent/CN101926219A/zh active Pending
- 2008-01-28 EP EP08708281A patent/EP2238806A1/fr not_active Withdrawn
- 2008-01-28 WO PCT/EP2008/050962 patent/WO2009095068A1/fr active Application Filing
-
2009
- 2009-01-20 TW TW098102009A patent/TW200939885A/zh unknown
Non-Patent Citations (1)
Title |
---|
See references of WO2009095068A1 * |
Also Published As
Publication number | Publication date |
---|---|
TW200939885A (en) | 2009-09-16 |
CN101926219A (zh) | 2010-12-22 |
US20100309188A1 (en) | 2010-12-09 |
WO2009095068A1 (fr) | 2009-08-06 |
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Legal Events
Date | Code | Title | Description |
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PUAI | Public reference made under article 153(3) epc to a published international application that has entered the european phase |
Free format text: ORIGINAL CODE: 0009012 |
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17P | Request for examination filed |
Effective date: 20100614 |
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AK | Designated contracting states |
Kind code of ref document: A1 Designated state(s): AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MT NL NO PL PT RO SE SI SK TR |
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AX | Request for extension of the european patent |
Extension state: AL BA MK RS |
|
DAX | Request for extension of the european patent (deleted) | ||
17Q | First examination report despatched |
Effective date: 20120330 |
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RAP1 | Party data changed (applicant data changed or rights of an application transferred) |
Owner name: OSRAM AG |
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STAA | Information on the status of an ep patent application or granted ep patent |
Free format text: STATUS: THE APPLICATION IS DEEMED TO BE WITHDRAWN |
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18D | Application deemed to be withdrawn |
Effective date: 20120810 |