WO1999031940A1 - Dispositif d'alimentation pour boite a lumiere - Google Patents
Dispositif d'alimentation pour boite a lumiere Download PDFInfo
- Publication number
- WO1999031940A1 WO1999031940A1 PCT/FR1998/002739 FR9802739W WO9931940A1 WO 1999031940 A1 WO1999031940 A1 WO 1999031940A1 FR 9802739 W FR9802739 W FR 9802739W WO 9931940 A1 WO9931940 A1 WO 9931940A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- converter
- light box
- network
- supply
- powering
- 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
- H05B41/26—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
- H05B41/282—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
- H05B41/285—Arrangements for protecting lamps or circuits against abnormal operating conditions
- H05B41/2851—Arrangements for protecting lamps or circuits against abnormal operating conditions for protecting the circuit against abnormal operating conditions
- H05B41/2853—Arrangements for protecting lamps or circuits against abnormal operating conditions for protecting the circuit against abnormal operating conditions against abnormal power supply conditions
Definitions
- the present invention relates to devices intended to supply electrical power to a light box, that is to say a fluorescent lighting system making it possible, for example, to illuminate by transmission a liquid crystal display screen.
- Light boxes are known devices which make it possible to obtain, on a relatively large flat surface, generally of rectangular shape, light energy distributed in a very uniform manner making it possible to examine transparent objects.
- a light box can be used for a variety of purposes, such as examining photographic negatives. It is also widely used to illuminate liquid crystal display screens which are used more and more in place of cathode ray tubes.
- liquid crystal screens serve in particular as displays on board aircraft to give the pilot the information he needs, in particular the indications which were previously displayed using electromechanical indicators.
- a light box used to illuminate a liquid crystal display screen in an aircraft consists, for the purposes of uniformity of lighting and light intensity, of a battery of fluorescent tubes aligned against each other the others and supplied with a high voltage, of the order of 1000 volts, delivered by a high voltage converter.
- the term “light box” will denote in the following text the assembly composed of the battery of fluorescent tubes and its high voltage power converter. To obtain a very stable lighting, not presenting disturbing fluctuations for the operator, it is necessary to supply the light box by direct voltage, the value of which can be between 25 and 50 volts but must be very stable.
- a supply device comprising a galvanically isolated regulated converter.
- a power supply 1 01 supplies on the one hand a light box 1 02 and on the other hand a set of electronic cards 1 03 intended for the processing of information to be addressed to the LCD display screen not shown in this figure and which is fixed to the surface of the light box 1 02.
- This light box 1 02 itself comprises in a known manner a set of fluorescent tubes 1 04 supplied by a high voltage converter comprising a cutter 1 05 and a step-up transformer 1 06.
- the power supply device 1 01 operates from an input voltage + 28 volts, which we have seen that it is widely fluctuating. This charges, via an isolation diode 108, a set of capacitors 109. This diode makes it possible both to protect the equipment against reverse polarity and to avoid reverse discharge of the capacitors in the power supply network during power cuts. These capacitors themselves allow guarantee the supply of the downstream circuits during these possible interruptions.
- the capacitors 1 09 also make it possible to supply two regulated voltage converters 1 1 0 and 1 1 1 intended respectively to supply the light box 1 02 and the electronic cards 1 03.
- These capacitors are for example of the known type "Flybac” or “Forward” which we know the yield is between 80 and 85%. This efficiency, which might appear suitable in other circumstances, nevertheless has drawbacks in an aircraft where the available power is counted and where the heat from the corresponding losses must be dispersed.
- converters of this type are relatively expensive and bulky.
- the converter 1 1 0 is of the continuous-continuous regulator and step-up type with galvanic isolation. It provides the supply voltage of the light box 1 02. This supply voltage is for example 50 volts to be at the upper limit of variations in the supply voltage from the DC network + 28 volts.
- the converter 1 1 1 is of the DC-DC regulator type with galvanic isolation and makes it possible to deliver all the voltages necessary for the electronic cards 1 03, for example + 5 volts + 1 5 volts and - 1 5 volts.
- the invention provides a supply device for a light box from an unstable supply network, of the type comprising means of protection against reverse polarity and cuts in this network, a capacitor forming a reserve of energy and a DC-DC regulator converter to obtain from the network the stabilized supply voltage of the light box, mainly characterized in that this converter is directly supplied by the network, which 'It is of the booster type comprising an output diode which also plays the role of said protection means, and that said capacitor is connected directly at the output of the converter to be charged by the supply voltage of the light box.
- the device further comprises a second DC-DC regulator converter of the step-down type with galvanic isolation to obtain from the output voltage of the first converter a set of stabilized supply voltages necessary for the electronic control cards of a display device lit by the light box and the connection between these cards and this device display is carried out with a galvanic isolation device.
- the unstable supply network is of the 28 volt direct type and the supply voltage of the light box is substantially 50 volts.
- FIG. 1 the diagram of a device according to the invention.
- the device according to the invention shown diagrammatically in FIG. 1 comprises supply means 201 making it possible to deliver the supply voltages necessary for a light box 1 02 and for electronic control cards 1 03 which are identical to those of Figure 1.
- the input voltage of the network + 28 volts is directly applied to a DC-regulator converter 204 which is of the boost boost type without galvanic isolation.
- this converter very schematically comprises a series inductor 206 whose output is connected on the one hand to ground by a chopper 205 and on the other hand to a series diode 208 which directly delivers the output voltage of 50 volts required power supply to the light box 102.
- This converter 204 makes it possible to compensate for variations in the 28 volt network with very good efficiency, which we know can reach a value of the order of 95% for a converter of this type.
- the converter output diode 208 which participates in the voltage booster function, also makes it possible to carry out the function of protection against reverse polarity of the network and of blocking the reverse discharge of the energy reserve described below.
- the output of the converter 204 is in fact applied to a capacitor 209, furthermore connected to ground, which makes it possible to store the energy necessary for the device supplied by the block 201 during the moments when the sector + 28 is cut, or else goes down to a value lower than that which allows the converter 204 to make up for the voltage difference.
- this capacitor 209 which serves as an energy reserve, can be of a size significantly smaller than the capacitors 1 09, while making it possible to obtain the same protection duration with regard to cuts.
- the output voltage of the converter 204 also makes it possible to supply a converter 1 1 1 of the continuous-continuous type regulator with galvanic isolation which is used to deliver the output voltages necessary for the cards 1 03, for example + 5 volts + 1 5 volts and - 1 5 volts.
- This converter could be identical to the converter 1 1 1 of FIG. 1.
- the electronic boards 1 03 are on the other hand supplied by the converter 1 1 1, which has a galvanic isolation. To ensure complete protection of these cards, galvanic protection must then be provided in the connection between them and the display screen located on the light box.
- the invention therefore proposes to make this connection using interface means 21 0 which will make it possible to provide such galvanic isolation, for example by using transformers or known optically coupled systems.
- the device according to the invention makes it possible to obtain the same results from the point of view of stability, resistance to cuts and galvanic isolation as in the known art, while presenting a remarkable simplicity of embodiment, while providing a much better efficiency and presenting a particularly reduced bulk and weight.
Landscapes
- Devices For Indicating Variable Information By Combining Individual Elements (AREA)
- Dc-Dc Converters (AREA)
- Cage And Drive Apparatuses For Elevators (AREA)
Abstract
Description
Claims
Priority Applications (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US09/581,501 US6288912B1 (en) | 1997-12-16 | 1998-12-15 | Power supply device for a light box including first and second DC to DC convertors and energy reserve |
EP98959995A EP1040731B1 (fr) | 1997-12-16 | 1998-12-15 | Dispositif d'alimentation pour boite a lumiere |
DE69802114T DE69802114T2 (de) | 1997-12-16 | 1998-12-15 | Speiseschaltung eines leuchtkastens |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR97/15949 | 1997-12-16 | ||
FR9715949A FR2772525B1 (fr) | 1997-12-16 | 1997-12-16 | Dispositif d'alimentation pour boite a lumiere |
Publications (1)
Publication Number | Publication Date |
---|---|
WO1999031940A1 true WO1999031940A1 (fr) | 1999-06-24 |
Family
ID=9514679
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/FR1998/002739 WO1999031940A1 (fr) | 1997-12-16 | 1998-12-15 | Dispositif d'alimentation pour boite a lumiere |
Country Status (6)
Country | Link |
---|---|
US (1) | US6288912B1 (fr) |
EP (1) | EP1040731B1 (fr) |
DE (1) | DE69802114T2 (fr) |
ES (1) | ES2163305T3 (fr) |
FR (1) | FR2772525B1 (fr) |
WO (1) | WO1999031940A1 (fr) |
Families Citing this family (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR2815789B1 (fr) * | 2000-10-24 | 2003-01-31 | Thomson Csf | Dispositif d'alimentation electrique a haut niveau de securite |
TWI341511B (en) * | 2006-11-03 | 2011-05-01 | Chimei Innolux Corp | Power supply circuit |
TWM314869U (en) * | 2006-11-27 | 2007-07-01 | Innolux Display Corp | Power supply circuit for liquid crystal display device and liquid crystal display device using same |
TWI324435B (en) * | 2006-12-29 | 2010-05-01 | Innolux Display Corp | Inverter circuit |
US9291683B2 (en) | 2011-10-11 | 2016-03-22 | General Electric Company | Power module protection at start-up |
Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB2229873A (en) * | 1989-01-26 | 1990-10-03 | Koito Mfg Co Ltd | Lighting circuit with protection arrangement |
US5103138A (en) * | 1990-04-26 | 1992-04-07 | Orenstein Edward D | Switching excitation supply for gas discharge tubes having means for eliminating the bubble effect |
DE19511824A1 (de) * | 1994-03-30 | 1995-10-05 | Lg Electronics Inc | Lampenstartergerät für Flüssigkristallprojektor |
US5552681A (en) * | 1992-03-06 | 1996-09-03 | Hino Jidosha Kogyo Kabushiki Kaisha | Apparatus for storing energy generated during breaking of a vehicle and for providing energy to the internal combustion engine of the vehicle at other times |
WO1997013391A1 (fr) * | 1995-10-03 | 1997-04-10 | Pal Sandor | Ameliorations concernant un ballast electronique pour lampes fluorescentes |
Family Cites Families (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3573598A (en) * | 1969-05-16 | 1971-04-06 | Bell Telephone Labor Inc | Overload protected switching regulator-converter |
US4450384A (en) * | 1982-08-04 | 1984-05-22 | Mole-Richardson Company | DC Light dimmer control system |
US4797803A (en) * | 1987-12-23 | 1989-01-10 | Dci Technology | Switching power supply VCO |
FR2634957B1 (fr) * | 1988-07-29 | 1993-03-26 | Thomson Csf | Convertisseur de tension continu/continu de type cuk, et alimentation secteur a conversion directe realisee a partir d'un tel convertisseur |
-
1997
- 1997-12-16 FR FR9715949A patent/FR2772525B1/fr not_active Expired - Fee Related
-
1998
- 1998-12-15 WO PCT/FR1998/002739 patent/WO1999031940A1/fr active IP Right Grant
- 1998-12-15 EP EP98959995A patent/EP1040731B1/fr not_active Expired - Lifetime
- 1998-12-15 US US09/581,501 patent/US6288912B1/en not_active Expired - Fee Related
- 1998-12-15 ES ES98959995T patent/ES2163305T3/es not_active Expired - Lifetime
- 1998-12-15 DE DE69802114T patent/DE69802114T2/de not_active Expired - Fee Related
Patent Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB2229873A (en) * | 1989-01-26 | 1990-10-03 | Koito Mfg Co Ltd | Lighting circuit with protection arrangement |
US5103138A (en) * | 1990-04-26 | 1992-04-07 | Orenstein Edward D | Switching excitation supply for gas discharge tubes having means for eliminating the bubble effect |
US5552681A (en) * | 1992-03-06 | 1996-09-03 | Hino Jidosha Kogyo Kabushiki Kaisha | Apparatus for storing energy generated during breaking of a vehicle and for providing energy to the internal combustion engine of the vehicle at other times |
DE19511824A1 (de) * | 1994-03-30 | 1995-10-05 | Lg Electronics Inc | Lampenstartergerät für Flüssigkristallprojektor |
WO1997013391A1 (fr) * | 1995-10-03 | 1997-04-10 | Pal Sandor | Ameliorations concernant un ballast electronique pour lampes fluorescentes |
Also Published As
Publication number | Publication date |
---|---|
EP1040731B1 (fr) | 2001-10-17 |
ES2163305T3 (es) | 2002-01-16 |
US6288912B1 (en) | 2001-09-11 |
DE69802114D1 (de) | 2001-11-22 |
FR2772525A1 (fr) | 1999-06-18 |
EP1040731A1 (fr) | 2000-10-04 |
FR2772525B1 (fr) | 2000-03-17 |
DE69802114T2 (de) | 2002-06-06 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
CA2709574C (fr) | Convertisseur alternatif / continu a isolement galvanique | |
FR2471008A1 (fr) | Systeme avertisseur d'incendie | |
FR2394915A1 (fr) | Dispositif pour l'alimentation d'un moteur a courant continu comportant une batterie d'accumulateurs | |
EP0883051A1 (fr) | Système de fourniture d'une tension régulée | |
FR2650410A1 (fr) | Dispositif convertisseur d'energie a sorties multiples | |
FR2756984A1 (fr) | Alimentation de secours destinee a suppleer provisoirement a une carence d'une source d'alimentation principale | |
EP1040731B1 (fr) | Dispositif d'alimentation pour boite a lumiere | |
EP3010133B1 (fr) | Circuit de redressement contrôlé | |
EP0183597A1 (fr) | Circuit de protection contre les coupures d'alimentation électrique | |
FR3026581B1 (fr) | Transfert d'energie continu | |
FR2516335A1 (fr) | Dispositif de commande de l'intensite lumineuse d'un tube fluorescent alimente sur une tension continue | |
EP1854200A2 (fr) | Oscillateur de royer a electronique de decharge | |
EP0364346B1 (fr) | Boîte à lumière pour dispositif de visualisation avionique | |
EP0035727B1 (fr) | Système de distribution d'énergie pour ensembles électroniques | |
FR2931801A1 (fr) | Systeme et procede d'alimentation d'une charge electrique d'un aeronef | |
EP0970556B1 (fr) | Dispositif d'alimentation faible cout d'une pluralite de modules electroniques installes dans une baie | |
FR3092444A1 (fr) | Dispositif domotique de commande électronique à deux fils | |
EP0077531A1 (fr) | Dispositif de charge d'un ensemble de batteries, notamment de batteries tampons alimentées par une source d'énergie de puissance limitée | |
EP2326144B1 (fr) | Dispositif d'éclairage à diodes électroluminescentes à circuit d'alimentation régulé | |
EP0450999B1 (fr) | Dispositif d'alimentation électrique à réserve d'énergie, en particulier pour un tube hyperfréquence | |
FR3068532A1 (fr) | Boitier de distribution d'energie electrique pour reseau de bord d'un aeronef et systeme d'alimentation electrique correspondant | |
FR3136614A1 (fr) | Système de fourniture d’énergie | |
FR2498024A1 (fr) | Interface convertisseur pour eclairage de securite a partir d'une alimentation continue avec batterie d'accumulateurs | |
EP0406143B1 (fr) | Voyant lumineux pouvant être alimenté avec une tension continue ou une tension alternative | |
EP1724910A2 (fr) | Alimentation de charges de puissances différentes par un convertisseur continu-continu |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
AK | Designated states |
Kind code of ref document: A1 Designated state(s): US |
|
AL | Designated countries for regional patents |
Kind code of ref document: A1 Designated state(s): AT BE CH CY DE DK ES FI FR GB GR IE IT LU MC NL PT SE |
|
121 | Ep: the epo has been informed by wipo that ep was designated in this application | ||
DFPE | Request for preliminary examination filed prior to expiration of 19th month from priority date (pct application filed before 20040101) | ||
WWE | Wipo information: entry into national phase |
Ref document number: 09581501 Country of ref document: US |
|
WWE | Wipo information: entry into national phase |
Ref document number: 1998959995 Country of ref document: EP |
|
WWP | Wipo information: published in national office |
Ref document number: 1998959995 Country of ref document: EP |
|
WWG | Wipo information: grant in national office |
Ref document number: 1998959995 Country of ref document: EP |