EP1040731B1 - Dispositif d'alimentation pour boite a lumiere - Google Patents
Dispositif d'alimentation pour boite a lumiere Download PDFInfo
- Publication number
- EP1040731B1 EP1040731B1 EP98959995A EP98959995A EP1040731B1 EP 1040731 B1 EP1040731 B1 EP 1040731B1 EP 98959995 A EP98959995 A EP 98959995A EP 98959995 A EP98959995 A EP 98959995A EP 1040731 B1 EP1040731 B1 EP 1040731B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- light box
- converter
- network
- supply
- voltage
- 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 - Lifetime
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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
- H05B41/26—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 for supply electrical power to a light box, i.e. a fluorescent lighting system allowing for example to illuminate by transmission a liquid crystal display screen.
- Light boxes are known devices which allow to obtain on a relatively large flat surface, generally rectangular in shape, a distributed light energy of very uniform way to examine transparent objects.
- a light box can be used for different purposes, for example example to examine photographic negatives. She is also very used to illuminate crystal display screens by transparency increasingly used instead of spoke tubes cathodic.
- liquid crystal screens serve in particular as displays for on board aircraft to give the pilot the information they need necessary, 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 is constituted, for the purposes of uniformity of lighting and light intensity, of a battery of fluorescent tubes aligned against each other and powered by a large voltage, of the order of 1000 volts, delivered by a high voltage converter.
- a power supply device including a galvanically isolated regulating converter.
- Such device is for example made according to the diagram shown in Figure 1 attached.
- a power supply 101 supplies on the one hand a light box 102 and on the other hand a set of electronic cards 103 intended for the processing of information to be sent to the screen of LCD display not shown in this figure and which is fixed to the surface of the light box 102.
- This light box 102 itself comprises of known manner a set of fluorescent tubes 104 supplied by a high voltage converter comprising a cutter 105 and a step-up transformer 106.
- the supply device 101 operates from a voltage input + 28 volts, which we saw that it was widely fluctuating. This charges, via an isolation diode 108, a set of capacitors 109. This diode both protects the equipment against reverse polarity and avoid reverse discharge of capacitors in the supply network when it is cut. These capacitors themselves allow guarantee the supply of downstream circuits during these possible cuts.
- the capacitors 109 also make it possible to supply two regulated voltage converters 110 and 111 intended to supply respectively the light box 102 and the electronic cards 103.
- These capacitors are for example of the known type “Flyback” or “Forward” which we know the yield is between 80 and 85%. This yield, which may appear suitable in other circumstances, nevertheless has disadvantages in terms of aircraft where the available power is counted and where it is necessary to disperse the heat from the corresponding losses.
- the converters of this type are relatively expensive and bulky.
- the converter 110 is of the continuous-continuous regulator type and lift with galvanic isolation. It provides the voltage power supply of the light box 102. 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 111 is of the continuous-continuous regulator type with galvanic isolation and allows to deliver all voltages necessary for 103 electronic cards, for example + 5 volts + 15 volts and - 15 volts.
- the invention offers a feeding device for light box from a unstable supply network, of the type comprising means for protection against reverse polarity and cuts in this network, a capacitor forming an energy reserve and a DC-DC converter regulator to obtain from the network the voltage stabilized power supply of the light box, mainly characterized in that this converter is directly supplied by the network, that it is of the elevator type comprising an output diode which also plays the role of said means of protection, and that said capacitor is connected directly to the converter output 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 galvanic isolation to obtain from the output voltage of the first converter a set of stabilized supply voltages necessary for electronic control cards of a visualization lit by the light box and the connection between these cards and this display device is carried out with an isolation device galvanic.
- the supply network unstable is of the 28 volt DC type and the supply voltage of the light box is approximately 50 volts.
- the device according to the invention shown diagrammatically on FIG. 1 comprises supply means 201 making it possible to deliver the supply voltages necessary for a light box 102 and to control electronic cards 103 which are identical to those in Figure 1.
- the voltage + 28 volt network input is directly applied to a DC-DC converter regulator 204 which is of the “boost” type lift without galvanic isolation.
- this converter includes very schematically a 206 series inductor whose output is connected by a part to ground by a chopper 205 and secondly to a serial diode 208 which directly delivers the output voltage of 50 volts necessary for power to the light box 102.
- This converter 204 compensates for variations in the 28 volt network with very good performance, 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 allows to realize the function of protection against reverse polarity of the network and blocking of the reverse discharge of the energy reserve described below.
- the output of converter 204 is in fact applied to a capacitor 209, also connected to ground, which allows storage the energy required for the device supplied by block 201 during the moments when the sector + 28 is cut, or goes down to a value less than that which allows the converter 204 to catch up with the voltage difference.
- this capacitor 209 which serves as an energy reserve, can be of a size significantly smaller than capacitors 109, while allowing to obtain the same duration of protection against cuts.
- the output voltage of the converter 204 also allows to supply a converter 111 of the DC-DC regulator type to galvanic isolation which is used to deliver the necessary output voltages to cards 103, for example + 5 volts + 15 volts and - 15 volts.
- This converter could be identical to the converter 111 of Figure 1.
- the electronic cards 103 are however supplied by the converter 111, which has galvanic isolation. To ensure then a complete protection of these cards it is then necessary to ensure galvanic protection in the connection between them and the screen display located on the light box.
- the invention therefore proposes to make this connection using interface means 210 which will allow to provide such galvanic isolation, for example by using known transformers or optically coupled systems.
- the device according to the invention makes it possible to obtain the same results in terms of stability, cut resistance and galvanic isolation than in the known art, while presenting a remarkable simplicity of realization, providing a much better efficiency and by taking up space and weight particularly reduced.
Landscapes
- Devices For Indicating Variable Information By Combining Individual Elements (AREA)
- Cage And Drive Apparatuses For Elevators (AREA)
- Dc-Dc Converters (AREA)
Description
- la figure 1, le schéma d'un dispositif connu; et
- la figure 2, le schéma d'un dispositif selon l'invention.
Claims (3)
- Dispositif d'alimentation pour boíte à lumière (102) à partir d'un réseau d'alimentation instable, du type comprenant des moyens de protection contre les inversions de polarité et les coupures de ce réseau, un condensateur (209) connecté directement en sortie d'un convertisseur continu-continu régulateur du type élévateur (204) pour être chargé par la tension d'alimentation de la boíte à lumière (102) et ledit convertisseur continu-continu régulateur du type élévateur comportant une diode de sortie (208) pour obtenir à partir du réseau la tension d'alimentation stabilisée de la boíte à lumière, caractérisé en ce que ce convertisseur (204) est directement et en permanence alimenté par le réseau, que la dite diode (208) joue en outre le rôle des dits moyens de protection, et que ledit condensateur (209) forme réserve d'énergie.
- Dispositif selon la revendication 1, caractérisé en ce qu'il comprend en outre au moins un deuxième convertisseur continu-continu régulateur (111) du type abaisseur à isolement galvanique pour obtenir à partir de la tension de sortie du premier convertisseur un jeu de tensions stabilisées d'alimentation nécessaire aux cartes électroniques de commande (103) d'un dispositif de visualisation éclairé par la boíte à lumière et en ce que la liaison entre ces cartes et ce dispositif de visualisation s'effectue avec un dispositif d'isolement galvanique (210).
- Dispositif selon l'une quelconque des revendications 1 et 2 caractérisé en ce que le réseau d'alimentation instable est du type 28 volts continu et que la tension d'alimentation de la boíte à lumière (102) est de sensiblement 50 volts.
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR9715949A FR2772525B1 (fr) | 1997-12-16 | 1997-12-16 | Dispositif d'alimentation pour boite a lumiere |
FR9715949 | 1997-12-16 | ||
PCT/FR1998/002739 WO1999031940A1 (fr) | 1997-12-16 | 1998-12-15 | Dispositif d'alimentation pour boite a lumiere |
Publications (2)
Publication Number | Publication Date |
---|---|
EP1040731A1 EP1040731A1 (fr) | 2000-10-04 |
EP1040731B1 true EP1040731B1 (fr) | 2001-10-17 |
Family
ID=9514679
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP98959995A Expired - Lifetime EP1040731B1 (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 |
Family Cites Families (9)
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 |
US5068570A (en) * | 1989-01-26 | 1991-11-26 | Koito Manufacturing Co., Ltd. | Lamp lighting circuit with an overload protection capability |
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 |
KR100295322B1 (ko) * | 1994-03-30 | 2001-09-17 | 구자홍 | 램프의입력전압을이용한시동및구동제어장치 |
AU3575395A (en) * | 1995-10-03 | 1997-04-28 | Sandor Pal | Improvements in or relating to an electronic ballast for fluorescent lamps |
-
1997
- 1997-12-16 FR FR9715949A patent/FR2772525B1/fr not_active Expired - Fee Related
-
1998
- 1998-12-15 US US09/581,501 patent/US6288912B1/en not_active Expired - Fee Related
- 1998-12-15 EP EP98959995A patent/EP1040731B1/fr not_active Expired - Lifetime
- 1998-12-15 DE DE69802114T patent/DE69802114T2/de not_active Expired - Fee Related
- 1998-12-15 WO PCT/FR1998/002739 patent/WO1999031940A1/fr active IP Right Grant
- 1998-12-15 ES ES98959995T patent/ES2163305T3/es not_active Expired - Lifetime
Also Published As
Publication number | Publication date |
---|---|
DE69802114T2 (de) | 2002-06-06 |
EP1040731A1 (fr) | 2000-10-04 |
FR2772525B1 (fr) | 2000-03-17 |
US6288912B1 (en) | 2001-09-11 |
ES2163305T3 (es) | 2002-01-16 |
FR2772525A1 (fr) | 1999-06-18 |
WO1999031940A1 (fr) | 1999-06-24 |
DE69802114D1 (de) | 2001-11-22 |
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