EP1931179A1 - Variables LED-Beleuchtungssystem - Google Patents

Variables LED-Beleuchtungssystem Download PDF

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Publication number
EP1931179A1
EP1931179A1 EP07122131A EP07122131A EP1931179A1 EP 1931179 A1 EP1931179 A1 EP 1931179A1 EP 07122131 A EP07122131 A EP 07122131A EP 07122131 A EP07122131 A EP 07122131A EP 1931179 A1 EP1931179 A1 EP 1931179A1
Authority
EP
European Patent Office
Prior art keywords
light
group
emitting diodes
switch
diodes
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.)
Granted
Application number
EP07122131A
Other languages
English (en)
French (fr)
Other versions
EP1931179B1 (de
Inventor
Jean-Louis Lovato
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.)
Schneider Electric Industries SAS
Original Assignee
Schneider Electric Industries SAS
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 Schneider Electric Industries SAS filed Critical Schneider Electric Industries SAS
Publication of EP1931179A1 publication Critical patent/EP1931179A1/de
Application granted granted Critical
Publication of EP1931179B1 publication Critical patent/EP1931179B1/de
Not-in-force legal-status Critical Current
Anticipated expiration legal-status Critical

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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
    • 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
    • H05B45/48—Details of LED load circuits with an active control inside an LED matrix having LEDs organised in strings and incorporating parallel shunting devices

Definitions

  • the present invention relates to a device with variable illumination.
  • the variable lighting device according to the invention comprises in particular several groups of light-emitting diodes.
  • a lighting device employing a plurality of light-emitting diodes.
  • the diodes are arranged in a matrix.
  • a variable resistor adjusts the intensity of the current delivered in all light emitting diodes. The adjustment of the overall luminous flux is thus achieved by controlling the luminous intensity of all the diodes at the same time.
  • the object of the invention is to provide a device with variable lighting for adjusting the overall luminous flux by avoiding the use of a variable resistor, without necessarily soliciting all the diodes at the same time and optimizing the power consumption .
  • the principle proposed in the invention is to illuminate only the number of light-emitting diodes necessary to obtain the required luminous flux.
  • the invention The proposed method therefore makes it possible to save energy compared to the devices of the prior art.
  • a switch is placed in parallel with each group of light-emitting diodes.
  • the number of light-emitting diodes may be different in each group of diodes.
  • each group of diodes may for example comprise 2 n light-emitting diodes, n being an integer greater than or equal to zero and incremented from one group of diodes to another.
  • each group may comprise a single light-emitting diode.
  • the diodes are for example capable of generating a luminous flux of different intensity. In this way, several light intensity adjustment levels can be obtained from a reduced number of light-emitting diodes.
  • the device comprises a plurality of current generators each assigned to a group of light-emitting diodes.
  • the current generators may for example each deliver a current at a different intensity to generate different light flux at each diode.
  • the device may also comprise a common current generator supplying all groups of light-emitting diodes. This is particularly the case when all the diodes are identical.
  • the device also comprises a flux summation optical system that produces the sum of the light fluxes generated by each light-emitting diode that is lit.
  • the switch may be of the electronic type such as a transistor.
  • the switch can also be mechanical type, manufactured for example in MEMS technology. It will then include a ferromagnetic membrane controllable by magnetic effect between two states to control a group of light-emitting diodes.
  • This type of ferromagnetic membrane switch is controlled by a permanent magnet creating a permanent magnetic field imposing on the membrane one of its two states and an excitation coil capable of creating a temporary magnetic field to control the tilting of the membrane in the other of its two states by inversion of the magnetic torque exerted on the membrane.
  • the switches are designated by the references 2, 12, 102, the light-emitting diodes by the references 3, 13, 103, and the current generators by the references 4. , 14, 104.
  • the invention relates to a device with variable illumination 1, 10, 100.
  • This device comprises several light-emitting diodes.
  • the light-emitting diodes 3, 13, 103 are divided into several groups or cells A, B, C, D, ... Each group A, B, C, D, ... comprises at least one light-emitting diode 3, 13, 103 If a group comprises several light-emitting diodes, these are placed in series. However, it should be understood that a light-emitting diode can be replaced by a set of diodes associated in series and / or in parallel ( figure 12 ). In the appended figures, the conventional symbol of the diode is used and must be understood as being able to represent a single diode or a set of diodes associated in series and / or in parallel as illustrated on FIG. figure 12 .
  • the device may comprise an optical system for summing the luminous fluxes SO making it possible to collect all the light fluxes generated by the light-emitting diodes 3, 13, 103 of the groups, to homogenize and to distribute this set of luminous flux then to diffuse it in the space to be illuminated.
  • This optical system of summation of the luminous flux SO can be realized by a specific optical part, for example a lens or a diffuser, or directly by the luminaire.
  • the light-emitting diode (s) 3, 30, 300 are controlled by a switch 2, 12, 102 placed in parallel with the diode or the light-emitting diodes of the group. Since the switch 2, 12, 102 is connected in parallel with the diode or the light-emitting diodes of a group, the diode or the light-emitting diodes of a group are thus lit when the switch is in the open state and they are off when in the closed state.
  • switches are shown in conventional manner. However, these representations must be understood as encompassing all types of switches described in this application.
  • This switch can be of the electronic type. It will for example be a MOSFET transistor.
  • the switch may be of the mechanical type, for example manually operated.
  • the switch can also be an electromechanical relay or a MEMS type micro-switch (for "Micro-Electro-Mechanical System").
  • a microswitch M with magnetic actuation as shown in FIG. Figures 7 and 8 comprises a movable element mounted on a substrate S made of materials such as silicon, glass, ceramics or in the form of printed circuits.
  • the substrate S carries on its surface 30 at least two contacts or conductive tracks 31, 32 plane, identical and spaced, intended to be electrically connected by a movable electrical contact 21 to obtain the closure of an electrical circuit (not shown) .
  • the movable element is composed of a deformable membrane 20 having at least one layer of ferromagnetic material.
  • the membrane has a longitudinal axis (A) and is integral with the substrate S by means of two linking arms 22a, 22b connecting said membrane 20 to two anchoring studs 23a, 23b arranged symmetrically on either side of its longitudinal axis (A).
  • the membrane 20 is able to pivot between an open position and a closed position along an axis of rotation (R) parallel to the axis described by the contact points of the membrane 20 with the electric tracks 31, 32 and perpendicular to its longitudinal axis (A).
  • the movable electrical contact 21 is disposed under the membrane 20, at one end thereof.
  • the movable contact 21 When the membrane 20 is in the closed position, the movable contact 21 electrically connects the two fixed conductive tracks 31, 32 disposed on the substrate so as to close the electrical circuit. When the membrane 20 is in the open position, the movable contact 21 is moved away from the two conductive tracks so as to open the electrical circuit.
  • Such a microswitch M can be realized by a planar duplication technology of the MEMS type (for "Micro Electro-Mechanical System”).
  • the membrane 20 and the connecting arms 22a, 22b are for example derived from the same layer of ferromagnetic material.
  • the ferromagnetic material is for example of the soft magnetic type and can be for example an alloy of iron and nickel ("permalloy" Ni 80 Fe 20 ).
  • the magnetic actuation of a microswitch M as represented in FIG. figure 7 is to subject the membrane 20 to a permanent magnetic field B 0 , preferably uniform and for example direction perpendicular to the surface 30 of the substrate S to maintain the membrane 20 in each of its positions, and to apply a temporary magnetic field Bc control to control the passage of the membrane 20 from one position to the other, by reversing the magnetic torque exerted on the membrane.
  • a permanent magnetic field B 0 preferably uniform and for example direction perpendicular to the surface 30 of the substrate S to maintain the membrane 20 in each of its positions
  • a permanent magnet (not shown) is used, for example fixed under the substrate S.
  • the temporary magnetic field Bc is for example generated using a planar excitation coil 4 associated with the micro switch M ( figure 8 ).
  • the passage of a current in the planar excitation coil 4 generates a temporary magnetic field of direction parallel to the substrate S and parallel to the longitudinal axis (A) of the membrane 20 to control, according to the direction of the current in the coil , the tilting of the membrane 20 from one of its positions to the other of its positions.
  • the operation of such a microswitch M is detailed below in connection with the Figures 9 to 11 .
  • the substrate S supporting the membrane 20 is placed under the effect of the permanent magnetic field B 0 already defined above.
  • the first magnetic field B 0 initially generates a magnetic component BP 2 in the membrane 20 along its longitudinal axis (A).
  • the magnetic torque resulting from the first magnetic field B 0 and the BP component 2 generated in the membrane 20 holds the membrane 20 in one of its positions, for example the closed position on the figure 9 .
  • the passage of a control current in the excitation coil 4 in a defined direction makes it possible to generate the temporary control magnetic field Bc whose direction is parallel to the substrate S, its direction depending on the direction of the current delivered in the coil 4.
  • the temporary magnetic field Bc generates the magnetic component BP 3 in the magnetic layer of the membrane 20. If the control current is delivered in an appropriate direction, this new magnetic component BP 3 opposes the BP component 2 generated in the magnetic layer of the membrane 20 by the first magnetic field B 0 . If the BP component 3 is of greater intensity than that generated by the first magnetic field B 0 , the magnetic torque resulting from the first magnetic field B 0 and this BP 3 component is reversed and causes the membrane 20 to tilt. closing position to its open position ( figure 10 ).
  • the magnetic field Bc is generated only transiently to tilt the membrane 20 from one position to another.
  • the membrane 20 is then kept in its open position under the effect of the only first magnetic field B 0 creating a new magnetic component BP 4 in the membrane 20 and therefore a new magnetic torque imposing on the membrane 20 to remain in its open position ( figure 11 ).
  • this control and actuation principle can be used to individually address each microswitch controlling each group of light-emitting diodes.
  • the light-emitting diodes 3, 13, 103 used in the device 1, 10, 100 may all be identical. At identical current, they will therefore all generate the same luminous flux.
  • a light-emitting diode is characterized by its electro-optical efficiency, its nominal power, its technology and its color.
  • the light-emitting diodes 3, 13, 103 may be different. At the same current, two different diodes will emit with different luminous fluxes.
  • a separate current generator 4, 14, 104 may be associated with each group of light-emitting diodes.
  • the current generators may all be identical to each generate a current of identical intensity for the groups of diodes. In this case, if the diodes are identical, they will all produce an identical luminous flux. On the other hand, if in this case the diodes are different, they will produce different light fluxes.
  • the current generators may also be different from each other to generate different currents for the light-emitting diode groups.
  • the light-emitting diodes are identical or different, they will produce different light fluxes.
  • a common current generator 4 ', 14', 104 ' to supply all the diodes of all the groups. This is the case, for example, when all the light-emitting diodes used in the device are identical.
  • the device comprises selection means MS adapted for example to send a control current to each switch 2, 12, 102 to control its switching.
  • the selection means MS receive an input information IE and include processing means for processing this input information IE.
  • IE input information is for example a determined light intensity.
  • the selection means MS control the switching of one or more switches 2, 12, 102 of the device 1, 10, 100.
  • the input information IE can for example be generated directly by manual actuation. a button or can for example come from a computer system energy management.
  • variable lighting device using the principles defined above are represented in Figures 1 to 6 and are explained below.
  • the device 1 represented in figure 1 comprises electroluminescent diodes 3a, 3b, 3c, 3d of identical powers and current generators 4a, 4b, 4c, 4d are identical.
  • Each group A, B, C, D of diodes has an identical number of diodes (represented by a single diode on the figure 2 ).
  • This device 1 comprises as many adjustment levels as groups A, B, C, D of a light-emitting diode 3a, 3b, 3c, 3d.
  • the device 1 'represented in figure 2 is identical to that of the figure 2 except that it comprises a current generator 4 'common to all groups of light-emitting diodes 3a, 3b, 3c, 3d and that the groups A, B, C, D of diodes are placed in series in the circuit of the device.
  • the device 10 represented in figure 3 comprises electroluminescent diodes 13a, 13b, 13c, 13d all identical and current generators 14a, 14b, 14c, 14d identical.
  • the first group (A) comprises a single light-emitting diode 13a
  • the second group (B) comprises two light-emitting diodes 13b
  • the third group (C) comprises four light-emitting diodes 13c
  • the fourth group (D) comprises eight light-emitting diodes 13d.
  • the second group has 2 n light-emitting diodes.
  • the device 10 is identical to that of the figure 3 except that it comprises a current generator 14 'common to all groups of light-emitting diodes and the groups of diodes are placed in series in the circuit of the device.
  • the same number of adjustment levels as that of a device conforming to that of Figures 3 and 4 can be obtained by employing a single light-emitting diode 103a, 103b, 103c, 103d, 103e, 103f, 103g, 103h per group, each diode of a group being different from that of the other groups and / or each diode being fed by a generator current 104a, 104b, 104c, 104d, 104e, 104f, 104g, 104h different.
  • the light-emitting diodes 103a, 103b, 103c, 103d, 103e, 103f, 103g, 103h are all different and / or are supplied by current generators 104a, 104b, 104c, 104d, 104e, 104f, 104g, 104h different which allows them to generate each a different luminous flux.
  • a first current generator 104a and a first diode 103a are configured to generate a designated luminous flux, for example P
  • a second current generator 104b and a second diode 103b are configured to generate a luminous flux equal to 2P
  • a third current generator 104c and a third diode 103c are configured to generate a luminous flux equal to 4P
  • an n th current generator and an n th diode are configured to generate a luminous flux equal to 2n P.
  • the two hundred and fifty six adjustment levels defined above can thus be achieved by employing eight groups A, B, C, D, E, F, G, H diodes electroluminescent devices with a single diode (or set of diodes as shown in FIG. figure 12 ) by group.
  • the device 100 'of the figure 6 is identical to that of the figure 5 except that a common current generator 104 'is used in all light emitting diode groups and the groups of diodes are placed in series. In this case, in order to obtain the different levels of adjustment, it is the diodes that are all different in order to be able to generate each a different luminous flux from the same current.
  • the figure 13 it is possible to associate a device according to that of the figure 2 having nine groups of a light-emitting diode each, the diodes all being identical and being capable of generating each a luminous flux P, and a device also conforming to that of the figure 2 having nine groups of a light emitting diode each, the diodes all being identical and capable of generating each a luminous flux equal to 10P.
  • a device represented on the figure 13 is base ten but it is obvious that any other system operating according to another base can be used.
  • the selection means MS are for example common to both devices of the system.

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  • Circuit Arrangement For Electric Light Sources In General (AREA)
EP07122131.1A 2006-12-08 2007-12-03 Variables LED-Beleuchtungssystem Not-in-force EP1931179B1 (de)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR0655391A FR2909831B1 (fr) 2006-12-08 2006-12-08 Dispositif a eclairage variable a diodes electroluminescentes

Publications (2)

Publication Number Publication Date
EP1931179A1 true EP1931179A1 (de) 2008-06-11
EP1931179B1 EP1931179B1 (de) 2013-04-10

Family

ID=38110331

Family Applications (1)

Application Number Title Priority Date Filing Date
EP07122131.1A Not-in-force EP1931179B1 (de) 2006-12-08 2007-12-03 Variables LED-Beleuchtungssystem

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EP (1) EP1931179B1 (de)
FR (1) FR2909831B1 (de)

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19750559C1 (de) * 1997-11-14 1999-02-04 Fraunhofer Ges Forschung Mikrorelais
US5872496A (en) * 1993-12-20 1999-02-16 The Nippon Signal Co., Ltd. Planar type electromagnetic relay and method of manufacturing thereof
EP0955619A1 (de) * 1998-05-05 1999-11-10 Sagem Sa Verkehrssignalisierungsverwaltungsverfahren
US20040090403A1 (en) * 2002-11-08 2004-05-13 Dynascan Technology Corp. Light-emitting diode display apparatus with low electromagnetic display
US20050007777A1 (en) * 2003-07-07 2005-01-13 Klipstein Donald J. LED lamps and LED driver circuits for the same
US20050243022A1 (en) * 2004-04-30 2005-11-03 Arques Technology, Inc. Method and IC driver for series connected R, G, B LEDs
US20060244396A1 (en) * 2005-04-29 2006-11-02 Constantin Bucur Serial powering of an LED string

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5872496A (en) * 1993-12-20 1999-02-16 The Nippon Signal Co., Ltd. Planar type electromagnetic relay and method of manufacturing thereof
DE19750559C1 (de) * 1997-11-14 1999-02-04 Fraunhofer Ges Forschung Mikrorelais
EP0955619A1 (de) * 1998-05-05 1999-11-10 Sagem Sa Verkehrssignalisierungsverwaltungsverfahren
US20040090403A1 (en) * 2002-11-08 2004-05-13 Dynascan Technology Corp. Light-emitting diode display apparatus with low electromagnetic display
US20050007777A1 (en) * 2003-07-07 2005-01-13 Klipstein Donald J. LED lamps and LED driver circuits for the same
US20050243022A1 (en) * 2004-04-30 2005-11-03 Arques Technology, Inc. Method and IC driver for series connected R, G, B LEDs
US20060244396A1 (en) * 2005-04-29 2006-11-02 Constantin Bucur Serial powering of an LED string

Also Published As

Publication number Publication date
FR2909831B1 (fr) 2009-01-16
EP1931179B1 (de) 2013-04-10
FR2909831A1 (fr) 2008-06-13

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