EP3599796A1 - Bande lumineuse à del et système d'éclairage - Google Patents
Bande lumineuse à del et système d'éclairage Download PDFInfo
- Publication number
- EP3599796A1 EP3599796A1 EP19188110.1A EP19188110A EP3599796A1 EP 3599796 A1 EP3599796 A1 EP 3599796A1 EP 19188110 A EP19188110 A EP 19188110A EP 3599796 A1 EP3599796 A1 EP 3599796A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- led
- circuit board
- led light
- contact surfaces
- printed circuit
- 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
Links
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- 239000003990 capacitor Substances 0.000 claims abstract description 34
- 230000008878 coupling Effects 0.000 claims abstract description 28
- 238000010168 coupling process Methods 0.000 claims abstract description 28
- 238000005859 coupling reaction Methods 0.000 claims abstract description 28
- 238000006073 displacement reaction Methods 0.000 claims abstract description 9
- 239000000463 material Substances 0.000 claims description 5
- 239000004033 plastic Substances 0.000 claims description 3
- 229920003023 plastic Polymers 0.000 claims description 3
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 4
- 229910052802 copper Inorganic materials 0.000 description 4
- 239000010949 copper Substances 0.000 description 4
- 238000010586 diagram Methods 0.000 description 4
- 239000004642 Polyimide Substances 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- 229920001721 polyimide Polymers 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 2
- 230000004907 flux Effects 0.000 description 2
- 238000009499 grossing Methods 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 229920000139 polyethylene terephthalate Polymers 0.000 description 2
- 239000005020 polyethylene terephthalate Substances 0.000 description 2
- 239000004065 semiconductor Substances 0.000 description 2
- 241001465754 Metazoa Species 0.000 description 1
- 238000003491 array Methods 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 239000003086 colorant Substances 0.000 description 1
- 238000005530 etching Methods 0.000 description 1
- 238000005286 illumination Methods 0.000 description 1
- 230000001939 inductive effect Effects 0.000 description 1
- 238000002955 isolation Methods 0.000 description 1
- 230000005693 optoelectronics Effects 0.000 description 1
- 239000012044 organic layer Substances 0.000 description 1
- 230000000737 periodic effect Effects 0.000 description 1
- -1 polyethylene terephthalate Polymers 0.000 description 1
- 238000005476 soldering Methods 0.000 description 1
- 230000003595 spectral effect Effects 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
Images
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]
- H05B45/30—Driver circuits
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F21—LIGHTING
- F21S—NON-PORTABLE LIGHTING DEVICES; SYSTEMS THEREOF; VEHICLE LIGHTING DEVICES SPECIALLY ADAPTED FOR VEHICLE EXTERIORS
- F21S4/00—Lighting devices or systems using a string or strip of light sources
- F21S4/20—Lighting devices or systems using a string or strip of light sources with light sources held by or within elongate supports
- F21S4/22—Lighting devices or systems using a string or strip of light sources with light sources held by or within elongate supports flexible or deformable, e.g. into a curved shape
- F21S4/24—Lighting devices or systems using a string or strip of light sources with light sources held by or within elongate supports flexible or deformable, e.g. into a curved shape of ribbon or tape form, e.g. LED tapes
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F21—LIGHTING
- F21V—FUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
- F21V23/00—Arrangement of electric circuit elements in or on lighting devices
- F21V23/02—Arrangement of electric circuit elements in or on lighting devices the elements being transformers, impedances or power supply units, e.g. a transformer with a rectifier
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F21—LIGHTING
- F21Y—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES F21K, F21L, F21S and F21V, RELATING TO THE FORM OR THE KIND OF THE LIGHT SOURCES OR OF THE COLOUR OF THE LIGHT EMITTED
- F21Y2103/00—Elongate light sources, e.g. fluorescent tubes
- F21Y2103/10—Elongate light sources, e.g. fluorescent tubes comprising a linear array of point-like light-generating elements
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F21—LIGHTING
- F21Y—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES F21K, F21L, F21S and F21V, RELATING TO THE FORM OR THE KIND OF THE LIGHT SOURCES OR OF THE COLOUR OF THE LIGHT EMITTED
- F21Y2107/00—Light sources with three-dimensionally disposed light-generating elements
- F21Y2107/70—Light sources with three-dimensionally disposed light-generating elements on flexible or deformable supports or substrates, e.g. for changing the light source into a desired form
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F21—LIGHTING
- F21Y—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES F21K, F21L, F21S and F21V, RELATING TO THE FORM OR THE KIND OF THE LIGHT SOURCES OR OF THE COLOUR OF THE LIGHT EMITTED
- F21Y2115/00—Light-generating elements of semiconductor light sources
- F21Y2115/10—Light-emitting diodes [LED]
Definitions
- the present invention relates to a light-emitting diode light band (hereinafter “LED light band”) and a lighting system comprising such an LED light band.
- LED light band a light-emitting diode light band
- a lighting system comprising such an LED light band.
- LED light strips usually consist of segments, each typically having a length of approximately 50 mm. These segments are connected in parallel to each other and are usually operated with a constant DC voltage of 12 V or 24 V. Each of these segments usually has 6 or 7 LEDs.
- a light-emitting diode current of a segment is kept constant at a predetermined value by means of a current regulator.
- the light-emitting diode current of a segment is determined by means of an electrical resistance.
- Such LED light strips are simple and inexpensive to manufacture.
- a luminous flux of such an LED light band gradually drops over the length of the LED light band, since according to this variant no current regulator is provided. In both variants there are significant electrical losses that affect the efficiency of the LED light strips.
- the object of the present invention is to describe an LED light strip and a lighting system which eliminate or reduce the above-mentioned disadvantages of conventional LED light strips.
- this comprises a printed circuit board. At least one light-emitting diode, LED, is arranged on a first side of the circuit board. Furthermore, two electrically conductive contact surfaces are arranged on the first side of the circuit board for each LED. Two conductor tracks are arranged on a second side of the circuit board. Two of the electrically conductive contact areas are electrically connected with an LED. Of the contact areas that are electrically connected to the same LED, a contact area with one of the two conductor tracks forms a coupling capacitor. The coupling capacitors are set up to generate a displacement current for energizing the LED electrically connected to the contact surfaces, based on a high-frequency AC voltage applied to the conductor tracks in the contact surfaces.
- light-emitting diodes are understood to mean both light-emitting diode chips and LED components with such a light-emitting diode chip.
- the LEDs can be surface-mounted.
- a light-emitting diode chip can comprise optoelectronic semiconductor bodies or an organic layer sequence.
- the light-emitting diode chips can be semiconductor chips or OLED chips.
- the light-emitting diodes preferably emit light in the visible spectral range or in the UV range or in the IR range.
- LEDs arranged on the first side of the circuit board are supplied with energy independently of one another in a contactless manner via the conductor tracks arranged on the second side of the circuit board.
- Contactless in this context describes the lack of electrical contact between the electrically conductive contact surfaces and the conductor tracks. There is physical contact between the electrically conductive contact surfaces and the conductor tracks via the circuit board.
- Another advantage is that the individual LEDs are mounted on the circuit board in isolation from each other.
- the LEDs are not electrically interconnected.
- the lack of electrical interconnection between the LEDs, as is customary in conventional LED light strips, means that the LED light strip is simpler and more cost-effective to construct. This also enables the LED light strip to be separated between any LED. This is also not possible in conventional light strips due to the interconnection of the LEDs.
- no through-contacts through the printed circuit board are required for the LED light strip shown here, which likewise simplifies a manufacturing process for such a light strip and contributes to reducing the cost of the light strip.
- the coupling capacitors form a coupling resonant circuit with the inductances of the conductor tracks.
- the high-frequency alternating voltage that is applied to the conductor tracks can, for example, have a frequency corresponding to a resonance frequency of this coupling resonant circuit or can deviate from this resonance frequency.
- a rectifier circuit is arranged on the first side of the circuit board for each LED.
- the displacement current generated in the contact areas is converted into a direct current for operating the respective LEDs.
- so-called AC LEDs i.e. anti-parallel LEDs, used as LED.
- One of the anti-parallel LEDs is operated with one half-wave of the displacement current.
- the printed circuit board is at least partially made of a plastic material.
- the circuit board forms a dielectric of the coupling capacitors.
- polyimides or substances containing polyimide are suitable as the material for the printed circuit board.
- a material of the printed circuit board consists at least partially of polyethylene terephthalate, PET.
- the circuit board is elastically deformable.
- the entire LED light band is also elastically deformable. This makes possible flexible and versatile use of the LED light strip in a wide variety of applications.
- At least one further LED is arranged on the first side of the printed circuit board.
- the contact areas electrically connected to the at least one LED have a different area dimension than the contact areas electrically connected to the at least one further LED.
- An extension parallel to a main plane of extent of the printed circuit board is considered here as a flat extension of the contact areas.
- One advantage of this embodiment is that the differently dimensioned contact areas result in differently dimensioned coupling capacitors comprising the contact area and the conductor strip.
- the coupling capacitors of different LEDs thus have different capacitances. This results in different resonance frequencies for the coupling resonant circuits of different LEDs. Depending on a frequency of the applied AC voltage, certain LEDs can thus be operated with a resonance frequency of their associated resonant circuit, while other LEDs are operated at this frequency outside the resonance frequency of their associated resonant circuits. This enables a selectively controllable lumen output of individual LEDs or individual groups of LEDs on the LED light band.
- LEDs or LED groups with different color temperatures are provided with differently dimensioned coupling capacitors in the LED light band described here.
- the coupling capacitors of LEDs with a higher color temperature are dimensioned larger than the coupling capacitors of LEDs with a lower color temperature.
- daylight-like illuminations can be generated by dimming the LEDs or LED groups with different intensities with different color temperatures.
- the lighting system comprises an LED light strip described above. Furthermore, the lighting system comprises a feed device which is set up to apply a high-frequency AC voltage to the two conductor tracks of the LED light strip.
- the feed device is set up to apply a high-frequency AC voltage with a frequency in a range from 1 MHz to 10 MHz to the two conductor tracks.
- alternating voltages with other frequencies can also be used to operate the LED light strip.
- the feed device comprises a serial resonance converter, in particular a serial resonance converter with a full-bridge circuit.
- a serial resonance converter in particular a serial resonance converter with a full-bridge circuit.
- the LED light strip 1 comprises an elongated flexible strip-shaped printed circuit board 2.
- the printed circuit board has a width b1 of approximately 10 mm and a height h1 of approximately 100 ⁇ m, a base material of the printed circuit board being made of a polyimide There is a height of 50 microns.
- a plurality of LEDs 3 are mounted on a first side A of the printed circuit board 2.
- the LEDs 3 are arranged in a row along a main direction of extent of the LED light strip 1.
- the LEDs 3 can also be otherwise mounted on the printed circuit board 2.
- other shapes of the printed circuit board 2 than the elongated strip-shaped printed circuit board 2 shown here are of course also possible.
- Figure 2 shows a section of the LED light strip 2 according to Figure 1 , in which an LED 3 according to the plurality of LEDs 3 Figure 1 you can see.
- the LEDs 3 are each, for example, an LED chip provided with a leadframe-based plastic sheath, for example PLCC2 SMD LEDs, PLCC4 SMD LEDs or PLCC6 SMD LEDs, high-power SMD LEDs and / or LED chip arrays in SMD Housings (so-called CAS LEDs) which are mounted on the printed circuit board 2 using surface (SMD) mounting technology.
- a leadframe-based plastic sheath for example PLCC2 SMD LEDs, PLCC4 SMD LEDs or PLCC6 SMD LEDs, high-power SMD LEDs and / or LED chip arrays in SMD Housings (so-called CAS LEDs) which are mounted on the printed circuit board 2 using surface (SMD) mounting technology.
- SMD surface
- the LEDs 3 are LED chips which are mounted on the printed circuit board 2 using chip-onboard (COB) technology.
- COB chip-onboard
- the LEDs 3 are centered between two side edges of the printed circuit board 2 on the first side A. the circuit board 2 mounted.
- an electrically conductive contact surface 4 is arranged on the first side A of the circuit board 2 between each LED 3 and in each case one side edge of the circuit board 2.
- the contact surfaces 4 are rectangular copper islands which extend parallel to a main extension plane of the printed circuit board 2.
- the contact surfaces 4 have a height h2 of approximately 36 ⁇ m and a planar extent of approximately 32 mm 2 , with a width b2 of approximately 4 mm and a length 12 of approximately 8 mm.
- the contact surfaces 4 of different LEDs 3 can also have different planar dimensions. This is related to below Figure 3 described in more detail.
- the contact surfaces 4 are produced, for example, by etching a copper-coated printed circuit board.
- Two electrically conductive conductor tracks 5 are arranged on a second side B of the printed circuit board 2 opposite the first side A. Like the contact surfaces 4, the conductor tracks 5 are made of copper and extend parallel to one another along a longitudinal direction of the strip-shaped circuit board 2. The conductor tracks 5 each have a height h3 of approximately 36 ⁇ m and a width b3 of somewhat less than 5 mm. The conductor tracks 5, like the contact areas 4, are also etched out of a copper coating.
- Each LED 3 has two contact areas 4, ie each LED 3 is electrically connected to two contact areas 4.
- the contact areas 4 and the conductor tracks 5 are arranged on the printed circuit board 2 such that one of the two contact areas 4 connected to the same LED 3 is opposite one of the two conductor tracks 5. In particular, as large a part as possible overlaps one Expansion surface of the contact surface 4 or in each case the entire expansion surface of the contact surface 4 with an expansion surface of the opposite conductor track 5.
- Each contact surface 4 forms a coupling capacitor with the conductor track 5 opposite it.
- the contact areas 4 each represent a first electrode
- the conductor tracks 5 each represent a second electrode and the circuit board 2 located therebetween is a dielectric of these coupling capacitors.
- a displacement current is generated in the contact areas 4 by means of capacitive coupling.
- One of the conductor tracks 5 here represents an outgoing line, the other a ground return line for applying the high-frequency AC voltage.
- soldering points or other connection points for connecting the conductor tracks 5 with a feed device for applying the high-frequency AC voltage connect (not shown here).
- a rectifier circuit 6 is also mounted on the first side A of the circuit board 2 in order to operate the LEDs 3 with a direct current.
- the rectifier circuits 6 have diodes and capacitors for rectifying and smoothing the displacement currents which are generated in the contact surfaces 4. The rectifier circuits 6 are described in more detail with reference to FIG Figure 3 described.
- FIG Figure 3 shows a circuit diagram of a lighting system 7 according to an embodiment of the invention.
- the circuit diagram of the lighting system 7 shows a circuit of an LED light strip 1, for example, the LED light strip 1 according to the Figures 1 and 2 , of which only the wiring of a single LED 3 is shown here for the sake of simplicity.
- the circuit diagram of the lighting system 7 according to FIG Figure 3 a circuit of a feed device 8 for applying a high-frequency AC voltage to the conductor tracks 5.
- inductors 9 In the circuit of the LED light strip 1, two inductors 9 are shown, each with a capacitor 10 connected in series.
- the inductors 9 represent the self-inductors according to the Figures 1 and 2 Conductors 5 described.
- the capacitors 10 each represent the coupling capacitors belonging to an LED 3, each consisting of a contact area 4 and the opposite conductor track 5.
- the feed device 8 has a serial resonance converter which, by means of a full bridge circuit, applies an almost sinusoidal, high-frequency AC voltage to the capacitors 10 via the inductors 9. To generate the high-frequency alternating voltage, a voltage of +5 V is present at a first terminal 13 of the feed device 8, a second terminal 14 of the feed device 8 is connected to a ground potential GND.
- the feed device 8 also has transistors 15 which are switched in such a way that a predetermined frequency of the high-frequency AC voltage is generated.
- the rectifier circuit 6 has two diodes 11 to rectify the displacement currents generated in the contact surfaces 4.
- the diodes 11 are combined, for example, in one component as a so-called double diode.
- a double diode with a periodic peak voltage of 100 V, a forward current of 125 mA and a switching time of at most 4 ns can be used.
- the rectifier circuit also has two filter capacitors 12, which reduce residual ripple in the rectified voltage.
- a center between the two filter capacitors 12 forms a reference potential. In this way, a voltage that is as constant as possible for operating the LED 3 is generated.
- inductive elements such as coils, can also be used for smoothing.
- the transistors 15 are switched in such a way that the predetermined frequency of the high-frequency AC voltage which is present on the conductor tracks 5 corresponds to a resonance frequency of the resonant circuit, comprising the inductors 9 and the capacitors 10.
- the transistors 15 are switched such that the predetermined frequency of the high-frequency AC voltage deviates from the resonance frequency of the resonant circuit. The greater this deviation, the weaker the resonant coupling across the capacitors 10 and, accordingly, the weaker the current that flows through the LED 3. Lumen output of the LED 3 is reduced in this way. A luminous flux of the LED 3 is thus greater in the first operating mode than in the second operating mode.
- the resonance frequency of the resonant circuit is influenced, among other things, by the area of the coupling capacitors. It is thus possible to connect two LEDs with differently dimensioned contact areas, so that the resonance frequencies of the resonant circuits belonging to the LEDs vary. In this way, high-frequency AC voltages with different predetermined frequencies can be generated in the feed device 8, which for example correspond either to the resonant frequency of the resonant circuit of one LED or the other LED. One of the two LEDs is thus operated in the first operating mode, while the other LED is operated in the second operating mode.
- a predetermined frequency is selected which deviates, for example, by approximately 10% from the resonant frequency of the resonant circuit of the one LED and by approximately 5% from the resonant frequency of the resonant circuit of the other LED.
- entire groups of LEDs can be connected to differently dimensioned coupling capacitors, or any number of differently dimensioned coupling capacitors can be connected to corresponding LEDs, so that resonant circuits with any number of different resonance frequencies are present.
- the LEDs, which are connected to differently dimensioned coupling capacitors can have different colors or color temperatures. In this way, a wide variety of dimming scenarios and color constellations can be generated with the lighting system 7.
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Non-Portable Lighting Devices Or Systems Thereof (AREA)
- Circuit Arrangement For Electric Light Sources In General (AREA)
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE102018118151 | 2018-07-26 | ||
DE102018121451.0A DE102018121451B3 (de) | 2018-07-26 | 2018-09-03 | LED-Lichtband und Leuchtsystem |
Publications (2)
Publication Number | Publication Date |
---|---|
EP3599796A1 true EP3599796A1 (fr) | 2020-01-29 |
EP3599796B1 EP3599796B1 (fr) | 2021-02-24 |
Family
ID=67438798
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP19188110.1A Active EP3599796B1 (fr) | 2018-07-26 | 2019-07-24 | Bande lumineuse à del et système d'éclairage |
Country Status (1)
Country | Link |
---|---|
EP (1) | EP3599796B1 (fr) |
Citations (9)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20110084624A1 (en) * | 2008-06-17 | 2011-04-14 | Tim Dekker | Light emitting device adapted for ac drive |
US20130313983A1 (en) * | 2011-02-04 | 2013-11-28 | Koninklijke Philips N.V. | Lighting unit with led strip |
US20140191587A1 (en) * | 2011-08-16 | 2014-07-10 | Koninklijke Philips N.V. | Transparent capacitive wireless powering system |
US20140197695A1 (en) * | 2011-08-16 | 2014-07-17 | Koninklijke Philips N.V. | Conductive layer of a large surface for distribution of power using capacitive power transfer |
US20150270716A1 (en) * | 2012-10-02 | 2015-09-24 | Koninklijke Philips N.V. | Multi frequency power driver for a wireless power transfer system |
US20150289326A1 (en) * | 2012-10-15 | 2015-10-08 | Koninklijke Philips N.V. | Led package with capacitive couplings |
US20160234890A1 (en) * | 2013-09-24 | 2016-08-11 | Philips Lighting Holding B.V. | Wet processed electronic systems |
US20170328531A1 (en) * | 2014-10-21 | 2017-11-16 | Zkw Group Gmbh | Printed circuit board having a plurality of electronic components arranged on the printed circuit board in at least one group |
US20180124889A1 (en) * | 2014-09-28 | 2018-05-03 | Jiaxing Super Lighting Electric Appliance Co., Ltd | Led tube lamp |
-
2019
- 2019-07-24 EP EP19188110.1A patent/EP3599796B1/fr active Active
Patent Citations (9)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20110084624A1 (en) * | 2008-06-17 | 2011-04-14 | Tim Dekker | Light emitting device adapted for ac drive |
US20130313983A1 (en) * | 2011-02-04 | 2013-11-28 | Koninklijke Philips N.V. | Lighting unit with led strip |
US20140191587A1 (en) * | 2011-08-16 | 2014-07-10 | Koninklijke Philips N.V. | Transparent capacitive wireless powering system |
US20140197695A1 (en) * | 2011-08-16 | 2014-07-17 | Koninklijke Philips N.V. | Conductive layer of a large surface for distribution of power using capacitive power transfer |
US20150270716A1 (en) * | 2012-10-02 | 2015-09-24 | Koninklijke Philips N.V. | Multi frequency power driver for a wireless power transfer system |
US20150289326A1 (en) * | 2012-10-15 | 2015-10-08 | Koninklijke Philips N.V. | Led package with capacitive couplings |
US20160234890A1 (en) * | 2013-09-24 | 2016-08-11 | Philips Lighting Holding B.V. | Wet processed electronic systems |
US20180124889A1 (en) * | 2014-09-28 | 2018-05-03 | Jiaxing Super Lighting Electric Appliance Co., Ltd | Led tube lamp |
US20170328531A1 (en) * | 2014-10-21 | 2017-11-16 | Zkw Group Gmbh | Printed circuit board having a plurality of electronic components arranged on the printed circuit board in at least one group |
Non-Patent Citations (1)
Title |
---|
FEI LU ET AL: "A Review on the Recent Development of Capacitive Wireless Power Transfer Technology", ENERGIES, vol. 10, no. 11, 1 November 2017 (2017-11-01), pages 1752, XP055608398, DOI: 10.3390/en10111752 * |
Also Published As
Publication number | Publication date |
---|---|
EP3599796B1 (fr) | 2021-02-24 |
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