EP0594245B1 - Ensemble d'illumination et lampe à décharge basse pression sans électrode apte à l'utilisation dans cet ensemble - Google Patents

Ensemble d'illumination et lampe à décharge basse pression sans électrode apte à l'utilisation dans cet ensemble Download PDF

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Publication number
EP0594245B1
EP0594245B1 EP19930202877 EP93202877A EP0594245B1 EP 0594245 B1 EP0594245 B1 EP 0594245B1 EP 19930202877 EP19930202877 EP 19930202877 EP 93202877 A EP93202877 A EP 93202877A EP 0594245 B1 EP0594245 B1 EP 0594245B1
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EP
European Patent Office
Prior art keywords
winding
secondary winding
turns
primary
coil
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
Application number
EP19930202877
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German (de)
English (en)
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EP0594245A1 (fr
Inventor
Petrus Hendrikus Antonis
Jacob Schlejen
Leonardus Urbanus Emile Konings
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Koninklijke Philips NV
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Koninklijke Philips Electronics NV
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Priority to EP19930202877 priority Critical patent/EP0594245B1/fr
Publication of EP0594245A1 publication Critical patent/EP0594245A1/fr
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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J65/00—Lamps without any electrode inside the vessel; Lamps with at least one main electrode outside the vessel
    • H01J65/04—Lamps in which a gas filling is excited to luminesce by an external electromagnetic field or by external corpuscular radiation, e.g. for indicating plasma display panels
    • H01J65/042—Lamps in which a gas filling is excited to luminesce by an external electromagnetic field or by external corpuscular radiation, e.g. for indicating plasma display panels by an external electromagnetic field
    • H01J65/048—Lamps in which a gas filling is excited to luminesce by an external electromagnetic field or by external corpuscular radiation, e.g. for indicating plasma display panels by an external electromagnetic field the field being produced by using an excitation coil

Definitions

  • the invention relates to an illumination unit comprising an electrodeless low-pressure discharge lamp and a high-frequency electric supply device, which lamp is provided with a discharge vessel sealed in a gastight manner and containing an ionizable filling and with a coil comprising Np turns of a primary winding and Ns turns of a secondary winding, which supply device is provided with input terminals, with an output terminal which is electrically neutral with respect to mass and which is connected to a first end of the primary winding, and with a further output terminal which is connected to a second end of the primary winding, a high-frequency magnetic field being generated by the primary winding in a nominal operating condition, which field maintains an electric discharge in the discharge vessel and induces a potential gradient in the secondary winding in a direction from a first end which is electrically neutral with respect to mass to a second, free end of the secondary winding, which gradient is oppositely directed to the potential gradient from the first to the second end in the primary winding.
  • the invention also relates to an electrodeless low-pressure discharge lamp suitable for use in the illumination unit.
  • Such an illumination unit is known from EP 0.162.504 A1.
  • the discharge vessel of the lamp of this illumination unit has a luminescent layer at the inside and is provided with a filling comprising mercury.
  • the coil which has 13 turns in a primary winding over a length of 25 mm and 14.5 turns in a secondary winding over a length of 30 mm, is provided around a core of soft magnetic material of 50 mm length.
  • a potential distribution across the coil resulting from the potential gradient occurring in each of the windings causes an electric field which is of importance for lamp ignition.
  • the asymmetrical supply device used in the illumination unit where one of the terminals has a potential which at least substantially corresponds to mass and the other has a potential different therefrom, may be comparatively simple compared with a symmetrical supply device, i.e. a supply device with connection terminals which have mutually opposite potentials with respect to mass.
  • a disadvantage of the known illumination unit is that the lamp ignites with comparatively great difficulty compared with a lamp of an illumination unit in which the coil has no secondary winding. This has the result that the ignition circuit is heavily loaded during a prolonged period, which may lead to a reduced operating life. It is true that the ignition time can be shortened by offering a higher ignition voltage, but this renders the use of comparatively expensive components necessary.
  • a further object of the invention is to provide an electrodeless low-pressure discharge lamp suitable for use in such an illumination unit.
  • the illumination unit is for this purpose characterized in that in a first end portion of the coil which comprises half the number of the sum of the turns Np+Ns of the primary and the secondary winding, the primary and the secondary winding have Np1 and Ns1 turns respectively, wherein (Np1/Np) ⁇ (3/2)*(Ns1/Ns).
  • the term "relative number of turns” in the present description is understood to mean the number of turns of a winding in the first end portion divided by the total number of turns of this winding.
  • the coil of the illumination unit according to the invention has a resulting potential distribution which generates a comparatively strong electric field compared with that of a coil without the measure according to the invention but similar in all other respects. As a result, the lamp of the illumination unit ignites more quickly.
  • the coil of the illumination unit according to the invention may be provided, for example, with a first end portion having turns exclusively of the primary winding and with a second end portion having turns exclusively of the secondary winding.
  • the resulting potential distribution is at least substantially balanced relative to mass, so that the lamp of the illumination unit causes only little interference in the environment and the mains.
  • a preferred embodiment of the illumination unit according to the invention is characterized in that the primary and the secondary winding have the same winding direction.
  • the coil can then be readily manufactured with narrow tolerances.
  • the direction from the first end portion to the other end portion corresponds to the direction from the first to the second end of the secondary winding.
  • the lamp of the illumination unit according to the invention has, for example, a coil whose primary winding and secondary winding approximately overlap one another and are wound with pitches which increase in mutually opposing directions.
  • at least one fourth of the number of turns of each winding longitudinally extend to beyond the other winding.
  • the turns are wound with constant pitch.
  • the coil is encapsulated in an elastic substance.
  • the turns are then fixed in a simple manner.
  • a first embodiment of the illumination unit according to the invention shown in Fig. 1 comprises an electrodeless low-pressure discharge lamp 10 and a supply device 50.
  • the lamp 10 is provided with a pear-shaped discharge vessel 20 which is sealed in a gastight manner and has an ionizable filling 21 comprising 6 mg mercury and 180 mg of an amalgam of bismuth and indium in a weight ratio of 67:33.
  • the filling 21 in addition comprises argon at a filling pressure of 33 Pa.
  • the lamp 10 is also provided with a coil 30 having a length L s of 55 mm which is accommodated in a recess 22 of the discharge vessel.
  • the secondary winding has, for example, one or one and a half turn more than the primary winding.
  • the coil former 38 in Fig. 2 is depicted as transparent, and portions of the turns 31, 32 extending behind the coil former 38 are not shown.
  • the primary and the secondary winding 33, 34 have the same winding direction. In this case the two windings 33, 34 are wound clockwise.
  • the coil former 38 encloses a core 35 of soft magnetic material, formed by a rod of Philips 4C6 ferrite with a diameter of 12 mm and a length of 50 mm.
  • the coil has an air core, or the core is made of, for example, a synthetic resin or a ceramic material.
  • the primary and the secondary winding 33, 34 are both made of insulated copper wire with a core thickness of 0.87 mm.
  • the supply device 50 is provided with input terminals 51a,b.
  • the supply device 50 is also provided with an output terminal 52a which is electrically neutral with respect to the mass M and which is connected to a first end 36a of the primary winding 33 via a current supply conductor 53a, and provided with a further output terminal 52b which is connected to a second end 36b of the primary winding 33 via a current supply conductor 53b.
  • the primary winding 33 In a nominal operating condition, the primary winding 33 generates a high-frequency magnetic field which maintains an electric discharge in the discharge vessel 20.
  • a potential gradient is induced in the secondary winding 34 in a direction away from a first end 37a which is electrically neutral with respect to the mass M to a second free end 37b, which gradient is oppositely directed to the potential gradient from the first to the second end 36a,b in the primary winding 33.
  • the potential averaged over the surface of the coil 30 is approximately equal to that of the mass M.
  • the first end 37a of the secondary winding 34 is electrically neutral because it is connected to the first end 36a of the primary winding via a current conductor 53c.
  • the first end 37a may be connected, for example, to the mass M.
  • a first end portion 39a of the coil 30 comprising half the number of the sum of the turns Np+Ns of the primary 33 and the secondary winding 34
  • the primary and the secondary winding have Npl and Nsl turns respectively, wherein (Np1/Np) ⁇ (3/2)*(Ns1/Ns), the relative number of turns 31 of the primary winding 33 is more than 3/2 times the relative number of turns 32 of the secondary winding 34.
  • the direction from the first end portion 39a to the other end portion 39b corresponds to the direction from the first end 37a to the second end 37b of the secondary winding 34.
  • more than one fourth of the number of turns 31, 32 of each winding 33, 34 longitudinally extend to beyond the other winding 34, 33.
  • 4.5 of the 14.5 turns 31 of the primary winding 33 longitudinally extend to beyond the first end 37a of the secondary winding 34
  • 4.5 of the 14.5 turns 32 of the secondary winding 34 longitudinally extend to beyond the first end 36a of the primary winding 33.
  • the coil 30 is encapsulated in an elastic substance 40 (shown as transparent in the Figure). Q3-3600 silicone resin from Dow Corning was used in this case.
  • the discharge vessel 20 is provided at its inner surface with a layer 23 of green-luminescing terbium-activated cerium-magnesium aluminate and red-luminescing yttrium oxide activated by trivalent europium.
  • a layer is absent and the discharge vessel has a filling comprising an amalgam of sodium and mercury.
  • the discharge vessel 20 is fixed on a carrier 24 of synthetic resin into whose interior a coaxial cable 54 is passed, which cable is connected to the supply device 50 and whose current supply conductors 53a,b form a sheath and a core, respectively.
  • the supply device 50 is connected to connection terminals P, N of the mains by means of current conductors 55a,b.
  • the supply device has a housing 56 which is connected to the mass M via an earthing line 55c.
  • the carrier is provided with a lamp cap at an end remote from the discharge vessel, for example, an Edison lamp cap in which lamp cap contacts are connected to a supply device incorporated in the carrier.
  • the supply device of the embodiment of the illumination unit according to the invention described with reference to the Figures has a frequency of 2.65 MHz.
  • the lamp consumes a power of 70 W and has a light output of 5500 lm during nominal operation.
  • the ignition time of the lamp in this illumination unit was on average twice as short as that of a lamp in an illumination unit not according to the invention with a coil of the same length whose primary and secondary windings lie against one another over substantially the entire length, all other circumstances being equal.
  • the influence on the mains and on the environment was found to be of the same order of magnitude for both illumination units.

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  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Engineering & Computer Science (AREA)
  • Plasma & Fusion (AREA)
  • Non-Portable Lighting Devices Or Systems Thereof (AREA)
  • Circuit Arrangements For Discharge Lamps (AREA)
  • Discharge Lamps And Accessories Thereof (AREA)

Claims (10)

  1. Ensemble d'éclairage comportant une lampe à décharge à basse pression sans électrode (10) et un dispositif d'alimentation électrique haute fréquence (50), ladite lampe (10) est munie d'un récipient à décharge (20) scellé d'une manière étanche au gaz et contenant un remplissage ionisable (21), et d'une bobine (30) comportant Np spires (31) d'un enroulement primaire (33) et Ns spires (32) d'un enroulement secondaire (34), ledit dispositif d'alimentation (50) est muni de bornes d'entrée (51a, 51b), d'une borne de sortie (52a) qui est électriquement neutre par rapport à la masse (M) et qui est reliée électriquement à une première extrémité (36a) de l'enroulement primaire (33), et d'une nouvelle autre borne de sortie (52b) qui est reliée électriquement à une deuxième extrémité (36b) de l'enroulement primaire (33), un champ magnétique haute fréquence étant engendré par l'enroulement primaire (33) dans une condition de fonctionnement nominale, ledit champ maintient une décharge électrique dans le récipient à décharge (20) et induit un gradient de potentiel dans l'enroulement secondaire (34) dans une direction s'étendant à partir d'une première extrémité (37a) qui est électriquement neutre par rapport à la masse (M) vers une deuxième extrémité libre (37b) de l'enroulement secondaire (34), ledit gradient est dirigé d'une manière opposée vers le gradient de potentiel à partir de la première (36a) vers la deuxième extrémité (36b) dans l'enroulement primaire (33), caractérisé en ce que dans une première partie terminale (39a) de la bobine (30) qui comporte le demi-nombre de la somme des spires Np+Ns des enroulements primaire et secondaire les enroulements primaire et secondaire (33, 34) présentent Npl spires respectivement Ns1 spires où (Np1/Np) ≥ (3/2)*(Ns1/Ns).
  2. Ensemble d'éclairage selon la revendication 1, caractérisé en ce que les enroulements primaire (33) et secondaire (34) présentent la même direction d'enroulement.
  3. Ensemble d'éclairage selon la revendication 2, caractérisé en ce que la direction s'étendant à partir de la première partie terminale (39a) vers l'autre partie terminale (39b) correspond à la direction s'étendant à partir de la première (37a) vers la deuxième extrémité (37b) de l'enroulement secondaire (34).
  4. Ensemble d'éclairage selon la revendication 1, 2 ou 3, caractérisé en ce qu'au moins un quatrième du nombre de spires (31, 32) de chaque enroulement (33, 34) s'étend longitudinalement dans la direction longitudinale de la bobine au-delà de l'autre enroulement (34 respectivement 33).
  5. Ensemble d'éclairage selon l'une quelconque des revendications 1 à 4, caractérisé en ce que la bobine (30) est encapsulée dans une substance élastique (40).
  6. Lampe à décharge à basse pression sans électrode (10) convenable pour être utilisée dans un ensemble d'éclairage selon l'une quelconque des revendications 1 à 5, munie d'un récipient à décharge (20) scellé d'une manière étanche au gaz et contenant un remplissage ionisable (21), et munie d'une bobine (30) comportant Np spires (31) d'un enroulement primaire (33) et Ns spires (32) d'un enroulement secondaire (34), l'enroulement primaire (33) présentant une première extrémité (36a) adaptée à être reliée électriquement à une borne de sortie (52a) d'un dispositif d'alimentation électrique haute fréquence (50) qui est électriquement neutre par rapport à la masse (M) et une deuxième extrémité (36b) adaptée à être reliée électriquement à une nouvelle autre borne de sortie (52b) du dispositif d'alimentation (50), l'enroulement secondaire (34) présentant une première extrémité (37a) qui est adaptée à être reliée électriquement à la borne de sortie (52a) du dispositif d'alimentation (50) qui est électriquement neutre par rapport à la masse (M) et une deuxième extrémité libre (37b) de façon que dans une condition de fonctionnement nominale un champ magnétique haute fréquence soit engendré par l'enroulement primaire (33), ledit champ maintient une décharge électrique dans le récipient à décharge (20) et induit un gradient de potentiel dans l'enroulement secondaire (34) dans une direction s'étendant à partir de sa première extrémité (37a) vers sa deuxième extrémité (37b), ledit gradient est dirigé d'une manière opposée vers le gradient de potentiel à partir de la première (36a) vers la deuxième extrémité (36b) dans l'enroulement primaire (33),
    caractérisée en ce que dans une première partie terminale (39a) de la bobine (30) qui comporte le demi-nombre de la somme des spires Np+Ns des enroulements primaire et secondaire les enroulements primaire et secondaire (33, 34) présentent Npl spires respectivement Nsl spires où (Np1/Np) ≥ (3/2)*(Ns1/Ns).
  7. Lampe à décharge sans électrode selon la revendication 6, caractérisée en ce que les enroulements primaire (33) et secondaire (34) présentent la même direction d'enroulement.
  8. Lampe à décharge sans électrode selon la revendication 7, caractérisée en ce que la direction s'étendant à partir de la première partie terminale (39a) vers l'autre partie terminale (39b) correspond à la direction s'étendant à partir de la première (37a) vers la deuxième extrémité (37b) de l'enroulement secondaire (34).
  9. Lampe à décharge sans électrode selon la revendication 6, 7 ou 8, caractérisée en ce qu'au moins un quatrième du nombre de spires (31, 32) de chaque enroulement (33, 34) s'étend longitudinalement dans la direction longitudinale de la bobine au-delà de l'autre enroulement (34 respectivement 33).
  10. Lampe à décharge sans électrode selon l'une quelconque des revendications 6 à 9, caractérisée en ce que la bobine (30) est encapsulée dans une substance élastique (40).
EP19930202877 1992-10-21 1993-10-13 Ensemble d'illumination et lampe à décharge basse pression sans électrode apte à l'utilisation dans cet ensemble Expired - Lifetime EP0594245B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP19930202877 EP0594245B1 (fr) 1992-10-21 1993-10-13 Ensemble d'illumination et lampe à décharge basse pression sans électrode apte à l'utilisation dans cet ensemble

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
EP92203222 1992-10-21
EP92203222 1992-10-21
EP19930202877 EP0594245B1 (fr) 1992-10-21 1993-10-13 Ensemble d'illumination et lampe à décharge basse pression sans électrode apte à l'utilisation dans cet ensemble

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EP0594245A1 EP0594245A1 (fr) 1994-04-27
EP0594245B1 true EP0594245B1 (fr) 1997-09-17

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Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1996013053A2 (fr) * 1994-10-19 1996-05-02 Philips Electronics N.V. Ensemble d'eclairage, lampe a decharge a basse pression depourvue d'electrodes et enceinte de decharge pour ensemble d'eclairage
US5866991A (en) * 1996-07-17 1999-02-02 General Electric Company Induction lamp with oppositely oriented coil winding layers
US7180230B2 (en) * 2004-04-16 2007-02-20 Osram Sylvania Inc. RF induction lamp with reduced electromagnetic interference

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5539134A (en) * 1978-09-11 1980-03-18 Mitsubishi Electric Corp No-electrode fluorescent lamp device
NL8800584A (nl) * 1988-03-09 1989-10-02 Philips Nv Elektrodeloze lagedrukontladingslamp.

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EP0594245A1 (fr) 1994-04-27

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