EP0594245B1 - Beleuchtungseinheit und elektrodenlose Niederdruck-Entladungslampe zur Anwendung in einer solchen Beleuchtungseinheit - Google Patents

Beleuchtungseinheit und elektrodenlose Niederdruck-Entladungslampe zur Anwendung in einer solchen Beleuchtungseinheit 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
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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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EP19930202877
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English (en)
French (fr)
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EP0594245A1 (de
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/de
Publication of EP0594245A1 publication Critical patent/EP0594245A1/de
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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)
  • Circuit Arrangements For Discharge Lamps (AREA)
  • Non-Portable Lighting Devices Or Systems Thereof (AREA)
  • Discharge Lamps And Accessories Thereof (AREA)

Claims (10)

  1. Beleuchtungseinheit mit einer elektrodenlosen Niederdruck-Entladungslampe (10) und einer hochfrequenten elektrischen Stromversorgungseinrichtung (50), wobei die Lampe (10) mit einem gasdicht verschlossenen Entladungsgefäß (20) versehen ist, das eine ionisierbare Füllung (21) enthält und mit einer Spule (30) mit Np Windungen (31, 32) einer Primärwicklung und Ns Np Windungen einer Sekundärwicklung (33 bzw. 34), welche Stromversorgungseinrichtung (50) mit Eingangsklemmen (51a, 51b), mit einer Ausgangsklemme (52a), die bezüglich Masse (M) elektrisch neutral ist und die mit einem ersten Ende (36a) der Primärwicklung (33) elektrisch verbunden ist, und mit einer weiteren Ausgangsklemme (52b), die mit einem zweiten Ende (36b) der Primärwicklung (33) elektrisch verbunden ist, versehen ist, wobei in einem Nennbetriebszustand von der Primärwicklung (33) ein hochfrequentes Magnetfeld generiert wird, das eine elektrische Entladung in dem Entladungsgefäß (20) aufrechterhält und in der Sekundärwicklung (34) in einer Richtung von einem ersten, bezüglich Masse (M) elektrisch neutralen Ende (37a) zu einem zweiten, freien Ende (37b) einen Potentialgradienten induziert, der dem Potentialgradienten vom ersten (36a) zum zweiten Ende (36b) in der Primärwicklung (33) entgegengesetzt gerichtet ist,
    dadurch gekennzeichnet, daß
    die erste Primärwicklung und die zweite Sekundärwicklung (33, 34) in einem ersten Endabschnitt (39a) der Spule (30), der die Hälfte der Summe der Windungen Np+Ns der ersten Primärwicklung und der zweiten Sekundärwicklung umfaßt, Npl bzw. Nsl Windungen haben, wobei (Np1/Np) ≥ (3/2)·(Ns1/Ns) ist.
  2. Beleuchtungseinheit nach Anspruch 1, dadurch gekennzeichnet, daß die Primär- (33) und die Sekundärwicklung (34) die gleiche Wickelrichtung haben.
  3. Beleuchtungseinheit nach Anspruch 2, dadurch gekennzeichnet, daß die Richtung vom ersten Endabschnitt (39a) zum anderen Endabschnitt (39b) der Richtung vom ersten (37a) zum zweiten Ende (37b) der Sekundärwicklung (34) entspricht.
  4. Beleuchtungseinheit nach Anspruch 1, 2 oder 3, dadurch gekennzeichnet, daß sich zumindest ein Viertel der Windungen (31, 32) jeder Wicklung (33, 34) longitudinal, in Längsrichtung der Spule, bis über die andere Wicklung (34 bzw. 33) hinaus erstrecken.
  5. Beleuchtungseinheit nach einem der Ansprüche 1 bis 4, dadurch gekennzeichnet, daß die Spule (30) in einer elastischen Substanz (40) eingekapselt ist.
  6. Elektrodenlose Niederdruck-Entladungslampe (10) zur Verwendung in einer Beleuchtungseinheit nach einem der Ansprüche 1 bis 5, versehen mit einem gasdicht verschlossenen Entladungsgefäß (20), das eine ionisierbare Füllung (21) enthält und mit einer Spule (30) mit Np Windungen (31, 32) einer Primärwicklung und Ns Windungen einer Sekundärwicklung (33 bzw. 34), wobei die Primärwicklung (33) ein erstes Ende (36a) hat, das eingerichtet ist, um mit einer Ausgangsklemme (52a) einer hochfrequenten elektrischen Stromversorgungseinrichtung (50), die bezüglich Masse (M) elektrisch neutral ist, elektrisch verbunden zu werden, und ein zweites Ende (36b), das eingerichtet ist, um mit einer weiteren Ausgangsklemme (52b) der Stromversorgungseinrichtung (50) elektrisch verbunden zu werden, wobei die Sekundärwicklung (34) ein erstes Ende (37a) hat, das eingerichtet ist, um mit der Ausgangsklemme (52a) der Stromversorgungseinrichtung (50), die bezüglich Masse (M) elektrisch neutral ist, verbunden zu werden, und ein zweites, freies Ende (37b), so daß in einem Nennbetriebszustand von der Primärwicklung (33) ein hochfrequentes Magnetfeld generiert wird, das eine elektrische Entladung in dem Entladungsgefäß (20) aufrechterhält und in der Sekundärwicklung (34) in einer Richtung von ihrem ersten Ende (37a) zu ihrem zweiten Ende (37b) einen Potentialgradienten induziert, der dem Potentialgradienten vom ersten (36a) zum zweiten Ende (36b) in der Primärwicklung (33) entgegengesetzt gerichtet ist,
    dadurch gekennzeichnet, daß
    die erste Primärwicklung und die zweite Sekundärwicklung (33, 34) in einem ersten Endabschnitt (39a) der Spule (30), der die Hälfte der Summe der Windungen Np+Ns der ersten Primäwicklung und der zweiten Sekundärwicklung umfaßt, Npl bzw. Nsl Windungen haben, wobei (Np1/Np) ≥ (3/2)·(Ns1/Ns) ist.
  7. Elektrodenlose Niederdruck-Entladungslampe (10) nach Anspruch 6, dadurch gekennzeichnet, daß die Primär- (33) und die Sekundärwicklung (34) die gleiche Wickelrichtung haben.
  8. Elektrodenlose Niederdruck-Entladungslampe (10) nach Anspruch 6 oder 7, dadurch gekennzeichnet, daß die Richtung vom ersten Endabschnitt (39a) zum anderen Endabschnitt (39b) der Richtung vom ersten (37a) zum zweiten Ende (37b) der Sekundärwicklung (34) entspricht.
  9. Elektrodenlose Niederdruck-Entladungslampe (10) nach Anspruch 6, 7 oder 8 9, dadurch gekennzeichnet, daß sich zumindest ein Viertel der Windungen (31, 32) jeder Wicklung (33, 34) longitudinal, in Längsrichtung der Spule, bis über die andere Wicklung (34 bzw. 33) hinaus erstrecken.
  10. Elektrodenlose Niederdruck-Entladungslampe (10) nach einem der Ansprüche 6 bis 9, dadurch gekennzeichnet, daß die Spule (30) in einer elastischen Substanz (40) eingekapselt ist.
EP19930202877 1992-10-21 1993-10-13 Beleuchtungseinheit und elektrodenlose Niederdruck-Entladungslampe zur Anwendung in einer solchen Beleuchtungseinheit Expired - Lifetime EP0594245B1 (de)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP19930202877 EP0594245B1 (de) 1992-10-21 1993-10-13 Beleuchtungseinheit und elektrodenlose Niederdruck-Entladungslampe zur Anwendung in einer solchen Beleuchtungseinheit

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
EP92203222 1992-10-21
EP92203222 1992-10-21
EP19930202877 EP0594245B1 (de) 1992-10-21 1993-10-13 Beleuchtungseinheit und elektrodenlose Niederdruck-Entladungslampe zur Anwendung in einer solchen Beleuchtungseinheit

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

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EP19930202877 Expired - Lifetime EP0594245B1 (de) 1992-10-21 1993-10-13 Beleuchtungseinheit und elektrodenlose Niederdruck-Entladungslampe zur Anwendung in einer solchen Beleuchtungseinheit

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Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0734585B1 (de) * 1994-10-19 1999-02-24 Koninklijke Philips Electronics N.V. Beleuchtungsvorrichtung, elektrodenlose niederdruckentladungslampe und entladungsgefäss dafür
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

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* 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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