EP2119323B1 - Zündtransformator für eine entladungslampe - Google Patents

Zündtransformator für eine entladungslampe Download PDF

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Publication number
EP2119323B1
EP2119323B1 EP08708820A EP08708820A EP2119323B1 EP 2119323 B1 EP2119323 B1 EP 2119323B1 EP 08708820 A EP08708820 A EP 08708820A EP 08708820 A EP08708820 A EP 08708820A EP 2119323 B1 EP2119323 B1 EP 2119323B1
Authority
EP
European Patent Office
Prior art keywords
ignition
transformer
ignition transformer
lamp
discharge lamp
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.)
Not-in-force
Application number
EP08708820A
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German (de)
English (en)
French (fr)
Other versions
EP2119323A1 (de
Inventor
Bernhard Siessegger
Manfred RÖHL
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.)
Osram GmbH
Original Assignee
Osram GmbH
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Filing date
Publication date
Application filed by Osram GmbH filed Critical Osram GmbH
Publication of EP2119323A1 publication Critical patent/EP2119323A1/de
Application granted granted Critical
Publication of EP2119323B1 publication Critical patent/EP2119323B1/de
Not-in-force legal-status Critical Current
Anticipated expiration legal-status Critical

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    • 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
    • H05B41/02—Details
    • H05B41/04—Starting switches

Definitions

  • the invention is based on an ignition transformer for igniting a discharge lamp, preferably high-pressure gas discharge lamp, by means of pulse ignition, whereby after the ignition a high-frequency lamp operation takes place on an electronic ballast.
  • One in the publication WO2005 / 011338 reproduced circuit arrangement for a high-pressure discharge lamp has an operating part with a DC voltage source and an ignition part with pulse source and a mercury-free metal halide high-pressure discharge lamp.
  • the discharge lamp and a secondary winding of an ignition transformer are connected in series.
  • the primary winding of the ignition transformer is controlled by a pulse source.
  • a particularly low-loss material is preferred.
  • this secondary winding Since the lamp current flows through the secondary winding during operation of the discharge lamp, this secondary winding has an unwanted inductance during lamp operation.
  • a partial compensation of the inductance of the secondary winding can be achieved according to the above-mentioned document be connected in series with the secondary winding, a capacitor.
  • Patent JP 2005340060 (Toshiba) describes a transformer for filament heating, wherein the transformer core is formed so that the Curie temperature is reached after the ignition of the lamp.
  • the object of the present invention is to provide an ignition transformer for a discharge lamp, in which the losses during high-frequency lamp operation are reduced and a low circuit complexity is required, as well as to provide a compact lamp cap.
  • an ignition transformer for a discharge lamp is provided with a transformer core whose material, power and structure are chosen in such a way that the Curie temperature of the material can be achieved by a voltage drop across a secondary winding of the ignition transformer after the ignition caused by the ignition transformer , The heating up to the ignition temperature takes place with the at the secondary winding applied energy, wherein after reaching the Curie temperature, the secondary winding of the ignition transformer is practically ineffective and only a small power and absorption from the lamp circuit is necessary to keep the transformer core to the Curie temperature.
  • the material of the transformer core has a Curie temperature in the range of 60 ° C to 400 ° C, especially between 100 ° C and 220 ° C, thereby overheating the transformer core possibly due to materials in the environment the transformer core could have a negative impact is avoided.
  • the Curie temperature in the range between 100 ° C and 220 ° C is preferred, since with increasing Curie temperature, the efficiency decreases due to heat losses, on the other hand, the Curie temperature must be above the ambient temperature in any case to ensure proper functioning can.
  • the transformer core is preferably configured such that the magnetic length and the magnetic effective cross-section of the transformer core are minimized in such a way that sufficient magnetic ignition between the primary and secondary windings for ignition in the cold state of the ignition transformer.
  • a quick ignition can take place while the secondary winding is virtually ineffective during lamp operation.
  • the transformer core has a ring shape, since with a high-frequency lamp current less electromagnetic interference than an open geometry such as a rod core.
  • the ignition transformer is formed thermally isolated to keep the transformer core at a lower power to be supplied and thus higher efficiency of the entire assembly to Curie temperature and to make the secondary winding virtually ineffective.
  • the transformer core is preferably encapsulated for thermal and electrical insulation, whereby this can be produced economically favorable.
  • the transformer core may be provided in a sealed housing, thereby preventing the convection of air and the associated increased cooling.
  • the ignition transformer is provided in particular for a high-pressure discharge lamp.
  • a compact design with good luminous efficacy can be achieved especially in automotive headlamps.
  • a lamp cap for a discharge lamp is provided with an ignition transformer having the properties described above, wherein due to the small volume of the transformer core, a compact design of the lamp assembly can be implemented.
  • the discharge vessel of the lamp is provided in the hole of the ignition transformer in the lamp base at least partially protruding.
  • the large axial dimension of the discharge lamps can be to provide the transformer core in the vicinity of the discharge vessel of the discharge lamp.
  • FIG. 1 A circuit arrangement 1 with ignition transformer 2 according to the present invention is shown in FIG FIG. 1 shown.
  • a primary winding 4 of the ignition transformer 2 is fed by a pulse source 6 and an ignition voltage U2.
  • the secondary winding 8 of the ignition transformer 2 is connected in series with the discharge lamp 10 and is fed by an operating voltage U Q.
  • the discharge lamp used is preferably a high-pressure gas discharge lamp, for example a mercury-containing metal halide lamp of the "OSRAM HQI" type.
  • FIG. 2 a discharge lamp 10 is shown in a lamp cap 12.
  • the lamp cap 12 has the Impulsqüelle 6, through which the primary winding 4 of the ignition transformer 2 is fed.
  • the ignition transformer 2 is, as in FIG. 2 shown, preferably annular and has a transformer core 14, as in FIG. 3 shown has an air gap 15. On the transformer core 14, the secondary winding 8 is applied, which is surrounded by the primary winding 4.
  • a terminal 16 of the discharge lamp 10 is connected to one end of the secondary winding 8, while another terminal 18 of the discharge lamp 10 is supplied with the operating voltage U Q via the lamp cap.
  • the pulse source 6 is supplied with the ignition voltage U2.
  • the lamp base 12 is preferably filled with a potting compound, such as silicone, so that a high voltage insulation is present around the ignition transformer and at the same time a thermal insulation of the transformer core 14 is provided. It is a casting with a foam structure or a hollow body filling conceivable. Alternatively, the core may be provided in a sealed housing, which prevents convection of the air and thus prevents cooling.
  • the connections for the ignition voltage U2 and the operating voltage Ü Q are led out of the lamp base as electrical connections to the operating device.
  • the discharge vessel 20 of the discharge lamp 10 is immersed in a central hole in the ignition transformer 2, whereby, as already in the published patent application DE 19610385 set out, a small-volume gas discharge lamp with short power supplies can be implemented in an integrated design. In addition to the advantageous compact design losses in the ignition voltage can be kept low due to this compact design.
  • FIG. 3 the exemplary perspective view of the transformer core 14 is shown with an air gap 15.
  • the core material used is a ferrite.
  • material N30 from manufacturer Epcos having an outer diameter of 25mm, an inner diameter of 15mm, a height of 3.8mm and an air gap of 3.5mm is used.
  • the material for the transformer core is chosen in such a way that the Curie temperature directly after ignition is achieved by utilizing a portion of the energy provided by the transducer to heat the transformer core.
  • the secondary winding of the transformer is substantially ineffective, but low power absorption from the lamp circuit is required to maintain the transformer core or parts of the transformer core at the Curie temperature.
  • a Curie temperature is preferably sought in the range between 60 ° C and 400 ° C of the material, since from the viewpoint of the prior art due to poor ferrite properties of the desired effect in the secondary winding already occurs at an early stage ,
  • the transformer core is to be chosen so large that the transformer can perform its functions, ie in the cold state allows sufficient magnetic coupling between the primary and the secondary winding.
  • core form is particularly the in FIG. 3 shown ring shape, since at such a temperature and high-frequency lamp currents less electromagnetic interference than in a rod core caused, which occurs especially at temperatures near or at the Curie temperature.
  • FIG. 4 It can be seen that the permeability reaches a value of about 1 at a temperature of about 143 ° C, the Curie temperature, with the core material N30 used. If now, during operation after ignition, the temperature of the transformer core is kept close to 143 ° C or slightly above that temperature, the transformer core loses its ferrimagnetic properties and shows only paramagnetic properties, whereby the secondary winding is effectively ineffective.
  • a transformer core made from the material N30 as described above is used.
  • FIG. 5 shows a pulse source 26 according to the first embodiment, instead of the pulse source 6 from FIG. 1 is used.
  • the secondary winding 8 has 30 turns of Teflon-insulated wire and has an impedance of 39 ⁇ H at 20 ° C.
  • the primary winding has two turns. The middle turns of both the primary winding 4 and the secondary winding 8 are arranged on the transformer core 14 with respect to the air gap.
  • the transformer core is insulated by vacuum encapsulation by means of silicone heat and high voltage.
  • the primary winding 4 is connected in series via a resistor 28 of 100 k ⁇ and a spark gap 30 with a switching voltage of 2 kV.
  • a capacitor 32 of 27nF is connected in parallel via the resistor 28 to the ignition voltage U2.
  • the ignition voltage U2 is 2.5kV.
  • Discharge lamp 10 is a mercury-containing metal halide lamp of the "OSRAM HQI" type with a nominal power of 35W.
  • FIG. 1 An operation of the discharge lamp 10 via the operating voltage U Q with a frequency of 2 MHz.
  • the discharge lamp 10 is operated with an operating current of 400mA, thereby initially an ohmic-inductive voltage drop across the secondary winding 8 of about 200V occurs. Due to this voltage drop, the transformer core 14 is heated. The lamp voltage is initially 20V.
  • the core temperature reaches a value close to the Curie temperature in the same time range as the ramp-up of the lamp. In practice, this period may be a few seconds to a few minutes. During this time, the lamp voltage increases from initially 20V to 85V. Due to the reduced voltage drop across the secondary winding 8 only a low operating voltage U Q is necessary.
  • a regulation of the lamp power is now carried out by increasing the frequency, for example from 2.5MHz to 3.5MHz.
  • This residual inductance depends on the inductance of the air coil formed by the secondary winding 8, and the temperature conditions during steady-state operation.
  • This residual inductance is preferably adjusted so that the resulting impedance in the range of 1/5 is up to five times the impedance of the discharge lamp.
  • the residual inductance has been 8 ⁇ H. Under the impedance of the discharge lamp should Here, the quotient of the two of the two RMS values of lamp voltage and current at rated power are understood.
  • FIG. 6 a pulse source 46 according to the second embodiment is shown.
  • This pulse source 26 of the first embodiment has a spark gap 50 and a capacitor 52.
  • a resistance comparable to the resistor 28 in the first embodiment is not provided in the second embodiment.
  • the capacitor 52 has a capacitance of 70nF and the spark gap has a switching voltage of 800V.
  • FIG. 7 In the upper diagram, the voltage generated by the secondary winding 8 is shown, while in the lower diagram the voltage across the capacitor 52 can be seen.
  • circuit arrangement according to the first and second embodiments can be achieved for a lamp operation after ignition, a low inductance of the secondary winding and lower losses during operation of the discharge lamp.
  • the discharge lamps are preferably used for video projection, in the motor vehicle headlight and for general lighting. Compared to that in the WO2005 / 011338 In the case of a circuit arrangement for the operation of a discharge lamp according to the present invention, there is no additional component, such as the partial compensation capacitor, for example from this mentioned document necessary. As a result, with the present invention, a good overall efficiency can be achieved in the circuit arrangement.
  • FIG. 8 shows a circuit arrangement 54 according to the third embodiment wherein a symmetrical ignition is realized by the two secondary windings 8a and 8b.
  • a ferrite having a Curie temperature of only about 109 ° C and a maximum initial permeability of only 2500 is used, as opposed to about 143 ° C and 5400 ⁇ m FIG. 4 in the two previous embodiments.
  • a pulse source 56 and a driver 58 which provides the voltages U2 and UQ.
  • the connections for the power supply (eg 12 V DC or 230 V AC are designated 60.
  • the circuit 54 is located in the lamp base
  • the geometric dimensions of the core which has no gap, shows FIG. 9 .
  • the two secondary windings 8a and 8b are wound on the two 30mm long core sides.
  • the primary winding was wound in half over the secondary windings 8a and down on the two long core sides.
  • the transformer is encapsulated in the lamp socket together with the pulse source and the operating device.
  • Parts of the control gear which are particularly hot during operation were thereby be arranged, such as power semiconductors, in close proximity to the ignition transformer to use their waste heat to heat the transformer core can. During operation, therefore, very little energy must be removed from the lamp circuit in order to keep the transformer core close to the Curie temperature.
  • An ignition transformer for a discharge lamp with a transformer core is provided.
  • the material and dimension of the transformer core are selected in such a manner that the Curie temperature of the material after ignition by the ignition transformer is achievable by a voltage drop across a secondary winding of the ignition transformer. In this way, only one residual inductance remains for the secondary winding.
  • a lamp base for a discharge lamp is provided with such an ignition transformer, the discharge vessel of the lamp preferably protruding at least in sections into the center hole of the ignition transformer in the lamp base, resulting in a compact lamp base with discharge lamp.

Landscapes

  • Circuit Arrangements For Discharge Lamps (AREA)
  • Regulation Of General Use Transformers (AREA)
EP08708820A 2007-02-13 2008-02-08 Zündtransformator für eine entladungslampe Not-in-force EP2119323B1 (de)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE102007007128 2007-02-13
DE102007017338A DE102007017338A1 (de) 2007-02-13 2007-04-12 Zündtransformator für eine Entladungslampe
PCT/EP2008/051546 WO2008098881A1 (de) 2007-02-13 2008-02-08 Zündtransformator für eine entladungslampe

Publications (2)

Publication Number Publication Date
EP2119323A1 EP2119323A1 (de) 2009-11-18
EP2119323B1 true EP2119323B1 (de) 2010-06-30

Family

ID=39597698

Family Applications (1)

Application Number Title Priority Date Filing Date
EP08708820A Not-in-force EP2119323B1 (de) 2007-02-13 2008-02-08 Zündtransformator für eine entladungslampe

Country Status (8)

Country Link
US (1) US8339060B2 (zh)
EP (1) EP2119323B1 (zh)
JP (1) JP5069321B2 (zh)
CN (1) CN101578922B (zh)
AT (1) ATE472928T1 (zh)
DE (2) DE102007017338A1 (zh)
TW (1) TW200850069A (zh)
WO (1) WO2008098881A1 (zh)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102007017338A1 (de) 2007-02-13 2008-08-14 Patent-Treuhand-Gesellschaft für elektrische Glühlampen mbH Zündtransformator für eine Entladungslampe
US9640315B2 (en) * 2013-05-13 2017-05-02 General Electric Company Low stray-loss transformers and methods of assembling the same

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4929873A (en) * 1988-06-06 1990-05-29 Powr-Ups Corporation Luminaire system
US4980612A (en) * 1987-04-06 1990-12-25 Lumisistemas, S.A. De C.V. Energy-saving ballast for electric gas discharge lamps

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US4832763A (en) * 1985-10-15 1989-05-23 Westinghouse Electric Corp. Method of stress-relief annealing a magnetic core containing amorphous material
JP2795872B2 (ja) 1989-02-17 1998-09-10 株式会社テック 放電灯点灯装置
JPH03297096A (ja) 1990-04-13 1991-12-27 Tokyo Electric Co Ltd 放電灯点灯装置
JPH0869930A (ja) 1994-08-29 1996-03-12 Matsushita Electric Works Ltd 電磁装置
JPH0869931A (ja) 1994-08-29 1996-03-12 Matsushita Electric Works Ltd 電磁装置
JP3315854B2 (ja) * 1995-02-28 2002-08-19 松下電工株式会社 放電灯点灯装置
US5896013A (en) * 1996-02-12 1999-04-20 Advanced Lighting Technologies, Inc. Operating circuit for an inductively ballasted arc discharge lamp
DE19610385A1 (de) 1996-03-16 1997-09-18 Bosch Gmbh Robert Gasentladungslampe, insbesondere für Kraftfahrzeug-Scheinwerfer
JP3436062B2 (ja) 1997-04-30 2003-08-11 松下電工株式会社 放電灯点灯装置
JPH11185982A (ja) 1997-12-22 1999-07-09 Matsushita Electric Works Ltd 放電灯照明装置
ES2264277T3 (es) * 1998-11-13 2006-12-16 Vacuumschmelze Gmbh Nucleo magnetico adecuado para su uso en un transformador de intesidad, procedimiento para fabricar un nucleo magnetico y transformador de intensidad con un nucleo magnetico.
JP2000286082A (ja) 1999-03-30 2000-10-13 Toshiba Lighting & Technology Corp 放電ランプ点灯装置、始動用昇圧トランスおよび照明装置
JP4355058B2 (ja) 1999-07-27 2009-10-28 日本信号株式会社 電源装置
JP2001257085A (ja) 2000-03-10 2001-09-21 Hitachi Ferrite Electronics Ltd 放電灯起動装置
JP3867488B2 (ja) 2000-09-14 2007-01-10 松下電工株式会社 ランプソケット
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EP1869954A1 (de) * 2005-04-14 2007-12-26 Patent-Treuhand-Gesellschaft für elektrische Glühlampen mbH Vorrichtung zum betreiben oder zünden einer hochdruckentladungslampe, lampensockel und beleuchtungssystem mit einer derartigen vorrichtung sowie verfahren zum betreiben einer hochdruckentladungslampe
DE102006026750A1 (de) * 2006-06-08 2007-12-13 Patent-Treuhand-Gesellschaft für elektrische Glühlampen mbH Hochdruckentladungslampe mit verbesserter Zündfähigkeit sowie Hochspannungspulsgenerator
DE102007017338A1 (de) 2007-02-13 2008-08-14 Patent-Treuhand-Gesellschaft für elektrische Glühlampen mbH Zündtransformator für eine Entladungslampe
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US4929873A (en) * 1988-06-06 1990-05-29 Powr-Ups Corporation Luminaire system

Also Published As

Publication number Publication date
DE502008000877D1 (zh) 2010-08-12
JP2010518650A (ja) 2010-05-27
US8339060B2 (en) 2012-12-25
EP2119323A1 (de) 2009-11-18
CN101578922B (zh) 2012-12-12
WO2008098881A1 (de) 2008-08-21
TW200850069A (en) 2008-12-16
JP5069321B2 (ja) 2012-11-07
ATE472928T1 (de) 2010-07-15
US20100045199A1 (en) 2010-02-25
CN101578922A (zh) 2009-11-11
DE102007017338A1 (de) 2008-08-14

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