EP0572585B1 - Vorrichtung zum betreiben einer gasentladungslampe - Google Patents

Vorrichtung zum betreiben einer gasentladungslampe Download PDF

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Publication number
EP0572585B1
EP0572585B1 EP92923352A EP92923352A EP0572585B1 EP 0572585 B1 EP0572585 B1 EP 0572585B1 EP 92923352 A EP92923352 A EP 92923352A EP 92923352 A EP92923352 A EP 92923352A EP 0572585 B1 EP0572585 B1 EP 0572585B1
Authority
EP
European Patent Office
Prior art keywords
lamp
voltage converter
connection
voltage
output
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
EP92923352A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0572585A1 (de
Inventor
Ingo Gorille
Ulrich Drews
Wolfgang Jacob
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.)
Robert Bosch GmbH
Original Assignee
Robert Bosch GmbH
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 Robert Bosch GmbH filed Critical Robert Bosch GmbH
Publication of EP0572585A1 publication Critical patent/EP0572585A1/de
Application granted granted Critical
Publication of EP0572585B1 publication Critical patent/EP0572585B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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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
    • H05B41/00—Circuit arrangements or apparatus for igniting or operating discharge lamps
    • H05B41/14—Circuit arrangements
    • H05B41/26—Circuit arrangements in which the lamp is fed by power derived from dc by means of a converter, e.g. by high-voltage dc
    • H05B41/28—Circuit arrangements in which the lamp is fed by power derived from dc by means of a converter, e.g. by high-voltage dc using static converters
    • H05B41/288—Circuit arrangements in which the lamp is fed by power derived from dc by means of a converter, e.g. by high-voltage dc using static converters with semiconductor devices and specially adapted for lamps without preheating electrodes, e.g. for high-intensity discharge lamps, high-pressure mercury or sodium lamps or low-pressure sodium lamps
    • H05B41/292—Arrangements for protecting lamps or circuits against abnormal operating conditions
    • H05B41/2928—Arrangements for protecting lamps or circuits against abnormal operating conditions for protecting the lamp against abnormal operating conditions
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S315/00—Electric lamp and discharge devices: systems
    • Y10S315/05—Starting and operating circuit for fluorescent lamp
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S315/00—Electric lamp and discharge devices: systems
    • Y10S315/07—Starting and control circuits for gas discharge lamp using transistors

Definitions

  • the invention relates to a device for operating a gas discharge lamp according to the preamble of the main claim.
  • An electronic ballast for operating a gas discharge lamp is known from the specialist magazine ELEKTOR, number 6, 1988, "Fluorescent lamp electronics", pages 14-19.
  • the ballast contains a voltage converter which converts a given input voltage, here for example the mains voltage, into a given AC output voltage.
  • a bridge circuit is connected, which is designed as a half bridge, in the diagonal of which the gas discharge lamp is arranged.
  • the voltage converter contains a transformer that ensures electrical isolation between the input-side mains voltage and the bridge circuit. Due to an unavoidable stray capacitance between the gas discharge lamp and parts arranged adjacent to the lamp, such as a lamp, for example, an average potential of zero volts will result between the lamp and the parts.
  • the invention has for its object to provide a device for operating a gas discharge lamp, which enables a long service life of the gas discharge lamp.
  • the device according to the invention is based on the knowledge that an average potential of zero volts between the lamp and at least one part arranged adjacent to the lamp, which can carry an electrical potential, is not sufficient in all cases, to reliably prevent unwanted ion migration, in particular diffusion of ions into the lamp body.
  • a part is, for example, a lamp holder or a lamp in which the lamp is installed.
  • the part is not limited to the lamp.
  • the part can generally be a part in the vicinity of the lamp, it being essential that this part can carry an electrical potential so that an electric field can occur between the lamp and the part. It is therefore not necessary for the part to be electrically conductive. Charge balancing only has to take place.
  • a particularly simple implementation of the voltage converter is possible with an inverse converter, in which the negative pole of an input DC voltage source is connected to that connection of the output at which the positive potential occurs.
  • This configuration is particularly advantageous when the negative pole of the input DC voltage source is connected to an electrical device ground, because often the part adjacent to the lamp is also connected to the device ground. In relation to the negative output voltage of the inverse converter, the part lying on the circuit ground then always has a positive potential.
  • Another advantageous embodiment provides for the implementation of the voltage converter as a converter with an isolating transformer.
  • the electrical isolation between the input DC voltage source and the bridge circuit enables the part adjacent to the lamp to be connected easily to the positive connection at the output of the voltage converter.
  • the device according to the invention is particularly suitable for operating high-pressure gas discharge lamps which are arranged in a motor vehicle headlight.
  • FIG. 1 shows an electronic ballast for a gas discharge lamp with a simple voltage converter without potential isolation
  • FIG. 2 shows an embodiment with an inverse converter without potential isolation
  • FIG. 3 shows an exemplary embodiment with a voltage converter with transformer potential isolation.
  • FIG. 1 shows a gas discharge lamp 10 which is arranged in a diagonal 11 of a bridge circuit 12.
  • the bridge 12 contains two switching means 13, 14; 15, 16, wherein the series connections are each connected between a first and second bridge input line 17, 18.
  • the bridge diagonal 11 lies between a connection of the switching means 13, 14 of the one series connection and the connection of the switching means 15, 15 of the other series connection.
  • the electronic ballast contains a voltage converter 19, which converts a given input voltage into a predetermined voltage occurring at the output 20 of the converter 19.
  • a battery is provided as an example of an input voltage source 21, the positive pole 22 of which is connected to a coil 23.
  • a voltage converter switching means 25 is present between another connection of the coil 23 and the negative pole 24 of the battery 21.
  • the anode connection of a diode 26 is located at the connection between the coil 23 and the voltage converter switching means 25.
  • the cathode of the diode 26 is connected to a first connection 27 at the output 20 of the voltage converter 19.
  • a positive potential occurs at the first connection 27 in comparison to a second connection 28 at the output 20 of the voltage converter 19.
  • the second connection 28 is connected both to the negative pole 24 of the battery 21 and to the voltage converter switching means 25.
  • a smoothing capacitor 29 is located between the first and the second connection 27, 28 at the output 20 of the voltage converter 19.
  • the first connection 27 at the output 20 is connected to the first bridge input line 17 and the second connection at the output 20 is connected to the second bridge input line 18.
  • a control circuit 30 is provided, which emits corresponding control signals.
  • the control circuit 30 is connected to the first terminal 27.
  • a part 31 adjacent to the lamp 10 is connected, which can carry an electrical potential and which is arranged such that between the lamp 10 and the part 31 electric field 32 can occur.
  • the potential of the part 31 is always positive compared to the potential occurring on the lamp 10.
  • FIG. 2 those parts that functionally correspond to the parts shown in FIG. 1 are each given the same reference numerals.
  • the arrangement of the coil 23 is interchanged with that of the voltage converter switching means 25.
  • the switching means 25 is therefore directly on the positive pole 22 of the battery 21, while the coil 23 is on the other terminal of the switching means 25 and leads from there to the negative pole 24 of the battery.
  • the connection of the diode 26 has also changed, whose anode in FIG. 2 lies at the first connection 27 of the output 20 of the voltage converter 19. If the capacitor 29 is a capacitor with a predetermined polarity, its connections in FIG. 2 must be interchanged with FIG.
  • the part 31 is connected in FIG. 2 to the second connection 28 of the output 20 of the voltage converter 19.
  • the second connection 28 has a positive potential with respect to the first connection 27.
  • the second connection 28 is connected to the negative pole 24 of the battery 21, which is simultaneously connected to a device ground 33.
  • FIG. 3 shows a further exemplary embodiment of an electronic ballast which differs from the circuit diagrams shown in FIGS. 1 and 2 in the configuration of the voltage converter 19.
  • Those parts shown in FIG. 3 that correspond to the parts shown in FIGS. 1 and 2 are given the same reference numerals in FIG. 3.
  • an isolating transformer 34 is present in FIG. 3, the primary winding 35 of which is connected on the one hand to the positive pole 22 of the battery 21 and on the other hand to the voltage converter switching means 25.
  • the switching means 25 is connected to the negative pole 24 of the battery 21, which is connected to the device ground 33.
  • a secondary winding 36 of the transformer 34 is connected on the one hand via the diode 26 to the first connection 27 and on the other hand directly to the second connection 28 at the output 20 of the voltage converter 19.
  • the cathode of the diode 26 is at the first terminal 27. With this polarity of the diode 26, the positive potential with respect to the second terminal 28 is at the first terminal 27 of the output 20.
  • the part 31 is connected to the first terminal 27.
  • the device according to the invention according to FIG. 1 works as follows:
  • the voltage converter 19 transforms the voltage of the source 21 into a voltage required to operate the gas discharge lamp 10.
  • the voltage converter 19 outputs a DC voltage at its output 20.
  • a (mains) alternating voltage is provided as source 21, which is first rectified before it is fed to the voltage converter.
  • the battery shown in the figures can also be provided as the source 21, for example, which has a given direct voltage.
  • the operation of both the voltage converter 19 shown in FIG. 1 and the configurations shown in the other two figures is based on the prior art mentioned at the outset, the technical book by U. TIETZE and CH. SCHENK, "Semiconductor Circuit Technology" referenced.
  • the inductance of the coil 23 and the capacitance of the capacitor 29 can be determined from the formulas in the specified literature.
  • the output voltage can essentially be determined by the ratio of the switched-on to the switched-off state of the voltage converter switching means 25, which receives the corresponding switch-on signals from the control circuit 13. The ratio determines the control circuit as a function of the output voltage of the voltage converter 19 occurring at the first connection 27.
  • the bridge circuit 12 is designed as an H bridge, in which two switching means 13, 14; 15, 16 are connected in series between the two bridge input lines 17, 18.
  • the switching means 13, 14; 15, 16, as well as the voltage converter switching means 25, are, for example, switching transistors, preferably field-effect transistors.
  • the lamp 10 is connected in the bridge diagonal 11, which lies between the two connecting lines of the one switching means 13, 14 and the other switching means 15, 16. Through a time control of the switching means 13, 14; 15, 16, the lamp 10 is operated with an alternating voltage, which the DC voltage at the output 20 of the voltage converter 19 is derived.
  • FIG. 1 shows the state in which the switching means 14, 15 are closed while the switching means 13, 16 are open. In the next cycle, the switching means 14, 15 are opened and the switching means 13, 16 are closed. In the control, care must be taken that the current flowing through the lamp 10 is free of mean values. This is achieved in that the switching times for the switching means 13, 14; 15, 16 are each of the same length.
  • a half-bridge circuit is also suitable, in which two switching means, which are connected in series, are each replaced by capacitors. Further components required for the operation of the lamp 10, for example for limiting the current flowing through the lamp 10 or for igniting the lamp 10, are not shown in the figures, since they are of secondary importance for the present invention.
  • the part 31 is, for example, a lamp holder or a lamp in which the lamp 10 is installed. If the lamp is made entirely of plastic, other parts outside the lamp can act as part 31.
  • an electric field 32 which has the mean value zero, will build up between the lamp 10 and an adjacent part 31 due to the stray capacitance mentioned.
  • This assumption is valid on the condition that the part 31 has no conductive connection to any circuit point of the circuit arrangement shown in FIG.
  • the part 31 is connected to the terminal 27 at the output 20 of the voltage converter 19, which has a positive potential with respect to the other terminal 28. This measure ensures that the mean potential at the lamp 10 is always negative compared to the positive potential of the part 31.
  • part 31 cannot be connected to first connection 27 at output 20 of voltage converter 19 become.
  • the configuration of the voltage converter 19 shown in FIG. 2 is particularly advantageously suitable.
  • a pole 22, 24 of the source 21, in the example the negative pole 24, is connected to the electrical device ground 33, which is also connected to the part 31.
  • the voltage converter 19 is implemented as an inverse converter, in which the polarity of an input voltage is converted into a reverse polarity at the output 20 of the converter 19.
  • the connection shown in FIG. 2 between the part 31 and the second connection 28 can already be provided during the implementation without the need for an additional connection. This is particularly the case if the part 31 is a lamp holder, a lamp or at least another part 31 connected to the electrical device mass 33.
  • the configuration of the voltage converter 19 shown in FIG. 3 has the advantage of potential isolation between the source 21 and the output 20 of the converter 19. This advantage is made possible by the isolating transformer 34.
  • a flyback converter circuit is shown as an example in FIG.
  • the particular advantage of the transformer isolation is that the part 31, regardless of whether it is connected to the electrical device ground 33 or an operating earth, can always be connected in a simple manner to the connection 27, 28 at the output 20 of the voltage converter 19, which has the positive potential with respect to the other terminal 27, 28.

Landscapes

  • Circuit Arrangements For Discharge Lamps (AREA)
  • Dc-Dc Converters (AREA)
EP92923352A 1991-12-18 1992-11-13 Vorrichtung zum betreiben einer gasentladungslampe Expired - Lifetime EP0572585B1 (de)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE4141804 1991-12-18
DE4141804A DE4141804C1 (xx) 1991-12-18 1991-12-18
PCT/DE1992/000946 WO1993012630A1 (de) 1991-12-18 1992-11-13 Vorrichtung zum betreiben einer gasentladungslampe

Publications (2)

Publication Number Publication Date
EP0572585A1 EP0572585A1 (de) 1993-12-08
EP0572585B1 true EP0572585B1 (de) 1996-03-06

Family

ID=6447383

Family Applications (1)

Application Number Title Priority Date Filing Date
EP92923352A Expired - Lifetime EP0572585B1 (de) 1991-12-18 1992-11-13 Vorrichtung zum betreiben einer gasentladungslampe

Country Status (6)

Country Link
US (1) US5397965A (xx)
EP (1) EP0572585B1 (xx)
JP (1) JPH06505594A (xx)
DE (2) DE4141804C1 (xx)
ES (1) ES2085047T3 (xx)
WO (1) WO1993012630A1 (xx)

Families Citing this family (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4224996A1 (de) * 1992-07-29 1994-02-03 Hella Kg Hueck & Co Vorschaltgerät zum Betreiben von Hochdruck-Gasentladungslampen mit niederfrequenter, rechteckförmiger Spannung in Kraftfahrzeugen
DE4342590A1 (de) * 1993-12-14 1995-06-22 Bosch Gmbh Robert Getaktete Stromversorgung
IT1268065B1 (it) * 1994-05-24 1997-02-20 Marelli Autronica Circuito alimentatore di potenza, particolarmente per autoveicoli.
US5583398A (en) * 1994-09-15 1996-12-10 Magnetek, Inc. Powerfactor correcting flyback arrangement having a resonant capacitor element connected across the switching element
US5955846A (en) * 1995-03-15 1999-09-21 Matsushita Electric Industrial Co., Ltd. Discharge lamp lighting device and a method for lighting a discharge lamp
DE69616495T2 (de) 1995-07-05 2002-06-13 Koninkl Philips Electronics Nv Schaltungsanordnung
JP3759996B2 (ja) * 1996-01-08 2006-03-29 株式会社小糸製作所 放電灯点灯回路
JPH09266080A (ja) * 1996-03-29 1997-10-07 Matsushita Electric Works Ltd 光源点灯装置
DE19646861C1 (de) * 1996-11-13 1998-04-16 Bosch Gmbh Robert Vorrichtung zum Betreiben einer Gasentladungslampe
US6031740A (en) * 1998-07-03 2000-02-29 Endress + Hauser Flowtec Ag Method of regulating the coil current of electromagnetic flow sensors
JP2003017283A (ja) * 2001-06-29 2003-01-17 Ushio Inc 光源装置
US6731075B2 (en) 2001-11-02 2004-05-04 Ampr Llc Method and apparatus for lighting a discharge lamp

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3909666A (en) * 1973-12-26 1975-09-30 Stanley N Tenen Ballast circuit for gaseous discharge lamps
FR2416617A1 (fr) * 1978-02-07 1979-08-31 Signaux Entr Electriques Convertisseur pour l'alimentation de lampes a decharge, et plus generalement de lampes a arc, et son application aux projecteurs pour de telles lampes
US4200823A (en) * 1978-03-15 1980-04-29 Safety Products Strobe lamp warning apparatus
CA1060946A (fr) * 1978-04-26 1979-08-21 Hydro-Quebec Balises stroboscopiques alimentees par une source capacitive
NL8800015A (nl) * 1988-01-06 1989-08-01 Philips Nv Elektrische inrichting voor het ontsteken en voeden van een gasontladingslamp.
EP0477621B1 (en) * 1990-09-07 1995-11-29 Matsushita Electric Industrial Co., Ltd. A lighting device of discharge lamp

Also Published As

Publication number Publication date
DE4141804C1 (xx) 1993-02-25
DE59205609D1 (de) 1996-04-11
WO1993012630A1 (de) 1993-06-24
JPH06505594A (ja) 1994-06-23
ES2085047T3 (es) 1996-05-16
US5397965A (en) 1995-03-14
EP0572585A1 (de) 1993-12-08

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