EP0055995A1 - Disposition de circuit d'allumage et fonctionnement d'une lampe de décharge à basse pression à partir d'une source de courant continu - Google Patents

Disposition de circuit d'allumage et fonctionnement d'une lampe de décharge à basse pression à partir d'une source de courant continu Download PDF

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Publication number
EP0055995A1
EP0055995A1 EP82200006A EP82200006A EP0055995A1 EP 0055995 A1 EP0055995 A1 EP 0055995A1 EP 82200006 A EP82200006 A EP 82200006A EP 82200006 A EP82200006 A EP 82200006A EP 0055995 A1 EP0055995 A1 EP 0055995A1
Authority
EP
European Patent Office
Prior art keywords
electrode
voltage
lamp
switching element
circuit arrangement
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
Application number
EP82200006A
Other languages
German (de)
English (en)
Other versions
EP0055995B1 (fr
Inventor
Theo Hüsgen
Gerd Dr. Schiefer
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.)
Philips Intellectual Property and Standards GmbH
Koninklijke Philips NV
Original Assignee
Philips Patentverwaltung GmbH
Philips Gloeilampenfabrieken NV
Koninklijke Philips Electronics NV
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 Philips Patentverwaltung GmbH, Philips Gloeilampenfabrieken NV, Koninklijke Philips Electronics NV filed Critical Philips Patentverwaltung GmbH
Publication of EP0055995A1 publication Critical patent/EP0055995A1/fr
Application granted granted Critical
Publication of EP0055995B1 publication Critical patent/EP0055995B1/fr
Expired 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
    • H05B41/02—Details
    • H05B41/04—Starting switches
    • H05B41/042—Starting switches using semiconductor devices
    • H05B41/044—Starting switches using semiconductor devices for lamp provided with pre-heating electrodes
    • H05B41/046—Starting switches using semiconductor devices for lamp provided with pre-heating electrodes using controlled semiconductor devices
    • 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
    • H05B41/16—Circuit arrangements in which the lamp is fed by dc or by low-frequency ac, e.g. by 50 cycles/sec ac, or with network frequencies
    • H05B41/18—Circuit arrangements in which the lamp is fed by dc or by low-frequency ac, e.g. by 50 cycles/sec ac, or with network frequencies having a starting switch

Definitions

  • the invention relates to a circuit arrangement for igniting and operating a low-pressure discharge lamp provided with two electrodes, at least one of which can be preheated, from a direct current source, in which an electronic switching element lying parallel to the lamp and in series with the preheatable electrode (cathode) is reached after it has been reached the ignition temperature of the preheated electrode is switched to its non-conductive state, whereby the heating circuit is interrupted and the full DC voltage is applied to the lamp.
  • the invention is therefore based on the object to provide a circuit arrangement for igniting and operating a low-pressure discharge lamp in which the preheatable electrode can be quickly heated to the predetermined ignition temperature, but shortly before the lamp is ignited, the heating process of this electrode is ended and during the operation of the Lamp also does not start again.
  • unnecessary losses in the heating circuit are to be avoided and, moreover, it is to be ensured that further ignition attempts are made automatically when the lamp is not ignited.
  • the direct current source generates a pulsating direct current and the electronic switching element is switched by a Schmitt trigger which is controlled as a function of the temperature of the preheated electrode and which supplies its supply voltage via a parallel to the preheatable Electrode arranged peak voltage memory, consisting of the series connection of a diode and a charging capacitor, from which the voltage drop across the preheated electrode relates.
  • the peak voltage storage consisting of a diode and a charging capacitor, is provided at the input of the Schmitt trigger.
  • a preferred embodiment of the circuit arrangement according to the invention is characterized in that the control electrode of the electronic switching element via a voltage divider both with the anode of the discharge lamp and with the output of the Schmitt trigger is connected, which is driven by the voltage from the voltage drop across the preheated electrode via a voltage divider consisting of a Zener diode and a resistor and which is parallel to the charging capacitor.
  • the preferred circuit arrangement manages with a relatively small charging capacitor if, according to a development according to the invention, the voltage divider connected to the control electrode of the electronic switching element has a field-effect transistor on the side of the Schmitt trigger, which is caused by the voltage at the output of the Schmitt trigger is controlled.
  • the voltage divider connected to the control electrode of the electronic switching element has a zener diode on the lamp anode side.
  • Schmitt triggers that are coupled back through a resistor are provided.
  • This embodiment is advantageous if individual commercially available Schmitt triggers have too low a hysteresis, as a result of which the difference in control voltages between the breakdown points has become too small for the application in question.
  • Operation with pulsating direct current has the advantage that a thyristor can be used as an electronic switching element.
  • a high-voltage field-effect transistor can be used as a switching element.
  • ballast 5 consists of an ohmic resistor, but preferably an electronic switched-mode power supply, as described, for example, in US Pat. No. 3,890,537.
  • the discharge lamp has a preheatable electrode 6 (cathode) and a non-preheatable counter electrode 7 (anode).
  • a thyristor 8 Parallel to the lamp 4 and in series with the lamp cathode 6 is a thyristor 8, the control electrode 9 of which is connected via a voltage divider consisting of two resistors 10 and 11 both to the anode 7 of the discharge lamp 4 and to the output 12 of a Schmitt trigger 13 .
  • the Schmitt trigger 13 draws its supply voltage via a peak voltage memory arranged in parallel to the lamp cathode 6, consisting of the series connection of a diode 14 and a charging capacitor 15, from the voltage drop across the preheated cathode 6.
  • the Schmitt trigger 13 is of the same voltage via a parallel to the charging capacitor 15, consisting of a Zener diode 16 and a resistor 17, a voltage divider, the center tap of which is connected to the input 18 of the Schmitt trigger 13.
  • the circuit arrangement according to FIG. 2 is constructed similarly to that according to FIG. 1 and essentially works in the same way. Since commercially available Schmitt triggers (eg Valvo HEF 4093) often only have a low hysteresis, ie that the difference between the control voltages between the tipping points is relatively small, two are negative-coupled in the circuit arrangement according to FIG. 2 by a resistor 21 Schmitt triggers 13a and 13b are provided.
  • Schmitt triggers eg Valvo HEF 4093
  • the charging capacitor 15 in the arrangement according to FIG. 1 must be relatively large so that it is not discharged too quickly by the control current of the thyristor 8. This would lead to undesired re-ignition of the thyristor 8 after the preheating has ended before the lamp 4 itself has ignited.
  • the arrangement according to FIG. 2 manages with a much smaller charging capacitor 15 if the resistor 11 is replaced by a field effect transistor 22 (n-channel enhancement MOSFET) and the diode 14 is moved to the positive end of the lamp cathode 6.
  • the field effect transistor 22 is controlled by the voltage at the output 12 of the Schmitt triggers 13a and 13b.
  • control electrode 9 of the thyristor 8 is connected via the limiting resistor 23 and the field-effect transistor 22 directly to the negative side of the rectifier bridge 3 after the preheating has ended, without the charging capacitor 15 having to supply the control current for the thyristor 8 which may still be flowing .
  • the resistor 10 of the voltage divider 10, 11 or 10, 22 connected to the control electrode 9 of the thyristor 8 can be replaced by a zener diode, the zener voltage of which is somewhat higher than the operating voltage the lamp 4. This provides additional security against undesired re-ignition of the thyristor 8, since after the lamp 4 has been ignited, a positive voltage can no longer reach the control electrode 9 of the thyristor 8.

Landscapes

  • Circuit Arrangements For Discharge Lamps (AREA)
EP82200006A 1981-01-07 1982-01-05 Disposition de circuit d'allumage et fonctionnement d'une lampe de décharge à basse pression à partir d'une source de courant continu Expired EP0055995B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19813100177 DE3100177A1 (de) 1981-01-07 1981-01-07 Schaltungsanordnung zum zuenden und betrieb einer niederdruckentladungslampe aus einer gleichstromquelle
DE3100177 1981-01-07

Publications (2)

Publication Number Publication Date
EP0055995A1 true EP0055995A1 (fr) 1982-07-14
EP0055995B1 EP0055995B1 (fr) 1985-05-02

Family

ID=6122245

Family Applications (1)

Application Number Title Priority Date Filing Date
EP82200006A Expired EP0055995B1 (fr) 1981-01-07 1982-01-05 Disposition de circuit d'allumage et fonctionnement d'une lampe de décharge à basse pression à partir d'une source de courant continu

Country Status (3)

Country Link
EP (1) EP0055995B1 (fr)
JP (1) JPS57136799A (fr)
DE (2) DE3100177A1 (fr)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0270183A1 (fr) * 1986-12-02 1988-06-08 Philips Patentverwaltung GmbH Dispositif de circuit pour le fonctionnement de lampes de décharge à gaz sous haute pression au moyen d'un courant d'alimentation pulsé
AT386314B (de) * 1983-11-23 1988-08-10 Tungsram Reszvenytarsasag Hochdruck-gasentladungs-lichtquelle mit einer hochdruck-gasentladungslampe
EP0427042A2 (fr) * 1989-11-04 1991-05-15 Ruhrkohle Aktiengesellschaft Système pour commander une lampe portative

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS59211995A (ja) * 1983-05-14 1984-11-30 松下電工株式会社 高圧放電灯点灯装置
GB2153606A (en) * 1984-01-26 1985-08-21 Rodney Cairn Hope Output current controller for fluorescent lamp ballast
DK339586D0 (da) * 1986-07-16 1986-07-16 Silver Gruppen Prod As Elektronisk ballast

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3611024A (en) * 1968-07-23 1971-10-05 Matsushita Electric Ind Co Ltd Semiconductor apparatus for controlling the brightness of a discharge lamp
US3720861A (en) * 1970-12-21 1973-03-13 Teletype Corp Fluorescent lamp igniting circuit
US3890537A (en) * 1974-01-02 1975-06-17 Gen Electric Solid state chopper ballast for gaseous discharge lamps

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3611024A (en) * 1968-07-23 1971-10-05 Matsushita Electric Ind Co Ltd Semiconductor apparatus for controlling the brightness of a discharge lamp
US3720861A (en) * 1970-12-21 1973-03-13 Teletype Corp Fluorescent lamp igniting circuit
US3890537A (en) * 1974-01-02 1975-06-17 Gen Electric Solid state chopper ballast for gaseous discharge lamps

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AT386314B (de) * 1983-11-23 1988-08-10 Tungsram Reszvenytarsasag Hochdruck-gasentladungs-lichtquelle mit einer hochdruck-gasentladungslampe
EP0270183A1 (fr) * 1986-12-02 1988-06-08 Philips Patentverwaltung GmbH Dispositif de circuit pour le fonctionnement de lampes de décharge à gaz sous haute pression au moyen d'un courant d'alimentation pulsé
EP0427042A2 (fr) * 1989-11-04 1991-05-15 Ruhrkohle Aktiengesellschaft Système pour commander une lampe portative
EP0427042A3 (en) * 1989-11-04 1992-05-27 Ruhrkohle Aktiengesellschaft System for operating a portable lamp

Also Published As

Publication number Publication date
EP0055995B1 (fr) 1985-05-02
JPS57136799A (en) 1982-08-23
DE3100177A1 (de) 1982-08-05
DE3263317D1 (en) 1985-06-05

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