EP0055995B1 - 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
EP0055995B1
EP0055995B1 EP82200006A EP82200006A EP0055995B1 EP 0055995 B1 EP0055995 B1 EP 0055995B1 EP 82200006 A EP82200006 A EP 82200006A EP 82200006 A EP82200006 A EP 82200006A EP 0055995 B1 EP0055995 B1 EP 0055995B1
Authority
EP
European Patent Office
Prior art keywords
voltage
electrode
lamp
circuit arrangement
switching element
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
Application number
EP82200006A
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German (de)
English (en)
Other versions
EP0055995A1 (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
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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 reaching it 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.
  • Such a circuit arrangement is known from US-PS 3720861.
  • This circuit arrangement works with pure direct current and uses a bipolar transistor, which is controlled by a thyristor, to switch the heating circuit of the lamp.
  • a bipolar transistor which is controlled by a thyristor, to switch the heating circuit of the lamp.
  • a thyristor When operating with pure direct current, however, only a single attempt to start is possible. If the lamp does not ignite, the thyristor remains conductive and a new attempt can only be made after the voltage has been switched off and on again.
  • this circuit arrangement is dependent on the use of a high-voltage transistor designed for the ignition voltage of the lamp. However, these have only a small current gain, so that a resistor in series with the control thyristor must be correspondingly small.
  • 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 is connected via a voltage divider both to the anode of the discharge lamp and to the output of the Schmitt trigger, which is dependent on the voltage from the voltage drop across the preheated electrode is controlled via a voltage divider which is parallel to the charging capacitor and consists of a zener diode and a resistor.
  • 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 break points became too small for the application in question.
  • Operation with pulsating direct current has the advantage that a thyristor can be used as the 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 of an electronic switched-mode power supply, as is e.g. in U.S. Patent 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 with 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 low pressure discharge lamp 4 e.g. a 20W fluorescent lamp is supplied with pulsating direct current via the rectifier bridge 3.
  • the ballast 5 serves to limit the current. After the mains voltage has been applied, no current initially flows through the lamp cathode 6; the connection points 19 and 20 thus have the same potential.
  • the output 12 of the Schmitt trigger 13 is necessarily at the same potential.
  • the control electrode 9 of the thyristor 8 therefore receives a positive voltage via the voltage divider 10, 11, so that the thyristor 8 can ignite. After the thyristor 8 has been ignited, a current flows through it through the preheatable cathode 6 and is limited only by the ballast 5.
  • the lamp current flows over the cathode 6 and causes a voltage drop between points 19 and 20; this is sufficient to keep the Schmitt trigger 13 in its stable state. Only when the voltage between points 19 and 20 is very low, which is only below when the lamp 4 is not ignited or when it is switched off, does the Schmitt trigger 13 flip back to its original state and enables the thyristor 8 and thus one to be fired again try to start lamp 4 again (in practice after about 0.1 sec).
  • the circuit arrangement according to FIG. 1 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 in a low-resistance manner via a 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 which may still be flowing for the thyristor 8.
  • the resistor 10 of the voltage connected to the control electrode 9 of the thyristor 8 divider 10, 11 or 10, 22 can be replaced by a Zener diode, the Zener voltage is slightly higher than the operating voltage of the lamp 4. This provides additional security against undesired re-ignition of the thyristor 8, since after ignition of the lamp 4 no positive Voltage can reach the control electrode 9 of the thyristor 8.

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  • Circuit Arrangements For Discharge Lamps (AREA)

Claims (6)

1. Circuit d'allumage et de fonctionnement d'une lampe à décharge à basse pression à partir d'une source de courant continu, lampe qui est munie de deux électrodes dont au moins une est préchauffable et dans laquelle un élément interrupteur électronique disposé en parallèle avec la lampe et en série avec l'électrode (la cathode) préchauffable est amené dans son état non conducteur après que la température d'allumage de l'électrode préchauffée a été atteinte, de sorte que le circuit de courant de chauffage est interrompu et que la pleine tension continue est appliquée à la lampe, caractérisé en ce que la source de courant continu (1 à 3) engendre un courant continu pulsatoire et en ce que l'élément interrupteur électronique (8) est commuté par une bascule Schmitt (13) qui est commandée en fonction de la température de l'électrode préchauffée (6) et qui à travers une mémoire de tension de crête disposée en parallèle avec l'électrode préchauffable et constituée du montage série d'une diode (14) et d'un condensateur de charge (15), prélève sa tension d'alimentation sur la chute de tension aux extrémités de l'électrode préchauffée.
2. Circuit selon la revendication 1, caractérisé en ce qu'à travers un diviseur de tension (10, 11) l'électrode de commande (9) de l'élément interrupteur électronique est reliée à la fois à l'anode (7) de la lampe à décharge (4) et à la sortie (12) de la bascule Schmitt (13) qui est excitée par la tension déduite de la chute de tension aux extrémités de l'électrode préchauffée (6) à travers un diviseur de tension disposé en parallèle avec le condensateur de charge (15) et constitué par une diode Zener (16) et une résistance (17).
3. Circuit selon la revendication 2, caractérisé en ce que le diviseur de tension (10, 22) raccordé à l'électrode de commande (9) de l'élément interrupteur électronique (8) présente un transistor à effet de champ (22) disposé du côté de la bascule Schmitt (13), et commandé par la tension sur la sortie (12) de la bascule Schmitt.
4. Circuit selon la revendication 2 ou 3, caractérisé en ce que le diviseur de tension raccordé à l'électrode de commande de l'élément interrupteur électronique est muni d'une diode Zener disposée du côté de l'anode de la lampe.
5. Circuit selon l'une des revendications 1 à 4, caractérisé en ce qu'il est prévu deux bascules Schmitt (13a et 13b) contre-couplées par l'intermédiaire d'une résistance (21 ).
6. Circuit selon l'une des revendications précédentes, caractérisé en ce que l'élément interrupteur électronique est un thyristor (8).
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 EP0055995A1 (fr) 1982-07-14
EP0055995B1 true 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)

Families Citing this family (6)

* 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
HU190862B (en) * 1983-11-23 1986-11-28 Tungsram Rt,Hu High-pressure discharge lamp with favourable colour reproduction
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
DE3641070A1 (de) * 1986-12-02 1988-06-16 Philips Patentverwaltung Schaltungsanordnung zum betrieb von hochdruck-gasentladungslampen mittels eines impulsfoermigen versorgungsstromes
DE3936809C1 (fr) * 1989-11-04 1991-02-21 Ruhrkohle Ag, 4300 Essen, De

Family Cites Families (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 Industrial 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

Also Published As

Publication number Publication date
JPS57136799A (en) 1982-08-23
DE3100177A1 (de) 1982-08-05
EP0055995A1 (fr) 1982-07-14
DE3263317D1 (en) 1985-06-05

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