EP0327404A1 - Elektronisches Vorschaltgerät und Anlaufschaltung - Google Patents

Elektronisches Vorschaltgerät und Anlaufschaltung Download PDF

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Publication number
EP0327404A1
EP0327404A1 EP89301116A EP89301116A EP0327404A1 EP 0327404 A1 EP0327404 A1 EP 0327404A1 EP 89301116 A EP89301116 A EP 89301116A EP 89301116 A EP89301116 A EP 89301116A EP 0327404 A1 EP0327404 A1 EP 0327404A1
Authority
EP
European Patent Office
Prior art keywords
parallel elements
lamp
starter circuit
resistive element
parallel
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.)
Withdrawn
Application number
EP89301116A
Other languages
English (en)
French (fr)
Inventor
Howard Noel Mahomed
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.)
CENTURY INTERNATIONAL Ltd
Original Assignee
CENTURY INTERNATIONAL Ltd
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 CENTURY INTERNATIONAL Ltd filed Critical CENTURY INTERNATIONAL Ltd
Publication of EP0327404A1 publication Critical patent/EP0327404A1/de
Withdrawn legal-status Critical Current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
    • H05B41/16—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
    • 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

Definitions

  • This invention relates to a ballast and electronic starting circuit for a low pressure discharge lamp such as a fluorescent lamp.
  • the present invention provides an electronic ballast for a low pressure discharge lamp such as a fluorescent lamp comprising a stabilizer load for series connection with said lamp and an electronic starter circuit for parallel connection with the said lamp and for series connection with the heater electrodes of said lamp, said starter circuit comprising 3 parallel elements, the first of said parallel elements comprising a triac, the second of said parallel elements comprising a twin branch voltage divider with a resistive element in the first of said branches and a capacitive element in the second of said branches, the third of said parallel elements comprising a series connection of a diode element and a resistive element, wherein said capacitive element of said second branch is connected across the gate of the said triac by means of a diode or diac.
  • the stabilizer load may comprise an inductive element in series with a capacitive element bridged by a resistive element.
  • the electronic ballast of the invention may include a variable resistive element in the second of said parallel elements which acts as a dimmer.
  • the invention also provides an electronic starter circuit for parallel connection with a low pressure discharge lamp such as a fluorescent lamp and for series connection with the heater electrodes of said lamp, said starter circuit comprising three parallel elements, the first of said parallel elements comprising a triac, the second of said parallel elements comprising a twin branch voltage divider with a resistive element in the first of said branches and a capacitive element in the second of said branches, the third of said parallel elements comprising a series connection of a diode element and a resistive element, wherein said capacitive element of said second branch is connected across the gate of the said triac by means of a diode or diac.
  • the Figure shows a low pressure discharge lamp such as a fluorescent lamp 1 in place with the ballast and starter circuit of the invention generally designated 2.
  • Stabilizing load 3 is connected in series between the mains voltage 18 (which may include a switch, not shown) and the lamp 1.
  • Stabilizing load 3 consists of an inductive portion 4 and a capacitive portion 5 which latter portion is bridged by resistive element 6.
  • Electronic starter circuit 7 is connected in parallel with the lamp 1 and in series with the heater electrodes designated 8 and 9 respectively.
  • Starter circuit 7 consists of 3 parallel elements:
  • Voltage divider 11 is connected to gate 16 of triac 10 by means of diode or diac 17.
  • circuits as shown in Figure 1 for operation on 120 volts a.c. at 60 hertz with a 4 foot 60 watt fluorescent lamp has the following components: inductors 1 0.27 henry capacitors 5 6 micro f 13 333 micro f resistors 6 750 k ohms 12 750 k ohms 14 47 k ohms triac 10 diac 17 diode 15 In4004
  • the above-mentioneed components have the following values: inductors 1 0.27 henry capacitors 5 5 micro f 13 0.033 micro f resistors 6 750 k ohms 12 680 k ohms 14 47 k ohms triac 10 1 amp 600V piv diac 17 st-2 diode 15 In4004
  • resistor 12 may be variable in order to provide a dimming effect.

Landscapes

  • Circuit Arrangements For Discharge Lamps (AREA)
EP89301116A 1988-02-04 1989-02-06 Elektronisches Vorschaltgerät und Anlaufschaltung Withdrawn EP0327404A1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CA558113 1988-02-04
CA558113 1988-02-04

Publications (1)

Publication Number Publication Date
EP0327404A1 true EP0327404A1 (de) 1989-08-09

Family

ID=4137386

Family Applications (1)

Application Number Title Priority Date Filing Date
EP89301116A Withdrawn EP0327404A1 (de) 1988-02-04 1989-02-06 Elektronisches Vorschaltgerät und Anlaufschaltung

Country Status (1)

Country Link
EP (1) EP0327404A1 (de)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0437908A1 (de) * 1989-09-07 1991-07-24 Council of Scientific and Industrial Research Elektronisches und kapazitives Vorschaltgerät für fluoreszierende und andere Entladungslampen

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4145638A (en) * 1975-05-20 1979-03-20 Nec Sylvania Corporation Discharge lamp lighting system using series connected starters
FR2441990A1 (fr) * 1978-11-17 1980-06-13 Lampes Sa Dispositif d'allumage electronique pour lampe fluorescente, et systeme d'eclairage equipe d'un tel dispositif
US4406976A (en) * 1981-03-30 1983-09-27 501 Advance Transformer Company Discharge lamp ballast circuit

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4145638A (en) * 1975-05-20 1979-03-20 Nec Sylvania Corporation Discharge lamp lighting system using series connected starters
FR2441990A1 (fr) * 1978-11-17 1980-06-13 Lampes Sa Dispositif d'allumage electronique pour lampe fluorescente, et systeme d'eclairage equipe d'un tel dispositif
US4406976A (en) * 1981-03-30 1983-09-27 501 Advance Transformer Company Discharge lamp ballast circuit

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0437908A1 (de) * 1989-09-07 1991-07-24 Council of Scientific and Industrial Research Elektronisches und kapazitives Vorschaltgerät für fluoreszierende und andere Entladungslampen

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Legal Events

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PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

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Effective date: 19910901