EP0337022A1 - Zündhilfsgerät für eine Entladungslampe - Google Patents

Zündhilfsgerät für eine Entladungslampe Download PDF

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Publication number
EP0337022A1
EP0337022A1 EP88303280A EP88303280A EP0337022A1 EP 0337022 A1 EP0337022 A1 EP 0337022A1 EP 88303280 A EP88303280 A EP 88303280A EP 88303280 A EP88303280 A EP 88303280A EP 0337022 A1 EP0337022 A1 EP 0337022A1
Authority
EP
European Patent Office
Prior art keywords
starting
lamp
starting assistance
assistance device
voltage
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Withdrawn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
EP88303280A
Other languages
English (en)
French (fr)
Inventor
David John Cockram
Edgar Stanley Richard Cockram
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.)
Actronic Lighting CC
Original Assignee
Actronic Lighting CC
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 Actronic Lighting CC filed Critical Actronic Lighting CC
Priority to EP88303280A priority Critical patent/EP0337022A1/de
Publication of EP0337022A1 publication Critical patent/EP0337022A1/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Withdrawn legal-status Critical Current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

Definitions

  • This invention relates to a starting assistance device for use with a gas discharge lamp.
  • Gas discharge lamps are normally driven from a source of AC electrical current via a current or voltage regulating device.
  • An ignition device typically applies high voltage pulses to the lamp to ignite it, the ignition pulses being removed once the lamp has been ignited.
  • a starting assistance capacitor be switched into the lamp circuit during the period that ignition pulses are applied to the lamp, but only during this period. This is commonly achieved by connecting a starting assistance device comprising, in series, a capacitor, a resistor, and a switch, in parallel with the lamp. The switch is controlled by a timer or other means, and is closed during the period that ignition pulses are applied to the lamp.
  • switches and timers in such a circuit increases its expense and may introduce problems of reliability. It is therefore plausible for manufacturers to omit switches or timers and to leave the capacitor and resistor permanently connected in parallel with the lamp. The effect of this is that a certain amount of power is continuously dissipated by the starting assistance device. In low power applications, this may not be a serious problem. However, where high power, high voltage lamps are used, a suitably rated starting assistance capacitor may dissipate 1000W. This is clearly undesirable.
  • a starting assistance device for use in conjunction with an ignition device for a gas discharge lamp, the lamp being driven in use by a source of electrical current and the ignition device being of the kind which applies starting pulses to the lamp which have a higher voltage than the voltage of the source, the starting assistance device comprising at least one voltage-sensitive solid-state device which is placed in circuit with the lamp and the ignition device and which provides a relatively low impedance return path for starting pulses of the ignition device, but which presents a relatively high impedance to the source of electrical current when the ignition device is inoperative.
  • the starting assistance device may comprise a pair of zener diodes connected in series with opposite polarity, the voltage ratings of the zener diodes being selected so that they are essentially non conducting at the voltage of the source of electrical current.
  • a gas discharge lamp 10 is arranged to be driven by a source of AC electrical current via a regulating device 12.
  • An ignition device 14 between the regulating device 12 and the lamp 10 provides high frequency, high voltage pulses to ignite the lamp 10.
  • a starting assistance device comprising, in series, two zener diodes ZD1 and ZD2, is connected in parallel with the ignition device 14 between the regulating device 12 and the ignition device 14.
  • the zener diodes ZD1 and ZD2 are connected in series, with opposed polarity, as illustrated.
  • the open-circuit voltage at the output of the regulating device 12 will be relatively high, but will not exceed a predetermined threshold level determined by the voltage ratings of the zener diodes ZD1 and ZD2. These zener diodes will thus not conduct.
  • the ignition device 14 When the ignition device 14 begins to supply high voltage pulses to the lamp 10, the return path for the high frequency, high voltage pulses has a high impedance through the regulating device 12. This causes the voltage across the starting assistance device to rise until the zener diodes become conductive, thus providing a lower impedance path for the starting pulses. The effect of this is that a greater proportion of the power of the starting pulses is supplied to the lamp, rather than being dissipated in the rest of the circuit.
  • the igniter is turned of (either manually or automatically), thus removing the high voltage starting pulses and causing the zener diodes to become non-conductive once more.
  • FIG 2 shows an alternative embodiment of the starting assistance device.
  • the starting assistance device comprises a silicon bilateral switch (SBS) 16 of the kind which, once it has switched into a conductive state, remains in that state while current passes therethrough.
  • SBS silicon bilateral switch
  • a pair of silicon controlled rectifiers (SCR's) or a triac can be used.
  • a capacitor C and a resistor R are connected in series with the SBS 16. The purpose of the capacitor is to prevent the SBS 16 from remaining conductive once the lamp 10 has ignited and the ignition device 14 has ceased to provide high voltage starting pulses.
  • the resistor R may be used in order to limit the maximum current passing through the starting assistance device, and may be omitted in most cases.
  • the circuit of Figure 1 will generally not require any current limiting device, since the current ratings of modern semiconductor devices are, in most cases, adequate to the task.
  • the illustrated starting assistance devices are particularly useful with ignition devices which operate automatically by sensing the voltage applied to the lamp, and eliminate the need for switching or timing devices.
  • the starting assistance device can be incorporated in the ignition device, away from the regulating device. This reduces the possibility of high voltages appearing across the regulating device since the starting assistance device provides a low impedance return circuit path for the high voltage ignition pulses.

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  • Circuit Arrangements For Discharge Lamps (AREA)
EP88303280A 1988-04-12 1988-04-12 Zündhilfsgerät für eine Entladungslampe Withdrawn EP0337022A1 (de)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP88303280A EP0337022A1 (de) 1988-04-12 1988-04-12 Zündhilfsgerät für eine Entladungslampe

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP88303280A EP0337022A1 (de) 1988-04-12 1988-04-12 Zündhilfsgerät für eine Entladungslampe

Publications (1)

Publication Number Publication Date
EP0337022A1 true EP0337022A1 (de) 1989-10-18

Family

ID=8200026

Family Applications (1)

Application Number Title Priority Date Filing Date
EP88303280A Withdrawn EP0337022A1 (de) 1988-04-12 1988-04-12 Zündhilfsgerät für eine Entladungslampe

Country Status (1)

Country Link
EP (1) EP0337022A1 (de)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1997021328A1 (de) * 1995-12-01 1997-06-12 Robert Bosch Gmbh Eingangsbeschaltung für eine zündvorrichtung einer hochdruck-gasentladungslampe
EP1033906A2 (de) * 1999-03-04 2000-09-06 Patent-Treuhand-Gesellschaft für elektrische Glühlampen mbH Einseitig gesockelte Hochdruckentladungslampe mit im Sockel integrierter Zündvorrichtung
EP2197249A1 (de) * 2008-10-30 2010-06-16 Koito Manufacturing Co., Ltd. Entladungslampenbeleuchtungsschaltung

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4240009A (en) * 1978-02-27 1980-12-16 Paul Jon D Electronic ballast
EP0030785A1 (de) * 1979-09-20 1981-06-24 Davis Engineering Limited Anpassungsschaltungen für elektrische Entladungslampen
US4339695A (en) * 1980-06-05 1982-07-13 Unicorn Electrical Products High pressure sodium lamp ballast circuit
US4663569A (en) * 1985-09-26 1987-05-05 General Electric Company Energy management/dimming system and control

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4240009A (en) * 1978-02-27 1980-12-16 Paul Jon D Electronic ballast
EP0030785A1 (de) * 1979-09-20 1981-06-24 Davis Engineering Limited Anpassungsschaltungen für elektrische Entladungslampen
US4339695A (en) * 1980-06-05 1982-07-13 Unicorn Electrical Products High pressure sodium lamp ballast circuit
US4663569A (en) * 1985-09-26 1987-05-05 General Electric Company Energy management/dimming system and control

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1997021328A1 (de) * 1995-12-01 1997-06-12 Robert Bosch Gmbh Eingangsbeschaltung für eine zündvorrichtung einer hochdruck-gasentladungslampe
EP1033906A2 (de) * 1999-03-04 2000-09-06 Patent-Treuhand-Gesellschaft für elektrische Glühlampen mbH Einseitig gesockelte Hochdruckentladungslampe mit im Sockel integrierter Zündvorrichtung
EP1033906A3 (de) * 1999-03-04 2001-09-19 Patent-Treuhand-Gesellschaft für elektrische Glühlampen mbH Einseitig gesockelte Hochdruckentladungslampe mit im Sockel integrierter Zündvorrichtung
EP2197249A1 (de) * 2008-10-30 2010-06-16 Koito Manufacturing Co., Ltd. Entladungslampenbeleuchtungsschaltung
US8314573B2 (en) 2008-10-30 2012-11-20 Koito Manufacturing Co., Ltd. Discharge lamp lighting circuit

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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: 19900419