EP0754399B1 - Schaltungsanordnung zur zündung einer entladungslampe hoher intensität - Google Patents

Schaltungsanordnung zur zündung einer entladungslampe hoher intensität Download PDF

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Publication number
EP0754399B1
EP0754399B1 EP96900163A EP96900163A EP0754399B1 EP 0754399 B1 EP0754399 B1 EP 0754399B1 EP 96900163 A EP96900163 A EP 96900163A EP 96900163 A EP96900163 A EP 96900163A EP 0754399 B1 EP0754399 B1 EP 0754399B1
Authority
EP
European Patent Office
Prior art keywords
lamp
voltage
ignitor
ignition
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.)
Expired - Lifetime
Application number
EP96900163A
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English (en)
French (fr)
Other versions
EP0754399A1 (de
Inventor
Allen E. Brown
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.)
Koninklijke Philips NV
Original Assignee
Koninklijke Philips Electronics NV
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Publication date
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Publication of EP0754399A1 publication Critical patent/EP0754399A1/de
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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

Definitions

  • This invention relates to a circuit arrangement for ignition of a high intensity discharge lamp.
  • the circuit arrangement is formed by a ballast for the HID lamp. It is also possible that the circuit arrangement is formed by a separate ignitor.
  • An HID lamp generally refers to a family of lamps including high pressure mercury, high pressure sodium, metal halide and low pressure sodium.
  • a HID lamp has during ignition a glow mode, in which a glow discharge is developed in the lamp before a full arc discharge takes place.
  • a conventional ballast for powering an HID lamp includes an ignitor. The ignitor provides high voltage ignition pulses applied to the lamp for starting the latter.
  • the energy from the high voltage pulses generated by the ignitor are provided to the lamp prior to the lamp entering its glow mode. At the time that the lamp begins to enter its glow mode, the ignitor is shut off. No high voltage pulses are generated during the glow mode. When ignition is successful, the lamp proceeds rapidly through the glow mode to a steady state condition, that is, from a glow discharge to an arc discharge condition between the lamp's electrodes.
  • a steady state condition that is, from a glow discharge to an arc discharge condition between the lamp's electrodes.
  • the amount of energy required for successful ignition varies and depends on factors such as, but not limited to, partial pressures of the gasses within the lamp.
  • partial pressures of the gasses within the lamp When an insufficient amount of energy is delivered to the HID lamp to ignite the latter, the lamp can become stuck in its glow mode and never reach a steady state (full arc) condition.
  • the ignitor in particular, should avoid prolonged periods of time within the glow mode.
  • a circuit arrangement for ignition of a high intensity discharge lamp having during ignition a glow mode, includes output terminals and an ignitor for production at igniting the lamp of ignition pulses prior to and at least substantially throughout the glow mode of the high intensity discharge lamp.
  • the ignitor includes a voltage sensor for sensing the voltage across the output terminals and is responsive to the voltage sensor in its production of ignition pulses.
  • the circuit arrangement avoids remaining the lamp within the glow mode for an extended period of time by production of ignition pulses not only prior to but also substantially throughout the glow mode of the high intensity discharge lamp.
  • the ignition pulses produced prior to and substantially throughout the glow mode provide sufficient energy for successful takeover, that is, for the lamp to move from a glow discharge to arc discharge operating condition. Damage of the lamp electrodes and consequent lamp destruction based on prolonged duration of operation within the glow mode during start-up is substantially eliminated.
  • the ignitor includes a bilateral switching device such as, but not limited to, a SIDAC having a breakover voltage chosen to correspond to the voltage across the lamp at about the end of the lamp's glow mode.
  • the ignitor preferable also includes a capacitor coupled to the bilateral switching device through which the capacitor discharges at breakover of the bilateral switching device.
  • the invention accordingly comprises several steps in the relation of one or more such steps with respect to each of the others, and the device embodying features of construction, combination of elements and arrangements of parts which are adapted to effect such steps, all is exemplified in the following detailed disclosure, and the scope of the invention will be indicated in the claims.
  • the circuit arrangement comprises a ballast 10 which is connected through a pair of input terminals 33 and 36 to an A.C. source 20.
  • Ballast 10 provides power through a pair of output terminals 39 and 42 to an HID lamp 40.
  • Ballast 10 includes an autotransformer 60 having a primary winding 60 with a tap 63. Winding 60 is connected to input terminals 33 and 36. A capacitor 66 is connected between tap 63 and one end of a ballast winding 65. Ballast winding 65 which is magnetically coupled to primary winding 60 includes a first tap 76 and a second tap 77. The portion of ballast winding 65 between taps 76 and 77 is commonly referred to as an ignitor winding 79. The other end of ballast winding 65 is connected to output terminal 39.
  • Ballast winding 65 serves to limit/control the level of current flowing through lamp 40 when the latter is lit.
  • a SIDAC 89 and a capacitor 92 are connected respectively to taps 76 and 77.
  • SIDAC 89 and capacitor 92 are also connected through the serial combination of an inductor 95 and a resistor 96 to the junction joining primary winding 60, input terminal 36 and output terminal 42 together.
  • Ignitor winding 79, SIDAC 89, capacitor 92, inductor 95 and resistor 96 serve together as an ignitor (i.e., starting circuit) 80.
  • Ignitor 80 can be integrally connected to ballast winding 79.
  • SIDAC 89 and capacitor 92 can be detachably connected to tap points 76 and 77, respectively.
  • Ballast 10 operates as follows. Power is supplied from A.C. source 20 to input terminals 33 and 36 of ballast 10. The voltage produced by A.C. source 20 is insufficient to ignite/start lamp 40, the latter of which requires ignition (starting) pulses. The ignition pulses are provided by ignitor 80. More particularly, as current flows through capacitor 92, inductor 95 and resistor 96, capacitor 92 charges to the breakover voltage of SIDAC 89.
  • the breakover voltage is chosen so as to correspond to the characteristic glow discharge voltage of lamp 40, that is to say equal to or just below the glow discharge voltage of the lamp 40, but well above the voltage of the steady arc of the lamp.
  • the glow discharge voltage will differ for different types of HID lamps and depend amongst others on whether the lamp has electrodes with or without emitter. For lamps having electrodes with emitter the glow discharge voltage will be significantly lower than in case of comparable lamps having electrodes without emitter.
  • the glow discharge voltage of a lamp can easily be determined experimentally.
  • the breakover voltage is chosen as to correspond to the voltage across the lamp at about the end of the lamp glow mode.
  • SIDAC 89 switches from its previous OFF-state to its ON-state.
  • Capacitor 92 now discharges through ignitor winding 79 and SIDAC 89 resulting in a voltage pulse produced across ignitor winding 79.
  • transformer action i.e. ballast 65 acting as an autotransformer
  • a high voltage pulse is developed across output terminals 39, 42.
  • the cyclical charging and discharging of capacitor 92 produces a series of high voltage pulses across output terminals 39, 42.
  • SIDAC 89 serves as a voltage sensor for sensing the voltage across output terminals 39 and 42 of ballast 10. Ignitor 80, in response to SIDAC 89 cyclically turning ON and OFF, provides a sufficient amount of energy for successful takeover of lamp 40. In particular, the continuous production of ignition pulses prior to and at least substantially throughout the glow mode avoids lamp 40 remaining within the glow mode for an extended period of time. Damage of the lamp electrodes and consequent lamp destruction based on prolonged duration within the glow mode is substantially eliminated.
  • lamp 40 when lamp 40 is of a metal halide type, nominally rated at 150 watts, 95 volts with SIDAC 89 having a breakover voltage of between about 110-125 volts, a voltage pulse of about 110-125 volts is applied across ignitor winding 79. A voltage of about 1800 to 3500 volts is developed across output terminals 39, 42 for starting the lamp.
  • the SIDAC breakover of about 110-125 volts corresponds to a lamp voltage of between 150v - 200v, respectively.
  • the cycle of charging capacitor 92 until reaching the SIDAC breakover voltage resulting in the generation of a high voltage pulse applied to lamp 40 is repeated prior to and at least substantially throughout the glow mode of lamp 40. Ignitor 80 is shut OFF at the end of the glow mode.
  • ballast 30 is a 150 watt metal halide constant wattage autotransformer (CWA) available from Advance Transformer Company of Rosemont, Illinois as part no. 71A5486.
  • Capacitor 66 is nominally rated at 22.5 ⁇ F, 240 volts.
  • SIDAC 89 is available from Shindengen Electric Mfg. Co., Ltd. as Part No. K1V12 and has a nominally rated breakover voltage of about 110-125 volts.
  • Capacitor 92 is nominally rated at about 0.33 microfarads.
  • Lamp 40 is a high intensity discharge type, such as but not limited to, a 150 watt, 95 volt metal halide type.
  • Inductor 96 typically includes two serial connected coils, each nominally rated at 22 millihenries. Resistor 95 is nominally rated at 3.5 kohm.
  • the invention provides an improved ignition in which ignition pulses are produced prior to and at least substantially throughout the glow mode of lamp 40. Prolonged periods of time of lamp operation within the glow mode are substantially eliminated by providing sufficient energy for successful takeover of the lamp 40.

Landscapes

  • Circuit Arrangements For Discharge Lamps (AREA)

Claims (4)

  1. Schaltungsanordnung zur Zündung einer Entladungslampe (40) mit hoher Intensität, welche einen Glimmzustand während der Zündung vorsieht, mit:
    Ausgangsklemmen (39, 42) und
    einem Ignitor (80), um bei Zünden der Lampe vor dem Glimmzustand der Entladungslampe hoher Lichtstärke Zündimpulse zu erzeugen, wobei der Ignitor einen Spannungssensor (89) aufweist, um die Spannung an den Ausgangsklemmen zu erfassen und bei der Erzeugung von Zündimpulsen auf den Spannungssensor anspricht, dadurch gekennzeichnet, dass der Ignitor so ausgelegt ist, dass er Zündimpulse ebenfalls im Wesentlichen während des Glimmzustands erzeugt.
  2. Schaltungsanordnung nach Anspruch 1, wobei der Ignitor ein bilaterales Schaltelement (89) mit einer Kippspannung aufweist, welche so ausgewählt ist, dass sie der Spannung an der Lampe etwa am Ende des Glimmzustands der Lampe entspricht.
  3. Schaltungsanordnung nach Anspruch 2, wobei der Ignitor einen Kondensator (92) aufweist, welcher an das bilaterale Schaltelement gekoppelt ist, über welches sich der Kondensator bei Schalten des bilateralen Schaltelementes entlädt.
  4. Schaltungsanordnung nach Anspruch 3, wobei das bilaterale Schaltelement durch einen SIDAC dargestellt ist.
EP96900163A 1995-02-07 1996-01-23 Schaltungsanordnung zur zündung einer entladungslampe hoher intensität Expired - Lifetime EP0754399B1 (de)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
US386904 1989-07-28
US38690495A 1995-02-07 1995-02-07
PCT/IB1996/000051 WO1996025022A1 (en) 1995-02-07 1996-01-23 Circuit arrangement for ignition of a high intensity discharge lamp

Publications (2)

Publication Number Publication Date
EP0754399A1 EP0754399A1 (de) 1997-01-22
EP0754399B1 true EP0754399B1 (de) 2001-10-17

Family

ID=23527563

Family Applications (1)

Application Number Title Priority Date Filing Date
EP96900163A Expired - Lifetime EP0754399B1 (de) 1995-02-07 1996-01-23 Schaltungsanordnung zur zündung einer entladungslampe hoher intensität

Country Status (7)

Country Link
EP (1) EP0754399B1 (de)
JP (1) JPH09511870A (de)
CN (1) CN1096219C (de)
CA (1) CA2187218A1 (de)
DE (1) DE69615951T2 (de)
TW (1) TW311799U (de)
WO (1) WO1996025022A1 (de)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6144171A (en) * 1999-05-07 2000-11-07 Philips Electronics North America Corporation Ignitor for high intensity discharge lamps
JP2002230772A (ja) * 2001-01-31 2002-08-16 Sanyo Electric Co Ltd データ記録装置及びデータ記録装制御装置

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4678968A (en) * 1985-02-15 1987-07-07 Gte Products Corporation High intensity discharge lamp starting and operating apparatus
US4695771A (en) * 1985-07-29 1987-09-22 Advance Transformer Company Ignition circuit for high pressure arc discharge lamps
US5051665A (en) * 1990-06-21 1991-09-24 Gte Products Corporation Fast warm-up ballast for arc discharge lamp

Also Published As

Publication number Publication date
JPH09511870A (ja) 1997-11-25
WO1996025022A1 (en) 1996-08-15
CA2187218A1 (en) 1996-08-15
EP0754399A1 (de) 1997-01-22
DE69615951D1 (de) 2001-11-22
TW311799U (en) 1997-07-21
CN1096219C (zh) 2002-12-11
DE69615951T2 (de) 2002-06-20
CN1146847A (zh) 1997-04-02

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