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US3189789A - Ignition circuit for a discharge lamp - Google Patents

Ignition circuit for a discharge lamp Download PDF

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US3189789A
US3189789A US206597A US20659762A US3189789A US 3189789 A US3189789 A US 3189789A US 206597 A US206597 A US 206597A US 20659762 A US20659762 A US 20659762A US 3189789 A US3189789 A US 3189789A
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Prior art keywords
lamp
controlled rectifier
discharge lamp
capacitor
pulse
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US206597A
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Howell Edward Keith
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General Electric Co
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General Electric Co
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    • 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
    • H05B41/20—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 no starting switch
    • H05B41/23—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 no starting switch for lamps not having an auxiliary starting electrode
    • H05B41/231—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 no starting switch for lamps not having an auxiliary starting electrode for high-pressure lamps
    • 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
    • H05B41/26—Circuit arrangements in which the lamp is fed by power derived from DC by means of a converter, e.g. by high-voltage DC
    • H05B41/28—Circuit arrangements in which the lamp is fed by power derived from DC by means of a converter, e.g. by high-voltage DC using static converters
    • H05B41/288—Circuit arrangements in which the lamp is fed by power derived from DC by means of a converter, e.g. by high-voltage DC using static converters with semiconductor devices and specially adapted for lamps without preheating electrodes, e.g. for high-intensity discharge lamps, high-pressure mercury or sodium lamps or low-pressure sodium lamps
    • H05B41/2881—Load circuits; Control thereof
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S315/00—Electric lamp and discharge devices: systems
    • Y10S315/05—Starting and operating circuit for fluorescent lamp

Definitions

  • the high intensity discharge lamp to be started is a Xenon arc discharge lamp.
  • This lamp is rated to operate at 100 amperes, 20 volt DC. and thus is well within the range of a battery energy output.
  • the lamp is a two electrode polarized arc lamp with a thoriated tungsten cathode and tungsten anode. Initially a high voltage pulse of 30-50 kv. must be applied across the terminal to form a conduction path within the lamp. This must be immedi ately followed by a high current discharge from a source of at least 65 volt DC to form a cathode hot spot for Upon emission and starting of the supply and the normal operation follows at 100 amps, 20 volt.
  • An example of the above lamp is disclosed in US. Patent 2,965,790Ittig et al., issued December 20, 1960.
  • It is a further object of this invention to provide such a pulse generating circuit which utilizes an electron control device having a predetermined voltage breakdown invention provides a pulse generating circuit for a discharge lamp requiring a very high voltage for initiating conduction therein which comprises a controlled rectifier connected to a source of pulsating current and having a controlled electrode, means for rendering the controlled rectifier conductive including a zener diode conected to the gate of the controlled rectifier, and means for delivering a high voltage pulse to the lamp when the'gate of the silicon controlled rectifier is rendered conductive including an operating capacitor connected to the controlled rectifier and the lamp.
  • an operating circuit for discharge lamp 11 includes a low Voltage direct current source, such as a battery 12, conductor 13, a control switch 14, conductor 15, a current-limiting impedance 16, conductor 17, high current rectifier 18, conductor 19, autotransformer coil 20, conductor 21 and conductor 22 to ground.
  • a low Voltage direct current source such as a battery 12, conductor 13, a control switch 14, conductor 15, a current-limiting impedance 16, conductor 17, high current rectifier 18, conductor 19, autotransformer coil 20, conductor 21 and conductor 22 to ground.
  • the discharge lamp 11 is a xenon arc discharge lamp comprising an envelope 23 filled with xenon gas and provided with a thoriated tungsten anode 24 and tungsten cathode 25.
  • the lamp operates 100 amps at 20 volt D.C.; hence, the source 12 can be a 27.5 volt storage battery as is customarily provided on certain vehicles.
  • a 3050,000 volt pulse must be applied across the lamp electrode to initially ionize the gas. 7
  • a step-up inverter rectifier 26 having a pulsating intermediate voltage output, connected between conductors 15 and 22 by conductors 27 and 28.
  • the output from the inverter rectifier 26 is directed to storage capacitor 29 through a resistor 30, resistor 31, conductor 32, and which storage capacitor bank is connected to ground by conductor 33 so that the capacitor is charged at the intermediate volt age.
  • the starting circuit further includes pulse generating circuit, shown Within the dotted lines, 34, the output of which is applied to anode 24 of the lamp 11 through autotransformer coil 20.
  • the inverter rec-tifier circuit 26 may be of the type described in co-pending application of Joe A. Nuckolls, Serial No. 206,613, filed July 2, 1962, and assigned to the same assignee.
  • the pulse generating circuit 34 is provided with a silicon controlled rectifier 38 connected to input conductor 35 through a resistance 39 by conductor 40.
  • An operating capacitor 41 is connected to resistance 39 by conductor 42 and to ground by conductor 43 to form a charging circuit across storage capacitor 29.
  • the operating capacitor 41 provides the triggering action for the control gate 44 of the controlled rectifier 38 through zener diode 45 and diode 46.
  • the zener diode 45 being a substantially constant voltage electron control device, becomes conductive when the charge on the capacitor 41 reaches a predetermined Zener voltage level.
  • the diode &5 When said level is reached, the diode &5 become conductive, triggering the silicon controlled rectifier 38 which draws energy from the capacitor 41 and discharges a high current pulse through conductor 47, through primary 48 of a ringing transformer 49 and conductor 5% connecting the coil to ground.
  • the series connection of operating capacitor 41, silicon controlled rectifier 38 and the primary 48 thereby forms a discharge loop.
  • the secondary 51 of ringing transformer 49 is applied to a pulse transformer circuit including the transformer 29, capacitor 52 and spark gap 53 thereby forming an oscillatory circuit with primary 54 of transformer 26 which induces a damped oscillatory train of high voltage pulses in the pulse transformer circuit.
  • the high voltage I pulse from transformer 49 charges the capacitor 52 to warm up.
  • the inverter rectifier 26 is turned off through conductor 55 as described in the abovementioned co-pending application.
  • Capacitors 56, 57 and 37 provide radio frequency bypassing.
  • the output of inverter rectifier 26 is approximately 170 volts at 300 cycles per second.
  • the zener diode 45 is a substantially constant voltage device which conducts when the voltage rises to 100 volts (this voltage may be varied to suit the lamp starting requirements); thus, at 100 volts, approximately joules of energy are stored in capacitor bank 29 and 0.5 joule in operating capacitor 41.
  • the zener current applied to gate 44 of silicon controlled rectifier 38 is sufficient to make silicon controlled rectifier 38 conductive, extracting approximately 0.5 joule from operating capacitor 41 and delivering it through transformer 49.
  • the voltage drops below 100 volts
  • the zener diode becomes non-conductive and silicon con-.
  • trolled rectifier 38 is turned olf by the tendency of the inductance of ringing transformer 49 and capacitor 41 to oscillate and reverse the current flow through silicon controlled rectifier 38.
  • Capacitors 56 and 57 serve also to limit the rate or rise of the voltage reapplied'to the controlled rectifier 38 to assure turn off of that device.
  • the 100 volt pulse is stepped up by the turns ratio 1:200 of transformer 49 and the voltage on the capacitor 52 rises toward 20,000 volts.
  • the spark gap 53 breaks down when the voltage reaches 10,000 volts and the pulse is delivered into eliective primary 54 of the autotransformer 20.
  • the step-up ratio of the autotransformer being 1:5, a kv., high frequency pulse is provided to the lamp.
  • the negative coefiicient of resistance of the lamp after starting causes the arc drop across the lamp to fall below 100 volts after ignition, thus stopping the operation of the pulse generating circuit, since zener diode 45 does not trigger the gate of silicon controlled rectifier 38.
  • the 10 joules of energy stored in the storage capacitor 29 serves to maintain operation of the lamp and develop a hot spot on the cathode, until the voltagedrop across the lamp falls below the source voltage. At this point the source voltage takes over operation of the lamp through current limiting resistor ballast 16 and high current rectifier 18.
  • the efiect of conductor 55 is such that when the current drawn by the lamp l1 rises to approximately amperes the operation of the inverter rectifier 2s ceases and no further charging of the storage capacitor 29 takes place during operation of the lamp.
  • a pulse generating circuit for a dischargelamp requiring a high voltage pulse for initiating conduction ductive including an operating capacitor and a ringing therein comprising, a discharge lamp, a controlled rectifier connected to a pulsating current source and having a control electrode, means for rendering said controlled rectifier conductive including a zener diode connected to the source and to the control electrode and means including an operating capacitor responsive to the controlled rectifier when it is rendered conductive for delivering a high voltage pulse to the lamp.
  • a pulse generating circuit for a discharge lamp requiring a high voltage pulse for initiating conduction therein comprising, a discharge lamp, a silicon controlled rectifier connected to a pulsating current source and having a control electrode, means for rendering said controlled rectifier conductive including an electron control device which becomes conductive upon the application of a predetermined voltage level connected to the source and to the control electrode of the silicon controlled rectifier and means including an operating capacitor and a stepup transformer responsive to the controlled rectifier when it is rendered conductive for delivering a high voltage pulse to the lamp.
  • a pulse generating circuit for a discharge lamp requiring a high voltage pulse for initiating conduction therein comprising, a discharge lamp, a silicon controlled rectifier connected to a pulsating current source and having a control electrode, means for rendering said controlled rectifier conductive including an electron control device which becomes conductive upon the application of a predetermined voltage. level connected to. the source and to the control electrode of the silicon controlled rectifier and means for delivering a high voltage pulse to the lamp when the controlled rectifier is rendered conductive including an operating capacitor, a step-up transformer connected to the output of said silicon controlled rectifier, a spark gap and asecond capacitor connected to said transformer, said second capacitor being charged from the operating capacitor prior to the breakdown of said spark gap.
  • a pulse generating circuit for a discharge lamp comprising, a discharge lamp, a controlled rectifier connected to a pulsating current source and having a control electrode, means for rendering said controlled rectifier conductive including a zener diode connected to the source and to the electrode of the controlled rectifier, an oscillating circuit for rendering said controlledrcctifier non-controde, means for rendering said controlled rectifier conductive connected to the source and to the control electrode of the controlled rectifier and means including a charging capacitor and a spark gap connected to the controlled rectifier and lamp and responsive to the controlled rectifier-when conductive for delivering a high voltage pulse to the lamp, said capacitor being charged to a predetermined voltage level prior to the breakdown of said spark gap.

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  • Circuit Arrangements For Discharge Lamps (AREA)

Description

June 15, 1965 HOWELL 3,189,789
IGNITION CIRCUIT FOR A DISCHARGE LAMP Filed July 2, 1962 Invervtov Edw d Heh HoweLL b8 9%! is tovneg electron emission. lamp, the arc drops well below the range of the power United States Patent M 3,189,789 IGNITION CIRCUIT FOR A DISCHARGE LAMP Edward Keith Howell, Hendersonville, N.C., assignor to General Electric Company, a corporation of New York Filed July 2, 1%2, Ser. No. 266,597 5 Claims. (Cl. 315-441) This invention relates in general to circuits for discharge lamps and, more particularly, to a high voltage pulse generating circuit for the starting of a high intensity discharge lamp.
The high intensity discharge lamp to be started is a Xenon arc discharge lamp. This lamp is rated to operate at 100 amperes, 20 volt DC. and thus is well within the range of a battery energy output. The lamp is a two electrode polarized arc lamp with a thoriated tungsten cathode and tungsten anode. Initially a high voltage pulse of 30-50 kv. must be applied across the terminal to form a conduction path within the lamp. This must be immedi ately followed by a high current discharge from a source of at least 65 volt DC to form a cathode hot spot for Upon emission and starting of the supply and the normal operation follows at 100 amps, 20 volt. An example of the above lamp is disclosed in US. Patent 2,965,790Ittig et al., issued December 20, 1960.
It is an object of this invention to provide an improved pulse generating circuit for the above lamp and similar discharge lamps which develops a series of high voltage pulses for initiating conduction in the lamp from a source of pulsating current.
It is a further object of this invention to provide such a pulse generating circuit which utilizes an electron control device having a predetermined voltage breakdown invention provides a pulse generating circuit for a discharge lamp requiring a very high voltage for initiating conduction therein which comprises a controlled rectifier connected to a source of pulsating current and having a controlled electrode, means for rendering the controlled rectifier conductive including a zener diode conected to the gate of the controlled rectifier, and means for delivering a high voltage pulse to the lamp when the'gate of the silicon controlled rectifier is rendered conductive including an operating capacitor connected to the controlled rectifier and the lamp.
Further objects and advantages of the invention will appear from the following specification.
A preferred embodiment of the invention is shown in the drawing.
In the drawing, an operating circuit for discharge lamp 11 includes a low Voltage direct current source, such as a battery 12, conductor 13, a control switch 14, conductor 15, a current-limiting impedance 16, conductor 17, high current rectifier 18, conductor 19, autotransformer coil 20, conductor 21 and conductor 22 to ground.
Patented June 15, 1965 The discharge lamp 11, as shown, is a xenon arc discharge lamp comprising an envelope 23 filled with xenon gas and provided with a thoriated tungsten anode 24 and tungsten cathode 25. The lamp operates 100 amps at 20 volt D.C.; hence, the source 12 can be a 27.5 volt storage battery as is customarily provided on certain vehicles. However, to ignite the lamp, a 3050,000 volt pulse must be applied across the lamp electrode to initially ionize the gas. 7
For starting the lamp there is provided a step-up inverter rectifier 26, having a pulsating intermediate voltage output, connected between conductors 15 and 22 by conductors 27 and 28. The output from the inverter rectifier 26 is directed to storage capacitor 29 through a resistor 30, resistor 31, conductor 32, and which storage capacitor bank is connected to ground by conductor 33 so that the capacitor is charged at the intermediate volt age. The starting circuit further includes pulse generating circuit, shown Within the dotted lines, 34, the output of which is applied to anode 24 of the lamp 11 through autotransformer coil 20. The inverter rec-tifier circuit 26 may be of the type described in co-pending application of Joe A. Nuckolls, Serial No. 206,613, filed July 2, 1962, and assigned to the same assignee.
The pulse generating circuit 34 is provided with a silicon controlled rectifier 38 connected to input conductor 35 through a resistance 39 by conductor 40. An operating capacitor 41 is connected to resistance 39 by conductor 42 and to ground by conductor 43 to form a charging circuit across storage capacitor 29. The operating capacitor 41 provides the triggering action for the control gate 44 of the controlled rectifier 38 through zener diode 45 and diode 46. The zener diode 45, being a substantially constant voltage electron control device, becomes conductive when the charge on the capacitor 41 reaches a predetermined Zener voltage level. When said level is reached, the diode &5 become conductive, triggering the silicon controlled rectifier 38 which draws energy from the capacitor 41 and discharges a high current pulse through conductor 47, through primary 48 of a ringing transformer 49 and conductor 5% connecting the coil to ground. The series connection of operating capacitor 41, silicon controlled rectifier 38 and the primary 48 thereby forms a discharge loop.
The secondary 51 of ringing transformer 49 is applied to a pulse transformer circuit including the transformer 29, capacitor 52 and spark gap 53 thereby forming an oscillatory circuit with primary 54 of transformer 26 which induces a damped oscillatory train of high voltage pulses in the pulse transformer circuit. The high voltage I pulse from transformer 49 charges the capacitor 52 to warm up. When the voltage drop across the lamp falls below a predetermined level, the inverter rectifier 26 is turned off through conductor 55 as described in the abovementioned co-pending application. Capacitors 56, 57 and 37 provide radio frequency bypassing.
:9 By way of specific example, the various components above referred to may be the following:
The output of inverter rectifier 26 is approximately 170 volts at 300 cycles per second. As the output of the inverter rectifier 26 is applied to storage capacitor 29, and also to operating capacitor 41 of the pulse generating circuit, energy is stored therein. The zener diode 45 is a substantially constant voltage device which conducts when the voltage rises to 100 volts (this voltage may be varied to suit the lamp starting requirements); thus, at 100 volts, approximately joules of energy are stored in capacitor bank 29 and 0.5 joule in operating capacitor 41. At 100 volts, the zener current applied to gate 44 of silicon controlled rectifier 38 is sufficient to make silicon controlled rectifier 38 conductive, extracting approximately 0.5 joule from operating capacitor 41 and delivering it through transformer 49. When the voltage drops below 100 volts,
the zener diode becomes non-conductive and silicon con-.
trolled rectifier 38 is turned olf by the tendency of the inductance of ringing transformer 49 and capacitor 41 to oscillate and reverse the current flow through silicon controlled rectifier 38. Capacitors 56 and 57 serve also to limit the rate or rise of the voltage reapplied'to the controlled rectifier 38 to assure turn off of that device.
The 100 volt pulse is stepped up by the turns ratio 1:200 of transformer 49 and the voltage on the capacitor 52 rises toward 20,000 volts. The spark gap 53 breaks down when the voltage reaches 10,000 volts and the pulse is delivered into eliective primary 54 of the autotransformer 20. The step-up ratio of the autotransformer being 1:5, a kv., high frequency pulse is provided to the lamp. The negative coefiicient of resistance of the lamp after starting causes the arc drop across the lamp to fall below 100 volts after ignition, thus stopping the operation of the pulse generating circuit, since zener diode 45 does not trigger the gate of silicon controlled rectifier 38. The 10 joules of energy stored in the storage capacitor 29 serves to maintain operation of the lamp and develop a hot spot on the cathode, until the voltagedrop across the lamp falls below the source voltage. At this point the source voltage takes over operation of the lamp through current limiting resistor ballast 16 and high current rectifier 18. The efiect of conductor 55 is such that when the current drawn by the lamp l1 rises to approximately amperes the operation of the inverter rectifier 2s ceases and no further charging of the storage capacitor 29 takes place during operation of the lamp.
While the invention has been specifically disclosed and the preferred embodiment thereof shown, it should be understood that the invention may be widely modified within the spirit and scope of the appended claims.
What is claimed as new and desired to be secured by Letters Patent of the United States is:
1. A pulse generating circuit for a dischargelamp requiring a high voltage pulse for initiating conduction ductive including an operating capacitor and a ringing therein comprising, a discharge lamp, a controlled rectifier connected to a pulsating current source and having a control electrode, means for rendering said controlled rectifier conductive including a zener diode connected to the source and to the control electrode and means including an operating capacitor responsive to the controlled rectifier when it is rendered conductive for delivering a high voltage pulse to the lamp.
2. A pulse generating circuit for a discharge lamp requiring a high voltage pulse for initiating conduction therein comprising, a discharge lamp, a silicon controlled rectifier connected to a pulsating current source and having a control electrode, means for rendering said controlled rectifier conductive including an electron control device which becomes conductive upon the application of a predetermined voltage level connected to the source and to the control electrode of the silicon controlled rectifier and means including an operating capacitor and a stepup transformer responsive to the controlled rectifier when it is rendered conductive for delivering a high voltage pulse to the lamp.
3. A pulse generating circuit for a discharge lamp requiring a high voltage pulse for initiating conduction therein comprising, a discharge lamp, a silicon controlled rectifier connected to a pulsating current source and having a control electrode, means for rendering said controlled rectifier conductive including an electron control device which becomes conductive upon the application of a predetermined voltage. level connected to. the source and to the control electrode of the silicon controlled rectifier and means for delivering a high voltage pulse to the lamp when the controlled rectifier is rendered conductive including an operating capacitor, a step-up transformer connected to the output of said silicon controlled rectifier, a spark gap and asecond capacitor connected to said transformer, said second capacitor being charged from the operating capacitor prior to the breakdown of said spark gap.
4. A pulse generating circuit for a discharge lamp comprising, a discharge lamp, a controlled rectifier connected to a pulsating current source and having a control electrode, means for rendering said controlled rectifier conductive including a zener diode connected to the source and to the electrode of the controlled rectifier, an oscillating circuit for rendering said controlledrcctifier non-controde, means for rendering said controlled rectifier conductive connected to the source and to the control electrode of the controlled rectifier and means including a charging capacitor and a spark gap connected to the controlled rectifier and lamp and responsive to the controlled rectifier-when conductive for delivering a high voltage pulse to the lamp, said capacitor being charged to a predetermined voltage level prior to the breakdown of said spark gap.
Eieierences Cited by the Examiner UNITED STATES PATENTS 2,946,924 7/60 Gerlach et al 31s 241 2,975,331 3/61 Diaz etal 3152859X 3,049,642 8/62 Quinn 31s 206 DAVID J GALVIN, Primary Examiner.
JAMES D. KALLAM, Examiner.

Claims (1)

1. A PULSE GENERATING CIRCUIT FOR A DISCHARGE LAMP REQUIRING A HIGH VOLTAGE PULSE FOR INITIATING CONDUCTION THEREIN COMPRISING, A DISCHARGE LAMP, A CONTROLLED RECTIFIER CONNECTED TO A PULSATING CURRENT SOURCE AND HAVING A CONTROL ELECTRODE, MEANS FOR RENDERING SAID CONTROLLED RECTIFIER CONDUCTIVE INCLUDING A ZENER DIODE CONNECTED TO THE SOURCE AND TO THE CONTROL ELECTRODE AND MEANS INCLUDING AN OPERACTING CAPACITOR RESPONSIVE TO THE CONTROLLED RECTIFIER WHEN IT IS RENDERED CONDUCTIVE FOR DELIVERING A HIGH VOLTAGE PULSE TO THE LAMP.
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Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3323015A (en) * 1964-05-07 1967-05-30 Cons Electrodynamics Corp Power supply for a compact-arc lamp
US3334270A (en) * 1964-09-04 1967-08-01 Gen Electric Discharge lamp circuit
US3505563A (en) * 1965-03-10 1970-04-07 Ass Elect Ind Fluid fuel ignition combustion arrangement
US3510725A (en) * 1968-12-16 1970-05-05 Honeywell Inc Ignition circuit for an arc discharge lamp
US3530336A (en) * 1969-07-28 1970-09-22 Nasa High voltage pulse generator
US3675078A (en) * 1969-05-08 1972-07-04 Pichel Ind Inc Electronic lamp driving circuit for hand held lamp
US4723097A (en) * 1987-05-05 1988-02-02 General Electric Company Rapid restrike metal halide lamp and a method of operating such

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2946924A (en) * 1959-04-13 1960-07-26 Clevite Corp Capacitor discharge circuit
US2975331A (en) * 1959-12-16 1961-03-14 Engelhard Hanovia Inc Starting and operating circuit for high pressure arc lamps
US3049642A (en) * 1962-08-14 Firing circuit for ignition systems

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3049642A (en) * 1962-08-14 Firing circuit for ignition systems
US2946924A (en) * 1959-04-13 1960-07-26 Clevite Corp Capacitor discharge circuit
US2975331A (en) * 1959-12-16 1961-03-14 Engelhard Hanovia Inc Starting and operating circuit for high pressure arc lamps

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3323015A (en) * 1964-05-07 1967-05-30 Cons Electrodynamics Corp Power supply for a compact-arc lamp
US3334270A (en) * 1964-09-04 1967-08-01 Gen Electric Discharge lamp circuit
US3505563A (en) * 1965-03-10 1970-04-07 Ass Elect Ind Fluid fuel ignition combustion arrangement
US3510725A (en) * 1968-12-16 1970-05-05 Honeywell Inc Ignition circuit for an arc discharge lamp
US3675078A (en) * 1969-05-08 1972-07-04 Pichel Ind Inc Electronic lamp driving circuit for hand held lamp
US3530336A (en) * 1969-07-28 1970-09-22 Nasa High voltage pulse generator
US4723097A (en) * 1987-05-05 1988-02-02 General Electric Company Rapid restrike metal halide lamp and a method of operating such

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