US3917976A - Starting and operating circuit for gaseous discharge lamps - Google Patents

Starting and operating circuit for gaseous discharge lamps Download PDF

Info

Publication number
US3917976A
US3917976A US50063174A US3917976A US 3917976 A US3917976 A US 3917976A US 50063174 A US50063174 A US 50063174A US 3917976 A US3917976 A US 3917976A
Authority
US
Grant status
Grant
Patent type
Prior art keywords
voltage
means
lamp
circuit
discharge
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
Inventor
Joe A Nuckolls
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.)
General Electric Co
Original Assignee
General Electric Co
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
Grant date

Links

Images

Classifications

    • HELECTRICITY
    • H05ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05BELECTRIC HEATING; ELECTRIC LIGHTING NOT OTHERWISE PROVIDED FOR
    • H05B41/00Circuit arrangements or apparatus for igniting or operating discharge lamps
    • H05B41/02Details
    • H05B41/04Starting switches
    • H05B41/042Starting switches using semiconductor devices
    • YGENERAL 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
    • Y10TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10STECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S315/00Electric lamp and discharge devices: systems
    • Y10S315/05Starting and operating circuit for fluorescent lamp

Abstract

Operating circuits for gaseous discharge lamps, such as those of metal vapor type, having ballast devices of conventional type are provided with high voltage generating means for applying high voltage starting pulses on the lamp. The circuits comprise a charging capacitor and a voltage sensitive switch device forming a series discharge loop with a selected number of turns of the ballast coil winding at its output end, a resistor in series with the capacitor, and a choke coil in series with the resistor to provide improved ignition voltage and energy for starting lamps of relatively low operating voltage.

Description

i 1 STARTING AND OPERATING CIRCUIT FOR GASEOUS DISCHARGE LAMPS [75] Inventor; Joe A. Nuckolls, Hendersonville,

[73] Assignee: General Electric Company 22 Filed: Aug. 26, 1974 {21] Appl. No: 500,631

Related US. Application Data [63] Continuation-in-part of Scr, No, 674,508, Oct, 11,

1967, abandoned.

[52] US. Cl. H 315/258; 3l5/DIG. 5; 315/183; 315/208; 315/240; 315/283 [51] Int. Cl. H058 41/16 [58] Field of Search 3l5/D1G. 5, 183, 208, 239, 315/240, 258, 283, 362

[56] References Cited UNlTED STATES PATENTS 3364.386 H1968 Segawa et al1 1. 3l5/DlGt 5 3,522,475 8/1970 Hashirnoto 315/239 Primary Examiner-R. V. Rolinec Assistant Examiner-Lawrence J Dahl Attorney, Agent, or Firm-Sidney Greenberg [57] ABSTRACT Operating circuits for gaseous discharge lamps, such as those of metal vapor type, having ballast devices of conventional type are provided with high voltage generating means for applying high voltage starting pulses on the lamp. The circuits comprise a charging capacitor and a voltage sensitive switch device forming a series discharge loop with a selected number of turns of the ballast coil winding at its output end, a resistor in series with the capacitor, and a choke coil in series with the resistor to provide improved ignition voltage and energy for starting lamps of relatively low operating voltage.

9 Claims, 2 Drawing Figures STARTING AND OPERATING CIRCUIT FOR GASEOUS DISCHARGE LAMPS This application is a continuation-impart of eo-pending application Ser. No, 674,508 filed Oct. ll, I967, now abandoned, and assigned to the same assignee as the present invention.

The present invention relates to discharge lamp operating and starting circuits and especially to discharge lamps requiring a starting voltage substantially higher than the operating voltage.

It is an object of the invention to provide a simple, reliable, and economical starting and operating circuit for gaseous discharge lamps which require high starting voltages.

It is a particular object of the invention to provide a starting and operating circuit for discharge lamps of the above described type which have relatively low operating voltage and input voltage from which it is relatively difficult to generate high ignition voltage.

It is still another object of the invention to provide a starting circuit of the described type which is slaved to the lamp instantaneous ignition requirements and which automatically ceases operation once the lamp has started.

Other objects and advantages will become apparent from the following description and the appended claims.

With the above objects in view, the present invention relates to a starting and operating circuit for gaseous discharge lamps comprising a source of alternating current, ballasting means connected at its input side to the alternating current source, discharge lamp means connected to the output side of the ballasting means, and high voltage starting means including a portion of the ballasting means connected to the latter at it output side for providing a high voltage starting pulse on the discharge lamp means, the high voltage starting means comprising a charging capacitor and a resistor connected in series across the discharge lamp means, voltage sensitive switch means having a predetermined breakdown voltage connected across the charging capacitor and the portion of the ballasting means and forming a series discharge loop therewith for generating high frequency starting pulses, and induction means connected in series with the charging capacitor and the resistor for providing effective impedance to the high frequency starting pulses generated by the series discharge loop.

The invention will be better understood from the following description taken in conjunction with the accompanying drawing, in which:

FIG. I is a circuit diagram ofa lamp starting and operating circuit in which the invention is embodied; and

FIG. 2 is a circuit diagram of a modification of the FIG. I circuit.

Referring now to the drawing, and particularly to FIG. 1, there is shown a starting and operating circuit for a gaseous discharge lamp 1, such as a sodium or other metal vapor lamp, which requires a relatively high voltage pulse in order to be ignited and which thereafter operates on a lower voltage. Lamp 1 is connected by line conductors 3 and 4 across terminals 2 of an alternating current source, with inductive reactance ballast 5 connected in series therewith to provide a current limiting impedance, as is conventional in discharge lamp circuits. In order to provide high voltage starting pulses, e.g., of 2 or 3 kilovolts, on lamp 1, there is provided in the FIG. I embodiment a high voltage pulse generator comprising capacitor 6 and resistor 7 connected in series across lamp 1 on the output side of re' actor 5, and a voltage sensitive symmetrical switch 8, such as a neon glow lamp, which is a bi-laterally conducting gas tube and which becomes conductive only upon application of a predetermined voltage thereon. Other types of voltage sensitive bi-laterally conducting switch devices may be used instead of a neon glow lamp, as, for example, oppositely poled parallel connected controlled rectifiers, Shockley diodes, triacs (a-c semiconductor switch with single control electrode) or other equivalent switch devices or circuits. As shown, glow lamp 8 is connected across capacitor 6 and a predetermined number of turns 9 of reactor ballast 5 at the output end thereof, so that glow lamp 8 is in series discharge relation with capacitor 6 and the tapped turns 9 of ballast 5 in series therewith.

The number of turns thus tapped off at the output end should be sufficient to completely couple in an auto-transformer action the high voltage across the entire winding of reactor 5. The actual number of turns involved dictates the pulse inductance of the discharge loop. If the inductance is too small, the peak current in the discharge loop is too large, resulting in high resistance voltage drops around the loop and high switch losses, thus lowering the high voltage magnitude and energy level applied to lamp I. In a typical arrangement in the embodiment illustrated, the ratio oftotal turns to tapped turns selected may be about 30 to l, which usually suffices to provide good coupling and adequate peak output voltage for starting lamp I.

Connected across terminals 2 at the input side of reactor ballast 5 is capacitor 10 which serves both as a high frequency bypass and a power factor improvement capacitor. Such a capacitor, however, is not always necessary.

In the operation of the described circuit, capacitor 6 is initially charged through resistor 7 by the input voltage from the alternating current source. As the voltage across capacitor 6 rises, it reaches the breakdown potential of neon glow lamp 8. When this occurs, capaci tor 6 discharges through tapped turns 9 placing, say, 275 volts across those turns, resulting in a step-up by reactor 5 acting as a pulse transformer to a voltage of, say, about 3300 volts which appears across the total reactor turns. Pulses of this high voltage level are thereby produced across lamp 1 by the pulse generating circuit described. The line side of reactor 5 is shorted at the pulse frequency by capacitor I0. Since the pulse voltage cannot rise across capacitor I0, it must rise across resistor 7. Hence the pulse voltage appears across discharge lamp 1 in the correct polarity on each half cycle until lamp 1 starts. Upon starting of lamp 1, the pulsing mechanism is disabled as a result of the voltage clamping action of the ignited lamp load and therefore the voltage buildup across capacitor 6 does not reach the breakdown level of neon lamp 8.

In the use of a circuit such as thus described, a difficulty is encountered where lamp 1 is of a type which has a relatively low operating voltage, such as a I50 watt high pressure sodium vapor lamp of known type, as compared to 400 watt or 250 watt gaseous discharge lamps of the same type. Whereas the 150 watt lamp has an operating voltage of about 55 volts, and in the circuit shown should have relatively low open-circuit-voltage such as volts to provide stable lamp operation,

the 400 watt and 250 watt lamps have operating voltages of about lUU volts and are typically operated at open-circuibvoltages of 208 volts or more. Where a low operating voltage lamp such as described is used, it is not feasible in the described circuit to adjust the value of resistor 7 in order to provide the necessary high voltage to ignite the lamp. Thus, if the value of resistor 7 is made relatively low in order to charge capaci tor 6 to a sufficiently high voltage to start the lamp, the resistor constitutes a load on the circuit which reduces the ignition voltage to an excessively low level which is insufficient to start the lamp. On the other hand, if resister 7 has too high a value, capacitor 6 does not become charged to a sufficiently high level to start the lamp.

in accordance with the present invention, these problems are overcome by placing an inductor 11, specifically a radio frequency choke (RFC) coil, in series with resistor 7 as shown in FIG. I. Inductor 11 presents a high impedance to the high frequency starting pulses generated by operation of the described series discharge loop, and a result sufficient impedance is pro vided during that operation to prevent undue loading of the starting pulse, Furthermore, inductor ll exhibits a low impedance to the 60 cycle current charging capacitor 6, and thus allows the capacitor to charge to the desired level.

In general, the described circuit is particularly useful for lamps having an operating voltage of about 45 to 65 volts, and wherein the open circuit voltage across the lamp is about 105 to 125 volts.

FIG. 2 shows the invention as employed in a lamp operating circuit having a different high voltage generating circuit. In this embodiment, a triac l2 replaces neon tube 8 and its control (gate) electrode 120 is connected to a voltage sensitive triggering device 13, such as the silicon bi-lateral switch (SBS) shown, or a bi-lateral trigger diode (diac). The firing of triac 12 is cort trolled in the illustrated embodiment by a circuit comprising resistor 14 and resistor 15 connected in series across triac [2, with S85 13 connected to the junction of resistor 14 and resistor l5, and capacitor l6 connected across resistor 15, so that triac 12, its gate electrode 120, SE [3 and capacitor 16 form a series discharge loop. This circuit provides for proper phase control of the triac firing so that the starting pulses occur at the optimum time in the alternating current cycle. it being understood by those skilled in the art that the timing of the trigger operation will be dependent upon the relative values of resistor 14 and resistor 15.

ln a typical circuit such as shown in FIG. 2, the components listed below will have the following values:

Triac l2 RCA No. 4066) 55$ [3 GE No. 2N4992 Capacitor I6 012 mfd 5'71. 100 VDC Resistor [4 68K ohms 1 5 new Resistor l5 5.6K ohms 5%, VzW

Capacitor 6 0.47 mfd t 400 VDC Resistor 7 33K ohms :t 5%, SW

RFC coil ll l2 mh, 35 mu Ballast 5 30 ohms, 3.3 amps, 247 turns total Ballast turns 9 8 turns While the invention has been described in connection with the use of bilateral (symmetrical) switches for providing starting pulses on each halfcycle it will be understood that, where desired or appropriate for providing starting pulses only on alternate halfcycles, a

unidirectional switch such as an SCR may be used in place of triac l2, and a unidirectional trigger device such as a Shockley diode would then be used in place of S 13.

It will also be understood that the positions of capaci tor 6 and switch 8 may be interchanged in appropriate situations where this is desired.

It will further be understood that various forms of inductive ballast devices could be used in the described circuit instead of the reactor ballast shown, as for example, the ballasts shown in the aforementioned c0- pending application, and accordingly the disclosure of the latter application relating to such other ballasts and associated parts is incorporated by reference herein.

Although the invention has particular utility where lamps of relatively low operating voltage are used, other types of lamps may be employed in the described circuits even though they operate at substantially higher voltages.

While the present invention has been described with reference to particular embodiments thereof, it will be understood that numerous modifications may be made by those skilled in the art without actually departing from the scope of the invention. Therefore, the appended claims are intended to cover all such equivalent variations as come within the true spirit and scope of the invention.

What 1 claim as new and desired to secure by Letters Patent of the United States is:

l. A starting and operating circuit for gaseous discharge lamps comprising a source of alternating current, ballasting means connected at its input side to said alternating current source, discharge lamp means connected to the output side of said ballasting means, and high voltage starting means including a portion of said ballasting means connected to said ballasting means at its output side for providing a high voltage starting pulse on said discharge lamp means, said high voltage starting means comprising a charging capacitor and a resistor connected in series across said discharge lamp means, voltage sensitive switch means having a predetermined breakdown voltage connected across said charging capacitor and said portion of said ballasting means and forming a series discharge loop therewith for generating high frequency starting pulses, and induetion means connected in series with said charging capacitor and said resistor for providing rapid charging of said charging capacitor and effective impedance to the high frequency starting pulses generated by said series discharge loop.

2. A circuit as defined in claim 1, said ballasting means comprising inductance coil means having a plurality of turns, said portion of said ballasting means comprising a predetermined number of turns of said in ductance coil means at its output side, said inductance coil means stepping up the voltage produced across said predetermined number of turns by operation of said discharge loop.

3. A circuit as defined in claim I, said induction means comprising a radio frequency choke coil.

4.. A circuit as defined in claim 3, said voltage sensitive switch means comprising a controlled semiconductor switch having a control electrode, and voltage sensitive trigger means connected to said control electrode and said charging capacitor for triggering the operation of said controlled switch.

5.. A circuit as defined in claim 4, wherein said switch means comprises a bi-lateral conducting switch and 7. A circuit as defined in claim 1, including a high frequency by-pass capacitor connected across said alternating current source on the input side of said ballasting meansv 8. A circuit as defined in claim I, wherein said dis charge lamp means comprises a lamp having an operat ing voltage of about 45 to 65 volts,

9. A circuit as defined in claim 8, wherein the opencircuit-voltage across said lamp is about to l25 volts.

Claims (9)

1. A starting and operating circuit for gaseous discharge lamps comprising a source of alternating current, ballasting means connected at its input side to said alternating current source, discharge lamp means connected to the output side of said ballasting means, and high voltage starting means including a portion of said ballasting means connected to said ballasting means at its output side for providing a high voltage starting pulse on said discharge lamp means, said high voltage starting means comprising a charging capacitor and a resistor connected in series across said discharge lamp means, voltage sensitive switch means having a predetermined breakdown voltage connected across said charging capacitor and said portion of said ballasting means and forming a series discharge loop therewith for generating high frequency starting pulses, and induction means connected in series with said charging capacitor and said resistor for providing rapid charging of said charging capacitor and effective impedance to the high frequency starting pulses generated by said series discharge loop.
2. A circuit as defined in claim 1, said ballasting means comprising inductance coil means having a plurality of turns, said portion of said ballasting means comprising a predetermined number of turns of said inductance coil means at its output side, said inductance coil means stepping up the voltage produced across said predetermined number of turns by operation of said discharge loop.
3. A circuit as defined in claim 1, said induction means comprising a radio frequency choke coil.
4. A circuit as defined in claim 3, said voltage sensitive switch means comprising a controlled semiconductor switch having a control electrode, and voltage sensitive trigger means connected to said control electrode and said charging capacitor for triggering the operation of said controlled switch.
5. A circuit as defined in claim 4, wherein said switch means comprises a bi-lateral conducting switch and said triggering means comprises a voltage sensitive bi-lateral conducting device.
6. A circuit as defined in claim 4, said trigger means comprising a circuit for triggering the operation of said controlled switch at a predetermined time in each cycle, said circuit comprising resistance means connected across said switch means, a voltage sensitive trigger device connected to said control electrode and said resistance means, and capacitance means connected to said trigger device and said switch means so as to form a series discharge loop therewith.
7. A circuit as defined in claim 1, including a high frequency by-pass capacitor connected across said alternating current source on the input side of said ballasting means.
8. A circuit as defined in claim 1, wherein said discharge lamp means comprises a lamp having an operating voltage of about 45 to 65 volts.
9. A circuit as defined in claim 8, wherein the open-circuit-voltage across said lamp is about 105 to 125 volts.
US3917976A 1967-10-11 1974-08-26 Starting and operating circuit for gaseous discharge lamps Expired - Lifetime US3917976A (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
US67450867 true 1967-10-11 1967-10-11
US3917976A US3917976A (en) 1967-10-11 1974-08-26 Starting and operating circuit for gaseous discharge lamps

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
US3917976A US3917976A (en) 1967-10-11 1974-08-26 Starting and operating circuit for gaseous discharge lamps
JP13778274A JPS5624999B2 (en) 1974-08-26 1974-12-03
ES433936A ES433936A1 (en) 1974-08-26 1975-01-18 Improvements in the construction of a circuit for starting and operating gas discharge lamps.
CA 231458 CA1060945A (en) 1974-08-26 1975-07-14 Starting and operating circuit for gaseous discharge lamps

Publications (1)

Publication Number Publication Date
US3917976A true US3917976A (en) 1975-11-04

Family

ID=27053576

Family Applications (1)

Application Number Title Priority Date Filing Date
US3917976A Expired - Lifetime US3917976A (en) 1967-10-11 1974-08-26 Starting and operating circuit for gaseous discharge lamps

Country Status (1)

Country Link
US (1) US3917976A (en)

Cited By (34)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4005336A (en) * 1975-01-03 1977-01-25 Gte Sylvania Incorporated High intensity discharge lamp starting circuit
US4015167A (en) * 1974-07-02 1977-03-29 The General Electric Company Limited Circuits for operating electric discharge lamps
US4072878A (en) * 1975-01-10 1978-02-07 Westinghouse Electric Corporation Starting and operating apparatus for high pressure sodium lamp ballasts
US4101809A (en) * 1977-05-26 1978-07-18 General Electric Company Discharge lamp operating circuit
US4143304A (en) * 1976-10-06 1979-03-06 Westinghouse Electric Corp. Positive starting and operating apparatus for high-pressure sodium lamps
US4209730A (en) * 1978-07-14 1980-06-24 Larry McGee Company Starting circuit for gaseous discharge lamps
US4210850A (en) * 1977-06-27 1980-07-01 The General Electric Company Limited Circuits for operating electric discharge lamps
US4275337A (en) * 1979-08-08 1981-06-23 General Electric Company Starting and operating circuit for gaseous discharge lamps
US4322660A (en) * 1980-06-20 1982-03-30 Westinghouse Electric Corp. Starting and operating apparatus for high-pressure sodium lamps
US4323821A (en) * 1980-01-30 1982-04-06 Central Electrical Company Luminaire converter
US4337417A (en) * 1980-08-14 1982-06-29 Westinghouse Electric Corp. Starting and operating apparatus for high-pressure sodium lamps
FR2537348A1 (en) * 1982-12-03 1984-06-08 Gen Electric Connector has multiple functions
US4527098A (en) * 1983-01-28 1985-07-02 General Electric Company Discrete starter for HID lamp
US4572988A (en) * 1983-08-22 1986-02-25 Industrial Design Associates, (Ida) High frequency ballast circuit
US4601765A (en) * 1983-05-05 1986-07-22 General Electric Company Powdered iron core magnetic devices
US4601753A (en) * 1983-05-05 1986-07-22 General Electric Company Powdered iron core magnetic devices
US4724362A (en) * 1985-12-23 1988-02-09 Gte Products Corporation High frequency lamp igniter using a spiral line pulse generator in combination with a series inductor-switch circuit
US4763044A (en) * 1986-01-23 1988-08-09 Hubbell Incorporated Start, hot restart and operating lamp circuit
US4795945A (en) * 1987-05-07 1989-01-03 The Forest Electric Company Starting circuit for high intensity gaseous discharge lamps
US4808888A (en) * 1986-11-28 1989-02-28 Gte Products Corporation Starting circuit for gaseous discharge lamps
US4866347A (en) * 1987-09-28 1989-09-12 Hubbell Incorporated Compact fluorescent lamp circuit
US4902943A (en) * 1982-12-03 1990-02-20 General Electric Company Plug-in starting aid
US4931699A (en) * 1989-01-06 1990-06-05 General Electric Company Ballast system including a starting aid for a gaseous discharge lamp
US4950961A (en) * 1986-11-28 1990-08-21 Gte Products Corporation Starting circuit for gaseous discharge lamps
US5047694A (en) * 1989-06-30 1991-09-10 Hubbell Incorporated Lamp starting circuit
US5210471A (en) * 1991-10-18 1993-05-11 Hubbell Incorporated Controlled-current lamp starting ciruit
US5594308A (en) * 1995-08-29 1997-01-14 Hubbell Incorporated High intensity discharge lamp starting circuit with automatic disablement of starting pulses
US5663612A (en) * 1996-04-30 1997-09-02 Hubbell Incorporated Apparatus for dimming discharge lamp having electromagnetic regulator with selectively tapped capacitance winding
US5825139A (en) * 1995-11-02 1998-10-20 Hubbell Incorporated Lamp driven voltage transformation and ballasting system
US5962988A (en) * 1995-11-02 1999-10-05 Hubbell Incorporated Multi-voltage ballast and dimming circuits for a lamp drive voltage transformation and ballasting system
US6104147A (en) * 1997-10-28 2000-08-15 Matsushita Electric Works, Ltd. Pulse generator and discharge lamp lighting device using same
US6114816A (en) * 1994-12-16 2000-09-05 Hubbell Incorporated Lighting control system for discharge lamps
US6597128B2 (en) 2001-10-03 2003-07-22 Hubbell Incorporated Remote discharge lamp ignition circuitry
US7705544B1 (en) 2007-11-16 2010-04-27 Universal Lighting Technologies, Inc. Lamp circuit with controlled ignition pulse voltages over a wide range of ballast-to-lamp distances

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3364386A (en) * 1964-11-09 1968-01-16 Tokyo Shibaura Electric Co Pulse generating means for starting discharge lamps
US3522475A (en) * 1967-06-29 1970-08-04 Matsushita Electric Works Ltd Discharge lamp starting device

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3364386A (en) * 1964-11-09 1968-01-16 Tokyo Shibaura Electric Co Pulse generating means for starting discharge lamps
US3522475A (en) * 1967-06-29 1970-08-04 Matsushita Electric Works Ltd Discharge lamp starting device

Cited By (36)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4015167A (en) * 1974-07-02 1977-03-29 The General Electric Company Limited Circuits for operating electric discharge lamps
US4005336A (en) * 1975-01-03 1977-01-25 Gte Sylvania Incorporated High intensity discharge lamp starting circuit
US4072878A (en) * 1975-01-10 1978-02-07 Westinghouse Electric Corporation Starting and operating apparatus for high pressure sodium lamp ballasts
US4143304A (en) * 1976-10-06 1979-03-06 Westinghouse Electric Corp. Positive starting and operating apparatus for high-pressure sodium lamps
US4101809A (en) * 1977-05-26 1978-07-18 General Electric Company Discharge lamp operating circuit
US4210850A (en) * 1977-06-27 1980-07-01 The General Electric Company Limited Circuits for operating electric discharge lamps
US4209730A (en) * 1978-07-14 1980-06-24 Larry McGee Company Starting circuit for gaseous discharge lamps
US4275337A (en) * 1979-08-08 1981-06-23 General Electric Company Starting and operating circuit for gaseous discharge lamps
US4323821A (en) * 1980-01-30 1982-04-06 Central Electrical Company Luminaire converter
US4322660A (en) * 1980-06-20 1982-03-30 Westinghouse Electric Corp. Starting and operating apparatus for high-pressure sodium lamps
US4337417A (en) * 1980-08-14 1982-06-29 Westinghouse Electric Corp. Starting and operating apparatus for high-pressure sodium lamps
FR2537348A1 (en) * 1982-12-03 1984-06-08 Gen Electric Connector has multiple functions
US4472015A (en) * 1982-12-03 1984-09-18 General Electric Company Multifunction connector
US4902943A (en) * 1982-12-03 1990-02-20 General Electric Company Plug-in starting aid
US4527098A (en) * 1983-01-28 1985-07-02 General Electric Company Discrete starter for HID lamp
US4601765A (en) * 1983-05-05 1986-07-22 General Electric Company Powdered iron core magnetic devices
US4601753A (en) * 1983-05-05 1986-07-22 General Electric Company Powdered iron core magnetic devices
US4572988A (en) * 1983-08-22 1986-02-25 Industrial Design Associates, (Ida) High frequency ballast circuit
US4724362A (en) * 1985-12-23 1988-02-09 Gte Products Corporation High frequency lamp igniter using a spiral line pulse generator in combination with a series inductor-switch circuit
US4763044A (en) * 1986-01-23 1988-08-09 Hubbell Incorporated Start, hot restart and operating lamp circuit
US4808888A (en) * 1986-11-28 1989-02-28 Gte Products Corporation Starting circuit for gaseous discharge lamps
US4950961A (en) * 1986-11-28 1990-08-21 Gte Products Corporation Starting circuit for gaseous discharge lamps
US4795945A (en) * 1987-05-07 1989-01-03 The Forest Electric Company Starting circuit for high intensity gaseous discharge lamps
US4866347A (en) * 1987-09-28 1989-09-12 Hubbell Incorporated Compact fluorescent lamp circuit
US4931699A (en) * 1989-01-06 1990-06-05 General Electric Company Ballast system including a starting aid for a gaseous discharge lamp
US5047694A (en) * 1989-06-30 1991-09-10 Hubbell Incorporated Lamp starting circuit
US5321338A (en) * 1989-06-30 1994-06-14 Hubbell Incorporated Lamp starting circuit
US5210471A (en) * 1991-10-18 1993-05-11 Hubbell Incorporated Controlled-current lamp starting ciruit
US6114816A (en) * 1994-12-16 2000-09-05 Hubbell Incorporated Lighting control system for discharge lamps
US5594308A (en) * 1995-08-29 1997-01-14 Hubbell Incorporated High intensity discharge lamp starting circuit with automatic disablement of starting pulses
US5825139A (en) * 1995-11-02 1998-10-20 Hubbell Incorporated Lamp driven voltage transformation and ballasting system
US5962988A (en) * 1995-11-02 1999-10-05 Hubbell Incorporated Multi-voltage ballast and dimming circuits for a lamp drive voltage transformation and ballasting system
US5663612A (en) * 1996-04-30 1997-09-02 Hubbell Incorporated Apparatus for dimming discharge lamp having electromagnetic regulator with selectively tapped capacitance winding
US6104147A (en) * 1997-10-28 2000-08-15 Matsushita Electric Works, Ltd. Pulse generator and discharge lamp lighting device using same
US6597128B2 (en) 2001-10-03 2003-07-22 Hubbell Incorporated Remote discharge lamp ignition circuitry
US7705544B1 (en) 2007-11-16 2010-04-27 Universal Lighting Technologies, Inc. Lamp circuit with controlled ignition pulse voltages over a wide range of ballast-to-lamp distances

Similar Documents

Publication Publication Date Title
US3493718A (en) Semi-conductor welding circuit
US3466500A (en) Control circuit for arc discharge device
US3265930A (en) Current level switching apparatus for operating electric discharge lamps
US3573544A (en) A gas discharge lamp circuit employing a transistorized oscillator
US3681654A (en) Light-regulating power supply circuit for gaseous discharge lamp
US4060751A (en) Dual mode solid state inverter circuit for starting and ballasting gas discharge lamps
US5223767A (en) Low harmonic compact fluorescent lamp ballast
US5313142A (en) Compact fluorescent lamp with improved power factor
US6459213B1 (en) Ballast for parallel-connected lamps
US4237403A (en) Power supply for fluorescent lamp
US3890537A (en) Solid state chopper ballast for gaseous discharge lamps
US5962988A (en) Multi-voltage ballast and dimming circuits for a lamp drive voltage transformation and ballasting system
US4127797A (en) Inverter oscillator with current feedback
US4350930A (en) Lighting unit
US4388563A (en) Solid-state fluorescent lamp ballast
US3944876A (en) Rapid starting of gas discharge lamps
US3119058A (en) Controlled rectifier inverter circuits
US4005336A (en) High intensity discharge lamp starting circuit
US4277726A (en) Solid-state ballast for rapid-start type fluorescent lamps
US5594308A (en) High intensity discharge lamp starting circuit with automatic disablement of starting pulses
US3222572A (en) Apparatus for operating electric discharge devices
US4507698A (en) Inverter-type ballast with ground-fault protection
US4168453A (en) Variable intensity control apparatus for operating a gas discharge lamp
US4896077A (en) Ignitor disabler
US5084653A (en) Power-line-isolated dimmable electronic ballast