US3771068A - Constant wattage autotransformer ballast for high pressure sodium lamp - Google Patents

Constant wattage autotransformer ballast for high pressure sodium lamp Download PDF

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Publication number
US3771068A
US3771068A US00320139A US3771068DA US3771068A US 3771068 A US3771068 A US 3771068A US 00320139 A US00320139 A US 00320139A US 3771068D A US3771068D A US 3771068DA US 3771068 A US3771068 A US 3771068A
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US
United States
Prior art keywords
ballast
capacitor
high pressure
pressure sodium
sustaining
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
US00320139A
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English (en)
Inventor
F Paget
J Avallon
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.)
GTE Sylvania Inc
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GTE Sylvania Inc
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Filing date
Publication date
Application filed by GTE Sylvania Inc filed Critical GTE Sylvania Inc
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Publication of US3771068A publication Critical patent/US3771068A/en
Anticipated expiration legal-status Critical
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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F38/00—Adaptations of transformers or inductances for specific applications or functions
    • H01F38/08—High-leakage transformers or inductances
    • H01F38/10—Ballasts, e.g. for discharge 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
    • H05B41/16—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

Definitions

  • ABSTRACT A ballast for a high pressure sodium lamp includes a constant wattage autotransformer with a series capacitor, of 10 microfarads for example, between the autotransformer secondary and one lamp terminal, and an arc sustaining capacitor of lower value connected in parallel with the secondary.
  • a ballast for high pressure sodium lamps comprises input terminals for connection to alternating current lines, output terminals for connection across a high pressure sodium lamp, a constant wattage autotransformer having a primary winding connected to the input terminals and one output terminal, and a secondary having a connection to the other output terminal, series capacitor in the connection to the other output terminal, and an arc sustaining ca'paci tor connected to one of, the input terminals in parallel with the secondary winding of the autotransformer and having a value to resonate therewith, whereby to produce afast rise in the voltage at the output terminals at the beginning of each alternating high cycle, thereby to sustain and stabilize the arc in a high pressure sodium lamp.
  • FIG. 5 is a graphcomparing HPS larnp voltages with prior and present CWA ballasts.
  • the typical I-IPS lamp installation of FIG. 1 comprises a ballast B sealed or potted in a housinglI-Il
  • the ballast has alternating current input terminals Aand C for connection to 1 volt lines and output terminals 1 and 2 for connection to a high pressure sodium lampL such as Sylvania Lumalux 2.
  • a high pressure sodium lampL such as Sylvania Lumalux 2.
  • one of the' lamp terminals, e.g., 2 is connected to'a common input terminal, e.g., C.
  • the ballast includes an autotransformer T having a primary winding T1 and secondaryTZ on a core having" an air gap G indicated by a conventional symbol.
  • Connected between the secondary T2 and one output terminal is a capacitor C1 usually of 10 or more microfarads value. Being connected in series with the transformer T and lamp L the capacitor C1 Iimitsor controls the lamp current and improves the power factor of the entire load, and is usually potted with the transformer T in the ballast H.
  • the CWA ballast described is practically incapable of starting or maintaining discharge of the I-IPS lamp and has been replaced with a reactor type ballast with a high voltage pulsing device.
  • a ballast will start and sustain an easy start lamp by the connection of an 0.1 to about 10 microfarad capacitor C2 to the ballast output terminal 1 and input terminal C in parallel with the secondary T2.
  • a sustaining capacitor C4 (as contrasted with the series capacitor C1) is connected be tween the output terminal 1 andinput terminal A.
  • the terminals 1, A and C are exposed externally of the ballast housing H and the connection of the sustaining capacitor C2 or C4 may be made in an existing CWA ballast installation without removing or unhousing the ballast.
  • CWA ballasts may be assembled with the sustaining capacitor in the housing.
  • a sustaining capacitor C3 is connected to the output end of the transformer secondary and the common input terminal C.
  • a sustaining capacitor C5 is connected directly across the secondary T2.
  • the sustaining capacitor is in parallel with the autotransform er secondary T2 and reacts with the secondary creating sharper transitions in the alternating voltage applied, to the lamp at the time when the alternating current passes through zero.
  • FIG. 5 shows the voltage applied by CWA ballast
  • the above described improved operation can be obtained with sustaining capacitors between 0.1 and approximately IO microfarads value. Below 0.1 microfarads the sustaining characteristic is weak; above 10 microfarads the expense and bulk of the sustaining capacitor outweigh any improvement in performance of the ballast.
  • a ballast for a high pressure sodium lamp comprismg:
  • a constant wattage autotransformer having a primary winding connected to the input terminals and one output terminal, and a secondary having a connection to the other output terminal
  • an arc sustaining capacitor connected to one of the input terminals in parallel with the secondary winding of the autotransformer and having a value to resonate therewith

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Circuit Arrangements For Discharge Lamps (AREA)
US00320139A 1973-01-02 1973-01-02 Constant wattage autotransformer ballast for high pressure sodium lamp Expired - Lifetime US3771068A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US32013973A 1973-01-02 1973-01-02

Publications (1)

Publication Number Publication Date
US3771068A true US3771068A (en) 1973-11-06

Family

ID=23245044

Family Applications (1)

Application Number Title Priority Date Filing Date
US00320139A Expired - Lifetime US3771068A (en) 1973-01-02 1973-01-02 Constant wattage autotransformer ballast for high pressure sodium lamp

Country Status (2)

Country Link
US (1) US3771068A (enrdf_load_stackoverflow)
JP (1) JPS49102175A (enrdf_load_stackoverflow)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0096105A3 (en) * 1981-10-01 1984-07-18 Fahir Gülüm Instant start solid state ballast for fluorescent and gas-dis charge lamps
US4777410A (en) * 1987-06-22 1988-10-11 Innovative Controls, Inc. Ballast striker circuit
US4999547A (en) * 1986-09-25 1991-03-12 Innovative Controls, Incorporated Ballast for high pressure sodium lamps having constant line and lamp wattage
US5497052A (en) * 1994-06-09 1996-03-05 Magnetek, Inc. Isolated constant wattage lamp ballast
US20140167904A1 (en) * 2012-12-17 2014-06-19 OV20 Systems Device and Method for Retrofitting or Converting or Adapting Series Circuits
US11206722B2 (en) 2017-09-01 2021-12-21 Trestoto Pty Limited Lighting control circuit, lighting installation and method

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6296299U (enrdf_load_stackoverflow) * 1985-12-06 1987-06-19

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2910623A (en) * 1956-06-15 1959-10-27 Mc Graw Edison Co Ballast construction
US3029363A (en) * 1958-08-11 1962-04-10 Jefferson Electric Co Ballast and system for gaseous discharge lamps

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2910623A (en) * 1956-06-15 1959-10-27 Mc Graw Edison Co Ballast construction
US3029363A (en) * 1958-08-11 1962-04-10 Jefferson Electric Co Ballast and system for gaseous discharge lamps

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0096105A3 (en) * 1981-10-01 1984-07-18 Fahir Gülüm Instant start solid state ballast for fluorescent and gas-dis charge lamps
US4999547A (en) * 1986-09-25 1991-03-12 Innovative Controls, Incorporated Ballast for high pressure sodium lamps having constant line and lamp wattage
US4777410A (en) * 1987-06-22 1988-10-11 Innovative Controls, Inc. Ballast striker circuit
US5497052A (en) * 1994-06-09 1996-03-05 Magnetek, Inc. Isolated constant wattage lamp ballast
US20140167904A1 (en) * 2012-12-17 2014-06-19 OV20 Systems Device and Method for Retrofitting or Converting or Adapting Series Circuits
US9554444B2 (en) * 2012-12-17 2017-01-24 OV20 Systems Device and method for retrofitting or converting or adapting series circuits
US11206722B2 (en) 2017-09-01 2021-12-21 Trestoto Pty Limited Lighting control circuit, lighting installation and method

Also Published As

Publication number Publication date
JPS49102175A (enrdf_load_stackoverflow) 1974-09-26

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