EP0239420B1 - High frequency ballast for gaseous discharge lamps - Google Patents

High frequency ballast for gaseous discharge lamps Download PDF

Info

Publication number
EP0239420B1
EP0239420B1 EP87302692A EP87302692A EP0239420B1 EP 0239420 B1 EP0239420 B1 EP 0239420B1 EP 87302692 A EP87302692 A EP 87302692A EP 87302692 A EP87302692 A EP 87302692A EP 0239420 B1 EP0239420 B1 EP 0239420B1
Authority
EP
European Patent Office
Prior art keywords
circuit
voltage
power
frequency
switching means
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
EP87302692A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0239420A1 (en
Inventor
Thomas E. Dean
William H. Henrich
David M. Fischer
Lawrence J. Stratton
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.)
Advance Transformer Co
Original Assignee
Thomas Industries Inc
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 Thomas Industries Inc filed Critical Thomas Industries Inc
Priority to AT87302692T priority Critical patent/ATE71244T1/de
Publication of EP0239420A1 publication Critical patent/EP0239420A1/en
Application granted granted Critical
Publication of EP0239420B1 publication Critical patent/EP0239420B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime 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
    • H05B41/26—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
    • H05B41/282—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
    • H05B41/285—Arrangements for protecting lamps or circuits against abnormal operating conditions
    • H05B41/2851—Arrangements for protecting lamps or circuits against abnormal operating conditions for protecting the circuit against abnormal operating conditions
    • H05B41/2856—Arrangements for protecting lamps or circuits against abnormal operating conditions for protecting the circuit against abnormal operating conditions against internal abnormal circuit conditions
    • 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
    • H05B41/282—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
    • H05B41/285—Arrangements for protecting lamps or circuits against abnormal operating conditions
    • H05B41/2858—Arrangements for protecting lamps or circuits against abnormal operating conditions for protecting the lamp against abnormal operating conditions

Definitions

  • a desired crest factor can be obtained simply by using large inductors and capacitors to filter the line voltage, but the power requirements of these components make the expensive and somewhat bulky, despite operation at higher frequencies.
  • winding 19 of transformer 15 couples power fed from the source lines 10 to a second bridge rectifier circuit 61, the output of which is connected to a storage capacitor 62.
  • the other output terminal of the bridge circuit 61 is connected through a resistor 63 to ground; and a high frequency by-pass capacitor 64 is connected across the storage capacitor 62.
  • a diode 65 couples the make-up voltage source to the input terminal 13 of the power transformer.
  • the minimum frequency oscillator 95 includes a capacitor 96 having one terminal grounded and the other terminal connected to the low voltage power source through a diode designated 99 of a reverse polarity, and it is also connected to the B+ voltage through a resistor 100.
  • the positive terminal of capacitor 96 is also connected through a resistor 101 to the output of a comparator circuit 102.
  • a comparator circuit 103 has its positive input connected to the previously described reference voltage generated across the diode 91 (as is the negative input of the comparator 102).
  • the negative input of comparator 103 is connected to the positive terminal of the capacitor 96.
  • the set point voltage, V ST.PT. is generated across a capacitor 108, the positive terminal of which is connected to the movable arm of a potentiometer generally designated 109.
  • a fixed resistor 110 is connected in series with the fixed resistor of the potentiometer 109 to the reference voltage developed across zener diode 91. As previously mentioned, the set point voltage is fed to the positive input of the comparator 42.
  • the normal operation of the circuit proceeds as follows. Assuming the power switch 30 has just been switched to a conducting state, the voltage at the junction 32 increases as current flows through resistor 33. That voltage signal is fed through resistor 67 to the negative input of comparator 42, the positive input of which is at the fixed set point voltage.
  • resistor 69 is connected between the B+ voltage terminal 13 and the inverting input of comparator 42. As the B+ voltage becomes greater, more current is fed through resistor 69, causing comparator 42 to change states earlier than otherwise would occur, and thereby compensating for the overshooting current mentioned above.
  • the frequency of operation of the inverter increases and decreases, but the peak value of current flowing in the primary (and secondary) of the power transformer 223 is substantially constant.
  • the leakage reactance of the power transformer is such as to present an increased impedance so that the peak value of load current also remains substantially constant and the crest factor of load current remains below a desired value.

Landscapes

  • Circuit Arrangements For Discharge Lamps (AREA)
  • Inverter Devices (AREA)
EP87302692A 1986-03-28 1987-03-27 High frequency ballast for gaseous discharge lamps Expired - Lifetime EP0239420B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT87302692T ATE71244T1 (de) 1986-03-28 1987-03-27 Hochfrequenz-vorschaltgeraet fuer gasentladungslampen.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US84585386A 1986-03-28 1986-03-28
US845853 1986-03-28

Publications (2)

Publication Number Publication Date
EP0239420A1 EP0239420A1 (en) 1987-09-30
EP0239420B1 true EP0239420B1 (en) 1992-01-02

Family

ID=25296241

Family Applications (1)

Application Number Title Priority Date Filing Date
EP87302692A Expired - Lifetime EP0239420B1 (en) 1986-03-28 1987-03-27 High frequency ballast for gaseous discharge lamps

Country Status (6)

Country Link
EP (1) EP0239420B1 (ja)
JP (1) JPS63999A (ja)
AT (1) ATE71244T1 (ja)
AU (1) AU609388B2 (ja)
CA (1) CA1327991C (ja)
DE (1) DE3775588D1 (ja)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6172468B1 (en) 1997-01-14 2001-01-09 Metrolight Ltd. Method and apparatus for igniting a gas discharge lamp

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4873471A (en) * 1986-03-28 1989-10-10 Thomas Industries Inc. High frequency ballast for gaseous discharge lamps
JPH07118394B2 (ja) * 1987-06-15 1995-12-18 松下電工株式会社 放電灯点灯装置
DE3742921A1 (de) * 1987-12-17 1989-06-29 Pintsch Bamag Ag Vorschaltgeraet fuer eine entladungslampe
JPH01186790A (ja) * 1988-01-18 1989-07-26 Mitsubishi Electric Corp 放電ランプの点灯装置
DE69016815T2 (de) * 1989-04-14 1995-09-07 Tlg Plc Vorschaltgeräte für Gasentladungslampen.
US5345164A (en) * 1993-04-27 1994-09-06 Metcal, Inc. Power factor corrected DC power supply
EP0677982B1 (de) * 1994-04-15 2000-02-09 Knobel Ag Lichttechnische Komponenten Verfahren zum Betrieb eines Vorschaltgeräts für Entladungslampen

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH637251A5 (de) * 1978-12-22 1983-07-15 Contrinex Sa Stromversorgungsanordnung zur speisung einer induktiven oder ohmisch-induktiven last.
DE3142613A1 (de) * 1981-10-28 1983-05-05 Philips Patentverwaltung Gmbh, 2000 Hamburg Schaltungsanordnung zum zuenden und betrieb einer niederdruckquecksilberdampfentladungslampe
DE3149526A1 (de) * 1981-12-14 1983-06-23 Philips Patentverwaltung Schaltungsanordnung zum betrieb von hochdruck-gasentladungslampen
NL8201631A (nl) * 1982-04-20 1983-11-16 Philips Nv Gelijkstroom-wisselstroomomzetter voor het ontsteken en met wisselstroom voeden van een gas- en/of dampontladingslamp.
US4560908A (en) * 1982-05-27 1985-12-24 North American Philips Corporation High-frequency oscillator-inverter ballast circuit for discharge lamps
US4873471A (en) * 1986-03-28 1989-10-10 Thomas Industries Inc. High frequency ballast for gaseous discharge lamps

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6172468B1 (en) 1997-01-14 2001-01-09 Metrolight Ltd. Method and apparatus for igniting a gas discharge lamp

Also Published As

Publication number Publication date
EP0239420A1 (en) 1987-09-30
CA1327991C (en) 1994-03-22
JPS63999A (ja) 1988-01-05
AU609388B2 (en) 1991-05-02
ATE71244T1 (de) 1992-01-15
DE3775588D1 (de) 1992-02-13
AU7067187A (en) 1987-10-01

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