EP0056889A1 - Vereinfachte Spannungsquelle für Fluoreszenzlampen - Google Patents

Vereinfachte Spannungsquelle für Fluoreszenzlampen Download PDF

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Publication number
EP0056889A1
EP0056889A1 EP81300342A EP81300342A EP0056889A1 EP 0056889 A1 EP0056889 A1 EP 0056889A1 EP 81300342 A EP81300342 A EP 81300342A EP 81300342 A EP81300342 A EP 81300342A EP 0056889 A1 EP0056889 A1 EP 0056889A1
Authority
EP
European Patent Office
Prior art keywords
power source
lamp
primary winding
oscillator circuit
filaments
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.)
Withdrawn
Application number
EP81300342A
Other languages
English (en)
French (fr)
Inventor
Top-Ping Hwang
Chin-Liang Feng
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.)
Individual
Original Assignee
Individual
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 Individual filed Critical Individual
Priority to EP81300342A priority Critical patent/EP0056889A1/de
Publication of EP0056889A1 publication Critical patent/EP0056889A1/de
Withdrawn legal-status Critical Current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
    • H05B41/295—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 with preheating electrodes, e.g. for fluorescent lamps
    • H05B41/298—Arrangements for protecting lamps or circuits against abnormal operating conditions
    • H05B41/2981—Arrangements for protecting lamps or circuits against abnormal operating conditions for protecting the circuit against abnormal operating conditions
    • H05B41/2985—Arrangements for protecting lamps or circuits against abnormal operating conditions for protecting the circuit against abnormal operating conditions against abnormal lamp operating conditions

Definitions

  • the present invention relates to a simplified power source for fluorescent lamps and the like.
  • the usual fluorescent lamp circuit comprises a ballast circuit and a starter circuit to start and drive the fluorescent lamp for its illumination.
  • Mr John T. Pierce disclosed a "Power source for fluorescent lamps and the like" patented on June 10, 1975 (U.S. Patent No. 3,889,153) to have improved light output, lower power consumption and high reliability for fluorescent lamps.
  • the lamps are independently operated from the oscillator circuit so that several capacitors are provided to couple the electric energy from the oscillating power source with the lamps.
  • the object of the present invention is to provide a power source wherein the filaments of fluorescent lamps are connected in series with the transformer winding so that the primary winding of the transformer will be connected to the power source and oscillator circuit by means of the filaments and wherein the transformer winding itself will serve as an element of the oscillator circuit so as to simplify the whole circuit for lower construction cost and lower power consumption as well as to enhance safety because the circuit will be opened to stop oscillation and to prevent from occurring of high voltage when any lamp is removed from the circuit.
  • the power source circuit as shown in Figure 1 comprises a high frequency transformer TR which is composed of three windings, N1, N1A and N2.
  • Primary winding N1 of transformer TR is also an oscillating winding in that one end thereof is connected through contact 5, filament Fl of a fluorescent lamp L1 and contact 6 to the collector of transistor Q of an oscillator circuit and in that another end thereof is connected through contact 11, filament F4 of a fluorescent lamp L2 and contact 12 to-the positive electrode 4 of the power source.
  • Feed-back winding N2 is connected at one end to the positive electrode 4 of power source and connected at another end to the base of transistor Q through resistor R3 and capacitor C2 which are connected in parallel.
  • resistor R1 which is connected between the base and the emitter, and a capacitor C1 which is connected between the collector and the emitter of the transistor Q.
  • the emitter is connected to negative electrode 3 through a resistor R2.
  • the terminals 1, 2 are fed with alternating current at, for example, 115 volts.
  • the input current is rectified by rectifier RF and then smoothed by capacitor C3 to provide direct voltage across a resistor R4 which has terminals 3, 4.
  • the base of said transistor Q When the circuit is supplied with power, the base of said transistor Q will receive a positive bias to increase the current between the collector and the emitter thereof. The current passing through the filaments to primary winding N1 of transformer TR will be increased. However, the polarity of said feed-back winding N2 is such that the winding provides negative feed-back so as to choke the increasing current.
  • the transistor constitutes a transformer-coupled blocking oscillator, which oscillates at a frequency which is more than 20 KHZ. A high voltage is rapidly developed across the winding N1; the filaments of L1 and L 2 will accept the current supplied from N1 to heat the lamp tubes for rapid starting. The voltage across the winding N1 will instantly light up the lamps.
  • the present invention has the following advantages over the circuit shown in Pierce's patent:
  • the present invention has advantages of simpler construction, lower production cost, less maintenance, lower power consumption and greater safety than the circuit shown in Pierce's patent.
  • the lamps connected in the circuit may be further modified to three sets or more in accordance with the present invention.
  • the present.invention may be supplied with input voltage ranging from 6V to 300V by modifying the design data of the related components, such as: capacitance, resistance or number of windings.

Landscapes

  • Circuit Arrangements For Discharge Lamps (AREA)
EP81300342A 1981-01-26 1981-01-26 Vereinfachte Spannungsquelle für Fluoreszenzlampen Withdrawn EP0056889A1 (de)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP81300342A EP0056889A1 (de) 1981-01-26 1981-01-26 Vereinfachte Spannungsquelle für Fluoreszenzlampen

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP81300342A EP0056889A1 (de) 1981-01-26 1981-01-26 Vereinfachte Spannungsquelle für Fluoreszenzlampen

Publications (1)

Publication Number Publication Date
EP0056889A1 true EP0056889A1 (de) 1982-08-04

Family

ID=8188199

Family Applications (1)

Application Number Title Priority Date Filing Date
EP81300342A Withdrawn EP0056889A1 (de) 1981-01-26 1981-01-26 Vereinfachte Spannungsquelle für Fluoreszenzlampen

Country Status (1)

Country Link
EP (1) EP0056889A1 (de)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2126810A (en) * 1982-09-06 1984-03-28 David John Martin Electronic drive circuit for discharge lamps
WO1985003835A1 (en) * 1984-02-16 1985-08-29 Fa. E-Integral Industrie-Elektronik Gmbh High frequency oscillating circuit for effecting a gas discharge and utilization thereof
EP0330118A2 (de) * 1988-02-22 1989-08-30 Patent-Treuhand-Gesellschaft für elektrische Glühlampen mbH Schaltungsanordnung zum Betrieb einer Niederdruckentladungslampe
US6111368A (en) * 1997-09-26 2000-08-29 Lutron Electronics Co., Inc. System for preventing oscillations in a fluorescent lamp ballast

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3882354A (en) * 1973-07-23 1975-05-06 Coleman Company Inverter ballast circuit for fluorescent lamp
US4008414A (en) * 1975-07-28 1977-02-15 Power Saver Corporation Circuit for powering fluorescent lamps
US4071807A (en) * 1976-08-13 1978-01-31 Yoshinobu Ichinose Fluorescent lamp lighting device

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3882354A (en) * 1973-07-23 1975-05-06 Coleman Company Inverter ballast circuit for fluorescent lamp
US4008414A (en) * 1975-07-28 1977-02-15 Power Saver Corporation Circuit for powering fluorescent lamps
US4071807A (en) * 1976-08-13 1978-01-31 Yoshinobu Ichinose Fluorescent lamp lighting device

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2126810A (en) * 1982-09-06 1984-03-28 David John Martin Electronic drive circuit for discharge lamps
WO1985003835A1 (en) * 1984-02-16 1985-08-29 Fa. E-Integral Industrie-Elektronik Gmbh High frequency oscillating circuit for effecting a gas discharge and utilization thereof
EP0330118A2 (de) * 1988-02-22 1989-08-30 Patent-Treuhand-Gesellschaft für elektrische Glühlampen mbH Schaltungsanordnung zum Betrieb einer Niederdruckentladungslampe
EP0330118A3 (de) * 1988-02-22 1991-02-27 Patent-Treuhand-Gesellschaft für elektrische Glühlampen mbH Schaltungsanordnung zum Betrieb einer Niederdruckentladungslampe
US6111368A (en) * 1997-09-26 2000-08-29 Lutron Electronics Co., Inc. System for preventing oscillations in a fluorescent lamp ballast

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PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

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Effective date: 19830202

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18D Application deemed to be withdrawn

Effective date: 19840801