EP0247002A1 - Système électronique d'alimentation pour tubes fluorescents à électrodes - Google Patents

Système électronique d'alimentation pour tubes fluorescents à électrodes Download PDF

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Publication number
EP0247002A1
EP0247002A1 EP87810304A EP87810304A EP0247002A1 EP 0247002 A1 EP0247002 A1 EP 0247002A1 EP 87810304 A EP87810304 A EP 87810304A EP 87810304 A EP87810304 A EP 87810304A EP 0247002 A1 EP0247002 A1 EP 0247002A1
Authority
EP
European Patent Office
Prior art keywords
transistor
capacitor
resistor
transistors
series
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Withdrawn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
EP87810304A
Other languages
German (de)
English (en)
French (fr)
Inventor
Jean-Claude M. Harel
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.)
Interpatents Ltd
Original Assignee
Interpatents Ltd
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 Interpatents Ltd filed Critical Interpatents Ltd
Publication of EP0247002A1 publication Critical patent/EP0247002A1/fr
Withdrawn legal-status Critical Current

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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
    • H05B41/26—Circuit arrangements in which the lamp is fed by power derived from dc by means of a converter, e.g. by high-voltage dc
    • 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
    • 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
    • H05B41/2825—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 by means of a bridge converter in the final stage
    • 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
    • Y10S315/07—Starting and control circuits for gas discharge lamp using transistors

Definitions

  • the present invention relates to an electronic power supply system for fluorescent tubes with electrodes enabling almost instantaneous ignition as well as energy saving.
  • this assembly comprising a reactance
  • this assembly uses the opening of a bimetallic strip to initiate the gas mixture located between the filaments of the tube. This ignition is rarely instantaneous, which requires several openings of the bimetallic strip. These repeated openings have the effect of causing the tube to flash, which is detrimental to the life of the latter.
  • the reactance consumes a lot of energy, which results in heating of it.
  • this reactance introduces a significant reactivity rate into the sector line, which increases consumption accordingly.
  • One orientation among others illustrated for example in the presentation FR 2 520 575, uses two transistors connected in series amplifying a square signal supplied by an auxiliary frequency generator circuit and delivering it to a series oscillating circuit comprising a coil L1, a lighting unit and a charge capacitor C3.
  • This system was quickly improved by removing the related frequency generator circuit and replacing it with a transformer taking from the oscillating series circuit even a sinusoidal signal to drive the two transistors alternately.
  • This simple design system illustrated by the presentation FR 2 478 933, has two new drawbacks. On the one hand its starting is random, on the other hand short periods during which the transistors become simultaneously conducting are possible. During such periods, the lighting unit being no longer supplied with power goes out, and the transistors are traversed by a high intensity detrimental to their longevity.
  • the certain starting of the circuit is resolved for example by sending a starting pulse to one of the transistors.
  • This is achieved using a breakdown element, or diac, connected on the one hand to the base of the transistor whose emitter is connected to ground, on the other hand between a capacitor and a resistor mounted in series between the supply terminals and constituting a time base.
  • diac breakdown element
  • a resistor 51 short-circuits the transistor 11, in the presentation WO 87/00719, a special branch comprising a diode 17 and a parallel mounting of a capacitor 19 and a resistor 21 controls a switch 14 allowing the charging of the capacitor 15 through the capacitor 18, and in the description DE 3 412 944 a weak charging current passes through the diode 31 and the resistor 32.
  • the present invention aims to obviate the above-mentioned drawbacks by proposing an electronic power supply system for fluorescent tubes with electrodes delivering a high frequency voltage across said tubes, allowing instantaneous ignition. of these, having a very good yield and providing a reduction in energy consumption compared to the traditional assembly of 45 to 50%.
  • the system comprises a power supply connecting to the mains and producing a DC voltage on its output terminals 1A and 1B, a time constant connected between said output terminals made up of a circuit. series of a resistor and a capacitor, two power transistors connected in series between said output terminals, and, connected to the common point of the transistors, a series connection comprising the primary of a transformer, the unit or units lighting and a capacitor.
  • the two secondary transformers drive the transistors.
  • the system further includes a bilateral breakdown effect conduction element, or diac, connected on one side between the resistor and the time constant capacitor and on the other side on the control branch of the transistor, the one of the other branches is connected to the output terminal 1B.
  • This system is characterized in that the transistors are of the MOS type and that the capacitor in series with the lighting unit (s) is connected to the output terminal 1A so that it does not start to charge until the passage in the saturated state of the transistor under the impulse of the diac.
  • the power supply system for fluorescent electrode tubes comprises a power supply 1 connecting to the mains and producing a DC voltage on its terminals so 1A and 1B.
  • This supply 1 comprises in known manner between its input terminals a diode bridge 2 rectifying the alternating voltage of the network and between the output terminals of said diode bridge, a capacitor 3 preferably of the electrochemical type filtering the rectified voltage. Between the input terminals of the power supply 1 are mounted two capacitors 4 connected in parallel between the earth and one of the said input terminals. These capacitors 4 make it possible to eliminate the high frequency parasites generated by the system. On the other hand, a fuse 5 for protection against a possible short circuit is mounted on one of the power supply input terminals. On the other input terminal of the power supply is mounted a resistor 6 limiting the input intensity in the power supply.
  • time constant 7 constituted by the series connection of a resistor 8 and a capacitor 9.
  • the ignition system for fluorescent electrode tubes comprises a capacitive element 10 connected to the positive terminal 1A of the supply 1 and in series with at least one lighting unit 11, two groups of controls 12 of l state of charge of the capacitive element 10 through the lighting unit (s) and a transformer including the primary 13 is connected between the lighting unit (s) 11 and the control groups 12 and, depending on the load of the capacitive element 10, controlling the control groups 12.
  • the capacitive element 10 consists of a capacitor of known type.
  • control circuit of each MOS transistor 14, connected in series between the source S and the gate G of this transistor 14, comprises the secondary 15 of the transformer, a resistor 16 connected in series with the said secondary, and a Zener diode 17 mounted in parallel with the secondary series mounting 15 / resistor 16.
  • the secondary 15 of each of the control groups 12 come from the transformer and are mounted in phase opposition on the same core as the primary 13.
  • a control group 12, called the first group is mounted between the primary 13 of the transformer by the drain D of transistor 14 and terminal 1B of power supply 1 by source S of said transistor.
  • the other group 12, called the second group is mounted between the capacitive element 10 by the drain D of the transistor 14 and the primary 13 of the said transformer by the source S of the transistor.
  • two MOS type power transistors 14 are connected in series between the terminals 1A and 1B of the power supply.
  • the transistor of the first command group 12 is connected to terminal 1B by its source S.
  • the drain of the transistor 14 of the first command group 12 is connected to the source of the transistor 14 of the second command group.
  • the drain D of the transistor of the second group of commands is connected to the terminal 1A of the power supply.
  • a series branch comprises in order the primary 13 of the transformer, the lighting unit or units 11 and a charge capacitor 10, the latter being connected at terminal 1A of the power supply.
  • the circuit comprises a first series branch connected between the terminals of the power supply and comprising the transistor 14 of the first group of commands, the primary 13 of the transformer, the lighting unit or units 11 and the charge capacitor 10. This series connection is short-circuited between the primary 13 of the transformer and the capacitor 10 by the transistor 14 of the second group of commands.
  • a bilateral conduction element with breakdown effect or diac 18 is connected on one side between the resistor 8 and the capacitor 9 of the time constant 7 and on the other side on the gate G of the transistor 14 of the first group 12.
  • the capacitor 9 of the time constant 7 charges through the resistor 8 until the voltage at terminals of said capacitor 9 reaches the threshold voltage of diac 18 plus the low voltage existing between the gate and the source of transistor 14. Once this voltage is reached, diac 18 becomes conducting and said voltage is present on gate G of transistor 14 of the first group 12 which makes this transistor on. The conduction of this transistor causes the capacitor 10 to charge through the primary 13 of the transformer and the lighting unit (s).
  • Charging the capacitor 10 causes a voltage pulse across the transformer.
  • This voltage pulse transmitted by the primary 13 to the secondary 15 causes the change of polarization of the gates G of the transistors 14 of the first and second group 12.
  • This change of polarization makes the transistor 14 of the first group 12 blocked and passing the transistor 14 of the second group 12.
  • the on state of the transistor of said second group causes the discharge of the capacitor 10 through the primary 13 and the lighting unit or units 11.
  • the voltage pulse due to the discharge of the capacitor 10 is transmitted to the secondary 15 in the primary 13, which again causes the polarization of the gates G of the transistors 14 to change.
  • the system enters into oscillations at a frequency F.
  • the frequency F of the system is relatively low since it is between 100 and 200 khz. This low frequency therefore imposes a value of the capacitor 9 of the time constant 7 relatively high.
  • the use of MOS transistors switching at low voltage has made it possible to reduce the number of turns required in the transformer.
  • the primary of the transformer consists of a single turn on a toroidal core with a diameter of 12 mm and each secondary consists of two turns on the same core. This reduction in the number of turns reduces the electrical losses by heating, the phase shift induced between the voltage and the current in the series circuit, which consequently makes it possible also to reduce the dimensions of the induction coils 19.
  • the external dimensions of the transformer are reduced to a cylinder 12 mm in diameter and 5 mm high.
  • the transformer primary consists of at most five turns and each transformer secondary consists of at most ten turns.
  • each lighting unit 11 comprises a coil 19, a fluorescent tube 20 with electrodes 21, and a capacitor 22 mounted in series between the two electrodes or filaments 21.
  • the coil 19 of the lighting unit 11 allows the creation of a high voltage and keeps the tube 20 in the lit state.
  • the capacitor 22 connecting the filaments 21 of the same tube 20 recovers part of the oscillation and allows the filaments 21 to remain slightly hot. This last effect ensures a wide passage in the tube to the electric current.
  • the high frequency alternating signal present on the primary 13 of the transformer makes it possible to operate a large number of tubes.
  • the load present at the output of the system according to the invention does not affect the operation and the frequency of said system.
  • the tubes 20 are mounted two by two at the outlet of the system.
  • the system according to the invention includes means allowing the rapid discharge of the capacitor 9 of the time constant 7 during the conduction of the transistor 14 of the first group 12, that is to say the source S of which is connected to the output terminal 1B.
  • This means consists of a diode 23 connected on the anode side to the time constant 7 and on the cathode side to the drain D of the transistor 14, the source S of which is connected to the output terminal 1B, ie at common point of the two transistors 14; and a resistor 24 connected between terminal 1A of supply 1 and the anode of diode 23.
  • the diode 23, polarized in the passing direction causes the rapid discharge of the capacitor 9, discharge which is limited only by the weak internal resistance of the transistor 14.
  • the resistor 24 polarizes the said diode in the opposite direction (anode voltage less than cathode voltage). The usefulness of this arrangement is explained by the fact that the switching time of the MOS transistors is less than that of the silicon diodes in general.
  • the winding (s) 19 of the lighting unit (s) 11 receive a tension alternative having a rectangular signal which causes unnecessary heating of these coils 19 and thereby a drop in efficiency.
  • a series connection of capacitor 25 / resistor 26 is connected between the drain D of the transistor 14 of the first group 12 and the terminal 1A of the supply 1.
  • the signal therefore has a more acceptable shape for the winding 19 of the lighting unit or units.
  • this capacitor 25 / resistor 26 assembly makes it possible to increase the system efficiency by approximately 10%, and to eliminate the phenomenon of dark spots on fluorescent tubes 20 due to poor distribution of the ionized charges.
  • the efficiency of the system according to the invention with two 50 W high brightness tubes 20 brings this to 125 lm / W.
  • the table below gives an average value of the electronic components used in the system according to the invention and creating a frequency F of approximately 125 kHz.
  • the system according to the present invention can also supply discharge lamps (mercury vapor) under the same economy conditions as for fluorescent tubes with electrodes.
  • this system requires only a few electronic components, which reduces the risk of system breakdowns in general. This reliability can be further improved by selecting the electronic components themselves and by assembling the circuit on a fully automated machine.
  • this system can advantageously be made in small dimensions: two power MOS transistors, a power supply capacitor, a small transformer (12 mm x 5 mm) and an electronic chip bringing together the rest of the components, all included in a volume less than 40 mx 20 mm x 20 mm.
  • the system according to the invention allows the instantaneous ignition of fluorescent tubes with electrodes, to increase the lifetime of these, to produce an excellent efficiency and to consume very little electric current. It goes without saying that the present invention can receive any arrangement and any variant in the field of technical equivalents without departing from the scope of this patent.

Landscapes

  • Circuit Arrangements For Discharge Lamps (AREA)
  • Discharge-Lamp Control Circuits And Pulse- Feed Circuits (AREA)
EP87810304A 1986-05-23 1987-05-20 Système électronique d'alimentation pour tubes fluorescents à électrodes Withdrawn EP0247002A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR8607508A FR2599208A1 (fr) 1986-05-23 1986-05-23 Systeme electronique d'alimentation pour tubes fluorescents a electrodes
FR8607508 1986-05-23

Publications (1)

Publication Number Publication Date
EP0247002A1 true EP0247002A1 (fr) 1987-11-25

Family

ID=9335637

Family Applications (1)

Application Number Title Priority Date Filing Date
EP87810304A Withdrawn EP0247002A1 (fr) 1986-05-23 1987-05-20 Système électronique d'alimentation pour tubes fluorescents à électrodes

Country Status (15)

Country Link
US (1) US4945289A (xx)
EP (1) EP0247002A1 (xx)
JP (1) JPH01500628A (xx)
KR (1) KR880701517A (xx)
CN (1) CN87103817A (xx)
AU (1) AU7358787A (xx)
DK (1) DK28888A (xx)
FI (1) FI880275A (xx)
FR (1) FR2599208A1 (xx)
IL (1) IL82597A0 (xx)
MA (1) MA20979A1 (xx)
PT (1) PT84927B (xx)
TN (1) TNSN87068A1 (xx)
WO (1) WO1987007469A1 (xx)
YU (1) YU92387A (xx)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2222918A (en) * 1988-09-20 1990-03-21 Tian Pyng Chern Fluorescent tube power supply

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN100383616C (zh) * 2004-12-30 2008-04-23 鸿富锦精密工业（深圳）有限公司 一种液晶显示器电路
CN102325400A (zh) * 2011-06-16 2012-01-18 台达电子企业管理（上海）有限公司 调光系统及其阻尼电路

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2080652A (en) * 1980-07-21 1982-02-03 Philips Nv Oscillator for supplying an electrodeless discharge lamp
EP0126556A1 (en) * 1983-05-05 1984-11-28 Dubank Electronics (Pty) Limited Method of starting and operating a gas discharge lamp, and power supply and electronic ballast therefor
DE3412944A1 (de) * 1984-04-06 1985-10-17 Trilux-Lenze Gmbh + Co Kg, 5760 Arnsberg Elektronisches vorschaltgeraet fuer leuchtstofflampen
EP0171108A1 (en) * 1984-07-26 1986-02-12 Koninklijke Philips Electronics N.V. DC/AC converter for feeding a metal vapour discharge tube

Family Cites Families (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3890537A (en) * 1974-01-02 1975-06-17 Gen Electric Solid state chopper ballast for gaseous discharge lamps
KR810001421B1 (ko) * 1980-03-18 1981-10-20 주식회사 금파전자 연구소 전자식 형광등 안정기
DE3101568C2 (de) * 1981-01-20 1986-01-09 Wollank, Gerhard, Prof. Dipl.-Phys., 5040 Brühl Schaltungsanordnung zum Betrieb von Niederdruckentladungslampen mit einstellbarem Lichtstrom
US4562383A (en) * 1981-07-31 1985-12-31 Siemens Aktiengesellschaft Converter
DE3202445A1 (de) * 1982-01-26 1983-08-04 Deutsche Thomson-Brandt Gmbh, 7730 Villingen-Schwenningen Schaltungsanordnung zur speisung einer leuchtstoffroehre
US4481460A (en) * 1982-02-08 1984-11-06 Siemens Aktiengesellschaft Inverter with charging regulator having a variable keying ratio
DE3235381A1 (de) * 1982-09-24 1984-03-29 Jürgen 5650 Solingen Rensch Leuchte, insbesondere signalleuchte fuer wasserfahrzeuge
US4527098A (en) * 1983-01-28 1985-07-02 General Electric Company Discrete starter for HID lamp
EP0265431A1 (de) * 1985-07-23 1988-05-04 WOLF, Karl Schaltungsanordnung zum starten und zum betrieb mindestens einer niederdruck- oder hochdruck-gasentladungslampe mit hochfrequenten schwingungen

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2080652A (en) * 1980-07-21 1982-02-03 Philips Nv Oscillator for supplying an electrodeless discharge lamp
EP0126556A1 (en) * 1983-05-05 1984-11-28 Dubank Electronics (Pty) Limited Method of starting and operating a gas discharge lamp, and power supply and electronic ballast therefor
DE3412944A1 (de) * 1984-04-06 1985-10-17 Trilux-Lenze Gmbh + Co Kg, 5760 Arnsberg Elektronisches vorschaltgeraet fuer leuchtstofflampen
EP0171108A1 (en) * 1984-07-26 1986-02-12 Koninklijke Philips Electronics N.V. DC/AC converter for feeding a metal vapour discharge tube

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2222918A (en) * 1988-09-20 1990-03-21 Tian Pyng Chern Fluorescent tube power supply
DE3836213A1 (de) * 1988-09-20 1990-04-26 Tian Pyng Chern Vorrichtung zur energieversorgung einer leuchtstoffroehre

Also Published As

Publication number Publication date
WO1987007469A1 (fr) 1987-12-03
KR880701517A (ko) 1988-07-27
IL82597A0 (en) 1987-11-30
CN87103817A (zh) 1987-12-16
PT84927B (fr) 1989-07-20
AU7358787A (en) 1987-12-22
TNSN87068A1 (fr) 1990-01-01
US4945289A (en) 1990-07-31
FR2599208A1 (fr) 1987-11-27
DK28888D0 (da) 1988-01-22
PT84927A (fr) 1987-06-01
JPH01500628A (ja) 1989-03-01
FI880275A0 (fi) 1988-01-22
DK28888A (da) 1988-01-22
FI880275A (fi) 1988-01-22
YU92387A (en) 1989-10-31
MA20979A1 (fr) 1987-12-31

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