EP0340049A1 - Versorgungseinrichtung für eine selbststrahlende Lampe - Google Patents

Versorgungseinrichtung für eine selbststrahlende Lampe Download PDF

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Publication number
EP0340049A1
EP0340049A1 EP89400338A EP89400338A EP0340049A1 EP 0340049 A1 EP0340049 A1 EP 0340049A1 EP 89400338 A EP89400338 A EP 89400338A EP 89400338 A EP89400338 A EP 89400338A EP 0340049 A1 EP0340049 A1 EP 0340049A1
Authority
EP
European Patent Office
Prior art keywords
transformer
winding
primary winding
oscillator
voltage
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Withdrawn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
EP89400338A
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English (en)
French (fr)
Inventor
Roger Schneider
Alain Perchat
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.)
APPLICATIONS ET UTILISATIONS DES PROPRIETES ELECTRIQUES DES MATERIAUX
Original Assignee
APPLICATIONS ET UTILISATIONS DES PROPRIETES ELECTRIQUES DES MATERIAUX
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 APPLICATIONS ET UTILISATIONS DES PROPRIETES ELECTRIQUES DES MATERIAUX filed Critical APPLICATIONS ET UTILISATIONS DES PROPRIETES ELECTRIQUES DES MATERIAUX
Publication of EP0340049A1 publication Critical patent/EP0340049A1/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Withdrawn legal-status Critical Current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
    • H05B41/282—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
    • H05B41/2827—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 using specially adapted components in the load circuit, e.g. feed-back transformers, piezoelectric transformers; using specially adapted load circuit configurations
    • 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
    • H05B41/2855—Arrangements for protecting lamps or circuits against abnormal operating conditions for protecting the circuit against abnormal operating conditions against abnormal lamp operating 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
    • 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
    • H05B41/36—Controlling
    • H05B41/38—Controlling the intensity of light
    • H05B41/39—Controlling the intensity of light continuously
    • H05B41/392—Controlling the intensity of light continuously using semiconductor devices, e.g. thyristor
    • 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
    • H05B41/36—Controlling
    • H05B41/38—Controlling the intensity of light
    • H05B41/39—Controlling the intensity of light continuously
    • H05B41/392—Controlling the intensity of light continuously using semiconductor devices, e.g. thyristor
    • H05B41/3921—Controlling the intensity of light continuously using semiconductor devices, e.g. thyristor with possibility of light intensity variations
    • H05B41/3925—Controlling the intensity of light continuously using semiconductor devices, e.g. thyristor with possibility of light intensity variations by frequency variation

Definitions

  • the invention relates to a luminescent tube supply device provided with a semiconductor switching oscillator; it relates more particularly to a set of improvements making it possible to improve the reliability of this type of device, while making it possible to use only one model of apparatus, for luminescent tubes of different lengths.
  • the invention proposes a new type of electronic device for feeding a luminescent tube, having increased reliability, a saving in weight and size and better current regulation.
  • the proposed device is also remarkable in that it automatically adapts to any type of luminescent tube, especially of any length.
  • the invention therefore relates to a luminescent tube supply device, characterized in that it comprises: - a variable frequency switching oscillator comprising a first transformer provided with a primary winding and a saturation winding, a second transformer comprising a primary winding, one end of which is connected to said primary winding of said first transformer, a secondary winding intended to be connected to said luminescent tube and a reference winding, and - regulating means arranged between said reference winding and said saturation winding to regulate the current passing through said luminescent tube by varying the operating frequency of said oscillator.
  • a variable frequency switching oscillator comprising a first transformer provided with a primary winding and a saturation winding
  • a second transformer comprising a primary winding, one end of which is connected to said primary winding of said first transformer, a secondary winding intended to be connected to said luminescent tube and a reference winding
  • - regulating means arranged between said reference winding and said saturation winding to regulate the current passing through said luminescent tube by
  • the windings of said second transformer are highly coupled (as opposed to the leakage transformer generally used) and the primary winding of this transformer is connected to the primary winding of said first transformer by means of a self-induction separate.
  • This arrangement allows effective protection of the transformer, particularly in the case of no-load operation, thanks to the addition of a simple diode protection circuit.
  • Another object of the invention is to prevent the occurrence of such a phenomenon.
  • the invention also relates to a device of the kind defined above and further comprising a means for establishing different amplitude values between two consecutive half-waves of said switching oscillator.
  • this means can consist of a Zener diode interposed between said saturation winding and said regulation means. Indeed, it has been found that the fact of creating an imbalance between the half-waves of the switching oscillator had the result of making said resonance phenomenon "in balls" disappear.
  • the supply device as shown diagrammatically in FIG. 1 mainly consists of a switching oscillator 11 with variable frequency, a first transformer 12 forming part of this oscillator, a second transformer 13 capable of supplying a luminescent tube 14 , a self-induction 15 and regulation means 16 arranged between the transformers 12 and 13.
  • Electric power is supplied here by the alternative layout network connected to the V AC terminals.
  • This voltage for example of 220 Volts is rectified by a conventional bridge rectifier 18, developing between the conductors 19 and 20 a rectified voltage whose waveform is substantially that of a succession of half-sinusoids.
  • the capacitors C1 and C2 connected in series between the conductors 19 and 20 have, here, a relatively low capacity, so that the rectified voltage does not undergo proper "filtering".
  • supply voltage source V R
  • any direct voltage possibly rectified and not filtered (that is to say of the shape of one indicated above) capable of supplying the oscillator 11. This voltage is therefore applied between the conductors 19 and 20.
  • the device could also operate from a stable continuous voltage, i.e. a filtered rectified voltage or a voltage supplied by an accumulator battery.
  • the switching oscillator 11 comprises, in addition to the transformer 12, two oscillating half-bridges.
  • the first half-bridge is made up of semiconductor components, here transistors Q1, Q2 and more particularly field effect transistors, of the MOS type.
  • the second half-bridge is formed by the two capacitors C1, C2 mentioned above.
  • the transistors Q1 and Q2 are mounted with their drain-source circuits in series, between the conductors 19 and 20.
  • Each of the control inputs of the transistors Q1, Q2 (here their "gates") are connected to secondary windings 12 b , 12 c , respective of the transformer 12.
  • the primary winding 12 a of this same transformer is connected by one of its ends to the midpoint of the half-bridge of transistors, that is to say ie between the two transistors Q1, Q2.
  • the primary winding 13 a of the second transformer 13 is connected between the two half-bridges via the series connection of the primary winding 12 a (which has only a few turns) and of the self-induction 15. More precisely, a first end of primary winding 13 a is connected to primary winding 12 a via self-induction 15 while a second end of primary winding 13 a is connected to the midpoint of the half bridge of capacitors C1, C2.
  • a starting network of the oscillator 11 comprises a resistor R1, a diode D1, a diac 25 and a capacitor C3.
  • the resistor R1 connected to the conductor 19 forms a series branch with the capacitor C3 connected to the conductor 20.
  • the diode D1 is connected between the midpoint of this branch and the midpoint of the half-bridge of transistors.
  • the diac 25 is connected between the "gate" of the transistor Q2 and the midpoint of said series branch R1, C3.
  • the resistor R1 charges the capacitor C3 until the voltage across the latter is equal to the starting voltage of the diac 25, which transmits the energy, accumulated in the capacitor C3, to the "grid "of the transistor Q2, which triggers the first conduction of the transistor and the self-oscillation of the switching oscillator 11.
  • the diode D1 short-circuits the capacitor C3 at each conduction of the transistor Q2, to avoid untimely starting of the diac 25.
  • the second transformer 13 is not a "leaky” transformer.
  • the coupling between its windings, in particular the primary winding 13 a and the secondary winding 13 b is high.
  • the luminescent tube 14 is designed to be directly connected to the terminals of this secondary winding 13b .
  • the combination of the transformer 13 and the self-induction 15 advantageously replaces a "leaky” transformer, as will be seen below. Therefore, the switching oscillator 11 can be completed by a diode half-bridge D2, D3 in series, connected in reverse to the rectified voltage source, that is to say between the conductors 19 and 20.
  • the midpoint of this half-diode bridge is connected to the link established between the self-induction 15 and said first end of the primary winding 13 a of the second transformer 13. The role of this half-diode bridge will be explained more far.
  • said first transformer 12 comprises a saturation winding 12 d
  • said second transformer 13 comprises a reference winding 13 c
  • the regulating means 16 are arranged between said reference winding 13 c and said winding saturation 12 d , so as to regulate the current passing through the luminescent tube 14, by varying the operating frequency of the switching oscillator 11.
  • these means of regulation comprise first rectifying means constituted here by a simple diode D4 connected to the reference winding 13 c and ensuring a full-wave rectification, as well as second rectifying means 26, constituted here by a bridge of four diodes ensuring rectification double alternation.
  • This diode bridge is connected to the terminals of the saturation winding 12 d and a charging circuit 30 is established between the terminals of rectified voltage of said rectifying means 26.
  • This charging circuit 30 comprises in particular a semiconductor component such that 'a transistor Q3 developing between its terminals a voltage representative of the DC voltage produced by said first rectifying means.
  • this semiconductor component is a field effect transistor and the drain-source link of this transistor is part of said load circuit.
  • Said first rectification means that is to say the diode D4, is connected to charge a capacitor C4 at the terminals of which a potentiometer P1 is connected, the cursor of which is connected to the control electrode (here the "grid") of transistor Q3. Consequently, part of the voltage developed across the capacitor C4 is taken by the potentiometer P1 to drive the transistor Q3.
  • the drain-source link of the latter is connected in series with a Zener diode Z1 which is also part of said load circuit 30. Consequently, at each half-wave of oscillator 11, the voltage "seen” by the saturation winding 12 d depends on the voltage developed across the charge circuit defined above.
  • Zener diode Z2 is connected in parallel on the drain-source link of the transistor Q3 as well as a low value capacitor C5, whose role is to eliminate the parasites.
  • the role of the Zener diode Z1 is to limit the frequency of the oscillator 11 when the device is operating at no load, that is to say when the transistor Q3 is saturated.
  • the Zener diode Z2 determines an upper limit of saturation voltage for the winding 12 d in the case where the transistor Q3 is blocked, which can, for example, be caused by an operation in short-circuit.
  • the device described comprises means for establishing values of different amplitudes between two consecutive half-waves of said switching oscillator 11, that is to say to create a difference between the half-waves corresponding respectively to the conductions of the transistors Q1 and Q2.
  • it is a simple Zener diode Z3 interposed between the saturation winding 12 d and the second rectification means 26. In this way, the voltage "seen" by the saturation winding 12 d is different from one alternation to another depending on the direction of current flow in the Zener diode Z3.
  • the operation of the device which has just been described is as follows: As soon as the device is connected to the AC distribution network V AC , the chopping oscillator 11 enters into self-oscillation, the transistors Q1 and Q2 being periodically switched under the control of the windings 12 b and 12 c . Taking into account the assembly, the current passing through the primary winding 12 a , also passes through the primary winding 13 a and the self-induction 15. In accordance with the principle of the invention, the frequency of the oscillator 11 will stabilize around d a value for which the luminescent tube 14 will be traversed by a suitably chosen current, with regulation of the latter.
  • the luminescent tube 14 behaves practically like a Zener diode "imposing" the voltage across its terminals, that is to say across the terminals of the secondary winding 13b .
  • This voltage depends on the specific characteristics of the luminescent tube 14 and in particular its length. It is therefore important to regulate the current passing through the tube 14 so that the latter operates under optimal conditions. In fact, if the current is too weak, the lighting is poor and if it is too strong, the life of the tube is shortened.
  • the regulation means 16 regulate the current sought. Indeed, the self-induction 15 limits the variation of current in the primary winding 13 a of the transformer 13. Now, the voltage across the terminals of the primary winding 13 a imposed by the tube 14 and all of the voltage d available power is shared between the primary winding 13 a and the self-induction 15. Consequently, if the voltage tends to increase at the terminals of the primary winding 13 a , then the voltage at the terminals of the self-induction 15 tends to decrease. The growth of the current at each half-wave therefore also tends to decrease. If one wants to maintain the peak current in the tube 14 at a constant value, it is therefore necessary to drive longer at each half-wave, that is to say that the frequency of the oscillator 11 must decrease.
  • the diodes D2 and D3 make it possible to avoid overvoltages during a no-load operation (that is to say for example when the tube 14 is broken) by returning the energy accumulated in the transformer 13 to one of the capacitors C1 or C2.
  • the energy accumulated when it blocks has tendency to generate an overvoltage between the primary winding 13 a and the self-inductance 15.
  • this overvoltage is eliminated by the fact that the energy is returned to the capacitor C1 by the diode D2. Under these conditions, the voltage excursion across the terminals of the primary winding is limited to that of the AC distribution network and the transformer 13 is of course calculated to withstand such a voltage.
  • this series connection of the primary winding 13 a of a high coupling transformer 13 with a self-inductance 15 is the equivalent of a "leaky” transformer, the self-inductance 15 materializing in a way the "escape self".
  • a transformer "without leakage” and a separate inductance it is possible to connect the half-bridge of diodes D2, D3, that is to say the elimination of overvoltages in no-load operation.
  • the fact of separating the transformer 13 from the “leakage choke” 15 makes it possible to properly control the transformation ratio of the transformer 13.
  • a secondary 13 b known as “with taps” comprising selected numbers of turns between a common terminal a and terminals b , c , d , for supplying different luminescent tubes requiring different currents.
  • the luminescent tubes are classified into three main families according to the admissible current (25mA, 50mA, 100mA) it is possible, from a single transformer 13 and therefore from a single model of device power supply, to cover the whole range of luminescent tubes.
  • FIG. 2 illustrates a variant in which the transistor Q3 is replaced by an adjustable Zener diode Z4.
  • the control input of this diode is connected to the cursor of the potentiometer P1 while a resistor R1 establishes a feedback between the common point of the diodes Z1 and Z2 and the said control input of the diode Z4.
  • the latter is equivalent to an operational amplifier with integrated reference.

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Circuit Arrangements For Discharge Lamps (AREA)
EP89400338A 1988-02-16 1989-02-07 Versorgungseinrichtung für eine selbststrahlende Lampe Withdrawn EP0340049A1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR8801798A FR2627342B1 (fr) 1988-02-16 1988-02-16 Dispositif d'alimentation de tube luminescent
FR8801798 1988-02-16

Publications (1)

Publication Number Publication Date
EP0340049A1 true EP0340049A1 (de) 1989-11-02

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Family Applications (1)

Application Number Title Priority Date Filing Date
EP89400338A Withdrawn EP0340049A1 (de) 1988-02-16 1989-02-07 Versorgungseinrichtung für eine selbststrahlende Lampe

Country Status (2)

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EP (1) EP0340049A1 (de)
FR (1) FR2627342B1 (de)

Cited By (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0417315A1 (de) * 1989-03-27 1991-03-20 Toshiba Lighting & Technology Corporation Anzündanordnung für eine entladungslampe
WO1991007863A1 (en) * 1989-11-18 1991-05-30 Ac/Dc Lighting Limited Inverters and cathode lamp arrangements
EP0479352A1 (de) * 1990-09-14 1992-04-08 Koninklijke Philips Electronics N.V. Dimbares Vorschaltgerät für Entladungslampen
EP0577975A1 (de) * 1992-07-06 1994-01-12 LESTICIAN BALLAST Inc. Dimmbares Vorschaltgerät mit Strommessung
EP0580255A1 (de) * 1992-07-20 1994-01-26 Koninklijke Philips Electronics N.V. Geschützter Umrichter zur Steuerung einer Entladungslampe
EP0948245A2 (de) * 1998-03-31 1999-10-06 General Electric Company Dimmbares elektronisches Vorschaltgerät mit komplementären elektronischen Schaltern
WO2000024233A2 (en) * 1998-10-16 2000-04-27 Electro-Mag International, Inc. Ballast circuit
US6169375B1 (en) 1998-10-16 2001-01-02 Electro-Mag International, Inc. Lamp adaptable ballast circuit
EP1073317A2 (de) * 1999-07-26 2001-01-31 Lestec. Co., Ltd. Vorschaltgerät für eine Entladungslampe
WO2009108441A1 (en) * 2008-02-29 2009-09-03 General Electric Company Dimmable instant start ballast
US7990070B2 (en) 2009-06-05 2011-08-02 Louis Robert Nerone LED power source and DC-DC converter
US8212498B2 (en) 2009-02-23 2012-07-03 General Electric Company Fluorescent dimming ballast
CN103098358A (zh) * 2010-03-26 2013-05-08 拉塞尔·雅克 使用双极结型晶体管的自激振荡变流器的调节控制器
EP1707256B1 (de) 2003-03-21 2016-10-19 Kemira Oyj Vorrichtung und Verfahren zur kontinuierlichen Herstellung von Emulsionen oder Dispersionen

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0389493A (ja) * 1989-08-31 1991-04-15 Toshiba Lighting & Technol Corp 放電灯点灯装置
DE4436465A1 (de) * 1994-10-12 1996-04-18 Patent Treuhand Ges Fuer Elektrische Gluehlampen Mbh Schaltungsanordnung zum Betreiben von Glühlampen
US5761056A (en) * 1997-02-20 1998-06-02 Boam R & D Co., Ltd. Circuit for protecting fluorescent lamp from overload
US6072710A (en) * 1998-12-28 2000-06-06 Philips Electronics North America Corporation Regulated self-oscillating resonant converter with current feedback
US6111363A (en) * 1999-07-21 2000-08-29 General Electric Company Ballast shutdown circuit for a gas discharge lamp
US7733028B2 (en) 2007-11-05 2010-06-08 General Electric Company Method and system for eliminating DC bias on electrolytic capacitors and shutdown detecting circuit for current fed ballast

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0075176A2 (de) * 1981-09-18 1983-03-30 Oy Helvar Elektronischer Ballast für Entladungslampen
GB2119184A (en) * 1982-04-21 1983-11-09 Helvar Oy High frequency current supply method and apparatus
EP0178852A1 (de) * 1984-10-16 1986-04-23 ADVANCE TRANSFORMER CO. (a Division of Philips Electronics North America Corporation) Elektronisches Vorschaltgerät für Leuchtstofflampen
US4727470A (en) * 1986-10-10 1988-02-23 Nilssen Ole K Resonant inverter having crest factor control

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0075176A2 (de) * 1981-09-18 1983-03-30 Oy Helvar Elektronischer Ballast für Entladungslampen
GB2119184A (en) * 1982-04-21 1983-11-09 Helvar Oy High frequency current supply method and apparatus
EP0178852A1 (de) * 1984-10-16 1986-04-23 ADVANCE TRANSFORMER CO. (a Division of Philips Electronics North America Corporation) Elektronisches Vorschaltgerät für Leuchtstofflampen
US4727470A (en) * 1986-10-10 1988-02-23 Nilssen Ole K Resonant inverter having crest factor control
US4727470B1 (de) * 1986-10-10 1992-06-30 K Nilssen Ole

Cited By (24)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0417315A4 (en) * 1989-03-27 1993-03-10 Toshiba Lighting & Technology Corporation Device for lighting a discharge lamp
EP0417315A1 (de) * 1989-03-27 1991-03-20 Toshiba Lighting & Technology Corporation Anzündanordnung für eine entladungslampe
WO1991007863A1 (en) * 1989-11-18 1991-05-30 Ac/Dc Lighting Limited Inverters and cathode lamp arrangements
EP0479352A1 (de) * 1990-09-14 1992-04-08 Koninklijke Philips Electronics N.V. Dimbares Vorschaltgerät für Entladungslampen
US5172033A (en) * 1990-09-14 1992-12-15 U. S. Philips Corporation Discharge lamp operating inverter circuit with electric dimmer utilizing frequency control of the inverter
USRE35994E (en) * 1992-07-06 1998-12-15 Icecap, Inc. Variable control, current sensing ballast
EP0577975A1 (de) * 1992-07-06 1994-01-12 LESTICIAN BALLAST Inc. Dimmbares Vorschaltgerät mit Strommessung
EP0580255A1 (de) * 1992-07-20 1994-01-26 Koninklijke Philips Electronics N.V. Geschützter Umrichter zur Steuerung einer Entladungslampe
EP0948245A2 (de) * 1998-03-31 1999-10-06 General Electric Company Dimmbares elektronisches Vorschaltgerät mit komplementären elektronischen Schaltern
EP0948245A3 (de) * 1998-03-31 2001-05-02 General Electric Company Dimmbares elektronisches Vorschaltgerät mit komplementären elektronischen Schaltern
WO2000024233A2 (en) * 1998-10-16 2000-04-27 Electro-Mag International, Inc. Ballast circuit
WO2000024233A3 (en) * 1998-10-16 2000-09-21 Electro Mag Int Inc Ballast circuit
US6169375B1 (en) 1998-10-16 2001-01-02 Electro-Mag International, Inc. Lamp adaptable ballast circuit
EP1073317A2 (de) * 1999-07-26 2001-01-31 Lestec. Co., Ltd. Vorschaltgerät für eine Entladungslampe
EP1073317A3 (de) * 1999-07-26 2002-07-31 Lestec. Co., Ltd. Vorschaltgerät für eine Entladungslampe
EP1707256B1 (de) 2003-03-21 2016-10-19 Kemira Oyj Vorrichtung und Verfahren zur kontinuierlichen Herstellung von Emulsionen oder Dispersionen
WO2009108441A1 (en) * 2008-02-29 2009-09-03 General Electric Company Dimmable instant start ballast
US7816872B2 (en) 2008-02-29 2010-10-19 General Electric Company Dimmable instant start ballast
CN101960924A (zh) * 2008-02-29 2011-01-26 通用电气公司 可调光瞬时启动镇流器
CN101960924B (zh) * 2008-02-29 2014-07-02 通用电气公司 可调光瞬时启动镇流器
US8212498B2 (en) 2009-02-23 2012-07-03 General Electric Company Fluorescent dimming ballast
US7990070B2 (en) 2009-06-05 2011-08-02 Louis Robert Nerone LED power source and DC-DC converter
CN103098358A (zh) * 2010-03-26 2013-05-08 拉塞尔·雅克 使用双极结型晶体管的自激振荡变流器的调节控制器
CN103098358B (zh) * 2010-03-26 2016-03-30 拉塞尔·雅克 使用双极结型晶体管的自激振荡变流器的调节控制器

Also Published As

Publication number Publication date
FR2627342B1 (fr) 1990-07-20
FR2627342A1 (fr) 1989-08-18

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