EP0271396B1 - Verfahren und Vorrichtung zur Zündung von Entladungslampen - Google Patents

Verfahren und Vorrichtung zur Zündung von Entladungslampen Download PDF

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Publication number
EP0271396B1
EP0271396B1 EP19870402640 EP87402640A EP0271396B1 EP 0271396 B1 EP0271396 B1 EP 0271396B1 EP 19870402640 EP19870402640 EP 19870402640 EP 87402640 A EP87402640 A EP 87402640A EP 0271396 B1 EP0271396 B1 EP 0271396B1
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EP
European Patent Office
Prior art keywords
frequency
lamp
pulses
passage
value
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Expired - Lifetime
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EP19870402640
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English (en)
French (fr)
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EP0271396A1 (de
Inventor
Pierre Perche
Marcel Perche
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PERCHE Ets
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PERCHE Ets
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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
    • 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
    • H05B41/288—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 without preheating electrodes, e.g. for high-intensity discharge lamps, high-pressure mercury or sodium lamps or low-pressure sodium lamps
    • H05B41/2881—Load circuits; Control thereof
    • H05B41/2882—Load circuits; Control thereof the control resulting from an action on the static converter
    • H05B41/2883—Load circuits; Control thereof the control resulting from an action on the static converter the controlled element being a DC/AC converter in the final stage, e.g. by harmonic mode starting

Definitions

  • the present invention relates to an electronic ignition method and device, in particular intended for supplying discharge lamps, with cold or hot cathode, from alternating current from the mains.
  • the present invention relates to a method and a device which, while retaining the principle of lighting the arc lamp, by virtue of the overvoltage created in a resonant circuit, by means of a switching power supply providing pulses of high frequency , allows the use of an inductor winding, the value of which can be relatively imprecise and avoids the drawbacks of conventional solutions, such as those proposed for example in FR-A 2 343 287 and US-A 4 388 563 while also providing a high operational safety, in particular without risk of overcurrent in the lamp circuit when it is switched on.
  • the invention also aims to ensure, in the event of a cut in the supply of the lamp, a safe re-ignition thereof.
  • the process considered, for the ignition of a discharge lamp mounted in a circuit series resonant comprising an inductor and a capacitor, the lamp being arranged in series with the inductor and in parallel on the capacitor, this resonant circuit being arranged in the diagonal of a bridge at the terminals of which are supplied voltage pulses supplied by a power supply at switching is characterized in that it consists in varying the switching frequency of the supply pulses in a frequency range extending between two predetermined extreme values which surround the resonant frequency of the circuit or one of its harmonics according to a approximately linear law, respectively increasing then decreasing, with a given scanning period of this range, to adjust the angle of passage of the pulses measuring the ratio of the duration of these to their period to a constant and limited value so that that the current supplied to the lamp at each pulse is significantly reduced, then when the lamp is turned on thanks to the overvoltage created by the resonance of the circuit when the switching frequency is equal to the resonance frequency, to detect the passage of the current in the lamp to reduce the frequency of the
  • the method according to the invention thus makes it possible, during each ignition sequence of the lamp, to ensure that the switching frequency or one of its harmonics varies regularly between a minimum frequency lower than the resonance frequency, and a maximum frequency greater than this resonant frequency, the angle of passage of the pulses, characterizing the amount of electrical energy passing through the electronic switches supplying the lamp according to the alternations of the supply current, being reduced to a value such that at ignition the overcurrent produced is always acceptable by the installation.
  • the invention also relates to a device for implementing the method, comprising a switching power supply consisting of a filtered and rectified voltage source, joined to the terminals of a bridge comprising in each of its branches electronic switches in pairs associated and in the diagonal of the bridge, a resonant circuit comprising a winding of inductor and a capacitor, the lamp being mounted in this diagonal in series with the inductor and in parallel on the capacitor, the switches being operated simultaneously so that each close when the others open, characterized in that the switching power supply includes a pulse generator arranged so that the pulses at the terminals of the bridge have a variable frequency which increases and decreases respectively, by scanning a range of frequencies ranging between a lower value and a higher value at the reso frequency nance of the circuit or one of its harmonics and whose passage angle is small, so that at resonance the current flowing through the lamp and the switches is limited to an admissible value, and in that it comprises series with the lamp, a device for detecting the flow of current through this lamp when it is
  • the electronic switches consist of MOS transistors receiving on their grid voltage pulses coming from the generator and causing the alternating conduction or blocking of these transistors.
  • the voltage pulses are supplied through the windings of an isolation transformer.
  • the pulse generator comprises a circuit supplying a sawtooth signal whose amplitude and period vary between two predetermined cutoff values, means for producing from this signal a variation in the switching frequency respectively increasing then decreasing and means for simultaneously adjusting the period and the duration of the voltage pulses supplied according to the variation in the switching frequency at a passage angle having a constant value across the whole range.
  • the detector of the ignition current in the lamp is constituted by a complementary inductor winding, arranged on a conductor joined to one of the electrodes of the lamp and in which the passage of the current after the ignition creates a voltage signal such that the variation in current thus detected acts on the pulse generator and reduces the switching frequency to its lower value in the range, where it is less than the resonance frequency, the angle of passage pulses being reduced simultaneously to a higher value.
  • references 1 and 2 designate the terminals of an alternating voltage source connected to an ignition circuit comprising a capacity 3 and a winding of inductor 4, respectively joined to electrodes 5 and 6 a discharge lamp 7 with a cold cathode.
  • the circuit includes an overvoltage generator 8, making it possible to create between these electrodes a very high ignition voltage such that an electric arc is established in the lamp.
  • the overvoltage generator 8 In operation, if the voltage between the electrodes 5 and 6 is of the order of 100 volts, the overvoltage generator 8 must be capable of creating a ignition voltage of the order of a thousand volts at least.
  • the lamp 7 is a hot cathode lamp where the electrodes 9 and 10 are, prior to ignition, traversed by a current raising their temperature, following the closing of a switch 11 called commonly "choke" mounted in parallel and placing these electrodes in short circuit.
  • the ignition voltage is still around 400 volts.
  • the winding of the inductor 4 must make it possible, when the electrodes of the lamp are short-circuited, to supply the latter with a suitable overvoltage capable of creating the arc between the electrodes.
  • this inductor due to the frequency of the supply current, usually alternating current at 50 periods, this inductor must have large dimensions, which in all cases results in a bulk and a high weight, ill-suited in particular for use. for discharge lamps or neon tubes for domestic or even industrial use.
  • FIGS 3 and 4 illustrate ignition systems also known in the art but with electronic operation.
  • the AC voltage source at 50 periods from the sector is connected to terminals 1 and 2 of the circuit, this voltage then being filtered at 12 and then rectified at 13 so as to supply terminals 15 and 16 of a capacitor 14 at the input d 'an appropriate rectified DC voltage cutting circuit.
  • a resonant circuit comprising a winding of inductor 19 and a capacitor 20.
  • the discharge lamp 23 is arranged at the terminals 21 and 22 of the latter.
  • the ignition voltage to be created at these terminals 21 and 22 is obtained by resonance of a series circuit constituted by a winding of inductor 19 and a capacitor 20 so as to cause during this resonance a suitable overvoltage.
  • T3 and T4 on the other hand are operated by an external circuit (not shown) so that some close when the others open.
  • drawbacks remain, in particular from the fact that the switching frequency must be exactly adjusted to the resonant frequency when the latter may drift during operation, thus making the lighting of the lamp uncertain, especially after accidental or voluntary shutdown of this one.
  • FIG. 4 finally illustrates another alternative embodiment also known in which only two transistors T 'and T ", mounted in two branches of the point, the two other branches comprising two capacitors, are used for each alternation of the supply current. decoupling 14a and 14b In this case, however, the operation is similar and leads to the same drawbacks.
  • Figure 5 illustrates the adaptations made according to the invention to the mounting of a switching power supply of the kind illustrated in Figure 3.
  • the supply terminals 1 and 2 the filter 12 and the rectifier 13 of the mains supply voltage, the capacitor 14 and the terminals 15 and 16 on the one hand, 17 and 18 of the bridge, the latter comprising in its branches the four transistors T1 to T4 and in its diagonal the winding of inductor 19, capacity 20 and finally at terminals 21 and 22 of the latter, the arc lamp 23.
  • the closing or opening of the switches T1 to T4 is produced from pulses delivered on their gates and coming from a pulse generator circuit. 24, the details of an exemplary embodiment of which will be given below.
  • This generator in fact delivers on an output 25 pulses which are either directly routed to the gates of the transistors T1 and T3 by connections 26 and 27, either through a galvanic isolation transformer 28 and the secondary windings 29 and 30 thereof to the gates of the transistors T2 and T4, according to the alternations of the supply current in order to store the energy in the self 19 necessary for the creation of the lighting overvoltage of the lamp 23.
  • FIG. 6 now illustrates in more detail the construction of this pulse generator 24.
  • This circuit 33 is associated with a resistor 34 and a capacitor 35, adjusted so that, without further action and in particular when the lamp is on, it supplies at its output voltage pulses having a base or reference frequency, by example equal to 70 kHz and in any event less than the resonance frequency of the circuit constituted by the inductor 19 and the capacitor 20 at the terminals of the lamp 23.
  • the current passing through a spindle 50 of the circuit 33 is varied in a sawtooth fashion from a variable so-called sweep voltage, supplied at 36 on the base of a transistor 37, the emitter of which is connected to a resistor bridge, respectively 38 and 39, the resistor 39 having for example a double value of the resistor 38.
  • the voltage at rest on the emitter of transistor 37 is equal to 1/3 of the supply voltage.
  • the output current supplied to pin 50 by connection 40 which in a way constitutes the image of the scanning voltage at 36 minus the reference voltage on the emitter of transistor 37, will vary between two values which correspond to a zero value and a maximum value successively according to respectively increasing and decreasing laws, and with a predetermined scanning period, dependent on that of the corresponding voltage signal.
  • the diagram of FIG. 7 illustrates, for a given scanning period, fixed by a circuit 48 and the role of which will be specified below, chosen for example here of the order of one second, the shape of the signal representative of the voltage of scan in 36, thus gradually increasing then decreasing.
  • the circuit 33 then realizes from this voltage sweep, a concomitant variation of the frequency of the output pulses delivered on the output 25, within a determined range and which surrounds the resonance frequency of the circuit of the choke 19 or one of its harmonics and of the capacitor 20.
  • the frequency thus varies between 70 kHz and 160 kHz, so as to necessarily intersect the resonance frequency, chosen by construction equal to approximately 100 kHz for example.
  • the pulse generator 24 is designed in such a way that simultaneously with the frequency sweeping of the pulses supplied, they have a crossing angle, that is to say a ratio of their duration to their period which remains substantially constant during the scanning of the range, therefore whatever the frequency of these pulses.
  • the circuit 33 has an input 41 for an adjustment voltage delivered from a bridge of two resistance 42 and 43, at the terminals of which a third resistance 44 is connected, the variable current passing through this resistance 44, coming from a transistor 45 making it possible to vary in proportion to the frequency of the pulses therefore to their period , the duration of these.
  • the passage angle is maximum; if, on the other hand, the transistor 45 is conductive and flows through the resistor 44, the passage angle is minimal, in correspondence with the equally maximum and minimum values of the switching frequency in the range considered, as shown in Figure 7 in the diagram thereof giving the shape of the pulses at the output of circuit 33, on connection 25.
  • the pulse generator 24 also comprises a circuit 46, connected to the complementary winding 31 detecting the passage of current at the output of the lamp 23, if once the latter is turned on, this circuit 46 making it possible to immediately bring to zero the output voltage of this circuit at point 47, thereby blocking transistor 45 and consequently restoring the angle of passage of the pulses supplied by circuit 33 to a maximum and optimal value, defined by the ratio of resistors 42 and 43, the resistor 44 no longer intervening.
  • the voltage thus brought to zero at 47 then acts on a complementary circuit 48, itself supplying a signal making it possible to inhibit the transistor 37 so that the voltage at 36 and consequently the chopping frequency of the final signal for controlling the transistors T1 to T4 is necessarily reduced to a value lower than the resonance frequency.
  • the circuit 48 is a RESET 555 type circuit, manufactured in particular by the same companies as mentioned above.
  • the pulses from the generator 24, delivered by the circuit 33 on the connection 25 are routed after suitable amplification if necessary in 49 to the winding 28 of the transformer and either directly to the connections 26 and 27 joined to the gates of the transistors T1 and T3, or through the windings 29 and 30 to the gates of the other two transistors T2 and T4, thereby ensuring control of the alternating conduction and blocking sequences of these transistors, symmetrically and by identical pulses, in accordance with arrangements made or opened in a known manner in conventional devices of the series inverter type.
  • FIG. 7 then makes it possible to explain the particular operation of the pulse generator according to the invention, during the lighting phase of the lamp where the scanning voltage is gradually caused to increase and then decrease with a predetermined period to ensure a Adequate frequency sweep of the resonant of the resonant circuit.
  • the pulses at the output of the generator 25 indeed have a variable frequency, chosen so that it scans permanently, with the periodicity thus predetermined, a range of 70 to 160 kHz for example, and that it therefore necessarily overlaps the resonant frequency of the self circuit 19- capacitor 20 or one of its harmonics, in series with the lamp 23.
  • the angle of passage of the pulses is kept constant by the resistors 42, 43 and 44 and limited to a reduced value , especially around 5%.
  • the diagram of FIG. 7 illustrates the profile of the pulses thus delivered on the connection 25 at the output of the generator 24, the duration of the pulses being all the more reduced that their frequency is greater and vice versa, the quantity of corresponding energy remaining in total identical to itself.
  • the self resistance circuit 19 - capacitor 20 enters into resonance and produces, at the terminals of the lamp 23, the necessary ignition overvoltage.
  • the lamp lights up, it immediately delivers a current, detected and returned to the pulse generator 31 to the pulse generator 24.
  • This due to the zeroing of the voltage at point 47, stops the frequency scanning and reduces the effective frequency of the chopping pulses to a value lower than the resonant frequency.
  • the angle of passage of the pulses is then simultaneously increased to an optimal value, for example of the order of 45%.
  • the transistor 37 is blocked while the switching frequency is brought back to its reference value, determined by the resistor 34 and the capacitor 35.

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Circuit Arrangements For Discharge Lamps (AREA)

Claims (7)

  1. Verfahren zur Zündung einer Entladungslampe, insbesondere nach Art einer Bogenlampe oder einer Neonröhre, die in einem Resonanzkreis angeordnet ist, der in Reihe eine Drosselspule (19) und eine Kapazität (20) aufweist, wobei die Lampe (23) in Reihe mit der Drosselspule und parallel zu der Kapazität und der Resonanzkreis in der Diagonalen einer Brücke zwischen Klemmen angeordnet ist, denen Impulse von einer Unterbrechungseinspeisung zugeführt werden, wobei das Verfahren die die Detektion des Stromflusses durch die Lampe und die Einstellung der Impulse auf einen unter der Resonanzfrequenz liegenden Wert vorsieht, dadurch gekennzeichnet, daß das Verfahren folgende Verfahrensschritte aufweist:
    - eine Variation der Frequenz der Unterbrechung der Impulse der Einspeisung in einem Frequenzband zwischen zwei vorher festgelegten Extremwerten um die Resonanzfrequenz des Stromkreises oder einer seiner Harmonischen herum nach einer etwa linearen Gesetzmäßigkeit ansteigend und dann abfallend mit einer gegebenen Durchlaufperiode dieses Bandes;
    - ein gleichzeitiges Einstellen des Winkels des Übergangs der Impulse, der dem Verhältnis ihrer Dauer zu ihrer Periode entspricht, auf einen konstanten und derart begrenzten Wert, daß der an die Lampe gelieferte Strom bei jedem Impuls erheblich reduziert ist;
    - dann, bei der Zündung der Lampe mit Überspannung, die von dem Resonanzkreis gebildet wird, wenn die Kippfrequenz der Resonanzfrequenz oder einer seiner Harmonischen entspricht, eine Steigerung des Winkels des Übergangs der Impulse auf einen optimalen Wert unter gleichzeitigem Rückführen der Frequenz auf einen beträchtlich unter der Resonanzfrequenz liegenden Wert.
  2. Vorrichtung zur Durchführung des Verfahrens nach Anspruch 1, mit einer Unterbrechungseinspeisung aus einer gefilterten und gleichgerichteten Spannungsquelle (1-2), die mit Klemmen (15-16) einer Brücke verbunden ist, die in jedem ihrer Zweige paarweise verbundene elektronische Unterbrecher (T1 bis T4) und in der Diagonalen der Brücke einen Resonanzkreis mit einer Drosselspule (19) und einer Kapazität (20) aufweist, wobei die Lampe (23) in dieser Diagonalen in Reihe mit der Drosselspule und parallel zu der Kapazität angeordnet ist, die Unterbrecher (T1 bis T4) gleichzeitig wechselweise geöffnet und geschlossen werden, die Unterbrechungseinspeisung einen Impulsgenerator (24) und Mittel zum Einstellen der Impulse aus ihrer Richtung auf einen Wert unter der Resonanzfrequenz aufweist, und mit einem mit der Lampe (23) verbundenen Detektororgan (31) zum Detektieren des Stromdurchgangs in ihr, dadurch gekennzeichnet, daß der Impulsgenerator (24) so ausgebildet ist, daß die Impulse an den Klemmen der Brücke eine variable bzw. ansteigende und dann abfallende Frequenz beim Durchlauf eines Frequenzbandes zwischen einem Wert unterhalb und einem Wert oberhalb der Resonanzfrequenz des Stromkreises oder einer seiner Hartmonischen aufweisen und der Winkel des Übergangs so klein ist, daß bei Resonanz der Strom, der die Lampe und die Unterbrecher durchsetzt, auf einen zulässigen Wert begrenzt ist, und daß das Detektororgan (31) für den Stromdurchgang durch die Lampe während ihrer Zündung einen solchen Steuerimpuls an den Generator (24) abgibt, daß der Durchlauf der Frequenz augenblicklich unterdrückt wird und die Spannung an den Klemmen der Brücke auf eine Frequenz unter der Resonanzfrequenz zurückgeführt wird, während der Winkel des Übergangs auf einen optimalen Wert angehoben wird.
  3. Vorrichtung zur Durchführung des Verfahrens nach Anspruch 2, dadurch gekennzeichnet, daß die elektronischen Unterbrecher (T1 bis T4) als Transistoren ausgebildet sind, die an ihrem Steuereingang mit den Spannungsimpulsen beaufschlagt sind, die von dem Generator kommen und den Durchgang oder die Sperre der Transistoren bewirken.
  4. Vorrichtung zur Durchführung des Verfahrens nach Anspruch 3, dadurch gekennzeichnet, daß die Spannungsimpulse beim Durchgang durch die Wicklungen eines Isolationstransformators (28) gebildet sind.
  5. Vorrichtung zur Durchführung des Verfahrens nach einem der Ansprüche 2 bis 4, dadurch gekennzeichnet, daß der Impulsgenerator (24) einen Stromkreis, der ein Sägezahnsignal abgibt, dessen Amplitude und die Periode zwischen zwei festgelegten Kippwerten variieren, Mittel (37 bis 40) zum Erzeugen - ausgehend von diesem Signal - einer Variation der Kippfrequenz bzw. eines Anstiegs und dann eines Abfalls und Mittel (42 bis 45) zum gleichzeitigen Einstellen der Periode und der Dauer der Spannungsimpulse aufweist, die entsprechend der Variation der Kippfrequenz in einem Winkel des Übergangs mit konstantem Wert beim Durchgang durch das ganze Band agbegeben werden.
  6. Vorrichtung zur Durchführung des Verfahrens nach Anspruch 2, dadurch gekennzeichnet, daß der Detektor für den Zündstrom durch die Lampe von einer entsprechenden Drosselspule (31) gebildet ist, die um einen Leiter angeordnet ist, der mit einer der Elektroden der Lampe verbunden ist und in dem der Stromdurchgang nach der Zündung durch ein Spannungssignal wie die Variation des festgestellten Stromes auf den Impulsgenerator (24) einwirkt und die Kippfrequenz auf ihren unteren Wert des Bandes zurückführt, wo er unterhalb der Resonanzfrequenz ist, wobei der Winkel des Übergangs der Impulse gleichzeitig auf einen erhöhten Wert zurückgeführt wird.
  7. Vorrichtung zur Durchführung des Verfahrens nach Anspruch 2, dadurch gekennzeichnet, daß der Detektor für die Zündung der Lampe ein optischer Detektor oder ein mit HALL-Effekt arbeitender Detektor ist.
EP19870402640 1986-12-04 1987-11-24 Verfahren und Vorrichtung zur Zündung von Entladungslampen Expired - Lifetime EP0271396B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR8616969 1986-12-04
FR8616969A FR2607996B1 (fr) 1986-12-04 1986-12-04 Procede et dispositif pour l'allumage de lampes a decharge

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EP0271396A1 EP0271396A1 (de) 1988-06-15
EP0271396B1 true EP0271396B1 (de) 1993-07-28

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EP19870402640 Expired - Lifetime EP0271396B1 (de) 1986-12-04 1987-11-24 Verfahren und Vorrichtung zur Zündung von Entladungslampen

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EP (1) EP0271396B1 (de)
DE (1) DE3786762T2 (de)
ES (1) ES2046212T3 (de)
FR (1) FR2607996B1 (de)

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GB8829844D0 (en) * 1988-12-21 1989-02-15 Yazdanian Sirous Control of fluorescent lights etc
US4999546A (en) * 1989-01-30 1991-03-12 Kabushiki Kaisha Denkosha Starting device for discharge tube
EP0408121B1 (de) * 1989-07-10 1995-06-14 Philips Electronics North America Corporation Schaltungsanordnung
DE4123187A1 (de) * 1991-07-12 1993-01-14 Tridonic Bauelemente Vorschaltgeraet zum pulsbetrieb von gasentladungslampen
GB2261332B (en) * 1991-11-06 1996-05-08 Horizon Fabrications Ltd Driving circuit for electrical discharge devices
CH686390A5 (de) * 1992-10-12 1996-03-15 Juerg Nigg Verfahren zum betrieb einer gasentladungs- oder fluoreszenzlampe und vorschaltgeraet zu dessen ausfuehrung
IT1266242B1 (it) * 1993-02-04 1996-12-27 Ocem Spa Metodo per l'alimentazione di una pluralita' di lampade a scarica, o fluorescenti,collegate in serie ed apprecchiature che attua tale
DE19608658C1 (de) * 1996-03-06 1997-05-07 Bosch Gmbh Robert Schaltungsanordnung zum Zünden und Betreiben einer Hochdruckgasentladungslampe
WO1998035538A1 (de) * 1997-02-08 1998-08-13 Robert Bosch Gmbh Verfahren zum auffinden der resonanzfrequenz eines elektrischen schwingkreises
EP0984670B1 (de) 1998-06-13 2009-12-09 Greenwood Soar IP Limited Vorschaltgerät für eine Starkstromentladungslampe
GB9812703D0 (en) * 1998-06-13 1998-08-12 Simsoarica Limited High intensity discharge lamp ballast
US6495971B1 (en) 1998-06-13 2002-12-17 Hatch Transformers, Inc. High intensity discharge lamp ballast
GB9825298D0 (en) 1998-11-18 1999-01-13 Microlights Ltd An electronic ballast
FR2803977A1 (fr) * 2000-01-19 2001-07-20 High Distrib Appareil electrique, notamment element eclairant a fluorescence, ayant un circuit d'alimentation comprenant un convertisseur asservi
DE10200053A1 (de) 2002-01-02 2003-07-17 Patent Treuhand Ges Fuer Elektrische Gluehlampen Mbh Betriebsgerät für Entladungslampen mit Vorheizeinrichtung
US7589480B2 (en) 2006-05-26 2009-09-15 Greenwood Soar Ip Ltd. High intensity discharge lamp ballast
CN110677951B (zh) * 2019-09-24 2023-12-08 华南理工大学 一种用于超高压汞灯的全桥谐振电路及控制方法

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US4053813A (en) * 1976-03-01 1977-10-11 General Electric Company Discharge lamp ballast with resonant starting
US4071812A (en) * 1976-03-01 1978-01-31 General Electric Company AC Inverter with constant power output
US4388563A (en) * 1981-05-26 1983-06-14 Commodore Electronics, Ltd. Solid-state fluorescent lamp ballast

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Publication number Publication date
FR2607996B1 (fr) 1989-03-10
EP0271396A1 (de) 1988-06-15
DE3786762D1 (de) 1993-09-02
ES2046212T3 (es) 1994-02-01
FR2607996A1 (fr) 1988-06-10
DE3786762T2 (de) 1993-11-11

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