AU619236B2

AU619236B2 – Circuit arrangement for igniting and operating gas discharge lamps
– Google Patents

AU619236B2 – Circuit arrangement for igniting and operating gas discharge lamps
– Google Patents
Circuit arrangement for igniting and operating gas discharge lamps

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Publication number
AU619236B2

AU619236B2
AU27953/89A
AU2795389A
AU619236B2
AU 619236 B2
AU619236 B2
AU 619236B2
AU 27953/89 A
AU27953/89 A
AU 27953/89A
AU 2795389 A
AU2795389 A
AU 2795389A
AU 619236 B2
AU619236 B2
AU 619236B2
Authority
AU
Australia
Prior art keywords
capacitor
circuit
parallel
choke
series
Prior art date
1987-12-18
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.)

Ceased

Application number
AU27953/89A
Other versions

AU2795389A
(en

Inventor
Otmar Bitsche
Wolfgang Grabner
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.)

Stylux-Gesellschaft fur Lichtelektronik Mbh

Original Assignee
STYLUX GES fur LICHTELEKTRONIK
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.)
1987-12-18
Filing date
1988-12-16
Publication date
1992-01-23

1988-12-16
Application filed by STYLUX GES fur LICHTELEKTRONIK
filed
Critical
STYLUX GES fur LICHTELEKTRONIK

1989-07-19
Publication of AU2795389A
publication
Critical
patent/AU2795389A/en

1992-01-23
Application granted
granted
Critical

1992-01-23
Publication of AU619236B2
publication
Critical
patent/AU619236B2/en

2008-12-16
Anticipated expiration
legal-status
Critical

Status
Ceased
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

H05B41/02—Details

H05B41/04—Starting switches

H05B41/042—Starting switches using semiconductor devices

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

H05B41/16—Circuit arrangements in which the lamp is fed by dc or by low-frequency ac, e.g. by 50 cycles/sec ac, or with network frequencies

H05B41/18—Circuit arrangements in which the lamp is fed by dc or by low-frequency ac, e.g. by 50 cycles/sec ac, or with network frequencies having a starting switch

Description

I
‘6 &E 9 3 fi01 DATE T~ ENTIONALE AN INTERNATIONALE ZU, AOJP DATE l~ (51) Internationale Pafientklassifikation 4: 41/04, 41/18 Al APPLN.- ID 27953 89 7/08/89 PCT NUMBER PCI/AT88/00113 (11) Internationale Ver6ffentlichungsnummer: WO 89/ 06085 (43) Internationa’ Ver~iffentlicit.kagsdatumn: 29. Juni 1989 (29.06.89) (21) Internationales Aktenzeichen: PCT/AT88/001 13 (22) Internationales Anmeldedatum: 16. Dezember 1988 (16.12.88) (81) Bestimmungsstaaten: AT (europiiisches Patent), AU, BE (europiiisches Patent), CR (europ~isches Patent), DE (europiiisches Patent), DK, FI, FR (euroyiisches Patent), GB (europiiisches Patent), HU, IT (europilisches Patent), JP, LU (europitisohes Patent), NL (europ~qisches Patent), NO, SE (europgisches Patent), us.
(31) Priori tAitsaktenzeichen: (32) Prioritiitsdatum: (33) Prioritiitsland: A 3348/87 18. Dezember 1987 (18.12.87) Veroffentlicht A’it internationalem Recherchenberichi.
(71) Aninelder (ir alle Bestimmungsstaaten ausser US): STYLUX-GESELLSCHAFT FUR LIGHTELEK- TRONIK M.B.H. [AT/AT]; Puntig-amer Strage 161, A-8055 Graz (AT).
(72) Erfinder;und Erfinder/Anmelder (nur jir US) GRABNER, Wolfgang [AT/AT]; Ziegelstr. 15 c, A-8045 Graz BIT- SCHE, Otmar [AT/AT]; Baiernstr. 53, A-8020 Graz
(AT).
(74) Anwalt: KRAUSE, Peter; Elin-Union Aktiengesellschaft ftir elektrische Industrie, Penzinger Strage 76, A- 1141 Wien (AT).
(54) Title: CIRCUIT ARRANGEMENT FOR IGNITING AND OPERATING GAS DISCHARGE LAMPS (54) Bezeichnung: SCHALTUNGSANORDNUNG FOR DIE ZJNDUNG UND DEN BETRIEB VON GASENTLA-
DUNGSLAMPEN
(57) Abstract 0 A novel circuit for igniting and operat- L2 L2 ing gas discharge lamps, in particular metal 1 vapour lamps, comprises a buffer capacitor+ (C4) connected to a direct-current voltage -C4 Ci C2 L 2) and connected in paralel with a circuit con- s D sisting of a choke and a capacitor connected in S serames aLI trasito And recovery dwiod o 2. f serimes (LI trasito and l reconic y switch o 2 is conn Iected I.in parallel with the capacitor A second choke-capacitor series circuit
I
(L2, C3) connected in series with the metal vapour lamp is connected in parallel with the capacitor which is connected in parallel with the electronic switch A second capacitor (C2) is directly connected in parallel with the the metal vapour lami~p The ignition circuit and the power supply circuit for the metal vapour lamp are combined in this fluorescent lamp ballast, thus obviating the need for a separate ignition circuit. Ir addition, the circuit operates independently of the supply voltage.
(57) Zusamnienfassung Eine neuartige Schaltung fiar die Zfindung und den Betrieb von Gasentladungslampen, die besonders ffir Metalldampflampen geeignet ist, besteht aus einer einem an einer Gleichspannung 2) liegenden Pufferkondensator (C4) parallel geschalteten Drossel-Kondensator-Serienschaltung (LI, Cl). Dem Kondensator (Cl) ist emn elektronischer Schalter z.B. emn Transistor und eine Freilaufdiode parallel geschaltet. Eine weitere Drossel-Kondensator-Serienschialtung (L2, C3) die mit der Metalldampflampe in Serie liegt ist parallel zum Kondensator dem der elektronische Schalter parallel geschaltet ist, angeordnet. Der Metalldampflampe ist noch direkt emn Kondensator (C2) parallel geschaltet. Bei diesern Vorschaltgerdt ist-der-Zilndkreis und der Versorgungskreis ftir die Metalldampflampe kombiniert, wodurch kein eigener Ziindkteis notwendig ist. Au1gerdem arbeitet die Schaltung unabhiigig von der Versorgungsspannung.
_I
Attorney’s Docket No. 8092 PCT-kenc4 PCT WORLD INTELLECTUAL PROPERTY ORGANIZATION (International Bureau) INTERNATIONAL APPLICATION PUBLISHED UNDER THE PATENT COOPERATION TREATY (PCT) S(51) International Patent Classification: H05B 41/04, 41/18 S(11) International Publication No.: WO 89/06085 (43) International Date of Publication: June 29, 1989 (21) International Serial No.: PCT/AT88/00113 (22) International Date of Filing: December 16, 1988 (31) Priority Serial No.: A 3348/87 (32) Date of priority: December 18, 1987 (33) Country of Priority: Austria (AT) (71) Applicant (for all designated States except the United States of America): STYLUX-GESELLSCHAFT FUR LICHTELEKTRONIK M.B.H. (Austria): Puntigamer Strasse 161, A-8055 Graz (Austria) (72) Inventor: and Inventor/Applicant (only for the United States of America): GRABNER, Wolfgang (Austrian); Ziegelstrasse 1 A-8045 Graz (Austria). BITSCHE, Otmar (Austrian); Baiernstrasse 53, A-8020 Graz (Austria) (74) Attornev: KRAUSE, Peter; Elin-Union Aktiengesellschaft fir elektrische Industrie, Penzinger Strasse 76, A-1141, Vienna (Austria) (81) Designated States: AT (European Patent), AU, BE (European Patent), CH (European Patent), DE (European Patent), DK, FI, FR (European Patent), GB (European Patent), HU, IT (European Patent), JP, LU (European Patent), NL «I (European Patent), JP, SE (European Patent), NL (European Patent), NO, SE (European Patent), US Published: with International Search Report (54) Title: CIRCUIT ARRANGEMENT FOR IGNITING AND OPERATING GAS-DISCHARGE LAMPS (57) Abstract: A new kind of circuit for igniting and operating gas-discharge lamps, which circuit is particularly suitable for metal-vapor lamps, comprises a choke-capacitor series circuit (L1, Cl) connected in parallel with a buffer capacitor (C4) connected to a direct current voltage An electronic switch for instance a transistor, and a recovery diode (D) are connected in parallel with the capacitor A further 2
AVS>,
7,.
i: choke-capacitor series circuit (L2, C3) connected in series with the metal-vapor lamp is arranged in parallel with the capacitor, (Cl) with which the electronic switch is connected in parallel. A further capacitor (C2) is directly connected in parallel with the metal-vapor lamp In this ballast the ignition circuit and the supply circuit for the metal-vapor lamp are combined, thus obviating the need for a separate ignition circuit. Furthermore, the circuit operates independently of the supply voltage.
i .1 .4\ 3 WO 89/06085 PCT/AT88/00113 CIRCUIT ARRANGEMENT FOR IGNITING AND OPERATING GAS-DISCHARGE LAMPS The invention relates to a circuit arrangement for igniting and operating gas-discharge lamps, particularly metal-vapor lamps.
An almost endless v.-itey of circuits for ballasts of gas-discharge lamps are known for a long time. Every one of these circuits employs for ignition the glow starter arranged Iin parallel with the lamp and, for current limitation during operation, the choke which is connected in series with the gas-discharge lamp. In these arrangements with glow starter and choke, no flicker-free instantaneous start is effected and, furthermore, lamp burning is not stable. The influence of mains voltage fluctuations on the lighting current of the lamp is likewise not inconsiderable. Since the glow starter comprises a mechanical switch which is a thermostatic bimetal switch, the risk of failure of the latter is relatively high.
Electronic ballasts have been developed to avoid these disadvantages. A circuit of this type is described in German Patent No. 31 52 342. Such circuit consists of a current I 4 source, an ignition circuit, a control element and an auxiliary voltage source. -However, such a ballast requires a great deal of components and is therefore also quite susceptible to failure. Furthermore, it is conceived particularly for fluorescent lamps which require a lower ignition voltage than metal-vapor lamps. This ballast is thus entirely unsuitable for metal-vapor lamps.
The object of the invention is thus to provide an electronic ballast particularly for metal-vapor lamps requiring a high ignition voltage in the range of 2 kV to 5 kV.
The object is achieved by the invention. This is characterized in that a buffer capacitor, preferably an electrolytic capacitor, is connected to a rectified voltage, preferably the mains voltage rectified by means of a bridge rectifier, a choke-capacitor series circuit being in parallel with the buffer capacitor, whereby an electronic switch, preferably a transistor or thyristor, and a fast recovery diode forming part of the electronic switch are connected in parallel with the capacitor, and that the gas-discharge lamp provided with a parallel capacitor is connected by means of a further choke-capacitor series circuit to the parallel circuit consisting of capacitor, electronic switch and fast recovery diode. In this new type of ballast, the ignition circuit and the supply circuit are combined and can be considered as one 5 io KaAVS 0< /W M unit. Therefore, a separate ignition circuit is also not required. Furthermore, the circuit operates independently of the supply voltage. Moreover, the gas-discharge lamp is always supplied with constant power. This even then when the lamp burning voltage changes, such burning voltage increasing with the age of the lamp. An embodiment of the invention is characterized in that a further choke is provided in series with the parallel circuit consisting of capacitor, electronic switch and fast recovery diode. In this manner, the structural size of the two already existing chokes can be kept small. It is advantageous that the choke of the further choke-capacitor series circuit is arranged in series with the parallel circuit consisting of capacitor, electronic switch and fast recovery diode. By virtue of this arrangement, the ballast according to the invention is excellently suitable for gas-discharge lamps with an ignition voltage less than 2 kV. The invention will now be described in still greater detail in conjunction with the drawing. Figure 1 shows the basic circuit of the electronic ballast, Figure 2 shows the augmented circuit having three chokes, and Figure 3 shows the circuit for lamps with an ignition voltage of less than 2 kV. 'I ~6 In all three Figures there is a direct current voltage applied at the terminals 1, 2, which is normally the mains voltage rectified by means of a bridge rectifier. At this direct current voltage there is placed a buffer or smoothing capacitor C4. This is generally an electrolytic capacitor having a high capacitance value. In the circuit depicted in Figure 1, a choke-capacitor series circuit LI, Cl is connected in parallel with the buffer capacitor C4. An electronic switch S, which is customarily a transistor or thyristor, as well as a fast recovery diode D are connected in parallel with the capacitor Cl of this series circuit consisting of LI, Cl. Furthermore, in the circuit of the electronic ballast according to Figure 1 there is arranged a second choke-capacitor series circuit L2, L3 in parallel with the capacitor CI, this second chokecapacitor series circuit being connected in series with the gas-discharge lamp L. Furthermore, the aas-discharge lamp L comprises a parallel capacitor C2. The circuit depicted in Figure 2 is basically identical with the circuit in Figure 1. However, there is additionally provided a third choke L3 which is arranged in series with the capacitor Cl. -7 A further variant of the embodiment of the electronic ballast according to the invention is illustrated in Figure 3. In this variant the choke L2 series-connected to the capacitor C3 has been eliminated. Consequently, only the two chokes Ll, L3 are provided in this circuit. The circuits apparent from the three Figures are based on a series resonance circuit, whereby in each case there are provided a main oscillating circuit and a load circuit. The main oscillating circuit depicted in Figure 1 consists of the choke Ll and the capacitor CI. On the other hand, the main oscillating circuit in Figures 2 and 3 is structured by the two chokes Ll, L3 and the capacitor CI. The choke L2 and the two capacitors C2, C3 form the load circuit in Figures 1 and 2, while in Figure 3 the choke L3 is part of the load circuit, since the choke L2 does not exist. The gas-discharge lamp L represents the consumer. The electronic switch S has to definedly excite the respective series resonance circuit. The smoothing capacitor C4 has to be dimensioned such that it I always makes available the supply voltage which is required for Sthe resonance circuit and is above all intermittence-free. For a stable oscillation behavior of the series resonance circuit, the inductances of the chokes L, L2 as well as the capacitances of the capacitors Cl, C2 must be in a predeternminate relationship to one another. The choke L2 in Figure 1 and Figure 2 serves for adapting the voltage ratios in 8 the load circuit and at the gas-discharge lamp L, as well as for compensating the phase position of the main oscillating circuit. In the circuit of the ballast according to Figure 3, the choke L3 takes over the above task of the choke L2. The additional choke L3 in Figure 2 is required for fine tuning of the series resonance circuit in unstable consumers. In the circuits of the three Figures there has been selected in each case the negative potential as the common reference point. The positive potential could also be considered to be the common reference point, whereby the function of the circuit is perfectly preserved. Finally, the mode of operation of the circuit during ignition and operation will now be described. Prior to ignition or at the moment of ignition the gas-discharge lamp represents a high-ohmic load. In this operating instance the circuits operate as step-up transducers or as high-voltage ignition generators, whereby several kV high voltage are generated depending upon dimensioning. The frequency determining components in the series resonance circuit at the moment of ignition are the capacitances of the capacitors Cl, C2, C3 in all three circuits, plus tie S9 i; i inductance of the choke L2 in Figure 1, the inductances of the chokes L2, L3 in-Figure 2 and the inductance of the choke L3 in Figure 3. The frequency of these resonance circuits upon ignition is a multiple of the frequency of the respective main oscillating circuit. By appropriate dimensioning of the capacitor C2 as a function of the capacitor C1 there is generated a high voltage of several kV at the gas-discharge lamp L as well as at the capacitor C2 itself, whereby the gas-discharge lamp L is ignited. When the gas-discharge lamp L ignites as a result of a high voltage generated at the capacitor C2, this high voltage will abruptly break down at this capacitor C2 and at the gas-discharge lamp L. The oscillating-circuit frequency thereby decreases to that of the main oscillating circuit. Then only the operating voltage of the gas-discharge lamp L lies at the capacitor C2. The circuits in the three Figures now operate as step-down transducers, whereby the maximum oscillating-circuit voltage is divided between the components in the load circuit. The required energy for operating the gas-discharge lamp L is transferred from the main oscillating circuit to the load circuit and made available to the lamp L. 10 V aQ S T O Claims (3) 1. Circuit arrangement for igniting and operating' gas-discharge lamps, particularly metal-vapor lamps, characterized in that a buffer capacitor preferably an electrolytic capacitor, is connected to a rectified voltage preferably the mains voltage rectified by means of a bridge rectifier, a choke-capacitor series circuit (Ll, Cl) being connected in parallel with the buffer capacitor, whereby an electronic switch preferably a transistor or thyristor, and a fast recovery diode forming part of the electronic switch are connected in parallel with the capacitor and that the gas-discharge lamp provided with a parallel capacitor (C2) is connected by means of a further choke-capacitor series circuit (L2, C3) to the parallel circuit consisting of capacitor electronic switch and fast recovery diode 2. Circuit arrangement according to claim I, characterized in that a further choke (L3) is provided in series with the parallel circuit consisting of capacitor electronic switch and fast recovery diode 1 0 L_ i 3. Circuit arrangement according to claim 1, characterized in that the choke (L2) of the further choke-capacitor series circuit (L2, C3) is arranged in series with the parallel circuit consisting of capacitor electronic switch (S) and fast recovery diode j i 23 i-12 A4^' 1 L AU27953/89A 1987-12-18 1988-12-16 Circuit arrangement for igniting and operating gas discharge lamps Ceased AU619236B2 (en) Applications Claiming Priority (3) Application Number Priority Date Filing Date Title AT3348/87 1987-12-18 AT0334887A AT397326B (en) 1987-12-18 1987-12-18 CIRCUIT FOR THE IGNITION AND OPERATION OF GAS DISCHARGE LAMPS PCT/AT1988/000113 WO1989006085A1 (en) 1987-12-18 1988-12-16 Circuit arrangement for igniting and operating gas discharge lamps Publications (2) Publication Number Publication Date AU2795389A AU2795389A (en) 1989-07-19 AU619236B2 true AU619236B2 (en) 1992-01-23 Family ID=3549182 Family Applications (1) Application Number Title Priority Date Filing Date AU27953/89A Ceased AU619236B2 (en) 1987-12-18 1988-12-16 Circuit arrangement for igniting and operating gas discharge lamps Country Status (11) Country Link US (1) US5057752A (en) EP (1) EP0383831B1 (en) JP (1) JPH03501790A (en) AT (1) AT397326B (en) AU (1) AU619236B2 (en) DE (1) DE3887527D1 (en) DK (1) DK147990D0 (en) FI (1) FI93297C (en) HU (1) HU206175B (en) NO (1) NO174449C (en) WO (1) WO1989006085A1 (en) Families Citing this family (10) * Cited by examiner, † Cited by third party Publication number Priority date Publication date Assignee Title US5339004A (en) * 1991-10-02 1994-08-16 First Lighting, Inc. Regulating ballast with power factor correction for high-frequency gaseous discharge lamps US5426350A (en) * 1993-11-18 1995-06-20 Electric Power Research Institute, Inc. High frequency transformerless electronics ballast using double inductor-capacitor resonant power conversion for gas discharge lamps US5459377A (en) * 1993-12-28 1995-10-17 Yue Zheng Method for starting gas-conducting lamp and lamp for carrying out the method DE19530746A1 (en) * 1995-08-22 1997-02-27 Bosch Gmbh Robert Circuit arrangement for operating a high-pressure gas discharge lamp with alternating current US5798615A (en) * 1996-08-30 1998-08-25 Unitrend Power Technology, Corp. Universal high intensity discharge electronic starter US6147455A (en) * 1999-06-02 2000-11-14 General Electric Company Gas discharge lamp ballast circuit with electronic starter US6153983A (en) * 1999-07-21 2000-11-28 General Electric Company Full wave electronic starter US6597128B2 (en) 2001-10-03 2003-07-22 Hubbell Incorporated Remote discharge lamp ignition circuitry JP4697076B2 (en) * 2006-07-12 2011-06-08 富士ゼロックス株式会社 Image forming apparatus and replacement parts thereof WO2012164588A1 (en) * 2011-05-31 2012-12-06 Giacomo Srl High-efficiency electronic device for turning on and power supplying of lamps Citations (2) * Cited by examiner, † Cited by third party Publication number Priority date Publication date Assignee Title GB2057795A (en) * 1979-08-07 1981-04-01 Eleco Ltd Improvements in or relating to operating circuits for electric discharge lamps GB2204751A (en) * 1987-04-22 1988-11-16 Davis Group Ltd Discharge lamp circuits Family Cites Families (6) * Cited by examiner, † Cited by third party Publication number Priority date Publication date Assignee Title AT369609B (en) * 1980-09-11 1983-01-25 Elger Elektro Neon CIRCUIT ARRANGEMENT FOR THE OPERATION OF GAS DISCHARGE LAMPS DE3108547A1 (en) * 1981-03-06 1982-10-07 Patent-Treuhand-Gesellschaft für elektrische Glühlampen mbH, 8000 München "IGNITION SWITCH FOR A HIGH PRESSURE METAL STEAM DISCHARGE LAMP" DE3327030A1 (en) * 1983-07-27 1985-02-07 Philips Patentverwaltung Gmbh, 2000 Hamburg CIRCUIT ARRANGEMENT FOR OPERATING HIGH PRESSURE GAS DISCHARGE LAMPS DE3420229A1 (en) * 1984-05-30 1985-12-05 Frank 3013 Barsinghausen Hansmann Circuit arrangement for operating metal-vapour discharge lamps US4683404A (en) * 1986-09-29 1987-07-28 Cooper Industries Starting circuit and apparatus for high pressure sodium lamps EP0337554A1 (en) * 1988-04-13 1989-10-18 Koninklijke Philips Electronics N.V. Switching arrangement 1987 1987-12-18 AT AT0334887A patent/AT397326B/en not_active IP Right Cessation 1988 1988-12-16 WO PCT/AT1988/000113 patent/WO1989006085A1/en active IP Right Grant 1988-12-16 JP JP1500275A patent/JPH03501790A/en active Pending 1988-12-16 AU AU27953/89A patent/AU619236B2/en not_active Ceased 1988-12-16 US US07/474,802 patent/US5057752A/en not_active Expired - Fee Related 1988-12-16 HU HU89392A patent/HU206175B/en not_active IP Right Cessation 1988-12-16 DE DE89900168T patent/DE3887527D1/en not_active Expired - Fee Related 1989 1989-07-05 EP EP89900168A patent/EP0383831B1/en not_active Expired - Lifetime 1990 1990-06-14 FI FI902988A patent/FI93297C/en not_active IP Right Cessation 1990-06-15 NO NO902691A patent/NO174449C/en unknown 1990-06-15 DK DK147990A patent/DK147990D0/en unknown Patent Citations (2) * Cited by examiner, † Cited by third party Publication number Priority date Publication date Assignee Title GB2057795A (en) * 1979-08-07 1981-04-01 Eleco Ltd Improvements in or relating to operating circuits for electric discharge lamps GB2204751A (en) * 1987-04-22 1988-11-16 Davis Group Ltd Discharge lamp circuits Also Published As Publication number Publication date JPH03501790A (en) 1991-04-18 DK147990A (en) 1990-06-15 NO174449B (en) 1994-01-24 AT397326B (en) 1994-03-25 DK147990D0 (en) 1990-06-15 HU206175B (en) 1992-08-28 FI93297C (en) 1995-03-10 EP0383831A1 (en) 1990-08-29 WO1989006085A1 (en) 1989-06-29 FI902988A0 (en) 1990-06-14 NO902691L (en) 1990-06-15 NO174449C (en) 1994-05-04 DE3887527D1 (en) 1994-03-10 ATA334887A (en) 1993-07-15 FI93297B (en) 1994-11-30 EP0383831B1 (en) 1994-01-26 AU2795389A (en) 1989-07-19 US5057752A (en) 1991-10-15 NO902691D0 (en) 1990-06-15 HUT58437A (en) 1992-02-28 HU890392D0 (en) 1991-11-28 Similar Documents Publication Publication Date Title Gulko et al. 1997 A MHz electronic ballast for automotive-type HID lamps KR100354728B1 (en) 2003-01-15 Circuit appangement for the production of voltage pulse sequences, in particular for the operation of dielectrically impeded discharges US3917976A (en) 1975-11-04 Starting and operating circuit for gaseous discharge lamps EP0440245B1 (en) 1995-04-05 Power source circuit CN1857037A (en) 2006-11-01 Circuit for operating high-pressure discharge lamps AU619236B2 (en) 1992-01-23 Circuit arrangement for igniting and operating gas discharge lamps US3700956A (en) 1972-10-24 Arc discharge lamp control circuit US6337800B1 (en) 2002-01-08 Electronic ballast with inductive power feedback US4484107A (en) 1984-11-20 Discharge lamp lighting device and system FI110154B (en) 2002-11-29 Electronic ballast for a high intensity discharge lamp EP1260013A2 (en) 2002-11-27 Switchable power converter for multiple level input line power factor correction US5426346A (en) 1995-06-20 Gas discharge lamp ballast circuit with reduced parts-count starting circuit US4143304A (en) 1979-03-06 Positive starting and operating apparatus for high-pressure sodium lamps US7170235B2 (en) 2007-01-30 Circuit arrangement with a separate resonant igniter for a high-pressure discharge lamp US4337417A (en) 1982-06-29 Starting and operating apparatus for high-pressure sodium lamps KR100202336B1 (en) 1999-06-15 Circuit arrangement US6674249B1 (en) 2004-01-06 Resistively ballasted gaseous discharge lamp circuit and method US4187449A (en) 1980-02-05 Discharge lamp operating circuit KR0169164B1 (en) 1999-04-15 Rapid start type fluorescent lamp starting circuit WO2004071136A1 (en) 2004-08-19 Circuit arrangement US6198232B1 (en) 2001-03-06 Discharge lamp circuit with dual ignition coils US6294882B1 (en) 2001-09-25 Circuit arrangement with improved power-factor for feeding a discharge lamp JPH08264285A (en) 1996-10-11 Lighting device GB2117193A (en) 1983-10-05 Electric discharge lamp operating circuit RU2044417C1 (en) 1995-09-20 High-frequency power supply source for gaseous-discharge lamps
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