EP1395096A2 - Verfahren zum Betreiben von Leuchtstofflampen und Vorschaltgerät - Google Patents
Verfahren zum Betreiben von Leuchtstofflampen und Vorschaltgerät Download PDFInfo
- Publication number
- EP1395096A2 EP1395096A2 EP03017859A EP03017859A EP1395096A2 EP 1395096 A2 EP1395096 A2 EP 1395096A2 EP 03017859 A EP03017859 A EP 03017859A EP 03017859 A EP03017859 A EP 03017859A EP 1395096 A2 EP1395096 A2 EP 1395096A2
- Authority
- EP
- European Patent Office
- Prior art keywords
- control loop
- fluorescent lamp
- time intervals
- actual value
- power consumption
- 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.)
- Granted
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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
- H05B41/36—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
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B41/00—Circuit arrangements or apparatus for igniting or operating discharge lamps
- H05B41/14—Circuit arrangements
- H05B41/26—Circuit arrangements in which the lamp is fed by power derived from DC by means of a converter, e.g. by high-voltage DC
- H05B41/28—Circuit arrangements in which the lamp is fed by power derived from DC by means of a converter, e.g. by high-voltage DC using static converters
- H05B41/295—Circuit arrangements in which the lamp is fed by power derived from DC by means of a converter, e.g. by high-voltage DC using static converters with semiconductor devices and specially adapted for lamps with preheating electrodes, e.g. for fluorescent lamps
- H05B41/298—Arrangements for protecting lamps or circuits against abnormal operating conditions
- H05B41/2988—Arrangements for protecting lamps or circuits against abnormal operating conditions for protecting the lamp against abnormal operating conditions
Definitions
- the invention relates to a method for operating fluorescent lamps according to of the preamble of claim 1 and a ballast for performing the Process.
- the inventive method for operating fluorescent lamps with the help of a ballast that has an inverter with semiconductor switches in a Bridge circuit are arranged, and with a control device for the semiconductor switch and at least one connected to the inverter as a resonance circuit trained load circuit in which at least one fluorescent lamp is operated, the at least one fluorescent lamp from the inverter a high-frequency current is applied and the power consumption the at least one fluorescent lamp by means of a first control loop by varying the frequency of the high-frequency current to a predeterminable one Value is characterized by the fact that by means of a second control loop which is run in shorter time intervals than the first control loop, the power consumption of the at least one fluorescent lamp on the predeterminable Value is stabilized.
- the second control loop ensures that the fluorescent lamps also in the critical power range, which approx. 25% to 10% of their nominal luminous flux corresponds, can be operated safely without the occurrence of significant Fluctuations in the power consumption or brightness of the fluorescent lamps.
- the second control loop is in significantly shorter time intervals than the go through first control loop and can therefore make rapid changes in power consumption of fluorescent lamps, as in the aforementioned critical area counteract.
- the time intervals for going through the second control loop are advantageously 50 ⁇ s to 200 ⁇ s, while the Time intervals for passing through the first control loop with preferably 1 ms to 2 ms are significantly longer.
- the method according to the invention is advantageously used for implementation of the first control loop, a setpoint which is adjustable in size in predetermined Time intervals compared with an actual value, which is based on the time-average power consumption deriving at least one fluorescent lamp, and therefrom a first manipulated variable is formed for the control device while performing the second control loop at predetermined time intervals that are shorter than the time intervals the first control loop, the change in power consumption at least one fluorescent lamp for generating a second manipulated variable for the Control device is evaluated, and both manipulated values for generating control signals be evaluated for the control of the switching frequency of the semiconductor switch.
- control variables are advantageously both for the first as well as for the second control loop from the one flowing through the bridge circuit Current derived because the time average of this current is proportional to the power consumption the fluorescent lamp is.
- the controlled variables that is, the actual values, Both control loops are, for example, using a low-pass filter from the over the Bridge circuit derived current flowing, the time constant of the second Second low-pass filter belonging to the control loop is smaller than the time constant of the first low-pass filter belonging to the first control loop.
- the time constants are each adapted to the above-mentioned time intervals of the control loops.
- the functions of the two low-pass filters are each digital Filters taken with different, at the above-mentioned time intervals adjusted sampling frequencies work.
- the second control loop is advantageously designed as a target / actual value comparison, which is repeated continuously at predetermined time intervals, on End of each time interval from that flowing through the bridge circuit Current an actual value is derived and this with the actual value serving as the setpoint of the immediately preceding time interval is compared in order to derive the generate second manipulated variable for the control device of the inverter.
- the ballast according to the invention has an inverter with semiconductor switches, which are arranged in a bridge circuit, a control device for the semiconductor switches and at least one connected to the inverter, designed as a resonant circuit load circuit with connections for at least one Fluorescent lamp on, wherein the control device means for varying the switching frequency the semiconductor switch has the minimum power consumption set a fluorescent lamp to a predeterminable value, and the control device Means for stabilizing the power consumption of the at least one Has fluorescent lamp to the predetermined value.
- the means for stabilizing the power consumption of the at least one fluorescent lamp are preferably designed as differential controllers, also called D controllers, the change in the power consumption of the at predetermined time intervals monitors at least one fluorescent lamp and, depending on it, one Control value for the control device for stabilizing the power consumption on the predeterminable value generated.
- D controllers differential controllers
- the at least one fluorescent lamp has the desired value according to the invention Ballast preferably a slow compared to the D controller Proportional-integral controller, also called PI controller, on which the temporal average power consumption of the at least one fluorescent lamp with one predeterminable target value compares.
- Both controllers are advantageously a component a microprocessor, which in turn is part of the control device is.
- the manipulated values generated by both controllers are superimposed and in one digital data register of the microprocessor stored.
- FIG. 1 schematically shows the structure of an electronic device according to the invention Ballast shown for operating a fluorescent lamp.
- This ballast has a half-bridge inverter with two half switches, in particular Transistors T1, T2, a control device ST for the semiconductor switch T1, T2 and two connections +, - for the DC voltage supply of the half-bridge inverter.
- a Load circuit designed as a resonant circuit.
- the load circuit includes the Resonance inductance L1, the resonance capacitor C1, the coupling capacitor C2, the discharge resistor R1 and arranged parallel to the coupling capacitor C2 Connections for the electrode filaments E1, E2 of a fluorescent lamp LP.
- the Fluorescent lamp LP is arranged in the load circuit in such a way that its discharge path is connected in parallel with the resonance capacitor C1 and the electrode filaments E1, E2 are connected in series with the resonance capacitor C1.
- This Circuit arrangement is disclosed for example in the patent specification EP 0 422 255 B1.
- the semiconductor switches T1, T2 are alternated by means of the control device ST activated and deactivated so that the load circuit and the lamp LP with one high-frequency current, the frequencies of which are in the range of approx. 40 kHz and 150 kHz are.
- the one for igniting the gas discharge in the fluorescent lamp LP required ignition voltage is determined using the method of excessive resonance provided on the resonance capacitor C1.
- the impedance of the discharge path of the fluorescent lamp LP and their power consumption depend on the frequency of the lamp LP flowing electricity.
- This fact can regulate the power consumption of the Fluorescent lamp and thus also used for its brightness control, by switching frequency of the semiconductor switches T1, T2 by means of the control device ST is varied accordingly so that it is a more or less large distance to the resonant frequency of the damped resonant circuit.
- This actual value is specified in the proportional-integral controller IR with a predefinable one Setpoint value SW compared, that of the control device ST from the outside, for example from a dimming potentiometer or another dimming device becomes.
- the setpoint SW represents the desired brightness level or power level the fluorescent lamp LP.
- the proportional-integral controller IR a first manipulated variable to control the Switching frequency of the semiconductor switches T1, T2.
- the first manipulated variable is in the 14 bit data register S1 stored and read out by the driver switch TR, the control signals generated for the base or gate electrode of the semiconductor switch T1, T2.
- the first control loop is executed at 1 ms intervals. The means that after every 1 ms, a new actual value is generated using the first low pass R3, C3 fed into the proportional-integral controller IR, with the specifiable setpoint SW compared and an updated first manipulated variable written in the data register S1.
- the frequency dependence of the half-bridge current is shown qualitatively in FIG.
- the fluorescent lamp has its greatest brightness and Luminous flux is therefore 100% of their nominal luminous flux. If the frequency is increased, so takes the half-bridge current and thus the power consumption as well Luminous flux of the fluorescent lamp.
- ⁇ f which corresponds to a luminous flux corresponds to approx. 25% to 10% of the nominal luminous flux, shows the half-bridge current an extremely strong frequency dependency, making this region unstable Operating conditions can occur.
- the differential regulator DR To avoid oscillations of the fluorescent lamp between several operating states is avoided by means of the second low-pass filter R4, C4, the differential regulator DR, the data memory S2 and the data register S1 a second control loop realized, which is run much faster than the first control loop. through of the low-pass filter R4, C4 changes in the time intervals of 100 microseconds half-bridge current flowing through the resistor R2 is detected.
- the differential Controller DR carries out a setpoint / actual value comparison at intervals of 100 ⁇ s through, the actual value being evaluated by the low-pass filter R4, C4 Half-bridge current is used and temporarily as the setpoint in data memory S2 stored actual value of the immediately preceding time interval is used becomes.
- the differential Controller DR Depending on the target / actual value comparison, the differential Controller DR generates a second manipulated variable that corresponds to the 14-bit data register S1 is supplied and added to the first manipulated variable. From the sum of the two The driver circuit determines control values for frequency control of the signals Semiconductor switch T1, T2. The half-bridge current is generated by means of the second control loop and thus the power consumption and the brightness of the fluorescent lamp stabilized to the desired value.
- the differential controller DR outside this critical operating area can be deactivated. This happens because that the actual value of the second control loop is compared with a target / actual value comparison Gain factor K is multiplied, which depends on the selected brightness level, that is, from the setpoint SW of the first control loop. During operation the fluorescent lamp LP with more than 25% of its nominal luminous flux can Gain factor K can be reduced to zero.
- Both controllers IR, DR are algorithms of a program-controlled Microprocessor formed, which is part of the control device ST.
- particularly preferred embodiment of the invention are first C3, R3 and second low-pass filter C4, R4 replaced by one digital filter each, wherein the first digital filter functions as the first low-pass filter C3, R3 and the second digital filter takes over the function of the second low-pass filter C4, R4.
- the digital filters are part of the control device ST and in particular as part of the aforementioned, program-controlled microprocessor educated. Both digital filters evaluate the through the bridge circuit flowing current, that is, the voltage drop across resistor R2. Your filter properties are determined by the software implemented in the microprocessor. In all other details, this exemplary embodiment agrees with the above explained first embodiment.
Landscapes
- Circuit Arrangements For Discharge Lamps (AREA)
- Discharge-Lamp Control Circuits And Pulse- Feed Circuits (AREA)
Abstract
Description
- Figur 1
- Eine schematische Darstellung des erfindungsgemäßen Vorschaltgerätes
- Figur 2
- Eine schematische Darstellung der Abhängigkeit des Halbbrückenstroms von der Frequenz des Wechselrichters
Claims (11)
- Verfahren zum Betreiben von Leuchtstofflampen mit Hilfe eines Vorschaltgerätes, das einen Wechselrichter mit Halbleiterschaltern (T1, T2), die in einer Brückenschaltung angeordnet sind, und mit einer Steuervorrichtung (ST) für die Halbleiterschalter (T1, T2) und mindestens einen an den Wechselrichter angeschlossenen, als Resonanzkreis ausgebildeten Lastkreis aufweist, in dem mindestens eine Leuchtstofflampe (LP) betrieben wird, wobei die mindestens eine Leuchtstofflampe (LP) von dem Wechselrichter mit einem hochfrequenten Strom beaufschlagt wird und die Leistungsaufnahme der mindestens einen Leuchtstofflampe (LP) mittels einer ersten Regelschleife durch Variieren der Frequenz des hochfrequenten Stroms auf einen vorgebbaren Wert eingestellt wird,
dadurch gekennzeichnet, dass zusätzlich mittels einer zweiten Regelschleife, die in kürzeren Zeitintervallen durchlaufen wird als die erste Regelschleife, die Leistungsaufnahme der mindestens einen Leuchtstofflampe (LP) auf den vorgebbaren Wert stabilisiert wird. - Verfahren nach Anspruch 1, dadurch gekennzeichnet, dass zur Durchführung der ersten Regelschleife ein in seiner Größe einstellbarer Sollwert in vorgegebenen Zeitabständen mit einem lstwert verglichen wird, der aus der zeitlich gemittelten Leistungsaufnahme der mindestens einen Leuchtstofflampe (LP) abgeleitet wird, und daraus ein erster Stellwert für die Steuervorrichtung (ST) gebildet wird, und wobei zur Durchführung der zweiten Regelschleife in vorgegebenen Zeitintervallen, die kürzer als die Zeitabstände der ersten Regelschleife sind, die Änderung der Leistungsaufnahme der mindestens einen Leuchtstofflampe (LP) zur Erzeugung eines zweiten Stellwertes für die Steuervorrichtung (ST) ausgewertet wird, und beide Stellwerte zum Erzeugen von Steuersignalen für die Regelung der Schaltfrequenz der Halbleiterschalter (T1, T2) ausgewertet werden.
- Verfahren nach Anspruch 1 oder 2, dadurch gekennzeichnet, dass zur Durchführung der ersten Regelschleife ein in seiner Größe einstellbarer Sollwert (SW) in vorgegebenen Zeitabständen mit einem Istwert verglichen wird, der aus dem durch die Brückenschaltung fließenden Strom abgeleitet wird, und wobei zur Durchführung der zweiten Regelschleife in vorgegebenen Zeitintervallen, die kürzer als die Zeitabstände der ersten Regelschleife sind, die Änderung des durch die Brückenschaltung fließenden Stroms ausgewertet wird.
- Verfahren nach Anspruch 3, dadurch gekennzeichnet, dass der Istwert für die erste Regelschleife mittels eines ersten Tiefpassfilters (R3, C3) aus dem durch die Brückenschaltung fließenden Strom abgeleitet wird.
- Verfahren nach Anspruch 3, dadurch gekennzeichnet, dass der Istwert für die erste Regelschleife mittels eines ersten digitalen Filters aus dem durch die Brückenschaltung fließenden Strom abgeleitet wird.
- Verfahren nach den Ansprüchen 2 und 3, dadurch gekennzeichnet, dass während der zweiten Regelschleife ein Soll-Istwertvergleich durchgeführt wird, wobei am Ende eines jeden vorgegebenen Zeitintervalls aus dem durch die Brückenschaltung fließenden Strom ein Istwert abgeleitet wird und dieser mit dem als Sollwert dienenden, Istwert des unmittelbar vorangegangenen Zeitintervalls verglichen wird und daraus der zweite Stellwert für die Steuervorrichtung generiert wird.
- Verfahren nach den Ansprüchen 4 und 6, dadurch gekennzeichnet, dass der Istwert für die zweite Regelschleife mittels eines zweiten Tiefpassfilters (R4, C4) aus dem durch die Brückenschaltung fließenden Strom abgeleitet wird, wobei die Zeitkonstante des zweiten Tiefpassfilters kleiner als die Zeitkonstante des ersten Tiefpassfilters ist.
- Verfahren nach den Ansprüchen 5 und 6, dadurch gekennzeichnet, dass der Istwert für die zweite Regelschleife mittels eines zweiten Tiefpassfilters (R4, C4) aus dem durch die Brückenschaltung fließenden Strom abgeleitet wird, wobei die Zeitkonstante des zweiten Tiefpassfilters kleiner als die Zeitkonstante des ersten Tiefpassfilters ist.
- Verfahren nach Anspruch 1, dadurch gekennzeichnet, dass die vorgegebenen Zeitabstände der ersten Regelschleife eine Länge von 1 ms bis 2 ms besitzen.
- Verfahren nach Anspruch 1, dadurch gekennzeichnet, dass die vorgegebenen Zeitintervalle der zweiten Regelschleife eine Länge von 50 µs bis 200 µs besitzen.
- Vorschaltgerät zum Betrieb von Leuchtstofflampen, wobei das Vorschaltgerät einen Wechselrichter mit Halbleiterschaltern (T1, T2), die in einer Brückenschaltung angeordnet sind, eine Steuervorrichtung (ST) für die Halbleiterschalter (T1, T2) und mindestens einen an den Wechselrichter angeschlossenen, als Resonanzkreis ausgebildeten Lastkreis mit Anschlüssen für mindestens eine Leuchtstofflampe (LP) aufweist, wobei die Steuervorrichtung (ST) Mittel zur Variation der Schaltfrequenz der Halbleiterschalter (T1, T2) besitzt, um die Leistungsaufnahme der mindestens einen Leuchtstofflampe (LP) auf einen vorgebbaren Wert einzustellen,
dadurch gekennzeichnet, dass die Steuervorrichtung Mittel (R4, C4, DR, S2) zur Stabilisierung der Leistungsaufnahme (LP) der mindestens einen Leuchtstofflampe (LP) auf den vorgebbaren Wert besitzt.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE10240807A DE10240807A1 (de) | 2002-08-30 | 2002-08-30 | Verfahren zum Betreiben von Leuchtstofflampen und Vorschaltgerät |
| DE10240807 | 2002-08-30 |
Publications (3)
| Publication Number | Publication Date |
|---|---|
| EP1395096A2 true EP1395096A2 (de) | 2004-03-03 |
| EP1395096A3 EP1395096A3 (de) | 2005-09-07 |
| EP1395096B1 EP1395096B1 (de) | 2011-04-20 |
Family
ID=31197599
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP03017859A Expired - Lifetime EP1395096B1 (de) | 2002-08-30 | 2003-08-05 | Verfahren zum Betreiben von Leuchtstofflampen und Vorschaltgerät |
Country Status (6)
| Country | Link |
|---|---|
| US (1) | US6933682B2 (de) |
| EP (1) | EP1395096B1 (de) |
| AT (1) | ATE506837T1 (de) |
| CA (1) | CA2437995A1 (de) |
| DE (2) | DE10240807A1 (de) |
| TW (1) | TWI273863B (de) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2011070470A1 (en) | 2009-12-08 | 2011-06-16 | Koninklijke Philips Electronics N.V. | Method and device for driving a fluorescent lamp |
Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20050062852A (ko) * | 2003-12-19 | 2005-06-28 | 삼성전자주식회사 | 액정 표시 장치, 표시 장치용 광원의 구동 장치 및 그방법 |
| DE102005008483A1 (de) * | 2005-02-24 | 2006-08-31 | Patent-Treuhand-Gesellschaft für elektrische Glühlampen mbH | EVG für Hochdruckentladungslampe mit Strommesseinrichtung |
| DE102005018764A1 (de) * | 2005-04-22 | 2006-10-26 | Tridonicatco Gmbh & Co. Kg | Einstellbare digitale Leuchtmittelleistungsregelung |
| EP2067385A1 (de) * | 2006-09-25 | 2009-06-10 | Osram Gesellschaft mit beschränkter Haftung | Schaltungsanordnung und verfahren zum zünden einer entladungslampe |
| US7489531B2 (en) * | 2006-09-28 | 2009-02-10 | Osram Sylvania, Inc. | Inverter with improved overcurrent protection circuit, and power supply and electronic ballast therefor |
| US8049430B2 (en) | 2008-09-05 | 2011-11-01 | Lutron Electronics Co., Inc. | Electronic ballast having a partially self-oscillating inverter circuit |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0287360A2 (de) | 1987-04-13 | 1988-10-19 | Sharp Kabushiki Kaisha | Ansteuerungsvorrichtung für einen Halbleiterlaser |
| US4894587A (en) | 1984-08-17 | 1990-01-16 | Lutron Electronics Co., Inc. | High frequency gas discharge lamp dimming ballast |
| EP0422255B1 (de) | 1989-10-09 | 1994-03-02 | Siemens Aktiengesellschaft | Elektronisches Vorschaltgerät |
Family Cites Families (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4463287A (en) * | 1981-10-07 | 1984-07-31 | Cornell-Dubilier Corp. | Four lamp modular lighting control |
| DE69015418T2 (de) * | 1989-04-25 | 1995-05-04 | Matsushita Electric Works Ltd | Energieversorgung. |
| US5118997A (en) * | 1991-08-16 | 1992-06-02 | General Electric Company | Dual feedback control for a high-efficiency class-d power amplifier circuit |
| EP0677982B1 (de) * | 1994-04-15 | 2000-02-09 | Knobel Ag Lichttechnische Komponenten | Verfahren zum Betrieb eines Vorschaltgeräts für Entladungslampen |
| KR0157093B1 (ko) * | 1994-12-22 | 1998-12-15 | 김광호 | 궤환 디밍 제어회로 |
| US5798620A (en) * | 1996-12-17 | 1998-08-25 | Philips Electronics North America Corporation | Fluorescent lamp dimming |
| US6040661A (en) * | 1998-02-27 | 2000-03-21 | Lumion Corporation | Programmable universal lighting system |
| JP3600976B2 (ja) * | 1998-07-14 | 2004-12-15 | 三菱電機株式会社 | 放電灯点灯装置 |
| TW520618B (en) * | 1999-10-21 | 2003-02-11 | Matsushita Electric Industrial Co Ltd | Fluorescent lamp operating apparatus and compact self-ballasted fluorescent lamp |
| JP2002043087A (ja) * | 2000-07-26 | 2002-02-08 | Toshiba Lighting & Technology Corp | 放電灯点灯装置及び照明装置 |
| US6414449B1 (en) * | 2000-11-22 | 2002-07-02 | City University Of Hong Kong | Universal electronic ballast |
-
2002
- 2002-08-30 DE DE10240807A patent/DE10240807A1/de not_active Withdrawn
-
2003
- 2003-07-29 TW TW092120642A patent/TWI273863B/zh not_active IP Right Cessation
- 2003-08-05 AT AT03017859T patent/ATE506837T1/de active
- 2003-08-05 DE DE50313622T patent/DE50313622D1/de not_active Expired - Lifetime
- 2003-08-05 EP EP03017859A patent/EP1395096B1/de not_active Expired - Lifetime
- 2003-08-20 US US10/643,952 patent/US6933682B2/en not_active Expired - Lifetime
- 2003-08-25 CA CA002437995A patent/CA2437995A1/en not_active Abandoned
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4894587A (en) | 1984-08-17 | 1990-01-16 | Lutron Electronics Co., Inc. | High frequency gas discharge lamp dimming ballast |
| EP0287360A2 (de) | 1987-04-13 | 1988-10-19 | Sharp Kabushiki Kaisha | Ansteuerungsvorrichtung für einen Halbleiterlaser |
| EP0422255B1 (de) | 1989-10-09 | 1994-03-02 | Siemens Aktiengesellschaft | Elektronisches Vorschaltgerät |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2011070470A1 (en) | 2009-12-08 | 2011-06-16 | Koninklijke Philips Electronics N.V. | Method and device for driving a fluorescent lamp |
| CN102640572A (zh) * | 2009-12-08 | 2012-08-15 | 皇家飞利浦电子股份有限公司 | 用于驱动荧光灯的方法和设备 |
| US8664894B2 (en) | 2009-12-08 | 2014-03-04 | Koninklijke Philips N.V. | Method and device for driving a fluorescent lamp |
Also Published As
| Publication number | Publication date |
|---|---|
| EP1395096A3 (de) | 2005-09-07 |
| DE10240807A1 (de) | 2004-03-11 |
| CA2437995A1 (en) | 2004-03-30 |
| US6933682B2 (en) | 2005-08-23 |
| TW200407055A (en) | 2004-05-01 |
| ATE506837T1 (de) | 2011-05-15 |
| EP1395096B1 (de) | 2011-04-20 |
| TWI273863B (en) | 2007-02-11 |
| US20040051481A1 (en) | 2004-03-18 |
| DE50313622D1 (de) | 2011-06-01 |
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