WO1998039950A1 - Verfahren und vorrichtung zum regeln des betriebsverhaltens von gasentladungslampen - Google Patents
Verfahren und vorrichtung zum regeln des betriebsverhaltens von gasentladungslampen Download PDFInfo
- Publication number
- WO1998039950A1 WO1998039950A1 PCT/EP1998/000773 EP9800773W WO9839950A1 WO 1998039950 A1 WO1998039950 A1 WO 1998039950A1 EP 9800773 W EP9800773 W EP 9800773W WO 9839950 A1 WO9839950 A1 WO 9839950A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- controller
- gas discharge
- target
- discharge lamp
- value
- Prior art date
Links
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
-
- 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
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10S315/00—Electric lamp and discharge devices: systems
- Y10S315/04—Dimming circuit for fluorescent lamps
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10S315/00—Electric lamp and discharge devices: systems
- Y10S315/07—Starting and control circuits for gas discharge lamp using transistors
Definitions
- the present invention relates to a method for regulating the operating behavior of gas discharge lamps according to the preamble of claim 1 and a device for operating gas discharge lamps, in particular an electronic ballast, according to the preamble of claim 5.
- Fig. 4 shows a known device according to the preamble of claim 5 for operating gas discharge lamps.
- This referred to as electronic ballast device comprises firstly a rectifier arrangement 4, a Ne t z crispnaps converts into a rectified DC voltage which is fed to an inverter. 5
- the inverter 5 generally has two switches connected in series between a positive supply voltage and ground, which are controlled alternately.
- the connection point between the two alternately controlled switches, which are usually formed by MOS field-effect transistors, is connected to a load circuit which essentially contains a series resonance circuit with a coil 6 and a capacitor 7 and at least one gas discharge lamp 10.
- the gas discharge lamp 10 is connected to the series resonance circuit via a coupling capacitor 8.
- the rectified intermediate circuit voltage supplied by the rectifier 4 is converted into a high-frequency, clocked alternating voltage which is output by the inverter 5 to the series resonant circuit.
- the gas discharge lamp 10 is ignited by shifting the frequency of the AC voltage supplied by the inverter 5 into the vicinity of the resonance frequency of the series resonance circuit with the coil 6 and the capacitor 7. In this case, a voltage surge occurs in the voltage applied to the capacitor 7, which leads to the ignition of the gas discharge lamp 10.
- a heating transformer 9A-C is also present in FIG.
- the heating transformer 9A-C serves to preheat the lamp filaments of the gas discharge lamp 10, the heating voltage having a frequency which is clearly below or above the resonance frequency. In this way it is avoided that the gas discharge lamp 10 ignites with cold lamp filaments, whereby the life of the gas discharge lamp 10 can be extended.
- a heating capacitor can also be connected in parallel to the gas discharge lamp 10.
- the use of a heating transformer with secondary windings 9B or 9C connected to the lamp filaments of the gas discharge lamp 10 has the advantage that energy can still be supplied to the lamp filaments even after the gas discharge lamp 10 has been ignited.
- the series resonance circuit with the coil 6 and the capacitor 7 and the gas discharge lamp 10 are part of a control system 2, which in turn is part of a control circuit, the behavior of which is determined by a controller 1.
- the device shown in FIG. 4 serves to regulate the brightness of the gas discharge lamp 10 as a function of an externally predetermined dimming setpoint SOLL, which is compared in an comparator 3 designed as an adder with an actual dimming value ACTUAL, the resulting difference signal DIFF is fed to the controller 1, which generates a control signal STELL for a specific controlled variable of the controlled system 2 as a function of the control difference DIFF.
- the manipulated variable signal can relate to the frequency and / or the pulse duty factor of the clocked alternating voltage supplied by the inverter 5.
- a resistor 12 is provided to determine the actual brightness value of the gas discharge lamp 10, which resistor is connected in series with the lower lamp filament of the gas discharge lamp 10.
- the voltage drop across the resistor 12 is a direct measure of the lamp current flowing across the gas discharge path of the gas discharge lamp 10, which in turn is directly related to the degree of dimming or the brightness of the gas discharge lamp 10.
- the actual value of the degree of dimming of the gas discharge lamp 10 can be detected by ascertaining the voltage drop across the resistor 12.
- the basic structure of the ballast shown in FIG. 4 is already known, for example, from DE 40 18 127 AI. It proposes to record the actual value of an operating variable of the electronic ballast, to form the difference value between the detected actual value and a predetermined target value and to supply this difference value to a controller which, depending on the difference value, has a manipulated value, for example for the AC voltage of the inverter applied to the series resonance circuit generated in order to regulate the lamp brightness of the gas discharge lamp controlled via the series resonance circuit. Because of the series resonance circuit with the coil 6 and the capacitor 7 present in the controlled system 2 shown in FIG. 4, the controlled system 2 essentially exhibits a PT 2 behavior, ie the controlled system 2 acts as a second-order delay element.
- a PID controller is advantageously used, ie a controller that has both proportional amplifying and integrating and differentiating properties.
- a PI controller is generally used as controller 1 for the controlled system 2 shown in FIG. 4.
- a regulator 1 is selected with a low brightness of the gas discharge lamp 10, i.e. with a high degree of dimming, the proportion of which is so high that the gas discharge lamp 10 can be ignited even at low brightness values without flashing light.
- a high proportion i.e. Gain of the regulator 1
- a method for regulating the operating behavior of gas discharge lamps is already known from DE 43 31 952 AI, wherein a parameter of the regulator device used is set as a function of a predetermined setpoint.
- a controller device consisting of two blocks is used, one block forming the actual controller and the second block following the first block forming a limiter which limits the output signal of the controller to a maximum value.
- the actual value of the lamp output of the gas discharge lamp is recorded and fed to the controller, which also receives a predetermined setpoint and, depending on the difference between the actual value and the setpoint, generates a manipulated value for the duty cycle of a switching regulator of the electronic ballast.
- This manipulated value is fed to the limiter, which limits the manipulated value with respect to an adjustable maximum value, the maximum value of the limiter being set as a function of the specified target value. In particular, the maximum value of the limiter is reduced when the setpoint is low.
- the present invention has for its object to provide a method and an apparatus for regulating the operating behavior of gas discharge lamps using a regulator with a proportional component, the regulation being better adaptable to the needs.
- the gas discharge lamps should also have a high degree of dimming, i.e. low lamp brightness, can be reliably ignited without lower dimming levels, i.e. larger lamp powers, instabilities occur.
- the setpoint specified for the control circuit for example the dimming setpoint
- the proportional component i.e. the gain factor of the controller is set and adjusted. So for starting gas discharge lamps at low brightness values, i.e. high degrees of dimming, a high proportion, i.e. a high amplification factor is necessary in order to be able to ignite the gas discharge lamp without flashing light. With increasing brightness of the gas discharge lamp, i.e.
- the proportional portion of the controller is reduced and in extreme cases even set to zero, in which case the controller works as a pure I controller.
- the proportional component of the controller in critical dimming ranges in which a low proportional component, ie a low amplification factor, could lead to instability of the control loop, the proportional component of the controller can be increased in a targeted manner.
- the aim is to select and set the ideal proportional portion for each individual load case, which can be detected and specified in addition to a predetermined dimming setpoint and also by changing operating state parameters of the control loop.
- the method and electronic ballast according to the invention are used in particular wherever lighting with low brightness, i.e. high degrees of dimming is desired, such as in movie theaters or the like, since, according to the invention, it is reliably possible to ignite gas discharge lamps even at a low level of brightness without flashing light.
- Fig. 3 shows a second embodiment of the electronic ballast according to the invention.
- FIG. 4 shows a known electronic ballast with a PI controller for regulating the operating behavior of a gas discharge lamp present in a controlled system.
- 1 shows a first exemplary embodiment of the electronic ballast according to the invention for operating gas discharge lamps.
- the electronic ballast shown in FIG. 1 has - as already explained with reference to FIG. 4 - a control circuit which contains a controller 1, a controlled system 2 and a comparator 3.
- the components corresponding to the components shown in FIG. 4 are provided with identical reference numerals, and a repeated description of these components is omitted.
- the embodiment of the electronic ballast according to the invention shown in FIG. 1 differs from the known electronic ballast shown in FIG. 4 mainly in the design of the regulator 1.
- the regulator 1 used in the electronic ballast according to the invention is also designed as a PI controller, which thus has a proportionally amplifying as well as integrating behavior.
- the PI controller 1 can advantageously be supplemented by a differentiating element, so that the PI controller becomes a PID controller which, although more complex, is more suitable for controlling the behavior of the controlled system which has a PT 2 behavior is.
- the externally specified Dirnm setpoint can come from an external dimmer or, for example, also from a light sensor that monitors a specific workstation illuminated by the lamp 10.
- the PI controller 1 has an adjusting device 16, which could optionally also be arranged outside the PI controller 1.
- This setting device 16 is supplied with the externally predetermined nominal value desired.
- the setting device 16 adjusts the proportional component of the PI element 14 of the PI controller 1 as a function of the Dirnm setpoint SOLL.
- the target dimming value TARGET is compared in a comparator 3 with the actual dimming value ACTUAL, the resulting difference value DIFF in addition to the P element 14 and also an I element 13 of the PI controller 1 is supplied.
- the P control element 14 and the I control element 13 each generate a corresponding control value depending on the difference value supplied, the control values thus generated being added on the output side by an adder 15 and being output as the control signal STELL of the PI controller 1.
- the detection of the actual value of the lamp brightness 10, i.e. the degree of dimming, in particular - as already explained with reference to FIG. 4 - by determining the voltage drop across a resistor 12, which is connected in series with the lower lamp filament of the gas discharge lamp 10 to ground.
- the voltage drop across this resistor 12 is a measure of the lamp current flowing over the gas discharge path of the gas discharge lamp 10, which increases with increasing lamp brightness.
- the setting of the P component within the PI controller 1 with the aid of the setting device 16 takes place as a function of the predetermined Dirnm setpoint SHOULD, as shown in FIG.
- the proportional portion within the PI controller for such low brightness values must be chosen large according to the invention.
- this high proportional component or gain factor were to be maintained even with large brightness values, ie low dimming levels, the high loop current or high lamp power flowing in the controlled system 2 in this case could lead to instabilities in the control loop.
- the proportional component ie the gain factor of the PI controller 1
- the proportional component of the PI controller 1 can be set linearly as a function of the predetermined Dirnm setpoint SHOULD.
- the setting device 16 adjusts the proportional portion of the proportional control element 14 in accordance with the characteristic curve shown in FIGS. 2a and 2b, depending on the dimming setpoint SHOULD applied to it. In this way it is possible according to the invention to select and set the ideal proportional portion or gain factor for each load case, ie for each dimming value.
- 2c shows the characteristics of the lamp resistance R L of the lamp current I L corresponding to the characteristics of FIGS. 2a and 2b, depending on the lamp brightness of the gas discharge lamp 10 or the predetermined dirnm setpoint SHOULD.
- 2c and 2d in particular show that with increasing lamp brightness, the lamp current rises over the gas discharge path of the gas discharge lamp 10 and, accordingly, the resistance of the gas discharge lamp also drops with the desired lamp brightness.
- Fig. 3 shows a second embodiment of the electronic ballast according to the invention.
- the PI controller 1 is divided into two control units 17 and 18.
- the first control unit 18 is controlled purely by software and is in particular in the form of a programmable or programmed microprocessor.
- the second control unit 17 is constructed purely in terms of hardware by combining known standard switching rods and is in particular in the form of an application-specific integrated circuit (ASIC).
- ASIC application-specific integrated circuit
- the two control units 17 and 18 are connected to one another by a bidirectional transmission line 19.
- the first control unit 18 receives exclusively externally specified control information, such as, in particular, the externally specifiable dimming setpoint SHOULD.
- the second control unit 17 receives only internal operating state parameters, such as the lamp current i L , which is also a measure of the degree of dimming or the lamp brightness of the gas discharge lamp 10. 3, the second control unit 17 receives the instantaneous value of the heating current i H , which flows through the primary winding 9A of the heating transformer.
- a resistor 11 is connected between the primary winding 9A of the heating transformer and ground, so that the voltage drop across this resistor 11 is a measure of the heating current i H flowing through the primary winding 9A.
- the second control unit 17 can be supplied with further internal operating state parameters, such as, for example, the actual values of the lamp voltage or the DC voltage supplied by the rectifier 4.
- the operation of the split PI controller 1 shown in Fig. 3 is as follows.
- the second control unit 17 receives and stores the actual values of the operating state parameters applied to it.
- the first control unit 18 then reads from the Corresponding memory of the second control unit 17 determines the corresponding actual values of the aforementioned internal operating state parameters and, depending on the actual values of the internal operating state parameters transmitted via the connection line 19 and the external control information present at the first control unit 18, in particular the dimming setpoint SHOULD, determines corresponding control value information .
- the first control unit 18 thus realizes the actual function of the PI controller 1.
- the functions of the setting device 16 of the P element 14, of the I element 13 and of the adder 15 are implemented in the first control unit 18.
- the P component within the PI controller function is thus set as a function of the dimming setpoint SHOULD applied to it.
- the first regulating unit 18 transmits this manipulated variable information via the bidirectional connecting line 19 to the second regulating unit 17, which in turn generates the actual manipulated variable signal on the basis of this manipulated variable information and the change in the corresponding controlled variable, for example the frequency or the duty cycle from the inverter 5 supplied AC voltage.
- the division of the PI controller 1 shown in FIG. 3 into a purely software-controlled control unit 18 and a purely hardware-based control unit 17 makes it possible, on the one hand, to ensure sufficient flexibility to adapt to possible switching changes due to the software implementation of the first control unit 18 and on the other hand, with the aid of the second control unit 17 constructed in terms of hardware, a sufficiently high speed is ensured on account of its hardware structure.
- the first control unit 18 is therefore responsible for the slow control processes and the second control unit 17 for the fast control processes. If the PI controller 1 as a whole were constructed purely in terms of hardware, there would not be sufficient flexibility for changes in the circuitry.
- the processing speed of the PI controller 1 would not be fast enough in the case of a purely software configuration for fast regulating or control processes.
- the solution shown in FIG. 3 thus provides the best possible compromise between sufficient flexibility on the one hand and a sufficiently high processing speed on the other hand.
Landscapes
- Discharge-Lamp Control Circuits And Pulse- Feed Circuits (AREA)
- Circuit Arrangements For Discharge Lamps (AREA)
- Lighting Device Outwards From Vehicle And Optical Signal (AREA)
Abstract
Description
Claims
Priority Applications (6)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
AT98909447T ATE200951T1 (de) | 1997-03-04 | 1998-02-11 | Verfahren und vorrichtung zum regeln des betriebsverhaltens von gasentladungslampen |
EP98909447A EP0965251B1 (de) | 1997-03-04 | 1998-02-11 | Verfahren und vorrichtung zum regeln des betriebsverhaltens von gasentladungslampen |
DE59800670T DE59800670D1 (de) | 1997-03-04 | 1998-02-11 | Verfahren und vorrichtung zum regeln des betriebsverhaltens von gasentladungslampen |
BRPI9808168-3A BR9808168B1 (pt) | 1997-03-04 | 1998-02-11 | método para controlar o desempenho operacional de lámpadas de descarga de gás e lastro eletrÈnico para operar pelo menos uma lámpada de descarga de gás. |
AU63977/98A AU721846B2 (en) | 1997-03-04 | 1998-02-11 | Method and device for controlling the operational performance of gas discharge lamps |
US09/387,847 US6316886B1 (en) | 1997-03-04 | 1999-09-01 | Method and device for controlling the operational performance of gas discharge lamps |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE19708783A DE19708783C1 (de) | 1997-03-04 | 1997-03-04 | Verfahren und Vorrichtung zum Regeln des Betriebsverhaltens von Gasentladungslampen |
DE19708783.3 | 1997-03-04 |
Related Child Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US09/387,847 Continuation US6316886B1 (en) | 1997-03-04 | 1999-09-01 | Method and device for controlling the operational performance of gas discharge lamps |
Publications (1)
Publication Number | Publication Date |
---|---|
WO1998039950A1 true WO1998039950A1 (de) | 1998-09-11 |
Family
ID=7822202
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/EP1998/000773 WO1998039950A1 (de) | 1997-03-04 | 1998-02-11 | Verfahren und vorrichtung zum regeln des betriebsverhaltens von gasentladungslampen |
Country Status (7)
Country | Link |
---|---|
US (1) | US6316886B1 (de) |
EP (1) | EP0965251B1 (de) |
AT (1) | ATE200951T1 (de) |
AU (1) | AU721846B2 (de) |
BR (1) | BR9808168B1 (de) |
DE (2) | DE19708783C1 (de) |
WO (1) | WO1998039950A1 (de) |
Cited By (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2002037904A1 (en) * | 2000-11-02 | 2002-05-10 | Koninklijke Philips Electronics N.V. | Digital ballast |
WO2002058439A1 (en) * | 2001-01-22 | 2002-07-25 | Koninklijke Philips Electronics N.V. | Ballast and method of feeding a fluorescent lamp |
WO2007104666A1 (de) * | 2006-03-15 | 2007-09-20 | Patent-Treuhand-Gesellschaft für elektrische Glühlampen mbH | Geregeltes vorschaltgerät für eine lampe |
WO2008029344A1 (en) * | 2006-09-07 | 2008-03-13 | Koninklijke Philips Electronics N.V. | Lamp driver circuit and method for driving a discharge lamp |
AT13981U1 (de) * | 2013-04-30 | 2015-02-15 | Tridonic Gmbh & Co Kg | Betriebsschaltung für Leuchtdioden |
AT14316U1 (de) * | 2014-02-17 | 2015-08-15 | Tridonic Gmbh & Co Kg | Treiberschaltung für LEDs |
Families Citing this family (13)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE10319950A1 (de) * | 2003-05-02 | 2004-11-18 | Patent-Treuhand-Gesellschaft für elektrische Glühlampen mbH | Betriebsgerät und Verfahren zum Betreiben von Gasentladungslampen |
US7154229B2 (en) * | 2004-11-04 | 2006-12-26 | Osram Sylvania, Inc. | Electronic ballast with load shed circuit |
KR101119782B1 (ko) * | 2004-12-31 | 2012-03-23 | 엘지디스플레이 주식회사 | 휘도의 균일도가 향상된 백라이트 |
DE102005018775A1 (de) * | 2005-04-22 | 2006-10-26 | Tridonicatco Gmbh & Co. Kg | Parametrisierbarer digitaler PFC |
DE102005018774A1 (de) * | 2005-04-22 | 2006-10-26 | Tridonicatco Gmbh & Co. Kg | Einstellbare digitale Leuchtmittelleistungsregelung |
DE102005018764A1 (de) * | 2005-04-22 | 2006-10-26 | Tridonicatco Gmbh & Co. Kg | Einstellbare digitale Leuchtmittelleistungsregelung |
US7274178B2 (en) * | 2005-11-04 | 2007-09-25 | Au Optronics Corporation | Multi-lamp driver with active current regulator |
RU2453078C2 (ru) * | 2006-12-11 | 2012-06-10 | Конинклейке Филипс Электроникс Н.В. | Способ и устройство для цифрового управления устройством освещения |
EP2103192B1 (de) * | 2007-01-17 | 2013-03-13 | OSRAM GmbH | Schaltungsanordnung und verfahren für die zündung und den betrieb einer oder mehrerer entladungslampen |
DE102009019625B4 (de) * | 2009-04-30 | 2014-05-15 | Osram Gmbh | Verfahren zum Ermitteln eines Typs einer Gasentladungslampe und elektronisches Vorschaltgerät zum Betreiben von mindestens zwei unterschiedlichen Typen von Gasentladungslampen |
US8217583B2 (en) * | 2010-07-21 | 2012-07-10 | Grenergy Opto, Inc. | Gas-discharge lamp controller utilizing a novel reheating frequency generation mechanism |
DE102010039430A1 (de) * | 2010-08-18 | 2012-02-23 | Osram Ag | Elektronisches Vorschaltgerät und Verfahren zum Betreiben mindestens einer Entladungslampe |
DE102012216047A1 (de) | 2012-09-11 | 2014-03-13 | Tridonic Gmbh & Co. Kg | Einstellung einer Leistungsfaktorkorrektur für Lastkreis mit Leuchtmitteln |
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EP0605052A1 (de) * | 1992-12-28 | 1994-07-06 | Koninklijke Philips Electronics N.V. | Vorschaltgerät für eine Entladungslampe |
DE4412510A1 (de) * | 1993-04-12 | 1994-10-13 | Mitsubishi Electric Corp | Entladungslampen-Erleuchtungsvorrichtung, welche in der Lage ist, ein Flackern aufgrund einer Lichtbogen-Bewegung zu verhindern |
EP0774885A1 (de) * | 1995-11-07 | 1997-05-21 | Koninklijke Philips Electronics N.V. | Schaltungsanordnung |
EP0796036A2 (de) * | 1996-03-14 | 1997-09-17 | Mitsubishi Denki Kabushiki Kaisha | Zündgerät für eine Entladungslampe |
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US4698554A (en) * | 1983-01-03 | 1987-10-06 | North American Philips Corporation | Variable frequency current control device for discharge lamps |
NL8800288A (nl) * | 1988-02-08 | 1989-09-01 | Nedap Nv | Voorschakelapparaat voor een fluorescentielamp. |
US4958108A (en) * | 1989-02-14 | 1990-09-18 | Avtech Corporation | Universal fluorescent lamp ballast |
DE58907133D1 (de) * | 1989-10-09 | 1994-04-07 | Siemens Ag | Elektronisches Vorschaltgerät. |
DE4018127A1 (de) * | 1990-06-06 | 1991-12-12 | Zumtobel Ag | Verfahren und schaltungsanordnung zur regelung der helligkeit (dimmen) von gasentladungslampen |
US5107184A (en) * | 1990-08-13 | 1992-04-21 | Electronic Ballast Technology, Inc. | Remote control of fluorescent lamp ballast using power flow interruption coding with means to maintain filament voltage substantially constant as the lamp voltage decreases |
DE4331952A1 (de) * | 1993-09-21 | 1995-03-23 | Hella Kg Hueck & Co | Einrichtung zum Starten und Betreiben einer Gasentladungslampe in Kraftfahrzeugen |
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US5600211A (en) * | 1994-09-16 | 1997-02-04 | Tridonic Bauelemente Gmbh | Electronic ballast for gas discharge lamps |
US6060843A (en) * | 1996-01-26 | 2000-05-09 | Tridonic Bauelemente Gmbh | Method and control circuit for regulation of the operational characteristics of gas discharge lamps |
US5900701A (en) * | 1996-05-21 | 1999-05-04 | Allied Energy Services International, Inc. | High frequency electronic ballast for lighting |
US6051940A (en) * | 1998-04-30 | 2000-04-18 | Magnetek, Inc. | Safety control circuit for detecting the removal of lamps from a ballast and reducing the through-lamp leakage currents |
-
1997
- 1997-03-04 DE DE19708783A patent/DE19708783C1/de not_active Expired - Fee Related
-
1998
- 1998-02-11 BR BRPI9808168-3A patent/BR9808168B1/pt not_active IP Right Cessation
- 1998-02-11 AT AT98909447T patent/ATE200951T1/de not_active IP Right Cessation
- 1998-02-11 WO PCT/EP1998/000773 patent/WO1998039950A1/de active IP Right Grant
- 1998-02-11 EP EP98909447A patent/EP0965251B1/de not_active Expired - Lifetime
- 1998-02-11 AU AU63977/98A patent/AU721846B2/en not_active Ceased
- 1998-02-11 DE DE59800670T patent/DE59800670D1/de not_active Expired - Lifetime
-
1999
- 1999-09-01 US US09/387,847 patent/US6316886B1/en not_active Expired - Lifetime
Patent Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0605052A1 (de) * | 1992-12-28 | 1994-07-06 | Koninklijke Philips Electronics N.V. | Vorschaltgerät für eine Entladungslampe |
DE4412510A1 (de) * | 1993-04-12 | 1994-10-13 | Mitsubishi Electric Corp | Entladungslampen-Erleuchtungsvorrichtung, welche in der Lage ist, ein Flackern aufgrund einer Lichtbogen-Bewegung zu verhindern |
EP0774885A1 (de) * | 1995-11-07 | 1997-05-21 | Koninklijke Philips Electronics N.V. | Schaltungsanordnung |
EP0796036A2 (de) * | 1996-03-14 | 1997-09-17 | Mitsubishi Denki Kabushiki Kaisha | Zündgerät für eine Entladungslampe |
Cited By (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2002037904A1 (en) * | 2000-11-02 | 2002-05-10 | Koninklijke Philips Electronics N.V. | Digital ballast |
WO2002058439A1 (en) * | 2001-01-22 | 2002-07-25 | Koninklijke Philips Electronics N.V. | Ballast and method of feeding a fluorescent lamp |
WO2007104666A1 (de) * | 2006-03-15 | 2007-09-20 | Patent-Treuhand-Gesellschaft für elektrische Glühlampen mbH | Geregeltes vorschaltgerät für eine lampe |
WO2008029344A1 (en) * | 2006-09-07 | 2008-03-13 | Koninklijke Philips Electronics N.V. | Lamp driver circuit and method for driving a discharge lamp |
US7990076B2 (en) | 2006-09-07 | 2011-08-02 | Koninklijke Philips Electronics N.V. | Lamp driver circuit and method for driving a discharge lamp |
AT13981U1 (de) * | 2013-04-30 | 2015-02-15 | Tridonic Gmbh & Co Kg | Betriebsschaltung für Leuchtdioden |
AT14316U1 (de) * | 2014-02-17 | 2015-08-15 | Tridonic Gmbh & Co Kg | Treiberschaltung für LEDs |
Also Published As
Publication number | Publication date |
---|---|
BR9808168B1 (pt) | 2011-05-31 |
DE59800670D1 (de) | 2001-06-07 |
BR9808168A (pt) | 2000-05-16 |
EP0965251B1 (de) | 2001-05-02 |
AU721846B2 (en) | 2000-07-13 |
AU6397798A (en) | 1998-09-22 |
US6316886B1 (en) | 2001-11-13 |
ATE200951T1 (de) | 2001-05-15 |
DE19708783C1 (de) | 1998-10-08 |
EP0965251A1 (de) | 1999-12-22 |
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