EP2271187B1 - Steuerung und Messung der Funktionen eines elektronischen Vorschaltgerät - Google Patents

Steuerung und Messung der Funktionen eines elektronischen Vorschaltgerät Download PDF

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Publication number
EP2271187B1
EP2271187B1 EP10163702.3A EP10163702A EP2271187B1 EP 2271187 B1 EP2271187 B1 EP 2271187B1 EP 10163702 A EP10163702 A EP 10163702A EP 2271187 B1 EP2271187 B1 EP 2271187B1
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EP
European Patent Office
Prior art keywords
current
switching transistor
electronic ballast
switching
lamp
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Active
Application number
EP10163702.3A
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English (en)
French (fr)
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EP2271187A2 (de
EP2271187A3 (de
Inventor
Hannu Vihinen
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Helvar Oy AB
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Helvar Oy AB
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Publication of EP2271187A3 publication Critical patent/EP2271187A3/de
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Classifications

    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B41/00—Circuit arrangements or apparatus for igniting or operating discharge lamps
    • H05B41/14—Circuit arrangements
    • H05B41/26—Circuit arrangements in which the lamp is fed by power derived from dc by means of a converter, e.g. by high-voltage dc
    • H05B41/28—Circuit arrangements in which the lamp is fed by power derived from dc by means of a converter, e.g. by high-voltage dc using static converters
    • H05B41/282—Circuit arrangements in which the lamp is fed by power derived from dc by means of a converter, e.g. by high-voltage dc using static converters with semiconductor devices
    • H05B41/285—Arrangements for protecting lamps or circuits against abnormal operating conditions
    • H05B41/2851—Arrangements for protecting lamps or circuits against abnormal operating conditions for protecting the circuit against abnormal operating conditions
    • 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
    • H05B41/2981—Arrangements for protecting lamps or circuits against abnormal operating conditions for protecting the circuit against abnormal operating conditions
    • H05B41/2986—Arrangements for protecting lamps or circuits against abnormal operating conditions for protecting the circuit against abnormal operating conditions against internal abnormal circuit conditions
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B41/00—Circuit arrangements or apparatus for igniting or operating discharge lamps
    • H05B41/14—Circuit arrangements
    • H05B41/26—Circuit arrangements in which the lamp is fed by power derived from dc by means of a converter, e.g. by high-voltage dc
    • H05B41/28—Circuit arrangements in which the lamp is fed by power derived from dc by means of a converter, e.g. by high-voltage dc using static converters
    • H05B41/282—Circuit arrangements in which the lamp is fed by power derived from dc by means of a converter, e.g. by high-voltage dc using static converters with semiconductor devices
    • H05B41/2825—Circuit arrangements in which the lamp is fed by power derived from dc by means of a converter, e.g. by high-voltage dc using static converters with semiconductor devices by means of a bridge converter in the final stage
    • 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
    • H05B41/292—Arrangements for protecting lamps or circuits against abnormal operating conditions
    • H05B41/2921—Arrangements for protecting lamps or circuits against abnormal operating conditions for protecting the circuit against abnormal operating conditions
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B41/00—Circuit arrangements or apparatus for igniting or operating discharge lamps
    • H05B41/14—Circuit arrangements
    • H05B41/26—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
    • H05B41/2981—Arrangements for protecting lamps or circuits against abnormal operating conditions for protecting the circuit against abnormal operating conditions

Definitions

  • Tubular fluorescent lamps and HID lamps High Intensity Discharge are connected by way of electronic ballasts with a supply of electric power, receiving therefrom the energy needed thereby for illumination while being switched to the ON state.
  • the fluorescent tube of fluorescent lamps and HID lamps is filled with a gas, such as for example argon or krypton.
  • a gas such as for example argon or krypton.
  • the generation of light further requires "a drop” of mercury which gasifies in response to an electrical discharge, producing ultraviolet radiation as electricity discharges through the fluorescent lamp tube.
  • the fluorescent lamp tube has its inner surface coated with a fluorescent material, converting the ultraviolet radiation, which has been generated by the electrical discharge taking place in mercury vapor, into visible light.
  • the fluorescent lamp and the HID lamp comprise either an electronic ballast or a magnetic inductor.
  • magnetic inductors have been almost completely displaced by electronic ballasts.
  • the current generated in electronic ballasts and flowing through a fluorescent lamp tube is generally 20-100 kHz in frequency, most typically 50-60 kHz.
  • Measuring the current of a switching transistor set against earth potential represents prior known technology on the basis of several examples. In fact, this particular method has been and is currently used in a multitude of electronic ballasts available in the marketplace.
  • Publication WO2005/083872A1 comprises measuring the current of a first switching transistor set against earth potential, as well as the voltage of a midpoint between two switching transistors. However, no information can be obtained from this particular voltage about the current of a second switching transistor which is not set against earth potential. Accordingly, the signal produced in the process of measuring the voltage of said midpoint cannot be used as a signal on the basis of which said second switching transistor would be switched off in the event that its current exceeds a predetermined limit value.
  • Fig 3 of document EP 2 046 099 included as Fig 1 in the present application, shows an electronic ballast 102 connectable to a fluorescent tube 100.
  • the electronic ballast 102 has a control circuit 104 integrated therein so as to enable a measurement for providing separate measuring signals representing the currents of both an upper switching transistor Q1 and a lower switching transistor Q2.
  • the embodiment shown in Fig 3 of document EP 2 046 099 features a diode couple Q3a and Q3b, which enables a measurement of the current for an ignition capacitor C1 and measurements of the currents for the switching transistors Q1 and Q2 with one resistor R3.
  • Drawbacks in this embodiment include slowness in the establishment of measuring signals and thereby also in the status transitions of switching transistors based on said measuring signals, and instability in the magnitude of an ignition voltage established for the lamp.
  • Another drawback in this embodiment is that, especially with large manufacturing volumes in mass production, the cost of diodes becomes high.
  • An objective of the invention is to provide an electronic ballast assembly, which enables establishing a lamp ignition voltage in a rapid and controlled fashion.
  • a lamp according to the invention for producing illuminating radiation comprising an electronic ballast for establishing an ignition voltage for the lamp in order to initiate the production of illuminating radiation, said electronic ballast comprising at least two switching transistors Q1, Q2 for supplying current to at least one coil, which develops the lamp ignition voltage, and said electronic ballast having a control circuit integrated therewith.
  • the electronic ballast comprises at least two resistors R8, R10 set in a series connection at least relative to each other for measuring and/or regulating the currents of said at least two switching transistors Q1, Q2, said resistor R8 being in connection with the switching transistor Q2, and the resistor R10 being in a series connection with the resistorR8 and with a voltage source, and said electronic ballast comprising the series connection of said resistors R8, R10 for operating said control circuit in order to detect whether the current passing through the switching transistor Q1 or Q2 is overly high with respect to a limit current value set for the control circuit, and by operating said control circuit, for immediately switching off the control of that switching transistor Q1 or Q2 which switching transistor Q1 or Q2 has been found to have an overly high passing current and for immediately switching on the current of the other switching transistor Q1 or Q2.
  • the invention is based on having the electronic ballast comprise at least two resistors R8, R10 set in a series connection relative to each other for measuring and/or regulating the currents of at least two switching transistors Q1, Q2 in such a way that the resistor R8 is in connection with the switching transistor Q2 and the resistor R10 is in a series connection with the resistor R8 and with a voltage source.
  • the electronic ballast comprise at least two resistors R8, R10 set in a series connection relative to each other for measuring and/or regulating the currents of at least two switching transistors Q1, Q2 in such a way that the resistor R8 is in connection with the switching transistor Q2 and the resistor R10 is in a series connection with the resistor R8 and with a voltage source.
  • An advantage of the invention is that the establishment of a lamp ignition voltage is expedited in a stable manner.
  • the invention provides economic benefit in terms of the manufacturing costs of ballasts.
  • Fig. 2 shows a lamp of the invention, which enables measuring a peak current for both switching transistors Q1, Q2 and controlling the current pulse by pulse in such a way that, during the establishment of an ignition voltage for the lamp, the current remains essentially constant.
  • the lamp according to the invention makes use of a series connection of the resistors R8 and R10 to establish connections, on the basis of which the prior art use of diodes is replaced by a configuration of improved performance.
  • the lamp according to the invention includes an electronic ballast 102 comprising the resistors R8, R10 set in a series connection relative to each other for measuring and/or regulating the currents of the switching transistors Q1, Q2.
  • the resistor R8 is in connection with the switching transistor Q2 and with a comparator connection 112 included in a control circuit 104.
  • the resistor R10 is in a series connection with the resistor R8 and with a voltage source Vbus.
  • the electronic ballast 102 comprises the series connection of said resistors R8, R10 for operating the control circuit 104 through the intermediary of the comparator connection 112 for detecting whether an overly high current is passing through the switching transistor Q1 or Q2 to the control circuit 104.
  • control circuit 104 is operated for immediately switching off the control of that switching transistor Q1 or Q2 which switching transistor Q1 or Q2 has been found to have an overly high passing current and for immediately switching on the current of the other switching transistor Q1 or Q2.
  • the switching transistor Q1 or Q2 is supplied for example with a current in pulse form.
  • a current path 107 represents the route of current in the process of establishing a lamp ignition voltage preceding the lamp ignition as the switching transistor Q2 is supplied with a current in pulse form.
  • Fig. 3 shows currents during a switched-on state of the switching transistors Q1, Q2 as the ignition voltage is developing in the prior art embodiment of fig. 1 .
  • Fig. 4 shows signals 11 during a switched-on state of the switching transistors Q1, Q2 over a current path 105 while Q1 is on, and I2 over a current path 107 while Q2 is on, in the embodiment of fig. 2 according to the invention as the ignition voltage is developing.
  • a pulse form current Ik in fig. 4 represents the output of a current measuring comparator A1, which rises up when the current of either switching transistor Q1 or Q2 rises over a limit value 120 set for the control circuit 104 and indicated by a dashed line.
  • the regulation setup according to the invention enables controlling the current even upon the saturation of a coil L1.
  • the coil L1 is depicted in a distributed fashion as coils L1a, L1b and L1c.
  • Fig. 4 illustrates said currents I1 and I2 of the switching transistors Q1 and Q2, which are proportional to the voltage of a CS pin marked in figs. 2 and 5 in the size ratio of the resistors R8 and R10.
  • Designated in fig. 4 is also a reference voltage Vcomp. of the current measuring comparator A1. When this reference voltage is crossed, there will be a change in the output state of the current measuring comparator A1.
  • Fig. 5 shows an implementation according to a preferred embodiment of the invention for establishing a pulse-by-pulse current restriction for the switching transistors Q 1 and Q 2 .
  • Fig. 6 shows oscillator signals relevant to the preferred embodiment of the invention shown in fig. 5 .
  • Fig. 7 shows control signals for the switching transistors Q1, Q2 and output signals for a distribution circuit 116, also relevant to fig. 5 .
  • an oscillator comparator A 2 functions as a monitor for the voltage between a capacitor C f and a resistor R f .
  • the comparator A 2 triggers an RS flip-flop 121.
  • the output of the flip-flop 121 rises up and the capacitor C f is charged by a transistor Q 4 back to a circuit operating voltage V cc .
  • the flip-flop output also controls the divider circuit 116, whose complemented outputs operate at a frequency which is half of that of an oscillator circuit 114.
  • the lamp ballast 102 has its circuitry maintained at a frequency level which is higher than it would be if defined solely by the resistor R f and the capacitor C f . This enables reaching a status in which the lamp ignition voltage maintains a constant level, even in the event that the coil L1 (L1A, L1B, L1C) of the lamp circuit becomes saturated.
  • fig. 6 illustrates the signals of the oscillator circuit 114 when operating within a current restriction range of the switching transistors Q1, Q2, preferably set for the control circuit 104. Relating also to fig. 5 , there is shown in fig.
  • the lamp comprises some of its circuit implementations in the form of an IC circuit (Integrated Circuits) and, in combination therewith, the rest of its circuit implementation in the form of at least one different circuit topology.
  • the IC circuit Integrated circuits
  • RC oscillator resistor-capacitor oscillator
  • IC circuits are generally prefabricated entities with other circuitry connected to the inputs and/or outputs thereof. Aspects of the invention can also be carried out with any type of circuit topology, such as for example discrete components, ASIC circuits (Application Specific Integrated Circuits) or IC circuits or various combinations thereof.
  • the lamp can be for example a fluorescent lamp or an HID lamp, i.e. a high intensity discharge lamp.

Landscapes

  • Circuit Arrangements For Discharge Lamps (AREA)

Claims (1)

  1. Elektronisches Vorschaltgerät (102) zum Aufbauen einer Zündspannung für eine Lampe, um die Erzeugung von beleuchtender Strahlung zu initiieren, wobei das elektronische Vorschaltgerät (102) Folgendes umfasst:
    - mindestens zwei Schalttransistoren (Q1, Q2) zum Liefern von Strom an mindestens eine Spule (L1), die ausgelegt ist zum Entwickeln der Zündspannung, und
    - eine damit integrierte Steuerschaltung (104),
    dadurch gekennzeichnet, dass:
    - das elektronische Vorschaltgerät (102) mindestens zwei Widerstände (R8, R10) umfasst, die relativ zueinander in einer Reihenschaltung angeordnet sind, zum Messen und/oder Regeln der Ströme der mindestens zwei Schalttransistoren (Q1, Q2),
    - ein erster der Widerstände (R8) zwischen dem unteren Schalttransistor (Q2) und dem zweiten der Widerstände (R10) liegt, der wiederum zwischen dem ersten Widerstand (R8) und einem Pol einer Spannungsquelle liegt, wobei deren anderer Pol in Verbindung mit dem oberen Schalttransistor ist,
    - die Steuerschaltung (104) ausgelegt ist zum Vergleichen des elektrischen Potentials zwischen dem unteren Schalttransistor (Q2) und dem ersten Widerstand (R8) mit einer Referenz, um zu detektieren, ob ein Strom, der durch einen der Schalttransistoren (Q1, Q2) hindurchgeht, einen Grenzstromwert übersteigt, der für die Steuerschaltung eingestellt ist, und
    - die Steuerschaltung (104) ausgelegt ist zum sofortigen Ausschalten der Steuerung des Schalttransistors (Q1, Q2), der mit einem übermäßigen durchgehenden Strom gefunden wurde, und zum Einschalten des Stroms des anderen Schalttransistors (Q1, Q2).
EP10163702.3A 2009-06-30 2010-05-24 Steuerung und Messung der Funktionen eines elektronischen Vorschaltgerät Active EP2271187B1 (de)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FI20095737A FI121561B (fi) 2009-06-30 2009-06-30 Elektronisen liitäntälaitteen toimintojen säätäminen ja mittaaminen

Publications (3)

Publication Number Publication Date
EP2271187A2 EP2271187A2 (de) 2011-01-05
EP2271187A3 EP2271187A3 (de) 2013-03-20
EP2271187B1 true EP2271187B1 (de) 2017-04-19

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FI (1) FI121561B (de)

Citations (18)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS61179096A (ja) 1985-01-24 1986-08-11 松下電工株式会社 放電灯点灯装置
US4873471A (en) 1986-03-28 1989-10-10 Thomas Industries Inc. High frequency ballast for gaseous discharge lamps
EP0461441B1 (de) 1990-06-06 1994-11-30 Zumtobel Aktiengesellschaft Verfahren und Schaltungsanordnung zur Regelung der Helligkeit (Dimmen) von Gasentladungslampen
EP1066739A1 (de) 1997-12-23 2001-01-10 Tridonic Bauelemente GmbH Verfahren und vorrichtung zum erfassen des in einer gasentladungslampe auftretenden gleichrichteffekts
WO2003098790A1 (en) 2002-05-15 2003-11-27 Philips Intellectual Property & Standards Gmbh Circuit arrangement for a resonant converter and method of operating said converter
WO2003103127A1 (de) 2002-05-29 2003-12-11 Siemens Aktiengesellschaft Messschaltung
US6759813B2 (en) 2002-02-13 2004-07-06 Patent-Treuhand-Gesellschaft für elektrische Glühlampen mbH Operating circuit for a discharge lamp with frequency-variable ignition
WO2004071136A1 (en) 2003-02-04 2004-08-19 Koninklijke Philips Electronics N.V. Circuit arrangement
US6891339B2 (en) 2002-09-19 2005-05-10 International Rectifier Corporation Adaptive CFL control circuit
WO2005083872A1 (de) 2004-03-01 2005-09-09 Tridonicatco Gmbh & Co. Kg Überstrom und mittenpunktspannungserfassung
WO2006003560A1 (en) 2004-06-28 2006-01-12 Koninklijke Philips Electronics N.V. Fluorescent tube lamp drive circuit
DE102004037389A1 (de) 2004-08-02 2006-03-16 Infineon Technologies Ag Verfahren zur Ansteuerung einer eine Leuchtstofflampe aufweisenden Last zur Optimierung des Zündvorganges
EP1333707B1 (de) 2002-02-01 2006-08-02 TridonicAtco GmbH & Co. KG Elektronisches Vorschaltgerät für Gasentladungslampe
US20060197470A1 (en) 2005-03-04 2006-09-07 Ribarich Thomas J Automotive high intensity discharge lamp ballast circuit
DE102005020178A1 (de) 2005-04-28 2006-11-09 HÜCO electronic GmbH Schaltungsvorrichtung und Verfahren zum Betreiben einer Lampe
EP1776000A2 (de) 2005-10-12 2007-04-18 International Rectifier Corporation 8-beinige integrierte Schaltung für ein Vorschaltgerät mit Leistungsfaktorkorrektur
WO2008119613A1 (en) 2007-03-30 2008-10-09 Osram Gesellschaft mit beschränkter Haftung Method of ignition regulation of discharge lamp and the corresponding electronic ballast circuit
FI20075702A (fi) 2007-10-04 2009-04-05 Helvar Oy Ab Elektroninen liitäntälaite

Patent Citations (20)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS61179096A (ja) 1985-01-24 1986-08-11 松下電工株式会社 放電灯点灯装置
US4873471A (en) 1986-03-28 1989-10-10 Thomas Industries Inc. High frequency ballast for gaseous discharge lamps
EP0461441B1 (de) 1990-06-06 1994-11-30 Zumtobel Aktiengesellschaft Verfahren und Schaltungsanordnung zur Regelung der Helligkeit (Dimmen) von Gasentladungslampen
EP1066739A1 (de) 1997-12-23 2001-01-10 Tridonic Bauelemente GmbH Verfahren und vorrichtung zum erfassen des in einer gasentladungslampe auftretenden gleichrichteffekts
EP1333707B1 (de) 2002-02-01 2006-08-02 TridonicAtco GmbH & Co. KG Elektronisches Vorschaltgerät für Gasentladungslampe
US6759813B2 (en) 2002-02-13 2004-07-06 Patent-Treuhand-Gesellschaft für elektrische Glühlampen mbH Operating circuit for a discharge lamp with frequency-variable ignition
WO2003098790A1 (en) 2002-05-15 2003-11-27 Philips Intellectual Property & Standards Gmbh Circuit arrangement for a resonant converter and method of operating said converter
WO2003103127A1 (de) 2002-05-29 2003-12-11 Siemens Aktiengesellschaft Messschaltung
US6891339B2 (en) 2002-09-19 2005-05-10 International Rectifier Corporation Adaptive CFL control circuit
WO2004071136A1 (en) 2003-02-04 2004-08-19 Koninklijke Philips Electronics N.V. Circuit arrangement
EP1593290B1 (de) 2003-02-04 2007-07-04 Koninklijke Philips Electronics N.V. Schaltungsanordnung
WO2005083872A1 (de) 2004-03-01 2005-09-09 Tridonicatco Gmbh & Co. Kg Überstrom und mittenpunktspannungserfassung
WO2006003560A1 (en) 2004-06-28 2006-01-12 Koninklijke Philips Electronics N.V. Fluorescent tube lamp drive circuit
DE102004037389A1 (de) 2004-08-02 2006-03-16 Infineon Technologies Ag Verfahren zur Ansteuerung einer eine Leuchtstofflampe aufweisenden Last zur Optimierung des Zündvorganges
US20060197470A1 (en) 2005-03-04 2006-09-07 Ribarich Thomas J Automotive high intensity discharge lamp ballast circuit
DE102005020178A1 (de) 2005-04-28 2006-11-09 HÜCO electronic GmbH Schaltungsvorrichtung und Verfahren zum Betreiben einer Lampe
EP1776000A2 (de) 2005-10-12 2007-04-18 International Rectifier Corporation 8-beinige integrierte Schaltung für ein Vorschaltgerät mit Leistungsfaktorkorrektur
WO2008119613A1 (en) 2007-03-30 2008-10-09 Osram Gesellschaft mit beschränkter Haftung Method of ignition regulation of discharge lamp and the corresponding electronic ballast circuit
FI20075702A (fi) 2007-10-04 2009-04-05 Helvar Oy Ab Elektroninen liitäntälaite
EP2046099A1 (de) 2007-10-04 2009-04-08 Helvar Oy Ab Vorrichtung für eine elektronische Verbindung für eine Lampe

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
DOSH M ET AL.: "Low Frequency Architecture for Multi-Lamp CCFL Systems with Capactive Ignition", JOURNAL OF DISPLAY TECHNOLOGY, vol. 5, no. 5, May 2009 (2009-05-01)

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Publication number Publication date
EP2271187A2 (de) 2011-01-05
FI121561B (fi) 2010-12-31
FI20095737A0 (fi) 2009-06-30
EP2271187A3 (de) 2013-03-20

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