EP2462784A1 - Procédé de mise en service d'une lampe à décharge, ainsi qu'agencement de circuit pour le fonctionnement de celle-ci - Google Patents

Procédé de mise en service d'une lampe à décharge, ainsi qu'agencement de circuit pour le fonctionnement de celle-ci

Info

Publication number
EP2462784A1
EP2462784A1 EP10739332A EP10739332A EP2462784A1 EP 2462784 A1 EP2462784 A1 EP 2462784A1 EP 10739332 A EP10739332 A EP 10739332A EP 10739332 A EP10739332 A EP 10739332A EP 2462784 A1 EP2462784 A1 EP 2462784A1
Authority
EP
European Patent Office
Prior art keywords
current
potential
circuit
circuit arrangement
frequency
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
Application number
EP10739332A
Other languages
German (de)
English (en)
Other versions
EP2462784B1 (fr
Inventor
Thomas Pollischansky
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.)
Osram GmbH
Original Assignee
Osram GmbH
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.)
Filing date
Publication date
Application filed by Osram GmbH filed Critical Osram GmbH
Publication of EP2462784A1 publication Critical patent/EP2462784A1/fr
Application granted granted Critical
Publication of EP2462784B1 publication Critical patent/EP2462784B1/fr
Not-in-force legal-status Critical Current
Anticipated expiration legal-status Critical

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
    • H05B41/26—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

Definitions

  • the invention relates to a method for starting up a discharge lamp according to the preamble of claim 1. It also relates to a circuit arrangement for operating a discharge lamp according to the preamble of claim 3.
  • the invention relates to a circuit arrangement for operating a discharge lamp according to the preamble of patent claim 3, as used in the applicant's own house, and by which the method according to the preamble of claim 1 is implemented:
  • the circuit arrangement has a resonant circuit, with a capacitive element connected in parallel with the discharge lamp and an inductive element in series in front of the lamp and the capacitive element and behind a circuit point between two switches.
  • the switches typically designed as MOSFETs, are used to apply power to the resonant circuit.
  • the means for effecting comprise an application specific integrated circuit (ASIC), from which potential outputs are connected to the control inputs of MOSFETs.
  • ASIC application specific integrated circuit
  • the resonant circuit is there to provide for the provision of an ignition voltage across the electrodes of the lamp, ie parallel to the capacitive element of the resonant circuit.
  • the circuit arrangement for measuring the current intensity of a current flowing through one of the switches, and suitable means for determining the switching frequency define these during ignition as a function of the measured current intensity.
  • the electrodes Prior to the ignition of the discharge lamp, the electrodes, which are typically helical, are to be preheated. Preheating is accomplished by providing ohmic heat loss by sending a current through the electrodes. This is also done in the circuit arrangement by activating the switches and thereby charging the resonant circuit with alternating current. However, the frequency is different than when the lamp is lit.
  • the frequency of the alternating current during preheating was predetermined, and indeed to values above the resonant frequency of the resonant circuit.
  • the electrical parameters of electronic components may vary from item to item, even though a nominal value is desired per se. If, as before, the frequency during preheating is determined in advance, then The set preheating depends sensitive on the parameters of the electronic components, in particular of the capacitive element and the inductive element of the resonant circuit. It is then possible that a circuit arrangement is rejected as not sufficiently functioning in the production, even if all components work on their own and only parameter deviations are given in the components.
  • a regulation of the preheating current is known from some circuit arrangements.
  • the object of the present invention is to provide a method according to the preamble of patent claim 1, by which a discharge lamp is reliably put into operation, even if deviations in their electrical parameters are given in the electronic components used in this case. It is a further object of the present invention to provide a circuit arrangement for operating a discharge lamp according to the preamble of claim 3, which functions as reliably as the circuit arrangement from the applicant's home in its previous embodiment, but at the same time enables reliable preheating to ignite the lamp ,
  • the pre-heating is controlled to a predetermined current, in principle the same way as in the ignition, namely by the means for controlling the frequency are already activated before the ignition.
  • the measuring device is caused to obtain measured values for the current intensity and to transmit the means for controlling the frequency, which correspond to a current intensity which deviates in a predetermined manner from the current intensity measured during ignition.
  • the regulation is carried out on the basis of measured values for a first current strength and in a second situation the regulation on measured values for a second current intensity, in each case for the same actual current intensity.
  • the first situation is preferably that of the ignition, in which the actual current intensity is predetermined by the measured values.
  • the control can then take place on the basis of measured values which deviate from the actual current intensity in a predetermined manner.
  • the peak value of the current is measured. When this reaches a predetermined limit, the switching frequency of the half-bridge is increased.
  • Such an offset is approximately provided by the fact that a potential is applied during preheating at a circuit point which is not applied during ignition.
  • control means are provided according to the invention for influencing the measured values obtained by the means for measuring, so that when passing through a commissioning program at an appropriate time such influencing of the measured values can take place, namely in particular during preheating.
  • the control means comprises a source for providing a fixed potential (typically defined to ground) at a circuit point of the circuitry.
  • a fixed potential typically defined to ground
  • This can be z.
  • another output signal can be used which has a different potential during preheating than in the other operating states.
  • This is z.
  • the output RTPH on the Infineon control Asic ICV1FL02G By manipulating voltages dropping across resistors, and thus across these flowing currents, the measured current is also manipulated, with otherwise the same current flowing through one of the switches.
  • the means for measuring the current intensity comprise a voltage divider with two resistance elements. It is then sufficient to couple a circuit point between the two resistance elements via a further resistance element with the source in order to set the falling over the two resistive elements voltages in a different relationship.
  • the further resistance element preferably has a resistance which is at least 5 times and preferably at least 10 times as great as the maximum resistance of the two resistance elements. The reason for this is that excessively large additional currents are not to be generated, but merely the potential to be changed. that should. The greater the resistance of the further resistance element, the more the effect of a simple offset in the measurement of the current intensity is achieved.
  • the circuit arrangement comprises, as is known per se from the prior art, an application-specific circuit which has two potential outputs for driving the switches and a potential input belonging to the means for measuring and, for example, the circuit point is coupled between the two resistive elements.
  • a third potential output is provided or used, which serves to provide the source.
  • the third potential output is coupled to ground via a zener diode, to which a capacitive element is preferably connected in parallel. It then flows from the potential output current via the zener diode, and the voltage dropping at this voltage is then regarded as stable, so that a stable voltage source is provided, that is, the potential at the circuit point of the circuit arrangement is particularly well defined.
  • Fig. 1 shows the circuit diagram of a circuit arrangement for a
  • Discharge lamp according to the prior art shows a circuit diagram for a discharge lamp, as realized according to a first embodiment of the invention
  • FIG. 3 shows a circuit diagram for a discharge lamp, as realized according to a second embodiment of the invention.
  • Fig. 4 is two graphs illustrating the advantages of the invention over the prior art.
  • a capacitive element Ci is connected in parallel.
  • the two electrodes Eli and El 2 of the lamp LP are coupled to the two sides of a capacitor Ci.
  • an inductive element L is switched.
  • the electrode EI2 is coupled to a potential V via a capacitive element C2, via a capacitive element C3 to ground.
  • Two switches Qi and Q2, which are designed as MOSFETs, can couple the series connection of inductive element and discharge lamp or capacitive element Ci to the potential V.
  • the resonant circuit with the elements L and Ci is used in particular when igniting the discharge lamp LP.
  • the resonant circuit is brought close or in resonance, so that very high voltages between the electrodes Eli and El 2 are applied, so that it comes to the ignition of the discharge lamp.
  • the switch Q 2 connects the inductive element L via a resistor element R3 to ground. Parallel with the resistor element R3, a voltage divider with the resistor elements R 4 and R 5 is provided, and the circuit point between these two resistance elements R 4 and R 5 is connected to a potential input El of the application-specific circuit.
  • the potential input allows the measurement of the voltage drop across the resistor R 5 and thus the current of the current flowing through the switch Q 2 current.
  • the frequency of the opening and closing of the switches Qi and Q 2 is then determined in the application-specific circuit 100.
  • the value measured at the potential input for the potential or the voltage dropping to ground therefore determines the output potentials at the potential outputs A1 and A2 and their frequency.
  • the electrodes Eli and El 2 must be preheated.
  • the control that is used when the discharge lamp LP is ignited is not yet used.
  • a specific frequency is provided for the current intensity with which the outputs A1 and A2 are applied during preheating. It turns then a certain alternating current, which is used as a preheating current.
  • the disadvantage here is that scatters and fluctuations in the parameters of the capacitive element Ci and the inductive element L are not taken into account.
  • FIG. 4 shows on the basis of the curve 10 that, for example, when the capacitive element Ci varies between 4 and 5.5 nF Preheating current can vary between over 600 and 425 mA. This variation is too high for practical applications.
  • a further potential output A3 is provided, which is coupled via a resistance element Re to the circuit point between the resistance elements R 4 and R 5 , ultimately with the potential input El. If the resistance element R3 has a resistance of 1 ⁇ , the resistance elements R 4 and R 5 each have resistances of 1 k ⁇ , so Re is to be selected, for example, with a resistance of 10 k ⁇ .
  • a potential of 12 V is applied to ground at the potential output A3, when typically a voltage of 2 V drops across the resistance elements R 4 and R 5 , then an offset results at the potential at the node between see the resistance elements R 4 and R 5 .
  • the control threshold for the current is reduced by this offset.
  • the application-specific circuit 100 ' is equal to the application-specific circuit 100, the potential output A3 is additionally used. If the potential of 12 V is applied during preheating at the potential output A3, but the potentials detected above the potential input El are still measured in the interior of the application-specific circuit 100 'and the control takes place as a function of these measured values, the offset in the measured values control to a different current than would be the case if the potential at the potential output A3 is not applied.
  • the preheating current can thus be in a defined ratio to the ignition current.
  • the potential is now applied to the potential output A3, then it is regulated to a specific preheating current.
  • no potential is applied so that the circuit point between the resistance elements R 4 and R 5 remains unaffected.
  • a control of the ignition current in a conventional manner. It can be seen from the curve 12 in FIG. 4 that the same preheating current almost always flows through the regulation of the preheating current, even in the case of larger fluctuations in the value of the capacitance of the capacitive element Ci. This is exactly the desired effect.
  • the components of the control loop typically have a lower tolerance than the components L and Ci. Notwithstanding the embodiment according to FIG. 2, it can be provided according to FIG. 3 that an application-specific circuit 100 'is used which is not necessarily suitable as a voltage source. Then, the potential output A3 via a resistor element R 7 and a parallel circuit of a Zener diode and a capacitive element C 4 are coupled to ground, simultaneously via the resistor element Rs to the node between the resistive elements R 4 and R 5 . When a potential is applied to the potential output A3, then a current flows via the zener diode Z, and the voltage dropping across it is sufficiently stable to provide a type of voltage source, ie a fixed potential. In the embodiments according to FIGS.
  • the invention uses the intelligence of the application-specific circuit, as known from the prior art.
  • the intelligence is used in the prior art to control to a certain current at the ignition of the lamp LP.
  • the same intelligence can also be used to regulate to a specific current during preheating.

Landscapes

  • Circuit Arrangements For Discharge Lamps (AREA)

Abstract

Sur les agencements de circuits conventionnels, une intensité est mesurée lors de l'amorçage d'une lampe à décharge (LP) et elle est régulée en faisant varier la fréquence de ce courant d'amorçage. Ce même mode de régulation est maintenant utilisé pour le réglage du courant de préchauffage. Les valeurs de mesure de l'intensité sont manipulées lors du préchauffage d'une manière prédéterminée, mais sinon c'est le même circuit de régulation qui est utilisé à l'intérieur d'un circuit spécifique d'application (100').
EP10739332.4A 2009-08-07 2010-07-23 Methode de demarrage d'un lampa a descharge et circuit de alimentation de la lampe Not-in-force EP2462784B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE200910036645 DE102009036645A1 (de) 2009-08-07 2009-08-07 Verfahren zum Inbetriebsetzen einer Entladungslampe sowie Schaltungsanordnung zum Betreiben einer solchen
PCT/EP2010/060716 WO2011015468A1 (fr) 2009-08-07 2010-07-23 Procédé de mise en service d'une lampe à décharge, ainsi qu'agencement de circuit pour le fonctionnement de celle-ci

Publications (2)

Publication Number Publication Date
EP2462784A1 true EP2462784A1 (fr) 2012-06-13
EP2462784B1 EP2462784B1 (fr) 2013-10-02

Family

ID=43127796

Family Applications (1)

Application Number Title Priority Date Filing Date
EP10739332.4A Not-in-force EP2462784B1 (fr) 2009-08-07 2010-07-23 Methode de demarrage d'un lampa a descharge et circuit de alimentation de la lampe

Country Status (6)

Country Link
US (1) US9125282B2 (fr)
EP (1) EP2462784B1 (fr)
CN (1) CN102474967A (fr)
AU (1) AU2010280882A1 (fr)
DE (1) DE102009036645A1 (fr)
WO (1) WO2011015468A1 (fr)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2021155002A (ja) * 2020-03-30 2021-10-07 本田技研工業株式会社 車両

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2264596B (en) 1992-02-18 1995-06-14 Standards Inst Singapore A DC-AC converter for igniting and supplying a gas discharge lamp
US6008593A (en) 1997-02-12 1999-12-28 International Rectifier Corporation Closed-loop/dimming ballast controller integrated circuits
EP0986936A1 (fr) * 1998-04-02 2000-03-22 Koninklijke Philips Electronics N.V. Circuit
US5973455A (en) * 1998-05-15 1999-10-26 Energy Savings, Inc. Electronic ballast with filament cut-out
US7459867B1 (en) 2007-05-11 2008-12-02 Osram Sylvania Inc. Program start ballast

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO2011015468A1 *

Also Published As

Publication number Publication date
US20120133297A1 (en) 2012-05-31
EP2462784B1 (fr) 2013-10-02
WO2011015468A1 (fr) 2011-02-10
US9125282B2 (en) 2015-09-01
DE102009036645A1 (de) 2011-02-17
CN102474967A (zh) 2012-05-23
AU2010280882A1 (en) 2012-03-22

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