EP2526742B1 - Schaltungsanorndung und verfahren zum betreiben einer hochdruckentladungslampe unterhalb ihrer nominalen leistung - Google Patents

Schaltungsanorndung und verfahren zum betreiben einer hochdruckentladungslampe unterhalb ihrer nominalen leistung Download PDF

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Publication number
EP2526742B1
EP2526742B1 EP11779370.3A EP11779370A EP2526742B1 EP 2526742 B1 EP2526742 B1 EP 2526742B1 EP 11779370 A EP11779370 A EP 11779370A EP 2526742 B1 EP2526742 B1 EP 2526742B1
Authority
EP
European Patent Office
Prior art keywords
current
threshold value
cycles
lamp
absolute value
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.)
Not-in-force
Application number
EP11779370.3A
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German (de)
English (en)
French (fr)
Other versions
EP2526742A1 (de
Inventor
Joachim MÜHLSCHLEGEL
Andreas Kloss
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
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Osram GmbH
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Publication date
Application filed by Osram GmbH filed Critical Osram GmbH
Publication of EP2526742A1 publication Critical patent/EP2526742A1/de
Application granted granted Critical
Publication of EP2526742B1 publication Critical patent/EP2526742B1/de
Not-in-force legal-status Critical Current
Anticipated expiration legal-status Critical

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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
    • 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
    • H05B41/2928—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 a high-pressure discharge lamp below its nominal power with an alternating voltage and an alternating current of a predetermined operating frequency.
  • the invention is based on a method for operating a high pressure discharge lamp below its nominal power with an alternating current of a predetermined operating frequency according to the preamble of the main claim.
  • high-pressure discharge lamps also referred to below as lamps
  • lamps are operated in dimmed fashion
  • various problems arise.
  • Virtually all standard high pressure discharge lamps are optimized for nominal power so that the plasma physical processes and the thermal budget of the lamp perform optimally at nominal lamp power and have the highest efficiency.
  • the nominal output of the high-pressure discharge lamp is considered below to be the power specified by the manufacturer for this lamp.
  • Due to the optimized plasma-physical processes and the likewise optimized thermal budget of the high-pressure discharge lamp the high-pressure discharge lamp has a good operating stability during operation with its nominal lamp power or rated power. When dimming high pressure discharge lamps, the operating stability suffers sometimes considerably, since the thermal budget of the burner with increasing dimming level must always work further away from its optimum.
  • a rectangular low-frequency operating current is used, which is also called “wobbly DC operation".
  • a substantially rectangular current with a frequency of usually 50 Hz up to a few kHz is applied to the lamp.
  • the lamp With each swing between positive and negative voltage, the lamp commutates, as the current direction reverses and the current thus briefly becomes zero. This operation ensures that the electrodes of the lamp are uniformly loaded despite a quasi-DC operation.
  • a projector which operates a high-pressure discharge lamp with a rectangular current form, wherein the projector can operate the Hochlichent charge lamp depending on their state (eg aging state) with a pent roof-shaped current form.
  • the bow approach to the electrodes is fundamentally problematic when operating a gas discharge lamp with alternating current.
  • the transition cathode-anode is inherently unproblematic, since the temperature the electrode has no influence on its anodic operation.
  • the ability of the electrode to supply a sufficiently high current depends on its temperature.
  • the arc changes during commutation, usually after the zero crossing, from a brief diffuse arc approach mode (so-called, diffuse-mode '), to a punctiform Bogenansatz istlus (so-called, spot-mode'). This change is sometimes accompanied by an often visible collapse of the light emission, which can be perceived as flickering.
  • the electrodes of the high-pressure discharge lamp become ever colder and, when the operating current is commutated, the lamp can start to flicker and become unstable. These instabilities in commutation sometimes cause significant electromagnetic interference.
  • behaves at the beginning of the half periods to the amount of current
  • 1: 1, 5 .. 1: 3, 0.
  • the upper limit is 120 Hz. This makes it possible to dimming commercially available lamps safely.
  • the upper limit is 80 Hz.
  • the upper limit is 1 Hz.
  • the predetermined operating frequency is usually 160Hz.
  • the pitched roof-shaped current form according to the invention at the end of the half periods is increased in a preferred embodiment, when a threshold value for the difference of the lamp voltages at the end and at the beginning of the half periods is not reached.
  • the threshold value for the difference of the lamp voltages is divided into a lower threshold value and an upper threshold value, and the magnitude of the current
  • the threshold value for the difference of the lamp voltages is divided into a lower threshold and an upper threshold, and the magnitude of the current
  • increases at the end of the half periods
  • the upper threshold value is exceeded, the magnitude of the current
  • the threshold value for the difference between the lamp voltages is preferably between 0.2 volts and 3 volts. Furthermore, the upper threshold is at most 0.5 volts greater than the lower threshold.
  • the current form of the alternating current at nominal power is preferably rectangular.
  • the current form of the alternating current at nominal power is preferably pentachelike, with the magnitude of the current
  • 1: 1 .. 1: 1, 2.
  • the solution of the problem with respect to the circuit arrangement is carried out with a circuit arrangement for operating a High pressure discharge lamp below its nominal power, wherein the high pressure discharge lamp is operated at nominal power with an alternating current of a predetermined operating frequency, and the circuit arrangement carries out the method described above.
  • the circuit arrangement can be constructed in a conventional manner.
  • the circuit may include a power factor correction circuit which supplies at its output an intermediate voltage circuit to which an inverter in the form of a full or half bridge is connected.
  • the circuit arrangement may include a pulse or a resonance ignition device in order to ignite the high-pressure discharge lamp.
  • the circuitry may include analog or digital control circuitry that controls the power factor correction circuit and the inverter.
  • the circuit arrangement preferably has a digital control circuit with a microcontroller.
  • Fig.1 shows a lamp voltage curve with very weak diffuse-spot transition at nominal power (curve 10) and strong diffuse-spot transition 122 in dimming mode (53% of the nominal power, curve 12) at a temporal resolution of 10 ⁇ s / div.
  • Fig. 2 shows the lamp current waveform of the signals Fig. 1 with very weak diffuse-spot transition at nominal power (curve 20) and pronounced diffuse-spot transition 221 in dimming mode (53% of nominal power, curve 22) with a temporal resolution of 10 ⁇ s / div.
  • the lamp current at the end of the half-period is twice as large as at the beginning of the half-period.
  • the lamp current is variable during the half periods and depends on the change of the lamp voltage during a half period.
  • depends on the lamp voltage and especially after the change of the lamp voltage, which is applied during the half-period.
  • the change in the lamp current in a half period is set so that the lamp voltage has increased by a previously calculated or a predetermined value ⁇ U 1 , ⁇ U 2 .
  • the threshold value for the voltage increase of the lamp voltage in the half-period is between 0.2V and 4V depending on the gas discharge lamp.
  • the threshold is preferably divided into a lower threshold and an upper threshold.
  • the voltage increase is calculated from the difference of the lamp voltage at the end of the half-period to the lamp voltage at the beginning of the half-period. If the threshold value for the lamp voltage rise is not reached within the half period, the ratio of starting current to final current for the next half cycle
  • increases when a lower threshold value for the voltage increase of the lamp voltage is exceeded in the half-period, and lowered when an upper threshold value for the voltage increase of the lamp voltage in the half-period is exceeded. If the increase of the lamp voltage lies in the range between the lower and the upper threshold, then the ratio of starting current to final current for the next half cycle
  • Fig. 3 shows the lamp current characteristics at 50 Hz
  • curve 30 shows the lamp current profile at 100% of the nominal power
  • curve 32 shows the lamp current profile at 55% of the nominal power with a method of operation according to the prior art
  • curve 34 shows the lamp current profile at 55% of the nominal power with the operating method according to the invention at a time resolution of 10 ms / div.
  • the pent roof-shaped current profile can be clearly seen in the curve 34, here the lamp current at the end of the half-period is twice as large as at the beginning of the half-period. However, this would not be enough to ensure stable operation of the high-pressure discharge lamp at low dimming levels.
  • the dimming operation the operating frequency is lowered below an upper limit to achieve this stable operation.
  • the upper limit is a maximum of 120Hz, preferably the operating frequency is lowered to a frequency around 50Hz to 60Hz.
  • Lower frequencies can be problematic because at an operating frequency below 50Hz, the human eye exhibits increased flicker sensitivity on the dimming operation has a negative effect. Only below a hertz decreases the flicker sensitivity of the human eye, so that even very low operating frequencies are possible.
  • the particularly preferred operating frequency of the invention is thus at 50Hz to 60Hz, at very low dimming levels below 1Hz.
  • Fig. 4 shows a section of the commutation of the lamp current waveforms at 50 Hz Fig. 3 in higher time resolution
  • curve 40 the lamp current profile at 100% of the nominal power
  • curve 42 the lamp current profile at 55% of the nominal power with a method of operation according to the prior art
  • curve 44 the lamp current profile at 55% of the nominal power with the inventive method.
  • the time resolution is no longer 10ms / div, but only 10 ⁇ s / div. Shown in particular is the commutation of the lamp current. It can clearly be seen that significantly fewer disturbances occur in the operating method according to the invention (curve 44) than in a method of operation according to the prior art (curve 42). With the operating method according to the invention occur virtually no disturbances in the commutation of the lamp current more, and a circuit arrangement that performs the operating method according to the invention is significantly easier to suppress interference, and thus also significantly cheaper to produce.

Landscapes

  • Circuit Arrangements For Discharge Lamps (AREA)
EP11779370.3A 2010-11-09 2011-10-24 Schaltungsanorndung und verfahren zum betreiben einer hochdruckentladungslampe unterhalb ihrer nominalen leistung Not-in-force EP2526742B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102010043604 2010-11-09
PCT/EP2011/068509 WO2012062556A1 (de) 2010-11-09 2011-10-24 Schaltungsanorndung und verfahren zum betreiben einer hochdruckentladungslampe unterhalb ihrer nominalen leistung

Publications (2)

Publication Number Publication Date
EP2526742A1 EP2526742A1 (de) 2012-11-28
EP2526742B1 true EP2526742B1 (de) 2014-06-11

Family

ID=44910192

Family Applications (1)

Application Number Title Priority Date Filing Date
EP11779370.3A Not-in-force EP2526742B1 (de) 2010-11-09 2011-10-24 Schaltungsanorndung und verfahren zum betreiben einer hochdruckentladungslampe unterhalb ihrer nominalen leistung

Country Status (4)

Country Link
US (1) US20130229128A1 (zh)
EP (1) EP2526742B1 (zh)
CN (1) CN103202104A (zh)
WO (1) WO2012062556A1 (zh)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102013219694A1 (de) * 2013-09-30 2015-04-02 Automotive Lighting Reutlingen Gmbh Verfahren zum Betreiben einer Gasentladungslampe eines Lichtmoduls

Family Cites Families (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5691605A (en) * 1995-03-31 1997-11-25 Philips Electronics North America Electronic ballast with interface circuitry for multiple dimming inputs
GB2325099A (en) * 1997-05-07 1998-11-11 David John Aarons Gas discharge lamp drive circuit; dimming
JP2002134287A (ja) * 2000-10-24 2002-05-10 Tdk Corp 放電灯点灯方法及び装置
JP3893042B2 (ja) * 2001-10-26 2007-03-14 松下電器産業株式会社 高圧放電ランプの点灯方法、点灯装置及び高圧放電ランプ装置
ATE343313T1 (de) * 2001-11-30 2006-11-15 Koninkl Philips Electronics Nv Verfahren und vorrichtung zum steuern einer entladungslampe
JP4244747B2 (ja) * 2002-11-08 2009-03-25 ウシオ電機株式会社 高圧放電ランプ点灯装置
JP4637675B2 (ja) * 2005-07-27 2011-02-23 三菱電機株式会社 ランプ点灯装置
JP4470985B2 (ja) * 2007-09-28 2010-06-02 セイコーエプソン株式会社 光源装置、及びプロジェクタ
JP4697326B2 (ja) * 2009-04-01 2011-06-08 ウシオ電機株式会社 高圧放電ランプ点灯装置

Also Published As

Publication number Publication date
EP2526742A1 (de) 2012-11-28
CN103202104A (zh) 2013-07-10
US20130229128A1 (en) 2013-09-05
WO2012062556A1 (de) 2012-05-18

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