EP2210454A1 - Circuit et procédé d'actionnement d'une lampe à décharge à haute densité - Google Patents

Circuit et procédé d'actionnement d'une lampe à décharge à haute densité

Info

Publication number
EP2210454A1
EP2210454A1 EP07822542A EP07822542A EP2210454A1 EP 2210454 A1 EP2210454 A1 EP 2210454A1 EP 07822542 A EP07822542 A EP 07822542A EP 07822542 A EP07822542 A EP 07822542A EP 2210454 A1 EP2210454 A1 EP 2210454A1
Authority
EP
European Patent Office
Prior art keywords
circuit
signal
operating
discharge lamp
pressure discharge
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.)
Withdrawn
Application number
EP07822542A
Other languages
German (de)
English (en)
Inventor
Christian Breuer
Andreas Huber
Bernhard Reiter
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 EP2210454A1 publication Critical patent/EP2210454A1/fr
Withdrawn legal-status Critical Current

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
    • H05B41/382—Controlling the intensity of light during the transitional start-up phase
    • H05B41/384—Controlling the intensity of light during the transitional start-up phase in case of hot-restriking
    • 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
    • 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
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
    • Y02B20/00—Energy efficient lighting technologies, e.g. halogen lamps or gas discharge lamps

Definitions

  • the present invention relates to a circuit arrangement for operating a high pressure discharge lamp with an operating circuit for the high pressure discharge lamp having an input for receiving a turn-on / off switching signal for the high-pressure discharge lamp and min ⁇ least one output for providing an operation signal to the high-pressure discharge lamp. It moreover relates to a method for operating a high-pressure discharge lamp on such a circuit arrangement.
  • the present invention particularly relates to the problem ⁇ lematics of the re-ignition of high-pressure discharge lamps, as used in particular in rear-projection TVs and beamers.
  • Such high-pressure discharge lamps need a cooling period after switching off before they can be successfully re-ignited. As a result, they can not be switched on again as soon as they are switched off, as users of conventional televisions are used to.
  • Such high-pressure discharge lamps are cooled after switching off for a certain time be ⁇ before a new ignition attempt is made.
  • the cooling phase usually lasts between 30 seconds and 3 minutes. Especially with rear projection televisions, this long reignition time is undesirable. From US 2002/0135324 Al a method for operating a dc operated discharge lamp is known.
  • the cited document deals with the problem that when a discharge lamp is switched off, the mercury vaporized during operation condenses on one of the two electrodes of the discharge lamp, thereby increasing the risk of a short circuit with the other electrode.
  • the cited document proposes to cool the lamp by reducing the power to ensure that the mercury condenses at a point other than on the electrode.
  • the present invention is therefore based on the object of developing a circuit arrangement mentioned at the outset or an initially mentioned method such that a shortened reignition time is made possible as a result.
  • the present invention is based on the recognition that the solution of this problem is made possible if the lamp is put in a kind of stand-by mode before the actual switch-off.
  • the discharge lamp is operated at a lower power than in normal operation, whereby the discharge lamp all ⁇ gradually, possibly favors by cooling means of a fan, continues to cool.
  • the lamp is preferably cooled to a temperature from ⁇ where they can be re-ignited after an actual shutdown immediately.
  • the lamp can be anytime soon again harnessgefah ⁇ ren.
  • a quasi-DC signal is a signal which essentially represents a DC signal, in particular also a pure DC signal, for example.
  • the lamp instead of from the AC source, which is intended for normal operation are fed from a sepa ⁇ rate DC source.
  • the operating circuit may include a bridge circuit having at least a first and a second electronic switch, wherein the operating circuit further comprises a drive circuit for at least the first and the second electronic switch, wherein the drive circuit is adapted to control the at least first and second electronic switch, the bridge circuit provides at least the AC signal at its output.
  • the loading ⁇ driving circuit may include a DC voltage source where ⁇ is designed for the operating circuit, to couple the output to the DC voltage source under the predetermined power threshold.
  • the drive circuit could also be designed to control at least the first and the second electronic switch in such a way that the bridge circuit also provides the quasi-DC signal at its output. In that case, no separate DC voltage source would have to be provided.
  • Is a bridge circuit a full bridge used where angeord- at the high pressure discharge lamp in the bridge branch ⁇ is net, diagonal switches are switched simultaneously.
  • the full bridge is fed by a direct voltage source ⁇ , in particular of the so genann ⁇ th intermediate circuit voltage.
  • the DC voltage source is coupled by the simultaneous switching of the switches located diagonally with alternating polarity with the high-pressure discharge lamp.
  • a commutation consists of turning off the diagonal switch and switching on the switches in the other diagonal.
  • Two adjacent switches are connected to the negative pole of the DC voltage source, the other two with the positive pole.
  • the negative pole represents the reference potential of the circuit arrangement.
  • the switches coupled to the negative pole are therefore usually easy to control.
  • the coupled with the positive pole switch are referred to as high-level switch and are known to be expensive to control.
  • the drive circuit accordingly comprises a low-side driver for the switch coupled to the negative pole and a high-side driver for the pole coupled to the positive pole, the low-side driver and the high-side driver each having an output for coupling to the respective switches, each having a control input for coupling to a control device and each having a supply port for coupling to a connector for connecting a supply voltage, wherein the high-side driver, a is condensate ⁇ sator, associated with a charge pump, in particular between the supply terminal and the midpoint between the first and the second electronic switch is coupled.
  • the charge pump preferably further comprises a diode which is coupled between the capacitor and the supply voltage connection such that a current flow from the capacitor to the supply voltage connection is prevented.
  • the Ansteu ⁇ erscnies is designed to provide the quasi-DC signal by Aus ⁇ management of pseudo-commutations. These are two commutations executed in rapid succession, with the first commutation being so short that it is more or less suppressed.
  • the first commutation is so short that it is more or less suppressed.
  • the first short commutation is barely visible in the lamp current, virtually suppressed, since the current due to the output capacitance and inductance of the ignition circuit can not reverse its flow direction so fast.
  • the lamp is thus supplied with a DC signal.
  • the short commutation is sufficient to recharge the capacitor of the charge pump.
  • a typical commutation during normal operation takes about 50 microseconds in a preferredariesbei ⁇ play.
  • the ratio between short and long commutation for realizing a quasi-DC signal is preferably in the range between 1: 500 and 1: 10000.
  • the drive circuit is designed to perform the Pseudo-commutations with a frequency between 50 Hz and 1 kHz, preferably 500 Hz.
  • a sufficient energy supply of acting as anode electrode of the high-pressure discharge lamp can be ensured ⁇ one hand, so that the emission temperature is exceeded and the lamp arc is not quenched.
  • a cooling of the lamp can be achieved by the discharge lamp immediately after the turn-off operation of the high pressure, a re-ignition of the high-pressure discharge lamp possible.
  • a sufficient recharging of the capacitor of the charge pump elegantge ⁇ represents may be such a frequency of pseudo-commutations.
  • the drive circuit is designed to store the polarity during the last quasi-DC operation when switching off, wherein the drive circuit is further designed to use the other polarity at the next shutdown for the quasi-DC operation.
  • the drive circuit comprises a timing device, wherein the drive circuit is further designed, after a predetermined period of time in which the Hochlichentlä- dungs lamp was operated with a quasi-DC signal of a predetermined power to adjust the operation of Hochtikentla ⁇ tion lamp, ie the Switch off high pressure discharge ⁇ lamp.
  • a temperature measuring device may be used which determines whether the high pressure discharge lamp has cooled to a temperature that allows for immediate reignition. By The time measuring device and / or the temperature measuring device will minimize the phase in which the high-pressure discharge lamp is operated at lower power but still consumes energy.
  • FIG. 1 in a schematic representation of the structure of a circuit arrangement according to the invention
  • FIG. 2 shows the time profile of the power supply of the high-pressure discharge lamp
  • FIG. 3 shows the time profile of the lamp current without pseudo-commutations
  • Fig. 1 shows a schematic representation of an embodiment of an inventive Heidelbergungsanord ⁇ tion.
  • This comprises a first El and a second input terminal E2, between which a DC voltage is to be connected, preferably the so-called intermediate circuit voltage, which is of the order of magnitude of between 300 and 400 V.
  • a DC low-voltage power supply unit 10 is connected, which at a first output Al a DC voltage of 5 V to a microcontroller 12, and at a second output A2 a DC voltage of 15 V to a high-side driver 14 and a low-side driver 16 provides.
  • the microcontroller 12 controls the low-side driver 16 directly, the high-side driver 14 via a potential separation unit 18th
  • a charge pump is coupled, which comprises a diode Dl and a con ⁇ capacitor C1.
  • the capacitor Cl is connected to an alternating selwoods provoke illustrating the present Brü ⁇ ckenstoffddling BMI a bridge circuit 20th
  • the potential of the bridge center point BM1 is supplied to the high-side driver 14 as a reference potential, while the low-side driver 16 receives the reference potential as the ground potential, which represents the potential at the input terminal E2.
  • the bridge circuit 20 includes four electronic scarf ⁇ ter Sl, S2, S3, S4, wherein currency, S4 known to be opened simultaneously in operation the switches of the diagonal Sl rend the switches of the other diagonal S2, S3 CLOSED ⁇ sen, and vice versa.
  • a high-pressure discharge lamp La is coupled via an ignition circuit, which comprises two inductors L 1, L 2 coupled together and a capacitor C 2, between the two bridge centers BM 1, BM 2.
  • the high-side driver 14 is used to control the switches Sl, S3, while the low-side driver 16 is used to control the switches S2, S4.
  • the bridge center point BMI changes accordingly be Potenzi ⁇ al in dependence of the position of the switches Sl, S2 between 0 V and U ZW. Recharging the capacitor Cl to supply the high-side driver 14 is made possible when the bridge center point BM1 is at ground potential, ie the switch S2 is closed and the switch S1 is open.
  • the lamp La is supplied instead of performing pseudo ⁇ commutations a DC signal via a power supply and a rectifier as soon as the lamp is supplied Power has fallen so far that when operating the lamp with an AC signal there is a risk of extinguishing the lamp arch.
  • Fig. 2 shows a schematic representation of the time course of the power P, which is the high-pressure discharge lamp La is supplied.
  • the lamp is operated in normal operation at 100% power ⁇ .
  • the operator wants to turn off the projector in which the high-pressure discharge lamp La is mounted.
  • the microcontroller 12 is supplied via a not-shown in Fig. 1 interface ent ⁇ speaking signal, after which the circuit arrangement according to the invention begins to down-regulate the power supplied to the lamp La.
  • the high-pressure discharge lamp La is operated with an AC signal.
  • the high-pressure discharge lamp La is operated with so-called pseudo-commutations.
  • the power supplied to the lamp power is then further lowered until the time t3, the so-called stand-by mode, it ⁇ ranges is where the lamp is operated with pseudo-commutations of a frequency in the order of 500 Hz, to ensure that the capacitor Cl is sufficiently recharged in order to ensure a ssensge ⁇ MAESSEN operation of the high-side driver fourteenth
  • the lamp is operated with et- wa 20% of their normal performance.
  • the lamp cools down further, so that at the time t 4 , the which is determined by specifying the period ti to t 4 or Mes ⁇ sen the lamp temperature has reached a temperature that allows an immediate successful re-ignition after a shutdown.
  • the lamp La can be dergezündet immediately successful as ⁇ , if an operator wishes. Accordingly, there is no time when the lamp La could not be turned on again immediately.
  • FIG. 3 shows the time profile of the lamp current, without a pseudo-commutation taking place.
  • the commutations are numbered 1 to 14.
  • UNMit ⁇ directly upstream of a commutation of the lamp current is pulse-shaped increased. This is a measure to reduce flicker phenomena, in particular flicker and bow marks, as described for example in the document WO 95/35645. This measure is independent of the implementation of pseudo-commutations according to one aspect of the present invention.
  • the frequency of the rectangular profile of the current is üb ⁇ SHORT- between 200 Hz and 5 kHz.

Landscapes

  • Circuit Arrangements For Discharge Lamps (AREA)

Abstract

La présente invention concerne un circuit pour l'actionnement d'une lampe à décharge à haute densité (La) comportant un circuit de service pour la lampe à décharge à haute densité, avec une entrée servant à la réception d'un signal d'allumage/d'extinction pour la lampe à décharge à haute densité (La) et au moins une sortie servant à l'envoi d'un signal de service à la lampe à décharge à haute densité (La). Le circuit de service est conçu pour abaisser, après la réception d'un signal d'extinction sur son entrée, la puissance (P) du signal de service, fournie sur la ou les sorties. Le circuit de service est en outre conçu pour fournir le signal de service en tant que signal CA au-dessus d'une valeur seuil de puissance prédéfinissable et en tant que signal quasi CC en dessous de la valeur seuil de puissance prédéfinissable. L'invention concerne par ailleurs un procédé d'actionnement d'une lampe à décharge à haute densité (La) dans un tel circuit.
EP07822542A 2007-11-13 2007-11-13 Circuit et procédé d'actionnement d'une lampe à décharge à haute densité Withdrawn EP2210454A1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/EP2007/062269 WO2009062542A1 (fr) 2007-11-13 2007-11-13 Circuit et procédé d'actionnement d'une lampe à décharge à haute densité

Publications (1)

Publication Number Publication Date
EP2210454A1 true EP2210454A1 (fr) 2010-07-28

Family

ID=39618828

Family Applications (1)

Application Number Title Priority Date Filing Date
EP07822542A Withdrawn EP2210454A1 (fr) 2007-11-13 2007-11-13 Circuit et procédé d'actionnement d'une lampe à décharge à haute densité

Country Status (7)

Country Link
US (1) US8593072B2 (fr)
EP (1) EP2210454A1 (fr)
JP (1) JP5249342B2 (fr)
KR (1) KR20100098631A (fr)
CN (1) CN101855945B (fr)
TW (1) TW200932052A (fr)
WO (1) WO2009062542A1 (fr)

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US8901344B2 (en) 2008-12-16 2014-12-02 Basf Se Production of carboxylic acid esters by stripping with alcohol vapor
US8472865B2 (en) * 2010-08-12 2013-06-25 Babak Taherloo Echo light complex
JP6034312B2 (ja) 2011-03-10 2016-11-30 コーニンクレッカ フィリップス エヌ ヴェＫｏｎｉｎｋｌｉｊｋｅ Ｐｈｉｌｉｐｓ Ｎ．Ｖ． ガス放電ランプを駆動する方法
KR101360685B1 (ko) * 2012-05-31 2014-02-10 엘지이노텍 주식회사 대기전력 절감 조명 시스템

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TW339496B (en) 1994-06-22 1998-09-01 Philips Electronics Nv Method and circuit arrangement for operating a high-pressure discharge lamp
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Also Published As

Publication number Publication date
KR20100098631A (ko) 2010-09-08
JP5249342B2 (ja) 2013-07-31
WO2009062542A1 (fr) 2009-05-22
US20100270934A1 (en) 2010-10-28
JP2011503810A (ja) 2011-01-27
US8593072B2 (en) 2013-11-26
CN101855945B (zh) 2013-10-23
TW200932052A (en) 2009-07-16
CN101855945A (zh) 2010-10-06

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