EP2067385A1 - Arrangement de circuit et procédé pour allumer une lampe à décharge - Google Patents

Arrangement de circuit et procédé pour allumer une lampe à décharge

Info

Publication number
EP2067385A1
EP2067385A1 EP06793799A EP06793799A EP2067385A1 EP 2067385 A1 EP2067385 A1 EP 2067385A1 EP 06793799 A EP06793799 A EP 06793799A EP 06793799 A EP06793799 A EP 06793799A EP 2067385 A1 EP2067385 A1 EP 2067385A1
Authority
EP
European Patent Office
Prior art keywords
variable
control loop
circuit arrangement
output
time constant
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Withdrawn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
EP06793799A
Other languages
German (de)
English (en)
Inventor
Siegfried Mayer
Olaf Busse
Arwed Storm
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 EP2067385A1 publication Critical patent/EP2067385A1/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Withdrawn legal-status Critical Current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
    • H05B41/26—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
    • 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 igniting a discharge lamp with a drive device, at the output of which a drive signal having a predeterminable frequency can be provided, an inverter which is coupled to the output of the drive device and at the output of which a rectangular signal having a predeterminable duty cycle can be provided.
  • a load circuit which is coupled to the output of the inverter and has at least one connection for the discharge lamp, a first control loop having a first reference variable, a first control variable and a first controlled variable, wherein the first control loop has a first time constant, a second control loop with a second control variable, an auxiliary control variable and a second controlled variable, wherein the second control loop has a second time constant. It also relates to a method for igniting a discharge lamp on such a circuit arrangement.
  • High and low pressure discharge lamps require high voltages for ignition, which are provided by electronic ballasts.
  • discharge lamps are used in a wide temperature range, for example, from -25 ° C to + 60 ° C.
  • the problem here is that the inductance of the lamp inductor, which is usually arranged in the load circuit, is temperature-dependent.
  • the maximum magnetic flux density and thus the inductance in the temperature range mentioned can vary by up to 20%.
  • the inductance decreases with an increase in temperature.
  • the lamp choke goes earlier at higher temperatures in saturation.
  • the resonance Frequency of the load circuit the resonance is exploited to the ignition, by about 10%. Therefore, if one approaches the resonance frequency of high frequencies, the resonance and thus the formation of high currents is achieved much earlier than at lower temperatures. This involves the risk of destruction of the switches of the inverter, which are in particular often realized as a MOSFET.
  • the present invention is therefore based on the object, the above-mentioned circuit arrangement or the aforementioned method ren educate such that it can be realized with a lamp inductor, which is dimensioned significantly smaller than in the prior art.
  • This object is achieved by a circuit arrangement having the features of claim 1 and by a method having the features of claim 11.
  • the present invention is firstly based on the recognition that in principle why the actual value U ⁇ s t of the lamp voltage U L monitored and should be increased in small steps up to the intended maximum voltage.
  • the present invention is based particularly on the insight that due to the saturation of the lamp inductor at high temperatures, a non-Lineahtusch between the actual value U ⁇ st the voltage U L of the lamp and the actual value l ⁇ st of the current I 0 occurs through the choke. Due to this non-linearity, the monitoring of the voltage alone is not sufficient, but both variables must be monitored separately, since it is no longer possible to close from one to the other.
  • the slow determination of the lamp voltage U L as a result of the measurement and control time constants is not fast enough to switch off the inverter switches.
  • the latter is in one embodiment of the invention between 200 and 400 microseconds. If the switch-on time t on of the square-wave signal driving the switch of the inverter is 3 to 10 ⁇ s, this also shows that the regulation of the lamp voltage U L with the specified time constant is too slow. Assuming that the control should be so fast that can be switched off quickly enough with an exponential increase in the current I D after saturation of the lamp inductor, one arrives at the idea according to the invention, the actual value l of the inductor current I 0 to regulate or monitor.
  • the present invention solves this problem in a particularly skilful manner in that the two control circuits, ie the inherently slow control circuit for controlling the lamp voltage and the fast control circuit for controlling the inductor current I D , are linked together. In particular, they are linked such that the auxiliary control variable of the second control loop represents the first command variable of the first control loop.
  • the second reference variable corresponds to the nominal value of the voltage across the discharge lamp
  • the second controlled variable corresponds to the actual value of the voltage across the discharge lamp
  • the first reference variable to the nominal value of the current through the inductor and the first controlled variable to the actual value of the current through the inductor in other words the actual value of the lamp voltage is gradually increased (slower control circuit) and the resulting increase in the actual value l t of the inductor current (fast control loop) is monitored.
  • the present invention therefore makes it possible to generate a particularly constant ignition voltage independent of temperature influences. Another advantage is that stable voltages can be generated with this control regardless of the slope of the load circuit.
  • the lamp inductor can be dimensioned for low-loss loss. This means that a smaller throttling design can be used, which in turn leads to more space Cost saving contributes.
  • the monitoring of the actual value of the lamp voltage in accordance with the present invention also makes it possible to realize the capacitors in a smaller dimension and a smaller design, as a result of which high voltages can be avoided.
  • the second reference variable has met the desired value of the voltage across the discharge lamp and the second controlled variable the actual value of the voltage across the discharge lamp
  • the desired value of the current through the inductor and to use the actual value of the current through the choke as second controlled variable.
  • the second reference variable preferably corresponds to the time average within a predefinable time period. In a preferred embodiment, this period is between 200 ⁇ s and 1 ms.
  • the frequency is varied in the circuit arrangements known from the prior art in order to achieve the ignition voltage, the frequency preferably remains fixed in the circuit arrangement according to the invention.
  • a frequency can be fixed, measures for varying the frequency can be omitted.
  • the first time constant is preferably 10 to 1000 ns, preferably 100 to 200 ns.
  • the second time constant is preferably 10 to 1000 ⁇ s, preferably 200 to 400 ⁇ s. If one compares the on-time t on of the inverter-driving signal, which is on the order of between 1 and 50 ⁇ s, preferably between 3 and 10 ⁇ s, it can be seen that the current regulation is much faster, the voltage regulation much slower.
  • the frequency of the switch driving the inverter driving signal is preferably in between 30 kHz and 100 kHz. The first control loop is thus so fast that, when there is an exponential increase in the current I D through the choke, after the saturation of the lamp inductor begins can be shut down quickly enough, even before the switches of the inverter critical current ranges occur.
  • the first control loop and the second control loop each have a disturbance variable which primarily represents the ambient temperature.
  • a circuit arrangement according to the invention further comprises an ignition detection device, which is designed to detect an ignition of the discharge lamp and after the detection of the ignition to switch the first and the second control loop from the ignition operation to the continuous operation.
  • an ignition detection device which is designed to detect an ignition of the discharge lamp and after the detection of the ignition to switch the first and the second control loop from the ignition operation to the continuous operation.
  • FIG. 1 is a schematic representation of the coupling of a first and a second control loop in a first embodiment of a circuit arrangement according to the invention
  • FIG. 2 is a schematic representation of the coupling of a first and a second control loop in a second embodiment of a circuit arrangement according to the invention; and 3 shows the signal flow graphs associated with the embodiment of FIG.
  • Fig. 1 shows a schematic representation of the coupling of a first, inner R 1 and a second, outer control loop R 3 according to a first embodiment of a circuit arrangement according to the invention.
  • the reference variable of the outer control loop R 3 is the desired value U SO ⁇ the lamp voltage U L of a discharge lamp, not shown.
  • the feedback signal is formed by the actual value U ⁇ st the lamp voltage U L, which simultaneously represents the controlled variable of the outer loop.
  • the differ- ence .DELTA.U from the desired value U S oi ⁇ and the actual value U ⁇ s t of the lamp voltage U L represents the control error, which is fed to a block 10, which contains for averaging a I element (integrator), and a table or a conversion formula with which from the integral on the difference .DELTA.U a setpoint I soii of the inductor current I D can be set. This serves as the control variable of the inner control loop.
  • the throttle current I 0 is formed, which is fed to a block 12 to there via a formula or a lookup table a change .DELTA.t on the turn-on and thus the duty cycle of the inverter 14, preferably as Half-bridge circuit is formed with two MOSFET transistors, signal to be supplied.
  • the inverter 14 feeds the load circuit 16 and thereby generates the actual value l of the throttle current I D - the actual value l t is used via a feedback 18 as a feedback variable of the inner control loop R 1 .
  • the lamp voltage U L is determined from the actual value ⁇ s l t of the inductor current I D of the actual value U t ⁇ s formed. This serves as a feedback variable of the outer control loop R a .
  • the time constant of the inner control loop R 1 is between 10 and 1000 ns, preferably between 100 and 200 ns.
  • the time constant of the external ren control circuit R 3 is between 10 and 1000 microseconds, preferably between 200 and 400 microseconds.
  • Fig. 2 shows a schematic representation of a second embodiment of the invention with the coupling of a first control loop R 1 and a second control loop R 3 , wherein the introduced with reference to FIG. 1 reference numerals for the same and similar elements continue to apply and therefore will not be described again ,
  • the actual value l of the inductor current I 0 is used as the controlled variable of the outer control circuit R 3 .
  • the reference variable of the outer control loop is the desired value I SO of the inductor current ID-. This variable is preferably determined at the resonant capacitor of the ignition circuit, which is part of the load circuit.
  • Fig. 3 shows the signal flow graphs associated with the embodiment of Fig. 1.
  • the desired value Usoii is set to the starting value U SO ⁇ istart in step 1 10.
  • step 120 it is checked whether U SO ⁇ is smaller than a maximum value U ma ⁇ the voltage U L to the lamp. This is to ensure avoidance of damage to the circuit arrangement that the area in which the lamp usually ignites, will not leave. If U S oi ⁇ via U ma ⁇ , this leads to the termination of the ignition process in step 130.
  • step 140 the difference .DELTA.U is formed from the current actual value U ⁇ s t of the lamp voltage U L and the predetermined desired value U SO ⁇ - This difference .DELTA.U is supplied to the block 10 and provides in step 150 the current Setpoint l SO ⁇ for the inductor current I 0 .
  • step 160 it is now checked whether the current value for l so n is smaller than a maximum current value l max . If this is not the case, in step 170, the ignition process is aborted.
  • step 12 the value ⁇ t on , that is to say the time duration by which the switch-on duration of the switches of the inverter is to be increased, is determined in step 180 on the difference .DELTA.l.
  • the current time t on becomes then calculated in step 190.
  • step 200 it is checked in step 200 whether the lamp has ignited. If this is the case, continuous operation is activated in step 210.
  • step 200 If the check in step 200 shows that the lamp has not yet ignited, U S oi ⁇ is increased by a predefinable increment ⁇ Usoii in step 220 and fed back to the input of step 120 as the current Usoii. From the control with the changed on-time t on , a new actual value l of the inductor current I D is formed in step 230 via the load circuit, which is fed back in step 170. Via the high pressure discharge lamp 20 of the inductor current is from the actual value, an actual value I 0 l ⁇ st U ⁇ st the lamp voltage U L at the step 240 is formed.
  • the achievement or exceeding of a maximum value U ma ⁇ of the lamp voltage U L and the reaching or exceeding of a maximum value l ma ⁇ of the inductor current I D were specified as termination criteria. Additionally or alternatively, it could be provided that before a termination in step 130, the lamp is operated for a predefinable period of time at a maximum value U ma ⁇ the lamp voltage U L and the abort is made only after exceeding a predeterminable period.

Landscapes

  • Circuit Arrangements For Discharge Lamps (AREA)

Abstract

La présente invention concerne un arrangement de circuit pour allumer une lampe (20) à décharge comprenant un dispositif d'amorçage à la sortie duquel peut être délivré un signal d'amorçage à une fréquence préréglable ; un onduleur (14) qui est connecté à la sortie du dispositif d'amorçage et à la sortie duquel peut être délivré un signal rectangulaire ayant un rapport cyclique préréglable ; un circuit (16) de charge qui est connecté avec la sortie de l'onduleur (14) et qui présente au moins une borne pour la lampe (20) à décharge ; un premier circuit (Ri) de régulation avec une première grandeur de référence, une première grandeur de commande et une première grandeur de régulation, le premier circuit (Ri) de régulation présentant une première constante de temps ; un deuxième circuit (Ra) de régulation avec une deuxième grandeur de référence, une grandeur de commande auxiliaire et une deuxième grandeur de régulation, le deuxième circuit (Ra) de régulation présentant une deuxième constante de temps. Selon l'invention, la grandeur de commande auxiliaire du deuxième circuit (Ra) de régulation représente la première grandeur de référence du premier circuit (Ri) de régulation et la première constante de temps est inférieure au moins d'un facteur 10 à la deuxième constante de temps. Toujours selon l'invention, la première grandeur de commande représente le rapport cyclique du signal de sortie de l'onduleur (14). L'invention concerne également un procédé pour allumer une lampe (20) de décharge sur un arrangement de circuit de ce type.
EP06793799A 2006-09-25 2006-09-25 Arrangement de circuit et procédé pour allumer une lampe à décharge Withdrawn EP2067385A1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/EP2006/066691 WO2008037290A1 (fr) 2006-09-25 2006-09-25 Arrangement de circuit et procédé pour allumer une lampe à décharge

Publications (1)

Publication Number Publication Date
EP2067385A1 true EP2067385A1 (fr) 2009-06-10

Family

ID=37433963

Family Applications (1)

Application Number Title Priority Date Filing Date
EP06793799A Withdrawn EP2067385A1 (fr) 2006-09-25 2006-09-25 Arrangement de circuit et procédé pour allumer une lampe à décharge

Country Status (5)

Country Link
US (1) US8093836B2 (fr)
EP (1) EP2067385A1 (fr)
CN (1) CN101529991B (fr)
AU (1) AU2006348908B2 (fr)
WO (1) WO2008037290A1 (fr)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
ATE502511T1 (de) 2007-11-09 2011-04-15 Osram Gmbh Elektronisches vorschaltgerät und verfahren zum betreiben mindestens einer ersten und einer zweiten entladungslampe
WO2009092447A2 (fr) * 2008-01-24 2009-07-30 Osram Gesellschaft mit beschränkter Haftung Dispositif de circuit et procédé de réglage du courant au moyen d'au moins une lampe à décharge

Family Cites Families (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4177930A (en) * 1978-05-30 1979-12-11 Polysar Resins, Inc. Closure having opening means
JPH01501787A (ja) * 1986-11-21 1989-06-22 ラガン　プラスト　アー　ベー カバー付き容器のスナップ・ロッキング装置
CN2126504U (zh) * 1992-04-21 1992-12-30 常州市长江电子材料厂 高压气体放电灯电子镇流器
US5294015A (en) * 1992-05-22 1994-03-15 Landis Plastics, Inc. Easy-open lid
US5416387A (en) * 1993-11-24 1995-05-16 California Institute Of Technology Single stage, high power factor, gas discharge lamp ballast
US5689155A (en) * 1996-10-25 1997-11-18 Yao Shung Electronic Co., Ltd. Electronic stabilizer having a variable frequency soft start circuit
US6963178B1 (en) 1998-12-07 2005-11-08 Systel Development And Industries Ltd. Apparatus for controlling operation of gas discharge devices
US6326740B1 (en) * 1998-12-22 2001-12-04 Philips Electronics North America Corporation High frequency electronic ballast for multiple lamp independent operation
DE10240807A1 (de) * 2002-08-30 2004-03-11 Patent-Treuhand-Gesellschaft für elektrische Glühlampen mbH Verfahren zum Betreiben von Leuchtstofflampen und Vorschaltgerät
US7525256B2 (en) * 2004-10-29 2009-04-28 International Rectifier Corporation HID buck and full-bridge ballast control IC

Non-Patent Citations (1)

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Title
See references of WO2008037290A1 *

Also Published As

Publication number Publication date
CN101529991A (zh) 2009-09-09
AU2006348908A1 (en) 2008-04-03
CN101529991B (zh) 2012-11-21
WO2008037290A1 (fr) 2008-04-03
US8093836B2 (en) 2012-01-10
AU2006348908B2 (en) 2014-04-03
US20100045201A1 (en) 2010-02-25

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