EP1148768B1 - Stabilisierung des Betriebs von Gasentladungslampen - Google Patents

Stabilisierung des Betriebs von Gasentladungslampen Download PDF

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Publication number
EP1148768B1
EP1148768B1 EP01105175A EP01105175A EP1148768B1 EP 1148768 B1 EP1148768 B1 EP 1148768B1 EP 01105175 A EP01105175 A EP 01105175A EP 01105175 A EP01105175 A EP 01105175A EP 1148768 B1 EP1148768 B1 EP 1148768B1
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EP
European Patent Office
Prior art keywords
lamp
lamp current
control
measure
current
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.)
Expired - Lifetime
Application number
EP01105175A
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German (de)
English (en)
French (fr)
Other versions
EP1148768A2 (de
EP1148768A3 (de
Inventor
Wolfram Dr. Graser
Andreas Huber
Josef Osterried
Alwin Veser
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
Patent Treuhand Gesellschaft fuer Elektrische Gluehlampen mbH
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.)
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Publication date
Application filed by Patent Treuhand Gesellschaft fuer Elektrische Gluehlampen mbH filed Critical Patent Treuhand Gesellschaft fuer Elektrische Gluehlampen mbH
Publication of EP1148768A2 publication Critical patent/EP1148768A2/de
Publication of EP1148768A3 publication Critical patent/EP1148768A3/de
Application granted granted Critical
Publication of EP1148768B1 publication Critical patent/EP1148768B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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    • 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

Definitions

  • the invention relates to a ballast for the operation of gas discharge lamps according to claim 1.
  • a gas discharge lamp also called lamp in the following
  • a gas discharge lamp also called lamp in the following
  • Anode sets the discharge over a large area over the electrode, while At the cathode usually forms a so-called. Burn spot (hotspot), whereby the discharge rather punctiform attaches.
  • the point at which the focal spot attaches depends on the electrode geometry, the Electrode material and the temperature distribution on the electrode. These Parameters are subject to changes during operation, so the starting point of the focal spot can change its position, resulting in a Instability of the gas discharge (arc disturbance) or flicker expresses.
  • this flickering occurs since one electrode alternately forms the cathode and anode and therefore itself to rebuild the focal spot with each change from the anode to the cathode got to.
  • the so-called rectangular operation the lamp known. It has been proven that it is for stability the AC operation of high-pressure gas discharge lamps advantageous is, instead of a sinusoidal lamp current to a rectangular choose. Normal values for the frequencies of the square wave are at 50Hz to 200Hz. Especially for applications in the image and projection technology, where the constancy of luminous flux is important the rectangular operation prevailed. Thus the period of time in which the Luminous flux does not correspond to the square-wave amplitude, as short as possible, the aim is to achieve the fastest possible commutation.
  • the load circuit of an arrangement for operating a discharge lamp contains, inter alia, energy storage, which can also be parasitic and the lamp, which is a non-linear one Load represents.
  • the network of energy stores emits resonance frequencies that can be excited by the non-linear load. Especially during operation Short arc high pressure lamps cause long lasting transients after commutation of the lamp current in rectangular operation. Of course, these vibrations can also be observed in the luminous flux. For applications requiring high luminous flux constancy (e.g., video projection), therefore, care must be taken that the period of time in which transients occur is small compared to Period of the square wave. Substantial influence on the duration of the transient response has the used in the relevant control gear Controller. In conventional control gear for the said applications is generated a size that represents a measure of the lamp power and compared with a reference measure. The result of this comparison provides the Control value for the power section of the control gear.
  • the settling time for a rectangular-mode light source can be defined by time which elapses, from commutation to the time when the Luminous flux levels in a range of +/- 5% around the setpoint Has. For conventional controllers described above, this settling time is 250 ⁇ s-300 ⁇ s. Since the settling time is at most 10% of a half-period should be the square wave, are therefore conventional Regulator frequencies for the Recheckschwingung of at most 200 Hz feasible.
  • the document WO-A-98 39 949 is a control device for gas discharge lamps with a cascade control, wherein an external software power control loop Current setpoints for an internal hardware power control loop pretends.
  • EP-A-422 255 is a control device for gas discharge lamps known, wherein the current setpoint consists of two sizes, of which one is a constant value and the other a measure of the lamp voltage is. This control device should prevent tearing off the discharge.
  • EP-A-482 705 is a control device for gas discharge lamps known, with rapid power changes in the control loop be taken into account by means of a differential compensation.
  • the object of the present invention is to provide a high-pressure Short arc discharge lamps provide a nearly flicker-free Operation of these lamps allowed.
  • the flicker-free operation is first applied to a lamp copy or was the lamp operated in the meantime by another method, so it may for short, despite the application of the flicker-free operation Time to come to flicker after the lamp is put into operation. reason for this is an electrode structure, which is a rapid training of Burning spots favored at different positions.
  • the application of the Flicker-free operation causes a shaping of the electrodes, the one exerting stabilizing influence on the discharge arc. Thus comes in almost flicker-free operation after a short time.
  • an output voltage UA is usually generated from a constant, so-called intermediate circuit voltage U0 with the aid of a clocked DC / DC converter. It is a DC voltage that can be adjusted by a manipulated variable Us .
  • the DC / DC converters may be different types, such as up, down, or inverters.
  • the manipulated variable Us causes in these converters a variation of the duty cycle of the circuit breaker contained in the transducers.
  • the rectangular operation of the lamp is usually realized in that the output voltage UA is reversed by means of a full-bridge circuit with the desired frequency for the square wave.
  • the control variable of the control gear is the power of the lamp ( Pist ) .
  • the input power of the DC / DC converter can also be used as a controlled variable.
  • Pist is compared with a desired value Psoll and determined therefrom without the aid of further measured variables directly or after the weighting by a control characteristic (P, PI, I, PID) the manipulated variable Us .
  • P, PI, I, PID control characteristic
  • the problem is solved by two measures: cascade control and feedforward control.
  • the cascade control as it is in principle also used in the so-called.
  • Current Mode in switched-mode power supplies is realized in the operating device according to the invention that the evaluated control difference from Pist and Psoll does not set the control value Us , but defines a target value for the lamp current Isoll .
  • Isoll is compared with the value Iact , which is a measure of the lamp current , and only this comparison result sets the manipulated variable Us directly or after the weighting by a control characteristic (P, PI, PID).
  • the disturbance variable connection is realized in the operating device according to the invention as follows:
  • the output voltage UA which is to be measured at the lamp terminals, is decisive for the lamp power.
  • Isoll is not only determined by the control difference of Pist and Psoll , but also made dependent on the output voltage UA . This can also be done by means of a weighting by a control characteristic, wherein preferably a differentiating characteristic is chosen in order to emphasize the fluctuations of UA .
  • FIG. 1 shows the discharge of a short-arc high pressure lamp immediately before the commutation of the lamp current. To recognize is the trained Focal spot. Such a discharge is not in accordance with the teachings of the present invention Invention and therefore tends to flicker phenomena.
  • FIG. 3 shows a block diagram of a controller structure according to the invention. Since the lamp power is to be controlled in a higher-level control loop, first the control difference from Pist and Psoll is formed in a first subtraction point S1 and evaluated with a control characteristic RC1.
  • the control characteristic RC1 can be a P, PI, I, or PID characteristic.
  • the evaluated signal is supplied to a second subtraction point S2.
  • the output voltage UA evaluated with the control characteristic RC2 is subtracted.
  • the control characteristic RC2 is embodied in a preferred differential characteristic (DT1) in FIG. 3, but may in principle also have a different characteristic (eg P, PI, I, or PID).
  • DT1 preferred differential characteristic
  • the feedforward control executed in the description part is realized.
  • the output of the second subtraction point S2 represents the nominal value Isoll of the inner control loop of the cascade control executed in the description part.
  • Isoll is compared in the third subtraction point S3 with a value which corresponds to the value of the lamp current .
  • the result of this comparison becomes the manipulated variable Us after the weighting with a control characteristic RC3.
  • the control characteristic RC3 can be a P, PI, or PID characteristic.
  • Fig. 4 shows a circuit in which the control structure shown in Fig. 3 is realized.
  • devices denoted by an R followed by a number are resistors, in the case of devices denoted by a C followed by a number, capacitors, and by devices denoted by a T followed by a number are to transistors.
  • the central component is the Current Mode Controller UCC3800 available from Unitrode .
  • This IC contains the first (S1) and third (S3) subtraction points, possibilities for determining the control characteristic RC3, and a circuit which generates the manipulated variable Us as a clocked signal for driving the circuit breaker of the DC / DC converter mentioned in the descriptive part.
  • this power switch is a MOSFET whose time it is turned on is varied by its signal at the gate. This signal is available on the UCC3800 at pin 6 (OUT). To generate the signal an internal oscillator is needed. Through R108 and C103, the frequency of the oscillator can be adjusted if it is free running. In this case, the DC / DC converter operates in so-called continuous mode.
  • R108 and C103 are connected in series. The junction is connected to PIN 8 (REF) and a reference voltage of 5V. The other end of R108 is connected to PIN 4 (RC), the other end of C103 is connected to ground.
  • the DC / DC converter by means of a circuit part which includes the components C6, R1, R2, R107, T100, R106, C101, R105, D102, R104 and C102, in transferred to the Discontinuous Mode .
  • This circuit part is controlled by the voltage at the drain of the above mentioned MOSFET. Between the drain and the operating voltage of 10.5V is the series connection of C6, R1, R2 and R107.
  • the resistor R107 is connected to one terminal at the same time at the operating voltage and the emitter of T100.
  • the other connector is connected to the base of T100.
  • the collector of T100 is R106 and C101.
  • the other terminal of R106 is grounded, the other terminal of C101 is connected to R105 and to the anode of D102.
  • the other terminal of R105 is grounded, the cathode of D102 is connected to R104 and C102.
  • the other terminal of R104 is grounded, the other terminal of C102 is connected to pin 4 (RC) of the UCC3800 .
  • the UCC3800 is connected to an operating voltage (10.5V) and ground. Via pin 8 (REF) Psoll is fed; in this case a reference voltage of 5V.
  • the circuit part comprising the components R11, R28, R29, R31, R117, R24, R25, IC11-B, R101, C13, C12, R20, R22 and IC11-A serves to provide the pist .
  • IC11-A and IC11-B are operational amplifiers.
  • the circuit part supplies to the output of IC11-A (Pin1) a voltage that is proportional to the input power of the DC / DC converter.
  • the intermediate circuit voltage U0 via the terminal UA1 is an inverting amplifier, the components R11, R28, R25, R24 and IC11-B contains fed.
  • R11 and R28 form a voltage divider between UA1 and ground.
  • the signal at the junction of R11 and R28 is applied to the inverting input of IC11-B (Pin6).
  • the non-inverting input of IC11-B (Pin5) is connected to a reference voltage of 2.5V.
  • the feedback resistor R25 Between the output of IC11-B (pin4) and the inverting input of IC11-B is the feedback resistor R25.
  • the output of IC11-B is connected through the series circuit of R24 and R101 to the inverting input of IC11-A (Pin2).
  • R24 and R101 With the junction of R24 and R101 are the resistors R31, R29 and R117.
  • the other connector of R29 is ground, the other one Connection of R117 is connected to the reference voltage of 5V and the other terminal of R31 leads to the terminal Poti.
  • On the Connection Poti can be connected to ground and a potentiometer the lamp power can be adjusted.
  • the components R101, R22, C13, R20, C12 and IC11-A form an adder in FIG the amplified voltage signal UA1 and via the source supplied signal, which is a measure of the input current, is added.
  • the signal from the source terminal is via R22 the non-inverting Input from IC11-A (pin3) supplied.
  • C13 is between the non-inverting Input from IC11-A and ground.
  • Between the inverting input of IC11-A and the output of IC11-A is the series connection from C12 and R20.
  • the addition represents an approximation of the multiplication in the operating point, whereby a signal is present at pin 1 of IC11-A whose voltage value is a measure of the input power of the DC / DC converter. With the aid of C12, the adder simultaneously generates the control characteristic RC1, in this case a PI characteristic. At Pin 1 of IC11-A a weighted Pist signal is available.
  • the input current for which the signal supplied via the terminal source is a measure, is at the same time a measure of the lamp current Iist .
  • the outer control loop of the cascade control is closed via R112, which connects the output of IC11-A and Pin 2 (FB) of the UCC3800 .
  • the pin 2 (FB) of the UCC3800 simultaneously represents the signal Isoll and the second subtraction point S2.
  • the output UA of the DC / DC converter is connected to the terminal UA.
  • Via the series connection of C100 and R111 it is supplied to pin 2 (FB) of the UCC3800, thus realizing the described disturbance variable connection.
  • C100 and R111 form the control characteristic RC2; in this case a DT1 characteristic.
  • control characteristic RC3 can be determined; in this case a PI characteristic.
  • bracketed pin designations of the UCC3800 refer to the data sheet of the manufacturer, the company UNITRODE, Merrimack, USA.

Landscapes

  • Circuit Arrangements For Discharge Lamps (AREA)
  • Non-Portable Lighting Devices Or Systems Thereof (AREA)
EP01105175A 2000-04-14 2001-03-02 Stabilisierung des Betriebs von Gasentladungslampen Expired - Lifetime EP1148768B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE10018860A DE10018860A1 (de) 2000-04-14 2000-04-14 Stabilisierung des Betriebs von Gasentladungslampen
DE10018860 2000-04-14

Publications (3)

Publication Number Publication Date
EP1148768A2 EP1148768A2 (de) 2001-10-24
EP1148768A3 EP1148768A3 (de) 2004-01-28
EP1148768B1 true EP1148768B1 (de) 2005-09-07

Family

ID=7638962

Family Applications (1)

Application Number Title Priority Date Filing Date
EP01105175A Expired - Lifetime EP1148768B1 (de) 2000-04-14 2001-03-02 Stabilisierung des Betriebs von Gasentladungslampen

Country Status (9)

Country Link
US (1) US6525491B2 (ja)
EP (1) EP1148768B1 (ja)
JP (1) JP4593821B2 (ja)
KR (1) KR100710935B1 (ja)
CN (1) CN1242652C (ja)
AT (1) ATE304280T1 (ja)
CA (1) CA2344052A1 (ja)
DE (2) DE10018860A1 (ja)
TW (1) TW492266B (ja)

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JP4496514B2 (ja) * 2001-07-06 2010-07-07 株式会社デンソー 放電灯装置
US7507412B2 (en) * 2001-07-18 2009-03-24 Merck Patent Gmbh Glycoprotein VI fusion proteins
DE10200046A1 (de) * 2002-01-02 2003-07-17 Patent Treuhand Ges Fuer Elektrische Gluehlampen Mbh Betriebsgerät für Hochdruck-Entladungslampen
TW200401586A (en) * 2002-05-17 2004-01-16 Koninkl Philips Electronics Nv Projection system
CN1950747A (zh) * 2004-05-05 2007-04-18 图象公司 多源高性能立体投影系统
EP1776848B1 (en) * 2004-08-06 2008-09-03 Philips Intellectual Property & Standards GmbH Method and circuit arrangement for operating a discharge lamp
US7911159B2 (en) * 2004-10-29 2011-03-22 Koninklijke Philips Electronics N.V. Robust driver for high intensity discharge lamp
EP1867216A1 (en) 2005-03-22 2007-12-19 Lightech Electronic Industries Ltd. Igniter circuit for an hid lamp
EP1905280A1 (en) * 2005-06-30 2008-04-02 Philips Intellectual Property & Standards GmbH Method of driving a discharge lamp in a projection system, and driving unit
JP5106788B2 (ja) * 2006-05-29 2012-12-26 株式会社小糸製作所 放電灯点灯回路
KR101339067B1 (ko) 2006-12-18 2013-12-09 오스람 게엠베하 고압 방전 램프를 동작시키기 위한 회로 어레인지먼트 및 방법
DE102007050633A1 (de) * 2007-10-23 2009-04-30 Osram Gesellschaft mit beschränkter Haftung Verfahren und Vorrichtung zum Betreiben einer Gasentladungslampe
DE102009019229A1 (de) * 2009-04-28 2010-11-04 Tridonicatco Gmbh & Co. Kg Leistungsgeregelte Betriebsschaltung für ein Leuchtmittel sowie Verfahren zum Betreiben derselben

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NZ201203A (en) 1981-07-28 1985-08-30 Lee Electric Lighting Arc lamp supply:fet bridge inverter powered by constant current source
EP0422255B1 (de) * 1989-10-09 1994-03-02 Siemens Aktiengesellschaft Elektronisches Vorschaltgerät
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IL123029A (en) * 1998-01-22 2003-02-12 Jbp Technologies Ltd Method and device for operating electronic ballasts for high intensity discharge (hid) lamps
JP4213253B2 (ja) * 1998-05-28 2009-01-21 ハリソン東芝ライティング株式会社 高圧放電ランプ用点灯装置、高圧放電ランプ点灯装置、照明装置および車両
DE19829600A1 (de) * 1998-07-02 1999-09-23 Seufert Gmbh Dr Betriebsverfahren und elektronisches Vorschaltgerät für Hochdruck-Wechselspannungs-Entladungslampen
TWM266672U (en) * 1998-12-17 2005-06-01 Koninkl Philips Electronics Nv Circuit arrangement
US6215252B1 (en) * 1998-12-29 2001-04-10 Philips Electronics North America Corporation Method and apparatus for lamp control
JP3603643B2 (ja) * 1999-02-15 2004-12-22 松下電工株式会社 放電灯点灯装置
US6479946B2 (en) * 1999-03-05 2002-11-12 Matsushita Electric Industrial Co., Ltd. Method and system for driving high pressure mercury discharge lamp, and image projector
JP3802281B2 (ja) * 1999-06-21 2006-07-26 株式会社小糸製作所 放電灯点灯回路

Also Published As

Publication number Publication date
EP1148768A2 (de) 2001-10-24
US6525491B2 (en) 2003-02-25
KR20010098617A (ko) 2001-11-08
DE10018860A1 (de) 2001-10-18
CN1242652C (zh) 2006-02-15
CA2344052A1 (en) 2001-10-14
CN1325260A (zh) 2001-12-05
DE50107326D1 (de) 2005-10-13
US20010030515A1 (en) 2001-10-18
KR100710935B1 (ko) 2007-04-24
ATE304280T1 (de) 2005-09-15
TW492266B (en) 2002-06-21
JP2001351793A (ja) 2001-12-21
EP1148768A3 (de) 2004-01-28
JP4593821B2 (ja) 2010-12-08

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