EP2408272A2 - Agencement de commutation et procédé de fonctionnement d'au moins une lampe à décharge - Google Patents

Agencement de commutation et procédé de fonctionnement d'au moins une lampe à décharge Download PDF

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Publication number
EP2408272A2
EP2408272A2 EP11167573A EP11167573A EP2408272A2 EP 2408272 A2 EP2408272 A2 EP 2408272A2 EP 11167573 A EP11167573 A EP 11167573A EP 11167573 A EP11167573 A EP 11167573A EP 2408272 A2 EP2408272 A2 EP 2408272A2
Authority
EP
European Patent Office
Prior art keywords
discharge lamp
circuit arrangement
direct current
control device
arrangement according
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Withdrawn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
EP11167573A
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German (de)
English (en)
Inventor
Peter Krummel
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 EP2408272A2 publication Critical patent/EP2408272A2/fr
Withdrawn legal-status Critical Current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
    • H05B41/26—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
    • H05B41/298—Arrangements for protecting lamps or circuits against abnormal operating conditions
    • H05B41/2988—Arrangements for protecting lamps or circuits against abnormal operating conditions for protecting the lamp against abnormal operating conditions
    • 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
    • H05B41/39—Controlling the intensity of light continuously
    • H05B41/392—Controlling the intensity of light continuously using semiconductor devices, e.g. thyristor
    • H05B41/3921—Controlling the intensity of light continuously using semiconductor devices, e.g. thyristor with possibility of light intensity variations
    • 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
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S315/00—Electric lamp and discharge devices: systems
    • Y10S315/04—Dimming circuit for fluorescent lamps

Definitions

  • the present invention relates to a circuit arrangement for operating at least one discharge lamp having an input with a first and a second input terminal for coupling to a DC supply voltage, a bridge circuit having at least a first and a second electronic switch, wherein the first and the second electronic switch to form a first bridge center of the bridge circuit is serially coupled between the first and second input terminals, and at least one coupling capacitor, first and second output terminals for coupling to the overhead filament of the discharge lamp, third and fourth output terminals for coupling to the low-lying filament of the discharge lamp, a lamp inductor serially coupled between the first bridge center and one of the output terminals for the overhead filament of the discharge lamp, and a DC power source connected to the lamp Discharge lamp is coupled. It also relates to a corresponding method for operating at least one discharge lamp on such a circuit arrangement.
  • the present invention relates to a problem in the operation of discharge lamps with dimmable electronic Ballasts occurs. It comes with some dimming positions to so-called disk discharges. It is a known and common solution to suppress these disk discharges by feeding a direct current into the discharge lamp.
  • the object of the present invention is to develop a circuit arrangement or a method of the type mentioned in such a way that even at low dimming positions and low ambient temperatures on the one hand disk discharges, on the other hand own flicker of the discharge lamp can be prevented as much as possible.
  • the present invention is based on the finding that although the supply of a direct current effectively prevents the disk discharges, however, exactly this direct current at low dimming positions and low ambient temperatures is the cause of the intrinsic flicker. According to the invention, therefore, to prevent self-flickering at low dimming positions and low ambient temperatures, the DC current fed into the discharge lamp is suitably reduced or eliminated altogether.
  • This procedure stabilizes the gas discharge and largely prevents the intrinsic flicker.
  • a circuit arrangement therefore further comprises at least one sensor device for detecting at least one operating parameter of the discharge lamp and a control device which is coupled to the at least one sensor device and the DC power source, wherein the control device is designed to control the amplitude of the direct current output by the DC power source as a function of the at least one sensor device detected to vary at least one operating parameter.
  • a preferred embodiment is characterized in that the circuit arrangement further comprises a dimming factor supply device, which is designed to provide at its output a signal which with a Dimming factor of the circuit arrangement is correlated, wherein the dimming factor supply device is coupled to the control device, wherein the control device is designed to vary the amplitude of the output from the DC power source in dependence of the dimming factor.
  • a dimming factor of 20% means that the discharge lamp emits only 20% of the light that it would deliver under full load operation.
  • the control device is designed to vary the amplitude of the DC current output from the DC power only when the dimming factor is within a predeterminable range. In other words, therefore, with dimming factors above approximately 20%, no reduction of the direct current supplied to the discharge lamp to avoid disk discharges is undertaken.
  • a direct current with a predeterminable amplitude is fed into the discharge lamp and the supply of a direct current is completely omitted below this dimming factor.
  • the control device is designed to vary the amplitude of the direct current output by the DC power source as a function of the dimming factor to different degrees. In other words, within the critical dimming factor range, from high to low dimming factors, the direct current supplied to the discharge lamp is accordingly lowered continuously.
  • the DC power source is coupled between the first input terminal and one of the output terminals for the low-level filament of the discharge lamp.
  • the coupling capacitor is pre-charged. Accordingly, the direct current flows from the cold, that is low-lying helix to the hot, ie high-lying helix and from there via the lamp choke and the low-lying electronic switch to ground.
  • the DC power source may also be coupled between one of the output terminals for the low-lying filament of the discharge lamp and a reference potential, in particular the second input terminal. If the coupling capacitor is thus coupled between one of the output terminals for the low-lying filament of the discharge lamp and the reference potential, the DC source is quasi-parallel connected to this coupling capacitor. The current also flows from the DC power source to the cold filament, from there via the gas discharge to the hot filament and then via the lamp inductor and the low-lying switch of the bridge circuit to the reference potential.
  • the DC source can be realized by adjusting the duty cycle of the signals driving the switches of the bridge circuit.
  • a direct component can thus be generated and fed as direct current into the discharge lamp.
  • This variant has the advantage that it can be dispensed with the realization of an additional DC power source, the supply of a direct current to the discharge lamp can be achieved substantially by already existing components.
  • the sensor device is a temperature sensor.
  • the temperature sensor is preferably arranged in such a way to the discharge lamp, that by means of the temperature sensor, a temperature is measured, which is correlated with the temperature of the discharge lamp.
  • the temperature sensor is arranged such that it can measure the temperature on the tube wall of the discharge lamp.
  • control device is designed to control the DC source in such a way that the amplitude of the DC current output by the DC power source is varied in accordance with a predeterminable characteristic curve stored in the control device as a function of the temperature.
  • a predeterminable characteristic curve stored in the control device as a function of the temperature.
  • the characteristic curve can be designed in such a way that the control device activates the DC current source in such a way that it outputs a direct current of a predefinable amplitude at a temperature equal to or greater than a predefinable threshold value, and does not deliver direct current at a temperature below the predefinable threshold value.
  • the characteristic curve is designed in such a way that the control device controls the direct current source in such a way that the amplitude of the direct current emitted by it, in particular below a prescribable threshold value of the temperature, is substantially lower is reduced continuously or according to a plurality of stages as a function of the temperature.
  • the last-mentioned variant allows particularly precise avoidance of disc discharges on the one hand and avoidance of intrinsic flickering on the other hand.
  • the sensor device may be coupled to the at least one coupling capacitor, wherein the sensor device is designed to evaluate the voltage drop across the coupling capacitor during operation.
  • the coupling capacitor is arranged in the circuit arrangement.
  • the sensor device preferably comprises the series connection of a low-pass device, an alternating signal decoupling device and a rectifier.
  • the cutoff frequency of the low pass device is 200 to 300 Hz to reliably detect relevant alternating signal components that speak for a natural flicker of the discharge lamp in the frequency range between 20 and 150 Hz. Although this would possibly include a ripple in the network; However, this occurs only at high dimming levels. At low levels of dimming, where the intrinsic flicker occurs, the hum is negligible. This procedure is based on the knowledge that the intrinsic flickering of the discharge lamp is detected by the evaluation of the voltage at the coupling capacitor can. As soon as the discharge lamp flickers, a superimposed AC voltage of low frequency occurs at the coupling capacitor. This superimposed AC voltage can be used to control, in particular even to control, the DC power source.
  • control device preferably comprises a control device having a first input and a second input, wherein the first input is coupled to the output of the rectifier and the second input is coupled to a comparison value providing device, wherein the comparison value providing device is designed at its output a comparison value, in particular in dependence the dimming factor to provide, wherein the control device is designed to control the DC power source such that the amplitude of the DC output from the DC power source is varied in response to the signal at the output of the control device. Nevertheless, the low level of mains hum, which changes as a function of the dimming position, can be taken into account by the comparison value.
  • the control device may comprise an I-controller.
  • This realization has the advantage that the DC current is lowered only in the case of discharge lamps which exhibit a natural flicker. For discharge lamps that show no intrinsic flicker, the DC current is maintained throughout the dimming and temperature range. However, only so much direct current is always fed into the discharge lamp until the superimposed alternating voltage corresponds to the predetermined comparison value. Thus, the control device always works at the stability limit.
  • the control device therefore comprises a two-position controller. This is designed so that increasing the amplitude of the DC current is characterized by a first time constant, and lowering the amplitude of the DC current by a second time constant, wherein the first time constant represents a multiple of the second time constant, wherein the first time constant by at least a factor 1,000, preferably at least a factor 10,000, is greater than the second time constant.
  • the direct current is quickly reduced, for example in the millisecond range, when a self-flicker is detected.
  • the DC current as long as slow, that is in the second to minute range, again increased until the own flicker just occurs again.
  • the advantage of this variant is that with such a control device, the discharge lamp only ever comes for a very short time in the state of intrinsic flicker and then operated for a long time in the flicker-free state.
  • the visual impression is therefore a quieter operation of the discharge lamp compared to the operation of the discharge lamp at the stability limit.
  • Fig. 1 shows a schematic representation of a first embodiment of a circuit arrangement according to the invention.
  • a DC supply voltage is applied, which can in particular represent the so-called intermediate circuit voltage U zw derived from an AC mains voltage.
  • the input terminals E1, E2 is coupled as part of an inverter, the series connection of a first Q1 and a second electronic switch Q2, wherein between the switches Q1, Q2, a first bridge center BM1 is formed.
  • a lamp inductor L Dr is coupled between the first bridge center BM1 and a first output terminal A1.
  • a second output terminal A2 is provided for the overhead filament W1 of a discharge lamp LL.
  • output connections A3, A4 are provided between the output terminal A3 and the reference potential, which in the present case represents the input terminal E2.
  • a coupling capacitor C HB is coupled between the output terminal A3 and the reference potential, which in the present case represents the input terminal E2.
  • a firing capacitor C z is coupled, which is designed to ignite the discharge lamp LL together with the lamp inductor L Dr.
  • a DC current source I DC which is fed from the intermediate circuit voltage U zw , provides at its output a current I, which the discharge lamp LL via the terminal A3 is supplied.
  • a temperature sensor S ⁇ is provided, which is coupled to a control device 10 for controlling the DC current source I DC .
  • the control device 10 is also coupled to a dimming factor supply device 12.
  • the dimming factor provision device 12 supplies a signal "on” to the control device 10 at low dimming factors, so that the latter causes the DC current source I DC at temperatures below a threshold value ⁇ 1, the current I emitted by it
  • the dimming factor providing device 12 further causes the control device 10 to supply a current I greater than zero via the terminal A3 into the discharge lamp LL.
  • a current I is supplied to prevent disc discharges.
  • the discharge lamp is further supplied with a current I, whereas at low dimming factors, in particular below a threshold value for the dimming factor, and when the temperature drops below the threshold value ⁇ 1, the current delivered by the DC source is set to zero.
  • the intrinsic flickering of the discharge lamp LL can be reliably prevented.
  • Fig. 2 illustrated embodiment is characterized in that the lowering of the current I output from the DC current I DC continuously occurs at low dimming levels to low temperatures, the means there is no binary transition as in the embodiment of Fig. 1 instead of.
  • the lower the temperature at the discharge lamp LL the less direct current I is supplied to the discharge lamp LL. This goes so far, until finally no direct current I more flows through the discharge lamp LL.
  • the lowering of the current I output at the DC current source I Dc is activated only when the brightness is very well dimmed. For larger dimming positions, however, this function is switched off and it always flows the maximum, optimized against disc discharge direct current I through the discharge lamp LL.
  • the DC current source I DC is arranged between the input terminal E1 and the coupling capacitor C HB .
  • it may also be arranged between the terminal A3 and the reference potential. It may also be coupled to port A4 instead of port A3.
  • the DC power source can also be realized by the pulse width ratio of the signals used to drive the switches Q1, Q2.
  • the intrinsic flickering of the discharge lamp LL is detected by evaluating the voltage drop across the coupling capacitor C HB .
  • a sensor device S EF evaluates the low-frequency AC voltage component resulting from the intrinsic flicker of the voltage drop across the coupling capacitor C HB .
  • the sensor device S EF comprises for this purpose a Low-pass device 14, an alternating signal extraction device 16 and a rectifier 18.
  • the control device 10 comprises a control device having a first and a second input. The first input is coupled to the output of the rectifier 18, the second input to the dimming signal providing device 12, which in the present case is designed as a comparison value providing device.
  • the comparison value providing device 12 provides at its output a comparison value as a function of the dimming factor. The smaller the dimming factor, the smaller the comparative value provided, and the greater the effect of self-flickering on the activity of the control loop.
  • the control device 10 is designed to control the DC current source I DC in such a way that the amplitude I of the direct current output by the DC current source I DC is varied as a function of the signal at the output of the regulating device 10.
  • the control device 10 is preferably designed as an I-controller. Whereby at the in Fig. 3 illustrated embodiment, therefore, the DC current I DC is lowered only when a natural flicker of the discharge lamp LL is detected. For discharge lamps that show no intrinsic flicker, the supply of a direct current I is maintained throughout the dimming and temperature range.
  • Fig. 4 illustrated embodiment corresponds substantially to in Fig. 3
  • the realization of a DC power source at the in Fig. 4 illustrated embodiment by adjusting the duty cycle of the switches Q1, Q2 of the bridge circuit driving signals is realized.
  • an ohmic resistor R DC is inserted between the first input terminal E1 and the coupling point of the terminal A3 with the coupling capacitor C HB . Furthermore, the control device 10, which comprises the I-controller, is coupled to a device 20 for setting the duty cycle of the signal driving the switches Q1, Q2.
  • the control device 10 equipped with a two-position controller. If a self-flickering of the discharge lamp occurs, the current I emitted by the DC current source I DC is reduced in the millisecond range until the sensor device S EF no longer detects intrinsic flickering. Subsequently, the DC current I DC output from the DC current source I is slowly increased, that is in the second to minute range, until the intrinsic flicker just reappears. This reoccurrence of the intrinsic flicker is detected by the sensor device S EF , and the DC current is quickly reduced again.

Landscapes

  • Circuit Arrangements For Discharge Lamps (AREA)
  • Discharge-Lamp Control Circuits And Pulse- Feed Circuits (AREA)
EP11167573A 2010-07-12 2011-05-26 Agencement de commutation et procédé de fonctionnement d'au moins une lampe à décharge Withdrawn EP2408272A2 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE201010031219 DE102010031219A1 (de) 2010-07-12 2010-07-12 Schaltungsanordnung und Verfahren zum Betreiben mindestens einer Entladungslampe

Publications (1)

Publication Number Publication Date
EP2408272A2 true EP2408272A2 (fr) 2012-01-18

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EP11167573A Withdrawn EP2408272A2 (fr) 2010-07-12 2011-05-26 Agencement de commutation et procédé de fonctionnement d'au moins une lampe à décharge

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US (1) US8878462B2 (fr)
EP (1) EP2408272A2 (fr)
CN (1) CN102333408B (fr)
DE (1) DE102010031219A1 (fr)

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US9491838B2 (en) * 2012-01-26 2016-11-08 Texas Instruments Incorporated LED matrix manager
US8779669B2 (en) * 2012-08-24 2014-07-15 Abl Ip Holding Llc Chaotic approach to control of lighting
US9706623B2 (en) 2012-08-24 2017-07-11 Abl Ip Holding Llc Learning capable control of chaotic lighting
US9727037B2 (en) 2012-08-24 2017-08-08 Abl Ip Holding Llc Environmental control using a chaotic function
DE102013216877A1 (de) 2013-08-23 2015-02-26 Osram Gmbh Getakteter elektronischer Energiewandler

Family Cites Families (8)

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Publication number Priority date Publication date Assignee Title
US5170099A (en) * 1989-03-28 1992-12-08 Matsushita Electric Works, Ltd. Discharge lamp lighting device
ES2049790T3 (es) 1989-10-09 1994-05-01 Siemens Ag Adaptador electronico.
EP0713352B1 (fr) * 1994-11-18 2001-10-17 Matsushita Electric Industrial Co., Ltd. Appareil d'éclairage à lampe à décharge
DE19509832A1 (de) 1995-03-17 1996-09-19 Patent Treuhand Ges Fuer Elektrische Gluehlampen Mbh Verfahren und Schaltungsanordnung zum Betrieb einer Entladungslampe
US5914572A (en) * 1997-06-19 1999-06-22 Matsushita Electric Works, Ltd. Discharge lamp driving circuit having resonant circuit defining two resonance modes
US20030011326A1 (en) * 2001-07-13 2003-01-16 Noh Shi Youl Fluorescent lamp brightness controller
JP4608470B2 (ja) * 2006-08-31 2011-01-12 パナソニック電工株式会社 放電灯点灯装置、及び照明装置
DE102006043155A1 (de) * 2006-09-14 2008-03-27 Tridonicatco Gmbh & Co. Kg Elektronisches Vorschaltgerät mit asymmetrischer Wechselrichter-Ansteuerung

Non-Patent Citations (1)

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Also Published As

Publication number Publication date
CN102333408B (zh) 2016-05-25
DE102010031219A1 (de) 2012-01-12
US20120007515A1 (en) 2012-01-12
CN102333408A (zh) 2012-01-25
US8878462B2 (en) 2014-11-04

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