EP0893943B1 - Onduleur à fréquence graduellement variable pour alimenter une lampe à décharge - Google Patents

Onduleur à fréquence graduellement variable pour alimenter une lampe à décharge Download PDF

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Publication number
EP0893943B1
EP0893943B1 EP97202310A EP97202310A EP0893943B1 EP 0893943 B1 EP0893943 B1 EP 0893943B1 EP 97202310 A EP97202310 A EP 97202310A EP 97202310 A EP97202310 A EP 97202310A EP 0893943 B1 EP0893943 B1 EP 0893943B1
Authority
EP
European Patent Office
Prior art keywords
frequency
inverter
bridge circuit
generated
frequencies
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
EP97202310A
Other languages
German (de)
English (en)
Other versions
EP0893943A1 (fr
Inventor
Paul Jos Luc Van Tichelen
Dominique Weyen
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.)
F Verdeyen Nv
Original Assignee
F Verdeyen Nv
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 F Verdeyen Nv filed Critical F Verdeyen Nv
Priority to DE69735257T priority Critical patent/DE69735257T2/de
Priority to EP97202310A priority patent/EP0893943B1/fr
Priority to AT97202310T priority patent/ATE318068T1/de
Publication of EP0893943A1 publication Critical patent/EP0893943A1/fr
Application granted granted Critical
Publication of EP0893943B1 publication Critical patent/EP0893943B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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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
    • H05B41/26—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 an inverter for feeding a gas discharge lamp, comprising:
  • the above mentioned literature reference therefore teaches choosing the power supply frequency of the gas discharge lamp such that at the chosen frequency acoustic resonance is prevented. Once a frequency has been chosen the inverter will continue to operate at the said frequency.
  • a selection procedure is run during start-up of the lamp. Use is made herein of a parameter of the lamp to be monitored outside the lamp, such as light output and the like, which is used as indicator for the occurrence of acoustic resoance. If this parameter gives an indication for the occurrence of acoustic resonance a following frequency is chosen. After a time this procedure is completed and the feed of the lamp is retained with the chosen frequency wherein no resonance occurs.
  • the circuit known from the first literature reference has the drawback that in the course of time, for instance due to thermal phenomena, the properties of the lamp change so that, at a determined power supply frequency wherein initially no acoustic resonance occurred, acoustic resonance can begin to occur after a period of time. This could result in the above stated drawbacks.
  • EP-A-0 397 334 discloses a inverter for feeding a gas discharge lamp, comprising:
  • the object of the present invention is therefore to provide such a circuit, wherein the power frequency-spectrum is more evenly distributed.
  • the present invention according to claim 1 provides the feature that the time duration for which a signal of a determined frequency is generated depends on the value of the frequency, and that the time duration for which a high frequency is generated is longer than the time duration wherein a low frequency is generated.
  • an inverter 1 which is fed by a direct voltage source 2.
  • a direct voltage source 2 is formed for instance by a rectifier, for instance a controllable rectifier which rectifies alternating voltage coming from an alternating voltage mains supply. It is otherwise also possible to make use of a direct voltage mains supply.
  • the actual inverter 1 comprises four switch elements 3,4,5,6 which are connected in the form of a bridge.
  • the switch elements are each formed by bipolar transistors. It will be apparent that it is possible to apply other switch elements such as FETs or other elements designed from semiconductor configurations.
  • a freewheel diode 12 is connected in parallel to each of these elements.
  • the lamp circuit is connected to the output terminals 7,8.
  • the lamp circuit is formed by a ballast 9 and by a gas discharge lamp 10.
  • a control circuit 11 is arranged for controlling switch elements 3,4,5,6.
  • the control circuit is formed essentially by for instance a microprocessor which is provided with a suitable drive circuit for driving the control electrodes of the switch elements. Use is preferably made of a micro-controller provided with a sequence counter.
  • the control herein is such that the frequency of the signal generated at the output terminals 7,8 is independent of the impedance connected thereto.
  • the ballast coil 9 does not therefore form an implicit part of the oscillator circuit.
  • control circuit 11 can fully determine the frequency of the output signal.
  • the frequency is herein determined such that it varies stepwise at discrete time intervals.
  • Such a configuration is shown for instance in figure 2.
  • the frequency of the oscillator circuit is chosen at F 1 , from point in time t 1 to t 2 at F 4 , from t 2 to t 3 at F 2 and so on.
  • the starting point is six separate frequencies which are stored for instance in the memory of control circuit 11.
  • a frequency following a first frequency is always chosen which is separated by at least one other frequency.
  • the successive frequencies are thus located relatively far away from each other. Achieved herewith is that if acoustic resonance were to occur at a random frequency the following frequency is located so far away therefrom that it is certain no acoustic resonance will occur at the following frequency.
  • time durations i.e. the time durations between the points in time t 0 , t 1 , t 2 and so on are always the same.
  • the time durations for which a frequency is generated are proportional to the frequency.
  • the frequency between two successive points in time is modulated to a very slight extent.
  • the danger of acoustic resonance is herein reduced still further.
  • the adjustable voltage source is supplied by an alternating voltage source 25 and comprises a mains filter 26, a rectifier 27 and a controllable control element, for instance a FET 12, a smoothing choke 13, a diode 14 and a current measuring resistor 15.
  • a control circuit 16 is arranged for control. This can be combined with the control circuit 4 of the foregoing embodiments.
  • control circuits are per se known, for instance as the commercially available circuit MSC 60028.
  • Control circuit 16 is connected to both sides of the current measuring resistor 15. Control circuit 16 is further connected by means of a controllable feedback network 18 to the output terminals.
  • Feedback network 18 comprises a resistance divider comprising two resistors 19,20 and a controllable attenuation network which is connected in parallel to the second resistor 20 and which is formed in the present embodiment by a parallel circuit of four series connections of a resistor 21 and an electronic switch 22.
  • resistors 19,20,21 are of course chosen so that the output voltage of the circuit can be varied in the vicinity of the nominal voltage, for instance between 350 V and 450 V.

Landscapes

  • Circuit Arrangements For Discharge Lamps (AREA)

Claims (9)

  1. Convertisseur (1) pour l'alimentation d'une lampe à décharge à gaz (10), comprenant :
    - une source de tension directe (2) ;
    - au moins deux éléments de commutation (3-6) incorporés dans un circuit en pont ;
    - un circuit de commande (11) pour commander les éléments de commutation de telle sorte que le circuit en pont génère de façon continue une tension alternative ;
    - au moins une inductance ballast (9) connectée à l'un des terminaux de sortie (7, 8) du circuit en pont ; et
    - au moins une lampe à décharge à gaz (10) connectée entre l'inductance ballast (9) et l'autre terminal de sortie (7) du circuit en pont,
    - dans lequel le circuit de commande (11) est adapté pour appliquer au niveau de ses terminaux de sortie un signal de commande aux éléments de commutation (3-6) du circuit en pont, de telle sorte que la tension alternative générée par le circuit en pont change progressivement de fréquence entre au moins trois fréquences, caractérisé en ce que la durée pendant laquelle un signal d'une fréquence déterminée est généré dépend de la valeur de la fréquence, et en ce que la durée pendant laquelle une haute fréquence est générée est supérieure à la durée pendant laquelle une basse fréquence est générée.
  2. Convertisseur (1) selon l'une quelconque des revendications précédentes, caractérisé en ce que la fréquence de la tension alternative générée est légèrement modulée dans une durée avec une fréquence essentiellement constante, dans lequel le changement de fréquence est inférieur à la différence entre les fréquences générées pendant différentes durées.
  3. Convertisseur (1) selon l'une quelconque des revendications précédentes, caractérisé en ce que les fréquences générées sont sélectionnées parmi une collection de fréquences discrètes et en ce que les fréquences se suivant les unes les autres dans le temps sont séparées par au moins une fréquence intermédiaire.
  4. Convertisseur (1) selon l'une quelconque des revendications précédentes, caractérisé en ce que la tension générée par la source de tension directe (2) est réglable.
  5. Convertisseur (1) selon la revendication 4, caractérisé en ce que la source de tension directe comprend un circuit de régulation alimenté par la tension de sortie du circuit via un réseau de rétroaction commandable.
  6. Convertisseur (1) selon la revendication 4 ou 5, caractérisé en ce que la tension générée par la source de tension (2) est commandée pour le réglage de la puissance fournie à la lampe.
  7. Convertisseur (1) selon l'une quelconque des revendications précédentes, caractérisé en ce que le circuit de commande (11) est commandable à distance.
  8. Convertisseur (1) selon l'une quelconque des revendications précédentes, caractérisé en ce que le circuit de commande (11) est adapté pour commander la fréquence et la durée de la fréquence du circuit en pont (3-6) afin de régler avec ceci la puissance fournie à la lampe (10).
  9. Convertisseur (1) selon la revendication 5, 6 ou 7, caractérisé en ce que le circuit de commande (11) est adapté pour sélectionner les fréquences lors de la phase de mise en marche de la lampe (10), de telle sorte que la lampe (10) est mise en marche de façon optimale.
EP97202310A 1997-07-24 1997-07-24 Onduleur à fréquence graduellement variable pour alimenter une lampe à décharge Expired - Lifetime EP0893943B1 (fr)

Priority Applications (3)

Application Number Priority Date Filing Date Title
DE69735257T DE69735257T2 (de) 1997-07-24 1997-07-24 Wechselrichter zur Versorgung einer Entladungslampe mit sprunghaft veränderlicher Frequenz
EP97202310A EP0893943B1 (fr) 1997-07-24 1997-07-24 Onduleur à fréquence graduellement variable pour alimenter une lampe à décharge
AT97202310T ATE318068T1 (de) 1997-07-24 1997-07-24 Wechselrichter zur versorgung einer entladungslampe mit sprunghaft veränderlicher frequenz

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP97202310A EP0893943B1 (fr) 1997-07-24 1997-07-24 Onduleur à fréquence graduellement variable pour alimenter une lampe à décharge

Publications (2)

Publication Number Publication Date
EP0893943A1 EP0893943A1 (fr) 1999-01-27
EP0893943B1 true EP0893943B1 (fr) 2006-02-15

Family

ID=8228587

Family Applications (1)

Application Number Title Priority Date Filing Date
EP97202310A Expired - Lifetime EP0893943B1 (fr) 1997-07-24 1997-07-24 Onduleur à fréquence graduellement variable pour alimenter une lampe à décharge

Country Status (3)

Country Link
EP (1) EP0893943B1 (fr)
AT (1) ATE318068T1 (fr)
DE (1) DE69735257T2 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2009518818A (ja) * 2005-12-14 2009-05-07 オスラム ゲゼルシャフト ミット ベシュレンクテル ハフツング 高圧放電ランプを作動させるための回路装置および方法
CN102291907A (zh) * 2011-05-19 2011-12-21 安徽卓越电气有限公司 一种无极灯数字电子镇流器及其控制方法

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
ES2153314B1 (es) * 1999-02-17 2001-09-01 Univ Cantabria Sistema electronico de arranque suave y de optimizacion de la transferencia de energia para lamparas de descarga.
WO2003009652A1 (fr) * 2001-07-13 2003-01-30 Sunshower España, S.L. Ballast multicharge pour l'emission de rayonnements electromagnetiques a cablage simplifie
ES2169662B1 (es) * 2000-05-08 2003-11-01 Sunshower Espana S L Balasto multicarga para radiacion electromagnetica con cableado simplificado.
US6400100B1 (en) * 2000-07-20 2002-06-04 Philips Electronics North America Corporation System and method for determining the frequency of longitudinal mode required for color mixing in a discharge lamp
CN100469210C (zh) 2001-10-31 2009-03-11 皇家飞利浦电子股份有限公司 镇流电路
US6580231B1 (en) * 2001-12-05 2003-06-17 Koninklijke Philips Electronics N.V. Color mixing in HID lamp at VHF frequencies
CN100464616C (zh) * 2004-06-30 2009-02-25 哈尔滨工业大学 高压气体放电灯的数字电子镇流器及其数控方法

Family Cites Families (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4705991A (en) * 1981-06-04 1987-11-10 U.S. Philips Corporation Method of operating a high-pressure metal vapor discharge lamp and circuit arrangement for carrying out this method
US4523128A (en) * 1982-12-10 1985-06-11 Honeywell Inc. Remote control of dimmable electronic gas discharge lamp ballasts
GB8711131D0 (en) * 1987-05-12 1987-06-17 Emi Plc Thorn Power supply
GB8909484D0 (en) * 1989-04-26 1989-06-14 Emi Plc Thorn A method of operating an arc discharge lamp
DE4123187A1 (de) * 1991-07-12 1993-01-14 Tridonic Bauelemente Vorschaltgeraet zum pulsbetrieb von gasentladungslampen
AU3767493A (en) * 1992-03-25 1993-10-21 Toto Ltd. Power regulator of discharge lamp and variable color illumination apparatus using the regulator
JP3280475B2 (ja) * 1993-08-03 2002-05-13 池田デンソー株式会社 放電灯点灯装置
US5394064A (en) * 1993-10-15 1995-02-28 Micro-Technology Inc.-Wisconsin Electronic ballast circuit for fluorescent lamps
ATE261235T1 (de) * 1995-05-23 2004-03-15 Praezisa Ind Elektronik Verfahren bzw. vorrichtung zum betrieb einer hochdruckentladungslampe
JP3324386B2 (ja) * 1995-06-02 2002-09-17 株式会社デンソー 車両用放電灯制御装置

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2009518818A (ja) * 2005-12-14 2009-05-07 オスラム ゲゼルシャフト ミット ベシュレンクテル ハフツング 高圧放電ランプを作動させるための回路装置および方法
CN102291907A (zh) * 2011-05-19 2011-12-21 安徽卓越电气有限公司 一种无极灯数字电子镇流器及其控制方法

Also Published As

Publication number Publication date
EP0893943A1 (fr) 1999-01-27
DE69735257D1 (de) 2006-04-20
DE69735257T2 (de) 2006-11-16
ATE318068T1 (de) 2006-03-15

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