EP0677981B1 - Ballast, avec dispositif de reconnaissance de changement de lampe, pour tubes à décharge - Google Patents
Ballast, avec dispositif de reconnaissance de changement de lampe, pour tubes à décharge Download PDFInfo
- Publication number
- EP0677981B1 EP0677981B1 EP94105853A EP94105853A EP0677981B1 EP 0677981 B1 EP0677981 B1 EP 0677981B1 EP 94105853 A EP94105853 A EP 94105853A EP 94105853 A EP94105853 A EP 94105853A EP 0677981 B1 EP0677981 B1 EP 0677981B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- lamp
- inverter
- circuit
- transformer
- ballast
- 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
Links
- 238000005259 measurement Methods 0.000 claims abstract description 20
- 238000000034 method Methods 0.000 claims abstract description 14
- 238000010438 heat treatment Methods 0.000 claims abstract description 13
- 238000004804 winding Methods 0.000 claims 9
- 238000010304 firing Methods 0.000 abstract 1
- 238000001514 detection method Methods 0.000 description 14
- 238000012544 monitoring process Methods 0.000 description 5
- 238000010586 diagram Methods 0.000 description 4
- 239000003990 capacitor Substances 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 230000001939 inductive effect Effects 0.000 description 2
- 230000008878 coupling Effects 0.000 description 1
- 238000010168 coupling process Methods 0.000 description 1
- 238000005859 coupling reaction Methods 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 230000001960 triggered effect Effects 0.000 description 1
Images
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
- H05B41/295—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
- H05B41/2981—Arrangements for protecting lamps or circuits against abnormal operating conditions for protecting the circuit against abnormal operating conditions
- H05B41/2985—Arrangements for protecting lamps or circuits against abnormal operating conditions for protecting the circuit against abnormal operating conditions against abnormal lamp operating conditions
Definitions
- the invention relates to a ballast for a discharge lamp and on a method for Operation of such a ballast according to the generic terms of the independent claims. Such one The method and device are described in DE-A-34 32 266.
- EP 146 683 describes a ballast for Discharge lamps described in which the inverter is switched off when a lamp is permanently inoperative is. After this shutdown, a DC current passed through the lamp circuit. Because of this Current goes through a heating electrode of each lamp, it falls together as soon as a lamp is removed. So can a lamp change was determined by measuring this current so that after changing the lamp the Inverters are automatically switched on again can.
- this method has a disadvantage that it monitors only one of the electrodes of each lamp. It is also for circuits in which the heating currents are inductively coupled into the electrodes, only suitable to a limited extent.
- the inverter if possible operated at a frequency above the normal working frequency for the operation of the lamps lies and is therefore not sufficient to ignite them.
- FIG. 1 A first embodiment of the invention can be seen in FIG. 1.
- an inverter 1 operates in a known manner a lamp circuit which has a coupling capacitor C1, an inductor L, a lamp La with heating cathodes K1 and K2, a parallel capacitor C2 and a shunt resistor R.
- This switching technology is known to the person skilled in the art and need not be explained in more detail.
- a voltage U ILC is tapped across the resistor R which is proportional to the current in the lamp circuit. This voltage is fed to a control circuit 2.
- U ILC likewise in a manner known per se, is evaluated by a preheating controller 3 and a current limitation / ignition detection 4, which monitor the preheating current and the operating current of the lamps. In addition, it is fed to a lamp detection circuit 5.
- the control circuit 2 further comprises a control logic 6, a pulse generator 7 and an inverter control 8.
- the voltage U ILC is measured in the lamp detection 5.
- the voltage generated by the inverter 1 flows through C1, L, K1, C2, K2 and R in each measurement phase, which generates a voltage U ILC .
- the inverter no longer generates any current through R in the measurement phases, so U ILC remains zero. It can thus be determined by monitoring the voltage U ILC whether the lamp La has been removed from the lamp circuit. For this purpose, U ILC can be compared with a threshold value in the measurement phases. If U ILC is less than this threshold, the lamp is missing.
- control circuit 2 detects in this way that the lamp La has been removed, the measuring phases are continued. If a new lamp La is now used, U ILC rises again in the measurement phases. The lamp detection 5 thereby recognizes that a lamp has been inserted again, and the control logic 6 ends the measuring phases and initiates a new preheating and ignition process.
- the circuit according to FIG. 1 has the advantage that the circuit complexity is low in comparison with conventional circuits, since the voltage U ILC is required anyway for monitoring the lamp current and the preheating current, and therefore no new components are necessary here.
- the lamp detection circuit 5, the control logic 6 and the pulse generator 7 can, for. B. can be implemented as part of an integrated circuit so that they do not cause major additional costs.
- the inventive Switching also for ballasts with two lamps La, La 'can be used.
- Such circuits are used for Example the middle cathodes K2 and K1 'of the lamps in heated in a known manner via a 1: 1 transformer Tr.
- This circuit is also controlled in the same way, like that according to figure 1. one of the lamps does not ignite, so this can again be done in the current limitation / ignition detection 4 are determined, whereupon the control circuit 2 in regular intervals the inverters with a short Triggered pulse train to perform the measurement phases.
- the value of U ILC can again be measured during the measurement phases. If one of the lamps La, La 'is missing, the lack of the cathode K1 rsp. K2 'the lamp circuit is interrupted and the voltage U ILC becomes zero.
- a voltage U VCT can also be tapped from the lamp circuit in front of the transformer Tr. This voltage can be used to monitor whether K2 rsp. K1 'lie correctly in the lamp circle. If one of these cathodes is missing or damaged, the voltage across Tr and thus U VCT is higher during the measurement phases.
- the lamp detection 5 thus indicates a lack of the lamps when U ILC is less than a first threshold or (if used) U VCT is greater than a second threshold.
- the circuit according to FIG. 3 shows a ballast with only one lamp, the lower cathode K2 of which is heated inductively via the 1: 1 transformer Tr.
- a separate measurement of the lamp current (as voltage U IFL over R ') and the current through the heating cathodes (as voltage U ILC over R) can therefore take place here.
- the control circuit 2 is again designed essentially the same as in FIG. 1 and FIG. 2.
- the lamp current is regulated by supplying the voltage U IFL with a lamp current regulator 9.
- the current limitation / ignition detection 4, the preheating controller 3 and the lamp detection 5 are supplied with the voltage U ILC proportional to the current in the heating cathode K1.
- a voltage U VCT can be tapped above the transformer Tr. This voltage increases when K2 is interrupted or missing.
- the lamp detection 5 thus again indicates a lack of the lamps during the measurement phases when U ILC is less than a first threshold value or (if U VCT is also to be monitored) U VCT is greater than a second threshold value.
- FIG. 4 Another possible application of the invention results from FIG. 4.
- two lamps La, La ' are operated.
- the heating current for the lower cathode K2 'of the second lamp La' is also inductively coupled in via a second 1: 1 transformer Tr '.
- the lamp current is measured as a voltage drop U IFL over R ', the heating current as a voltage drop U ILC over R.
- U IFL is fed to the lamp current regulator, which regulates the maximum lamp current.
- U ILC is passed on the one hand to the current limitation / ignition detection 4, which monitors the maximum inverter current and the ignition of the lamps, on the other hand to the preheating controller 3, which regulates the preheating current, and is used in the lamp detection 5 as in the previous examples.
- the preheating controller 3 which regulates the preheating current, and is used in the lamp detection 5 as in the previous examples.
- the lamp detection 5 will in turn signal a lack of lamps during the measurement phases if U ILC is less than a first threshold value or U VCT is greater than a second threshold value.
Landscapes
- Circuit Arrangements For Discharge Lamps (AREA)
Claims (10)
- Procédé pour faire fonctionner un ballast pour lampes à décharge comprenant un inverseur (1) pour alimenter un circuit de lampe comportant au moins une lampe (La, La'), le procédé incluant une désactivation de l'inverseur (1) lorsqu'une ou plusieurs lampes (La, La') ne s'allument pas, un nouveau processus d'allumage ne débutant qu'après un échange de lampe, l'inverseur (1) étant au moins brièvement activé de façon répétée pendant des phases de mesure afin de détecter un changement de lampe, caractérisé en ce que l'on détecte si une lampe a été ôtée, respectivement mise en place, par la mesure d'une tension (UILC, UVCT) générée par l'inverseur dans le circuit de lampe.
- Procédé selon la revendication 1, caractérisé en ce qu'après un allumage manqué on détecte au moyen de phases de mesure répétées quand une lampe a été ôtée, qu'après qu'une lampe a été ôtée on détecte au moyen de phases de mesure répétées quand toutes les lampes sont de nouveau en place, et que le processus d'allumage est ensuite à nouveau mis en route.
- Procédé selon une des revendications précédentes, caractérisé en ce que le circuit de lampe comprend au moins deux lampes en série et que pendant les phases de mesure on détecte par la mesure de deux tensions (UILC, UVCT) générée par l'inverseur dans le circuit de lampes si une des lampes a été ôtée ou mise en place.
- Ballast pour lampes à décharge comportant un inverseur (1), un circuit de lampe alimenté pour l'inverseur (1) et comprenant au moins une lampe (La, La') ainsi qu'un circuit de contrôle (2) servant à contrôler si un allumage d'une ou de plusieurs lampes a réussi ainsi qu'à désactiver l'inverseur (1) dans le cas contraire, le circuit de contrôle (2) comportant un générateur de commande (6, 7) pour détecter un échange de lampe après un allumage manqué, l'inverseur (1) pouvant être activé au moins brièvement par le générateur de commande pendant des phases de mesure répétée, caractérisé par un circuit (5) de reconnaissance de lampe permettant de mesurer pendant les phases de mesure une tension (UILC, UVCT) produite par l'inverseur dans le circuit de lampe.
- Ballast selon la revendication 4, le circuit de lampe comportant des électrodes de chauffage (K1, K2, K1', K2'), caractérisé en ce qu'une résistance (R, R') est agencée en série avec une électrode de chauffage et que le circuit de reconnaissance de lampe (5) permet de mesurer une chute de tension à travers la résistance.
- Ballast selon une des revendications 4 ou 5, caractérisé par un premier tranformateur (Tr, Tr'), une première résistance (R) et une seconde résistance (R'), un bobinage secondaire du premier transformateur pouvant générer un courant de chauffage dans une électrode de chauffage (K2, K2') située du côté terre de la lampe, la première résistance (R) étant agencée en série avec un bobinage primaire du premier transformateur (Tr, Tr') et la seconde résistance (R') étant agencée entre l'électrode de chauffage (K2, K2') située du côté terre et la terre.
- Ballast selon la revendication 6, caractérisé en ce que la première résistance (R) est agencée entre le bobinage primaire du premier transformateur et la terre et que le circuit de reconnaissance de lampe (5) permet de mesurer une tension à travers la première résistance (R).
- Ballast selon une des revendications 7 ou 7, caractérisé en ce que le bobinage primaire du premier transformateur (Tr, Tr') est agencé en série avec une électrode de chauffage (K1) située du côté de l'inverseur.
- Ballast selon la revendication 8, caractérisé en ce que deux lampes (La, La') sont agencées en série dans le circuit de lampe, l'électrode de chauffage (K1) située du côté de l'inverseur de la première lampe (La) étant en série avec le bobinage primaire du premier transformateur (Tr'), l'électrode de chauffage (K2') située du côté terre de la seconde lampe (La') étant mise à la terre par l'intermédiaire de la seconde résistance (R') et les deux autres électrodes de chauffage (K1, K1') des lampes étant agencées en série avec un bobinage secondaire d'un second transformateur (Tr) dont un bobinage primaire est agencé en série avec le bobinage primaire du premier transformateur (Tr').
- Ballast selon la revendication 9, caractérisé en ce que le circuit de reconnaissance de lampe (5) permet de mesurer une tension (UVCT) à travers le bobinage primaire du second transformateur (Tr), du côté de l'inverseur.
Priority Applications (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
AT94105853T ATE194749T1 (de) | 1994-04-15 | 1994-04-15 | Vorschaltgerät mit lampenwechselerkennung für entladungslampen |
DE59409443T DE59409443D1 (de) | 1994-04-15 | 1994-04-15 | Vorschaltgerät mit Lampenwechselerkennung für Entladungslampen |
EP94105853A EP0677981B1 (fr) | 1994-04-15 | 1994-04-15 | Ballast, avec dispositif de reconnaissance de changement de lampe, pour tubes à décharge |
US08/421,922 US5550433A (en) | 1994-04-15 | 1995-04-14 | Driver circuit for discharge lamps |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP94105853A EP0677981B1 (fr) | 1994-04-15 | 1994-04-15 | Ballast, avec dispositif de reconnaissance de changement de lampe, pour tubes à décharge |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0677981A1 EP0677981A1 (fr) | 1995-10-18 |
EP0677981B1 true EP0677981B1 (fr) | 2000-07-12 |
Family
ID=8215865
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP94105853A Expired - Lifetime EP0677981B1 (fr) | 1994-04-15 | 1994-04-15 | Ballast, avec dispositif de reconnaissance de changement de lampe, pour tubes à décharge |
Country Status (4)
Country | Link |
---|---|
US (1) | US5550433A (fr) |
EP (1) | EP0677981B1 (fr) |
AT (1) | ATE194749T1 (fr) |
DE (1) | DE59409443D1 (fr) |
Families Citing this family (24)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5574336A (en) * | 1995-03-28 | 1996-11-12 | Motorola, Inc. | Flourescent lamp circuit employing a reset transistor coupled to a start-up circuit that in turn controls a control circuit |
KR0163903B1 (ko) * | 1995-06-05 | 1999-04-15 | 김광호 | 전자식 안정기의 피드백 제어시스템 |
BE1009717A3 (nl) * | 1995-10-20 | 1997-07-01 | Philips Electronics Nv | Schakelinrichting. |
DE19546588A1 (de) * | 1995-12-13 | 1997-06-19 | Patent Treuhand Ges Fuer Elektrische Gluehlampen Mbh | Verfahren und Schaltungsanordnung zum Betrieb einer Entladungslampe |
WO1998038840A1 (fr) * | 1997-02-28 | 1998-09-03 | Toshiba Lighting & Technology Corporation | Materiel d'eclairage et systeme d'eclairage a lampe a decharge |
US6177768B1 (en) * | 1997-04-17 | 2001-01-23 | Toshiba Lighting & Technology Corp. | Discharge lamp lighting device and illumination device |
EP0889675A1 (fr) * | 1997-07-02 | 1999-01-07 | MAGNETEK S.p.A. | Ballast électronique avec reconnaissance du type de lampe |
WO1999034650A1 (fr) * | 1997-12-23 | 1999-07-08 | Tridonic Bauelemente Gmbh | Ballast electronique |
AU1755599A (en) * | 1997-12-23 | 1999-07-19 | Tridonic Bauelemente Gmbh | Method for detecting a lamp change and electronic lamp ballast for operating gas-discharge lamps using such method for detecting a lamp change |
KR100321964B1 (ko) * | 1998-01-05 | 2002-02-02 | 인터내셔널 렉터파이어 코퍼레이션 | 전집적 안정기 집적회로 |
US6331755B1 (en) * | 1998-01-13 | 2001-12-18 | International Rectifier Corporation | Circuit for detecting near or below resonance operation of a fluorescent lamp driven by half-bridge circuit |
US6225760B1 (en) | 1998-07-28 | 2001-05-01 | Lutron Electronics Company, Inc. | Fluorescent lamp dimmer system |
US7412654B1 (en) | 1998-09-24 | 2008-08-12 | Apple, Inc. | Apparatus and method for handling special windows in a display |
US6169375B1 (en) | 1998-10-16 | 2001-01-02 | Electro-Mag International, Inc. | Lamp adaptable ballast circuit |
CA2347470A1 (fr) * | 1998-10-16 | 2000-04-27 | Electro-Mag International, Inc. | Circuit regulateur |
EP1103166B1 (fr) * | 1999-05-25 | 2003-07-16 | TridonicAtco GmbH & Co. KG | Ballast electronique destine a au moins une lampe a decharge basse tension |
DE10013342A1 (de) * | 2000-03-17 | 2001-09-27 | Trilux Lenze Gmbh & Co Kg | Verfahren und Schaltungsanordnung zur Erzeugung einer Zündspannung für Leuchtstofflampen |
AU732605B1 (en) * | 2000-06-14 | 2001-04-26 | Brenex Electrics Pty Limited | Control circuits for fluorescent tubes |
US6448716B1 (en) * | 2000-08-17 | 2002-09-10 | Power Signal Technologies, Inc. | Solid state light with self diagnostics and predictive failure analysis mechanisms |
DE102004018345A1 (de) * | 2004-04-15 | 2005-11-03 | Tridonicatco Gmbh & Co. Kg | Schaltungsanordnung und Verfahren zum Zünden einer Gasentladungslampe mit zeitbegrenzter Startphase |
TWM265641U (en) * | 2004-06-09 | 2005-05-21 | Rilite Corportation | Double shielded electroluminescent panel |
WO2007126737A2 (fr) * | 2006-04-03 | 2007-11-08 | Ceelite Llc | Commande d'intensité constante pour lampe électroluminescente |
US8018173B2 (en) * | 2006-09-03 | 2011-09-13 | Fulham Company Ltd. | Ballasts for fluorescent lamps |
DE102007047141A1 (de) * | 2007-10-02 | 2009-04-09 | Tridonicatco Gmbh & Co. Kg | Betriebsgerät zum Steuern des Einbrennvorganges einer Lampe |
Family Cites Families (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR1452640A (fr) * | 1965-06-02 | 1966-04-15 | Accumulateurs Fixes | Installation électrique de secours |
US4063108A (en) * | 1976-01-02 | 1977-12-13 | Keith Karl Klett | Inverter lockout circuit |
US5426347A (en) * | 1980-08-14 | 1995-06-20 | Nilssen; Ole K. | Lighting system with emergency standby feature |
EP0146683B1 (fr) * | 1981-07-31 | 1987-11-19 | Siemens Aktiengesellschaft | Onduleur |
CH663508A5 (de) * | 1983-09-06 | 1987-12-15 | Knobel Elektro App | Elektronisches vorschaltgeraet fuer fluoreszenzlampen sowie verfahren zu dessen betrieb. |
DE4100349C2 (de) * | 1990-01-31 | 1994-04-28 | Siemens Ag | Elektronisches Vorschaltgerät |
-
1994
- 1994-04-15 DE DE59409443T patent/DE59409443D1/de not_active Expired - Lifetime
- 1994-04-15 EP EP94105853A patent/EP0677981B1/fr not_active Expired - Lifetime
- 1994-04-15 AT AT94105853T patent/ATE194749T1/de not_active IP Right Cessation
-
1995
- 1995-04-14 US US08/421,922 patent/US5550433A/en not_active Expired - Lifetime
Also Published As
Publication number | Publication date |
---|---|
EP0677981A1 (fr) | 1995-10-18 |
US5550433A (en) | 1996-08-27 |
ATE194749T1 (de) | 2000-07-15 |
DE59409443D1 (de) | 2000-08-17 |
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