EP2206414B1 - Vorschaltkreis - Google Patents

Vorschaltkreis Download PDF

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Publication number
EP2206414B1
EP2206414B1 EP08845841A EP08845841A EP2206414B1 EP 2206414 B1 EP2206414 B1 EP 2206414B1 EP 08845841 A EP08845841 A EP 08845841A EP 08845841 A EP08845841 A EP 08845841A EP 2206414 B1 EP2206414 B1 EP 2206414B1
Authority
EP
European Patent Office
Prior art keywords
lamp
lamps
resonance
capacitor
fluorescent lamps
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.)
Not-in-force
Application number
EP08845841A
Other languages
English (en)
French (fr)
Other versions
EP2206414A2 (de
Inventor
Wei Chen
Markus Heckmann
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
Priority to PL08845841T priority Critical patent/PL2206414T3/pl
Publication of EP2206414A2 publication Critical patent/EP2206414A2/de
Application granted granted Critical
Publication of EP2206414B1 publication Critical patent/EP2206414B1/de
Not-in-force legal-status Critical Current
Anticipated expiration legal-status Critical

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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
    • H05B41/295—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 circuit, specifically a ballast circuit for running multiple fluorescent lamps.
  • ballast topologies with multiple parallel load circuits for running plural fluorescent lamps the element tolerances of the resonance circuit generally cause unbalanced resonance characteristics in the circuit. Also different load situations (e.g. a broken lamp) will cause severe unbalance in the ballast topologies. This results overload conditions, which are critical for conventional halfbridge switches and thus demand for a solution of high rate components.
  • WO 01/56337 A1 discloses a fluorescent lamp ballast for driving multiple fluorescent lamps.
  • the object of the invention is to provide an arrangement of ballast topologies for running multiple fluorescent lamps according to claim 1, in which no unbalance occurs even one of the fluorescent lamps is broken.
  • sequence start capacitors for multiple lamps operation is well known in the art. However taking advantage of those sequence start capacitors to solve the unbalance caused by asymmetric LC resonance in parallel circuit is a new idea. Therefore the fundamental idea of the invention, is to use the already existing sequence start capacitors to set the required coupling of multiple load circuits.
  • the sequence start capacitors in parallel between LC resonance circuits are connected to other LC resonance circuit in a multiple lamp operation.
  • the problem of asymmetric LC resonance in parallel circuit is solved and the multiple lamp operation is implemented.
  • Fig. 1 shows an embodiment of the invention, in which a ballast circuit runs two lamps.
  • the ballast circuit is labeled by 2 ⁇ L36W circuit.
  • Lamp 1 and Lamp 2 indicate two lamps connected in series.
  • Capacitors C1 and C2 are ignition capacitors.
  • Capacitors C3 and C4 are sequence start capacitors, and a capacitor C5 is a DC block capacitor.
  • Coils L1 and L2 have a function as a lamp choke respectively.
  • the capacitors C3 and C4 are connected through the filaments between both LC resonance circuits.
  • Fig. 2 shows another embodiment of the invention, in which the ballast circuit runs four lamps.
  • the ballast circuit is labeled by 4 ⁇ L18W circuit.
  • Lamp 1, Lamp 2, Lamp 3 and Lamp 4 indicate four lamps connected in series.
  • Capacitors C1 and C2 in respective LC resonance circuits are ignition capacitors.
  • Capacitors C3 and C4 are sequence start capacitors, and a capacitor C5 is a DC block capacitor.
  • Coils L1 and L2 in respective LC resonance circuits have a function as a lamp choke respectively.
  • the four lamps are divided into two groups, one group comprises lamps Lamp 1 and Lamp 2, the other comprises lamps Lamp 3 and Lamp 4.
  • the four lamps are connected in series, while the respective LC resonance circuits of each group are connected in parallel.
  • the connection of the capacitors C3 and C4 is in a way extended from that shown in Fig. 1 .
  • the capacitors C3 and C4 are connected to every other lamps, i.e. the capacitor C3 is connected across lamps Lamp 2 and Lamp 4, and capacitor C4 is connected across lamps Lamp 1 and Lamp 3. That is to say, the sequence start capacitors C3 and C4 are connected from each LC resonance circuit to the series connection point of the other group of lamps. By such a way it forms an arrangement of a ballast topologies of multiple load circuits.
  • the ballast topologies further comprise two switches U1 and U2 for connecting the resonance circuits to a power supply.
  • the capacitance values range of the sequence start capacitors C3 and C4 is from 140pF to 4.9nF
  • the capacitance values range of the resonance capacitors C1 and C2 in the LC resonance circuits can be selected from 900pF to 16nF
  • the induction values range of the coils L1 and L2 in the resonance circuits is from 950 ⁇ H to 8.4mH.
  • the intended capacitance values range of the sequence start capacitors C3 and C4 is from 20pF to 900pF
  • the intended capacitance values range of the resonance capacitors C1 and C2 in the LC resonance circuits can be selected from 200pF to 3.6nF
  • the intended induction values range of the coils L1 and L2 in the resonance circuits is from 190 ⁇ H to 1.6mH.
  • the number of the lamps in the topologies is not limited to the above-mentioned embodiments.
  • the principle of the invention can be used for any other type of fluorescent lamps and also can be extended to any number of parallel resonance circuits.

Landscapes

  • Circuit Arrangements For Discharge Lamps (AREA)
  • Discharge Heating (AREA)

Claims (1)

  1. Vorschaltkreis zum Betreiben einer ersten, zweiten, dritten und vierten Leuchtstofflampe (Lampe 1, 2, 3, 4), die in der besagten Reihenfolge in Reihe geschaltet sind,
    wobei die Reihenschaltung von Leuchtstofflampen ein erstes Ende an der ersten Leuchtstofflampe (Lampe 1) und ein zweites Ende an der vierten Leuchtstofflampe (Lampe 4) aufweist,
    wobei das erste Ende und das zweite Ende jeweils über einen Resonanzkondensator (C1, C2) mit Erde verbunden sind,
    wobei der Verbindungspunkt zwischen der zweiten und der dritten Lampe über einen DC-Sperrkondensator (C5) mit Erde verbunden ist,
    wobei die Reihenschaltung von zwei Schaltern (U2, U2) zwischen eine DC-Versorgung (V-Bus) und Erde geschaltet ist,
    wobei das erste Ende mit dem Verbindungspunkt der zwei Schalter über eine erste Spule (L1) verbunden ist,
    wobei das zweite Ende mit dem Verbindungspunkt der zwei Schalter über eine zweite Spule (L2) verbunden ist,
    wobei der Vorschaltkreis gekennzeichnet ist durch
    einen ersten Sequenzstart-Kondensator (C4), welcher zwischen das erste Ende und den Verbindungspunkt der dritten und der vierten Leuchtstofflampe (Lampe 3, 4) geschaltet ist, und
    einen zweiten Sequenzstart-Kondensator (C3), welcher zwischen das zweite Ende und den Verbindungspunkt der ersten und der zweiten Leuchtstofflampe (Lampe 1, 2) geschaltet ist.
EP08845841A 2007-10-30 2008-10-09 Vorschaltkreis Not-in-force EP2206414B1 (de)

Priority Applications (1)

Application Number Priority Date Filing Date Title
PL08845841T PL2206414T3 (pl) 2007-10-30 2008-10-09 Obwód statecznika

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CN2007101657190A CN101426322B (zh) 2007-10-30 2007-10-30 镇流器电路
PCT/EP2008/063565 WO2009056431A2 (en) 2007-10-30 2008-10-09 A ballast circuit

Publications (2)

Publication Number Publication Date
EP2206414A2 EP2206414A2 (de) 2010-07-14
EP2206414B1 true EP2206414B1 (de) 2011-12-21

Family

ID=40380569

Family Applications (1)

Application Number Title Priority Date Filing Date
EP08845841A Not-in-force EP2206414B1 (de) 2007-10-30 2008-10-09 Vorschaltkreis

Country Status (5)

Country Link
EP (1) EP2206414B1 (de)
CN (1) CN101426322B (de)
AT (1) ATE538625T1 (de)
PL (1) PL2206414T3 (de)
WO (1) WO2009056431A2 (de)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102105013A (zh) * 2009-12-16 2011-06-22 奥斯兰姆有限公司 启动辅助装置、镇流器以及照明装置

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5747941A (en) * 1995-12-07 1998-05-05 Energy Savings, Inc. Electronic ballast that monitors direct current through lamp filaments
US5636111A (en) * 1996-03-26 1997-06-03 The Genlyte Group Incorporated Ballast shut-down circuit responsive to an unbalanced load condition in a single lamp ballast or in either lamp of a two-lamp ballast
US6366032B1 (en) * 2000-01-28 2002-04-02 Robertson Worldwide, Inc. Fluorescent lamp ballast with integrated circuit

Also Published As

Publication number Publication date
ATE538625T1 (de) 2012-01-15
CN101426322A (zh) 2009-05-06
WO2009056431A2 (en) 2009-05-07
CN101426322B (zh) 2013-01-02
WO2009056431A3 (en) 2009-07-09
PL2206414T3 (pl) 2012-08-31
EP2206414A2 (de) 2010-07-14

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