EP1590993A1 - Ballast electronique - Google Patents

Ballast electronique

Info

Publication number
EP1590993A1
EP1590993A1 EP04707218A EP04707218A EP1590993A1 EP 1590993 A1 EP1590993 A1 EP 1590993A1 EP 04707218 A EP04707218 A EP 04707218A EP 04707218 A EP04707218 A EP 04707218A EP 1590993 A1 EP1590993 A1 EP 1590993A1
Authority
EP
European Patent Office
Prior art keywords
lamp
circuit
preheating
discharge lamp
sub
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.)
Granted
Application number
EP04707218A
Other languages
German (de)
English (en)
Other versions
EP1590993B1 (fr
Inventor
Michael Winkel
Franz Tusch
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.)
HEP Tech Co Ltd
Original Assignee
HEP Tech Co Ltd
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 HEP Tech Co Ltd filed Critical HEP Tech Co Ltd
Publication of EP1590993A1 publication Critical patent/EP1590993A1/fr
Application granted granted Critical
Publication of EP1590993B1 publication Critical patent/EP1590993B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

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

Definitions

  • the invention relates to a ballast for low-pressure discharge lamps, with a controllable inverter circuit for generating a high-frequency supply voltage for a discharge lamp, a lamp inductor connected to the inverter circuit, a lamp parallel capacitor connected in series with the lamp inductor and connected in parallel with the discharge lamp, and with a preheating circuit for supply the electrodes of the discharge lamp with heating current.
  • Such a ballast is known for example from DE 199 20 030 A1.
  • the electrodes of the discharge lamp designed as heating filaments are preheated so that they are excited to emit glow.
  • the frequency of the supply voltage is changed from a preheating frequency to an operating frequency by means of the controllable inverter circuit. This leads to the fact that the series resonant circuit formed by the lamp inductor and the lamp parallel capacitor comes into resonance, so that a sufficient ignition voltage is present at the discharge lamp for ignition.
  • the known ballast has a heating transformer, the primary winding of which is connected in series with the lamp parallel capacitor.
  • the secondary windings of the heating transformer supply the electrodes of the discharge lamp, which are designed as heating coils, with heating current.
  • the preheating voltage applied to the primary winding of the heating transformer thus becomes determined exclusively by the voltage drop across the lamp parallel capacitor. During the transition from the preheating frequency to the operating frequency, this voltage increases, so that the heating current also increases. However, the heating current is limited by the saturation that occurs in the heating transformer. When the discharge lamp is ignited, the voltage across the lamp parallel capacitor collapses to the operating voltage of the lamp. The heating current flowing through the heating coils of the electrodes in the operating state is reduced accordingly.
  • a disadvantage of the known ballast is that a continuous heating current flows even during the continuous operation of the discharge lamp, which leads to increased energy consumption.
  • Discharge lamp flows.
  • the heating current is only due to the saturation of the
  • the heating filaments can be destroyed.
  • the object of the present invention is to provide an electronic ballast for low-pressure discharge lamps, in which losses caused by the preheating circuit are minimized and which can be used universally, in particular also for discharge lamps with sensitive electrodes.
  • the preheating circuit is supplied with current from an auxiliary winding attached to the lamp inductor, the auxiliary winding being connected to the preheating circuit via a controllable switch or a parallel resonance circuit.
  • the preheating circuit of the ballast is supplied with current from an auxiliary winding mounted on the lamp choke, it is achieved that the power supply of the preheating circuit - unlike in the known ballast - is independent of the reactive current flowing through the lamp parallel capacitor.
  • the use of the auxiliary winding on the lamp choke also has the advantage that the heating current can be increased slowly during the switch-on process by slowly lowering the frequency of the supply voltage from a high preheating frequency to the operating frequency.
  • the power supply to the preheating circuit can be interrupted by means of the controllable switch or by means of the parallel resonance circuit during the continuous operation of the lamp. This effectively prevents undesirable losses due to a heating current flowing continuously during lamp operation.
  • a transistor can be used as a controllable switch in the usual way, by means of which the electrical connection between the auxiliary winding attached to the lamp inductor and the preheating circuit is interrupted.
  • the preheating circuit has a heating transformer, the primary winding of which is connected to the auxiliary winding and the secondary windings are connected to the electrodes of the discharge lamp.
  • the primary winding is accordingly fed by the auxiliary winding attached to the lamp inductor, a secondary winding being provided in each case for heating an electrode of the discharge lamp.
  • the saturation that occurs in the heating transformer when there is a strong current flow through the lamp inductor can be used to limit the heating current.
  • the heating transformer can expediently be designed as a toroidal core transformer.
  • the frequency of the supply voltage should expediently be changed from a preheating frequency for preheating the by means of the controllable inverter circuit
  • Electrodes can be changed to a different operating frequency for the continuous operation of the discharge lamp.
  • an interruption of the power supply to the preheating circuit can then be achieved in that the parallel resonance circuit connected between the auxiliary winding arranged on the lamp inductor and the preheating circuit is matched to the operating frequency of the discharge lamp.
  • ballast according to the invention is explained with reference to the circuit outlined in the drawing.
  • a supply voltage Ü b is present at a half bridge consisting of two electronic switches Ti and T 2 .
  • the half-bridge circuit consisting of the two electronic switches Ti and T 2 forms part of a controllable inverter circuit for generating a high-frequency supply voltage for a discharge lamp 1.
  • the electronic switches Ti and T 2 are alternately operated by an electronic control circuit (not shown in more detail) in accordance with the desired frequency of the supply voltage on and off.
  • the discharge lamp 1 is connected via a choke Li to the half bridge consisting of the two switches Ti and T 2 .
  • a lamp parallel capacitor Ci is connected in parallel to the discharge lamp 1 and in series with the lamp inductor Li.
  • a preheating circuit is also provided, via which electrodes 2 and 3 of the discharge lamp 1 are supplied with heating current.
  • the preheating circuit consists of a toroidal transformer 4, the secondary windings 5 and 6 of which are connected to the electrodes 2 and 3.
  • the preheating circuit is supplied with current by an auxiliary winding 7 mounted on the lamp inductor Li.
  • the auxiliary winding 7 is connected to a primary winding 8 of the toroidal transformer 4, a parallel resonance circuit 9 being connected between the auxiliary winding 7 and the primary winding 8.
  • the parallel resonance circuit 9 is tuned to the operating frequency of the discharge lamp 1 in such a way that only a minimal current flows through the primary winding 8 of the toroidal core transformer 4 during the continuous operation of the discharge lamp 1.
  • capacitors CM and C k2 are provided, which are used for DC decoupling.
  • a capacitor C h connected between the lamp inductor Li and the discharge lamp 1 is also used for DC decoupling.
  • a supply voltage whose frequency corresponds to a preheating frequency is first generated by means of the electronic switches Ti and T 2 .
  • the current flowing through the choke L ⁇ ⁇ at this frequency induces a voltage in the auxiliary winding 7, which leads to a current flow in the primary winding 8 of the heating transformer 4.
  • the parallel resonance circuit 9 is far outside of its resonance at the preheating frequency.
  • the current flowing through the primary winding 8 leads to a current flowing through the electrodes 2 and 3, which are fed by the secondary windings 5 and 6 of the heating transformer 4.
  • the frequency of the supply voltage is reduced by means of the controllable inverter circuit from the preheating frequency to a different operating frequency for the continuous operation of the discharge lamp 1.
  • the series resonant circuit consisting of the choke Li and the lamp parallel capacitor Ci comes into resonance, so that an ever increasing voltage is present at the discharge lamp 1.
  • the discharge lamp 1 ignites and the voltage breaks down to the operating voltage of the discharge lamp 1.
  • the parallel resonance circuit 9 is in resonance, so that the heating current flowing through the electrodes 2 and 3 is greatly reduced. During the continuous operation of the lamp 1, only a minimal heating current flows through the electrodes 2 and 3.

Landscapes

  • Circuit Arrangements For Discharge Lamps (AREA)
  • Mechanical Treatment Of Semiconductor (AREA)
  • Glass Compositions (AREA)
  • Furan Compounds (AREA)
EP04707218A 2003-02-04 2004-02-02 Ballast electronique Expired - Lifetime EP1590993B1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE10304544 2003-02-04
DE10304544A DE10304544B4 (de) 2003-02-04 2003-02-04 Elektronisches Vorschaltgerät
PCT/EP2004/000921 WO2004071135A1 (fr) 2003-02-04 2004-02-02 Ballast electronique

Publications (2)

Publication Number Publication Date
EP1590993A1 true EP1590993A1 (fr) 2005-11-02
EP1590993B1 EP1590993B1 (fr) 2009-05-27

Family

ID=32730743

Family Applications (1)

Application Number Title Priority Date Filing Date
EP04707218A Expired - Lifetime EP1590993B1 (fr) 2003-02-04 2004-02-02 Ballast electronique

Country Status (6)

Country Link
US (1) US7279844B2 (fr)
EP (1) EP1590993B1 (fr)
CN (1) CN1748447B (fr)
AT (1) ATE432606T1 (fr)
DE (2) DE10304544B4 (fr)
WO (1) WO2004071135A1 (fr)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102005057107B4 (de) * 2004-11-25 2013-11-14 Kk Elektrotechnik Gmbh Vorschaltgerät
CN101170863A (zh) * 2006-10-27 2008-04-30 马士科技有限公司 一种电流激励无磁环反馈式镇流器
US8232727B1 (en) 2009-03-05 2012-07-31 Universal Lighting Technologies, Inc. Ballast circuit for a gas-discharge lamp having a filament drive circuit with monostable control
KR101658210B1 (ko) * 2010-02-19 2016-09-21 페어차일드코리아반도체 주식회사 예열 제어 장치, 이를 포함하는 램프 구동 장치및 예열 제어 방법

Family Cites Families (19)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5510681A (en) * 1978-03-20 1996-04-23 Nilssen; Ole K. Operating circuit for gas discharge lamps
FR2446579A1 (fr) 1978-11-10 1980-08-08 Abadie Henri Perfectionnements aux dispositifs d'alimentation de tube fluorescent
DE3312572A1 (de) * 1983-04-08 1984-10-18 Trilux-Lenze Gmbh + Co Kg, 5760 Arnsberg Elektronisches vorschaltgeraet fuer eine leuchtstofflampe
MX9102104A (es) * 1990-12-19 1992-06-01 Philips Nv Adaptacion para desconectar el electrodo de una lampara fluorescente
US5406174A (en) * 1992-12-16 1995-04-11 U. S. Philips Corporation Discharge lamp operating circuit with frequency control of dimming and lamp electrode heating
EP0602719B1 (fr) * 1992-12-16 1998-10-21 Koninklijke Philips Electronics N.V. Onduleur haute fréquence pour alimenter une lampe à décharge munie d'électrodes de préchauffage
US5656891A (en) * 1994-10-13 1997-08-12 Tridonic Bauelemente Gmbh Gas discharge lamp ballast with heating control circuit and method of operating same
JP3484863B2 (ja) * 1995-03-29 2004-01-06 東芝ライテック株式会社 電源装置、放電灯点灯装置および照明装置
DE19520999A1 (de) * 1995-06-08 1996-12-12 Siemens Ag Schaltungsanordnung zur Wendelvorheizung von Leuchtstofflampen
BE1009717A3 (nl) * 1995-10-20 1997-07-01 Philips Electronics Nv Schakelinrichting.
US5920155A (en) * 1996-10-28 1999-07-06 Matsushita Electric Works, Ltd. Electronic ballast for discharge lamps
US5959408A (en) * 1997-08-07 1999-09-28 Magnetek, Inc. Symmetry control circuit for pre-heating in electronic ballasts
EP0986937A1 (fr) * 1998-04-02 2000-03-22 Koninklijke Philips Electronics N.V. Systeme de circuit
US5973455A (en) 1998-05-15 1999-10-26 Energy Savings, Inc. Electronic ballast with filament cut-out
US6111369A (en) * 1998-12-18 2000-08-29 Clalight Israel Ltd. Electronic ballast
DE19920030A1 (de) * 1999-04-26 2000-11-09 Omnitronix Inc Elektronisches Vorschaltgerät
WO2000069226A1 (fr) * 1999-05-06 2000-11-16 Koninklijke Philips Electronics N.V. Circuit
DE19923083A1 (de) * 1999-05-20 2001-01-04 Hueco Electronic Gmbh Vorschaltgerät für Niederdruckentladungslampen
DE10102837A1 (de) * 2001-01-22 2002-07-25 Patent Treuhand Ges Fuer Elektrische Gluehlampen Mbh Betriebsgerät für Gasentladungslampen mit Abschaltung der Wendelheizung

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO2004071135A1 *

Also Published As

Publication number Publication date
DE10304544B4 (de) 2006-10-12
EP1590993B1 (fr) 2009-05-27
CN1748447B (zh) 2010-06-16
US20060103327A1 (en) 2006-05-18
DE10304544A1 (de) 2004-08-19
ATE432606T1 (de) 2009-06-15
WO2004071135A1 (fr) 2004-08-19
DE502004009526D1 (de) 2009-07-09
US7279844B2 (en) 2007-10-09
CN1748447A (zh) 2006-03-15

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