EP0750447B1 - Schaltungsanordnung zur Zündung einer Leuchtstofflampe - Google Patents
Schaltungsanordnung zur Zündung einer Leuchtstofflampe Download PDFInfo
- Publication number
- EP0750447B1 EP0750447B1 EP96109379A EP96109379A EP0750447B1 EP 0750447 B1 EP0750447 B1 EP 0750447B1 EP 96109379 A EP96109379 A EP 96109379A EP 96109379 A EP96109379 A EP 96109379A EP 0750447 B1 EP0750447 B1 EP 0750447B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- fluorescent lamp
- parallel
- circuit arrangement
- resistance
- ignition
- 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
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
- H05B41/2988—Arrangements for protecting lamps or circuits against abnormal operating conditions for protecting the lamp against abnormal operating conditions
Definitions
- the invention relates to a for ignition Provided heating electrodes fluorescent lamp Circuit arrangement comprising a line filter, an RF oscillator and has an ignition circuit, wherein to each heating electrode has an associated electrical resistance is connected in parallel.
- a fluorescent lamp is, for example, with a Frequency of about 30 kHz operated.
- the applied to terminals of the circuit arrangement Mains voltage first via a mains filter or filter element headed.
- the one at the output of the line filter is filtered by means of a Rectifier and a smoothing capacitor in one sieved DC voltage converted.
- This sifted DC voltage is applied to an inverter that For example.
- Has transistors, the emitters with Emitter resistors are interconnected.
- the Transistors are connected together with a control, the control voltage for the control one Transformer is removed, which is usually is a toroidal transformer.
- the few Primary winding of the transformer with turns is in the operating circuit of the fluorescent lamp.
- a circuit arrangement of the type mentioned is out DE-PS 823 160 known.
- electrical resistors connected in parallel there are ohmic resistances.
- Such an ohmic Resistance usually has a positive resistance-temperature behavior on, i.e. with increasing temperature the resistance value of the ohmic resistance increases.
- EP 0 058 683 B1 describes a circuit arrangement for a fluorescent lamp is known, with each heating electrode a diode is connected in parallel.
- DE-OS 21 51 854 discloses a circuit arrangement, with each heating electrode of a fluorescent lamp Bimetal switch is connected in parallel.
- the abstract JP 3-57 198 shows a circuit arrangement, with which to each heating electrode of a fluorescent lamp a switch is connected in parallel. With these switches extreme temperatures of the heating electrodes are to be prevented will. How these switches are switched is described in made no further details in this abstract. Mechanical switches are shown in the drawing.
- the invention has for its object a To create circuit arrangement of the type mentioned in the introduction, in which electrode overheating due to cathode fire is reliably prevented with simple means.
- This task is carried out in a circuit arrangement initially mentioned type solved according to the invention in that the one connected in parallel to the corresponding heating electrode Resistance is formed by an NTC resistor.
- the circuit arrangement according to the invention has the advantage on that the parallel to the heating electrodes NTC resistors with one or two-sided Heating electrode interruption become low-resistance.
- the circuit arrangement according to the invention has the effect that the heating electrodes during normal operation of the fluorescent lamp low resistance and parallel to the heating electrodes switched NTC resistors are high-resistance.
- these NTC resistors have a low resistance.
- the NTC resistors therefore close the defective ones Short heating electrodes. This applies to both the interruption a single heating electrode as well for the interruption of the two heating electrodes of a fluorescent lamp.
- the Circuit arrangement according to the invention with the Heating electrodes NTC resistors connected in parallel thus advantageously prevents Electrode overheating due to cathode fire. That is under Security aspects are an advantage. This advantage comes with circuitry simple means achieved.
- the drawing shows a circuit arrangement 10 for igniting a fluorescent lamp 14 having heating electrodes 12.
- the circuit arrangement 10 has a line filter 16 and an HF oscillator 18, which are indicated in a block diagram representation.
- the line filter 16 is connected on the input side to a line voltage U N.
- an ignition circuit 20 is also provided, which is also only illustrated in a block diagram representation.
- each of the two heating electrodes 12 of the fluorescent lamp 14 is an associated temperature-dependent resistor 22 connected in parallel.
- these temperature-dependent Resistors 22 are known NTC resistors, i.e. about electrical resistances that one have negative temperature coefficients.
- the heating electrodes 12 low resistance and parallel to the heating electrodes 12 switched temperature-dependent resistors 22 high resistance.
- Heating electrodes 12 becomes the associated temperature-dependent Resistor 22 or the two are temperature dependent Resistors 22 due to the increased current flow and resulting low-temperature increase, so that it easily becomes a corresponding one Short-circuit the defective heating electrode 12 or defective heating electrodes 12 comes.
- NTC resistors 22 connected in parallel consequently, overheating of the Heating electrodes 12 reliably by cathode fire prevented.
Landscapes
- Circuit Arrangements For Discharge Lamps (AREA)
- Discharge Lamps And Accessories Thereof (AREA)
Description
Claims (1)
- Zur Zündung einer Heizelektroden (12) aufweisenden Leuchtstofflampe (14) vorgesehene Schaltungsanordnung, die ein Netzfilter (16), einen HF-Oszillator (18) und einen Zündstromkreis (20) aufweist, wobei zu jeder Heizelektrode (12) ein zugehöriger Widerstand (22) parallel geschaltet ist,
dadurch gekennzeichnet,
daß der Widerstand (22) von einem NTC-Widerstand gebildet ist.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE19522675 | 1995-06-22 | ||
DE19522675A DE19522675A1 (de) | 1995-06-22 | 1995-06-22 | Schaltungsanordnung zur Zündung einer Leuchtstofflampe |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0750447A1 EP0750447A1 (de) | 1996-12-27 |
EP0750447B1 true EP0750447B1 (de) | 1998-07-15 |
Family
ID=7764983
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP96109379A Expired - Lifetime EP0750447B1 (de) | 1995-06-22 | 1996-06-12 | Schaltungsanordnung zur Zündung einer Leuchtstofflampe |
Country Status (3)
Country | Link |
---|---|
EP (1) | EP0750447B1 (de) |
AT (1) | ATE168519T1 (de) |
DE (2) | DE19522675A1 (de) |
Families Citing this family (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
IL121630A0 (en) * | 1997-08-26 | 1998-02-08 | Jbp Technologies Ltd | A circuit for igniting a discharge lamp and a method for operating same |
DE19920030A1 (de) * | 1999-04-26 | 2000-11-09 | Omnitronix Inc | Elektronisches Vorschaltgerät |
DE10113903A1 (de) * | 2001-03-21 | 2002-09-26 | Wedeco Ag | Vorschaltgerät für UV-Strahler sowie Verfahren und Vorrichtung zur Desinfektion von Wässern |
DE10125510A1 (de) * | 2001-05-23 | 2002-12-05 | Innolux Gmbh | Leuchtstofflampenschaltung |
EP2595458A1 (de) * | 2011-11-16 | 2013-05-22 | Dahwa International Limited | Fluoreszenzlampe |
Family Cites Families (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE823160C (de) * | 1949-06-24 | 1951-12-03 | Siemens Schuckertwerke A G | Einrichtung zum Zuenden und Betrieb von gas- oder dampfgefuellten Entladungsroehren, insbesondere Leuchtstofflampen |
CH317682A (de) * | 1954-01-07 | 1956-11-30 | Knobel Dubs Fritz | Zünd- und Betriebseinrichtung für Niederspannungs-Fluoreszenzlampen mit geheizten Kathoden |
FI812304L (fi) * | 1980-08-05 | 1982-02-06 | Siemens Ag | Anordning foer drivande av ett med uppvaermningsbara elektroder foersett gasurladdningsroer |
DE3047289A1 (de) * | 1980-12-16 | 1982-07-29 | Patent-Treuhand-Gesellschaft für elektrische Glühlampen mbH, 8000 München | Zuendvorrichtung fuer eine niederdruckentladungslampe |
JPH0357198A (ja) * | 1989-07-25 | 1991-03-12 | Matsushita Electric Works Ltd | 放電灯点灯装置 |
DE4303595A1 (de) * | 1993-02-08 | 1994-08-11 | Patent Treuhand Ges Fuer Elektrische Gluehlampen Mbh | Schaltungsanordnung zum Betrieb einer Leuchtstofflampe |
-
1995
- 1995-06-22 DE DE19522675A patent/DE19522675A1/de not_active Ceased
-
1996
- 1996-06-12 DE DE59600341T patent/DE59600341D1/de not_active Expired - Fee Related
- 1996-06-12 EP EP96109379A patent/EP0750447B1/de not_active Expired - Lifetime
- 1996-06-12 AT AT96109379T patent/ATE168519T1/de not_active IP Right Cessation
Also Published As
Publication number | Publication date |
---|---|
EP0750447A1 (de) | 1996-12-27 |
DE59600341D1 (de) | 1998-08-20 |
DE19522675A1 (de) | 1997-01-02 |
ATE168519T1 (de) | 1998-08-15 |
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