EP1201106A1 - Elektronisches vorschaltgerät - Google Patents
Elektronisches vorschaltgerätInfo
- Publication number
- EP1201106A1 EP1201106A1 EP00931065A EP00931065A EP1201106A1 EP 1201106 A1 EP1201106 A1 EP 1201106A1 EP 00931065 A EP00931065 A EP 00931065A EP 00931065 A EP00931065 A EP 00931065A EP 1201106 A1 EP1201106 A1 EP 1201106A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- capacitor
- transformer
- discharge lamp
- preheating
- parallel
- 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
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 an electronic ballast according to the preamble of the main claim.
- Electronic ballasts for operating low-pressure discharge lamps usually have a preheating of the electrodes, a current-controlled preheating and a voltage-controlled preheating being known.
- current-controlled preheating the heating filaments of the discharge lamp are operated in series with the lamp parallel capacitor.
- a preheating is possible due to a frequency shift, the preheating frequency being higher than the operating frequency and the current falling with increasing frequency.
- the level of preheating, ie the preheating current is determined by the size of the capacitor, the preheating frequency and the maximum preheating voltage on the lamp.
- a capacitor assigned to each lamp type must be used, so that the ballast must always be adapted to the lamp type used.
- An ECG with such a preheating is known from EP 0 535 911 AI and EP 0 769 889 AI, the heating current being limited by a capacitive load or a capacitive and ohmic load.
- the invention is therefore based on the object of providing an electronic ballast with preheating in which the operating losses due to the preheating are kept low and in which an excessive inrush current is avoided.
- this object is achieved by the characterizing features of the main claim. Due to the use of a transformer, which quickly saturates when switched on and in which the primary winding is connected in series to the lamp parallel capacitor and in which a secondary winding is parallel to the respective heating coil, practically both previously known preheating t linked together. In the first switch-on moment, the current-controlled preheating prevails in order to switch to a voltage-controlled preheating within a very short time. As a result, there is no first greatly increased inrush current, so that even sensitive heating coils can be controlled without much additional effort. In addition, a so-called universal electronic ballast can be provided, since the lamp parallel capacitor can be chosen relatively freely and thus only one capacitor can be used for all or more types of lamps.
- FIG. 1 An embodiment of the invention is shown in the drawing and is explained in more detail in the following description.
- the single figure shows the circuit configuration of a load circuit supplied by an inverter.
- the circuit for electronic ballasts shown in the figure has a standard half-bridge circuit as the output circuit of the ballast, which is represented by the electronic switches T1 and T2 and by the two half-bridge capacitors C H ⁇ and C H2 .
- the half-bridge circuit is connected to the supply voltage + Ut > .
- a choke L1 is connected to the connection point between the two electronic switches T1, T2, which connects one heating filament 2 of the discharge lamp 1 to one connection connected is.
- the other heating coil 3 is connected with a connection to the connection point of the two half-bridge capacitors C H ⁇ , C H2 .
- one or the other capacitor of the half-bridge can also be omitted.
- the capacitor which is usually parallel to the lamp 1 is denoted by Ci, the capacitor being connected to the primary winding 4 of a transformer 2 in such a way that the series circuit comprising the capacitor CI and the primary winding 4 is connected in parallel to the discharge lamp 1.
- the capacitor CI is dimensioned so that it does not reach the ignition voltage at the preheating frequency, which is, however, supplied by the frequency shift.
- the transformer 2 has two secondary windings 5, 6, all windings being arranged on a toroidal core, so that the transformer is designed as a toroidal core transformer.
- a coupling capacitor Ci and C k2 In series with the respective secondary winding 5, 6 is a coupling capacitor Ci and C k2 , the coupling capacitor and secondary winding being arranged in parallel with the respective heating coil 2 , 3.
- the coupling capacitors are used for DC decoupling.
- the toroidal transformer 2 is characterized in that it immediately saturates when there is a surge above a limit, since there is no air gap.
- the lamp parallel circuit that is to say a capacitor with a heating transformer, can be placed directly against + U b or ground (GN).
- GN ground
- Toroidal core here also the heating currents. As soon as the ignition voltage of the illuminant or the discharge lamp 1 is reached, the lamp ignites and the voltage breaks down to the operating voltage of the lamp. At the operating frequency, the reactive current through the capacitor Ci is much smaller, as a result of which the heating current also becomes smaller and the losses in the heating coils 2, 3 are reduced.
- the circuit provides a preheating combined from a current-controlled preheating and a voltage-controlled preheating, with the current-controlled preheating predominating in the first switch-on moment, which merges into a voltage-controlled preheating within a very short time.
Landscapes
- Circuit Arrangements For Discharge Lamps (AREA)
- Glass Compositions (AREA)
- Furan Compounds (AREA)
- Mechanical Treatment Of Semiconductor (AREA)
- Magnetic Resonance Imaging Apparatus (AREA)
Description
Claims
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE19920030 | 1999-04-26 | ||
DE19920030A DE19920030A1 (de) | 1999-04-26 | 1999-04-26 | Elektronisches Vorschaltgerät |
PCT/EP2000/003584 WO2000065886A1 (de) | 1999-04-26 | 2000-04-20 | Elektronisches vorschaltgerät |
Publications (2)
Publication Number | Publication Date |
---|---|
EP1201106A1 true EP1201106A1 (de) | 2002-05-02 |
EP1201106B1 EP1201106B1 (de) | 2003-02-19 |
Family
ID=7906626
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP00931065A Expired - Lifetime EP1201106B1 (de) | 1999-04-26 | 2000-04-20 | Elektronisches vorschaltgerät |
Country Status (7)
Country | Link |
---|---|
EP (1) | EP1201106B1 (de) |
AT (1) | ATE233039T1 (de) |
AU (1) | AU7193800A (de) |
DE (2) | DE19920030A1 (de) |
DK (1) | DK1201106T3 (de) |
ES (1) | ES2190969T3 (de) |
WO (1) | WO2000065886A1 (de) |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE10304544B4 (de) * | 2003-02-04 | 2006-10-12 | Hep Tech Co.Ltd. | Elektronisches Vorschaltgerät |
Family Cites Families (9)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE3312572A1 (de) * | 1983-04-08 | 1984-10-18 | Trilux-Lenze Gmbh + Co Kg, 5760 Arnsberg | Elektronisches vorschaltgeraet fuer eine leuchtstofflampe |
JP2793259B2 (ja) * | 1989-05-25 | 1998-09-03 | 松下電工株式会社 | 放電灯点灯装置 |
DE4014355A1 (de) * | 1989-06-27 | 1991-01-03 | Siemens Ag | Elektronisches vorschaltgeraet fuer leuchtstofflampen |
DE4025938A1 (de) * | 1990-08-16 | 1992-02-20 | Diehl Gmbh & Co | Schaltungsanordnung fuer den betrieb einer leuchtstofflampe |
JPH04223098A (ja) * | 1990-12-25 | 1992-08-12 | Matsushita Electric Works Ltd | 放電灯点灯装置 |
JP3257561B2 (ja) * | 1991-09-30 | 2002-02-18 | 東芝ライテック株式会社 | 放電ランプ点灯装置および照明器具 |
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 |
DE19522675A1 (de) * | 1995-06-22 | 1997-01-02 | Eckerle Ind Elektronik Gmbh | Schaltungsanordnung zur Zündung einer Leuchtstofflampe |
BE1009717A3 (nl) * | 1995-10-20 | 1997-07-01 | Philips Electronics Nv | Schakelinrichting. |
-
1999
- 1999-04-26 DE DE19920030A patent/DE19920030A1/de not_active Ceased
-
2000
- 2000-04-20 WO PCT/EP2000/003584 patent/WO2000065886A1/de active IP Right Grant
- 2000-04-20 AT AT00931065T patent/ATE233039T1/de not_active IP Right Cessation
- 2000-04-20 ES ES00931065T patent/ES2190969T3/es not_active Expired - Lifetime
- 2000-04-20 DK DK00931065T patent/DK1201106T3/da active
- 2000-04-20 DE DE50001296T patent/DE50001296D1/de not_active Expired - Lifetime
- 2000-04-20 AU AU71938/00A patent/AU7193800A/en not_active Abandoned
- 2000-04-20 EP EP00931065A patent/EP1201106B1/de not_active Expired - Lifetime
Non-Patent Citations (1)
Title |
---|
See references of WO0065886A1 * |
Also Published As
Publication number | Publication date |
---|---|
EP1201106B1 (de) | 2003-02-19 |
ES2190969T3 (es) | 2003-09-01 |
DE50001296D1 (de) | 2003-03-27 |
DK1201106T3 (da) | 2003-06-10 |
WO2000065886A1 (de) | 2000-11-02 |
DE19920030A1 (de) | 2000-11-09 |
AU7193800A (en) | 2000-11-10 |
ATE233039T1 (de) | 2003-03-15 |
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