EP0058683B1 - Anordnung zum betrieb einer entladungslampe mit heizbaren elektroden - Google Patents
Anordnung zum betrieb einer entladungslampe mit heizbaren elektroden Download PDFInfo
- Publication number
- EP0058683B1 EP0058683B1 EP81902288A EP81902288A EP0058683B1 EP 0058683 B1 EP0058683 B1 EP 0058683B1 EP 81902288 A EP81902288 A EP 81902288A EP 81902288 A EP81902288 A EP 81902288A EP 0058683 B1 EP0058683 B1 EP 0058683B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- diode
- discharge lamp
- voltage
- electrode
- electrodes
- 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
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
- H05B41/02—Details
- H05B41/04—Starting switches
- H05B41/042—Starting switches using semiconductor devices
- H05B41/044—Starting switches using semiconductor devices for lamp provided with pre-heating electrodes
- H05B41/046—Starting switches using semiconductor devices for lamp provided with pre-heating electrodes using controlled semiconductor devices
-
- 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 an arrangement for operating a discharge lamp with two heatable electrodes connected to auxiliary voltage sources, between which there is a main AC voltage source.
- Such circuits are generally dimensioned such that the discharge lamp only ignites after sufficient preheating, which benefits its service life. After the ignition, however, the preheating of the electrodes remains during the entire burning time of the lamp although it is then no longer required.
- the invention is therefore based on the object of reducing the associated losses.
- the invention is characterized by the features specified in the characterizing part of the claim.
- the invention is based on the finding that the voltage profile of the two electrodes of a discharge lamp is quite different: at the respective non-emitting electrode (positive anode), the peak value of the voltage drop is, for example, about 2 volts, while it is at the respective emitting electrode (negative Cathode) considerably higher values, e.g. up to about 6 volts.
- the invention therefore limits the voltage at the emitting electrode to the threshold voltage of a diode, which is approximately 1 volt; this results in a corresponding reduction in the losses caused by the continuous heating. This reduction can also be explained by the parallel connection of the electrode parts on both sides of the focal spot, which results in a lower total resistance.
- the diodes are practically harmless for preheating mode if, as is usually the case, a significantly higher voltage is applied to the lamp in this phase and therefore a greater current flows than after the lamp was ignited.
- Different AC voltages for the time before and after the lamp is ignited can be generated in a known manner:
- the secondary winding of a stray field transformer can serve as the main AC voltage source, which is connected between the two electrodes of the discharge lamp.
- the discharge lamp L is arranged parallel to the capacitor C23 of the series resonance circuit, so that its electrodes 11, 12 are connected in series with the series resonance circuit.
- a diode D46 or D47 lies parallel to each electrode: These are polarized so that in each half-wave of the AC voltage applied to C23 only the diode conducts which is connected in parallel to the electrode emitting in this half-wave. Given the polarity of the voltage at C23 shown in the figure, this is the diode D47, which is parallel to the electrode 14 which acts as cathode in this half-wave and bridges this electrode; the other diode D46, on the other hand, is blocked in this half-wave, so that the circuit runs parallel to L4 via L3, C23 and D47. As a result, the voltage at the cathode is limited to the threshold value of the diode (approximately 1 volt), whereas without such a diode approximately 6 volts would be at the cathode.
- the circuit is dimensioned such that the voltage C23 is sufficient for ignition only if the electrodes are sufficiently preheated. It is even better to keep the voltage at C23 below the value required to ignite a warm lamp for a time sufficient for good preheating and only then to increase it to the value required for ignition.
Landscapes
- Circuit Arrangements For Discharge Lamps (AREA)
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
AT81902288T ATE11721T1 (de) | 1980-08-05 | 1981-07-29 | Anordnung zum betrieb einer entladungslampe mit heizbaren elektroden. |
Applications Claiming Priority (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE19803029644 DE3029644A1 (de) | 1980-08-05 | 1980-08-05 | Anordnung zum betrieb einer entladungslampe mit heizbaren elektroden |
DE3029644 | 1980-08-05 | ||
DE3115598 | 1981-04-16 | ||
DE3115598 | 1981-04-16 |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0058683A1 EP0058683A1 (de) | 1982-09-01 |
EP0058683B1 true EP0058683B1 (de) | 1985-02-06 |
Family
ID=25787078
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP81902288A Expired EP0058683B1 (de) | 1980-08-05 | 1981-07-29 | Anordnung zum betrieb einer entladungslampe mit heizbaren elektroden |
Country Status (5)
Country | Link |
---|---|
EP (1) | EP0058683B1 (it) |
DE (1) | DE3168772D1 (it) |
FI (1) | FI812304L (it) |
IT (1) | IT1137760B (it) |
WO (1) | WO1982000561A1 (it) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0750447A1 (de) * | 1995-06-22 | 1996-12-27 | ECKERLE INDUSTRIE-ELEKTRONIK GmbH | Schaltungsanordnung zur Zündung einer Leuchtstofflampe |
Families Citing this family (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE3246454A1 (de) * | 1982-12-15 | 1984-06-20 | Siemens AG, 1000 Berlin und 8000 München | Wechselrichter mit einem einen reihenresonanzkreis und eine entladungslampe enthaltenden lastkreis |
DE3805510A1 (de) * | 1988-02-22 | 1989-08-31 | Patent Treuhand Ges Fuer Elektrische Gluehlampen Mbh | Schaltungsanordnung zum betrieb einer niederdruckentladungslampe |
Family Cites Families (2)
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 |
US4122375A (en) * | 1976-02-06 | 1978-10-24 | Rudolf Studli | Circuit arrangement for increasing the luminous flux in fluorescent tube hand lamps |
-
1981
- 1981-07-22 FI FI812304A patent/FI812304L/fi not_active Application Discontinuation
- 1981-07-29 WO PCT/DE1981/000115 patent/WO1982000561A1/en active IP Right Grant
- 1981-07-29 EP EP81902288A patent/EP0058683B1/de not_active Expired
- 1981-07-29 DE DE8181902288T patent/DE3168772D1/de not_active Expired
- 1981-07-31 IT IT23279/81A patent/IT1137760B/it active
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0750447A1 (de) * | 1995-06-22 | 1996-12-27 | ECKERLE INDUSTRIE-ELEKTRONIK GmbH | Schaltungsanordnung zur Zündung einer Leuchtstofflampe |
DE19522675A1 (de) * | 1995-06-22 | 1997-01-02 | Eckerle Ind Elektronik Gmbh | Schaltungsanordnung zur Zündung einer Leuchtstofflampe |
Also Published As
Publication number | Publication date |
---|---|
IT1137760B (it) | 1986-09-10 |
EP0058683A1 (de) | 1982-09-01 |
IT8123279A0 (it) | 1981-07-31 |
DE3168772D1 (en) | 1985-03-21 |
WO1982000561A1 (en) | 1982-02-18 |
FI812304L (fi) | 1982-02-06 |
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