EP0585727B1 - Wechselrichterschaltung mit zwei in Reihe geschalteten Glättungskapazitäten - Google Patents
Wechselrichterschaltung mit zwei in Reihe geschalteten Glättungskapazitäten Download PDFInfo
- Publication number
- EP0585727B1 EP0585727B1 EP93113170A EP93113170A EP0585727B1 EP 0585727 B1 EP0585727 B1 EP 0585727B1 EP 93113170 A EP93113170 A EP 93113170A EP 93113170 A EP93113170 A EP 93113170A EP 0585727 B1 EP0585727 B1 EP 0585727B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- capacitors
- series
- smoothing
- inverter
- centre tap
- 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
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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
Definitions
- the present invention relates to an inverter of known type with two in series switched controllable switches between the inputs of the inverter, which a series circuit formed from two bridge capacitors is connected in parallel. At a Such a circuit arrangement connects the load circuit to the two center taps mentioned series circuits of switches and capacitors such as this from DE 40 21 640 A1 is known. Inverters of the type mentioned are particularly in Ballasts that control gas discharge lamps are used.
- Inverters of the type described above tend to be instable as a result of partially negative characteristic of the lamp. These instabilities can Fluctuations in the supply voltage or changes in temperature occur.
- the invention is therefore based on the object of an inverter circuit to specify, which avoids the above-mentioned instabilities in a simple manner.
- instabilities in inverters of the type described above can be avoided in that the inverter has a relatively large Capacity is connected in parallel.
- Such can for example in the form of a Smoothing capacitor of the rectifier circuit may be present.
- This can occurring instabilities apparently not to be avoided, since the usually as Smoothing capacitors used electrolytic capacitors in the Inverter frequency in the kilohertz range have a different behavior than in Grid frequency, i.e. in this frequency range they no longer act as pure Capacitors.
- a ballast for gas discharge lamps, the inverter of the above Art includes, is known for example from EP 0 392 834.
- the one revealed in it Circuit arrangement contains an inverter with two series connected controllable switches, a load circuit of the lamp and a charging capacitor, one capacitive charge pump circuit and a smoothing capacitor of the rectifier.
- the capacitive charge pump circuit is a trick circuit consisting of four capacitors and two diodes to reduce the harmonic content.
- a Ballast for a gas discharge lamp with one powered by the mains Rectifier that has a smoothing circuit between its two outputs and in turn supplies an inverter that has two series and includes controllable switches located between the two inputs; one parallel to the two controllable switches arranged in series from two directly connected bridge capacities; and a load that the center tap of the Series connection of the two switches with the center tap of the bridge capacities connects.
- the smoothing circuit consists of two series and directly connected smoothing capacities, the center tap of the Bridge capacities is directly with the center tap of the two smoothing capacities connected is.
- the measure according to the invention leads to the goal without considerable additional effort, since the two smoothing capacitors now used and connected in series are only exposed to half the rectified AC voltage and accordingly even have to endure half the maximum voltage.
- Figure 1 shows an example of the structure of a self-oscillating inverter.
- Series connection of two controllable switches 101, 102 preferably transistors or field effect transistors.
- An output terminal c of the inverter is via a Primary winding 109 of a transformer to one designated as the center tap p Potential point connected to the collector of lower transistor 102 connected.
- the emitter and the base of the upper transistor 101 are opposite the potential point p biased by resistors 105 and 104, respectively.
- Base bias resistor 104 is a series connection of another resistor 103 and a secondary winding 110 of the transformer.
- the start The oscillation process is carried out by a start pulse which is sent to the base via a diac 112 of the lower transistor 102 is transmitted.
- a start pulse which is sent to the base via a diac 112 of the lower transistor 102 is transmitted.
- the inverter hears everyone Zero crossing of the input voltage to swing on. In this case it is not only at the start of the inverter but also at every zero crossing Input voltage triggering of the switches necessary.
- both switches are open at the beginning. If a trigger signal is now transmitted to the lower switch 102, this closes and a load current can flow. Via the transmitter, i.e. over its primary winding 109, after a certain time the lower switch becomes by means of the secondary winding 111 opened again and the upper switch 101 by means of the secondary winding 110 closed. The while the lower switch 102 is closed over the reactor 115 and switch 102 current flowing to ground will open maintain the switch through the choke 115. This forced flow of electricity leads without the freewheeling diodes 113, 114 to excessive voltage on components of the Inverter that can destroy them.
- bipolar transistors are used, which can of course be replaced by, for example, field effect transistors.
- Field effect transistors are generally dashed in the prior art drawn external freewheeling diodes waived, since the field effect transistors already have such diodes internally.
- FIG. 3 shows an inverter circuit with one connected to it Gas discharge lamp.
- the one indicated in FIG. 1 attacking terminal c Load circuit has inductance 215 and a parallel connection from the Gas discharge lamp 216 and a capacitor 217, which are arranged in series and end at a terminal d.
- Form inductor 215 and capacitor 217 the series resonant circuit necessary for the operation of the gas discharge lamp 216.
- Point d is the center tap of a series connection of two bridge capacitors 218, 219, the between the positive input a and the reference potential input b of the Inverter is arranged.
- the one electrolytic capacitor according to the invention by two in Series-connected and directly connected smoothing capacitors 220, 221 lower capacity and half maximum voltage replaced, for the commercial Electrolytic capacitors can be used.
- 221 directly interconnecting conductor 222 can bridge capacitors 218, 219 through the smoothing capacitances 220, 221 are capacitively stabilized.
- the gas discharge lamp 216 is largely stable and independent of voltage and temperature fluctuations.
Landscapes
- Circuit Arrangements For Discharge Lamps (AREA)
- Inverter Devices (AREA)
Description
Claims (6)
- Vorschaltgerät für eine Gasentladungslampe mit einem vom Netz gespeisten Gleichrichter, der eine Glättungsschaltung (220, 221) zwischen seinen beiden Ausgängen aufweist und seinerseits einen Wechselrichter versorgt, der zwei in Serie angeordnete und zwischen den beiden Eingängen (A, B) liegende steuerbare Schalter (201, 202) umfaßt:einer parallel zu den beiden steuerbaren Schaltern (201, 202) angeordneten Serienschaltung aus zwei direkt verbundenen Brücken-Kapazitäten (218, 219); undeiner Last, die den Mittelabgriff der Serienschaltung der beiden Schalter (201, 202) mit dem Mittelabgriff der Brücken-Kapazitäten (218, 219) verbindet,daß die Glättungsschaltung aus zwei in Serie geschalteten und unmittelbar miteinander verbundenen Glättungskapazitäten (220, 221) besteht; undder Mittelabgriff der Brücken-Kapazitäten (218, 219) mit dem Mittelabgriff der beiden Glättungskapazitäten (220, 221) direkt verbunden ist.
- Vorschaltgerät nach Anspruch 1,
dadurch gekennzeichnet, daßdie steuerbaren Schalter (201, 202) Transistoren und/oder Feldeffekttransistoren sind. - Vorschaltgerät nach Anspruch 1 oder 2,
dadurch gekennzeichnet, daßdie Last eine Serienschaltung aus einer Primärwicklung (209) eines Transformators, einer Induktivität (215) und einer Parallelschaltung aus einer Kapazität (217) und der Gasentladungslampe (216) aufweist. - Vorschaltgerät nach Anspruch 3,
dadurch gekennzeichnet, daßder Transformator Sekundärwicklungen (211, 216) aufweist, wobei jeweils eine Sekundärwicklung (211 bzw. 216) im Steuerkreis jeweils eines Schalters (201 bzw. 202) angeordnet ist. - Vorschaltgerät nach Anspruch 4,
dadurch gekennzeichnet, daßzumindest ein Steuerkreis eines Schalters (211) mit einem Triggerelement (212) verbunden ist. - Vorschaltgerät nach einem der vorhergehenden Ansprüche,
dadurch gekennzeichnet,daß die Glättungskapazitäten (220, 221) Elektrolytkondensatoren sind.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE4228682A DE4228682A1 (de) | 1992-08-28 | 1992-08-28 | Vorschaltgerät für eine Gasentladungslampe mit einer Wechselrichterschaltung |
DE4228682 | 1992-08-28 |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0585727A1 EP0585727A1 (de) | 1994-03-09 |
EP0585727B1 true EP0585727B1 (de) | 1998-11-18 |
Family
ID=6466668
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP93113170A Expired - Lifetime EP0585727B1 (de) | 1992-08-28 | 1993-08-17 | Wechselrichterschaltung mit zwei in Reihe geschalteten Glättungskapazitäten |
Country Status (3)
Country | Link |
---|---|
EP (1) | EP0585727B1 (de) |
AT (1) | ATE173576T1 (de) |
DE (2) | DE4228682A1 (de) |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US6731075B2 (en) * | 2001-11-02 | 2004-05-04 | Ampr Llc | Method and apparatus for lighting a discharge lamp |
Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE4021640A1 (de) * | 1990-07-06 | 1992-01-09 | Zumtobel Ag | Helligkeitssteuer-schaltungsanordnung |
Family Cites Families (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE2909605A1 (de) * | 1979-03-12 | 1980-09-25 | Patra Patent Treuhand | Vorschaltanordnung zum betreiben einer entladungslampe |
GB2124042B (en) * | 1982-06-01 | 1986-10-01 | Control Logic | Reduction of harmonics in gas discharge lamp ballasts |
AU2388284A (en) * | 1983-01-28 | 1984-08-02 | Control Logic Pty. Ltd. | Inverter circuit |
US4996462A (en) * | 1988-07-27 | 1991-02-26 | Siemens Aktiengesellschaft | Electronic ballast for fluoroscent lamps |
US4914558A (en) * | 1989-03-06 | 1990-04-03 | Jon Flickinger | Series resonant inverter and method of lamp starting |
DE69016815T2 (de) * | 1989-04-14 | 1995-09-07 | Tlg Plc | Vorschaltgeräte für Gasentladungslampen. |
IL93265A0 (en) * | 1990-02-04 | 1990-11-29 | Gaash Lighting Ind | Electronic ballast for gas discharge lamp |
-
1992
- 1992-08-28 DE DE4228682A patent/DE4228682A1/de not_active Withdrawn
-
1993
- 1993-08-17 EP EP93113170A patent/EP0585727B1/de not_active Expired - Lifetime
- 1993-08-17 AT AT93113170T patent/ATE173576T1/de not_active IP Right Cessation
- 1993-08-17 DE DE59309134T patent/DE59309134D1/de not_active Expired - Fee Related
Patent Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE4021640A1 (de) * | 1990-07-06 | 1992-01-09 | Zumtobel Ag | Helligkeitssteuer-schaltungsanordnung |
Also Published As
Publication number | Publication date |
---|---|
DE59309134D1 (de) | 1998-12-24 |
EP0585727A1 (de) | 1994-03-09 |
ATE173576T1 (de) | 1998-12-15 |
DE4228682A1 (de) | 1994-03-03 |
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