EP0699016A2 - Circuit for operating low pressure discharge lamps - Google Patents

Circuit for operating low pressure discharge lamps Download PDF

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Publication number
EP0699016A2
EP0699016A2 EP95112518A EP95112518A EP0699016A2 EP 0699016 A2 EP0699016 A2 EP 0699016A2 EP 95112518 A EP95112518 A EP 95112518A EP 95112518 A EP95112518 A EP 95112518A EP 0699016 A2 EP0699016 A2 EP 0699016A2
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EP
European Patent Office
Prior art keywords
circuit
lamp
capacitor
low
pressure discharge
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EP95112518A
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German (de)
French (fr)
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EP0699016A3 (en
Inventor
Anton Zuchtriegel
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Osram GmbH
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Patent Treuhand Gesellschaft fuer Elektrische Gluehlampen mbH
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Publication of EP0699016A3 publication Critical patent/EP0699016A3/en
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    • 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

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  • the invention relates to a circuit arrangement for the high-frequency operation of one or more low-wattage low-pressure discharge lamps connected in series with one another in accordance with the preamble of claim 1.
  • this circuit arrangement is that the half-bridge circuit and the intermediate circuit capacitor required in such switching power supplies generate harmonics in the network in parallel with the DC output of the line rectifier.
  • this mains current harmonic content must comply with class C of the regulations for ballasts or converters with a power consumption of more than 25 W from 1996 and with class D of the regulations for compact lamps, ballasts and adapters with a power consumption of less than or equal to 25 W from 1998.
  • ballasts for lamps larger than 25 W require DC link capacitors with higher capacities.
  • active harmonic filter circuits in the form of complex pump circuits with capacitors and diodes are required for these lamps in order to be able to meet the IEC regulations of class C.
  • Such a circuit arrangement is e.g. described in DE-OS 36 23 749. These active circuits also result in additional radio interference, which can only be prevented with a high expenditure on components.
  • the object of the invention is to provide a circuit arrangement for operating low-wattage low-pressure discharge lamps, i.e. to create less than or equal to 25 W, which keeps the mains harmonic content below the maximum values specified in class D of the IEC publications.
  • the circuitry required for this should be as small and inexpensive as possible.
  • the harmonic filter circuit according to the invention consisting of two diodes and two capacitors ensures safe operation of the half-bridge generator in the zero crossing of the mains sine voltage.
  • the circuit does not work actively like the pump circuits listed above, but passively, so that only slight radio interference occurs and the expenditure on components for radio interference suppression can be kept low.
  • the circuit also manages with relatively low capacitance values in the DC link. Inexpensive film capacitors can therefore be used as the intermediate circuit capacitor.
  • the harmonic filter circuit consisting of the two diodes and the two capacitors can be implemented inexpensively in a small space, since film capacitors can also be used as capacitors, which also (compared to electrolytic capacitors) have a higher "long-term temperature stability".
  • the harmonic filter circuit also enables the coupling capacitor to be saved in series with the resonance inductance in the series resonant circuit, since the further capacitor of the harmonic filter circuit, in parallel with the diodes, also takes on the task of the coupling capacitor.
  • the circuit arrangement additionally has a harmonic filter circuit 5, two diodes D1, D2 being connected in series and in the direct current blocking direction in the connection between the positive pole of the mains rectifier 2 and the second electrode E2 of the low-pressure discharge lamp LP1.
  • the tap M2 is connected between the two diodes D1, D2 via a capacitor C1 to the negative pole of the mains rectifier 2 and a further capacitor C2 is connected in parallel with the two diodes D1, D2.
  • FIG. 2 shows the exact circuit diagram of the circuit arrangement according to the invention with harmonic filter circuit for operating a low-pressure discharge lamp in accordance with the block diagram in FIG. 1.
  • a filter choke FD1, FD2 and a resistor R1 are connected to each supply line in parallel to the filter choke FD1.
  • the mains rectifier with diodes D3 to D6 follows this high-frequency filter.
  • the self-controlling half-bridge circuit consists of the two transistors T1, T2, the series resistors R3 to R6, the control transformer and the starting generator with the resistors R2, R7, the starting capacitor C4, the diode D7 and the diac DC.
  • the control transformer works on the feedback principle and is made up of the primary winding RKA and the two secondary windings RKB and RKC.
  • the lamp LP1 is connected with a connection of the electrode E1 to the center tap M1 between the two transistors T1, T2 and with a connection of the other electrode E2 to the positive pole of the mains rectifier.
  • a series resonance circuit comprising resonance inductance L1 and resonance capacitor C6 is provided, resonance inductance L1 being connected between the primary winding RKA of the control transformer and the corresponding connection of electrode E1 and resonance capacitor C6 between the connections of electrodes E1 and E2 on the heating circuit side.
  • An intermediate circuit capacitor C3 is also located parallel to the switching paths of the transistors T1, T2.
  • the capacitor C5 in parallel Switching path of transistor T1 is used for radio interference suppression (trapezoidal capacitor).
  • a PTC thermistor R8 is connected in parallel with the resonance capacitor C6 in order to improve the preheating.
  • the additional harmonic filter circuit consists of two diodes D1, D2, which are connected in series and in the DC blocking direction between the positive pole of the mains rectifier and the corresponding connection of the electrode E2 of the low-pressure discharge lamp LP1.
  • the tap M2 between the two diodes D1, D2 is connected via a capacitor C1 to the negative pole of the mains rectifier.
  • a further capacitor C2 is connected in parallel with the diodes D1, D2.
  • the diode D2 ensures that the capacitor C1, which acts as a backup capacitor, is charged via the lamp circuit.
  • the charge of the backup capacitor C1 is passed via the diode D1 to the DC link and now together with the charge of the DC link capacitor C3 ensures that there is a sufficiently high supply voltage to keep the half-bridge circuit in operation even when the AC line voltage crosses zero.
  • the further capacitor C2 has the task of enabling the lamp current in the negative direction and at the same time acts as a coupling capacitor.
  • the circuitry of the lamps with the circuit arrangement is by a circuitry as shown in box A 'of FIG , to replace.
  • the electrode E1 'of the first lamp LP1' is also connected to the center tap M1, while the second electrode E4 'of the second lamp LP2' is connected to the positive pole.
  • a resonance capacitor C6 'or C6''and a PTC thermistor R8' or R8 '' are connected in parallel to each lamp LP1 ', LP2'.
  • the circuit list below shows the circuit elements used for a circuit arrangement according to FIG. 2 for operating an 8 W fluorescent lamp LP1 on 230 V AC voltage: FD1, FD2 1.5 mH, BC D3 - D6 Rectifier bridge circuit B250 C800 D1, D2, D7 1N4005 C1 1 ⁇ F C2, C3 0.22 ⁇ F C4 0.1 ⁇ F C5 1.5 nF C6 3.3 nF DC Diac 1N413M R1 10 k ⁇ R2, R7 820 k ⁇ R3, R4 22 ⁇ R5, R6 1 ⁇ R8 PTC-C890 PTC thermistor RKA 5 turns RKB, RKC 3 turns L1 3.5 mH, EF16 T1, T2 BUD 93

Abstract

The circuit arrangement includes a mains rectifier (2) with its DC output connected in parallel with an intermediate capacitor (C3) and a half-bridge circuit (3), driving circuit and resonance choke. The connection to the first electrode (E1) of the lamp (LP1) or series of lamps is taken from the centre tap (M1) of the half-bridge. The other lamp connection (E2) connects to the plus or minus pole of the rectifier via two diodes (D1,D2), connected in series against the DC current direction. The other rectifier pole is connected via a capacitor (C1) to the tap (M2) between the two diodes. A further capacitor (C2) is connected in parallel with the two diodes, with C1/C2 at least 4.

Description

Die Erfindung betrifft eine Schaltungsanordnung zum hochfrequenten Betrieb einer oder mehrerer in Reihe zueinander geschalteter niederwattiger Niederdruckentladungslampen gemäß dem Oberbegriff des Anspruchs 1.The invention relates to a circuit arrangement for the high-frequency operation of one or more low-wattage low-pressure discharge lamps connected in series with one another in accordance with the preamble of claim 1.

Der Nachteil dieser Schaltungsanordnung ist, daß durch die Halbbrückenschaltung und dem bei solchen Schaltnetzteilen benötigten Zwischenkreiskondensator parallel zum Gleichstromausgang des Netzgleichrichters Oberschwingungen im Netz erzeugt werden. Dieser Netzstrom-Oberwellengehalt muß gemäß IEC-Publikation 555-2 bei Vorschaltgeräten oder Konvertern größer 25 W Leistungsaufnahme ab 1996 die Klasse C der Vorschriften und bei Kompaktlampen, Vorschaltgeräten und Adapter kleiner gleich 25 W Leistungsaufnahme ab 1998 die Klasse D der Vorschriften erfüllen.The disadvantage of this circuit arrangement is that the half-bridge circuit and the intermediate circuit capacitor required in such switching power supplies generate harmonics in the network in parallel with the DC output of the line rectifier. According to IEC publication 555-2, this mains current harmonic content must comply with class C of the regulations for ballasts or converters with a power consumption of more than 25 W from 1996 and with class D of the regulations for compact lamps, ballasts and adapters with a power consumption of less than or equal to 25 W from 1998.

Da die Größe des Zwischenkreiskondensators proportional zur Leistungsaufnahme der Lampe ist, benötigen Vorschaltgeräte für Lampen größer 25 W Zwischenkreiskondensatoren mit höheren Kapazitäten. Diese haben jedoch einen hohen Oberwellengehalt zur Folge, so daß bei diesen Lampen aktive Oberwellenfilterschaltungen in Form von aufwendigen Pumpschaltungen mit Kondensatoren und Dioden benötigt werden, um die IEC-Vorschriften der Klasse C erfüllen zu können. Eine solche Schaltungsanordnung wird z.B. in der DE-OS 36 23 749 beschrieben. Diese aktiven Schaltungen haben außerdem zusätzliche Funkstörungen zur Folge, die nur mit einem hohen Bauteileaufwand unterbunden werden können.Since the size of the DC link capacitor is proportional to the power consumption of the lamp, ballasts for lamps larger than 25 W require DC link capacitors with higher capacities. However, these result in a high harmonic content, so that active harmonic filter circuits in the form of complex pump circuits with capacitors and diodes are required for these lamps in order to be able to meet the IEC regulations of class C. Such a circuit arrangement is e.g. described in DE-OS 36 23 749. These active circuits also result in additional radio interference, which can only be prevented with a high expenditure on components.

Aufgabe der Erfindung ist es, eine Schaltungsanordnung zum Betrieb von niederwattigen Niederdruckentladungslampen, d.h. kleiner gleich 25 W zu schaffen, die den Netzstromoberwellengehalt unter den in der Klasse D der IEC-Publikationen festgelegten Höchstwerten hält. Der hierfür benötigte Schaltungsaufwand sollte möglichst Klein und kostengünstig zu realisieren sein.The object of the invention is to provide a circuit arrangement for operating low-wattage low-pressure discharge lamps, i.e. to create less than or equal to 25 W, which keeps the mains harmonic content below the maximum values specified in class D of the IEC publications. The circuitry required for this should be as small and inexpensive as possible.

Die Aufgabe wird durch die kennzeichnenden Merkmale des Anspruchs 1 gelöst. Ein weiteres vorteilhaftes Merkmal ist dem Unteranspruch zu entnehmen.The object is achieved by the characterizing features of claim 1. Another advantageous feature can be found in the subclaim.

Der erfindungsgemäße Oberwellenfilter-Schaltkreis aus zwei Dioden und zwei Kondensatoren bewirkt einen sicheren Betrieb des Halbbrückengenerators im Nulldurchgang der Netz-Sinusspannung. Der Schaltkreis arbeitet nicht aktiv wie die oben aufgeführten Pumpschaltungen, sondern passiv, so daß nur geringe Funkstörungen entstehen und der Aufwand an Bauteilen zur Funkentstörung klein gehalten werden kann. Der Schaltkreis kommt außerdem mit relativ niedrigen Kapazitätswerten im Gleichstrom-Zwischenkreis aus. Als Zwischenkreiskondensator können daher kostengünstige Folien-Kondensatoren verwendet werden.The harmonic filter circuit according to the invention consisting of two diodes and two capacitors ensures safe operation of the half-bridge generator in the zero crossing of the mains sine voltage. The circuit does not work actively like the pump circuits listed above, but passively, so that only slight radio interference occurs and the expenditure on components for radio interference suppression can be kept low. The circuit also manages with relatively low capacitance values in the DC link. Inexpensive film capacitors can therefore be used as the intermediate circuit capacitor.

Aufgrund der geringen Ladekapazität des Zwischenkreiskondensators und der erfindungsgemäßen Ankopplung einer Lampenseite bzw. der zweiten Lampenseite der letzten Lampe (bei Reihenschaltung von mehreren Niederdruckentladungslampen) an den erfindungsgemäßen Schaltkreis zur Oberwellenfilterung ergibt sich ein hoher Power-Faktor (Verhältnis von Wirkleistung zu Scheinleistung) von größer gleich 0,9.Due to the low charging capacity of the intermediate circuit capacitor and the coupling of a lamp side or the second lamp side of the last lamp according to the invention (when several low-pressure discharge lamps are connected in series) to the harmonic filter circuit according to the invention, a high power factor (ratio of active power to apparent power) of greater than or equal results 0.9.

Der Oberwellenfilter-Schaltkreis aus den zwei Dioden und den zwei Kondensatoren ist auf kleinem Raum kostengünstig zu realisieren, da als Kapazitäten ebenfalls Folien-Kondensatoren verwendet werden können, die zudem (gegenüber Elektrolyt-Kondensatoren) eine höhere "Temperatur-Langzeit-Stabilität" aufweisen.The harmonic filter circuit consisting of the two diodes and the two capacitors can be implemented inexpensively in a small space, since film capacitors can also be used as capacitors, which also (compared to electrolytic capacitors) have a higher "long-term temperature stability".

Der Oberwellenfilter-Schaltkreis ermöglicht außerdem die Einsparung des Koppelkondensators in Reihe zur Resonanzinduktivität im Serienresonanzkreis, da der weitere Kondensator des Oberwellenfilter-Schaltkreises parallel zu den Dioden die Aufgabe des Koppelkondensators mit übernimmt.The harmonic filter circuit also enables the coupling capacitor to be saved in series with the resonance inductance in the series resonant circuit, since the further capacitor of the harmonic filter circuit, in parallel with the diodes, also takes on the task of the coupling capacitor.

Die Erfindung ist anhand der nachfolgenden Figuren näher erläutert.

Figur 1
zeigt das Blockschaltbild einer Schaltungsanordnung mit Oberwellenfilter für eine niederwattige Niederdruckentladungslampe
Figur 2
zeigt das detaillierte Schaltbild einer Schaltungsanordnung gemäß Figur 1
Figur 3
zeigt das detaillierte Schaltbild der Lampenanschlüsse und Vorheizkreise für zwei in Reihe geschaltete niederwattige Niederdruckentladungslampen

Das Blockschaltbild in Figur 1 gibt den Prinzipaufbau einer erfindungsgemäßen Schaltungsanordnung für eine niederwattige Niederdruckentladungslampe wieder. Die Schaltungsanordnung beinhaltet ein Funkentstörfilter 1, einen Netzgleichrichter 2 und eine Halbbrückenschaltung 3 mit Ansteuerschaltung und Resonanzdrossel. Zwischen den Mittenabgriff M1 der beiden Transistoren der Halbbrückenschaltung 3 und dem Pluspol des Netzgleichrichters 2 ist die Niederdruckentladungslampe LP1 geschaltet, wobei parallel zur Lampe LP1 der Vorheizkreis 4 gelegt ist.The invention is explained in more detail with reference to the following figures.
Figure 1
shows the block diagram of a circuit arrangement with harmonic filter for a low wattage low pressure discharge lamp
Figure 2
shows the detailed circuit diagram of a circuit arrangement according to FIG. 1
Figure 3
shows the detailed circuit diagram of the lamp connections and preheating circuits for two low wattage discharge lamps connected in series

The block diagram in FIG. 1 shows the basic structure of a circuit arrangement according to the invention for a low-wattage low-pressure discharge lamp. The circuit arrangement includes a radio interference suppression filter 1, a mains rectifier 2 and a half-bridge circuit 3 with a control circuit and resonance choke. The low-pressure discharge lamp LP1 is connected between the center tap M1 of the two transistors of the half-bridge circuit 3 and the positive pole of the mains rectifier 2, the preheating circuit 4 being connected in parallel to the lamp LP1.

Erfindungsgemäß weist die Schaltungsanordnung zusätzlich einen Oberwellenfilter-Schaltkreis 5 auf, wobei in die Verbindung des Pluspols des Netzgleichrichters 2 mit der zweiten Elektrode E2 der Niederdruckentladungslampe LP1 zwei Dioden D1, D2 in Reihe und in Gleichstromsperrichtung geschaltet sind. Außerdem ist der Abgriff M2 zwischen den beiden Dioden D1, D2 über einen Kondensator C1 mit dem Minuspol des Netzgleichrichters 2 verbunden und parallel zu den beiden Dioden D1, D2 ein weiterer Kondensator C2 geschaltet.According to the invention, the circuit arrangement additionally has a harmonic filter circuit 5, two diodes D1, D2 being connected in series and in the direct current blocking direction in the connection between the positive pole of the mains rectifier 2 and the second electrode E2 of the low-pressure discharge lamp LP1. In addition, the tap M2 is connected between the two diodes D1, D2 via a capacitor C1 to the negative pole of the mains rectifier 2 and a further capacitor C2 is connected in parallel with the two diodes D1, D2.

Figur 2 zeigt das genaue Schaltbild der erfindungsgemäßen Schaltungsanordnung mit Oberwellenfilter-Schaltkreis zum Betrieb einer Niederdruckentladungslampe gemäß dem Blockschaltbild in Figur 1. Direkt an den Netzeingang ist in jede Zuleitung eine Filterdrossel FD1, FD2 sowie parallel zur Filterdrossel FD1 ein Widerstand R1 geschaltet. Diesem Hochfrequenzfilter folgt der Netzgleichrichter mit den Dioden D3 bis D6. Die selbststeuernde Halbbrückenschaltung besteht aus den beiden Transistoren T1, T2, den Vorschaltwiderständen R3 bis R6, dem Steuerübertrager und dem Anlaufgenerator mit den Widerständen R2, R7, dem Startkondensator C4, der Diode D7 sowie dem Diac DC. Der Steuerübertrager arbeitet nach dem Rückkopplungsprinzip und setzt sich aus der Primärwicklung RKA sowie den beiden Sekundärwicklungen RKB und RKC zusammen. Die Lampe LP1 ist mit einem Anschluß der Elektrode E1 mit dem Mittenabgriff M1 zwischen den beiden Transistoren T1, T2 und mit einem Anschluß der anderen Elektrode E2 mit dem Pluspol des Netzgleichrichters verbunden. Außerdem ist ein Serienresonanzkreis aus Resonanzinduktivität L1 und Resonanzkondensator C6 vorgesehen, wobei die Resonanzinduktivität L1 zwischen die Primärwicklung RKA des Steuerübertragers und den entsprechenden Anschluß der Elektrode E1 und der Resonanzkondensator C6 zwischen die auf der Heizkreisseite liegenden Anschlüsse der Elektroden E1 und E2 geschaltet sind. Parallel zu den Schaltstrecken der Transistoren T1, T2 liegt außerdem ein Zwischenkreiskondensator C3. Der Kondensator C5 parallel zur Schaltstrecke des Transistors T1 dient zur Funkentstörung (Trapezkondensator). Außerdem ist parallel zum Resonanzkondensator C6 ein Kaltleiter R8 geschaltet, um die Vorheizung zu verbessern.FIG. 2 shows the exact circuit diagram of the circuit arrangement according to the invention with harmonic filter circuit for operating a low-pressure discharge lamp in accordance with the block diagram in FIG. 1. A filter choke FD1, FD2 and a resistor R1 are connected to each supply line in parallel to the filter choke FD1. The mains rectifier with diodes D3 to D6 follows this high-frequency filter. The self-controlling half-bridge circuit consists of the two transistors T1, T2, the series resistors R3 to R6, the control transformer and the starting generator with the resistors R2, R7, the starting capacitor C4, the diode D7 and the diac DC. The control transformer works on the feedback principle and is made up of the primary winding RKA and the two secondary windings RKB and RKC. The lamp LP1 is connected with a connection of the electrode E1 to the center tap M1 between the two transistors T1, T2 and with a connection of the other electrode E2 to the positive pole of the mains rectifier. In addition, a series resonance circuit comprising resonance inductance L1 and resonance capacitor C6 is provided, resonance inductance L1 being connected between the primary winding RKA of the control transformer and the corresponding connection of electrode E1 and resonance capacitor C6 between the connections of electrodes E1 and E2 on the heating circuit side. An intermediate circuit capacitor C3 is also located parallel to the switching paths of the transistors T1, T2. The capacitor C5 in parallel Switching path of transistor T1 is used for radio interference suppression (trapezoidal capacitor). In addition, a PTC thermistor R8 is connected in parallel with the resonance capacitor C6 in order to improve the preheating.

Die Funktionsweise einer solchen Schaltungsanordnung mit Halbbrückenschaltung und Serienresonanzkreis zum Zünden und Betrieb einer Niederdruckentladungslampe kann dem Buch "Elektronikschaltungen" von W. Hirschmann (SIEMENS AG) 1982, Seite 148, entnommen werden und soll hier nicht näher ausgeführt werden.The mode of operation of such a circuit arrangement with a half-bridge circuit and a series resonant circuit for igniting and operating a low-pressure discharge lamp can be found in the book "Electronics Circuits" by W. Hirschmann (SIEMENS AG) 1982, page 148, and is not to be described in more detail here.

Der zusätzliche Oberwellenfilter-Schaltkreis besteht aus zwei Dioden D1, D2, die in Reihe und in Gleichstromsperrichtung zwischen den Pluspol des Netzgleichrichters und den entsprechenden Anschluß der Elektrode E2 der Niederdruckentladungslampe LP1 geschaltet sind. Der Abgriff M2 zwischen den beiden Dioden D1, D2 ist über einen Kondensator C1 mit dem Minuspol des Netzgleichrichters verbunden. Außerdem ist parallel zu den Dioden D1, D2 ein weiterer Kondensator C2 geschaltet.The additional harmonic filter circuit consists of two diodes D1, D2, which are connected in series and in the DC blocking direction between the positive pole of the mains rectifier and the corresponding connection of the electrode E2 of the low-pressure discharge lamp LP1. The tap M2 between the two diodes D1, D2 is connected via a capacitor C1 to the negative pole of the mains rectifier. In addition, a further capacitor C2 is connected in parallel with the diodes D1, D2.

Die Diode D2 sorgt für eine Ladung des als Stützkondensator wirkenden Kondensators C1 über den Lampenstromkreis. Die Ladung des Stützkondensators C1 wird über die Diode D1 auf den Gleichstrom-Zwischenkreis geleitet und sorgt nun zusammen mit der Ladung des Zwischenkreiskondensators C3 dafür, daß auch bei Nulldurchgang der Netzwechselspannung eine ausreichend hohe Versorgungsspannung vorliegt, um die Halbbrückenschaltung in Betrieb zu halten. Der weitere Kondensator C2 hat die Aufgabe den Lampenstrom in negativer Richtung zu ermöglichen und wirkt zugleich als Koppelkondensator.The diode D2 ensures that the capacitor C1, which acts as a backup capacitor, is charged via the lamp circuit. The charge of the backup capacitor C1 is passed via the diode D1 to the DC link and now together with the charge of the DC link capacitor C3 ensures that there is a sufficiently high supply voltage to keep the half-bridge circuit in operation even when the AC line voltage crosses zero. The further capacitor C2 has the task of enabling the lamp current in the negative direction and at the same time acts as a coupling capacitor.

Im Falle von zwei in Reihe geschalteten Niederdruckentladungslampen LP1', LP2' anstelle einer Niederdruckentladungslampe ist die Verschaltung der Lampen mit der Schaltungsanordnung, wie in dem gestrichelten Kästchen A in Figur 2 gezeigt, durch eine Verschaltung, wie in dem Kästchen A' der Figur 3 dargestellt, zu ersetzen. Die Elektrode E1' der ersten Lampe LP1' ist weiterhin mit dem Mittenabgriff M1 verbunden, während die zweite Elektrode E4' der zweiten Lampe LP2' mit dem Pluspol verbunden ist. Parallel zu jeder Lampe LP1', LP2' ist je ein Resonanzkondensator C6' bzw. C6'' und ein Kaltleiter R8' bzw R8'' geschaltet.In the case of two low-pressure discharge lamps LP1 ', LP2' connected in series instead of a low-pressure discharge lamp, the circuitry of the lamps with the circuit arrangement, as shown in dashed box A in FIG. 2, is by a circuitry as shown in box A 'of FIG , to replace. The electrode E1 'of the first lamp LP1' is also connected to the center tap M1, while the second electrode E4 'of the second lamp LP2' is connected to the positive pole. A resonance capacitor C6 'or C6''and a PTC thermistor R8' or R8 '' are connected in parallel to each lamp LP1 ', LP2'.

In der nachfolgenden Bestückungsliste sind die verwendeten Schaltungselemente für eine Schaltungsanordnung gemäß Figur 2 zum Betrieb einer 8 W-Leuchtstofflampe LP1 an 230 V-Wechselspannung zusammengestellt: FD1, FD2 1,5 mH, BC D3 - D6 Gleichrichter-Brückenschältung B250 C800 D1, D2, D7 1N4005 C1 1 µF C2, C3 0,22 µF C4 0,1 µF C5 1,5 nF C6 3,3 nF DC Diac 1N413M R1 10 kΩ R2, R7 820 kΩ R3, R4 22 Ω R5, R6 1 Ω R8 Kaltleiter PTC-C890 RKA 5 Windungen RKB, RKC 3 Windungen L1 3,5 mH, EF16 T1,T2 BUD 93 The circuit list below shows the circuit elements used for a circuit arrangement according to FIG. 2 for operating an 8 W fluorescent lamp LP1 on 230 V AC voltage: FD1, FD2 1.5 mH, BC D3 - D6 Rectifier bridge circuit B250 C800 D1, D2, D7 1N4005 C1 1 µF C2, C3 0.22 µF C4 0.1 µF C5 1.5 nF C6 3.3 nF DC Diac 1N413M R1 10 kΩ R2, R7 820 kΩ R3, R4 22 Ω R5, R6 1 Ω R8 PTC-C890 PTC thermistor RKA 5 turns RKB, RKC 3 turns L1 3.5 mH, EF16 T1, T2 BUD 93

Claims (2)

Schaltungsanordnung zum hochfrequenten Betrieb einer oder mehrerer in Reihe zueinander geschalteter niederwattiger Niederdruckentladungslampen (LP1; LP1' LP2') an einer Wechselspannungsquelle, wobei die Schaltungsanordnung folgende Merkmale aufweist: - einen Netzgleichrichter (2) mit parallel zum Gleichstromausgang geschaltetem Zwischenkreiskondensator (C3) - eine an den Gleichstromausgang des Netzgleichrichters (2) angeschlossene Halbbrückenschaltung (3) mit zwei alternierend schaltenden Transistoren (T1, T2) und einer Ansteuerschaltung, wobei ein Mittenabgriff (M1) zwischen den beiden Transistoren (T1, T2) vorgesehen ist - einen den Niederdruckentladungslampen (LP1; LP1', LP2') zugeordneten Serienresonanzkreis, bestehend aus einer Resonanzinduktivität (L1) und einer jeder Niederdruckentladungslampe (LP1; LP1', LP2') zugeordneten Resonanzkapazität (C6; C6', C6'') - Anschlußleitungen für die Niederdruckentladungslampen (LP1; LP1', LP2'), wobei eine Leitung die erste Elektrode (E1, E1') der Lampe (LP1) bzw. der ersten Lampe (LP1') über die Resonanzinduktivität (L1) mit dem Mittenabgriff (M1) zwischen den beiden Transistoren (T1, T2) und jeweils eine weitere Leitung die zweite Elektrode (E2, E4') der Lampe (LP1) bzw. der letzten Lampe (LP2') mit dem Plus- oder Minuspol des Netzgleichrichters (2) verbindet dadurch gekennzeichnet, daß - in die Anschlußleitung der zweiten Elektrode (E2, E4') der Lampe (LP1) bzw. der letzten Lampe (LP2') mit dem Plus- oder Minuspol des Netzgleichrichters (2) zwei Dioden (D1, D2) in Reihe und in Gleichstromsperrichtung geschaltet sind - der Abgriff (M2) zwischen den beiden Dioden (D1, D2) über einen Kondensator (C1) mit dem anderen Pol des Netzgleichrichters (2) verbunden ist und - parallel zu den beiden Dioden (D1, D2) ein weiterer Kondensator (C2) geschaltet ist. Circuit arrangement for high-frequency operation of one or more low-wattage low-pressure discharge lamps (LP1; LP1 'LP2') connected in series with one another on an AC voltage source, the circuit arrangement having the following features: - A line rectifier (2) with an intermediate circuit capacitor (C3) connected in parallel to the DC output - A half-bridge circuit (3) connected to the direct current output of the mains rectifier (2) with two alternating switching transistors (T1, T2) and a control circuit, a center tap (M1) being provided between the two transistors (T1, T2) - A series resonance circuit assigned to the low-pressure discharge lamps (LP1; LP1 ', LP2'), consisting of a resonance inductor (L1) and a resonance capacity (C6; C6 ', C6'') assigned to each low-pressure discharge lamp (LP1; LP1', LP2 ') - Connection lines for the low-pressure discharge lamps (LP1; LP1 ', LP2'), one line being the first electrode (E1, E1 ') of the lamp (LP1) or the first lamp (LP1') via the resonance inductance (L1) with the center tap (M1) between the two transistors (T1, T2) and a further line each, the second electrode (E2, E4 ') of the lamp (LP1) or the last lamp (LP2') with the positive or negative pole of the mains rectifier (2nd ) connects characterized in that - In the connecting line of the second electrode (E2, E4 ') of the lamp (LP1) or the last lamp (LP2') with the positive or negative pole of the rectifier (2) two diodes (D1, D2) in series and in the DC blocking direction are switched - The tap (M2) between the two diodes (D1, D2) is connected via a capacitor (C1) to the other pole of the rectifier (2) and - Another capacitor (C2) is connected in parallel with the two diodes (D1, D2). Schaltungsanordnung nach Anspruch 1, dadurch gekennzeichnet, daß das Verhältnis der Kapazitäten des ersten Kondensators (C1) zum weiteren Kondensator (C2) C1/C2 ≧ 4
Figure imgb0001
 ist.Circuit arrangement according to Claim 1, characterized in that the ratio of the capacitances of the first capacitor (C1) to the further capacitor (C2) C1 / C2 ≧ 4
Figure imgb0001
 is.
EP95112518A 1994-08-26 1995-08-09 Circuit for operating low pressure discharge lamps Ceased EP0699016A3 (en)

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DE4430397A DE4430397A1 (en) 1994-08-26 1994-08-26 Circuit arrangement for operating low-pressure discharge lamps
DE4430397 1994-08-26

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WO2010027392A1 (en) * 2008-09-05 2010-03-11 Lutron Electronics Co., Inc. Electronic ballast having asymmetric resonant circuit topology
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CN110851716A (en) * 2019-11-11 2020-02-28 上海海事大学 Personalized group recommendation method based on maximum harmony
CN110851716B (en) * 2019-11-11 2022-06-24 上海海事大学 Personalized group recommendation method based on maximum harmony

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JPH0878172A (en) 1996-03-22

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