EP0679046A1 - Circuit for operating low-pressure discharge lamps - Google Patents
Circuit for operating low-pressure discharge lamps Download PDFInfo
- Publication number
- EP0679046A1 EP0679046A1 EP95103597A EP95103597A EP0679046A1 EP 0679046 A1 EP0679046 A1 EP 0679046A1 EP 95103597 A EP95103597 A EP 95103597A EP 95103597 A EP95103597 A EP 95103597A EP 0679046 A1 EP0679046 A1 EP 0679046A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- capacitor
- circuit
- diodes
- inverter
- circuit arrangement
- 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
- 239000003990 capacitor Substances 0.000 claims abstract description 80
- 238000009499 grossing Methods 0.000 claims description 32
- 230000008878 coupling Effects 0.000 claims description 9
- 238000010168 coupling process Methods 0.000 claims description 9
- 238000005859 coupling reaction Methods 0.000 claims description 9
- 238000010438 heat treatment Methods 0.000 claims description 6
- 230000002159 abnormal effect Effects 0.000 claims description 3
- 230000033764 rhythmic process Effects 0.000 description 3
- 238000004804 winding Methods 0.000 description 3
- 230000032683 aging Effects 0.000 description 2
- 230000033228 biological regulation Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 230000005540 biological transmission Effects 0.000 description 1
- 230000000903 blocking effect Effects 0.000 description 1
- 239000002800 charge carrier Substances 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 230000006378 damage Effects 0.000 description 1
- 230000002950 deficient Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000010355 oscillation Effects 0.000 description 1
- 230000001629 suppression Effects 0.000 description 1
- 230000003313 weakening effect Effects 0.000 description 1
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
-
- 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
- H05B45/00—Circuit arrangements for operating light-emitting diodes [LED]
- H05B45/30—Driver circuits
- H05B45/355—Power factor correction [PFC]; Reactive power compensation
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10S315/00—Electric lamp and discharge devices: systems
- Y10S315/07—Starting and control circuits for gas discharge lamp using transistors
Definitions
- the invention relates to a circuit arrangement for operating low-pressure discharge lamps according to the preamble of claim 1.
- the high-frequency operation of low-pressure discharge lamps compared to lamp operation at the mains frequency enables a significant reduction in the operating device dimensions and improved operating conditions for the lamps, e.g. B. better ignition behavior, no flickering and higher luminous efficacy, but on the other hand requires a higher amount of circuitry to ensure sufficient radio interference suppression and a sinusoidal mains current draw with a power factor close to one.
- a circuit arrangement corresponding to the preamble of claim 1 is disclosed, for example, in European Patent EP 0 372 303. It contains a half-bridge inverter with two alternating switching transistors, to the center tap of which a series resonance circuit, consisting of resonance inductance, coupling capacitor and resonance capacitance, is connected. A low-pressure discharge lamp is also integrated in the series resonant circuit.
- this circuit has an active harmonic filter, which ensures a sinusoidal mains current draw that meets the IEC regulations.
- This harmonic filter is formed by four diodes which are connected to one another like a bridge rectifier and are integrated into the circuit in the forward DC direction between the DC voltage output of the mains voltage rectifier and the positive pole of the smoothing capacitor feeding the inverter.
- the four diodes of the harmonic filter interrupt the charge transport to the smoothing capacitor in the switching cycle of the inverter.
- the diodes are controlled via the center tap between the diodes connected in series.
- the center tap of a first pair of diodes is here on the one hand via a pump capacitor directly to the center tap of the half-bridge inverter and on the other hand via another pump capacitor between the resonance inductance and the coupling capacitor led to a tap in the series resonance circuit, while the center tap of the second pair of diodes is connected to a tap in the series resonance circuit via a DC isolating capacitor and an inductor.
- the circuit arrangement according to the invention contains an inverter with a downstream LC output circuit, in which a low-pressure discharge lamp is integrated.
- the inverter is supplied with DC voltage via a high-frequency filter, a line voltage rectifier and a smoothing capacitor located parallel to the DC voltage output of the line voltage rectifier.
- a high-frequency bridge rectifier consisting of two series circuits of two diodes each, is integrated in the circuit in the forward DC direction.
- the circuit arrangement according to the invention has a storage choke which is inserted into the circuit between the positive pole of the DC voltage output of the mains voltage rectifier and the input of the high-frequency bridge rectifier.
- the center tap between the first two diodes connected in series is connected to a first lamp electrode via a negative feedback capacitance, while the center tap between the two second diodes connected in series is connected to the second lamp electrode and to the negative pole of the smoothing capacitor via a backup capacitor.
- This inventive connection of the storage choke and the high-frequency bridge rectifier makes a sinusoidal shape that meets the IEC regulations Grid current draw and a grid power factor greater than 0.98 reached.
- the storage choke at the input of the high-frequency bridge rectifier also exerts a step-up effect, so that the circuit arrangement according to the invention is particularly suitable for operating low-pressure discharge lamps with a comparatively high operating voltage, for. B., for the operation of miniature fluorescent lamps and fluorescent lamps with a sharp increase in the operating voltage during the aging process, is suitable.
- the circuit arrangement according to the invention also has a capacitor which is connected in parallel with the DC voltage output of the mains voltage rectifier and which, together with the storage inductor, forms a low-pass filter.
- This low-pass filter enables a further weakening of the high-frequency voltage components on the network connection side of the circuit arrangement.
- the lamp electrodes designed as preheatable filaments are advantageously integrated into the LC output circuit of the inverter in such a way that, after the low-pressure discharge lamp has been ignited, a heating current does not flow through it, which would also burden the electrode filaments in addition to the current over the discharge path .
- the circuit arrangement according to the invention is also suitable for operating miniature fluorescent lamps, the electrodes of which are exposed to a particularly high thermal load during operation, since these lamps have a significantly higher power density than T8 or T10 fluorescent lamps.
- FIG. 2 shows a detailed circuit diagram of a particularly preferred embodiment of the circuit arrangement according to the invention.
- the main component of this circuit is a self-oscillating, current-feedback half-bridge inverter with two alternating switching transistors T1, T2, which receives its supply voltage from the smoothing capacitor C2 connected in parallel with its input.
- the smoothing capacitor C2 is fed via a radio interference filter FI and a rectifier GL with an output capacitor C1 connected in parallel with its DC voltage output and the high-frequency rectifier bridge D1, D2, D3, D4.
- An LC output circuit in particular a series resonance circuit, consisting of a resonance inductance LR, a coupling capacitor CK and a resonance capacitance CR, is connected to the center tap of the switching transistors T1, T2.
- the primary winding RKA of a toroidal transformer is integrated in the series resonant circuit.
- a T2 miniature fluorescent lamp L with a power consumption of 13 watts is connected in parallel with the resonance capacity CR.
- the synonym "T2" means that the fluorescent lamp L has a diameter (perpendicular to the discharge path) of approximately 2/8 inches (approximately 7 mm).
- the lamp electrodes E1, E2, which are designed as filaments, are each connected to one another by their second connection via a Sidac SI and a PTC thermistor R. Together with these components, they form a heating circuit lying parallel to the resonance capacitance CR, which enables the electrode filaments E1, E2 to be preheated before the lamp is ignited.
- the Sidac SI interrupts the heating circuit, so that the PTC thermistor R is switched out of the LC output circuit of the inverter.
- the discharge path of the fluorescent lamp L is connected in parallel to the resonance capacitance CR and in parallel to the series connection of Sidac SI and PTC thermistor R.
- the series resonance circuit of the half-bridge inverter T1, T2, consisting of the components RKA, LR, CK and CR, is closed via a backup capacitor CS, the one terminal is connected to the resonance capacitance CR and the first terminal of the lamp electrode E2, and the other terminal of which is connected to the negative pole of the smoothing capacitor C2 and to the negative output of the mains voltage rectifier GL.
- the electrode filaments E1, E2 of the lamp L are therefore not integrated in the series resonant circuit and are therefore only flowed through by the discharge current after the lamp has ignited.
- the primary winding RKA of the toroidal core transformer controls the switching behavior of the transistors T1, T2 via the secondary winding RKB or RKC integrated in the respective base circuit of the transistors T1, T2 and the base series resistors R1, R4.
- the transistor half-bridge also includes the emitter resistors R3, R6, the resistors R2, R5 connected in parallel with the base-emitter path and the only schematically illustrated start circuit ST, which triggers the oscillation of the inverter.
- a detailed description of the mode of operation of the half-bridge inverter, including the start circuit ST, can be found, for example, in the book "Switching Power Supplies" by W. Hirschmann / A. Hauenstein, ed. Siemens AG, 1990 edition, on page 63.
- the resistors R2 and R5 merely improve the switching behavior of the transistors T1, T2 in that they enable the charge carriers to be removed more quickly from the space charge zone of the base-emitter boundary layer.
- Another main component of the circuit arrangement according to the invention is the high-frequency rectifier bridge, consisting of the diodes D1, D2, D3, D4, which is integrated in the circuit in the forward DC direction between the positive output of the mains voltage rectifier GL and the positive pole of the smoothing capacitor C2.
- the diodes D1 and D2, like the diodes D3 and D4, are connected in series with one another.
- the diode pair D1, D2 is arranged parallel to the diode pair D3, D4.
- the anode connections of the diodes D1, D3 are connected via a storage choke L1 to the positive output of the mains voltage rectifier GL.
- the cathode connections of the diodes D2, D4 are connected to the positive pole of the smoothing capacitor C2 and to the collector of the transistor T1.
- the center tap between the diodes D1, D2 is connected to a connection of the coupling capacitor CK and the resonance capacitance CR as well as to the first connection of the electrode coil E1 via a negative feedback capacitor CG.
- the center tap between the diodes D3, D4 is connected on the one hand directly to the connection point of the resonance capacitance CR and the electrode coil E2 and on the other hand via the support capacitor CS to the negative pole of the smoothing capacitor C2 and to connected to the negative output of the mains voltage rectifier GL.
- a diode D5 is connected in parallel with the support capacitor CS and clamps the negative components of the support capacitor voltage to the negative pole of the smoothing capacitor C2.
- the high-frequency rectifier bridge interrupts the charging of the smoothing capacitor C2 in the switching rhythm of the half-bridge inverter.
- the circuit arrangement according to the invention has a safety shutdown which switches off the inverter in the event of a defective lamp or in the event of an abnormal operating state.
- An essential component of this safety shutdown is a thyristor TH, the control electrode of which is controlled by a diac DI.
- the thyristor TH is connected on the one hand via an ohmic holding resistor R10 to the collector of the transistor T1 and on the other hand to the negative pole of the smoothing capacitor C2.
- the control electrode of the thyristor TH is connected via the diac DI and an electrolytic capacitor C3 to the negative pole of the smoothing capacitor C2.
- the base terminal of the transistor T1 is connected to the anode of the thyristor TH via a diode D6 and an ohmic resistor R7. Voltage dividing resistors R15, R16, R17 are connected in parallel with the smoothing capacitor C2. The center tap between the resistors R15 and R16 is connected to the positive pole of the electrolytic capacitor C3 via a diode D8. The center tap between the negative feedback capacitor CG, the electrode coil E1, the coupling capacitor CK and the resonance capacitance CR is connected to the negative pole of the smoothing capacitor C2 via the resistors R8, R9 and R11.
- the center tap between the resistors R9 and R11 is connected via a diode D7 to the positive pole of the electrolytic capacitor C3.
- An ohmic resistor R13 is also connected in parallel with the electrolytic capacitor C3.
- the center tap between the control electrode of the thyristor TH and the diac DI is connected via an ohmic resistor R14 to the negative pole of the smoothing capacitor C2.
- the voltage divider R15, R16, R17 detects the voltage drop across the smoothing capacitor C2. If this exceeds a predetermined critical value, the electrolytic capacitor C3 is charged via the diode D8 to the breakover voltage of the diac DI and the thyristor TH turns on, so that the base of the transistor T1 is connected to the negative pole of the smoothing capacitor C2. This will Transistor T1 withdraws the control signal and the half-bridge inverter is switched off.
- the voltage divider R8, R9, R11 detects the ignition or operating voltage of the miniature fluorescent lamp L.
- the electrolytic capacitor C3 is also switched to the breakover voltage of the diac via the diode D7 DI charged so that the thyristor TH turns on and the control signal is withdrawn from the transistor T1.
- the resistor R13 and the electrolytic capacitor C3 define a time constant so that the thyristor TH is not activated during the ignition phase of the lamp L.
- Table 1 A suitable dimensioning of the electrical components of the exemplary embodiment described in more detail above is given in Table 1.
- Table 1 R1, R4 10 ⁇ R2, R5 82 ⁇ R3, R6 0.56 ⁇ R7 100 ⁇ R8, R9, R16, R17 500 k ⁇ R10 68 k ⁇ R11 82 k ⁇ R13 1 M ⁇ R14 1 k ⁇ R15 47 k ⁇ C1 47 nF C2 4.7 ⁇ F C3 2.2 ⁇ F CS 4.7 nF CK 68 nF CR 2.2 nF CG 1 nF L1 1.5 mH LR 4.5 mH
- RKA RKB: RKC 7: 2: 2 turns D1 - D8 RGL34J T1, T2 BUD 620 TH C106M
Landscapes
- Circuit Arrangements For Discharge Lamps (AREA)
Abstract
Description
Die Erfindung betrifft eine Schaltungsanordnung zum Betrieb von Niederdruckentladungslampen gemäß dem Obergriff des Patentanspruchs 1.The invention relates to a circuit arrangement for operating low-pressure discharge lamps according to the preamble of claim 1.
Insbesondere handelt es sich um eine Schaltungsanordnung zum hochfrequenten Betrieb von Niederdruckentladungslampen. Einerseits ermöglicht der Hochfrequenzbetrieb von Niederdruckentladungslampen gegenüber einem Lampenbetrieb mit Netzfrequenz eine deutliche Verringerung der Betriebsgeräteabmessungen sowie verbesserte Betriebsbedingungen für die Lampen, z. B. besseres Zündverhalten, kein Flimmern und höhere Lichtausbeute, erfordert aber andererseits einen höheren Schaltungsaufwand, um eine ausreichende Funkentstörung und eine möglichst sinusförmige Netzstromentnahme mit einem Leistungsfaktor nahe bei eins zu gewährleisten.In particular, it is a circuit arrangement for the high-frequency operation of low-pressure discharge lamps. On the one hand, the high-frequency operation of low-pressure discharge lamps compared to lamp operation at the mains frequency enables a significant reduction in the operating device dimensions and improved operating conditions for the lamps, e.g. B. better ignition behavior, no flickering and higher luminous efficacy, but on the other hand requires a higher amount of circuitry to ensure sufficient radio interference suppression and a sinusoidal mains current draw with a power factor close to one.
Eine dem Oberbegriff des Patentanspruchs 1 entsprechende Schaltungsanordnung ist beispielsweise in der europäischen Patentschrift EP 0 372 303 offenbart. Sie enthält einen Halbbrückenwechselrichter mit zwei alternierend schaltenden Transistoren, an deren Mittenabgriff ein Serienresonanzkreis, bestehend aus Resonanzinduktivität, Kopplungskondensator und Resonanzkapazität, angeschlossen ist. In den Serienresonanzkreis ist ferner eine Niederdruckentladungslampe integriert. Außerdem weist diese Schaltung ein aktives Oberwellenfilter auf, das eine den IEC-Vorschriften genügende sinusförmige Netzstromentnahme gewährleistet. Dieses Oberwellenfilter wird von vier Dioden gebildet, die ähnlich einem Brückengleichrichter miteinander verschaltet sind und in Gleichstromvorwärtsrichtung zwischen dem Gleichspannungsausgang des Netzspannungsgleichrichters und dem Pluspol des den Wechselrichter speisenden Glättungskondensators in die Schaltung integriert sind. Die vier Dioden des Oberwellenfilters unterbrechen den Ladungstransport zum Glättungskondensator im Schalttakt des Wechselrichters. Die Ansteuerung der Dioden erfolgt dabei jeweils über den Mittenabgriff zwischen den in Reihe zueinander geschalteten Dioden. Der Mittenabgriff eines ersten Diodenpaares ist hier einerseits über einen Pumpkondensator direkt zum Mittenabgriff des Halbbrückenwechselrichters und andererseits über einen weiteren Pumpkondensator zwischen die Resonanzinduktivität und den Kopplungskondensator zu einem Abgriff im Serienresonanzkreis geführt, während der Mittenabgriff des zweiten Diodenpaares über einen Gleichstromtrennkondensator und eine Induktivität mit einem Abgriff im Serienresonanzkreis verbunden ist. Mit Hilfe dieser Schaltungsanordnung lassen sich eine nahezu sinusförmige Netzstromentnahme und ein Netzleistungsfaktor größer als 0,9 erreichen.A circuit arrangement corresponding to the preamble of claim 1 is disclosed, for example, in European Patent EP 0 372 303. It contains a half-bridge inverter with two alternating switching transistors, to the center tap of which a series resonance circuit, consisting of resonance inductance, coupling capacitor and resonance capacitance, is connected. A low-pressure discharge lamp is also integrated in the series resonant circuit. In addition, this circuit has an active harmonic filter, which ensures a sinusoidal mains current draw that meets the IEC regulations. This harmonic filter is formed by four diodes which are connected to one another like a bridge rectifier and are integrated into the circuit in the forward DC direction between the DC voltage output of the mains voltage rectifier and the positive pole of the smoothing capacitor feeding the inverter. The four diodes of the harmonic filter interrupt the charge transport to the smoothing capacitor in the switching cycle of the inverter. The diodes are controlled via the center tap between the diodes connected in series. The center tap of a first pair of diodes is here on the one hand via a pump capacitor directly to the center tap of the half-bridge inverter and on the other hand via another pump capacitor between the resonance inductance and the coupling capacitor led to a tap in the series resonance circuit, while the center tap of the second pair of diodes is connected to a tap in the series resonance circuit via a DC isolating capacitor and an inductor. With the aid of this circuit arrangement, an almost sinusoidal mains current draw and a mains power factor greater than 0.9 can be achieved.
Es ist die Aufgabe der Erfindung, eine Schaltungsanordnung zum Betrieb von Niederdruckentladungslampen bereitzustellen, die eine möglichst sinusförmige Netzstromentnahme gewährleistet, einen gegenüber dem Stand der Technik verbesserten Netzleistungsfaktor aufweist und die außerdem auch zum Betrieb von Niederdruckentladungslampen mit vergleichsweise hoher Betriebsspannung geeignet ist.It is the object of the invention to provide a circuit arrangement for operating low-pressure discharge lamps which ensures the most sinusoidal mains current draw possible, has a network power factor which is improved compared to the prior art and which is also suitable for operating low-pressure discharge lamps with a comparatively high operating voltage.
Diese Aufgabe wird erfindungsgemäß durch die kennzeichnenden Merkmale des Patentanspruchs 1 gelöst. Besonders bevorzugte Ausführungen der Erfindung sind in den Unteransprüchen beschrieben.This object is achieved by the characterizing features of claim 1. Particularly preferred embodiments of the invention are described in the subclaims.
Die erfindungsgemäße Schaltungsanordnung enthält einen Wechselrichter mit einem nachgeschalteten LC-Ausgangskreis, in den eine Niederdruckentladungslampe integiert ist. Der Wechselrichter wird über ein Hochfrequenzfilter, einen Netzspannungsgleichrichter und einen, parallel zum Gleichspannungsausgang des Netzspannungsgleichrichters liegenden Glättungskondensator mit Gleichspannung versorgt. Zwischen dem Gleichspannungsausgang des Netzspannungsgleichrichters und dem Pluspol des Glättungskondensators ist, in Gleichstromvorwärtsrichtung, ein Hochfrequenz-Brückengleichrichter, bestehend aus zwei parallel zueinander angeordneten Reihenschaltungen von jeweils zwei Dioden in die Schaltung integriert. Außerdem besitzt die erfindungsgemäße Schaltungsanordnung eine Speicherdrossel, die zwischen dem Pluspol des Gleichspannungsausganges des Netzspannungsgleichrichters und dem Eingang des Hochfrequenz-Brückengleichrichters in die Schaltung eingefügt ist. Der Mittenabgriff zwischen den beiden ersten in Reihe geschalteten Dioden ist über eine Gegenkopplungskapazität mit einer ersten Lampenelektrode verbunden, während der Mittenabgriff zwischen den beiden zweiten in Reihe geschalteten Dioden an die zweite Lampenelektrode sowie über einen Stützkondensator an den Minuspol des Glättungskondensators angeschlossen.The circuit arrangement according to the invention contains an inverter with a downstream LC output circuit, in which a low-pressure discharge lamp is integrated. The inverter is supplied with DC voltage via a high-frequency filter, a line voltage rectifier and a smoothing capacitor located parallel to the DC voltage output of the line voltage rectifier. Between the DC voltage output of the mains voltage rectifier and the positive pole of the smoothing capacitor, a high-frequency bridge rectifier, consisting of two series circuits of two diodes each, is integrated in the circuit in the forward DC direction. In addition, the circuit arrangement according to the invention has a storage choke which is inserted into the circuit between the positive pole of the DC voltage output of the mains voltage rectifier and the input of the high-frequency bridge rectifier. The center tap between the first two diodes connected in series is connected to a first lamp electrode via a negative feedback capacitance, while the center tap between the two second diodes connected in series is connected to the second lamp electrode and to the negative pole of the smoothing capacitor via a backup capacitor.
Durch diese erfindungsgemäße Verschaltung der Speicherdrossel und des Hochfrequenz-Brückengleichrichters werden eine den IEC-Vorschriften genügende sinusförmige Netzstromentnahme und ein Netzleistungsfaktor größer als 0,98 erreicht. Die Speicherdrossel am Eingang des Hochfrequenz-Brückengleichrichters übt außerdem eine hochsetzstellende Wirkung aus, so daß sich die erfindungsgemäße Schaltungsanordnung besonders zum Betrieb von Niederdruckentladungslampen mit vergleichsweise hoher Betriebsspannung, z. B., zum Betrieb von Miniaturleuchtstofflampen und Leuchtstofflampen mit starkem Anstieg der Betriebsspannung während des Alterungsprozesses, eignet.This inventive connection of the storage choke and the high-frequency bridge rectifier makes a sinusoidal shape that meets the IEC regulations Grid current draw and a grid power factor greater than 0.98 reached. The storage choke at the input of the high-frequency bridge rectifier also exerts a step-up effect, so that the circuit arrangement according to the invention is particularly suitable for operating low-pressure discharge lamps with a comparatively high operating voltage, for. B., for the operation of miniature fluorescent lamps and fluorescent lamps with a sharp increase in the operating voltage during the aging process, is suitable.
Bei einem bevorzugten Ausführungsbeispiel besitzt die erfindungsgemäße Schaltungsanordnung ferner einen parallel zum Gleichspannungsausgang des Netzspannungsgleichrichters geschalteten Kondensator, der zusammen mit der Speicherdrossel einen Tiefpaß bildet. Dieser Tiefpaß ermöglicht eine weitere Abschwächung der hochfrequenten Spannungsanteile auf der Netzanschlußseite der Schaltungsanordnung.In a preferred exemplary embodiment, the circuit arrangement according to the invention also has a capacitor which is connected in parallel with the DC voltage output of the mains voltage rectifier and which, together with the storage inductor, forms a low-pass filter. This low-pass filter enables a further weakening of the high-frequency voltage components on the network connection side of the circuit arrangement.
Außerdem sind bei dem bevorzugten Ausführungsbeispiel die als vorheizbare Wendeln ausgebildeten Lampenelektroden vorteilhafterweise derart in den LC-Ausgangskreis des Wechselrichters integriert, daß die Elektrodenwendeln nach erfolgter Zündung der Niederdruckentladungslampe nicht noch von einem Heizstrom durchflossen werden, der die Elektrodenwendeln zusätzlich zum Strom über die Entladungsstrecke belasten würde. Dadurch ist die erfindungsgemäße Schaltungsanordnung auch zum Betrieb von Miniaturleuchtstofflampen geeignet, deren Elektroden während des Betriebes einer besonders hohen thermischen Belastung ausgesetzt sind, da diese Lampen im Vergleich zu T8- oder T10-Leuchtstofflampen eine wesentlich höhere Leistungsdichte aufweisen.In addition, in the preferred embodiment, the lamp electrodes designed as preheatable filaments are advantageously integrated into the LC output circuit of the inverter in such a way that, after the low-pressure discharge lamp has been ignited, a heating current does not flow through it, which would also burden the electrode filaments in addition to the current over the discharge path . As a result, the circuit arrangement according to the invention is also suitable for operating miniature fluorescent lamps, the electrodes of which are exposed to a particularly high thermal load during operation, since these lamps have a significantly higher power density than T8 or T10 fluorescent lamps.
Nachstehend wird die Erfindung anhand eines bevorzugten Ausführungsbeispiels näher erläutert. Es zeigen:
- Figur 1
- das Prinzip der erfindungsgemäßen Schaltungsanordnung in stark schematisierter Darstellung
- Figur 2
- die Schaltungsanordnung gemäß eines bevorzugten Ausführungsbeispiels
- Figure 1
- the principle of the circuit arrangement according to the invention in a highly schematic representation
- Figure 2
- the circuit arrangement according to a preferred embodiment
Figur 2 zeigt ein detailliertes Schaltbild eines besonders bevorzugten Ausführungsbeispiels der erfindungsgemäßen Schaltungsanordnung. Hauptbestandteil dieser Schaltung ist ein selbstschwingender, stromrückgekoppelter Halbbrückenwechselrichter mit zwei alternierend schaltenden Transistoren T1, T2, der seine Versorgungsspannung von dem parallel zu seinem Eingang geschalteten Glättungskondensator C2 erhält. Der Glättungskondensator C2 wird über ein Funkentstörfilter FI und einen Gleichrichter GL mit einem parallel zu seinem Gleichspannungsausgang geschalteten Ausgangskondensator C1 und die Hochfrequenz-Gleichrichterbrücke D1, D2, D3, D4 vom Netz gespeist. Am Mittenabgriff der Schalttransistoren T1, T2 ist ein LC-Ausgangskreis, insbesondere ein Serienresonanzkreis, bestehend aus einer Resonanzinduktivität LR, einem Kopplungskondensator CK und einer Resonanzkapazität CR, angeschlossen. Außerdem ist in den Serienresonanzkreis noch die Primärwicklung RKA eines Ringkerntransformators integriert. Parallel zur Resonanzkapazität CR ist eine T2-Miniaturleuchtstofflampe L mit einer Leistungsaufnahme von 13 Watt geschaltet. Das Synonym "T2" bedeutet, daß die Leuchtstofflampe L einen Durchmesser (senkrecht zur Entladungsstrecke) von ca. 2/8 Zoll (ca. 7 mm) besitzt. Die als Wendeln ausgebildeten Lampenelektroden E1, E2 sind jeweils mit ihrem zweiten Anschluß über einen Sidac SI und einen Kaltleiter R miteinander verbunden. Sie bilden zusammen mit diesen Bauteilen einen parallel zur Resonanzkapazität CR liegenden Heizkreis, der ein Vorheizen der Elektrodenwendeln E1, E2 vor der Lampenzündung ermöglicht. Nach erfolgter Lampenzündung unterbricht der Sidac SI den Heizkreis, so daß der Kaltleiter R aus dem LC-Ausgangskreis des Wechselrichters herausgeschaltet wird. Die Entladungsstrecke der Leuchtstofflampe L ist parallel zur Resonanzkapazität CR und parallel zur Reihenschaltung aus Sidac SI und Kaltleiter R geschaltet. Geschlossen wird der aus den Bauelementen RKA, LR, CK und CR bestehende Serienresonanzkreis des Halbbrückenwechselrichters T1, T2 über einen Stützkondensator CS, dessen einer Anschluß mit der Resonanzkapazität CR und dem ersten Anschluß der Lampenelektrode E2 verbunden ist, und dessen anderer Anschluß zum Minuspol des Glättungskondensators C2 und zum negativen Ausgang des Netzspannungsgleichrichters GL geführt ist. Die Elektrodenwendeln E1, E2 der Lampe L sind also nicht in den Serienresonanzkreis integriert und werden daher nach erfolgter Lampenzündung nur vom Entladungsstrom durchflossen.Figure 2 shows a detailed circuit diagram of a particularly preferred embodiment of the circuit arrangement according to the invention. The main component of this circuit is a self-oscillating, current-feedback half-bridge inverter with two alternating switching transistors T1, T2, which receives its supply voltage from the smoothing capacitor C2 connected in parallel with its input. The smoothing capacitor C2 is fed via a radio interference filter FI and a rectifier GL with an output capacitor C1 connected in parallel with its DC voltage output and the high-frequency rectifier bridge D1, D2, D3, D4. An LC output circuit, in particular a series resonance circuit, consisting of a resonance inductance LR, a coupling capacitor CK and a resonance capacitance CR, is connected to the center tap of the switching transistors T1, T2. In addition, the primary winding RKA of a toroidal transformer is integrated in the series resonant circuit. A T2 miniature fluorescent lamp L with a power consumption of 13 watts is connected in parallel with the resonance capacity CR. The synonym "T2" means that the fluorescent lamp L has a diameter (perpendicular to the discharge path) of approximately 2/8 inches (approximately 7 mm). The lamp electrodes E1, E2, which are designed as filaments, are each connected to one another by their second connection via a Sidac SI and a PTC thermistor R. Together with these components, they form a heating circuit lying parallel to the resonance capacitance CR, which enables the electrode filaments E1, E2 to be preheated before the lamp is ignited. After the lamp has ignited, the Sidac SI interrupts the heating circuit, so that the PTC thermistor R is switched out of the LC output circuit of the inverter. The discharge path of the fluorescent lamp L is connected in parallel to the resonance capacitance CR and in parallel to the series connection of Sidac SI and PTC thermistor R. The series resonance circuit of the half-bridge inverter T1, T2, consisting of the components RKA, LR, CK and CR, is closed via a backup capacitor CS, the one terminal is connected to the resonance capacitance CR and the first terminal of the lamp electrode E2, and the other terminal of which is connected to the negative pole of the smoothing capacitor C2 and to the negative output of the mains voltage rectifier GL. The electrode filaments E1, E2 of the lamp L are therefore not integrated in the series resonant circuit and are therefore only flowed through by the discharge current after the lamp has ignited.
Die Primärwicklung RKA des Ringkerntransformators steuert das Schaltverhalten der Transistoren T1, T2 über die in den jeweiligen Basiskreis der Transistoren T1, T2 integrierte Sekundärwicklung RKB bzw. RKC und die Basisvorwiderstände R1, R4. Zur Transistorhalbbrücke gehören ferner noch die Emitterwiderstände R3, R6, die parallel zur Basis-Emitter-Strecke geschalteten Widerstände R2, R5 und die nur schematisch dargestellte Startschaltung ST, die das Anschwingen des Wechselrichters auslöst. Eine ausführliche Beschreibung der Funktionsweise des Halbbrückenwechselrichters, einschließlich der Startschaltung ST, findet man beispielsweise in dem Buch "Schaltnetzteile" von W. Hirschmann/ A. Hauenstein, Hrsg. Siemens AG, Ausgabe 1990 auf der Seite 63. Die Widerstände R2 und R5 verbessern lediglich das Schaltverhalten der Transistoren T1, T2, indem sie ein schnelleres Ausräumen der Ladungsträger aus der Raumladungszone der Basis-Emitter-Grenzschicht ermöglichen.The primary winding RKA of the toroidal core transformer controls the switching behavior of the transistors T1, T2 via the secondary winding RKB or RKC integrated in the respective base circuit of the transistors T1, T2 and the base series resistors R1, R4. The transistor half-bridge also includes the emitter resistors R3, R6, the resistors R2, R5 connected in parallel with the base-emitter path and the only schematically illustrated start circuit ST, which triggers the oscillation of the inverter. A detailed description of the mode of operation of the half-bridge inverter, including the start circuit ST, can be found, for example, in the book "Switching Power Supplies" by W. Hirschmann / A. Hauenstein, ed. Siemens AG, 1990 edition, on page 63. The resistors R2 and R5 merely improve the switching behavior of the transistors T1, T2 in that they enable the charge carriers to be removed more quickly from the space charge zone of the base-emitter boundary layer.
Ein weiterer Hauptbestandteil der erfindungsgemäßen Schaltungsanordnung ist die Hochfrequenz-Gleichrichterbrücke, bestehend aus den Dioden D1, D2, D3, D4, die in Gleichstromvorwärtsrichtung zwischen den postiven Ausgang des Netzspannungsgleichrichters GL und den Pluspol des Glättungskondensators C2 in die Schaltung integriert ist. Die Dioden D1 und D2 sind, ebenso wie die Dioden D3 und D4, in Reihe zueinander geschaltet. Das Diodenpaar D1, D2 ist parallel zum Diodenpaar D3, D4 angeordnet. Die Anodenanschlüsse der Dioden D1, D3 sind über eine Speicherdrossel L1 an den postiven Ausgang des Netzspannungsgleichrichters GL angeschlossen. Die Kathodenanschlüsse der Dioden D2, D4 sind mit dem Pluspol des Glättungskondensators C2 und mit dem Kollektor des Transistors T1 verbunden. Der Mittenabgriff zwischen den Dioden D1, D2 ist über einen Gegenkopplungskondensator CG jeweils mit einem Anschluß des Kopplungskondensators CK und der Resonanzkapazität CR sowie mit dem ersten Anschluß der Elektrodenwendel E1 verbunden. Der Mittenabgriff zwischen den Dioden D3, D4 ist zum einen direkt an den Verbindungspunkt von Resonanzkapazität CR und Elektrodenwendel E2 angeschlossen und zum anderen über den Stützkondensator CS mit dem Minuspol des Glättungskondensators C2 sowie mit dem negativen Ausgang des Netzspannungsgleichrichters GL verbunden. Parallel zum Stützkondensator CS ist eine Diode D5 geschaltet, die die negativen Anteile der Stützkondensatorspannung an den Minuspol des Glättungskondensators C2 klemmt. Wie bereits oben beschrieben, unterbricht die Hochfrequenz-Gleichrichterbrücke die Aufladung des Glättungskondensators C2 im Schaltrhythmus des Halbbrückenwechselrichters. Die Bauelemente mit denselben Bezugszeichen in den Figuren 1 und 2 sind identisch und haben auch dieselbe Funktion.Another main component of the circuit arrangement according to the invention is the high-frequency rectifier bridge, consisting of the diodes D1, D2, D3, D4, which is integrated in the circuit in the forward DC direction between the positive output of the mains voltage rectifier GL and the positive pole of the smoothing capacitor C2. The diodes D1 and D2, like the diodes D3 and D4, are connected in series with one another. The diode pair D1, D2 is arranged parallel to the diode pair D3, D4. The anode connections of the diodes D1, D3 are connected via a storage choke L1 to the positive output of the mains voltage rectifier GL. The cathode connections of the diodes D2, D4 are connected to the positive pole of the smoothing capacitor C2 and to the collector of the transistor T1. The center tap between the diodes D1, D2 is connected to a connection of the coupling capacitor CK and the resonance capacitance CR as well as to the first connection of the electrode coil E1 via a negative feedback capacitor CG. The center tap between the diodes D3, D4 is connected on the one hand directly to the connection point of the resonance capacitance CR and the electrode coil E2 and on the other hand via the support capacitor CS to the negative pole of the smoothing capacitor C2 and to connected to the negative output of the mains voltage rectifier GL. A diode D5 is connected in parallel with the support capacitor CS and clamps the negative components of the support capacitor voltage to the negative pole of the smoothing capacitor C2. As already described above, the high-frequency rectifier bridge interrupts the charging of the smoothing capacitor C2 in the switching rhythm of the half-bridge inverter. The components with the same reference numerals in FIGS. 1 and 2 are identical and also have the same function.
Um eine Zerstörung des Betriebsgerätes im Falle eines anomalen Betriebszustandes zu vermeiden, besitzt die erfindungsgemäße Schaltungsanordnung eine Sicherheitsabschaltung, die den Wechselrichter bei defekter Lampe oder im Falle eines anomalen Betriebszustandes abschaltet. Wesentliches Bestandteil dieser Sicherheitsabschaltung ist ein Thyristor TH, dessen Steuerelektrode über einen Diac DI angesteuert wird. Der Thyristor TH ist einerseits über einen ohmschen Haltewiderstand R10 mit dem Kollektor des Transistors T1 und andererseits mit dem Minuspol des Glättungskondensators C2 verbunden. Die Steuerelektrode des Thyristors TH ist über den Diac DI und einen Elektrolytkondensator C3 mit dem Minuspol des Glättungskondensators C2 verbunden. Der Basisanschluß des Transistors T1 ist über eine Diode D6 und einen ohmschen Widerstand R7 an die Anode des Thyristors TH angeschlossen. Parallel zum Glättungskondensator C2 sind Spannungsteilerwiderstände R15, R16, R17 geschaltet. Der Mittenabgriff zwischen den Widerständen R15 und R16 ist über eine Diode D8 mit dem Pluspol des Elektrolytkondensators C3 verbunden. Der Mittenabgriff zwischen dem Gegenkopplungskondensator CG, der Elektrodenwendel E1, dem Kopplungskondensator CK und der Resonanzkapazität CR ist über die Widerstände R8, R9 und R11 an den Minuspol des Glättungskondensators C2 angeschlossen. Der Mittenabgriff zwischen den Widerständen R9 und R11 ist über eine Diode D7 mit dem Pluspol des Elektrolytkondensators C3 verbunden. Parallel zum Elektrolytkondensator C3 ist ferner ein ohmscher Widerstand R13 geschaltet. Der mittenabgriff zwischen der Steuerelektrode des Thyristors TH und dem Diac DI ist über einen ohmschen Widerstand R14 mit dem Minuspol des Glättungskondensators C2 verbunden.In order to avoid destruction of the operating device in the event of an abnormal operating state, the circuit arrangement according to the invention has a safety shutdown which switches off the inverter in the event of a defective lamp or in the event of an abnormal operating state. An essential component of this safety shutdown is a thyristor TH, the control electrode of which is controlled by a diac DI. The thyristor TH is connected on the one hand via an ohmic holding resistor R10 to the collector of the transistor T1 and on the other hand to the negative pole of the smoothing capacitor C2. The control electrode of the thyristor TH is connected via the diac DI and an electrolytic capacitor C3 to the negative pole of the smoothing capacitor C2. The base terminal of the transistor T1 is connected to the anode of the thyristor TH via a diode D6 and an ohmic resistor R7. Voltage dividing resistors R15, R16, R17 are connected in parallel with the smoothing capacitor C2. The center tap between the resistors R15 and R16 is connected to the positive pole of the electrolytic capacitor C3 via a diode D8. The center tap between the negative feedback capacitor CG, the electrode coil E1, the coupling capacitor CK and the resonance capacitance CR is connected to the negative pole of the smoothing capacitor C2 via the resistors R8, R9 and R11. The center tap between the resistors R9 and R11 is connected via a diode D7 to the positive pole of the electrolytic capacitor C3. An ohmic resistor R13 is also connected in parallel with the electrolytic capacitor C3. The center tap between the control electrode of the thyristor TH and the diac DI is connected via an ohmic resistor R14 to the negative pole of the smoothing capacitor C2.
Der Spannungsteiler R15, R16, R17 detektiert den Spannungsabfall am Glättungskondensator C2. Übersteigt dieser einen vorgegebenen kritischen Wert, so wird der Elektrolytkondensator C3 über die Diode D8 auf die Kippspannung des Diacs DI aufgeladen und der Thyristor TH schaltet durch, so daß die Basis des Transistors T1 mit dem Minuspol des Glättungskondensators C2 verbunden ist. Dadurch wird dem Transistor T1 das Steuersignal entzogen und der Halbbrückenwechselrichter abgeschaltet. Der Spannungsteiler R8, R9, R11 detektiert die Zünd- bzw. Betriebsspannung der Miniatur-Leuchtstofflampe L. Bei nicht zündwilliger Lampe L bzw. bei zu hoher Lampenbetriebsspannung (beispielsweise alterungsbedingt), wird der Elektrolytkondensator C3 über die Diode D7 ebenfalls auf die Kippspannung des Diacs DI aufgeladen, sodaß der Thyristor TH durchschaltet und dem Transistor T1 das Steuersignal entzogen wird. Der Widerstand R13 und der Elektrolytkondensator C3 definieren eine Zeitkonstante, so daß der Thyristor TH während der Zündphase der Lampe L nicht angesteuert wird.The voltage divider R15, R16, R17 detects the voltage drop across the smoothing capacitor C2. If this exceeds a predetermined critical value, the electrolytic capacitor C3 is charged via the diode D8 to the breakover voltage of the diac DI and the thyristor TH turns on, so that the base of the transistor T1 is connected to the negative pole of the smoothing capacitor C2. This will Transistor T1 withdraws the control signal and the half-bridge inverter is switched off. The voltage divider R8, R9, R11 detects the ignition or operating voltage of the miniature fluorescent lamp L. If the lamp L does not ignite or if the lamp operating voltage is too high (for example due to aging), the electrolytic capacitor C3 is also switched to the breakover voltage of the diac via the diode D7 DI charged so that the thyristor TH turns on and the control signal is withdrawn from the transistor T1. The resistor R13 and the electrolytic capacitor C3 define a time constant so that the thyristor TH is not activated during the ignition phase of the lamp L.
Eine geeignete Dimensionierung der elektrischen Bauelemente des oben näher beschriebenen Ausführungsbeispiels ist in der Tabelle 1 angegeben.
Claims (5)
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE4410492A DE4410492A1 (en) | 1994-03-25 | 1994-03-25 | Circuit arrangement for operating low-pressure discharge lamps |
DE4410492 | 1994-03-25 |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0679046A1 true EP0679046A1 (en) | 1995-10-25 |
EP0679046B1 EP0679046B1 (en) | 1999-06-02 |
Family
ID=6513903
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP95103597A Expired - Lifetime EP0679046B1 (en) | 1994-03-25 | 1995-03-13 | Circuit for operating low-pressure discharge lamps |
Country Status (4)
Country | Link |
---|---|
US (1) | US5521467A (en) |
EP (1) | EP0679046B1 (en) |
JP (1) | JP3599823B2 (en) |
DE (2) | DE4410492A1 (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO1997019578A1 (en) * | 1995-11-21 | 1997-05-29 | Philips Electronics N.V. | Circuit arrangement |
WO2010027392A1 (en) * | 2008-09-05 | 2010-03-11 | Lutron Electronics Co., Inc. | Electronic ballast having asymmetric resonant circuit topology |
Families Citing this family (38)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5767631A (en) * | 1996-12-20 | 1998-06-16 | Motorola Inc. | Power supply and electronic ballast with low-cost inverter bootstrap power source |
DE19715341C1 (en) * | 1997-04-12 | 1998-10-15 | Vossloh Schwabe Gmbh | Electronic ballast with automatic restart |
US5939837A (en) * | 1997-07-15 | 1999-08-17 | Magnetek, Inc. | Electronic ballast circuit for independently increasing the power factor and decreasing the crest factor |
US5949199A (en) * | 1997-07-23 | 1999-09-07 | Virginia Tech Intellectual Properties | Gas discharge lamp inverter with a wide input voltage range |
US6034485A (en) * | 1997-11-05 | 2000-03-07 | Parra; Jorge M. | Low-voltage non-thermionic ballast-free energy-efficient light-producing gas discharge system and method |
US5998941A (en) * | 1997-08-21 | 1999-12-07 | Parra; Jorge M. | Low-voltage high-efficiency fluorescent signage, particularly exit sign |
US5917717A (en) * | 1997-07-31 | 1999-06-29 | U.S. Philips Corporation | Ballast dimmer with passive power feedback control |
US5982159A (en) * | 1997-07-31 | 1999-11-09 | Philips Electronics North America Corporation | Dimmable, single stage fluorescent lamp |
US6300722B1 (en) | 1997-11-05 | 2001-10-09 | Jorge M. Parra | Non-thermionic ballast-free energy-efficient light-producing gas discharge system and method |
WO1999052329A1 (en) * | 1998-04-02 | 1999-10-14 | Koninklijke Philips Electronics N.V. | Circuit arrangement |
JP2002500820A (en) * | 1998-04-02 | 2002-01-08 | コーニンクレッカ フィリップス エレクトロニクス エヌ ヴィ | Circuit layout |
DE19817508A1 (en) * | 1998-04-20 | 1999-11-04 | Vossloh Schwabe Gmbh | Starter for gas discharge fluorescence lamp with preheatable electrodes for determining fault condition of starter |
US6014326A (en) * | 1998-10-27 | 2000-01-11 | Hewlett-Packard Company | Half-bridge balancing circuit |
US6144169A (en) * | 1998-12-29 | 2000-11-07 | Philips Electronics North America Corporation | Triac dimmable electronic ballast with single stage feedback power factor inverter |
US6051936A (en) * | 1998-12-30 | 2000-04-18 | Philips Electronics North America Corporation | Electronic lamp ballast with power feedback through line inductor |
DE19905487A1 (en) * | 1999-02-11 | 2000-08-31 | Patent Treuhand Ges Fuer Elektrische Gluehlampen Mbh | Circuit arrangement for operating at least one low-pressure discharge lamp |
EP1095542B1 (en) * | 1999-05-06 | 2003-07-30 | Koninklijke Philips Electronics N.V. | Circuit arrangement |
US6411041B1 (en) | 1999-06-02 | 2002-06-25 | Jorge M. Parra | Non-thermionic fluorescent lamps and lighting systems |
US6465971B1 (en) | 1999-06-02 | 2002-10-15 | Jorge M. Parra | Plastic “trofer” and fluorescent lighting system |
KR100335990B1 (en) * | 1999-08-27 | 2002-05-10 | 윤덕용 | Power factor correction circuit of electronic ballast for fluorescent lamp |
EP1149512A1 (en) * | 1999-09-30 | 2001-10-31 | Koninklijke Philips Electronics N.V. | Circuit device to adapt high power gas discharge lamps |
WO2001024590A1 (en) * | 1999-09-30 | 2001-04-05 | Koninklijke Philips Electronics N.V. | Circuit arrangement to operate high voltage discharge lamps |
JP2003522396A (en) * | 2000-02-10 | 2003-07-22 | コーニンクレッカ フィリップス エレクトロニクス エヌ ヴィ | Protection circuit with NTC resistor |
KR100697726B1 (en) * | 2000-02-10 | 2007-03-21 | 페어차일드코리아반도체 주식회사 | A lamp system equipped with an electric ballast |
US6348767B1 (en) * | 2000-10-25 | 2002-02-19 | General Electric Company | Electronic ballast with continued conduction of line current |
AU2003223843B2 (en) * | 2002-03-21 | 2007-11-01 | Osram Ag | Circuit used for power factor correction |
US6936973B2 (en) * | 2002-05-31 | 2005-08-30 | Jorge M. Parra, Sr. | Self-oscillating constant-current gas discharge device lamp driver and method |
US20040217838A1 (en) * | 2003-04-29 | 2004-11-04 | Lestician Guy J. | Coil device |
US7348735B2 (en) | 2003-05-01 | 2008-03-25 | Inventive Holdings Llc | Lamp driver |
JP4552118B2 (en) * | 2003-07-11 | 2010-09-29 | 東芝ライテック株式会社 | Discharge lamp lighting device and bulb-type fluorescent lamp |
US6936970B2 (en) | 2003-09-30 | 2005-08-30 | General Electric Company | Method and apparatus for a unidirectional switching, current limited cutoff circuit for an electronic ballast |
NO322474B1 (en) * | 2003-10-21 | 2006-10-09 | Fontenoy Philippe | Fluorescent luminaire and method for operating fluorescents in such luminaires |
JP4771073B2 (en) * | 2005-03-24 | 2011-09-14 | 東芝ライテック株式会社 | Discharge lamp lighting device and lighting device |
DE102005025682B4 (en) * | 2005-06-03 | 2010-04-22 | Minebea Co., Ltd., Kitasaku | Device for controlling fluorescent lamps in a lighting arrangement |
US8736189B2 (en) * | 2006-12-23 | 2014-05-27 | Fulham Company Limited | Electronic ballasts with high-frequency-current blocking component or positive current feedback |
EP2104402A1 (en) * | 2008-03-17 | 2009-09-23 | Chuan Shih Industrial Co., Ldt. | Electronic ballast for fluorescent lamps |
US8525503B2 (en) | 2010-05-07 | 2013-09-03 | Xandex, Inc. | Hybrid rectifier |
CN102958261B (en) * | 2011-06-20 | 2015-08-05 | 李顺华 | A kind of LC inductive-capacitive ballast of high-pressure sodium lamp |
Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB2115627A (en) * | 1982-02-20 | 1983-09-07 | Transtar Limited | Power supplies |
EP0372303A1 (en) * | 1988-12-07 | 1990-06-13 | Patent-Treuhand-Gesellschaft für elektrische Glühlampen mbH | Circuit arrangement for operating a low-pressure discharge lamp |
WO1991002400A1 (en) * | 1989-08-04 | 1991-02-21 | Courier De Mere Henri Edouard | Feeding device for converters, free of harmonic distortion |
WO1992004808A1 (en) * | 1990-08-31 | 1992-03-19 | Siew Ean Wong | Improvements in electronic ballasts |
US5113337A (en) * | 1991-02-08 | 1992-05-12 | General Electric Company | High power factor power supply |
Family Cites Families (11)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3753037A (en) * | 1970-02-26 | 1973-08-14 | New Nippon Electric Co | Discharge-lamp operating device using thyristor oscillating circuit |
DE2941822A1 (en) * | 1979-10-16 | 1981-04-30 | Patra Patent Treuhand | Ballast arrangement for operating low-pressure discharge lamps |
DE3441992A1 (en) * | 1984-11-16 | 1986-05-22 | Patent-Treuhand-Gesellschaft für elektrische Glühlampen mbH, 8000 München | CIRCUIT ARRANGEMENT FOR IGNITING A LOW-PRESSURE DISCHARGE LAMP |
DE3608615A1 (en) * | 1986-03-14 | 1987-09-17 | Patent Treuhand Ges Fuer Elektrische Gluehlampen Mbh | CIRCUIT ARRANGEMENT FOR OPERATING LOW-PRESSURE DISCHARGE LAMPS |
DE3623749A1 (en) * | 1986-07-14 | 1988-01-21 | Patent Treuhand Ges Fuer Elektrische Gluehlampen Mbh | CIRCUIT ARRANGEMENT FOR OPERATING LOW-PRESSURE DISCHARGE LAMPS |
DE3805510A1 (en) * | 1988-02-22 | 1989-08-31 | Patent Treuhand Ges Fuer Elektrische Gluehlampen Mbh | CIRCUIT ARRANGEMENT FOR OPERATING A LOW-PRESSURE DISCHARGE LAMP |
US4996462A (en) * | 1988-07-27 | 1991-02-26 | Siemens Aktiengesellschaft | Electronic ballast for fluoroscent lamps |
DE3829388A1 (en) * | 1988-08-30 | 1990-03-01 | Patent Treuhand Ges Fuer Elektrische Gluehlampen Mbh | CIRCUIT ARRANGEMENT FOR OPERATING A LOAD |
ES2077609T3 (en) * | 1990-07-03 | 1995-12-01 | Siemens Ag | CIRCUIT ARRANGEMENT FOR A FREELY SWINGING LOCKING CONVERTER POWER SUPPLY. |
US5396153A (en) * | 1993-12-09 | 1995-03-07 | Motorola Lighting, Inc. | Protection circuit for electronic ballasts which use charge pump power factor correction |
US5412287A (en) * | 1993-12-09 | 1995-05-02 | Motorola Lighting, Inc. | Circuit for powering a gas discharge lamp |
-
1994
- 1994-03-25 DE DE4410492A patent/DE4410492A1/en not_active Withdrawn
-
1995
- 1995-02-15 US US08/389,179 patent/US5521467A/en not_active Expired - Fee Related
- 1995-03-13 EP EP95103597A patent/EP0679046B1/en not_active Expired - Lifetime
- 1995-03-13 DE DE59506071T patent/DE59506071D1/en not_active Expired - Lifetime
- 1995-03-22 JP JP08883095A patent/JP3599823B2/en not_active Expired - Fee Related
Patent Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB2115627A (en) * | 1982-02-20 | 1983-09-07 | Transtar Limited | Power supplies |
EP0372303A1 (en) * | 1988-12-07 | 1990-06-13 | Patent-Treuhand-Gesellschaft für elektrische Glühlampen mbH | Circuit arrangement for operating a low-pressure discharge lamp |
WO1991002400A1 (en) * | 1989-08-04 | 1991-02-21 | Courier De Mere Henri Edouard | Feeding device for converters, free of harmonic distortion |
WO1992004808A1 (en) * | 1990-08-31 | 1992-03-19 | Siew Ean Wong | Improvements in electronic ballasts |
US5113337A (en) * | 1991-02-08 | 1992-05-12 | General Electric Company | High power factor power supply |
Cited By (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO1997019578A1 (en) * | 1995-11-21 | 1997-05-29 | Philips Electronics N.V. | Circuit arrangement |
US5757143A (en) * | 1995-11-21 | 1998-05-26 | U.S. Philips Corporation | Discharge lamp control circuit with feedback loop to lower harmonic distortion |
CN1107439C (en) * | 1995-11-21 | 2003-04-30 | 皇家菲利浦电子有限公司 | Circuit arrangement |
WO2010027392A1 (en) * | 2008-09-05 | 2010-03-11 | Lutron Electronics Co., Inc. | Electronic ballast having asymmetric resonant circuit topology |
US8067902B2 (en) | 2008-09-05 | 2011-11-29 | Lutron Electronics Co., Inc. | Electronic ballast having a symmetric topology |
Also Published As
Publication number | Publication date |
---|---|
DE4410492A1 (en) | 1995-09-28 |
DE59506071D1 (en) | 1999-07-08 |
JP3599823B2 (en) | 2004-12-08 |
JPH07272885A (en) | 1995-10-20 |
US5521467A (en) | 1996-05-28 |
EP0679046B1 (en) | 1999-06-02 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
EP0679046B1 (en) | Circuit for operating low-pressure discharge lamps | |
EP0239793B1 (en) | Circuit arrangement for operating low-pressure discharge lamps | |
EP0798952B1 (en) | Circuit arrangement for operating electric lamps and method of operation | |
DE69530143T2 (en) | Protection circuit for arc discharge lamps | |
DE69224433T2 (en) | CONTROL CIRCUIT FOR A DISCHARGE LAMP | |
EP0062275B1 (en) | Ballast circuit for the operation of low-pressure discharge lamps | |
DE69719076T2 (en) | ELECTRONIC BALLAST WITH "VALLEY-FILL" PERFORMANCE FACTOR CORRECTION | |
EP0330118A2 (en) | Drive circuitry for a low-pressure discharge lamp | |
EP0372303B1 (en) | Circuit arrangement for operating a low-pressure discharge lamp | |
CH657003A5 (en) | CONTROL UNIT FOR OPERATING AT LEAST ONE LOW PRESSURE DISCHARGE LAMP. | |
WO1993012631A1 (en) | Circuit for operating one or more low-pressure discharge lamps | |
EP0800335A2 (en) | Circuit for operating electric lamps | |
EP0062276B1 (en) | Ballast circuit for the operation of low-pressure discharge lamps | |
EP0655880B1 (en) | Low voltage circuit for operating a low pressure discharge lamp | |
DE69202783T2 (en) | Ignition and operating circuit for arc discharge lamp. | |
EP0753987B1 (en) | Circuit and method of operation for electric lamps | |
EP1033066A1 (en) | Circuit configuration for operating at least one discharge lamp | |
EP0699016A2 (en) | Circuit for operating low pressure discharge lamps | |
EP0541909B1 (en) | Discharge lamp driving circuit | |
EP0691800A2 (en) | Circuit for operating low pressure discharge lamps | |
EP1028606B1 (en) | Circuit for operating at least one low-pressure discharge lamp | |
EP0697803B1 (en) | Circuit for operating discharge lamps | |
EP0276460B1 (en) | Circuit arrangement for operating a low-pressure discharge lamp | |
EP0648068B1 (en) | Circuit for operating electrical lamps | |
DE69714163T2 (en) | CIRCUIT |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
PUAI | Public reference made under article 153(3) epc to a published international application that has entered the european phase |
Free format text: ORIGINAL CODE: 0009012 |
|
AK | Designated contracting states |
Kind code of ref document: A1 Designated state(s): BE DE FR GB IT NL |
|
17P | Request for examination filed |
Effective date: 19951117 |
|
GRAG | Despatch of communication of intention to grant |
Free format text: ORIGINAL CODE: EPIDOS AGRA |
|
17Q | First examination report despatched |
Effective date: 19980720 |
|
GRAG | Despatch of communication of intention to grant |
Free format text: ORIGINAL CODE: EPIDOS AGRA |
|
GRAH | Despatch of communication of intention to grant a patent |
Free format text: ORIGINAL CODE: EPIDOS IGRA |
|
GRAH | Despatch of communication of intention to grant a patent |
Free format text: ORIGINAL CODE: EPIDOS IGRA |
|
GRAA | (expected) grant |
Free format text: ORIGINAL CODE: 0009210 |
|
AK | Designated contracting states |
Kind code of ref document: B1 Designated state(s): BE DE FR GB IT NL |
|
REF | Corresponds to: |
Ref document number: 59506071 Country of ref document: DE Date of ref document: 19990708 |
|
GBT | Gb: translation of ep patent filed (gb section 77(6)(a)/1977) |
Effective date: 19990721 |
|
ET | Fr: translation filed | ||
ITF | It: translation for a ep patent filed | ||
PLBE | No opposition filed within time limit |
Free format text: ORIGINAL CODE: 0009261 |
|
STAA | Information on the status of an ep patent application or granted ep patent |
Free format text: STATUS: NO OPPOSITION FILED WITHIN TIME LIMIT |
|
26N | No opposition filed | ||
REG | Reference to a national code |
Ref country code: GB Ref legal event code: IF02 |
|
PGFP | Annual fee paid to national office [announced via postgrant information from national office to epo] |
Ref country code: NL Payment date: 20060308 Year of fee payment: 12 Ref country code: GB Payment date: 20060308 Year of fee payment: 12 |
|
PGFP | Annual fee paid to national office [announced via postgrant information from national office to epo] |
Ref country code: BE Payment date: 20060314 Year of fee payment: 12 |
|
PGFP | Annual fee paid to national office [announced via postgrant information from national office to epo] |
Ref country code: FR Payment date: 20060324 Year of fee payment: 12 |
|
PGFP | Annual fee paid to national office [announced via postgrant information from national office to epo] |
Ref country code: IT Payment date: 20060331 Year of fee payment: 12 |
|
GBPC | Gb: european patent ceased through non-payment of renewal fee |
Effective date: 20070313 |
|
NLV4 | Nl: lapsed or anulled due to non-payment of the annual fee |
Effective date: 20071001 |
|
BERE | Be: lapsed |
Owner name: *PATENT-TREUHAND-G.- FUR ELEKTRISCHE GLUHLAMPEN M. Effective date: 20070331 |
|
PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: BE Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES Effective date: 20070331 |
|
REG | Reference to a national code |
Ref country code: FR Ref legal event code: ST Effective date: 20071130 |
|
PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: NL Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES Effective date: 20071001 |
|
PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: GB Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES Effective date: 20070313 |
|
PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: FR Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES Effective date: 20070402 |
|
PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: IT Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES Effective date: 20070313 |
|
PGFP | Annual fee paid to national office [announced via postgrant information from national office to epo] |
Ref country code: DE Payment date: 20100521 Year of fee payment: 16 |
|
PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: DE Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES Effective date: 20111001 |
|
REG | Reference to a national code |
Ref country code: DE Ref legal event code: R119 Ref document number: 59506071 Country of ref document: DE Effective date: 20111001 |