EP2138014A1 - Circuiterie pour l'allumage et l'utilisation d'une lampe à décharge - Google Patents

Circuiterie pour l'allumage et l'utilisation d'une lampe à décharge

Info

Publication number
EP2138014A1
EP2138014A1 EP07728439A EP07728439A EP2138014A1 EP 2138014 A1 EP2138014 A1 EP 2138014A1 EP 07728439 A EP07728439 A EP 07728439A EP 07728439 A EP07728439 A EP 07728439A EP 2138014 A1 EP2138014 A1 EP 2138014A1
Authority
EP
European Patent Office
Prior art keywords
ignition
voltage
transformer
lamp
capacitor
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.)
Withdrawn
Application number
EP07728439A
Other languages
German (de)
English (en)
Inventor
Joachim MÜHLSCHLEGEL
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Osram GmbH
Original Assignee
Osram GmbH
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Osram GmbH filed Critical Osram GmbH
Publication of EP2138014A1 publication Critical patent/EP2138014A1/fr
Withdrawn legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B41/00—Circuit arrangements or apparatus for igniting or operating discharge lamps
    • H05B41/02—Details
    • H05B41/04—Starting switches
    • H05B41/042—Starting switches using semiconductor devices
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B41/00—Circuit arrangements or apparatus for igniting or operating discharge lamps
    • H05B41/14—Circuit arrangements
    • H05B41/26—Circuit arrangements in which the lamp is fed by power derived from dc by means of a converter, e.g. by high-voltage dc
    • H05B41/28—Circuit arrangements in which the lamp is fed by power derived from dc by means of a converter, e.g. by high-voltage dc using static converters
    • H05B41/288—Circuit arrangements in which the lamp is fed by power derived from dc by means of a converter, e.g. by high-voltage dc using static converters with semiconductor devices and specially adapted for lamps without preheating electrodes, e.g. for high-intensity discharge lamps, high-pressure mercury or sodium lamps or low-pressure sodium lamps
    • H05B41/2881—Load circuits; Control thereof

Definitions

  • the invention relates to circuit arrangements and electronic operating devices for the ignition and operation of discharge lamps.
  • Electronic control gear for gas discharge lamps has been on the rise for years, offering significant advantages over conventional ballasts, such as higher light quality, better light output and automatic shutdown of the gas discharge lamps at the end of their life.
  • circuits with a so-called full bridge have been used for high-pressure gas discharge lamps, which operate the lamp with a kind of alternating direct current. This is necessary because most high pressure gas discharge lamps can not operate with higher frequency AC currents due to resonances in the burner vessel.
  • a pulse igniter is used, for which another switch is needed to trigger the ignition pulse. Since this type of inverter is very complicated and expensive, it has recently gone over to operate the lamps with a symmetrical half-bridge.
  • a pulse ignitor To ignite the lamp with such a circuit can also be used a pulse ignitor.
  • a half-bridge circuit with such a pulse ignition device is disclosed.
  • the circuit of the ignitor is not specified in this document, they but usually consists of at least one switch, a firing capacitor and an ignition transformer. This additional switch and the corresponding control of the same cause not to be underestimated costs.
  • US Pat. No. 7,170,235 B2 proposes combining an inverter in half or full bridge circuit with a resonance ignition of the gas discharge lamp. The resonance is in this case generated with its own high frequency controlled switch, which also causes high costs with the associated drive circuit.
  • the object of the present invention is therefore to provide a circuit arrangement with a half-bridge, which has a resonance ignition without the use of a high-frequency-controlled switch or without a controlled switch.
  • the circuit arrangement according to the invention consists of a half-bridge whose center 24 is connected to a lamp inductor Ll, which forms a series resonant circuit 17 together with a resonant capacitor 19.
  • This series resonant circuit 17 is connected via the primary winding L2 of a Zundtransformators 18 an excessive voltage for the ignition and the acquisition of the gas discharge lamp 5 ready.
  • This high-frequency resonance voltage is also applied to the primary winding L2 of the ignition transformer 18 and causes a current through the primary winding L2, which is derived via two series-connected diodes Dl and D2, and is transformed into a high voltage in the secondary winding L3.
  • a low-cost, slow-acting switch can be used, which is switched on during the ignition phase and remains switched off after the ignition of the gas discharge lamp.
  • the resonance voltage of the series resonant circuit is superimposed on a high ignition voltage, which can ignite the gas discharge lamp 5 safely.
  • FIG. 1 Circuit diagram of the circuit arrangement according to the invention according to the first embodiment.
  • FIG. 2 Circuit diagram of the circuit arrangement according to the invention with a DC voltage suppression capacitor C2 according to the second embodiment.
  • FIG. 3 Representation of relevant signals during resonance excitation according to the first embodiment.
  • FIG. 4 Effect of the DC suppression capacitor C2 of the second embodiment in rated operation.
  • FIG. 5 Representation of relevant signals at resonance excitation according to the second embodiment.
  • the circuit arrangement of the first embodiment consists of a symmetrical half-bridge, which contains two serially arranged switches Sl and S2 with the associated coupling capacitors C3 and C4.
  • the open ends of the series circuits are connected, on the one hand, to the voltage supply 3 and, on the other hand, to the circuit ground 1.
  • the intermediate circuit voltage U z Between the connection points 24 of the two switches and 26 of the two capacitors, a series circuit of a lamp inductor Ll, the secondary winding L3 of a Zundtransformators 18 and the gas discharge lamp 5 is connected.
  • a resonance capacitor 19 is connected, which is composed of at least one of the capacitances Cl and / or CIl and / or C5.
  • the resonant capacitor 19 together with the lamp inductor Ll the series resonant circuit 17.
  • the primary winding is also connected to one side to the connection point 22.
  • the other side is connected to the connection point of two series-connected diodes, which in turn are connected at the ends to the power supply 3 and to the circuit ground 1.
  • the cathodes of the diodes each point in the direction of the power supply 3.
  • the resonant circuit from the resonance capacitor 19 enters into resonance with Ll, and a peak voltage arises which clearly exceeds the positive and the negative DC link - voltage oscillates.
  • the peak value of the resonance voltage can be 300V - 1500V higher than the DC link voltage. Since the primary winding with one side is also connected to the resonance capacitor 19, during the resonance excitation, a high superimposition voltage is formed on the secondary side of the ignition transformer, which is added to the resonance voltage and this resulting voltage then forms the gas discharge lamp connected to the circuit arrangement can ignite.
  • the ignition voltage can reach a maximum amplitude of 1000V - 3000V.
  • Waveform 30 represents the voltage at half-bridge center 24 versus circuit ground 1. It can clearly be seen to toggle between about 0 and 400V.
  • the signal curve 34 represents the voltage at the resonance capacitor 19.
  • the waveform 36 shows the voltage across the lamp, which is composed of the voltage 34 at the resonant capacitor 19 and a superimposed over the Zund transformer part. A voltage with an amplitude of approx. 2000V is generated.
  • the resonance voltage applied across the resonant capacitor 19 is applied to the diode center 20 via the primary winding L2 of the ignition transformer 18.
  • the resonance voltage is substantially higher than the intermediate circuit voltage U z , alternately the first diode D 1 or the second diode D 2 becomes conductive, depending on whether the positive or the negative half-wave of the resonance voltage is present.
  • the voltage at point 20 is clamped to the voltage at voltage supply point 3 or to ground 1.
  • This creates a waveform that is very similar to a square wave. In resonance mode, therefore, a considerable current flows through the primary winding L2 of the ignition transformer 18, from which the ignition transformer 18 generates the aforementioned superposition voltage.
  • the bridge will be operated with a low frequency square wave voltage in the range of approximately 60Hz - 500Hz.
  • a high-frequency control is superimposed on this low-frequency operation, so that the switch closed at low-frequency is clocked in terms of high-frequency.
  • the frequency of the control is selected so that the bridge switches switch quasi-resonant, so that only small switching losses occur. Quasi-resonant in this context means that the inductor current is at the boundary between lagging and non-lagging operation.
  • the high-frequency square-wave voltage of the bridge is smoothed by the resonant circuit 17, which acts as an LC filter in this frequency range, and is supplied to the lamp as a square-wave voltage with a high-frequency voltage ripple.
  • the winding ratio of the ignition transformer and the voltage ripple on the resonant capacitor 19 are selected so that in normal operation (high-burned lamp) through the primary winding L2 of the ignition transformer 18 no or only a very small current flows, since the diodes Dl and D2 are predominantly in locking state. Due to the negligible current through the primary winding L2 affects almost the entire Leerlaufinduk- activity of the secondary winding L3 as a filter inductance. The inductance of the secondary winding L3 when the primary winding L2 is open can be regarded as an open-circuit inductance. By Umschwingvortician during commutation short current pulses may arise, which are derived via the diodes Dl and / or D2.
  • the current pulses can be detected on the one hand by voltage pulses at point 22 or other on the one hand by coupled voltage pulses to the primary winding via the ignition transformer 18 arise.
  • the coupled voltage pulses occur due to the lamp commutation, and are transmitted from the secondary side of the ignition transformer to the primary side.
  • the two diodes Dl and D2 thus act as switching elements that generate during the ignition phase an AC flow through the primary winding L2 and thus a high ignition voltage, and are open during normal operation and prevent current flow through the primary winding, so that the ignition transformer in this phase acts as a choke with high inductance.
  • the second embodiment is very similar to the first embodiment. Therefore, only the differences from the first embodiment will be set forth.
  • a DC block can be connected between the primary winding L2 and the diode center 20. Capacitor C2 are switched, which prevents the current flow in the primary winding during normal operation.
  • the DC block capacitor C2 can also be arranged at a suitable other point of the path from point 22 to point 1 or to point 3.
  • the DC block capacitor gives you more freedom in dimensioning for the winding ratio and the voltage ripple on Cl. This can be understood with reference to FIG. 4.
  • Signal 31 shows the intermediate circuit voltage, which is applied at point 3.
  • Signal 35 shows the voltage at the center of the diode against the ground point 1. The voltage is within the intermediate circuit voltage, since at higher voltages the diodes would become conductive and thus clamp the voltage to the intermediate circuit voltage as in resonance mode.
  • Signal 37 shows the voltage at the primary winding L2 against the ground point 1. Since only direct current can flow via the diodes D1 and D2, C2 prevents the current flow in the event that the voltage ripple at the diode end 20 of the primary winding L2 in normal operation temporarily above the intermediate circuit voltage. In this case, C2 is charged after the commutation of the low-frequency lamp current to a voltage corresponding to the difference between the peak value at the primary winding and the intermediate circuit voltage.
  • Signal 33 represents the current through the primary winding L2. It is not difficult to see that almost no current flows through the primary winding L2, even though the voltage ripple on the capacitor 19 is higher than the intermediate circuit voltage. Due to the fact that no current flow through the primary winding takes place, in normal operation the ignition transformer can fully act as a smoothing choke, and the gas discharge Protect lamp 5 from the high voltage ripple on capacitor 19.
  • FIG. 5 shows the current in the primary winding L2 (signal 43) and the voltage across the lamp during the Zundvor- gang.
  • a high-frequency alternating current alternately flows through Dl and D2, so that C2 is constantly reloaded.
  • the signal 53 represents this current.
  • This high-frequency alternating current in the primary winding in this case flows through C2.
  • Signal 52 represents the voltage across resonant capacitor 19, and signal 54 represents the firing voltage across the lamp.
  • the third embodiment is similar to the second embodiment. Therefore, only the differences from the second embodiment will be described.
  • the second diode D2 is replaced by a controlled switch which, together with the DC negative-pressure capacitor (C2), allows current to flow through the primary winding L2 of the ignition transformer 18 during ignition.
  • the switch is closed during the Zund Anlagens, whereas it is open during normal operation of the gas discharge lamp. Thus flows during normal operation of the gas discharge lamp 5 no appreciable current.
  • opening the switch after the ignition takes over the diode Dl the still flowing through the primary winding L2 of Zundtransfor- mators 18 stream.
  • the fourth embodiment is similar to the third embodiment. Therefore, only the differences from the second embodiment will be described.
  • the fourth embodiment is further simplified compared to the third embodiment.
  • the first diode Dl is saved in this embodiment, so that when opening the switch, the interruption of the current flow through the primary winding L2 of the ignition transformer 18 causes an excessive voltage across the primary winding L2 of the ignition transformer 18.
  • the switch must be designed for this increased load or have a corresponding circuit for suppressing the excessive voltage.

Abstract

L'invention concerne une circuiterie pour l'allumage et l'utilisation d'une lampe à décharge gazeuse, comportant un dispositif de demi-pont fonctionnant en tant qu'onduleur abaisseur, une bobine de choc de lampe (L1) et un condensateur de résonance (19), formant un circuit oscillant (17), et un transformateur d'allumage (18) dont l'enroulement secondaire (L3) est connecté d'une part à une électrode de lampe et d'autre part au point de connexion (22) entre la bobine de choc de lampe (L1) et le condensateur de résonance (19). L'enroulement primaire (L2) du transformateur d'allumage est d'une part connecté au point de connexion (22) entre la bobine de choc de lampe (L1) et le condensateur de résonance (19), et d'autre part au point de connexion (20) de deux diodes (D1, D2) montées en série, les diodes étant par ailleurs connectées à l'alimentation en tension (3) et à la masse du circuit (1).
EP07728439A 2007-04-24 2007-04-24 Circuiterie pour l'allumage et l'utilisation d'une lampe à décharge Withdrawn EP2138014A1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/EP2007/053983 WO2008128577A1 (fr) 2007-04-24 2007-04-24 Circuiterie pour l'allumage et l'utilisation d'une lampe à décharge

Publications (1)

Publication Number Publication Date
EP2138014A1 true EP2138014A1 (fr) 2009-12-30

Family

ID=38729042

Family Applications (1)

Application Number Title Priority Date Filing Date
EP07728439A Withdrawn EP2138014A1 (fr) 2007-04-24 2007-04-24 Circuiterie pour l'allumage et l'utilisation d'une lampe à décharge

Country Status (5)

Country Link
US (1) US20100060180A1 (fr)
EP (1) EP2138014A1 (fr)
CN (1) CN101658072B (fr)
TW (1) TW200917901A (fr)
WO (1) WO2008128577A1 (fr)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102009009892A1 (de) * 2009-02-20 2010-09-16 Osram Gesellschaft mit beschränkter Haftung Elektronisches Betriebsgerät für eine Gasentladungslampe
US8564984B2 (en) * 2010-12-10 2013-10-22 Futurewei Technologies, Inc. Soft switching DC/DC converters and methods
US9237636B1 (en) * 2014-05-12 2016-01-12 Universal Lighting Technologies, Inc. Self-clamped resonant filament heating circuit

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3887441T2 (de) * 1987-10-27 1994-05-11 Matsushita Electric Works Ltd Entladungslampenbetriebsschaltung.
FR2707051B1 (fr) * 1993-06-10 1996-03-08 Matsushita Electric Works Ltd
CA2206200C (fr) * 1997-04-18 2000-06-27 Matsushita Electric Works, Ltd. Appareil d'eclairage par lampe a decharge
US7170235B2 (en) * 2003-01-14 2007-01-30 Koninklijke Philips Electronics N.V. Circuit arrangement with a separate resonant igniter for a high-pressure discharge lamp
JP4348984B2 (ja) * 2003-04-01 2009-10-21 パナソニック電工株式会社 高圧放電灯点灯装置
DE102004017479A1 (de) * 2004-04-08 2005-10-27 Patent-Treuhand-Gesellschaft für elektrische Glühlampen mbH EVG mit Resonanzanregung zur Übernahmespannungserzeugung
DE202005005791U1 (de) * 2005-04-11 2005-07-21 Nucon GbR: Gert G. Niggemeyer & Jörg Niggemeyer (vertretungsberechtigter Gesellschafter: Herr Jörg Niggemeyer, 21244 Buchholz) Schaltung zum Betreiben von Miniatur Kurzbogenlampen mit Wechselstrom
US7432664B2 (en) * 2006-09-29 2008-10-07 Osram Sylvania Inc. Circuit for powering a high intensity discharge lamp

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO2008128577A1 *

Also Published As

Publication number Publication date
CN101658072A (zh) 2010-02-24
CN101658072B (zh) 2013-06-12
WO2008128577A1 (fr) 2008-10-30
TW200917901A (en) 2009-04-16
US20100060180A1 (en) 2010-03-11

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