WO2006064408A1 - Circuit de lampe a decharge de gaz haute frequence - Google Patents

Circuit de lampe a decharge de gaz haute frequence Download PDF

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Publication number
WO2006064408A1
WO2006064408A1 PCT/IB2005/054084 IB2005054084W WO2006064408A1 WO 2006064408 A1 WO2006064408 A1 WO 2006064408A1 IB 2005054084 W IB2005054084 W IB 2005054084W WO 2006064408 A1 WO2006064408 A1 WO 2006064408A1
Authority
WO
WIPO (PCT)
Prior art keywords
lamp
circuit
voltage
impedance
source
Prior art date
Application number
PCT/IB2005/054084
Other languages
English (en)
Inventor
Thijs Oosterbaan
Rene Van Honschooten
Original Assignee
Koninklijke Philips Electronics N.V.
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 Koninklijke Philips Electronics N.V. filed Critical Koninklijke Philips Electronics N.V.
Priority to EP05822503A priority Critical patent/EP1829431A1/fr
Priority to JP2007546241A priority patent/JP2008523573A/ja
Publication of WO2006064408A1 publication Critical patent/WO2006064408A1/fr

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
    • H05B41/14—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
    • 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
    • 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
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
    • Y02B20/00—Energy efficient lighting technologies, e.g. halogen lamps or gas discharge lamps

Definitions

  • the invention relates to a lamp circuit as described in the pre-characterizing part of claim 1.
  • a gas discharge lamp circuit of this type is disclosed in US 4,959,593.
  • the alternating voltage (AC) supply source is the mains, so that the lamp- operating frequency has a low value of, for example, 50Hz or 60Hz.
  • the inductor and the capacitor, which are connected in series with the lamp, are both part of a ballast circuit. Consequently, the capacitor has a value which represents a significant impedance for the lamp-operating frequency.
  • An ignition circuit is connected parallel to the lamp.
  • the ignition circuit comprises a series arrangement of two networks of a resistor and a capacitor, a voltage-dependent device and possibly an inductor.
  • the voltage-dependent device may be a bilateral semiconductor switch, for example, a sidac.
  • the ignition circuit When the lamp circuit is turned on, the ignition circuit generates ringing (on/off) voltages.
  • the ringing voltages distort the supply by the AC supply source, and a high- voltage, high-frequency ignition pulse is generated across the lamp so as to ignite it.
  • HID lamps are usually supplied with a square-wave current at a low lamp-operating frequency of 50Hz to 500Hz.
  • the lamp is ignited by superimposing a high- voltage ignition pulse on the low-frequency voltage supplied to the lamp.
  • a pulse transformer is therefore connected in series with the lamp so as to induce such an ignition pulse to the low-frequency lamp supply voltage.
  • a transformer of this type represents a very high impedance which significantly affects normal lamp operation. Moreover, the resistance of such a transformer causes energy losses.
  • the object of the invention is achieved by providing a lamp circuit as defined in claim 1.
  • the capacitor acts as a DC blocking device. It breaks the DC current path between the lamp and the AC source. It thereby prevents a DC current flow through the AC source. In this way, a high DC voltage can be built up across the lamp. This high DC voltage results in ignition of the lamp.
  • the capacitor may have a comparatively low impedance for the (HF) AC frequency, in which case it would not be a significant component in the ballasting function. In another implementation, the capacitor may have a comparatively high impedance, representing a significant part of the ballasting impedance.
  • the lamp circuit When the lamp circuit is turned on, the lamp is not conducting and represents a very high impedance.
  • the DC voltage source will then charge said capacitor in a relatively short time of typically 10ms, thereby generating a high voltage across the lamp, so that the lamp may ignite. After its ignition, the lamp will represent a much lower impedance. As a result, a steady HF supply current may flow from the AC source through the lamp.
  • the resistor connected in series with the high- voltage DC source has a value which is sufficient to limit an AC current through the DC source. This AC current-limiting function can also be fulfilled by an inductor constituting a similar impedance for the AC frequency.
  • the DC voltage may have a much lower amplitude than an ignition pulse used in the prior art to ignite the lamp.
  • the lower amplitude may lead to the condition that the lamp circuit must meet more easily attainable requirements of a lower safety class.
  • the lower amplitude mitigates isolation requirements and allows a smaller size of the lamp circuit.
  • Fig. 1 shows a diagram of a first embodiment of a gas discharge lamp circuit according to the invention.
  • Fig. 2 shows a diagram of a second embodiment of a gas discharge lamp circuit according to the invention.
  • the gas discharge lamp circuit according to the invention shown in Fig. 1 comprises a high-frequency (HF) power supply source 2.
  • An inductor 4, a capacitor 6 and a gas discharge lamp 8 are connected in series with the HF supply source 2.
  • the HF supply source 2 may be, for example, a half bridge, a lull bridge, and a class-E DC- AC converter, comprising switches which are alternately switched on and off to provide a substantial AC voltage.
  • a series circuit of a resistor 10 and a direct-voltage (DC) source 12 is connected parallel to the lamp 8.
  • DC direct-voltage
  • HF voltage source 2 400 V, 2 MHz.
  • inductor 4 40 ⁇ H capacitor 6: 22OpF lamp 8: to infinite if not ignited; 60 ⁇ if ignited resistor 10: 50M ⁇
  • DC voltage source 12 15kV
  • the invention specifically relates to circuits having a comparatively high operating frequency.
  • Such circuits with high lamp- current frequencies, have significant advantages of cost and size when compared to low- frequency ballasts.
  • the properties of the lamp such as efficacy, may be positively influenced by the high frequency of operation. This is, for example, the case with fluorescent lamps.
  • the second embodiment of the gas discharge lamp circuit according to the invention comprises an inductor 14 instead of resistor 10.
  • Inductor 14 provides an impedance which is comparable to that of resistor 10 for the AC frequency.
  • the ignition circuit of the second embodiment shown in Fig. 2 also comprises a control circuit 16.
  • the control circuit enables the ignitor when the circuit is switched on. After the lamp 8 has ignited, the igniter can be disabled and no DC current will flow through the DC voltage source 12 and resistor 10. Consequently, during normal operation of the lamp 8, no DC power from DC voltage source 12 will be consumed.
  • Control circuit 16 may comprise a timer to disable the DC voltage source after, for example, several milliseconds, from the time a DC current starts flowing. This represents a simple and inexpensive embodiment, in particular in cases where lamp specifications and changes with time are known in advance. An example of such a case is the field of automotive lighting with Xenon lamps.
  • Control circuit 16 may also comprise a sensor or detector or a detecting circuit generally used to detect run-up or a steady state of operation of the lamp 8, often referred to as normal operation.
  • the detection circuit may comprise a light sensor for detecting light emitted by the lamp 8. It may also comprise an AC current detector for detecting an AC current flowing through the lamp. Moreover, it may comprise a DC current detector for detecting a DC current flowing through the lamp 8 and/or through resistor 10. Upon detecting such an AC and/or DC current, the control circuit 16 may control the DC voltage source to be rendered inoperative.
  • the ignition circuit according to the invention may also be used in a lamp circuit having an inductor 4 with a low value while maintaining the advantages as described above.

Landscapes

  • Circuit Arrangements For Discharge Lamps (AREA)

Abstract

Cette invention concerne un circuit de lampe comprenant un circuit en série d'une source d'alimentation en tension alternative (AC) conçue pour produire une tension alternative présentant une fréquence de fonctionnement de lampe élevée, un inducteur de ballast (4), un condensateur (6), des bornes de connexion à une lampe à décharge de gaz (8) et, connecté à ces bornes, un circuit d'allumage permettant d'allumer la lampe (8). Le condensateur (6) présente une valeur qui représente une faible impédance pour la fréquence de fonctionnement de la lampe. Le circuit d'allumage comprend un agencement en série d'une impédance (10, 14) et d'une source de tension directe (DC) (12) conçue pour produire une tension directe élevée. L'impédance en série (10, 14) du circuit d'allumage présente une valeur qui est élevée par rapport à une valeur d'impédance de la lampe (8) pendant le démarrage et pendant un fonctionnement en régime continu de la lampe (8).
PCT/IB2005/054084 2004-12-14 2005-12-06 Circuit de lampe a decharge de gaz haute frequence WO2006064408A1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
EP05822503A EP1829431A1 (fr) 2004-12-14 2005-12-06 Circuit de lampe a decharge de gaz haute frequence
JP2007546241A JP2008523573A (ja) 2004-12-14 2005-12-06 高周波ガス放電ランプ回路

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
EP04106567 2004-12-14
EP04106567.3 2004-12-14

Publications (1)

Publication Number Publication Date
WO2006064408A1 true WO2006064408A1 (fr) 2006-06-22

Family

ID=36061507

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/IB2005/054084 WO2006064408A1 (fr) 2004-12-14 2005-12-06 Circuit de lampe a decharge de gaz haute frequence

Country Status (4)

Country Link
EP (1) EP1829431A1 (fr)
JP (1) JP2008523573A (fr)
CN (1) CN101080953A (fr)
WO (1) WO2006064408A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102010028222A1 (de) 2010-04-27 2011-10-27 Osram Gesellschaft mit beschränkter Haftung Verfahren zum Betreiben einer Gasentladungslampe und Gasentladungslampensystem

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0411617A2 (fr) * 1989-08-01 1991-02-06 Toshiba Lighting & Technology Corporation Méthode et appareil pour amorcer une lampe à décharge
US5506479A (en) * 1991-08-23 1996-04-09 Robert Bosch Gmbh Device for operating a gas-discharge lamp

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0411617A2 (fr) * 1989-08-01 1991-02-06 Toshiba Lighting & Technology Corporation Méthode et appareil pour amorcer une lampe à décharge
US5506479A (en) * 1991-08-23 1996-04-09 Robert Bosch Gmbh Device for operating a gas-discharge lamp

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102010028222A1 (de) 2010-04-27 2011-10-27 Osram Gesellschaft mit beschränkter Haftung Verfahren zum Betreiben einer Gasentladungslampe und Gasentladungslampensystem
WO2011134800A2 (fr) 2010-04-27 2011-11-03 Osram Gesellschaft mit beschränkter Haftung Procédé permettant de faire fonctionner une lampe à décharge et système de lampe à décharge

Also Published As

Publication number Publication date
CN101080953A (zh) 2007-11-28
JP2008523573A (ja) 2008-07-03
EP1829431A1 (fr) 2007-09-05

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