WO2012004697A1 - Dispositif de commande de lampe - Google Patents

Dispositif de commande de lampe Download PDF

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Publication number
WO2012004697A1
WO2012004697A1 PCT/IB2011/052671 IB2011052671W WO2012004697A1 WO 2012004697 A1 WO2012004697 A1 WO 2012004697A1 IB 2011052671 W IB2011052671 W IB 2011052671W WO 2012004697 A1 WO2012004697 A1 WO 2012004697A1
Authority
WO
WIPO (PCT)
Prior art keywords
frequency
lamp
voltage
buffer capacitor
circuit part
Prior art date
Application number
PCT/IB2011/052671
Other languages
English (en)
Inventor
René VAN HONSCHOOTEN
Patrick Alouisius Martina De Bruycker
John Stephane Hirsch
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.
Publication of WO2012004697A1 publication Critical patent/WO2012004697A1/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
    • H05B41/292—Arrangements for protecting lamps or circuits against abnormal operating conditions
    • H05B41/2928—Arrangements for protecting lamps or circuits against abnormal operating conditions for protecting the lamp against abnormal operating conditions

Definitions

  • the invention relates to a lamp driver for operating an HID-lamp, comprising: input terminals for connection to the poles of a low frequency supply voltage, rectifying means coupled to the input terminals for rectifying the low frequency supply voltage,
  • buffer capacitor means coupled to the rectifying means for filtering the rectified low frequency supply voltage
  • a DC-AC-converter coupled to the buffer capacitor means for generating a high frequency AC lamp current with average frequency f out of the voltage across the buffer capacitor means, said DC-AC-converter comprising a circuit part I for generating a control signal with average frequency f .
  • Such a lamp driver is generally known.
  • operating the lamp at a comparatively high frequency can result in acoustic resonances.
  • these acoustic resonances are undesirable since they cause instabilities in the lamp.
  • An exception is the so-called arc straightening resonance that stabilizes the discharge. It is therefore generally desirable to choose a way of operating the lamp that makes sure that the arc straightening resonance is excited while excitation of the other acoustic resonances is suppressed.
  • the invention aims to achieve such lamp operation.
  • a lamp driver as described in the opening paragraph is therefore characterized in that the lamp driver is further equipped with a circuit part II, coupled between the output terminals of the rectifying means and the circuit part I, for modulating the frequency of the control signal with a frequency equal to twice the frequency of the low frequency supply voltage.
  • the buffer capacitor means can be directly connected to the output terminals of the rectifying means as is the case in the embodiment shown in Fig. 2.
  • the circuit part II is connected directly to the output terminals of the rectifying means.
  • one of the output terminals of the rectifying means is coupled to the buffer capacitor means via a diode.
  • the output terminals of the rectifying means can be connected by means of a (comparatively small) capacitor.
  • An embodiment is shown on the left side of Fig. 1.
  • the circuit part II is generally coupled directly to the output terminals of the rectifying means.
  • a power factor correction circuit is coupled between the rectifying means and the buffer capacitor means.
  • Such a power factor correction circuit can be for instance an up-converter.
  • An embodiment is shown on the right side of Fig. 1.
  • one of the output terminals of the rectifying means is coupled to the buffer capacitor means via a series arrangement of a choke and a diode.
  • the circuit part II can be directly connected to the output terminals of the rectifying means but can also for instance be connected to the cathode of the diode and one of the output terminals of the rectifying means.
  • the circuit part II is coupled to one of the output terminals of the rectifying means via the series arrangement of the choke and the diode.
  • frequency modulation is effected making use of the rectified supply voltage or of a derived voltage such as the ripple that is present across the buffer capacitor means. It has been found that a lamp driver according to the invention is of a very simple construction. The modulation ensures that the frequency spectrum is broadened, while the amplitudes of the frequencies are low enough to avoid excitation of acoustic resonances. At the same time it appeared possible to excite the arc straightening resonance in a dependable way.
  • the HID lamp impedance will increase when the momentary voltage across the buffer capacitor means is low, because the momentary lamp current is small. This is caused by thermal characteristics of the HID lamp. The increased lamp impedance can cause the extinguishing of the lamp. This undesired effect can, however, be avoided making use of the modulation.
  • the modulation of the frequency of the control signal is synchronized with the rectified supply voltage or with the AC component of the voltage present across the buffer capacitor means, in other words with the voltage ripple.
  • This synchronization should preferably be such that the frequency of the control signal (and thus the frequency of the lamp current) is low when the amplitude of the voltage across the buffer capacitor means is low and the frequency of the control signal is high when the amplitude of the voltage across the buffer capacitor means is high.
  • This synchronization makes the lamp impedance more constant and increases the life of the lamp.
  • the circuit part I can be realized in a simple and dependable way in case it comprises a current source (CS), a capacitor CI, a comparator COMP and a switching element S.
  • circuit part II comprises a capacitor C2 and a resistor Rl coupled between the buffer capacitor means and the capacitor CI.
  • FM repetition frequency lOOHz (Synchronized with the mains supply)
  • the average frequency is generated by an oscillation circuit .
  • This oscillating circuit comprises a current source CS, a capacitor CI, a comparator COMP and a switching element S.
  • This oscillating circuit together with circuit part CC forms circuit part I in the embodiment shown in Fig. 2
  • the FM algorithm which needs to be synchronized with the mains frequency, is derived from the ripple that is present on the buffer capacitor that supplies the resonant half -bridge. (C3 in figure 2)
  • An example of the implementation of the frequency determining circuit is shown in figure 2.
  • the current source CS is supplying a constant current to a common terminal of switch S and capacitor C 1.
  • a second current is supplied to this terminal via the voltage divider formed by resistors Rl and R2, and capacitor C2 and resistor R3, together forming a circuit part II.
  • control signals used to control the switching elements Ml and M2 in the resonant converter are derived by the circuitry comprised in circuit part CC from the voltage at the output of comparator COMP , the frequency of these control signals and the frequency of the lamp current are also frequency modulated with a frequency of 100Hz and also have an average value of f.
  • the amplitude of the FM modulation is determined by several circuit components and the lamp power:
  • Figure 3 displays the resulting FM-shape.
  • the momentary frequency will be varied around the average frequency of 52 kHz.
  • the HID lamp-impedance will increase when the momentary voltage across capacitor C3 is low and the lamp current is thus comparatively small. (This is caused by thermal characteristics of the HID lamp)
  • the increased lamp- impedance might be followed by lamp extinguishing. This is a real disadvantage when the HID-lamp is operated on a resonant topology that is only supplied by the rectified mains. This undesired effect can be avoided by the modulation algorithm. The following is done:
  • the FM algorithm is synchronized with the mains ripple (100Hz);
  • phase between the mains-ripple and the FM is defined as:
  • FM signal results in low half -bridge frequencies when the ripple voltage is low FM signal results in high half -bridge frequencies when the ripple voltage is high
  • FIG. 4 displays an example of the voltage across capacitor C3, consisting of a constant DC voltage with a voltage ripple superimposed upon it.
  • the control algorithm of the resonant lamp driver is designed in a way that it will immediately after ignition generate the correct frequency spectrum that is required to trigger the arc- straightening frequency of the HID-burner. This means that the proposed design will immediately generate the required spectrum after lamp breakdown.

Landscapes

  • Circuit Arrangements For Discharge Lamps (AREA)

Abstract

L'invention porte sur un dispositif de commande de lampe pour faire fonctionner une lampe à décharge de forte intensité, lequel dispositif comprend : des bornes d'entrée pour la connexion aux pôles d'une tension d'alimentation basse fréquence, des moyens de redressement couplés aux bornes d'entrée pour redresser la tension d'alimentation basse fréquence, des moyens formant condensateur tampon couplés aux bornes de sortie de moyens de redressement pour filtrer la tension d'alimentation basse fréquence redressée, un convertisseur courant continu/courant alternatif couplé au moyen formant condensateur tampon pour générer un courant de lampe alternatif haute fréquence avec une fréquence moyenne s à partir de la tension aux bornes des moyens formant condensateur tampon, ledit convertisseur courant continu/ courant alternatif comprenant une partie de circuit I pour générer un signal de commande avec une fréquence moyenne f. Selon l'invention, le dispositif de commande de lampe comporte de plus, une partie de circuit II, couplée entre les bornes de sortie de moyens de redressement et la partie de circuit II, pour moduler la fréquence du signal de commande avec une fréquence égale à deux fois la fréquence de la tension d'alimentation basse fréquence. Cette modulation de fréquence est réalisée d'une manière simple, et assure que la résonnance de redressement d'arc est excitée dans le plasma de la lampe.
PCT/IB2011/052671 2010-07-08 2011-06-20 Dispositif de commande de lampe WO2012004697A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
EP10168880.2 2010-07-08
EP10168880 2010-07-08

Publications (1)

Publication Number Publication Date
WO2012004697A1 true WO2012004697A1 (fr) 2012-01-12

Family

ID=44628358

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/IB2011/052671 WO2012004697A1 (fr) 2010-07-08 2011-06-20 Dispositif de commande de lampe

Country Status (2)

Country Link
CN (2) CN102316651A (fr)
WO (1) WO2012004697A1 (fr)

Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0059064B1 (fr) * 1981-02-21 1985-10-02 THORN EMI plc Circuit de démarrage et d'exploitation de lampes
DE4234358A1 (de) * 1992-10-12 1993-02-25 Juerg Nigg Verfahren zum betrieb einer gasentladungs- oder fluoreszenzlampe und vorschaltgeraet hierfuer sowie verwendungen hierfuer
US5404082A (en) * 1993-04-23 1995-04-04 North American Philips Corporation High frequency inverter with power-line-controlled frequency modulation
US6483252B2 (en) * 2000-12-08 2002-11-19 Koninklijke Philips Electronics N.V. Optimal FM for HF operation of high intensity discharge (HID) lamps
US20030117086A1 (en) * 2001-12-21 2003-06-26 Koninklijke Philips Electronics N.V. Use of arc straightening in HID lamps operated at VHF frequencies
US20030127993A1 (en) * 2002-01-10 2003-07-10 Erhardt Robert A. High frequency electronic ballast
US20090289570A1 (en) * 2004-12-14 2009-11-26 Koninklijke Philips Electronics, N.V. Method for supplying a gas discharge lamp, and a ballast circuit for such lamp
WO2009149763A1 (fr) * 2008-06-13 2009-12-17 Osram Gesellschaft mit beschränkter Haftung Montage et procédé pour faire fonctionner une source de lumière

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0059064B1 (fr) * 1981-02-21 1985-10-02 THORN EMI plc Circuit de démarrage et d'exploitation de lampes
DE4234358A1 (de) * 1992-10-12 1993-02-25 Juerg Nigg Verfahren zum betrieb einer gasentladungs- oder fluoreszenzlampe und vorschaltgeraet hierfuer sowie verwendungen hierfuer
US5404082A (en) * 1993-04-23 1995-04-04 North American Philips Corporation High frequency inverter with power-line-controlled frequency modulation
US6483252B2 (en) * 2000-12-08 2002-11-19 Koninklijke Philips Electronics N.V. Optimal FM for HF operation of high intensity discharge (HID) lamps
US20030117086A1 (en) * 2001-12-21 2003-06-26 Koninklijke Philips Electronics N.V. Use of arc straightening in HID lamps operated at VHF frequencies
US20030127993A1 (en) * 2002-01-10 2003-07-10 Erhardt Robert A. High frequency electronic ballast
US20090289570A1 (en) * 2004-12-14 2009-11-26 Koninklijke Philips Electronics, N.V. Method for supplying a gas discharge lamp, and a ballast circuit for such lamp
WO2009149763A1 (fr) * 2008-06-13 2009-12-17 Osram Gesellschaft mit beschränkter Haftung Montage et procédé pour faire fonctionner une source de lumière

Also Published As

Publication number Publication date
CN202276533U (zh) 2012-06-13
CN102316651A (zh) 2012-01-11

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