EP0224301A2 - Circuit pour le fonctionnement en courant alternatif de lampes à décharge - Google Patents

Circuit pour le fonctionnement en courant alternatif de lampes à décharge Download PDF

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Publication number
EP0224301A2
EP0224301A2 EP86202018A EP86202018A EP0224301A2 EP 0224301 A2 EP0224301 A2 EP 0224301A2 EP 86202018 A EP86202018 A EP 86202018A EP 86202018 A EP86202018 A EP 86202018A EP 0224301 A2 EP0224301 A2 EP 0224301A2
Authority
EP
European Patent Office
Prior art keywords
voltage
circuit arrangement
voltage source
switching element
power supply
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Withdrawn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
EP86202018A
Other languages
German (de)
English (en)
Other versions
EP0224301A3 (fr
Inventor
Hans Günther Ganser
Ralf Dr. Schäfer
Hans-Peter Dr. Stormberg
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.)
Philips Intellectual Property and Standards GmbH
Koninklijke Philips NV
Original Assignee
Philips Corporate Intellectual Property GmbH
Philips Patentverwaltung GmbH
Philips Gloeilampenfabrieken NV
Koninklijke Philips Electronics NV
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 Philips Corporate Intellectual Property GmbH, Philips Patentverwaltung GmbH, Philips Gloeilampenfabrieken NV, Koninklijke Philips Electronics NV filed Critical Philips Corporate Intellectual Property GmbH
Publication of EP0224301A2 publication Critical patent/EP0224301A2/fr
Publication of EP0224301A3 publication Critical patent/EP0224301A3/fr
Withdrawn legal-status Critical Current

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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
    • H05B41/2921—Arrangements for protecting lamps or circuits against abnormal operating conditions for protecting the circuit against abnormal operating conditions
    • H05B41/2926—Arrangements for protecting lamps or circuits against abnormal operating conditions for protecting the circuit against abnormal operating conditions against internal abnormal circuit conditions
    • 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 AC operation of a gas discharge lamp, provided with a full-wave rectifier connected to an AC voltage source, to the output of which a switching power supply is connected as a DC converter, to which a bridge circuit with at least two thyristors is connected, in the transverse branch of which the lamp is received.
  • a thyristor is understood to mean an electrical component which is switched on by a signal to its control electrode, but which only switches off after the current has dropped below its holding current value. This applies e.g. also for so-called triacs too.
  • the current reduction is e.g. B. reached at the zero crossing of the applied voltage.
  • Such a circuit arrangement is known from DE-OS 31 36 919.
  • a switching power supply unit operating as a forward converter generates a pulsating DC voltage, possibly superimposed with high frequency.
  • This pulsating DC voltage is converted by a thyristor bridge controlled by the AC voltage source into an AC voltage that changes with the frequency of the voltage source, which in turn can be superimposed on a certain high-frequency modulation.
  • the forward converter is fed by the alternating voltage of the source, which is rectified by means of a full-wave rectifier, without a smoothing capacitor being connected downstream of the rectifier.
  • the invention is therefore based on the object of providing a circuit arrangement for AC operation of gas discharge lamps with a thyristor bridge circuit in which the rectified AC voltage is smoothed, but short circuits in the thyristor bridge circuit are nevertheless avoided under operating circumstances.
  • the vicinity of the AC voltage zero crossings is understood to mean a time period of no more than 10% of the source frequency period before and after the zero crossover.
  • the electronic switching element is switched on only shortly after the zero crossings of the AC voltage source. It has also proven to be advantageous if the electronic switch of the switched-mode power supply is not turned on shortly after the zero crossing of the AC voltage source. Briefly means a time gap between 0.1% and 10% of the source frequency period.
  • a monostable multivibrator controlled by the AC voltage source is provided for controlling the switching power supply and the electronic switching element, the output pulses of which control the electronic switching element and the electronic switch of the switching power supply in time with the zero crossings of the AC voltage source.
  • a further full-wave rectifier can be connected to the AC voltage source, the DC voltage of which is fed to an input of the monostable multivibrator via a voltage divider.
  • a Zener diode is connected in parallel to the input of the monostable multivibrator.
  • a and B are input terminals for connection to an AC voltage source of, for example, 220 V, 50 Hz.
  • a full-wave rectifier 1 with four diodes is connected to these input terminals A and B, possibly via a high-frequency filter (not shown), the output 1a, 1b of which is connected to a smoothing capacitor 2 in parallel.
  • a switched-mode power supply is connected to the output 1a, 1b of the full-wave rectifier 1 as a DC converter.
  • the converter is designed as a forward converter and consists of an electronic switching element 3, for example a main switching transistor, a choke coil 4 and a freewheeling diode 6.
  • a bridge circuit 9 is connected to the DC voltage converter, in the transverse branches of which a gas discharge lamp 5 is received.
  • the smoothing capacitor 2 serves to facilitate the re-ignition of the lamp 5.
  • a measuring resistor 7 serving as a current sensor, at which an actual value voltage proportional to the instantaneous lamp current actual value is tapped, which is applied to an input C of a control device 8 becomes.
  • the lamp current is tracked by the control device 8 in a manner known per se to a setpoint signal to be applied to an input D of the control device 8.
  • the current drawn from the AC voltage source run as sinusoidally as possible.
  • the signal generated at an output E of the control device 8 causes the electronic switching element 3 to be switched on or off.
  • a terminal F of the switching device 8 is connected to ground. Via a terminal G, the control device 8 is supplied with a supply voltage taken from the inductor 4.
  • the gas discharge lamp 5 is located in the transverse branch of a bridge circuit 9 connected in parallel with the freewheeling diode 6 and the inductor 4 with four thyristors 10 to 13, which can be controlled by the AC voltage source.
  • the ignition electrodes of the thyristors 10 to 13 would have to be connected in a manner known per se (DE-OS 31 36 919) to the respective thyristor cathodes via a parallel circuit comprising a resistor, a capacitor and an oppositely polarized diode.
  • the ignition electrodes of two thyristors 10, 13 and 11, 12, which are located diagonally opposite each other in the bridge circuit 9, should each be connected via a resistor to one of the input terminals A or B of the AC voltage source. (For the sake of clarity, the control of the thyristors is not shown in the drawing).
  • an electronic switching element 14 for example a transistor, is connected in parallel, which is switched to be conductive in the vicinity of the zero crossings of the AC voltage source.
  • the electronic switching element 14 is in series with a current limiting resistor 15 and is controlled by a monostable multivibrator 16, which is used to detect the zero crossings of the AC voltage.
  • a further full-wave rectifier 17 is connected to the AC voltage source, whose DC voltage is supplied to an input HK of the monostable multivibrator 16 via a voltage divider consisting of two resistors 18 and 19.
  • the multivibrator input voltage taken from the voltage divider resistor 19 is smoothed somewhat by a capacitor 20 in order to suppress HF interference, and the peak voltage is limited by means of a Zender diode 21 connected in parallel with this capacitor.
  • the voltage U HK present across the Zener diode 21 and thus at the input HK of the monostable multivibrator 16 has the curve shape shown schematically in FIG. 2.
  • the pulse sequence (U L ) which is also shown only schematically in FIG. 2b, then arises at an output L of the multivibrator 16.
  • the monostable multivibrator 16 can be used to set whether the start of the individual pulses is on the falling or rising edge of the signal shown in FIG. 2a, among others; the pulse duration can also be specified via the multivibrator 16.
  • a stabilized DC supply voltage of, for example, is used to supply the monostable multivibrator 16 at point M and also other circuit components. +10 V, which is generated in the usual way with the aid of a resistor 22, a storage capacitor 23 and a Zener diode 24.
  • the output signal of the monostable multivibrator 16 (FIG. 2b) is applied to the base of a transistor 27 via a voltage divider 25, 26. Its collector is connected to the DC supply voltage and its emitter is connected to the base of the electronic switching element 14 by a further voltage divider 28, 29. The collector / emitter path of this electronic switching element 14 is parallel to the thyristor bridge 9. This circuit causes that when the multivibrator 16 has a positive output signal, the electronic switching element 14 conducts and thus short-circuits the thyristor bridge 9 or bridges it with the current limiting resistor 15.
  • the electronic switch 3 connected in series in the switching power supply should be switched non-conductive during the conductive state of the electronic switching element 14.
  • the emitter of transistor 27 is connected via a current limiting resistor 30 to the input of an optocoupler 31, the output signal of which is fed to control device 8.
  • the control device 8 is acted upon by a pulse train which occurs simultaneously with the output pulse train of the multivibrator 16 and is used to switch the electronic switch 3 of the flow converter non-conductive via the control device 8 during the same time during which the electronic switching element 14 is conductive.
  • an output pulse sequence (U L Medical) which is phase-shifted with respect to the zero crossing of the network can be generated (FIG. 2c), which leads to later deletion of the thyristors in the conductive branch of the bridge circuit.
  • This phase-shifted output should preferably be used Insert the pulse sequence shortly after the zero crossings of the AC voltage.
  • the pulse may only be shifted to the extent that the other bridge branch has not yet been ignited at the time of deletion, since otherwise short circuits may occur.
  • Typical values for the pulse duration are, for example, about 0.1 to 0.5 msec and 0.1 to 1 msec for the phase shift, which is between 0.1% and 10% of the source frequency period.
  • the switched-mode power supply not only needs to be a forward converter, but can also be designed as a flyback converter, resonance converter or the like.
  • the choke coil of the forward converter can be in series with the gas discharge lamp in the transverse branch of the bridge circuit.

Landscapes

  • Circuit Arrangements For Discharge Lamps (AREA)
EP86202018A 1985-11-19 1986-11-17 Circuit pour le fonctionnement en courant alternatif de lampes à décharge Withdrawn EP0224301A3 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19853540985 DE3540985A1 (de) 1985-11-19 1985-11-19 Schaltungsanordnung zum wechselstrombetrieb von gasentladungslampen
DE3540985 1985-11-19

Publications (2)

Publication Number Publication Date
EP0224301A2 true EP0224301A2 (fr) 1987-06-03
EP0224301A3 EP0224301A3 (fr) 1987-10-14

Family

ID=6286364

Family Applications (1)

Application Number Title Priority Date Filing Date
EP86202018A Withdrawn EP0224301A3 (fr) 1985-11-19 1986-11-17 Circuit pour le fonctionnement en courant alternatif de lampes à décharge

Country Status (4)

Country Link
US (1) US4748381A (fr)
EP (1) EP0224301A3 (fr)
JP (1) JPS62131498A (fr)
DE (1) DE3540985A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0556134A2 (fr) * 1992-02-14 1993-08-18 Cableco Dispositif - variateur de l'intensité du courant électrique dans un récepteur

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DD293020A5 (de) * 1990-03-16 1991-08-14 Komb. Veb Narva "Rosa Luxemburg",De Verfahren und vorrichtung zum impulsbetrieb von hochdruckentladungslampen
US5045760A (en) * 1990-05-29 1991-09-03 Williams Sign Supplies Ltd. Neon sign transformer
DE4039186A1 (de) * 1990-12-05 1992-06-11 Narva Gluehlampen Schaltungsanordnung zum impulsbetrieb von hochdruckentladungslampen
BE1007682A3 (nl) * 1993-10-29 1995-09-12 Philips Electronics Nv Schakelinrichting.
US5610477A (en) * 1994-04-26 1997-03-11 Mra Technology Group Low breakdown voltage gas discharge device and methods of manufacture and operation

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4346332A (en) * 1980-08-14 1982-08-24 General Electric Company Frequency shift inverter for variable power control
EP0201624A2 (fr) * 1985-05-14 1986-11-20 TRILUX-LENZE GmbH & Co. KG Circuit ballast pour lampe fluorescente

Family Cites Families (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
NL166381C (nl) * 1971-05-08 1981-07-15 Philips Nv Werkwijze voor het bedrijven van een lagedrukkwikdamp- ontladingslamp, en inrichting voor het uitvoeren van deze werkwijze.
US3882356A (en) * 1973-12-20 1975-05-06 Texas Instruments Inc Level shifter transistor for a fluorescent lamp ballast system
US4042856A (en) * 1975-10-28 1977-08-16 General Electric Company Chopper ballast for gaseous discharge lamps with auxiliary capacitor energy storage
US4253046A (en) * 1978-12-11 1981-02-24 Datapower, Inc. Variable intensity control apparatus for operating a gas discharge lamp
DE3149526A1 (de) * 1981-12-14 1983-06-23 Philips Patentverwaltung Schaltungsanordnung zum betrieb von hochdruck-gasentladungslampen
DE3327030A1 (de) * 1983-07-27 1985-02-07 Philips Patentverwaltung Gmbh, 2000 Hamburg Schaltungsanordnung zum betrieb von hochdruckgasentladungslampen
DE3420229A1 (de) * 1984-05-30 1985-12-05 Frank 3013 Barsinghausen Hansmann Schaltungsanordnung zum betrieb von metalldampf-entladungslampen
US4614898A (en) * 1985-06-24 1986-09-30 General Electric Company Electronic ballast with low frequency AC to AC converter
US4613795A (en) * 1985-06-24 1986-09-23 General Electric Company Driver circuit controller for AC to AC converters
US4649321A (en) * 1985-10-28 1987-03-10 General Electric Company Gate capacitance latch for DC to AC converters

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4346332A (en) * 1980-08-14 1982-08-24 General Electric Company Frequency shift inverter for variable power control
EP0201624A2 (fr) * 1985-05-14 1986-11-20 TRILUX-LENZE GmbH & Co. KG Circuit ballast pour lampe fluorescente

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0556134A2 (fr) * 1992-02-14 1993-08-18 Cableco Dispositif - variateur de l'intensité du courant électrique dans un récepteur
FR2687514A1 (fr) * 1992-02-14 1993-08-20 Cableco Sa Dispositif-variateur de l'intensite du courant electrique dans un recepteur.
EP0556134A3 (fr) * 1992-02-14 1993-10-06 Cableco Dispositif - variateur de l'intensité du courant électrique dans un récepteur
US5404287A (en) * 1992-02-14 1995-04-04 Gaz De Bordeaux Device for regulating the intensity of the electric current in a receiver

Also Published As

Publication number Publication date
DE3540985A1 (de) 1987-05-21
EP0224301A3 (fr) 1987-10-14
US4748381A (en) 1988-05-31
JPS62131498A (ja) 1987-06-13

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