EP0201973B1 - Dispositif de circuit pour la mise en service de lampes à décharge de gaz ayant un courant de lampe changeant périodiquement - Google Patents

Dispositif de circuit pour la mise en service de lampes à décharge de gaz ayant un courant de lampe changeant périodiquement Download PDF

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Publication number
EP0201973B1
EP0201973B1 EP86200792A EP86200792A EP0201973B1 EP 0201973 B1 EP0201973 B1 EP 0201973B1 EP 86200792 A EP86200792 A EP 86200792A EP 86200792 A EP86200792 A EP 86200792A EP 0201973 B1 EP0201973 B1 EP 0201973B1
Authority
EP
European Patent Office
Prior art keywords
circuit arrangement
signal
resistor
voltage
semiconductor switch
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.)
Expired - Lifetime
Application number
EP86200792A
Other languages
German (de)
English (en)
Other versions
EP0201973A1 (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 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 Patentverwaltung GmbH, Philips Gloeilampenfabrieken NV, Koninklijke Philips Electronics NV filed Critical Philips Patentverwaltung GmbH
Publication of EP0201973A1 publication Critical patent/EP0201973A1/fr
Application granted granted Critical
Publication of EP0201973B1 publication Critical patent/EP0201973B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime 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
    • 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
    • H05B41/36—Controlling
    • H05B41/38—Controlling the intensity of light
    • H05B41/39—Controlling the intensity of light continuously
    • H05B41/392—Controlling the intensity of light continuously using semiconductor devices, e.g. thyristor

Definitions

  • the invention relates to a circuit arrangement for operating at least one gas discharge lamp with a periodically changing lamp current, which is suitable for connection to an AC voltage source with a period N and with a controlled semiconductor switch and with a control device for switching the controlled semiconductor switch with a switching period S depending on the Difference between an actual value signal proportional to the lamp current and a setpoint signal is provided.
  • Switching period S is understood here to mean the period of time during which the semiconductor switch is once in its conductive and the subsequent blocked state.
  • Periodically alternating current is understood to mean both pulsating direct current and alternating current and combinations of the two, an assigned frequency being in the frequency range from 1 kHz to 500 kHz, preferably between 20 and 150 kHz.
  • Gas discharge lamps and circuit arrangements for operating such lamps are usually fed with an AC voltage source, the AC voltage of which has a relatively low frequency.
  • the frequency is usually 50 Hz to 60 Hz, but frequencies up to 500 Hz are used.
  • a circuit arrangement of the type mentioned is known from DE-PS 26 42 272.
  • the controlled semiconductor switch is part of a flow converter and the control device contains a comparator with hysteresis for comparing the actual value signal with the desired value signal such that the controlled semiconductor switch is switched to conductive or non-conductive at a predetermined value of the difference between the two.
  • the setpoint signal has a somewhat smoothed rectified sinusoidal shape with a repetition frequency that is twice the frequency of the AC voltage source.
  • the setpoint signal is obtained in that a voltage is derived from the AC voltage source via a transformer and this voltage is then rectified with a rectifier.
  • a transformer is required for the galvanic separation of the setpoint signal from the AC voltage source, after which this setpoint signal can be brought to a potential desired for the control device.
  • Another option for obtaining a setpoint signal that is galvanically isolated from the AC voltage source is to use an optoelectronic coupling element.
  • the disadvantage of these options for obtaining galvanic isolation is that additional components are required in the circuit arrangement which cause the circuit arrangement to be more complicated and more expensive.
  • the invention is therefore based on the object of providing a relatively simple circuit arrangement with the omission of galvanic separating elements and while maintaining an advantageous form of the current to be taken from the AC voltage source.
  • the controlled semiconductor switch is bridged by a series circuit comprising a first and a second resistor and a capacitor is connected in parallel to the first resistor and a connection point between the first and the second resistor is used to derive the setpoint signal.
  • each time constant of the charge and discharge of the capacitor in combination with the first and the second resistor is greater than the switching period S and less than the period N.
  • each of the time constants preferably becomes smaller than chosen.
  • the requirement of a largely sinusoidal current draw from the AC voltage source can be met even better if, according to a development according to the invention, the setpoint signal also contains a DC voltage signal. In particular in the vicinity of the zero current crossing, a better approximation of the sinusoidal shape is achieved.
  • the circuit arrangement according to the invention preferably contains a coil with a tap with which a rectifier is connected in series; these. Combination of coil and rectifier is used to form the DC voltage signal.
  • the advantage of this circuit arrangement is that a desired DC voltage signal is formed in a very simple manner.
  • a and B are input terminals for connection to an AC voltage source of e.g. Designated 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 of which is connected to a charging capacitor 2 in parallel.
  • a flow converter consisting of a controlled semiconductor switch 3, a choke coil 4 and a freewheeling diode 6 is connected to the output of the full-wave rectifier 1.
  • a gas discharge lamp 5 to be operated is connected between the coil 4 and the freewheeling diode 6.
  • the controlled semiconductor switch 3 is designed as a transistor.
  • the charging capacitor 2 serves to facilitate the re-ignition of the lamp 5.
  • a measuring resistor 7 serving as a current sensor is also inserted, which is used to form an actual value signal proportional to the lamp current, which is emitted to an input C of a control device 8.
  • the lamp current is tracked by the control device 8 in the manner described below to a setpoint signal to be applied to the input D of the control device 8.
  • a setpoint signal fed to the input D of the control device 8 is derived from a voltage across the controlled semiconductor switch 3.
  • the controlled semiconductor switch 3 is made conductive or non-conductive by a signal arising at the output E of the control device 8.
  • the controlled semiconductor switch 3 lying in series with the measuring resistor 7 is bridged by a voltage divider consisting of a series circuit comprising a first resistor 10 and a second resistor 11, the first resistor 10 of which is connected to a capacitor 12 in parallel.
  • the setpoint signal which is proportional to the voltage across the controlled semiconductor switch 3, is derived as follows: A signal at the connection point 13 between the first and the second resistor 10 or 11 of the voltage divider is transmitted via a diode 14 and a further one consisting of the divider resistors 15 and 16 Voltage divider fed. The setpoint signal formed in this way is sent to the setpoint input D of the control device 8.
  • the value C 12 of the capacitor 12 is selected in combination with the values R i o and R 11 of the first and the second resistor 10 and 11, respectively, so that each time constant RioCi 2 and R 11 C 12 belongs to the charging and discharging of the capacitor 12 in combination with the first and second resistors 10 and 11 is greater than the switching period S and less than half the period the AC voltage source. In this way it is achieved that changes in the setpoint voltage due to the high transistor switching frequency are sifted, while at the same time slower changes can take effect. It has been found that with a setpoint signal generated in this way, an approximately sinusoidal current consumption of the circuit arrangement takes place from the AC voltage source. If the capacitor 12 is chosen too large, significant deviations from the sinusoidal shape can occur, while if the capacitor 12 is too small, vibrations can occur during operation of the forward converter.
  • a DC voltage signal can be superimposed on the setpoint signal which is proportional to the voltage across the controlled semiconductor switch 3.
  • This DC voltage signal can be positive or negative and change over times that are large compared to a period of the AC voltage source.
  • the level of the DC voltage signal can be set by appropriately dimensioning the resistors 15, 16 and 19.
  • the diodes 14 and 18 are used to decouple the DC voltage signal from the voltage of the voltage divider 10 and 11 respectively.
  • the DC voltage signal superimposed on the setpoint signal can be taken from a tap 20 of the choke coil 4 of the forward converter.
  • FIG. 2 shows an embodiment of the control device 8 according to FIG. 1.
  • This consists essentially of a hysteresis-related comparator 25 to which an amplifier 26 is connected.
  • the comparator 25 compares the setpoint and actual value signals present at inputs C and D. If the actual value signal reaches the setpoint signal plus the comparator hysteresis, the controlled semiconductor switch 3 is switched non-conductive by means of the amplifier 26. As a result, the lamp current and thus also the actual value signal decrease. If the actual value signal reaches the setpoint signal minus the comparator hysteresis, the comparator 25 switches the switching transistor 3 again through the amplifier 26, as a result of which the lamp current rises again. In this way, the lamp current always runs within the hysteresis limits around the setpoint.
  • the voltage divider connected in parallel with the controlled semiconductor switch can consist of more than two resistors.
  • the setpoint signal need not necessarily be tapped at a tap of the voltage divider connected to a capacitor.
  • the first resistor of the voltage divider need not be connected to the measuring resistor either, but can be placed on other points of the circuit arrangement.
  • circuit arrangement according to the invention is not only limited to use as a forward converter, but also e.g. can be designed as a flyback converter, bridge or half-bridge circuit or resonance converter.
  • the semiconductor switch is a switching transistor.
  • the invention is not limited to switching transistors, but is e.g. also applicable to thyristors, triacs and GTOs.

Landscapes

  • Circuit Arrangements For Discharge Lamps (AREA)

Claims (5)

1. Dispositif de circuit pour le fonctionnement d'au moins une lampe à décharge dans le gaz avec un courant de lampe alternant périodiquement pouvant être connecté à une source de tension alternative à durée de période N et muni d'un commutateur semiconducteur commandé ainsi qu'un dispositif de commande pour la commutation du commutateur semiconducteur commandé à durée de période de commutation S en fonction de la différence entre un signal de valeur réelle proportionnel au courant de lampe et un signal de valeur nominale, caractérisé en ce que lors du fonctionnement de la lampe 5, le signal de valeur nominale est dérivé au moins d'une tension qui est prélevée parallèlement au commutateur semiconducteur commandé.
2. Dispositif de circuit selon la revendication 1, caractérisé en ce que le commutateur semiconducteur commandé est shunté par un montage en série d'une première et d'une deuxième résistance et un condensateur est monté en parallèle avec la première résistance et un point de connexion entre la première et la deuxième résistance sert à la dérivation du signal de valeur nominale.
3. Dispositif de circuit selon la revendication 2, caractérisé en ce que chaque constante de temps de la charge et de la décharge du condensateur en connexion avec la première et la deuxième résistance est supérieure à la durée de période de commutation S et inférieure à la durée de période N.
4. Dispositif de circuit selon la revendication 1, 2 ou 3, caractérisé en ce que le signal de valeur nominale contient également un signal de tension continue.
5. Dispositif de commutation selon la revendication 4, caractérisé en ce qu'une bobine présentant une prise est en outre présente et un redresseur est monté en série avec cette dernière et cette combinaison de bobine et de redresseur sert à la formation du signal de tension continue.
EP86200792A 1985-05-13 1986-05-05 Dispositif de circuit pour la mise en service de lampes à décharge de gaz ayant un courant de lampe changeant périodiquement Expired - Lifetime EP0201973B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3517248 1985-05-13
DE19853517248 DE3517248A1 (de) 1985-05-13 1985-05-13 Schaltungsanordnung zum betrieb von gasentladungslampen mit hoeherfrequentem strom

Publications (2)

Publication Number Publication Date
EP0201973A1 EP0201973A1 (fr) 1986-11-20
EP0201973B1 true EP0201973B1 (fr) 1990-03-07

Family

ID=6270636

Family Applications (1)

Application Number Title Priority Date Filing Date
EP86200792A Expired - Lifetime EP0201973B1 (fr) 1985-05-13 1986-05-05 Dispositif de circuit pour la mise en service de lampes à décharge de gaz ayant un courant de lampe changeant périodiquement

Country Status (4)

Country Link
US (1) US4888524A (fr)
EP (1) EP0201973B1 (fr)
JP (1) JPS61260598A (fr)
DE (2) DE3517248A1 (fr)

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5710488A (en) * 1986-12-22 1998-01-20 Nilssen; Ole K. Low-frequency high-efficacy electronic ballast
US5237244A (en) * 1988-12-20 1993-08-17 Bertenshaw David R Electric lighting and power controllers therefor
US5079686A (en) * 1990-06-08 1992-01-07 Vlt Corporation Enhancement-mode zero-current switching converter
EP0507393A3 (fr) * 1991-04-04 1992-11-19 Koninklijke Philips Electronics N.V. Agencement de circuit
TW235383B (fr) * 1991-04-04 1994-12-01 Philips Nv
DE69517506T2 (de) * 1994-10-19 2001-02-08 Koninklijke Philips Electronics N.V., Eindhoven Schaltung für eine lampe bestehend aus 2 armen die mit der lampe verbunden sind
CA3019815A1 (fr) * 2017-10-11 2019-04-11 Yourtruckshop Inc. Circuit de phare avant de camion

Family Cites Families (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3265930A (en) * 1962-05-03 1966-08-09 Gen Electric Current level switching apparatus for operating electric discharge lamps
US3801867A (en) * 1972-11-01 1974-04-02 Gen Electric Direct current energization of gaseous discharge
US3913002A (en) * 1974-01-02 1975-10-14 Gen Electric Power circuits for obtaining a high power factor electronically
US4042856A (en) * 1975-10-28 1977-08-16 General Electric Company Chopper ballast for gaseous discharge lamps with auxiliary capacitor energy storage
US4045709A (en) * 1976-06-02 1977-08-30 General Electric Company Discharge lamp operating circuit
US4051411A (en) * 1976-09-02 1977-09-27 General Electric Company Discharge lamp operating circuit
DE2900910A1 (de) * 1979-01-11 1980-07-24 Siemens Ag Vorschaltgeraet fuer den betrieb von gasentladungslampen
DE3245924A1 (de) * 1982-12-11 1984-06-14 Philips Patentverwaltung Gmbh, 2000 Hamburg Schaltungsanordnung zum betrieb von hochdruck-gasentladungslampen
DE3327030A1 (de) * 1983-07-27 1985-02-07 Philips Patentverwaltung Gmbh, 2000 Hamburg Schaltungsanordnung zum betrieb von hochdruckgasentladungslampen

Also Published As

Publication number Publication date
EP0201973A1 (fr) 1986-11-20
US4888524A (en) 1989-12-19
JPS61260598A (ja) 1986-11-18
DE3517248A1 (de) 1986-11-13
DE3669429D1 (de) 1990-04-12

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