EP0063168B1 - Appareil avec lampe à décharge à haute pression - Google Patents

Appareil avec lampe à décharge à haute pression Download PDF

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Publication number
EP0063168B1
EP0063168B1 EP19810103046 EP81103046A EP0063168B1 EP 0063168 B1 EP0063168 B1 EP 0063168B1 EP 19810103046 EP19810103046 EP 19810103046 EP 81103046 A EP81103046 A EP 81103046A EP 0063168 B1 EP0063168 B1 EP 0063168B1
Authority
EP
European Patent Office
Prior art keywords
current
discharge tube
lamp
voltage
high pressure
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
Application number
EP19810103046
Other languages
German (de)
English (en)
Other versions
EP0063168A1 (fr
Inventor
Shigeru Horii
Nobuhisa Yoshikawa
Kazutaka Koyama
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.)
Panasonic Holdings Corp
Original Assignee
Matsushita Electric Industrial Co Ltd
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 Matsushita Electric Industrial Co Ltd filed Critical Matsushita Electric Industrial Co Ltd
Priority to DE8181103046T priority Critical patent/DE3175621D1/de
Priority to EP19810103046 priority patent/EP0063168B1/fr
Publication of EP0063168A1 publication Critical patent/EP0063168A1/fr
Application granted granted Critical
Publication of EP0063168B1 publication Critical patent/EP0063168B1/fr
Expired 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
    • H05B41/36—Controlling
    • H05B41/38—Controlling the intensity of light
    • 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

  • This invention relates to an improvement in an AC mains connection apparatus for a high pressure discharge lamp such as a high pressure mercury lamp, a high pressure sodium lamp, or a high pressure metal-halide lamp.
  • the present invention especially concerns an improvement in a high pressure discharge lamp apparatus of the type comprising a high pressure discharge tube, a current limiting device, for instance a choke coil, and a pulse generator output terminals of which are connected in parallel to the electrodes of the discharge tube for lighting the tube with a lamp voltage nearly equal to a power source voltage.
  • a voltage of the power source should be maintained over 1.5 times a voltage of the discharge tube for preventing an extinction of ignition in the tube. Therefore a voltage drop across the current limiting device is high, and a power loss at the current limiting device is rather large. Accordingly, a dimension and a weight of the current limiting device become undesirably large.
  • a pulse generator may be provided in a manner to give pulses to the discharge tube. By such impression of pulses across the discharge tube, the lamp voltage can be selected so high as nearly equal to the power source voltage.
  • the conventional discharge lamp apparatus having a pulse generator as abovementioned still have the following problems:
  • a duty time of the current limiting device 5 is controlled by firing angle controlling action of the semiconductor switching device 6 in such manner that at the starting the duty time of the switching device 6 is very small and at the steady lighting state the duty time is very large, so that effectively the auxiliary current limiting device 5 is substantially short-circuited by the switching device 6 at a steady lighting state of the lamp. Therefore a lamp current may be maintained for the same degree between at a steady lighting state and at a starting transient state.
  • US ⁇ A ⁇ 4101809 discloses an AC mains connection apparatus for a high pressure discharge lamp, which comprises a discharge tube, a current limiting device and a transistor switch being connected in series across a power supply.
  • the tube is DC operated and the source of DC voltage can be a rectified AC source which is mains- connected.
  • a pulse generator is connected in parallel to the discharge tube to supply DC pulses to the discharge tube until the lamp ignites.
  • the high pressure discharge lamp apparatus of the present invention comprises a discharge tube and a current limiting device connected in series, an over-current protecting device is further connected in series to said discharge tube, over- current protecting device being controlled of its firing angle responding to an output of a current detection circuit, and a pulse generator is further connected in parallel to the discharge tube.
  • FIG. 2 A fundamental apparatus embodying the present invention is shown in FIG. 2.
  • a current limiting device 2 and an over-current protecting device 11 are connected in series with a discharge tube 3 across a power source 1.
  • a pulse generator 4 is connected in parallel to the discharge tube 3 for supplying reignition pulses to the discharge tube 3.
  • a lamp current detecting circuit 9 for detecting a lamp current and giving control signal to the over- current protecting device 11 is connected in parallel to the discharge tube 3.
  • the pulse generator 4 is for preventing extinction of the tube and allowing a selection of a lamp voltage high enough close to a voltage of the power source 1, by supplying the reignition pulses to the discharge tube 3, during a period from near the zero-cross point of the voltage of power source 1 to a stated point for from the zero-cross point in every cycle of the voltage of power source 1.
  • the reignition pulses extinction of the ignition in the discharge tube 3 may be effectively avoided even in the zero current period in each cycle of the lamp current.
  • FIG. 3 shows an apparatus embodying the present invention which uses a semiconductor switching device 11 as the over-current protector and uses a lamp current detecting circuit 9, which in actual circuit is a voltage detection circuit which outputs a signal to indicate a voltage of the discharge tube 3 and has a specified relation with the lamp current, is shown in FIG. 3.
  • a current limiting device 2 of passive element device such as a choke coil
  • the semiconductor switching device 11 as the over-current protector and a discharge tube 3 are connected in series across a power source 1.
  • a pulse generator 4 for impressing reignition signal on the discharge tube 3 is connected in parallel to the latter.
  • the lamp current detecting circuit 9 is connected in parallel to the discharge tube 3.
  • a firing angle controlling circuit 10 is disposed so as to receiving an output signal of the lamp current detecting circuit 9 and supply a firing angle controlling signal to the switching device 11.
  • a firing angle of the switching device 11 is controlled based on a relation between the lamp current and the lamp voltage which is detected in the lamp current detecting circuit 9. And the switching device 11 controls the firing angle, hence effective value of the current of the discharge tube 3 from the power source 1, and thereby protects an over- current at the starting transient state.
  • the pulse generator 4 supplies reignition pulses in every cycle to the discharge tube 3 at least during the zero current period of the lamp current in order for avoiding an extinction of the discharge tube 3 due to zero current period both in starting transient state and steady lighting state.
  • a lamp voltage V La and a lamp current I La of the high pressure discharge tube show the curves as shown in FIG. 4.
  • Z La which is relatively small at incipient period of starting of lighting in the discharge tube wherein a vapour pressure in the tube is relatively small.
  • the impedance Z La increases as time lapses.
  • the lamp current I La that is a current through the choke coil, decreases at the time lapses, and simultaneously the lamp voltage V La increases as shown in FIG. 4.
  • the amount of the lamp current I La can be known by detecting the lamp voltage V La based on abovementioned relation between the current I La and the voltage V La' Consequently, the lamp current I La can be controlled by detecting the lamp voltage V La primarily.
  • FIG. 5 is a circuit diagram of the apparatus of the present invention.
  • FIG. 7A and FIG. 7B are wave-form chart of various parts of the circuit shown in FIG. 5.
  • a voltage across the discharge tube 3 is impressed to the lamp current detecting circuit 9 which detects a lamp current by detecting a lamp voltage. That is, in present invention, the lamp current is easily detected by a simple circuit as shown in FIG. 5.
  • the lamp current detecting circuit 9 the lamp voltage having a certain relation with the lamp current as shown in FIG.
  • FIG. 7A is given to the firing angle controlling circuit 10, wherein the power source voltage V S is led through a resistor R 4 , DB 1 and R 5 , and then is level clipped by a regulate diode D 1 , whose voltage wave-form V 1 is shown in FIG. 7A.
  • the voltage wave-form V 1 is supplied to an anode of PUT (programmable uni- junction transistor) Q 2 through a resistor R 6 .
  • the transistor Q 1 maintains off state as abovementioned, and hence the voltage of wave-form V 1 is supplied to a capacitor C 2 for charging only through the resistor R 6 .
  • a voltage wave-form V 2 of the capacitor C 2 is formed as shown in FIG. 7A.
  • the voltage of wave-form V 1 is divided by resistors R 8 and Rg, and the divided voltage is impressed to a gate of the PUT Q 2 .
  • the voltage V 2 of the capacitor C 2 grows up and comes above the voltage impressed to the gate of the PUT Q 2 , hence the PUT Q 2 turns on. Consequently the electric charge in the capacitor C 2 discharges through the PUT Q 2 .
  • a trigger pulse V 3 as shown in FIG. 7A is produced across both ends of a resistor R 10 .
  • AthyristorTh is triggered by the pulses V 3 impressed through a resistor R 11 .
  • the thyristor Th turns on, both out-put ends of the diode bridge circuit DB 1 are short-circuited by the thyristor Th, and hence the voltage V 1 becomes zero, and then triggering action of the PUT Q 2 is stopped.
  • the PUT Q 2 turns on at a firing angle corresponding to the time constant resistor R 6 and the capacitor C 2 , and therefore, the thyristor Th turns on by receiving the triggering pulses V 3 impressed to the gate thereof through the resistor R 11 .
  • the thyristor Th maintains "on" state until a forward current thereof becomes lower than a holding current of the thyristor Th at a timing near an end of every positive half cycle of the power source voltage V s .
  • a gate current flows in the triac TC as a switching device 11 through the path of:
  • a main load current I La of the triac TC is appropriately controlled by the firing angle controlling circuit 10 which determines a firing angle 8 1 of the triac TC as shown in FIG. 7A.
  • the main load current I La has a zero current period in each cycle, by means of the reignition pulses Vp are supplied to the discharge tube 3 at least during the zero current period in each cycle of the main load current l La .
  • the lamp voltage increases, and also the base potential of the transistor Q 1 rises, so that the transistor Q 1 turns on.
  • a series circuit of the resistor R 7 and the internal resistance (collector-emitter resistance) of the on-state transistor Q 1 is connected in parallel to the resistor R 6 , and therefore a charging time of the capacitor C 2 is shortened. Accordingly a time till the PUT Q 2 turns on is shortened, and therefore the time phase of trigger pulses V 3 across the resistor R 10 is led, hence the firing angle of the triac TC becomes very small as shown by 8 2 ( ⁇ 2 « ⁇ 1 ) in FIG. 7B.
  • an apparatus of present invention has a pulse generator 4 and a switching device as an over-current protecting device, and the lamp current atthe starting transient state is suppressed by over-current protecting device nearly equal to the lamp current at the steady lighting state, preventing the extinction by the reignition pulses from the pulse generator 4.
  • the current limiting device 2 can be designed small enough and further a loss therein can be satisfactorily diminished.
  • FIG. 6 is a detailed circuit diagram of the pulse generator 4, and FIG. 8 is a wave-form chart of various parts of the circuit shown in FIG. 6.
  • the pulse generator 4 issues ignition pulses to the discharge tube 3, and the discharge tube 3 is ignited. Operation of the pulse generator 4 after starting of ignition is elucidated hereafter separating in two parts. First part is for the positive half cycle period of the power source voltage V s and the second part is for the negative half cycle period of the power source voltage V s .
  • Performance curves of the high pressure discharge lamp apparatus of present invention at a starting trangent state are shown in FIG. 9.
  • characteristic of the lamp voltage is designated by the curve V La' the lamp current by I La , and firing angle at a condition that the starting lamp current is controlled during a period t c from starting of lighting of the discharge tube by 8.
  • the transformer T can be replaced by a suitable isolator for example, photo-isolator.
  • the pulse generator 4 of FIG. 6 can be constituted by a digital IC, thereby a similar function is obtainable.

Landscapes

  • Circuit Arrangements For Discharge Lamps (AREA)

Claims (4)

1. Appareil de connexion au secteur alternatif pour une lampe à décharge à haute pression, comprenant:
- un tube à décharge (3),
- un dispositif limiteur de courant (2) étant monté en série avec le tube à décharge (3) aux bornes d'une source d'alimentation (1),
- un générateur d'impulsions (4) connecté en parallèle avec le tube à décharge (3) pour fournir des impulsions au tube à décharge (3),
caractérisé en ce que:
- le tube à décharge (3) est actionné en courant alternatif,
- un dispositif de protection contre les surintensités (11) est prévu,
- ce dispositif de protection contre les surintensités (11) étant connecté en série avec le tube à décharge (3) et le dispositif limiteur de courant (2) aux bornes de la source d'alimentation (1) et en ce qu'un circuit (9) de détection de courant de lampe est fourni, ce circuit de détection de courant de lampe étant branché en parallèle avec le tube à décharge (3), détectant un courant dans la lampe par l'intermédiaire de la détection d'une tension aux bornes d'une paire d'électrodes du tube à décharge (3) et donnant un signal de commande appliqué au dispositif de protection contre les surintensités (11).
2. Appareil avec lampe à décharge à haute pression selon la revendication 1, caractérisé en ce que le dispositif de protection contre les surintensités (11) est un dispositif de commutation en semi-conducteur.
3. Appareil avec lampe à décharge à haute pression selon la revendication 2, caractérisé en ce qu'une période à courant nul dans chaque cycle du dispositif de commutation en semi-conducteur (11) est commandée par un circuit (10) de commande d'angle d'amorçage.
4. Appareil avec lampe à décharge selon la revendication 3, caractérisé en ce que le générateur d'impulsions (4) émet des impulsions pour provoquer un ré-allumage du tube à décharge (3) pendant au moins la période à courant nul dans chaque cycle du dispositif de commutation en semi-conducteur (11).
EP19810103046 1981-04-22 1981-04-22 Appareil avec lampe à décharge à haute pression Expired EP0063168B1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
DE8181103046T DE3175621D1 (en) 1981-04-22 1981-04-22 High pressure discharge lamp apparatus
EP19810103046 EP0063168B1 (fr) 1981-04-22 1981-04-22 Appareil avec lampe à décharge à haute pression

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP19810103046 EP0063168B1 (fr) 1981-04-22 1981-04-22 Appareil avec lampe à décharge à haute pression

Publications (2)

Publication Number Publication Date
EP0063168A1 EP0063168A1 (fr) 1982-10-27
EP0063168B1 true EP0063168B1 (fr) 1986-11-12

Family

ID=8187669

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19810103046 Expired EP0063168B1 (fr) 1981-04-22 1981-04-22 Appareil avec lampe à décharge à haute pression

Country Status (2)

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EP (1) EP0063168B1 (fr)
DE (1) DE3175621D1 (fr)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB8611660D0 (en) * 1986-05-13 1986-10-29 British Aerospace Pulse generating circuits
DE4118077A1 (de) * 1991-06-01 1992-12-03 Bosch Gmbh Robert Vorrichtung zum betreiben einer gasentladungslampe
GB0003580D0 (en) * 2000-02-16 2000-04-05 Ford David W Electrical power supply unit
CN103037602A (zh) * 2011-10-08 2013-04-10 张玉清 一种亮度可调电子镇流器

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1150758B (de) * 1961-02-02 1963-06-27 Siemens Ag Schaltungsanordnung zum Zuenden von Hochdruckgasentladungslampen hoher Leistung, insbesondere von Hochdruck-Langbogenlampen, sowie Beleuchtungsanlage mit dieser Schaltungsanordnung
US4048543A (en) * 1976-10-04 1977-09-13 General Electric Company Discharge lamp operating circuit
US4101809A (en) * 1977-05-26 1978-07-18 General Electric Company Discharge lamp operating circuit

Also Published As

Publication number Publication date
DE3175621D1 (en) 1987-01-02
EP0063168A1 (fr) 1982-10-27

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