EP0165701B1 - Lastspeisungsschaltung und Lampenmodul - Google Patents

Lastspeisungsschaltung und Lampenmodul Download PDF

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Publication number
EP0165701B1
EP0165701B1 EP19850303410 EP85303410A EP0165701B1 EP 0165701 B1 EP0165701 B1 EP 0165701B1 EP 19850303410 EP19850303410 EP 19850303410 EP 85303410 A EP85303410 A EP 85303410A EP 0165701 B1 EP0165701 B1 EP 0165701B1
Authority
EP
European Patent Office
Prior art keywords
load
circuit
supply
supply circuit
lamp
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
EP19850303410
Other languages
English (en)
French (fr)
Other versions
EP0165701A1 (de
Inventor
Karam Hussain Malik
Sydney Alfred Richard Rigden
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.)
Osram Ltd
Original Assignee
Osram Ltd
Osram GEC 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 Osram Ltd, Osram GEC Ltd filed Critical Osram Ltd
Publication of EP0165701A1 publication Critical patent/EP0165701A1/de
Application granted granted Critical
Publication of EP0165701B1 publication Critical patent/EP0165701B1/de
Expired legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01K—ELECTRIC INCANDESCENT LAMPS
    • H01K1/00—Details
    • H01K1/62—One or more circuit elements structurally associated with the lamp
    • 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
    • H05B39/00—Circuit arrangements or apparatus for operating incandescent light sources
    • 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
    • H05B39/00—Circuit arrangements or apparatus for operating incandescent light sources
    • H05B39/04—Controlling
    • H05B39/08—Controlling by shifting phase of trigger voltage applied to gas-filled controlling tubes also in controlled semiconductor devices

Definitions

  • This invention relates to load supply circuits, and particularly to such a circuit enabling low voltage lamps to be used from a high voltage source such as a domestic mains supply, and to lamp modules incorporating such a circuit.
  • a high voltage source such as a domestic mains supply
  • lamp modules incorporating such a circuit.
  • Such circuit is known from document US-A-4359670.
  • a low voltage tungsten-halogen lamp for domestic purposes so as to increase efficiency and decrease power consumption.
  • One way of reducing the mains voltage to that required for the lamp is by using a transformer, but this is rather large and heavy.
  • An alternative method is to use an electronic circuit to step down the voltage. Electronic circuits for reducing voltages are known as in, for example, domestic dimming circuits, but such circuits only operate down to about 50-60 volts.
  • the invention provides a load supply circuit for supplying a load from an a.c. supply, incorporating switch means for switching the load into and out of the supply circuit and control means for triggering said switch means to energise the load in each phase of the a.c. supply, wherein the load is in the form of a tungsten-halogen lamp operable at a voltage which is only a fraction of the a.c. supply, and in that the circuit incorporates an overcurrent trip means which is activated as a result of a fault condition occurring in any half cycle of the supply which results in an excessive current rise, and which remains operative to prevent energisation of the lamp during the remainder of the half cycle.
  • the circuit is integrally assembled in a complete unit to facilitate its use as a direct plug in replacement for a G.L.S. filament lamp.
  • the load is preferably a low voltage tungsten-halogen lamp and the a.c. supply is the domestic mains supply.
  • the switch means is preferably a solid state switch and may conveniently be a Gate Turn Off Thyristor (G.T.O.) or may possibly be a triac.
  • G.T.O. Gate Turn Off Thyristor
  • the control means for triggering the said switch means is preferably an integrated circuit which may also have incorporated therein, means for limiting the surge current when the circuit is first switched on, and/or means for feedback controlling the output of the integrated circuit to withstand varying temperature conditions.
  • the supply circuit includes filter means for reducing radio frequency interference from the mains which can falsely trigger the a.c. switch, and may also include an overcurrent trip means to safeguard the circuit in the event of a short-circuit in the load.
  • the supply circuit may further include means for rectifying the supply voltage.
  • the load supply circuit is positioned, with a low voltage tungsten-halogen lamp as the load, within a lamp replacement unit shaped like an ordinary tungsten lamp and which is a direct replacement for such a lamp.
  • the tungsten-halogen lamp is preferably, however, removeable from said unit and is itself replaceable within the unit.
  • the invention further comprises an overcurrent trip circuit including sensing means to sense the level of current through the part of the circuit to be protected and to produce a first signal consequent to a level of build-up of said current above a predetermined level, and signalling means for producing a second signal upon receiving said first signal, and means responsive to said second signal for effecting the tripping function.
  • said sensing means is a capacitor connected to the base of a transistor and said signalling means is a timer or thyristor also connected to the base of a transistor.
  • the lamp replacement unit shown in Figure 1 comprises a thermoplastic resin base 1 injection moulded to produce a cap 2 positioned at one end, shown lowermost.
  • the cap 2 is of standard size and fitting so that it can be inserted into ordinary domestic lamp sockets, and has two contacts 3 to form the electrical connections with the socket.
  • a component board 4 is contained within the body and thermally insulated from the lamp 6 by being wrapped in a suitable heat resisting and thermally insulating wool 9.
  • the lamp 6 is a low voltage tungsten-halogen lamp and is positioned within socket 7 positioned on a support member 8 fastened to a heat shield 5 between the shield and the board 4.
  • a transparent glass cover 10 surrounds the lamp 6 and is fastened to the base 1.
  • the component board 4 has electronic components mounted thereon, the components 11 forming part of a load supply circuit as shown diagrammatically in Figure 2.
  • the board also has mounted thereon, connections to a Gate Turn-Off Thyristor 12 (G.T.O.) mounted on a heat sink 13 and connections 14 to a mains supply via the contacts 3 on the cap 2 when in place in a socket.
  • G.T.O. Gate Turn-Off Thyristor 12
  • the G.T.O. 12 Gate Turn-Off Thyristor 12
  • the G.T.O. 12 and other components 11 form part of a circuit to power the lamp 6 from the mains supply.
  • the load supply circuit for supplying the low voltage tungsten-halogen lamp 6 from an a.c. mains supply 20 comprises a bridge rectifier part 21, a mains radio frequency interference filter circuit (A), a mains isolated low power d.c. supply circuit (B), a pulse supply part 22, a pulse conversion part 23, an overcurrent trip circuit (C) and a G.T.O. 12.
  • the circuit is designed such that a negative going pulse is provided by the pulse supply part 22 including integrated circuit 25 at a desired phase angle regulated by the variable resistance 24.
  • This pulse is converted from negative going to positive going by the pulse conversion part 23 of the circuit and the positive going pulse is used to trigger the G.T.O. 12 to conduct and switch the lamp 6 on.
  • the G.T.O. automatically turns "off" when the phase angle of the supply reaches zero, so by producing the pulse at an appropriate phase angle, only the controlled part of the cycle will be passed via the G.T.O. to suit the low voltage lamp.
  • the integrated circuit 25 provides this initial pulse and also provides, if necessary, a slow start feature to overcome the problem of initial switch on inrush surge current of the cold filament. Since the G.T.O.
  • circuits (A) and (B) are conventional and will not be further described.
  • the overcurrent trip circuit (C) is shown in more detail in Figure 3 and is basically composed of a sensing part.30 and a signal producing part 31.
  • the sensing part 30 is connected to point X in Figure 2 and comprises a capacitor 32 which passes a voltage if a sharply rising current is passing through point X, for example, in the event of a filament end of life flashover producing a short circuit current. This voltage is passed to the base of a transistor 33 which produces a pulse.
  • the signal producing part 31 receives this pulse at a timer 34 which, with the rest of the components of the signal producing part 31, produces a signal at X' for long enough to turn off the G.T.O. and thus protect the electronic components from a damaging high current.
  • the G.T.O. is only switched off for the partiuclar half-cycle in which the short-circuit occurred and then the normal pulses switch it on again provided the lamp has not gone short circuit or into an arc condition.
  • the timer could be replaced by a small thyristor
  • the invention has been described with the load supply circuit within the lamp replacement unit, it could be positioned in the wall switch or anywhere else as required. Further, the transparent glass cover 10 may be replaced by suitable coloured covers made of similar material and may even if desired be made in novel shapes for decorative purposes.

Landscapes

  • Circuit Arrangement For Electric Light Sources In General (AREA)

Claims (6)

1. Lastspeisungsschaltung zur Speisung einer Last von einer Wechselstromversorgung aus, enthaltend eine Schaltereinrichtung zum Einschalten der Last in die Speisungsschaltung und zum Ausschalten der Last aus der Speisungsschaltung und eine Steuereinrichtung zum Triggern der Schaltereinrichtung zur Energieversorgung der Last in jeder Phase der Wechselstromversorgung, dadurch gekennzeichnet, daß die Last in Form einer Wolfram-Halogenlampe vorgesehen ist, die bei einer Spannung betreibbar ist, welche nur ein Bruchteil der Wechselstromversorgung ist, und daß die Schaltung eine Überstromauslöseeinrichtung enthält, die aufgrund eines in irgendeiner Halbperiode der Versorgung austretenden Störzustands, der in einem übermäßigen Stromanstieg resultiert, aktiviert wird und die wirksam bleibt, um eine Energieversorgung der Lampe während der restlichen Halbperiode zu verhindern.
2. Lastspeisungsschaltung nach Anspruch 1, dadurch gekennzeichnet, daß die Steuereinrichtung zum Triggern der Schaltereinrichtung eine integrierte Schaltung ist, die ferner eine Einrichtung zum Begrenzen des Stoßstroms enthält, wenn der Strom anfangs eingeschaltet wird.
3. Lastspeisungsschaltung nach Anspruch 1 oder 2, dadurch gekennzeichnet, daß die integrierte Schaltung eine Einrichtung zur Rückführungssteuerung des Ausgangs der integrierten Schaltung enthält, um veränderlichen Temperaturbedingungen zu widerstehen.
4. Lastspeisungsschaltung nach Anspruch 1 oder 2, die integral montiert ist in einer vollständigen Lampen-Ersatzeinheit als Ersatz für eine Wolfram-Glühlampe für allgemeine Beleuchtungszwecke.
5. Lastspeisungsschaltung nach Anspruch 4, bei der die Wolfram-Halogen-Niederspannungslampe in der Einheit vorgesehen ist, jedoch innerhalb der Einheit austauschbar ist.
6. Lastspeisungsschaltung nach irgendeinem vorangehenden Anspruch, dadurch gekenneichnet, daß die Überstromauslöseschaltung enthält eine Fühlereinrichtung zum Abfüllen der Größe des Stroms durch den zu schützenden Teil der Schaltung und zum Erzeugen eines ersten Signals aufgrund einer Anstiegsgröße des Stroms über einen vorbestimmten Wert, eine Signalisiereinrichtung zum Erzeugen eines zweiten Signals beim Empfang des ersten Signals und eine auf das zweite Signal ansprechende Einrichtung zum Ausführen der Auslösefunktion der Auslöseschaltung.
EP19850303410 1984-05-18 1985-05-15 Lastspeisungsschaltung und Lampenmodul Expired EP0165701B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB8412699 1984-05-18
GB848412699A GB8412699D0 (en) 1984-05-18 1984-05-18 Load supply circuit and lamp module

Publications (2)

Publication Number Publication Date
EP0165701A1 EP0165701A1 (de) 1985-12-27
EP0165701B1 true EP0165701B1 (de) 1990-10-03

Family

ID=10561150

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19850303410 Expired EP0165701B1 (de) 1984-05-18 1985-05-15 Lastspeisungsschaltung und Lampenmodul

Country Status (3)

Country Link
EP (1) EP0165701B1 (de)
DE (1) DE3579953D1 (de)
GB (2) GB8412699D0 (de)

Families Citing this family (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3605278C1 (de) * 1986-02-19 1987-07-23 Espe Pharm Praep Schaltung zur Speisung eines dentalen Fotopolymerisationsgeraets
US5293028A (en) * 1987-01-05 1994-03-08 General Electric Company Cooktop appliance with improved power control
DE3729305A1 (de) * 1987-09-02 1989-03-16 Philips Patentverwaltung Hochdruckentladungslampe
US4949020A (en) * 1988-03-14 1990-08-14 Warren Rufus W Lighting control system
BE1003655A3 (nl) * 1989-12-18 1992-05-12 Ceuster Ludo De Weergave bord voorzien van een geschakelde voeding.
JP2934923B2 (ja) * 1991-12-06 1999-08-16 林原 健 照明装置
GB2275141B (en) * 1993-02-12 1995-12-06 Lumisphere Products Ltd Warning beacon
DE4402179A1 (de) * 1994-01-26 1995-07-27 Hubertus Landmann Elektrische Glühbirne mit im Sockel eingebauter elektronischer Brenndauerregelung

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
SE7707771L (sv) * 1977-07-05 1979-01-06 Klippberg Olle Knut Sett att driva stralningsalstrande anordningar och anordning for genomforande av settet
DE2831629C2 (de) * 1978-07-19 1983-01-13 Preh, Elektrofeinmechanische Werke, Jakob Preh, Nachf. Gmbh & Co, 8740 Bad Neustadt Elektronische Schaltung zur Helligkeitssteuerung von Lichtquellen
NL7809907A (nl) * 1978-10-02 1980-04-08 Philips Nv Menglichtinrichting.
JPS5665567A (en) * 1979-11-01 1981-06-03 Ricoh Co Ltd Control device for exposure lamp
HU181323B (en) * 1981-05-08 1983-07-28 Egyesuelt Izzolampa High-frequency system of additional resistor for electric discharge lamp
US4547704A (en) * 1983-08-01 1985-10-15 General Electric Company Higher efficiency incandescent lighting units

Also Published As

Publication number Publication date
GB2159009A (en) 1985-11-20
GB2159009B (en) 1988-08-10
DE3579953D1 (de) 1990-11-08
GB8412699D0 (en) 1984-06-27
GB8512337D0 (en) 1985-06-19
EP0165701A1 (de) 1985-12-27

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