GB757359A - Improvements in and relating to the control of electric circuits - Google Patents

Improvements in and relating to the control of electric circuits

Info

Publication number
GB757359A
GB757359A GB266354A GB266354A GB757359A GB 757359 A GB757359 A GB 757359A GB 266354 A GB266354 A GB 266354A GB 266354 A GB266354 A GB 266354A GB 757359 A GB757359 A GB 757359A
Authority
GB
United Kingdom
Prior art keywords
voltage
lamps
source
time
jan
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
GB266354A
Inventor
Charles Rivers Passmore
William Robert Bloxsidge
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.)
Thorn Electrical Industries Ltd
Original Assignee
Thorn Electrical Industries 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 Thorn Electrical Industries Ltd filed Critical Thorn Electrical Industries Ltd
Priority to GB266354A priority Critical patent/GB757359A/en
Publication of GB757359A publication Critical patent/GB757359A/en
Expired legal-status Critical Current

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
    • H05B41/36—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
    • H05B41/3921—Controlling the intensity of light continuously using semiconductor devices, e.g. thyristor with possibility of light intensity variations

Landscapes

  • Discharge-Lamp Control Circuits And Pulse- Feed Circuits (AREA)

Abstract

757,359. Dimming control systems for lamps. THORN ELECTRICAL INDUSTRIES, Ltd. Jan. 5, 1955 [Jan. 28, 1954; June 14, 1954], Nos. 2663/54 and 17471/54. Drawings to Specification. Class 38 (4). In a dimming control system for incandescent or fluorescent lamps wherein the lamps are supplied from an A.C. source through discharge valves, preferably arranged back-to-back, controlled by variation of a D.C. grid voltage which is superimposed upon an A.C. hold-off voltage, sudden changes of brightness, due to, say, coarseness of the D.C. voltage controller, are avoided by the provision of a time delay network at the output terminals of the variable D.C. voltage source. The time constants may be different for falling and rising voltages. Separate D.C. voltage sources and time constant circuits are preferably provided for each valve in the case of a back-to-back pair, the grid circuits of the two valves being inductively coupled to provide for still smoother control. Such coupling may be provided by a double wound relay having its windings connected, respectively, to the two time-constant networks and the relay functioning to disconnect the lamps from the A.C. source and to interrupt the supply of heater current when the discharge currents of the networks reach a low value.
GB266354A 1954-01-28 1954-01-28 Improvements in and relating to the control of electric circuits Expired GB757359A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB266354A GB757359A (en) 1954-01-28 1954-01-28 Improvements in and relating to the control of electric circuits

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB266354A GB757359A (en) 1954-01-28 1954-01-28 Improvements in and relating to the control of electric circuits

Publications (1)

Publication Number Publication Date
GB757359A true GB757359A (en) 1956-09-19

Family

ID=9743571

Family Applications (1)

Application Number Title Priority Date Filing Date
GB266354A Expired GB757359A (en) 1954-01-28 1954-01-28 Improvements in and relating to the control of electric circuits

Country Status (1)

Country Link
GB (1) GB757359A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1176279B (en) * 1960-06-27 1964-08-20 Triflux Soc Circuit arrangement for supplying gas discharge lamps or fluorescent lamps with alternating current of higher frequency

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1176279B (en) * 1960-06-27 1964-08-20 Triflux Soc Circuit arrangement for supplying gas discharge lamps or fluorescent lamps with alternating current of higher frequency

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