GB724637A - Improvements in or relating to lighting and like circuits - Google Patents

Improvements in or relating to lighting and like circuits

Info

Publication number
GB724637A
GB724637A GB23568/53A GB2356853A GB724637A GB 724637 A GB724637 A GB 724637A GB 23568/53 A GB23568/53 A GB 23568/53A GB 2356853 A GB2356853 A GB 2356853A GB 724637 A GB724637 A GB 724637A
Authority
GB
United Kingdom
Prior art keywords
relay
coil
relays
unoperated
impedance
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
GB23568/53A
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 Electrical Industries Ltd
Original Assignee
Philips 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 Philips Electrical Industries Ltd filed Critical Philips Electrical Industries Ltd
Publication of GB724637A publication Critical patent/GB724637A/en
Expired legal-status Critical Current

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B64—AIRCRAFT; AVIATION; COSMONAUTICS
    • B64F—GROUND OR AIRCRAFT-CARRIER-DECK INSTALLATIONS SPECIALLY ADAPTED FOR USE IN CONNECTION WITH AIRCRAFT; DESIGNING, MANUFACTURING, ASSEMBLING, CLEANING, MAINTAINING OR REPAIRING AIRCRAFT, NOT OTHERWISE PROVIDED FOR; HANDLING, TRANSPORTING, TESTING OR INSPECTING AIRCRAFT COMPONENTS, NOT OTHERWISE PROVIDED FOR
    • B64F1/00—Ground or aircraft-carrier-deck installations
    • B64F1/18—Visual or acoustic landing aids
    • B64F1/20—Arrangement of optical beacons
    • 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
    • H05B47/00—Circuit arrangements for operating light sources in general, i.e. where the type of light source is not relevant
    • H05B47/10—Controlling the light source

Landscapes

  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Acoustics & Sound (AREA)
  • Mechanical Engineering (AREA)
  • Aviation & Aerospace Engineering (AREA)
  • Control Of Electrical Variables (AREA)

Abstract

724,637. Switching systems; transformer systems. PHILIPS ELECTRICAL INDUSTRIES, Ltd. Aug. 26, 1953 [Aug. 29, 1952], No. 23568/53. Class 38 (4). In a variable voltage supply system for an aerodrome lighting, or other, load 10 as described in Specification 721,112, the manuallyoperated switches 20-22 controlling the tapchanging relays 14-16 are now in the form of push-buttons and the relays have further auxiliary contacts 28-30 which maintain the relay energized after release of the associated push button. Further, the ratio of the impedance of the coil of an operated relay to its impedance in the inoperative condition of the relay is now made such that the voltage reduction across the coil of an operated relay consequent upon the connection in parallel therewith of the coil of an unoperated relay is sufficient to cause release of the operated relay, so that the condenser 24 becomes effective to boost the coil current of the unoperated relay to a pull-in value and so effect a tap change. A tuning condenser 31 automatically switched across any operated relay assists in obtaining the necessary impedance ratio. The push buttons may be located remote from the relays, say at 33, necessitating long connecting leads 32, in which case compensation for voltage loss in the leads may be obtained by arranging that the overall reactance of the series-connected elements 23, 24 is capacitative and resonates with the inductive reactance of any relay in its unoperated condition.
GB23568/53A 1952-08-29 1953-08-26 Improvements in or relating to lighting and like circuits Expired GB724637A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
NL724637X 1952-08-29

Publications (1)

Publication Number Publication Date
GB724637A true GB724637A (en) 1955-02-23

Family

ID=19817753

Family Applications (1)

Application Number Title Priority Date Filing Date
GB23568/53A Expired GB724637A (en) 1952-08-29 1953-08-26 Improvements in or relating to lighting and like circuits

Country Status (1)

Country Link
GB (1) GB724637A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0040339A1 (en) * 1980-05-17 1981-11-25 Dieter Christiansen A centrally controlled lighting installation having a plurality of individually-switchable individual light points, central switch elements and individual light switches therefor
GB2323982A (en) * 1997-04-01 1998-10-07 Xerox Corp Mains flicker reduction

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0040339A1 (en) * 1980-05-17 1981-11-25 Dieter Christiansen A centrally controlled lighting installation having a plurality of individually-switchable individual light points, central switch elements and individual light switches therefor
GB2323982A (en) * 1997-04-01 1998-10-07 Xerox Corp Mains flicker reduction

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