US3829735A - Airfield lighting circuit arrangements - Google Patents

Airfield lighting circuit arrangements Download PDF

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Publication number
US3829735A
US3829735A US00324943A US32494373A US3829735A US 3829735 A US3829735 A US 3829735A US 00324943 A US00324943 A US 00324943A US 32494373 A US32494373 A US 32494373A US 3829735 A US3829735 A US 3829735A
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US
United States
Prior art keywords
loop
arrangement according
circuit arrangement
lighting circuit
airfield lighting
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Expired - Lifetime
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US00324943A
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English (en)
Inventor
M Berlock
T Dobrowolski
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BAE Systems Defence Systems Ltd
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Plessey Handel und Investments AG
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Assigned to PLESSEY OVERSEAS LIMITED reassignment PLESSEY OVERSEAS LIMITED ASSIGNMENT OF ASSIGNORS INTEREST. Assignors: PLESSEY HANDEL UND INVESTMENTS AG, GARTENSTRASSE 2, ZUG, SWITZERLAND
Assigned to SIEMENS PLESSEY ELECTRONIC SYSTEMS LIMITED reassignment SIEMENS PLESSEY ELECTRONIC SYSTEMS LIMITED ASSIGNMENT OF ASSIGNORS INTEREST. Assignors: PLESSEY OVERSEAS LIMITED
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Expired - Lifetime legal-status Critical Current

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    • 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
    • H05B47/20—Responsive to malfunctions or to light source life; for protection
    • H05B47/23—Responsive to malfunctions or to light source life; for protection of two or more light sources connected in series

Definitions

  • the individual lamps used in airfield lighting for illuminating perimeter runways, lane routes, etc. are normally connected in one or more series loop circuits fed from a constant current regulator (C.C.'R.) and it is becoming increasingly important to know that no more than a fixed percentage of lamps fail at any one time.
  • the present invention is directedto circuit arrangements for affording an indication of the number of failures due to open circuit lamps in such a circuit.
  • a circuit arrangement comprising power supply means for supplying power to a loop circuit which includes a plurality of lighting units, and means for affording an output signal in dependence upon the phase difference between the loop current and the loop supply voltage.
  • the output signal thus afforded is indicative of the number of open circuit lighting units in said loop circuit.
  • the output signal will be afforded in dependence upon the power factor of the circuit arrangement.
  • the means for affording the output signal in dependence upon the phase difference between the loop current and the loop supply voltage will comprise balanced modulator means to which voltage waveforms corresponding to the loop current and loop supply voltage are applied, said modulator means affording an output signal which is indicative of the phase difference between said voltage waveforms.
  • the means for affording the output signal in dependence upon the phase difference between the loop current and the loop supply voltage will comprise gating means to which voltage waveforms corresponding to the loop current and loop supply voltage are applied, the gating means affording an output signal which is indicative of the phase difference between said voltage waveform.
  • the gating means will comprise a first gate which is arranged to be turned on" by one of the voltage waveforms applied thereto and off by the other of the voltage waveforms applied thereto, and a second gate connected in series with a fullwave rectified alternating current signal and operable under the control of the first gate for affording an output signal which, when integrated, is proportional to the volt/seconds of the open circuit lamp units in the loop circuit.
  • Advantageously level detector means e.g. cross-over detectors may be provided operable individually on the voltage waveforms corresponding to the loop current and loop supply voltage respectively, the output from the level detector means being used to control the first gate.
  • the output signal may be used to cause indicator means to be operated and conveniently means associated with the output signal may be provided whereby an indicated output is only afforded when a predetennined number of lighting units have become open circuit.
  • each of the lighting units may comprise a lamp connected in the loop circuit via an isolating transformer and advantageously the power supply to the loop circuit may be afforded by a constant current regulator.
  • FIG. 1 is a partially block schematic circuit diagram of one form of circuit arrangement according to the present invention
  • FIG. 2 is a partially block schematic circuit diagram of another form of circuit arrangement according to the present invention.
  • FIG. 3 shows waveforms existing at various points in the arrangement of FIG. 2.
  • part of a series loop lighting circuit l which includes two lamps 2 each fed by individual isolating transformers 3, the primary windings of which are connected in series with the loop.
  • the loop is fed from a constant current regulator CCR of conventional form, the output transformer of which is shown at 4, the lighting circuit 1 being connected to a secondary winding 5 of the output transformer 4.
  • the power factor of the lighting circuit is fixed by the components used in the series loop and the leakage inductance of the CCR output transformer 4.
  • a lamp failure nearly always results in the lamp going open circuit with the result that the power factor and hence the phase difference between the loop current and loop supply voltage is modified. Therefore by monitoring this phase difference an indication can be obtained of the number of lamps or isolating transformers that have failed by going open circuit.
  • a balanced modulator 6 is provided which is arranged to compare the phase of the supply voltage with the phase of the loop current.
  • a signal proportional to the supply voltage is derived from the output transformer 4 of the constant current regulator v CCR by means of an additional secondary winding 7 and a signal proportional to the loop current is obtained by means of a further transformer 8 connected in series with the loop 1.
  • the outputs from the secondary winding 7 and the transformer 8 are applied to a balanced modulator 6 of conventional form the net output Vo from which will be zero when the power factor is unity.
  • the power factor of the circuit arrangement with all the lamps working would normally be in the region of 0.95 but this will be modified when one or more of the lamps 2 or isolating transformers 3 go open circuit and consequently an output will be obtained from the balanced modulator 6 which is proportional to the number of open circuit lamps etc.
  • the output Vo of the balanced modulator 6 is applied via a potentiometer 9 to an amplifier 10 in which it may be smoothed and amplified and used to cause a relay 11 to be operated, relay contacts 12 of the relay being used to actuate any convenient form of indicator, alarm etc.
  • the relay 11 is caused to operate when the maximum number of lamp failures has occurred.
  • the output transformer 20 of a constant current regulator CCR is shown having three output windings, output winding 21 for supplying a series loop circuit 1 as in the arrangement of FIG. 1 and two further output windings 22 and 23 as will hereinafter be described.
  • a current transformer 8 is connected in series with the loop circuit 1 also as in the arrangement of FIG. 1. The output from the winding 22 of transformer (shown in FIG. 3 (a)) and the output from the current transformer 8 (shown in FIG.
  • the signal from the gate 26 is used to operate a second gate 27 which is connected in series with a full-wave rectified sinusoidal supply derived from output winding 23 of the output transformer 20 and a bridge rectifier 28.
  • the output voltage from gate 27, shown in FIG. 3 (d) is then integrated by means of integrator 29 to afford an output signal at terminals 30 which is proportional to the volt/seconds of the number of open circuit lamps in the series lighting circuit.
  • the output afforded at terminals 30 may be used to cause a suitable indicator to be operated.
  • An airfield lighting circuit arrangement comprising a'plurality of lighting units connected in the form of a loop circuit, power supply means for supplying power to the loop circuit, and gating means to which voltage waveforms corresponding to the loop current and the loop supply voltage are applied, the gating means affording an output signal which is indicative of the phase difference between said voltage waveforms.
  • the gating means comprises a first gate which is arranged to be turned on by one of the voltage waveforms applied thereto and off by the other of the voltage waveforms applied thereto, and a second gate connected in series with a fullwave rectified alternating current signal and operable under the control of the first gate for affording the output signal.
  • An airfield lighting circuit arrangement comprising level detector means operable individually on the voltage waveforms corresponding to the loop current and loop supply voltage respectively, the output from the level detector means being used to control the first gate.
  • level detector means take the form of crossover detectors.
  • An airfield lighting circuit arrangement in which the output signal is integrated to afford an output which is proportional to the volt- /secononds of the open circuit lighting units in the loop circuit.
  • An airfield lighting circuit arrangement according to claim 1, comprising indicator means which is caused to be operated by the output signal.
  • An airfield lighting circuit arrangement comprising means associated with the output signal whereby an indicated output is only afforded when a predetermined number of lighting units have become open circuit.
  • each of the lighting units comprise a lamp connected in the loop circuit via an isolated transformer.

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  • Circuit Arrangement For Electric Light Sources In General (AREA)
US00324943A 1972-01-28 1973-01-19 Airfield lighting circuit arrangements Expired - Lifetime US3829735A (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB401272A GB1379077A (en) 1972-01-28 1972-01-28 Airfield lighting circuit arrangements
GB1744672 1972-04-14

Publications (1)

Publication Number Publication Date
US3829735A true US3829735A (en) 1974-08-13

Family

ID=26238753

Family Applications (1)

Application Number Title Priority Date Filing Date
US00324943A Expired - Lifetime US3829735A (en) 1972-01-28 1973-01-19 Airfield lighting circuit arrangements

Country Status (7)

Country Link
US (1) US3829735A (fr)
BE (1) BE794608A (fr)
DE (1) DE2303655A1 (fr)
FR (1) FR2169287B1 (fr)
GB (1) GB1379077A (fr)
IT (1) IT978546B (fr)
SE (1) SE384963B (fr)

Cited By (17)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4138627A (en) * 1975-09-02 1979-02-06 Hughey And Phillips, Inc. Current-level-sensitive switching system
US4295079A (en) * 1979-04-19 1981-10-13 Tokyo Shibaura Denki Kabushiki Kaisha Lamp circuit with disconnected lamp detecting device
US4330778A (en) * 1979-03-13 1982-05-18 Tokyo Shibaura Denki Kabushiki Kaisha Device for detecting broken filaments in lamps
US4441055A (en) * 1980-06-10 1984-04-03 Kaunassky Politekhnichesky Institut Lighting system
US4449073A (en) * 1982-06-14 1984-05-15 Multi Electric Mfg. Inc. Runway approach lighting system with fault monitor
US5034659A (en) * 1989-07-31 1991-07-23 Kabushiki Kaisha Toshiba Lamp circuit with disconnected lamp detecting device
DE4110990A1 (de) * 1991-04-05 1992-10-08 Standard Elektrik Lorenz Ag Einrichtung zur pruefung von signallampen in eisenbahnanlagen
US5168198A (en) * 1990-03-20 1992-12-01 Kabushiki Kaisha Toshiba Lamplight failure detection system
US5638057A (en) * 1994-05-09 1997-06-10 Adb-Alnaco, Inc. Ground fault detection and measurement system for airfield lighting system
US5872457A (en) * 1994-05-09 1999-02-16 Adb-Alnaco, Inc. Method and apparatus for separating and analyzing composite AC/DC waveforms
WO2001063976A1 (fr) * 2000-02-21 2001-08-30 Siemens Aktiengesellschaft Systeme d'indication de defaillances de lampes et d'indication d'isolation
US6305602B1 (en) 1997-12-01 2001-10-23 Diebold, Incorporated Light monitoring system and method for automated transaction machine
US6911777B1 (en) * 2003-08-14 2005-06-28 Cooper Industries, Inc. Clamp-on low power isolation transformer for airfield lighting
US7068188B1 (en) 2004-06-08 2006-06-27 Controlled Power Company Runway approach lighting system and method
US7088263B1 (en) 2004-06-08 2006-08-08 Controlled Power Company Runway approach lighting system and method
US9008992B2 (en) 2011-03-25 2015-04-14 Thomas & Betts International, Inc. Testing and monitoring an electrical system
US10516294B2 (en) 2015-02-09 2019-12-24 Eaton Intelligent Power Limited Uninterruptible constant current regulator

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2829135C2 (de) * 1978-07-03 1982-09-02 Siemens AG, 1000 Berlin und 8000 München Überwachungseinrichtung für den Lampenausfall bei einer Flugplatzbefeuerung
DK146840C (da) 1979-04-04 1984-07-02 Albertus Christian Kontrolapparat, fortrinsvis anvendeligt til indikering af antallet af overbraendte lamper i en lufthavns belysningsanlaeg

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3061828A (en) * 1958-03-11 1962-10-30 Basic Products Corp Circuit means
BE759346A (fr) * 1969-11-28 1971-04-30 Jeumont Schneider Procede et dispositif de regulation automatique

Cited By (17)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4138627A (en) * 1975-09-02 1979-02-06 Hughey And Phillips, Inc. Current-level-sensitive switching system
US4330778A (en) * 1979-03-13 1982-05-18 Tokyo Shibaura Denki Kabushiki Kaisha Device for detecting broken filaments in lamps
US4295079A (en) * 1979-04-19 1981-10-13 Tokyo Shibaura Denki Kabushiki Kaisha Lamp circuit with disconnected lamp detecting device
US4441055A (en) * 1980-06-10 1984-04-03 Kaunassky Politekhnichesky Institut Lighting system
US4449073A (en) * 1982-06-14 1984-05-15 Multi Electric Mfg. Inc. Runway approach lighting system with fault monitor
US5034659A (en) * 1989-07-31 1991-07-23 Kabushiki Kaisha Toshiba Lamp circuit with disconnected lamp detecting device
US5168198A (en) * 1990-03-20 1992-12-01 Kabushiki Kaisha Toshiba Lamplight failure detection system
DE4110990A1 (de) * 1991-04-05 1992-10-08 Standard Elektrik Lorenz Ag Einrichtung zur pruefung von signallampen in eisenbahnanlagen
US5638057A (en) * 1994-05-09 1997-06-10 Adb-Alnaco, Inc. Ground fault detection and measurement system for airfield lighting system
US5872457A (en) * 1994-05-09 1999-02-16 Adb-Alnaco, Inc. Method and apparatus for separating and analyzing composite AC/DC waveforms
US6305602B1 (en) 1997-12-01 2001-10-23 Diebold, Incorporated Light monitoring system and method for automated transaction machine
WO2001063976A1 (fr) * 2000-02-21 2001-08-30 Siemens Aktiengesellschaft Systeme d'indication de defaillances de lampes et d'indication d'isolation
US6911777B1 (en) * 2003-08-14 2005-06-28 Cooper Industries, Inc. Clamp-on low power isolation transformer for airfield lighting
US7068188B1 (en) 2004-06-08 2006-06-27 Controlled Power Company Runway approach lighting system and method
US7088263B1 (en) 2004-06-08 2006-08-08 Controlled Power Company Runway approach lighting system and method
US9008992B2 (en) 2011-03-25 2015-04-14 Thomas & Betts International, Inc. Testing and monitoring an electrical system
US10516294B2 (en) 2015-02-09 2019-12-24 Eaton Intelligent Power Limited Uninterruptible constant current regulator

Also Published As

Publication number Publication date
BE794608A (fr) 1973-05-16
IT978546B (it) 1974-09-20
GB1379077A (en) 1975-01-02
FR2169287B1 (fr) 1978-03-03
DE2303655A1 (de) 1973-08-02
FR2169287A1 (fr) 1973-09-07
SE384963B (sv) 1976-05-24

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Owner name: SIEMENS PLESSEY ELECTRONIC SYSTEMS LIMITED, ENGLAN

Free format text: ASSIGNMENT OF ASSIGNORS INTEREST.;ASSIGNOR:PLESSEY OVERSEAS LIMITED;REEL/FRAME:005454/0528

Effective date: 19900717