GB1409213A - Electrical safety circuit - Google Patents

Electrical safety circuit

Info

Publication number
GB1409213A
GB1409213A GB5237873A GB5237873A GB1409213A GB 1409213 A GB1409213 A GB 1409213A GB 5237873 A GB5237873 A GB 5237873A GB 5237873 A GB5237873 A GB 5237873A GB 1409213 A GB1409213 A GB 1409213A
Authority
GB
United Kingdom
Prior art keywords
nov
amplifiers
safety circuit
electrical safety
switches
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
GB5237873A
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 Electronics UK Ltd
Original Assignee
Philips Electronic and Associated 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 Electronic and Associated Industries Ltd filed Critical Philips Electronic and Associated Industries Ltd
Publication of GB1409213A publication Critical patent/GB1409213A/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
    • H02H11/00—Emergency protective circuit arrangements for preventing the switching-on in case an undesired electric working condition might result
    • G—PHYSICS
    • G08—SIGNALLING
    • G08G—TRAFFIC CONTROL SYSTEMS
    • G08G1/00—Traffic control systems for road vehicles
    • G08G1/097—Supervising of traffic control systems, e.g. by giving an alarm if two crossing streets have green light simultaneously

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Traffic Control Systems (AREA)
  • Amplifiers (AREA)
  • Train Traffic Observation, Control, And Security (AREA)

Abstract

1409213 Road-traffic signal control PHILIPS ELECTRONIC & ASSOCIATED INDUSTRIES Ltd 12 Nov 1973 [15 Nov 1972] 52378/73 Heading G4Q [Also in Division H2] To detect simultaneous actuation of two "antagonistic" units L 1 , L 2 (e.g. traffic lights of the same colour) a circuit arrangement incorporates static switches S1, S2 (e.g. triacs) associated with two amplification channels 12, 13 each including two amplifiers (20, 21 and 22, 23 respectively) in cascade, the D.C. supplies (26, 27 and 30, 31) to which comprise rectifiers (32, 33 and 34, 35) oppositely-poled. The supply circuits detect the status of switches S1, S2 and the amplifiers act as logic circuits. The operation is described with reference to a table, Fig. 2 (not shown).
GB5237873A 1972-11-15 1973-11-12 Electrical safety circuit Expired GB1409213A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR7240508A FR2206609B1 (en) 1972-11-15 1972-11-15

Publications (1)

Publication Number Publication Date
GB1409213A true GB1409213A (en) 1975-10-08

Family

ID=9107196

Family Applications (1)

Application Number Title Priority Date Filing Date
GB5237873A Expired GB1409213A (en) 1972-11-15 1973-11-12 Electrical safety circuit

Country Status (4)

Country Link
US (1) US3857061A (en)
DE (1) DE2353969A1 (en)
FR (1) FR2206609B1 (en)
GB (1) GB1409213A (en)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3107090A1 (en) * 1981-02-25 1982-09-09 Siemens AG, 1000 Berlin und 8000 München Method and circuit arrangement for monitoring AC-fed traffic signal systems
EP0214692B1 (en) * 1985-09-05 1991-12-04 Koninklijke Philips Electronics N.V. Monitoring a conflict detector for traffic-lights

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1285396A (en) * 1961-01-12 1962-02-23 Westinghouse Electric Corp Further development of trip circuits intended to protect semiconductor switches
US3355601A (en) * 1965-10-22 1967-11-28 Franz Baumgartner Fabrik Elek Supervisory control system using a ferrite transformer and a transistor
GB1143687A (en) * 1966-12-07 1900-01-01
DE1588410C3 (en) * 1967-02-01 1974-01-03 Licentia Patent-Verwaltungs-Gmbh, 6000 Frankfurt Circuit arrangement for fail-safe monitoring of the switching status of at least two switching paths
DE1613832B1 (en) * 1967-05-17 1971-01-07 Licentia Gmbh Protective device for multiple drives

Also Published As

Publication number Publication date
US3857061A (en) 1974-12-24
DE2353969A1 (en) 1974-05-22
FR2206609A1 (en) 1974-06-07
FR2206609B1 (en) 1975-11-07

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Legal Events

Date Code Title Description
PS Patent sealed [section 19, patents act 1949]
PCNP Patent ceased through non-payment of renewal fee