GB1080203A - Improvements in or relating to switching circuits employing static switching devices - Google Patents

Improvements in or relating to switching circuits employing static switching devices

Info

Publication number
GB1080203A
GB1080203A GB2154065A GB2154065A GB1080203A GB 1080203 A GB1080203 A GB 1080203A GB 2154065 A GB2154065 A GB 2154065A GB 2154065 A GB2154065 A GB 2154065A GB 1080203 A GB1080203 A GB 1080203A
Authority
GB
United Kingdom
Prior art keywords
devices
conducting
thyristors
current
switching
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
GB2154065A
Inventor
Leslie Kenneth Holmes
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.)
Automatic Telephone and Electric Co Ltd
Original Assignee
Automatic Telephone and Electric Co 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 Automatic Telephone and Electric Co Ltd filed Critical Automatic Telephone and Electric Co Ltd
Priority to GB2154065A priority Critical patent/GB1080203A/en
Publication of GB1080203A publication Critical patent/GB1080203A/en
Expired legal-status Critical Current

Links

Classifications

    • 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)
  • Emergency Protection Circuit Devices (AREA)

Abstract

1,080,203. Road-traffic signals. AUTOMATIC TELEPHONE & ELECTRIC CO. Ltd. May 17, 1966 [May 21, 1965], No. 21540/65. Heading G4Q. [Also in Division H2] In a switching circuit, e.g. for road traffic signalling systems, having two static switching devices TH1, TH2 connected to control the non-concurrent energization of two loads GLNS and GLEW, the devices TH1, TH2 are connected in series with a fuse F and a unilateral conducting device D1 so that should both devices TH1, TH2 be conducting at the same time due to a fault condition, current flowing in the series circuit will blow the fuse. Normally the device TH1 is rendered conducting by a driver unit DU1 to energize the load GLNS and the device TH2 is rendered conducting by a driver unit DU2 to energize the load GLEW. The devices TH1, TH2 may be thyristors, in which case the supply is the unsmoothed output of a full-wave rectifier fed from A.C. mains. A resistor R1 causes a standing current to flow so that no excessive current surges result when a thyristor is switched on, and a resistor R2 limits the current when both thyristors are conducting at the same time due to a faulty thyristor or due to faulty control of the thyristors.
GB2154065A 1965-05-21 1965-05-21 Improvements in or relating to switching circuits employing static switching devices Expired GB1080203A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB2154065A GB1080203A (en) 1965-05-21 1965-05-21 Improvements in or relating to switching circuits employing static switching devices

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB2154065A GB1080203A (en) 1965-05-21 1965-05-21 Improvements in or relating to switching circuits employing static switching devices

Publications (1)

Publication Number Publication Date
GB1080203A true GB1080203A (en) 1967-08-23

Family

ID=10164615

Family Applications (1)

Application Number Title Priority Date Filing Date
GB2154065A Expired GB1080203A (en) 1965-05-21 1965-05-21 Improvements in or relating to switching circuits employing static switching devices

Country Status (1)

Country Link
GB (1) GB1080203A (en)

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