GB548236A - Improvements in or relating to apparatus and methods for limiting the duration of anelectric current to a period of time not exceeding one-half cycle of an alternating current mains supply - Google Patents

Improvements in or relating to apparatus and methods for limiting the duration of anelectric current to a period of time not exceeding one-half cycle of an alternating current mains supply

Info

Publication number
GB548236A
GB548236A GB769541A GB769541A GB548236A GB 548236 A GB548236 A GB 548236A GB 769541 A GB769541 A GB 769541A GB 769541 A GB769541 A GB 769541A GB 548236 A GB548236 A GB 548236A
Authority
GB
United Kingdom
Prior art keywords
ignition
condenser
potential
period
current
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
GB769541A
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.)
Ferranti International PLC
Original Assignee
Ferranti PLC
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 Ferranti PLC filed Critical Ferranti PLC
Priority to GB769541A priority Critical patent/GB548236A/en
Publication of GB548236A publication Critical patent/GB548236A/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03K—PULSE TECHNIQUE
    • H03K17/00—Electronic switching or gating, i.e. not by contact-making and –breaking
    • H03K17/28—Modifications for introducing a time delay before switching
    • H03K17/288—Modifications for introducing a time delay before switching in tube switches

Landscapes

  • Generation Of Surge Voltage And Current (AREA)

Abstract

548,236. Control systems for resistance welding &c. FERRANTI, Ltd., and ATKINSON, L. June 18, 1941, No. 7695. [Class 38 (iv)] Switching and thermionic control. Current is supplied from A.C. mains for a period limited to a half-cycle through an ignition 7, the ignition electrode 10 of which is in the charging and discharging circuits of a condenser 12. During negative half waves of potential on the anode of the ignition the condenser is charged through a half wave rectifier 15. A gas filled relay valve is arranged to discharge the condenser during a single positive half wave of potential on the ignition. As shown the relay valve 18 requires excitation of both of two control electrodes 21, 28 to become conductive. The valve 18 fires when the condenser potential through the potentiometer 20 sufficiently excites electrode 28 and when a switch 26 is opened to permit the peaky wave output of a transformer 25 to excite electrode 21. The instant of ignition is determined by a phase shifting circuit (not shown) supplying the transformer 25 and the current period is terminated by the reduction of anode potential on the ignition. In an alternative arrangement the switch 26 is placed in series with the potentiometer 20.
GB769541A 1941-06-18 1941-06-18 Improvements in or relating to apparatus and methods for limiting the duration of anelectric current to a period of time not exceeding one-half cycle of an alternating current mains supply Expired GB548236A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB769541A GB548236A (en) 1941-06-18 1941-06-18 Improvements in or relating to apparatus and methods for limiting the duration of anelectric current to a period of time not exceeding one-half cycle of an alternating current mains supply

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB769541A GB548236A (en) 1941-06-18 1941-06-18 Improvements in or relating to apparatus and methods for limiting the duration of anelectric current to a period of time not exceeding one-half cycle of an alternating current mains supply

Publications (1)

Publication Number Publication Date
GB548236A true GB548236A (en) 1942-10-01

Family

ID=9838009

Family Applications (1)

Application Number Title Priority Date Filing Date
GB769541A Expired GB548236A (en) 1941-06-18 1941-06-18 Improvements in or relating to apparatus and methods for limiting the duration of anelectric current to a period of time not exceeding one-half cycle of an alternating current mains supply

Country Status (1)

Country Link
GB (1) GB548236A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2428592A (en) * 1944-08-15 1947-10-07 Westinghouse Electric Corp Electronic control circuits
US2785342A (en) * 1954-04-06 1957-03-12 William S Carley Pulse polarity reversing circuit for negative input pulses
US3036260A (en) * 1956-11-10 1962-05-22 Schlatter Ag Arrangement for controlling a.c. circuits

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2428592A (en) * 1944-08-15 1947-10-07 Westinghouse Electric Corp Electronic control circuits
US2785342A (en) * 1954-04-06 1957-03-12 William S Carley Pulse polarity reversing circuit for negative input pulses
US3036260A (en) * 1956-11-10 1962-05-22 Schlatter Ag Arrangement for controlling a.c. circuits

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