GB426201A - Improvements in and relating to the control of electric circuits by gaseous or vapour discharge devices - Google Patents

Improvements in and relating to the control of electric circuits by gaseous or vapour discharge devices

Info

Publication number
GB426201A
GB426201A GB2590133A GB2590133A GB426201A GB 426201 A GB426201 A GB 426201A GB 2590133 A GB2590133 A GB 2590133A GB 2590133 A GB2590133 A GB 2590133A GB 426201 A GB426201 A GB 426201A
Authority
GB
United Kingdom
Prior art keywords
discharge
operating key
source
devices
point
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
GB2590133A
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.)
British Thomson Houston Co Ltd
Original Assignee
British Thomson Houston 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 British Thomson Houston Co Ltd filed Critical British Thomson Houston Co Ltd
Priority to GB2590133A priority Critical patent/GB426201A/en
Publication of GB426201A publication Critical patent/GB426201A/en
Expired legal-status Critical Current

Links

Classifications

    • BPERFORMING OPERATIONS; TRANSPORTING
    • B23MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23KSOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
    • B23K11/00Resistance welding; Severing by resistance heating
    • B23K11/24Electric supply or control circuits therefor
    • B23K11/248Electric supplies using discharge tubes

Abstract

426,201. Control systems for consuming devices; thermionic valve circuits. BRITISH THOMSON - HOUSTON CO., Ltd., Crown House, Aldwych, London, and KNIGHT, H. DE B., 108, Eastlands Road, Rugby. Sept. 19, 1933, No. 25901. [Classes 38 (ii) and 38 (iv)] [See also Group XL] Current impulses of accurately timed short periods are obtained in a circuit by employing one or more vapour electric discharge devices T1, Fig. 2, energized from an A.C. source and each having a bias potential on its grid which is removed to permit it to conduct for the required periods, by the charging current of a condenser C2 flowing through a resistance of predetermined value R3, the point in the cycle of the voltage of the A.C. source at which the condenser C2 commences to charge being determined by timed impulses applied to the grid circuit of a second vapour electric discharge device T3 to remove a bias potential from the grid and cause T3 to conduct. The timed impulses are supplied by a peaky wave transformer P fed from the A.C. source through a phase shifting device F so that. the point in the A.C. voltage wave at which T3 and therefore T1 is rendered conducting when K2 is closed to a can be varied. When the charging cuurent of K2 falls to a predetermined value T1 is again blocked. The bias battery B1 may be dispensed with, a suitable bias potential being obtained from the potentiometer R1, R2. Several modifications are described in which the second discharge device T3 is placed in parallel with the condenser C2 which is normally charged, the necessary charging current being obtained by first discharging it at a selected point in the A.C. voltage wave by means of this second discharge device. Two of these modifications are arranged to produce only one impulse of current for each closure of the operating key. In place of the peaky wave transformer P an alternative arrangement may be used which produces an output voltage of the type shown in Fig. 12. This arrangement comprises a transformer 203, Fig. 13, preferably of high impedance having its primary connected through an operating key K9 across a saturable reactance which is fed from an A.C. source in series with a non saturable reactance. Specifications 420,100 and 423,166 are referred to. The Provisional Specification also describes arrangements in which the timing control circuit is insulated from the circuits of the main discharge devices. When the operating key K7, Fig. 10, is closed the peaky wave transformer P renders T3 conductive at the point selected by the phase shifting device F and C2 begins to charge, causing a vapour discharge device T6 to conduct and short circuit the secondary of P2 and enable P3 to produce voltages in its secondaries which are sufficient to remove the blocking potentials from the grids of the devices T1. When the charging current of C2 has fallen to a value depending on the position of slides Q on resistance R3 the discharge device T4 conducts and discharges C2 causing T1 to be again blocked. If K7 remains closed the operation is repeated. Several modifications are described in one of which only one current impulse is produced for each closure of the operating key. Another arrangement is described in which the main discharge devices are rendered conductive immediately the operating key is closed. Reference has been directed by the Comptroller to Specification 416,374.
GB2590133A 1933-09-19 1933-09-19 Improvements in and relating to the control of electric circuits by gaseous or vapour discharge devices Expired GB426201A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB2590133A GB426201A (en) 1933-09-19 1933-09-19 Improvements in and relating to the control of electric circuits by gaseous or vapour discharge devices

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB2590133A GB426201A (en) 1933-09-19 1933-09-19 Improvements in and relating to the control of electric circuits by gaseous or vapour discharge devices

Publications (1)

Publication Number Publication Date
GB426201A true GB426201A (en) 1935-03-19

Family

ID=10235180

Family Applications (1)

Application Number Title Priority Date Filing Date
GB2590133A Expired GB426201A (en) 1933-09-19 1933-09-19 Improvements in and relating to the control of electric circuits by gaseous or vapour discharge devices

Country Status (1)

Country Link
GB (1) GB426201A (en)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2477770A (en) * 1944-04-03 1949-08-02 Cutler Hammer Inc Electronic timing and recording means
US2489312A (en) * 1944-01-04 1949-11-29 Us Sec War Oscilloscope sweep circuit
US2506529A (en) * 1946-09-12 1950-05-02 Electrodyne Co Electronic pulse generator
US2745205A (en) * 1949-08-10 1956-05-15 Siemens Ag Electrical fishing equipments

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2489312A (en) * 1944-01-04 1949-11-29 Us Sec War Oscilloscope sweep circuit
US2477770A (en) * 1944-04-03 1949-08-02 Cutler Hammer Inc Electronic timing and recording means
US2506529A (en) * 1946-09-12 1950-05-02 Electrodyne Co Electronic pulse generator
US2745205A (en) * 1949-08-10 1956-05-15 Siemens Ag Electrical fishing equipments

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