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 supplyInfo
- 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
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.
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)
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 |
-
1941
- 1941-06-18 GB GB769541A patent/GB548236A/en not_active Expired
Cited By (3)
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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