GB1004244A - Electric switching means - Google Patents
Electric switching meansInfo
- Publication number
- GB1004244A GB1004244A GB689663A GB689663A GB1004244A GB 1004244 A GB1004244 A GB 1004244A GB 689663 A GB689663 A GB 689663A GB 689663 A GB689663 A GB 689663A GB 1004244 A GB1004244 A GB 1004244A
- Authority
- GB
- United Kingdom
- Prior art keywords
- transistor
- transformer
- pulses
- base
- build
- 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
-
- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05F—SYSTEMS FOR REGULATING ELECTRIC OR MAGNETIC VARIABLES
- G05F1/00—Automatic systems in which deviations of an electric quantity from one or more predetermined values are detected at the output of the system and fed back to a device within the system to restore the detected quantity to its predetermined value or values, i.e. retroactive systems
- G05F1/10—Regulating voltage or current
- G05F1/12—Regulating voltage or current wherein the variable actually regulated by the final control device is ac
- G05F1/40—Regulating voltage or current wherein the variable actually regulated by the final control device is ac using discharge tubes or semiconductor devices as final control devices
- G05F1/44—Regulating voltage or current wherein the variable actually regulated by the final control device is ac using discharge tubes or semiconductor devices as final control devices semiconductor devices only
- G05F1/45—Regulating voltage or current wherein the variable actually regulated by the final control device is ac using discharge tubes or semiconductor devices as final control devices semiconductor devices only being controlled rectifiers in series with the load
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- General Physics & Mathematics (AREA)
- Radar, Positioning & Navigation (AREA)
- Automation & Control Theory (AREA)
- Dc-Dc Converters (AREA)
Abstract
1,004,244. Switching circuits. ENGLISH ELECTRIC CO. Ltd. May 20, 1964 [Feb. 20, 1963], No. 6896/63. Heading H3T. [Also in Division H2] A " ringing choke " oscillator for supplying pulses to control the firing of a number of siliconcontrolled rectifiers 19, 20, 21 in an A.C. supply system comprises a transistor 41 having a primary winding 38 of a transformer 34 in its collector circuit, the transistor being non-conductive when the input signal to the base of the transistor from a signal source 52 is zero so that no pulses are developed in the secondary windings 31, 32, 33 of the transformer 34. When the signal from the source 52 changes to a negative value, the base of the transistor 41 becomes negative to the emitter and base current is drawn through a feed-back winding 39 on the transformer 34. As a consequence current begins to build up at a uniform rate in the collector circuit which includes the primary winding 38, the build-up being assisted by the induction between the windings 38, 39. When the emitter base conditions are such that the positive feed-back ceases the collector current falls rapidly so cutting off the transistor 41 and simultaneously inducing pulses in the secondary windings of the transformer 34. The frequency of these pulses is of the order of 2 kilocycles per second.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB689663A GB1004244A (en) | 1963-02-20 | 1963-02-20 | Electric switching means |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB689663A GB1004244A (en) | 1963-02-20 | 1963-02-20 | Electric switching means |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB1004244A true GB1004244A (en) | 1965-09-15 |
Family
ID=9822798
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB689663A Expired GB1004244A (en) | 1963-02-20 | 1963-02-20 | Electric switching means |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB1004244A (en) |
-
1963
- 1963-02-20 GB GB689663A patent/GB1004244A/en not_active Expired
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