GB1196061A - Improvements in or relating to the Operation of Electro-Magnetic Coils. - Google Patents
Improvements in or relating to the Operation of Electro-Magnetic Coils.Info
- Publication number
- GB1196061A GB1196061A GB704868A GB704868A GB1196061A GB 1196061 A GB1196061 A GB 1196061A GB 704868 A GB704868 A GB 704868A GB 704868 A GB704868 A GB 704868A GB 1196061 A GB1196061 A GB 1196061A
- Authority
- GB
- United Kingdom
- Prior art keywords
- circuit
- thyristor
- generator
- frequency
- capacitor
- 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
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F7/00—Magnets
- H01F7/06—Electromagnets; Actuators including electromagnets
- H01F7/08—Electromagnets; Actuators including electromagnets with armatures
- H01F7/18—Circuit arrangements for obtaining desired operating characteristics, e.g. for slow operation, for sequential energisation of windings, for high-speed energisation of windings
Landscapes
- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Control Of Electrical Variables (AREA)
Abstract
1,196,061. Control systems for inductive loads. DAVIES & METCALFE Ltd. 9 May, 1969 [13 Feb., 1968], No. 7048/68. Heading H2H. [Also in Division H3] A circuit for energizing an inductive load 5 comprises a capacitor 6 in shunt with the load so as to form a circuit having a natural resonant frequency of say, 1000 Hz, a thyristor 8 connected in series with the circuit 5, 6 across a supply P and a pulse generator 9 connected to the gate of the thyristor 8, the output frequency of the generator being variable between 50 and 1000 Hz. Each pulse from the generator 9 turns on the thyristor 8 which is then turned off by the resonant action of the circuit 5, 6, the duration of each conductive period being determined by the resonant frequency of the circuit 5, 6. Thus the average current flowing in the coil 5 is determined by the frequency of the pulses from the generator 9. The diode 10 prevents peak inverse voltages being developed across the thyristor and a capacitor 11 suppresses spurious operation of the thyristor. If desired the voltage across the circuit 5, 6, 8 may be stabilized by a Zener diode.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB704868A GB1196061A (en) | 1968-02-13 | 1968-02-13 | Improvements in or relating to the Operation of Electro-Magnetic Coils. |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB704868A GB1196061A (en) | 1968-02-13 | 1968-02-13 | Improvements in or relating to the Operation of Electro-Magnetic Coils. |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB1196061A true GB1196061A (en) | 1970-06-24 |
Family
ID=9825644
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB704868A Expired GB1196061A (en) | 1968-02-13 | 1968-02-13 | Improvements in or relating to the Operation of Electro-Magnetic Coils. |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB1196061A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2140986A (en) * | 1983-04-13 | 1984-12-05 | Michael Shmuel Howard | Switching of cyclic and general d.c. devices by a self-commutating- avalanche-device or interval-timer circuit |
| EP0287975A2 (en) * | 1987-04-21 | 1988-10-26 | Siemens Aktiengesellschaft | Circuit arrangement with an electromagnetically controlled fault current switch device |
-
1968
- 1968-02-13 GB GB704868A patent/GB1196061A/en not_active Expired
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2140986A (en) * | 1983-04-13 | 1984-12-05 | Michael Shmuel Howard | Switching of cyclic and general d.c. devices by a self-commutating- avalanche-device or interval-timer circuit |
| EP0287975A2 (en) * | 1987-04-21 | 1988-10-26 | Siemens Aktiengesellschaft | Circuit arrangement with an electromagnetically controlled fault current switch device |
| EP0287975A3 (en) * | 1987-04-21 | 1990-06-13 | Siemens Aktiengesellschaft | Circuit arrangement with an electromagnetically controlled fault current switch device |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PS | Patent sealed | ||
| PCNP | Patent ceased through non-payment of renewal fee |