GB721766A - Improvements in or relating to automatic protection circuit arrangements for thermionic valves - Google Patents
Improvements in or relating to automatic protection circuit arrangements for thermionic valvesInfo
- Publication number
- GB721766A GB721766A GB4639/52A GB463952A GB721766A GB 721766 A GB721766 A GB 721766A GB 4639/52 A GB4639/52 A GB 4639/52A GB 463952 A GB463952 A GB 463952A GB 721766 A GB721766 A GB 721766A
- Authority
- GB
- United Kingdom
- Prior art keywords
- valve
- resistor
- supply
- rectifier
- series
- 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
- 239000003990 capacitor Substances 0.000 abstract 2
- 238000009499 grossing Methods 0.000 abstract 1
Classifications
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03F—AMPLIFIERS
- H03F1/00—Details of amplifiers with only discharge tubes, only semiconductor devices or only unspecified devices as amplifying elements
- H03F1/52—Circuit arrangements for protecting such amplifiers
- H03F1/54—Circuit arrangements for protecting such amplifiers with tubes only
- H03F1/548—Protection of anode or grid circuit against overload
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Fire-Detection Mechanisms (AREA)
Abstract
721,766. Valve circuits. MARCONI'S WIRELESS TELEGRAPH CO., Ltd. Oct. 10, 1952 [Feb. 21, 1952], No. 4639/52. Class 40 (6). An automatic protection circuit for a large high powered transmitter valve comprises a rectifier tube connected across the valve, a first resistance connected in series with the cathode of the valve and which on the occurrence of a flashover in the valve supplies a bias to the rectifier such to render it conducting and a condenser connected in series with a resistor across the rectifier, the resistor being connected to a device which rapidly cuts-off the H.T. supply when the voltage across the latter resistor rises. In the circuit shown, excessive current in the transmitting valve V2 causes the voltage across cathode resistor R5 to be sufficient to fire the discharge tube VI. A capacitor C1 which may be the smoothing capacitor of the H.T. supply unit discharges through the discharge tube producing sufficient voltage across a resistor R1 to cause a device associated with the supply rectifier to rapidly interrupt the H.T. supply. A small inductance L2 is preferably connected in series with the H.T. supply to the valve. The circuit will restore itself to normal when the condenser discharge ceases.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB310089X | 1952-02-21 | ||
| GB101052X | 1952-10-10 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB721766A true GB721766A (en) | 1955-01-12 |
Family
ID=26247276
Family Applications (2)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB72766D Active GB72766A (en) | 1952-02-21 | ||
| GB4639/52A Expired GB721766A (en) | 1952-02-21 | 1952-02-21 | Improvements in or relating to automatic protection circuit arrangements for thermionic valves |
Family Applications Before (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB72766D Active GB72766A (en) | 1952-02-21 |
Country Status (2)
| Country | Link |
|---|---|
| CH (1) | CH310089A (en) |
| GB (2) | GB721766A (en) |
-
0
- GB GB72766D patent/GB72766A/en active Active
-
1952
- 1952-02-21 GB GB4639/52A patent/GB721766A/en not_active Expired
- 1952-12-15 CH CH310089D patent/CH310089A/en unknown
Also Published As
| Publication number | Publication date |
|---|---|
| CH310089A (en) | 1955-09-30 |
| GB72766A (en) |
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