GB591385A - An improved arrangement for protecting a thermionic valve against excessive current - Google Patents
An improved arrangement for protecting a thermionic valve against excessive currentInfo
- Publication number
- GB591385A GB591385A GB1155745A GB1155745A GB591385A GB 591385 A GB591385 A GB 591385A GB 1155745 A GB1155745 A GB 1155745A GB 1155745 A GB1155745 A GB 1155745A GB 591385 A GB591385 A GB 591385A
- Authority
- GB
- United Kingdom
- Prior art keywords
- relay
- shunt
- resistance
- protecting
- arrangement
- 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
- H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
- H01J19/00—Details of vacuum tubes of the types covered by group H01J21/00
- H01J19/82—Circuit arrangements not adapted to a particular application of the tube and not otherwise provided for
Landscapes
- Microwave Tubes (AREA)
Abstract
591,385. Valve circuits. BRITISH INSULATED CABLES, Ltd.:, QUAYLE, J.C., and JONES, P. May 7, 1945, No. 11557. [Class 40 (v)] An arrangement for protecting a thermionic valve against excess current comprises a shunted self-restoring relay in the anodecathode circuit which when operated by excessive current increases negative bias in the grid circuit and removes the shunt from the relay winding. In the Figure, an oscillator circuit for radio frequency heating, is shown as an example incorporating the arrangement. When relay RL, shunted .by resistance R2, operates from excessive anode current, the contact RLC1. opens and connects the relay coil and its shunt in series with the grid bias resistance R1, so increasing the negative grid bias. The simultaneous removal of the shunt R2 renders the relay more sensitive so that it is retained until the anode current falls below a certain small amount. Resistance R3 is a permanent shunt to adjust operating conditions for the particular relay.
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB591385A true GB591385A (en) | 1947-08-15 |
Family
ID=1709982
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB1155745A Expired GB591385A (en) | 1945-05-07 | An improved arrangement for protecting a thermionic valve against excessive current |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB591385A (en) |
-
1945
- 1945-05-07 GB GB1155745A patent/GB591385A/en not_active Expired
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