GB507271A - Power transfer circuit - Google Patents
Power transfer circuitInfo
- Publication number
- GB507271A GB507271A GB24481/38A GB2448138A GB507271A GB 507271 A GB507271 A GB 507271A GB 24481/38 A GB24481/38 A GB 24481/38A GB 2448138 A GB2448138 A GB 2448138A GB 507271 A GB507271 A GB 507271A
- Authority
- GB
- United Kingdom
- Prior art keywords
- amplifier
- normal
- spare
- tubes
- output
- 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
- 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
- H03F1/542—Replacing by standby devices
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Amplifiers (AREA)
- Continuous-Control Power Sources That Use Transistors (AREA)
- Emergency Alarm Devices (AREA)
Abstract
507,271. Valve circuits. STANDARD TELEPHONES & CABLES, Ltd. Aug. 19, 1938, No. 24481. Convention date, Sept. 2, 1937. [Class 40 (v)] A spare amplifier is brought into operation automatically when the output from a working amplifier becomes sub-normal, the amplifiers being changed over by removing a blocking bias from one and creating a blocking bias on the other. An alarm circuit may be completed whenthe spare amplifier is in use. Under normal conditions amplifier 5 is in use, the grid of the valve being connected through R5 to a point at earth potential on potentiometer 8 which comprises resistances R1, R2, R3 whilst the grid of the spare amplifier 5<1> is maintained at a potential of - 24 volts over resistances R4 and R6. A pair of gas discharge valves 12 connected in parallel (one valve only would suffice) have their plates connected between R1 and R2 on potentiometer 8 so that the normal voltage relative to the cathodes is 114 volts, whilst the potential of their grids is determined by rectifier bridge 13 fed from the output 3 of amplifier 5. If the output falls below a predetermined amount, the negative bias on one or both tubes 12 drops below the firing point of the tubes so that current flows in the tubes. This produces a voltage drop of about 24 volts across R4 so that the blocking bias on the spare amplifier is removed and this amplifier becomes active. At the same time the voltage at the junction of R2 and R3 is materially lowered so that a blocking bias is created on the normal amplifier 5. A relay A may be provided as shown to close an alarm circuit when the spare amplifier is in use. The return to normal output on the circuit 3 does not affect the discharge across tubes 12. The apparatus may be restored to normal when required by momentary operation of key 17. Key 18 enables the spare amplifier to be put into use when tests are to be made on the normal amplifier 5.
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US162121A US2128230A (en) | 1937-09-02 | 1937-09-02 | Power transfer circuit |
Publications (1)
Publication Number | Publication Date |
---|---|
GB507271A true GB507271A (en) | 1939-06-13 |
Family
ID=22584243
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB24481/38A Expired GB507271A (en) | 1937-09-02 | 1938-08-19 | Power transfer circuit |
Country Status (4)
Country | Link |
---|---|
US (1) | US2128230A (en) |
DE (1) | DE733695C (en) |
FR (1) | FR842889A (en) |
GB (1) | GB507271A (en) |
Families Citing this family (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2794978A (en) * | 1944-02-24 | 1957-06-04 | Bell Telephone Labor Inc | Pulse operated circuit |
NL78145C (en) * | 1949-09-20 | |||
DE946155C (en) * | 1951-02-01 | 1956-07-26 | Standard Elek K Ag | Arrangement for monitoring the carrier power supply in carrier-frequency message transmission systems |
DE966750C (en) * | 1954-02-28 | 1957-09-05 | Standard Elek K Ag | Circuit arrangement for signal current generators working in parallel |
NL205669A (en) * | 1956-03-22 | 1900-01-01 | ||
DE1025530B (en) * | 1957-01-25 | 1958-03-06 | Siemens Ag | Circuit arrangement for monitoring gas discharge tubes |
-
1937
- 1937-09-02 US US162121A patent/US2128230A/en not_active Expired - Lifetime
-
1938
- 1938-08-19 GB GB24481/38A patent/GB507271A/en not_active Expired
- 1938-09-01 FR FR842889D patent/FR842889A/en not_active Expired
- 1938-09-03 DE DEI62389D patent/DE733695C/en not_active Expired
Also Published As
Publication number | Publication date |
---|---|
FR842889A (en) | 1939-06-21 |
DE733695C (en) | 1943-04-01 |
US2128230A (en) | 1938-08-30 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
GB507271A (en) | Power transfer circuit | |
US2201345A (en) | Thermionic valve repeating arrangement | |
US2678391A (en) | Protective circuit | |
US2475050A (en) | Constant current circuit | |
US2032199A (en) | Energizing circuits for space discharge devices | |
US2300127A (en) | Protective device | |
GB426002A (en) | Improvements in and relating to the production of electric oscillations by means of grid-controlled gas-discharge tubes | |
GB529558A (en) | Improvements in and relating to electrical ignition apparatus | |
US2056912A (en) | Circuits for resetting gaseous discharge devices | |
US2174500A (en) | Electric glow valve system | |
US1958994A (en) | High frequency transmitter | |
GB283134A (en) | Improvements in or relating to electrical rectifying devices | |
GB732567A (en) | Improvements in or relating to thermionic valve amplifying circuits | |
AT110097B (en) | Circuit arrangement for modulating the vibrations generated by a thermionic device. | |
GB353672A (en) | Improvements in and relating to photo-electric cell circuits | |
US2118919A (en) | Testing arrangement for electron discharge devices and methods of operating same | |
US2277098A (en) | Electrical circuit | |
US2162535A (en) | Neutralizing circuit | |
GB380024A (en) | Improvements in thermionic amplifiers | |
GB397175A (en) | Improved coupling networks and circuits particularly applicable to thermionic amplifiers | |
US2045428A (en) | Power supply circuit | |
US2265223A (en) | Service observing set | |
US2184382A (en) | Radio and other high frequency telegraph transmitters | |
GB216783A (en) | Improvements in and relating to automatic reclosing circuit breaker systems | |
DE676336C (en) | Device for monitoring the operating condition of glow cathodes in discharge tubes |