US1585450A - Protective apparatus - Google Patents

Protective apparatus Download PDF

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Publication number
US1585450A
US1585450A US30029A US3002925A US1585450A US 1585450 A US1585450 A US 1585450A US 30029 A US30029 A US 30029A US 3002925 A US3002925 A US 3002925A US 1585450 A US1585450 A US 1585450A
Authority
US
United States
Prior art keywords
resistance
current
filament
value
supplied
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 - Lifetime
Application number
US30029A
Other languages
English (en)
Inventor
Dow O Whelan
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
General Electric Co
Original Assignee
General Electric Co
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Priority to NL18060D priority Critical patent/NL18060C/xx
Application filed by General Electric Co filed Critical General Electric Co
Priority to US30029A priority patent/US1585450A/en
Priority to DEI26664D priority patent/DE475134C/de
Priority to GB12278/26A priority patent/GB252181A/en
Application granted granted Critical
Publication of US1585450A publication Critical patent/US1585450A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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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
    • H03F1/544—Protection of filaments

Definitions

  • My present invention relates to protective apparatus especially adapted for use in therinionic amplifier systems.
  • D 'Ihe object of my invention is to provide an apparatus for protecting the amplifying apparatus from both of these dangers.
  • a resistance which varies 1n ⁇ a critical manner with variations in its temperature.
  • Such a resistance may be con- .veniently of the form of a tungsten ilament .enclosed in an atmosphere of hydrogen or other inert gas.
  • the resistance of this lilaF ment at the normaloperating temperature may be comparatively low, but if the current passing through it tends to increase above a certain critical value the resistance will increase very greatly and thus limit the cu r rent to some predetermined value which will not damage the apparatus,at the saine time give a visible indication of the short-circuit condition.
  • 4 represen-ts'another 45 volt battery, which' t, may be connected in series with 2 and 3 for supplying 135 volts to a higher power amplifier' tube; 5 represents a C battery which may be provided with taps as indicated, for furnishing grid bias to the diferent tubes.
  • the protective device 6 has a filament 7, enclosed in an evacuated bulb 8, containing 'a filliiig'oiA hydrogen or other nonoXidizing gas.
  • Filament 7 has one terminal connected to the positive terminal of battery 2 and the other terminal to the negative terminal of battery 3 so that the operating current supplied to the amplifier tubesoperating at 90 and 135 volts is required to ow throu hv the entire length of the lament.
  • the ament is ta pecl at an 'intermediatepoint 9- aud from t is tap voltage. may be supplied to the detector tubegs, so that the current to' minal is not shown.
  • the whole device may l be constructed in a manner similar to that employed for automobile lamps.
  • the intermediate tap 9 tothe vfilament 7V is also connected to a leading-in conductor extending through the 'stem 1Q, and this leading-in conductor is connected at 13 to the shell 121'- Contact may be made to the.v
  • a similar protective lamp may ⁇ 'be employedat the 'unction between batteries 1 and 2, a portion of the filament being connectedto supply and regulate current to the filaments of the tubes while the en- Atire filament is connected -in series with the B battery.
  • Other modifications of the manner of using the protective device as well as in the precise form of device employed may be.made Without departing from the scope of my invention as set forth in the appended claims.
  • a protective device for an amplifying system having a plurality of thermionic discharge devices and sources of potential of different 'value for different devices, com-v prising a resistance which varies in value in a critical -manner with thel current ⁇ flowing therein, said resistance being so connected .to the system that the operating 'current'supplied from a source of lower potential is required to iow through a portlon only of the resistance, and the operating current supplied from 'a source of higherpotential is re- 'with the current flowing therein, said resistance having one terminal connected to the positive terminal of one of said sources, and
  • a protective device for an amplifying' system having a plurality' of thermionic discharge devices and sources of potential of different value for supplying di'erent circuits comprising a 'resistance which varies in value in a critical manner withl the current owing therein, said resistance being so connected to the system that the operating current supplied'from one of said sources is required to iiow through a portion only of the resistance and the operating current supplied from another source is required to How through the entire resistanceI ⁇ r1 4.
  • a protective device for an amplifying system having a plurality of thermionic dischargedevices and a plurality of sources of potential for supplying different circuits comprising a resistance which varies in value in a critical manner with the current iowing therein, said resistance having one terminal connected to the positive terminal of one of said sources and its othervterminal connected to the negative terminal of ansusl other of said sources, and a connection to an intermediate point of said resistance for supplying operating current to one of the circuits of said system.
  • a protective device of an amplifying system having a plurality of sources'of potential for supplying different circuits comprising a resistanceso connected to the system that the operating current supplied to one circuit is required to flow through a portion only of the resistance and the operating current supplied to another circuit is re- -quired to flow through theentire resistance
  • said resistance' having a comparatively low value when the normal o erating current tiows therethrough, buthavmg the property of increasing greatlyA in value 'when the current iiowingV therethrough jappreciably exceeds .the ⁇ normalfcur'rent.
  • a protective device for an electrical network comprising a plurality of circuits to which dierent potentials are supplied com'- prising a resistance so connected to thel system that the' operating current supplied to one circuit is required to flow through a portion only of the resistance when the operating current supplied to anothercircuit is required to flow through the entire resistance,
  • said resistance having a comparatively low 'value when the normal -operating current 'flows therethrough and having the'property of increasing greatly in value ,when the eur- I rent flowing therethrough appreciably Aexceeds the normal current.
  • a protective device for an electrical network having a plurality of circuits adapted to be supplied by different potentials comprising a resistance which varies in value in a critical manner with the current flowing thereinLsaid resistance being so connected to the system that the operating current supplied froln a source of lower potential is required to flow through a portion only of the resistance and the operating current supplied from a source of higher potential is required to How through the entire resistance.

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Amplifiers (AREA)
  • Emergency Protection Circuit Devices (AREA)
  • Battery Mounting, Suspending (AREA)
US30029A 1925-05-13 1925-05-13 Protective apparatus Expired - Lifetime US1585450A (en)

Priority Applications (4)

Application Number Priority Date Filing Date Title
NL18060D NL18060C (enrdf_load_stackoverflow) 1925-05-13
US30029A US1585450A (en) 1925-05-13 1925-05-13 Protective apparatus
DEI26664D DE475134C (de) 1925-05-13 1925-09-15 Stark temperaturempfindlicher Schutzwiderstand fuer Gluehkathodenroehren von drahtlosen Empfaengern mit mehreren Roehren und Spannungen
GB12278/26A GB252181A (en) 1925-05-13 1926-05-12 Improvements in protective devices, particularly intended for thermionic valve apparatus

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US30029A US1585450A (en) 1925-05-13 1925-05-13 Protective apparatus

Publications (1)

Publication Number Publication Date
US1585450A true US1585450A (en) 1926-05-18

Family

ID=21852160

Family Applications (1)

Application Number Title Priority Date Filing Date
US30029A Expired - Lifetime US1585450A (en) 1925-05-13 1925-05-13 Protective apparatus

Country Status (4)

Country Link
US (1) US1585450A (enrdf_load_stackoverflow)
DE (1) DE475134C (enrdf_load_stackoverflow)
GB (1) GB252181A (enrdf_load_stackoverflow)
NL (1) NL18060C (enrdf_load_stackoverflow)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3101453A (en) * 1957-01-21 1963-08-20 Modern Telephones Great Britai Transistor amplifiers with protective circuit means
US3263172A (en) * 1963-06-20 1966-07-26 Motorola Inc Transistor transmitter output amplifier protection means

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE966205C (de) * 1944-07-22 1957-07-25 Siemens Ag Einrichtung zur Regelung von Hochfrequenzgeneratoren
US3165571A (en) * 1961-06-20 1965-01-12 Westinghouse Electric Corp Automatic current regulator

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3101453A (en) * 1957-01-21 1963-08-20 Modern Telephones Great Britai Transistor amplifiers with protective circuit means
US3263172A (en) * 1963-06-20 1966-07-26 Motorola Inc Transistor transmitter output amplifier protection means

Also Published As

Publication number Publication date
NL18060C (enrdf_load_stackoverflow)
DE475134C (de) 1929-04-19
GB252181A (en) 1927-06-16

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