US1634970A - Method of and means for controlling alternating currents - Google Patents

Method of and means for controlling alternating currents Download PDF

Info

Publication number
US1634970A
US1634970A US715723A US71572324A US1634970A US 1634970 A US1634970 A US 1634970A US 715723 A US715723 A US 715723A US 71572324 A US71572324 A US 71572324A US 1634970 A US1634970 A US 1634970A
Authority
US
United States
Prior art keywords
current
circuit
coils
antenna
controlling
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
US715723A
Other languages
English (en)
Inventor
Ernst F W Alexanderson
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 NL12723D priority Critical patent/NL12723C/xx
Priority to DENDAT308202D priority patent/DE308202C/de
Priority to FR520938A priority patent/FR520938A/fr
Application filed by General Electric Co filed Critical General Electric Co
Priority to US715723A priority patent/US1634970A/en
Application granted granted Critical
Publication of US1634970A publication Critical patent/US1634970A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Images

Classifications

    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03C—MODULATION
    • H03C1/00—Amplitude modulation
    • H03C1/08—Amplitude modulation by means of variable impedance element
    • H03C1/10—Amplitude modulation by means of variable impedance element the element being a current-dependent inductor

Definitions

  • My present invention relates to improve ments in apparatus for controlling alternating electric currents, and more especlally for controlling alternating currents used in wireless signaling systems.
  • My present application is a division of my prior appl1cation Serial No. 873,110, filed November 20, 1914, now Patent No. 1,522,221.
  • the object of my invention 1s to provide a suitable organization whereby the amplitude oflalternating current flowing in a c1r-- cuit or the output of an alternating current generator of comparatively large capac ty may be varied between wide limits by variations in a controlling current of comparatively small magnitude.
  • a further object of my invention is to provide a transmitting system for wireless telephony wherein large amounts of energy may be controlled by the small current variations produced by sound waves m an ordinary telephone transmitter, in such a way that the sound waves may be faithfully reproduced in suitable receiving apparatus at a distant point.
  • the utility of myunvention is by no means limited to wireless telephony as it may equally well be employed in transmitting telephone currents through wires.
  • the source I of high frequency alternating current 1 is inductively connected by means of the transformer 2 with the antenna 3.
  • the amount of current flowing in the antenna is controlled by varying the inductance of the antenna circuit by variations in a controlling current flowing in a second circuit.
  • a reactance comprising the two -'-coi1s 4 and 5 Wound around a magnetic core 6 is connected in shunt to t a secondary of transformer 2. Wound upo; the same core are twoicoils 7 and 8 through which the con- No. 873,110, Patent No. 1,522,221. Divided and this 1924.
  • the coils 7 and 8 are connected in opposition to each other, hence, the magnetizing action of the current flowing in coil 7 upon coil 5 is opposite in effect to that of the current flowing in coil 8 upon coil 4. Furthermore, as coils 'Z and 8 are connected in opposition, the voltage i nduced in coil 7 by the high frequency current is opposite to that induced in coil 8.
  • the respective coils areso designed that the voltage induced in coil 7 is equal to that induced in col] 8 and therefore the effect of these voltages is neutralized.
  • the com bined inductance of coils 4 and 5 will vary as a function of the variations in the magnetization of the core 6, this change in inductance beingdue to the varying magnetic reluctance at varying magnetic densities ⁇ Since the coils 7 and 8 are connected in opposition, the combined inductance of coils 4' I and 5 in the shunt circuit will be uniform for the two alternations of a complete cycle of the current. ,It will thus be evident that the current flowing-in the antenna can be controlled by varying the amount of current supplied to the coils 7 and 8.
  • the amplitudeof the antenna current will fall below normal value as the natural period of the antenna increases.
  • the controlling current is decreased, the inductance of the two coils will increase and the antenna potential and current will increase. Since, however, the lnductive losses are much less than when the controlling current is increaslng, the maximum amplitude of the current will becomegreater than under normal conditions.
  • the variation 1n the antenna current which may be produced with a given variation of the controlling current will be much greater than when the coils are connected in series with the antenna.
  • the controlling current for the coils 7 and 8 may be supplied by any convenient source of direct current which can be varied so as to vary the antenna current in a desired manner.
  • I have indicated a means for securing the controlling current which is especially adapted for use in cases .where an ordinary source of the required voltage and output is not available.
  • the circuit of the magnetizing coils 7 and 8 includes an inductance' 9 which may be loosely coupledto the tuning inductance 10 in the antenna.
  • the current derived in this way is rectified by means of the mercury rectifier 11 and caused to flow through the transmitter 12 1 and coils 7 and 8.
  • the transmitter 152 instead of being connected directly in the circuit may be included in aseparate circuit inductively related to the control circuit.
  • the direct current source of energy 13 which is connected to the coils 7 and 8 through the inductance 14 produces a constant magnetization of the core 6.
  • This battery is connected in such a way as to oppose the clectromotive force dcrived from the coil 9 and the rectifier 1].
  • the impedance of that part of the antenna circuit including the coils 4: and 5 may be the minimum when the controlling current in the coils 7 and 8 is a maximum. it will be found desirable to includein the circuit an adjustable condenser 15.
  • the method of producing telephone currents which consists in applying to a telephone transmitter from a circuit external to that in which the transmitter is connected an electromotive force which varies as an inverse function of the variations in the resistance of the transmitter.

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Mobile Radio Communication Systems (AREA)
  • Transmitters (AREA)
US715723A 1914-11-20 1924-05-24 Method of and means for controlling alternating currents Expired - Lifetime US1634970A (en)

Priority Applications (4)

Application Number Priority Date Filing Date Title
NL12723D NL12723C (enrdf_load_stackoverflow) 1914-11-20
DENDAT308202D DE308202C (enrdf_load_stackoverflow) 1914-11-20
FR520938A FR520938A (fr) 1914-11-20 1920-07-22 Perfectionnements aux modes et appareils de commande des courants alternatifs
US715723A US1634970A (en) 1914-11-20 1924-05-24 Method of and means for controlling alternating currents

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US87311014A 1914-11-20 1914-11-20
US715723A US1634970A (en) 1914-11-20 1924-05-24 Method of and means for controlling alternating currents

Publications (1)

Publication Number Publication Date
US1634970A true US1634970A (en) 1927-07-05

Family

ID=27109412

Family Applications (1)

Application Number Title Priority Date Filing Date
US715723A Expired - Lifetime US1634970A (en) 1914-11-20 1924-05-24 Method of and means for controlling alternating currents

Country Status (4)

Country Link
US (1) US1634970A (enrdf_load_stackoverflow)
DE (1) DE308202C (enrdf_load_stackoverflow)
FR (1) FR520938A (enrdf_load_stackoverflow)
NL (1) NL12723C (enrdf_load_stackoverflow)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE973734C (de) * 1952-05-02 1960-05-25 Foxboro Co Verstaerker fuer einen Fluessigkeitsmesser

Also Published As

Publication number Publication date
NL12723C (enrdf_load_stackoverflow) 1900-01-01
FR520938A (fr) 1921-07-04
DE308202C (enrdf_load_stackoverflow)

Similar Documents

Publication Publication Date Title
US1596558A (en) Method and apparatus for amplifying electric currents
US1634970A (en) Method of and means for controlling alternating currents
US1426123A (en) Motor-control system
US2338079A (en) Inverter circuit
US1356763A (en) Oscillation-generator
US1694637A (en) Speed regulator
US1206643A (en) Controlling alternating currents.
US1328797A (en) Means for controlling alternating currents
US1522221A (en) Method of and means for controlling alternating currents
US1301279A (en) Method of and means for controlling electrical energy.
US1328610A (en) Method of and means for controlling high-frequency alternating currents
US3290579A (en) Multi-phase a. c. to d. c. converter with output control means
US3460020A (en) Phase-controlled voltage regulator
US1296269A (en) Generating system.
US1181556A (en) Means for producing high-frequency currents.
US1843525A (en) Feeding arrangement for electric devices
US2483151A (en) Dynamoelectric machine
US1012524A (en) Apparatus for automatic regulation of rectifiers and rotary converters.
US808438A (en) Telephony.
US1546639A (en) Method of and apparatus for the reception of radiosignals
US1808579A (en) Generation of electric currents
US1816717A (en) Electrical distribution system
US2260930A (en) Constant frequency power supply system
US1207388A (en) Method and apparatus for submarine signaling.
SU42A1 (ru) Устройство дл усилени микрофонного тока с применением самоиндукции