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GB616932A - Improvements in tuned circuits and inductances therefor - Google Patents

Improvements in tuned circuits and inductances therefor

Info

Publication number
GB616932A
GB616932A GB28438/46A GB2843846A GB616932A GB 616932 A GB616932 A GB 616932A GB 28438/46 A GB28438/46 A GB 28438/46A GB 2843846 A GB2843846 A GB 2843846A GB 616932 A GB616932 A GB 616932A
Authority
GB
United Kingdom
Prior art keywords
current
inductance
inductances
varied
oscillatory circuit
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
Application number
GB28438/46A
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.)
Philips Lamps Ltd
Koninklijke Philips NV
Original Assignee
Philips Lamps Ltd
Philips Gloeilampenfabrieken NV
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
Application filed by Philips Lamps Ltd, Philips Gloeilampenfabrieken NV filed Critical Philips Lamps Ltd
Publication of GB616932A publication Critical patent/GB616932A/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F1/00—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F21/00—Variable inductances or transformers of the signal type
    • H01F21/02—Variable inductances or transformers of the signal type continuously variable, e.g. variometers
    • H01F21/08—Variable inductances or transformers of the signal type continuously variable, e.g. variometers by varying the permeability of the core, e.g. by varying magnetic bias
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03C—MODULATION
    • H03C3/00—Angle modulation
    • H03C3/10—Angle modulation by means of variable impedance
    • H03C3/12—Angle modulation by means of variable impedance by means of a variable reactive element
    • H03C3/18—Angle modulation by means of variable impedance by means of a variable reactive element the element being a current-dependent inductor
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03J—TUNING RESONANT CIRCUITS; SELECTING RESONANT CIRCUITS
    • H03J3/00—Continuous tuning
    • H03J3/02—Details
    • H03J3/16—Tuning without displacement of reactive element, e.g. by varying permeability
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03J—TUNING RESONANT CIRCUITS; SELECTING RESONANT CIRCUITS
    • H03J3/00—Continuous tuning
    • H03J3/02—Details
    • H03J3/16—Tuning without displacement of reactive element, e.g. by varying permeability
    • H03J3/18—Tuning without displacement of reactive element, e.g. by varying permeability by discharge tube or semiconductor device simulating variable reactance
    • H03J3/185—Tuning without displacement of reactive element, e.g. by varying permeability by discharge tube or semiconductor device simulating variable reactance with varactors, i.e. voltage variable reactive diodes
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03J—TUNING RESONANT CIRCUITS; SELECTING RESONANT CIRCUITS
    • H03J7/00—Automatic frequency control; Automatic scanning over a band of frequencies
    • H03J7/02—Automatic frequency control
    • H03J7/04—Automatic frequency control where the frequency control is accomplished by varying the electrical characteristics of a non-mechanically adjustable element or where the nature of the frequency controlling element is not significant
    • H03J7/14—Controlling the magnetic state of inductor cores

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Inductance-Capacitance Distribution Constants And Capacitance-Resistance Oscillators (AREA)

Abstract

616,932. Inductances. PHILIPS LAMPS, Ltd. Sept. 23, 1946, No. 28438. Convention date, April 16, 1943. [Class 38 (ii)] [Also in Group XL (c)] An inductance by which is varied the natural frequency of an oscillatory circuit, for example in a radio receiver, or for frequency modulation of a carrier wave, has a ferrite core, the permeability of which is varied by magnetizing current in an auxiliary winding. The inductance L, with ferrite core K and auxiliary winding carrying premagnetizing current i, may be connected in parallel with, may constitute, or may be in series with an inductance L which with a condenser C forms the oscillatory circuit as shown in Figs. 1, 3 (not shown) and 5 (not shown) respectively. The first two arrangements have a linear frequency/premagnetization current characteristic. The windings may be in two series connected parts on two separate cores so arranged that the current in one winding is not reflected into the other, Fig. 5 (not shown). The ferrite path may be closed, Fig. 1, or open, Fig. 3 (not shown). Specification 626,946 is referred to.
GB28438/46A 1943-04-16 1946-09-23 Improvements in tuned circuits and inductances therefor Expired GB616932A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
NL616932X 1943-04-16

Publications (1)

Publication Number Publication Date
GB616932A true GB616932A (en) 1949-01-28

Family

ID=19788296

Family Applications (1)

Application Number Title Priority Date Filing Date
GB28438/46A Expired GB616932A (en) 1943-04-16 1946-09-23 Improvements in tuned circuits and inductances therefor

Country Status (3)

Country Link
FR (1) FR903364A (en)
GB (1) GB616932A (en)
NL (1) NL65135C (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE947375C (en) * 1953-01-22 1956-08-16 Teletype Corp Relay transmission circuit with transistor
DE965725C (en) * 1953-10-10 1957-06-19 Siemens Ag Changeable inductance with large variation of the inductance value
GB2146847A (en) * 1983-09-19 1985-04-24 American Telephone & Telegraph Electrical inductance device

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2659868A (en) * 1948-07-09 1953-11-17 Ericsson Telefon Ab L M Modulation by magnetic control of superconductors
DE973734C (en) * 1952-05-02 1960-05-25 Foxboro Co Amplifier for a fluid meter

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE947375C (en) * 1953-01-22 1956-08-16 Teletype Corp Relay transmission circuit with transistor
DE965725C (en) * 1953-10-10 1957-06-19 Siemens Ag Changeable inductance with large variation of the inductance value
GB2146847A (en) * 1983-09-19 1985-04-24 American Telephone & Telegraph Electrical inductance device

Also Published As

Publication number Publication date
FR903364A (en) 1945-10-01
NL65135C (en) 1900-01-01

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