US1778456A - Means for producing alternating currents - Google Patents

Means for producing alternating currents Download PDF

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Publication number
US1778456A
US1778456A US797987A US1913797987A US1778456A US 1778456 A US1778456 A US 1778456A US 797987 A US797987 A US 797987A US 1913797987 A US1913797987 A US 1913797987A US 1778456 A US1778456 A US 1778456A
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Prior art keywords
circuit
current
grid
electrodes
inductance
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Expired - Lifetime
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US797987A
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English (en)
Inventor
Langmuir Irving
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General Electric Co
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General Electric Co
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Filing date
Publication date
Priority to DENDAT314201D priority Critical patent/DE314201C/de
Priority to NL8541D priority patent/NL8541C/xx
Application filed by General Electric Co filed Critical General Electric Co
Priority to US797987A priority patent/US1778456A/en
Priority to FR507651A priority patent/FR507651A/fr
Priority to GB15344/20A priority patent/GB144647A/en
Priority to US708820A priority patent/US1778457A/en
Application granted granted Critical
Publication of US1778456A publication Critical patent/US1778456A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03B—GENERATION OF OSCILLATIONS, DIRECTLY OR BY FREQUENCY-CHANGING, BY CIRCUITS EMPLOYING ACTIVE ELEMENTS WHICH OPERATE IN A NON-SWITCHING MANNER; GENERATION OF NOISE BY SUCH CIRCUITS
    • H03B5/00—Generation of oscillations using amplifier with regenerative feedback from output to input
    • H03B5/08—Generation of oscillations using amplifier with regenerative feedback from output to input with frequency-determining element comprising lumped inductance and capacitance
    • H03B5/10—Generation of oscillations using amplifier with regenerative feedback from output to input with frequency-determining element comprising lumped inductance and capacitance active element in amplifier being vacuum tube

Definitions

  • My invention relates to the production of alternating currents of any frequency desired from any suitable source of either direct or alternating current, and more particularly to the production of high frequency currents.
  • electron discharge tube I means to imply the use of a highly exhausted envelope containing at least two electrodes one of which is provided with means for causing it to emit electrons and in which the flow of current with any voltage which may be applied is independent of any conductivity of a gas.
  • A. device of this nature when connected to a source of current operates selectively in such a manner as to allow current to flow between the electrodes in only one direction, that is, there will be a flow of negative electricity from the electron emitting electrode to the other electrode or electrodes, but no flow in the opposite direction. The flow of current in such case will be the result of what may be termed a pure electron discharge.
  • Fig. 1 shows diagrammatically one way in which my invention may be carried into effect
  • Fig. 2 shows the application of high frequency current obtained in this way for use in sending out signals in wireless telegraphy
  • Fig. 3 shows the application of a different form of electron discharge tube from that used in Fig. l
  • Fig. 4 shows a modification of the circuit connections slightly different from that shown in Fig. 1.
  • FIG. 1 represents an electron discharge tube which comprises an evacuated tube 2 in which is placed a cathode 3, an anode 4, which in some cases may be in the form of a plate, and a conducting bod 5, which is preferably in the form of a grid: interposed between the cathode and anode.
  • the cathode used is preferably in the form of a filament which may be raised to in. candescence by current from any convenient source as the battery 6. ⁇ Vhile this is the preferred method for causing the cathode to emit electrons, other methods may be used.
  • the two electrodes are connected by an oscillatory circuit containing an external source of current 7, which may be a battery as shown, or may be either a direct or alternating current generator, and an inductance 8; the circuit thus formed for convenience in description I call the plate circuit.
  • the cathode is also connected externally with the grid 5 through an inductance 9.
  • the oscillatory circuit thus formed I designate the grid circuit.
  • the two circuits are preferably coupled together by placing the inductance 8 in inductive relation to the inductance 9: -This coupling may be a very loose one or may be omitted entirely as the capacity between the electrodes and the grid 5 may electrostatically couple the two to produce a current in the grid circuit whenever there is a change in the current flowing in the plate circuit.
  • the electrostatic coupling may be increased by connecting the electrodes and grid to plates 3', 4 and 5 placed in inductive relation to each other as indicated in Fig. 4. If the grid were absent there would be a steady flow of current in the plate circuit between the electrodes. With the grid circuit connected, however, as soon as current starts to fiow in the plate circuit a current is induced in the grid circuit. If the inductances -8 and 9 are wound in the same direction when current in the plate circuit begins to build up current tends to flow in the opposite direction in the grid circuit and the grid becomes negatively electrified. This cuts down the flow of current in the plate circuit and as the current decreases the circuits together sufficiently circuit and grid loses its. ne ative potential and becomes positive.
  • the oscillations produced might be applied directly to the antenna of the wireless system, but in some cases it may be found desirable to amplify them.
  • the method which I have shown for their amplification consists in using a second electron discharge tube 13, similar to the first one. In the plate circuit of the second tube however, I employ as a source of current a high voltage generator 14, although a battery may be used as the source of current.
  • the oscillations produced in the coil 11, which is connected to the grid circuit of the second tube produce alternately positive and negative potentials on the grid 15.
  • FIG. 3 I have shown another form of electron discharge tube for producing oscillations which operates much more efliciently than the simple form shown in Figs. 1 and 2.
  • the tube 20 in this arrangement is provided with a cathode21 with heating means 22 and two anodes, 23 and 24.
  • the circuits shown in Fig. 1 are in this case. duplicated, one plate circuit comprising the cathode 21, the
  • the other plate circuit comprises the cathode 21, the source of power- 25, the second half of the coil 26, and the anode 23.
  • One grid circuit comprises the cathode 21, a battery 27 for impressing an extra negative potential on the grids, one-half of the coil 28 and the grid 29; the second grid circuitcomprisesthe cathode 21, the batte the second half of coil 28 and the gri 30. The operation of the two circuits is the same as that of the single circuit shown in Fig. 1.
  • An adjustable condenser 32 may be connected. in the grid circuits to vary the natural period of the circuits as in the arrangement shown in Fig. 1.
  • a conducting body in proximity to the cathode This may take the form of a grid 33 surrounding the cathode.
  • this conducting body I impress a positive potential from the battery 34.
  • I also find that in some cases the efliciency of operation of the device is greatly increased by the use of a condenser 35 in the plate circuit.
  • a source of electrical oscillating energy including an exhausted vessel containing one hot and three cold electrodes, each of said cold electrodes being located at a relatively different distance from said hot electrode, a work circuit and means to transmit the generated oscillations to said work circuit comprising circuits associated with said electrodes.
  • a source of electrcal oscillating energy including an exhausted vessel containing hot and two cold electrodes, a work circuit, and means to transmit the generated oscillations to said work circuit, and a control electrode therefor, each of said cold electrodes and said control electrode beinglocated at a relatively different distance from said hot electrode.
  • A. source of electrical oscillating energy including an exhausted vessel containing one hot and three cold electrodes, each of said cold electrodes being located at a relatively different distance from said hot electrode, the hot electrode and one cold electrode being electrically connected and the other two cold electrodes being electrically connected together, a work circuit, and means to transmit and cold electrodes, and a control electrode therefor, each of said cold electrodes being located at a relativel difl'erent distance from said hot electrode, 't e hot electrode and one cold electrode being connected together and the other cold electrode and said control electrode being connected together, a work cir-,
  • a source of electrical oscillating energy including an exhaustedvessel containin a hot and two cold electrodes, a control e cotrode interposed between said cold electrodes, each of said cold electrodes and said control electrode being located at a relatively different distance from said hot electrode a work circuit, and means for transmitting t e generated oscillations to said work circuit comprising circuits associated with all of said electrodes.
  • an oscillating system comprising an inductance having two points therein connected to the two grids, a second inductance coupled to the first and having two points therein connected to the two anodes, and a capacity in shunt to each of said inductances.
  • an oscillating system comprising an inductance having two points therein connected to the two grids and a second inductance coupled to the first and havin two points therein connected to thetwo ano es.
  • the combination in a system for producing oscillations, of an evacuated vessel containing an electron emitting cathode, two separate anodes and two separate grids, and an oscillating system comprising an inductance having two points therein connected to the two grids, a second inductance coupled to the first and having two points therein connected to the two anodes, and a capacity in shunt to each of said inductances.
  • an oscillating system comprising an inductance having two points therein connected to the two grids, a second inductance coupled to the first and having two points thereln connected to the two anodes, and connections from the cathode to a third point in each of said inductances.

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  • Inductance-Capacitance Distribution Constants And Capacitance-Resistance Oscillators (AREA)
  • Primary Cells (AREA)
  • Electron Sources, Ion Sources (AREA)
US797987A 1913-10-29 1913-10-29 Means for producing alternating currents Expired - Lifetime US1778456A (en)

Priority Applications (6)

Application Number Priority Date Filing Date Title
DENDAT314201D DE314201C (enrdf_load_stackoverflow) 1913-10-29
NL8541D NL8541C (enrdf_load_stackoverflow) 1913-10-29
US797987A US1778456A (en) 1913-10-29 1913-10-29 Means for producing alternating currents
FR507651A FR507651A (fr) 1913-10-29 1919-12-23 Perfectionnements aux modes et appareils de production des courants alternatifs
GB15344/20A GB144647A (en) 1913-10-29 1920-06-07 Improvements in and relating to the generation of alternating currents
US708820A US1778457A (en) 1913-10-29 1924-04-24 Alternating-current generation

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US797987A US1778456A (en) 1913-10-29 1913-10-29 Means for producing alternating currents

Publications (1)

Publication Number Publication Date
US1778456A true US1778456A (en) 1930-10-14

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Family Applications (1)

Application Number Title Priority Date Filing Date
US797987A Expired - Lifetime US1778456A (en) 1913-10-29 1913-10-29 Means for producing alternating currents

Country Status (5)

Country Link
US (1) US1778456A (enrdf_load_stackoverflow)
DE (1) DE314201C (enrdf_load_stackoverflow)
FR (1) FR507651A (enrdf_load_stackoverflow)
GB (1) GB144647A (enrdf_load_stackoverflow)
NL (1) NL8541C (enrdf_load_stackoverflow)

Also Published As

Publication number Publication date
FR507651A (fr) 1920-09-21
NL8541C (enrdf_load_stackoverflow)
DE314201C (enrdf_load_stackoverflow)
GB144647A (en) 1921-03-10

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