US1874159A - Electric amplifying circuits - Google Patents

Electric amplifying circuits Download PDF

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Publication number
US1874159A
US1874159A US484627A US48462730A US1874159A US 1874159 A US1874159 A US 1874159A US 484627 A US484627 A US 484627A US 48462730 A US48462730 A US 48462730A US 1874159 A US1874159 A US 1874159A
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US
United States
Prior art keywords
electric
current
valves
signal
potential
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
US484627A
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English (en)
Inventor
Burnice D Bedford
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 BE382254D priority Critical patent/BE382254A/xx
Priority claimed from US478168A external-priority patent/US2009788A/en
Priority to US478164A priority patent/US2009833A/en
Application filed by General Electric Co filed Critical General Electric Co
Priority to US484627A priority patent/US1874159A/en
Priority to DE1930652724D priority patent/DE652724C/de
Priority to FR723098D priority patent/FR723098A/fr
Priority to GB24022/31A priority patent/GB385019A/en
Priority to GB24021/31A priority patent/GB372202A/en
Priority to GB26782/31A priority patent/GB389855A/en
Priority to FR40817D priority patent/FR40817E/fr
Publication of US1874159A publication Critical patent/US1874159A/en
Application granted granted Critical
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03F—AMPLIFIERS
    • H03F3/00—Amplifiers with only discharge tubes or only semiconductor devices as amplifying elements
    • H03F3/02—Amplifiers with only discharge tubes or only semiconductor devices as amplifying elements with tubes only
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M7/00—Conversion of AC power input into DC power output; Conversion of DC power input into AC power output
    • H02M7/42—Conversion of DC power input into AC power output without possibility of reversal
    • H02M7/44—Conversion of DC power input into AC power output without possibility of reversal by static converters
    • H02M7/48—Conversion of DC power input into AC power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
    • H02M7/505—Conversion of DC power input into AC power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a thyratron or thyristor type requiring extinguishing means
    • H02M7/51—Conversion of DC power input into AC power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a thyratron or thyristor type requiring extinguishing means using discharge tubes only
    • 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
    • H03F1/02—Modifications of amplifiers to raise the efficiency, e.g. gliding Class A stages, use of an auxiliary oscillation
    • H03F1/04—Modifications of amplifiers to raise the efficiency, e.g. gliding Class A stages, use of an auxiliary oscillation in discharge-tube amplifiers
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03F—AMPLIFIERS
    • H03F3/00—Amplifiers with only discharge tubes or only semiconductor devices as amplifying elements
    • H03F3/38—DC amplifiers with modulator at input and demodulator at output; Modulators or demodulators specially adapted for use in such amplifiers
    • H03F3/40—DC amplifiers with modulator at input and demodulator at output; Modulators or demodulators specially adapted for use in such amplifiers with tubes only

Definitions

  • My invention relates to electric circuits for amplifying electric signals and more particularly to electric circuits including controlled electric valves for accurately reproducing and amplifying electric signals.
  • I provide an electric circuit, including electric Valves, for convertin direct current to alternating current and I provide high frequency periodic potential of a particular wave form for exciting the grids of the valves.
  • This high frequency grid potential is modulated by the signal to be amplified.
  • the output of such a circuit will have a component of the same frequency as the high frequency grid excitatlon and another component of the same frequency as that of the signal to be amplified.
  • a suitable filter the high frequency component is eliminated leaving only that component having the frequency of the signal to be amplified.
  • Fig. 1 of the drawing is a diagrammatic representation of my invention as applied to an electric power converting apparatus of the type known in the art as a parallel inverter, by means of which an electric signal may be amplified;
  • Fig. 2 comprises reproductions of oscillograms of certain operating characteristics of the apparatus illustrated in Fig. 1, and Figs. 3 and 4 show certain characteristics of one feature of my invention by means of which I secure the desired excitation for the grids of the electric valves.
  • FIG. 1 of the accompanying drawing I have illustrated an electric power converting apparatus for amplifying an electric signal impressed upon the circuit 10 and delivering the amplified output to the circuit 11.
  • This power con verting apparatus derives energy from the direct current circuit 12 and includes an inductive winding 13 provided with an electrical midpoint connected to the positive direct current terminal through a smoothing reactor 14 and a resistor 15.
  • the inductive winding 13 may be a reactor or, as shown, the primary winding of a transformer 16, the secondary winding 17 of which is connected to the output circuit 11.
  • electric valves 18 and 19 Between opposite terminals of the inductive winding 13 and the negative direct current terminal 12 are connected electric valves 18 and 19.
  • valves may be of any of the several types well known in the art but I prefer to use vapor electric discharge valves provided with an anode, a cathode and a control grid.
  • a capacitor 20 is connected between the circuits of the electric valves 18 and 19 for commutating the current between them.
  • the grid circuits of the electric valves18 and 19 include opposite halves of the secondary winding of a grid transformer 22.
  • the primary winding 23 of the transformer 22 includes the electric signal'to be amplified, which may be derived from the circuit 10 by means of a transformer 2e, and a source of relatively.
  • the average current-over a complete cycle maybe Varied from approximately zero to maximum in either direction.
  • Curve II of Fig-211 a reproduction of an oscillogram of the current output of one of-the electric valves, for example, valve 18.
  • the output curve of the valve 19 will be similar but displaced by 180 in'time phase and having an opposite polarity with respect to the load circuit'11
  • the resultant'output current will be an alternating current of a frequency the sameas that of the high frequency grid exciting potential, but in which the positive and positive potential applied to theelectric valve negative half cycles are of unequal value.
  • Such a wave is substantially the equivalent of a symmetrical wave plus a direct current component of a polarity dependent upon whether the positive or negative half cycle is the larger.
  • This direct current component reverses its polarity at a frequency equal to that of the signal to be amplified and, by filtering out the high frequency component, the resultant output of the apparatus will be a periodic current of a frequency and wave form similar to that of the electric signal to be amplified.
  • Curve III of Fig. 2 is a reproduction of an oscillogram of the amplifier output with a cycle electric signal and approximately a 1.000 cycle grid exciting potential. It will be obvious to those skilled in the art that the accuracy with which the electric signals may be reproduced increases with an increase in frequency of the grid exciting potential.
  • I have provided a filter circuit comprising the series connected reactors 32 and 33 and the parallel capacitors 35 and 36 for filtering out the high frequency component of the output current.
  • Curve VIII of Fig. 4 represents the grid potential of the valve 29.
  • the anode current of electric valve 29 is caused to flow through the capacitor 25 either by connecting it directly in series in the anode circuit or by inserting a series transformer 31 in order to step up the voltage applied to the capacitor 25.
  • the potential across the capacitor 25 is represented byCurve IX of 4:, which, it is seen, is substantially triangular. The approximation of this curve to an exactly triangular wave is directly proportional to the approximation of the anode current to a rectangular wave which may be made very close by applying a very large grid potential to the electric valve 29. 7
  • Apparatus for amplifying an electric signal comprising a source of direct current and a load circuit, an interconnection between said source and said circuit including an inductive winding and an electric valve, means independent of the signal for periodically rendering said valve conducting, and means responsive to the signal to be amplified for determining the interval during which the valve remains conducting.
  • Apparatus for amplifying an electric signal comprising a source of direct current, a load circuit, an interconnection between said source and said circuit including an inductive winding and a pair of electric valves, means independent of the signal for periodically and alternately rendering said valves conducting, and means responsive to the signal to be amplified for determining the periods during which the valves remain conducting.
  • a load circuit an interconnection between said source and said circuit including anoinductive winding and a pair of electric valves, means for alternately initiating :a flow of current in'said valves, means responsive to the fiow'of current in one of said valves for interrupting the current in the other, and means responsive to the signal to be amplified for determining the time intervals between' the starting of current insuccessive valves.
  • Apparatus for. ampllfylng an electrlc signal comprising a source of. direct current
  • a load circuit an interconnection between said source and said circuit including an inductive winding and a pair of electric valves, means for alternately initiating a current in said-valves, means responsive to the starting' of current in one of said valves for interrupting the current in the other, and me ans responsive to the instantaneous value of the signal to be amplified for determining the difference in the time intervals between the starting of current in-the successive valves.
  • Apparatus for amplifying an electric signal comprising a source of direct current, a load circuit, an interconnection between said source and said circuit including an inductive winding and a pair of electric valves, means for alternately starting a, current in said valves, means responsive to. the startingof current in one of said valves for interrupting the current in the other, andmeans for causing the difference in the time intervals beeach provided with a control element, means for energizing said control elements with a perlodic potential of a frequency relatively high with respect to that of the signal and of an amplitude less-than that of the signal,
  • a load circuit an interconnection between sa1d source and said circuit including an inductive winding and apa r of electric valves,
  • Apparatus for amplifying an electricsignal comprising a source of direct current, a load circuit,- an interconnection between said source and said circuit comprising an inductive winding,the electrical midpoint of V which is connected to one direct current terminal, a pairofelectric valves, provided with 7 control grids connected between opposite terminals ofsaid inductive winding and the other direct current terminal, and a capacitor connected between the circuits of said valves for commutatingthe current between them, a grid transformer, grid circuits for each of said valves includin opposite halves of the secondary winding of said transformer, an energizing circuit for the primary winding of said transformer including said electric signal and a source of alternating potential of substantially triangular wave form, of a frequency relatively high with respect to that of said signal and of lesser amplitude,and means connected in said outputcircuit for filtering substantially all frequencies except those of the signal.
  • the method of amplifying an electric signal which comprises generating a periodic potential of substantially triangular wave formand of a relatively high frequency with respect to that of the signal and'of a lesser amplitude,combiningthe signal with the high frequencypotential, controlling the average value of a periodic current in accordance with the diiference in thetime intervals of successive positive and negative half cycles of said combined potential wave with respect to a fixed potential, and filtering from said periodic current substantially all frequencies except thoseincluded in the signal to be amplified.

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Surface Acoustic Wave Elements And Circuit Networks Thereof (AREA)
  • Amplifiers (AREA)
  • Inverter Devices (AREA)
  • Magnetic Resonance Imaging Apparatus (AREA)
  • Dc-Dc Converters (AREA)
US484627A 1930-08-27 1930-09-26 Electric amplifying circuits Expired - Lifetime US1874159A (en)

Priority Applications (9)

Application Number Priority Date Filing Date Title
BE382254D BE382254A (en(2012)) 1930-08-27
US478164A US2009833A (en) 1930-08-27 1930-08-27 Electric power converting apparatus
US484627A US1874159A (en) 1930-08-27 1930-09-26 Electric amplifying circuits
DE1930652724D DE652724C (de) 1930-08-27 1930-12-17 Anordnung zur Verbesserung der Kommutierungsverhaeltnisse bei mit gittergesteuerten Dampf- oder Gasentladungsstrecken arbeitenden Wechselrichtern in Parallelanordnung
FR723098D FR723098A (fr) 1930-08-27 1931-08-24 Perfectionnements aux convertisseurs thermioniques
GB24022/31A GB385019A (en) 1930-08-27 1931-08-26 Improvements in and relating to electric power converting apparatus
GB24021/31A GB372202A (en) 1930-08-27 1931-08-26 Improvements in and relating to electric power converting apparatus
GB26782/31A GB389855A (en) 1930-08-27 1931-09-25 Improvements in and relating to electric amplifying circuits
FR40817D FR40817E (fr) 1930-08-27 1931-09-25 Perfectionnements aux convertisseurs thermoioniques

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US478168A US2009788A (en) 1930-08-27 1930-08-27 Electric power converting apparatus
US484627A US1874159A (en) 1930-08-27 1930-09-26 Electric amplifying circuits

Publications (1)

Publication Number Publication Date
US1874159A true US1874159A (en) 1932-08-30

Family

ID=27045809

Family Applications (1)

Application Number Title Priority Date Filing Date
US484627A Expired - Lifetime US1874159A (en) 1930-08-27 1930-09-26 Electric amplifying circuits

Country Status (5)

Country Link
US (1) US1874159A (en(2012))
BE (1) BE382254A (en(2012))
DE (1) DE652724C (en(2012))
FR (2) FR723098A (en(2012))
GB (3) GB372202A (en(2012))

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5249201A (en) * 1991-02-01 1993-09-28 Mst, Inc. Transmission of multiple carrier signals in a nonlinear system

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2441963A (en) * 1940-02-03 1948-05-25 Int Standard Electric Corp Electric impulse signaling system

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5249201A (en) * 1991-02-01 1993-09-28 Mst, Inc. Transmission of multiple carrier signals in a nonlinear system

Also Published As

Publication number Publication date
GB372202A (en) 1932-05-05
BE382254A (en(2012))
DE652724C (de) 1937-11-06
FR723098A (fr) 1932-04-02
GB389855A (en) 1933-03-27
GB385019A (en) 1932-12-22
FR40817E (fr) 1932-09-07

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