US2498257A - Device for generating high-frequency electrical oscillations - Google Patents

Device for generating high-frequency electrical oscillations Download PDF

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Publication number
US2498257A
US2498257A US2737A US273748A US2498257A US 2498257 A US2498257 A US 2498257A US 2737 A US2737 A US 2737A US 273748 A US273748 A US 273748A US 2498257 A US2498257 A US 2498257A
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US
United States
Prior art keywords
control
voltage
circuit
ignition
tube
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
US2737A
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English (en)
Inventor
Douma Tjiske
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.)
Hartford National Bank and Trust Co
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Hartford National Bank and Trust Co
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Application filed by Hartford National Bank and Trust Co filed Critical Hartford National Bank and Trust Co
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    • 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
    • H02M1/00—Details of apparatus for conversion
    • H02M1/02—Circuits specially adapted for the generation of grid-control or igniter-control voltages for discharge tubes incorporated in static converters
    • 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
    • H03B7/00—Generation of oscillations using active element having a negative resistance between two of its electrodes
    • H03B7/02—Generation of oscillations using active element having a negative resistance between two of its electrodes with frequency-determining element comprising lumped inductance and capacitance
    • H03B7/10—Generation of oscillations using active element having a negative resistance between two of its electrodes with frequency-determining element comprising lumped inductance and capacitance active element being gas-discharge or arc-discharge tube

Definitions

  • devices adapted to excite an oscillatory circuit comprising one or more controllable gas-discharge tubes, preferably gas-discharge tubes provided with an ignition electrode, which tubes are periodically ignited by, preferably impulse-shaped, ignition voltages.
  • each ignition results in the production of a damped wave-train in the oscillatory circuit included in the output circuit.
  • a control-voltage varying with these variations is used for the control of the ignition frequency.
  • the initial amplitude of this wave-train will depend upon the value of the voltage remained behind in the output circuit at the instant of ignition of the preceding wave-train, or in other words also in this case there exists a definite functional relation between the ignition frequency and the high-frequency energy dissipated in the output circuit. Even then variations in the ignition frequency or in the frequency of the high-frequency oscillations produced thus exert a great influence on the output energy.
  • control-voltage which varies with the output
  • use may be made, for example, of a coil arranged in the field of the output circuit of the said device.
  • This control-voltage may likewise be taken from a resistance included in the supply circuit of the gas-discharge tube.
  • a smoothing filter is provided in the control-voltage conductor.
  • the periodic ignition voltages are taken from a relaxation generator provided with a grid-controlled electron tube to the control-grid of which the control-voltage is supplied to control the ignition frequency.
  • the generator consists of a gas-discharge tube I, which comprises a mercury cathode and the output circuit of which includes an oscillatory circuit 2, 3, which is connected through a coil 4 to the anode of the tube.
  • the cathode of the tube is constituted by an amount of mercury 5, with which an ignition electrode 6 co-operates.
  • the ignition may be elfected capacitatively in the known manner, in which event the electrode 6 is immersed in the mercury so as to be insulated therefrom. Spark ignition, however, is also possible.
  • the ignition electrode 6 is connected via a resistance 1 to the anode of a pentode tube 8, the anode circuit of which comprises a coil 9 tuned by its own capacity ill to the ignition frequency.
  • a condenser 12 provided with a leakage resistance l3, negative impulses originating from the periodic discharges of a condenser M through a thyratron l5.
  • the device functions as follows:
  • the condenser 14 is charged through the tube It with a current intensity which depends upon the screen-gridand control-grid voltages of this tube.
  • the condenser is discharged with the result that via the grid-condenser I2 a negative voltage impulse is applied to the control-grid ll of the pentode 8.
  • the duration of this impulse may be adjusted by giving the product of the values of the elements l2 and I3 the value desired in each individual case. This results in that the current in tube 8 is suddenly interrupted for a moment and during this moment the potential energy present in the coil 9 begins to oscillate.
  • the ignition frequency is adjusted by means of the potentiometer 48 in such manner that upon increase of this frequency the voltage across the circuit 2, 3 also increases at the moments when the tube l is ignited. This is necessarily accompanied by an increase of the direct current taken from the source of supply, said current flowing inter alia through the resistance 20.
  • the voltage across this resistance is applied, via a smoothing filter of negative sign, to the control-grid l9 so that the condenser i4 is charged more slowly and the ignition frequency decreases.
  • the current in the resistance and therefore the input and consequently also the output are thus automatically maintained constant with certain limits.
  • Potentiometer 88 50,000 ohms Condenser l4: 50,000 pFs. Condenser I2: 5600 pFs.
  • Apparatus for producing oscillations of high frequency comprising a shock excited oscil- 3131101? including a gaseous discharge device having an ignition electrode and an oscillator circuit connected in series with said device, a controllable impulse generator yielding periodic pulses, the output of said generator being applied to said ignition electrode to fire periodically said device thereby to excite said oscillatory circuit, means for deriving a control voltage from said oscillator varying in accordance with the output-thereof, and means to apply said control voltage to said generator to control the periodicity thereof and thereby counter act variations in the output of said oscillator.
  • Apparatus for producing oscillations of high frequency comprising a shock excited oscillator including a gaseous discharge device having an ignition electrode and an oscillatory circuit connected in series with said device, a controllable impulse generator yielding periodic pulses, said generator including a relaxation circuit having an electron discharge tube provided with a control electrode, the output of said generator being applied to said ignition electrode to fire periodically said device thereby to excite .said oscillatory circuit, means for deriving a control-voltage from said oscillator varying in ac- COl'dEtIlCS with the output thereof, and means to apply said control voltage to said control grid to control the periodicity of said generator and thereby counteract variations in the output of said oscillator.
  • Apparatus for producing oscillations of high frequency comprising a shock excited oscillator including a gaseous discharge device having an ignition electrode, an oscillatory circuit connected in series with said device, a source of potential connected across said serially-connected oscillatory circuit and device and an impedance element interposed between said source and said device, a controllable impulse generator yielding periodic pulses, means to apply said periodic pulses to said ignition electrode to fire periodically said device and thereby excite said oscillatory circuit, means for deriving a control voltage from said impedance element varying in accordance with the output of said oscillator, and means to apply said control voltage to said generator to control the periodicity thereof accordingly thereby to counteract variations in the output of said oscillator.
  • Apparatus as set forth in claim 3, wherein said means to derive a control voltage from said impedance element includes a filter network.
  • said impulse generator comprises a charging capacitor, an electron discharge tube including a control grid and connected in series with said capacitor, a source of potential connected across said serially-connected capacitor and tube, a gaseous discharge tube, a resistance connected in series with said gaseous discharge tube across said capacitor, said control voltage derived from said impedance element being applied to said control grid whereby periodic impulses are developed across said resistance with a periodicity depending on said control voltage.
  • Apparatus for producing oscillations at high frequency comprising a shock excited oscillator including a gaseous discharge device having an ignition electrode, an oscillatory circuit connected in series with said device, a source of potential connected across said serially-connected oscillatory circuit and device, and an impedance element interposed between said source and said device, a controllable impulse generator yielding periodic pulses, said generator including a relaxation circuit having an electron discharge tube provided with a control grid, means to apply the output pulses of said generator to the said ignition electrode to fire periodically said device and thereby excite said oscillatory circuit, means including a filter network for deriving a control voltage from said impedance element varying in accordance with .the output of said oscillator, and means to apply said control voltage to said generator to control the periodicity thereof accordingly thereby to counteract variations in the output of said oscillator.

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Generation Of Surge Voltage And Current (AREA)
US2737A 1947-01-30 1948-01-16 Device for generating high-frequency electrical oscillations Expired - Lifetime US2498257A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
NL266498X 1947-01-30

Publications (1)

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US2498257A true US2498257A (en) 1950-02-21

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ID=19781750

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US2737A Expired - Lifetime US2498257A (en) 1947-01-30 1948-01-16 Device for generating high-frequency electrical oscillations

Country Status (4)

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US (1) US2498257A (en, 2012)
BE (1) BE479982A (en, 2012)
CH (1) CH266498A (en, 2012)
NL (1) NL69040C (en, 2012)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2597980A (en) * 1947-06-24 1952-05-27 English Electric Co Ltd Electric circuit comprising electric discharge device
US2869038A (en) * 1955-06-30 1959-01-13 Henry L Mccord Thyratron variable-width-pulse generator

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2103090A (en) * 1934-12-05 1937-12-21 Radio Patents Corp Means for and method of generating electrical currents
US2266516A (en) * 1938-03-30 1941-12-16 Rca Corp Saw-tooth wave generator
US2287542A (en) * 1940-11-08 1942-06-23 Clayton Mark & Company Electric induction heating
US2428926A (en) * 1943-06-04 1947-10-14 Rca Corp Modified sweep circuit for cathoderay tubes

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2103090A (en) * 1934-12-05 1937-12-21 Radio Patents Corp Means for and method of generating electrical currents
US2266516A (en) * 1938-03-30 1941-12-16 Rca Corp Saw-tooth wave generator
US2287542A (en) * 1940-11-08 1942-06-23 Clayton Mark & Company Electric induction heating
US2428926A (en) * 1943-06-04 1947-10-14 Rca Corp Modified sweep circuit for cathoderay tubes

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2597980A (en) * 1947-06-24 1952-05-27 English Electric Co Ltd Electric circuit comprising electric discharge device
US2869038A (en) * 1955-06-30 1959-01-13 Henry L Mccord Thyratron variable-width-pulse generator

Also Published As

Publication number Publication date
BE479982A (en, 2012)
NL69040C (en, 2012)
CH266498A (de) 1950-01-31

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