US2416718A - Pulse generator - Google Patents

Pulse generator Download PDF

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Publication number
US2416718A
US2416718A US460328A US46032842A US2416718A US 2416718 A US2416718 A US 2416718A US 460328 A US460328 A US 460328A US 46032842 A US46032842 A US 46032842A US 2416718 A US2416718 A US 2416718A
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US
United States
Prior art keywords
current
inductor
circuit
path
source
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
US460328A
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English (en)
Inventor
Shockley William
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.)
AT&T Corp
Original Assignee
Bell Telephone Laboratories Inc
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 BE468127D priority Critical patent/BE468127A/xx
Priority to NL81365D priority patent/NL81365C/xx
Priority to BE468049D priority patent/BE468049A/xx
Priority to NL72475D priority patent/NL72475C/xx
Priority to BE472898D priority patent/BE472898A/xx
Priority to NL80744D priority patent/NL80744C/xx
Application filed by Bell Telephone Laboratories Inc filed Critical Bell Telephone Laboratories Inc
Priority to US460328A priority patent/US2416718A/en
Priority to US502282A priority patent/US2436395A/en
Priority to US510643A priority patent/US2419227A/en
Priority to US512294A priority patent/US2419201A/en
Priority to GB5936/44A priority patent/GB585359A/en
Priority to GB20671/44A priority patent/GB595312A/en
Priority to GB21783/44A priority patent/GB595317A/en
Priority to GB22631/44A priority patent/GB595319A/en
Priority to CH258731D priority patent/CH258731A/fr
Priority to FR929568D priority patent/FR929568A/fr
Priority to ES175214A priority patent/ES175214A1/es
Priority to FR55270D priority patent/FR55270E/fr
Application granted granted Critical
Publication of US2416718A publication Critical patent/US2416718A/en
Priority to FR57176D priority patent/FR57176E/fr
Priority to DEP28882D priority patent/DE818815C/de
Priority to DEP28892A priority patent/DE811967C/de
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03K—PULSE TECHNIQUE
    • H03K3/00—Circuits for generating electric pulses; Monostable, bistable or multistable circuits
    • H03K3/02—Generators characterised by the type of circuit or by the means used for producing pulses
    • H03K3/53—Generators characterised by the type of circuit or by the means used for producing pulses by the use of an energy-accumulating element discharged through the load by a switching device controlled by an external signal and not incorporating positive feedback
    • H03K3/55—Generators characterised by the type of circuit or by the means used for producing pulses by the use of an energy-accumulating element discharged through the load by a switching device controlled by an external signal and not incorporating positive feedback the switching device being a gas-filled tube having a control electrode
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
    • G01S7/00—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00
    • G01S7/02—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00 of systems according to group G01S13/00
    • G01S7/28—Details of pulse systems
    • G01S7/282—Transmitters
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03K—PULSE TECHNIQUE
    • H03K3/00—Circuits for generating electric pulses; Monostable, bistable or multistable circuits
    • H03K3/02—Generators characterised by the type of circuit or by the means used for producing pulses
    • H03K3/45—Generators characterised by the type of circuit or by the means used for producing pulses by the use, as active elements, of non-linear magnetic or dielectric devices

Definitions

  • This invention relates to pulse generators and transmitters, and particularly to generators for keying or modulating ultrahigh frequency radio transmitters for the transmission of recurrent, short pulses of high power.
  • Various systems for example, distance measuring and object locating systems employ high power recurrent pulses of ultra-high frequency radio waves.
  • Such pulses may be of very short duration compared .to the interval between pulses, for example, the pulse recurrence rate may be of the order of 1000 to 4000 per second while the pulse length is of the order of one mircro-second.
  • An object of the invention is to improve the economy of apparatus and operation of pulse generators.
  • Another object of the invention is to obtain recurrent, short, high energy pulses without a comparable instantaneous demand on the power supply.
  • a further object of the invention is to energize an ultra-high radio frequency oscillation generator with recurrent, short pulses of high voltage direct current from a low voltage direct current source.
  • recurrent high voltage, high energy pulses for impulsing an ultra-high radio frequency oscillation are developed from a lower voltage direct current source by storing energy from the source electromagnetically and electrostatically during the interval between pulses.
  • current from the source flowing through an inductor is interrupted to build up a high voltage charge in a capacitor which charge is released to excite the oscillator during the required pulse period.
  • Figure 1 is a schematic diagram of one embodiment of the invention
  • Figs. 2, 3 and 4 are graphs illustrating voltage and current relations in the circuit of Fig. 1;
  • Fig. 5 is a schematic circuit diagram of a modi fication of the circuit of Fig. 1;
  • Fig. 6 is a graph of the current in one branch of the circuit of Fig. 5;
  • Fig. 7 is a schematic diagram of an alternative circuit arrangement which may be substituted for the portions of the circuits of Fig. 1 or 5 to the right of the dash-dot lines X-X.
  • the invention is employed for producing recurrent short pulses of high power ultra-high frequency radio waves.
  • the ultra-high frequency oscillations are produced in a multicavity magnetron H which may be of the type of United States Patent 2,063,342 to Samuel, December 8, 1936, for example.
  • the anode l2 forms the external sheath or enclosure which it is desirable to maintain at ground potential.
  • a high direct current voltage is impressed between the anode and cathode there are produced high power oscillations of frequency determined by the internal structure of the device as described in more detail in the Samuel patent referred to.
  • These oscillations may be picked up by a loop II and transmitted through a coaxial line 15 to an antenna or other suitable utilization circuit (not shown).
  • one aspect of the present invention relates to the problem of energizing such a generator for the production of recurrent high power pulses of short duration. Because of the relation of the workingportion of such a cycle of operation to the idle portion thereof such a device can be utilized to operate at peak powers far above a safe rating for continuous operation. This, of course, requires high instantaneous power input and in'the interests of economy of both operation and apparatus it is desirable that such inputs be produced from a prime source of power of comparably lower continuous rating and with-' out such peak loads on the prime source.
  • the prime source is a battery 11, though, of course, it may be a rectifler, generator or other direct current source.
  • An inductor or choke coil 18 is connected to the positive terminal of the battery 11.
  • current is caused to flow from the battery 11 through the coil 18 by way of the space path of the vacuum tube l9.
  • this current has reached a value sufficiently high to have stored the required energy in the magnetic field of the coil the flow of current from the battery is interruptcd by blocking the space path of the tube l9.
  • the current will tend to continue to flow in the same direction so that the capacitor or condenser 20 will be charged, the energy stored in the magnetic field of the coil l8 being transferred to the electrostatic field of the condenser 20.
  • a circuit is established at substantially the instant of complete transfer of energy to the condenser 2
  • is controlled by a timing impulse supplied by a suitable source 23 shown in the drawing as a square wave generator.
  • the output of the source 23 is applied to the grid of the tube 9 so that the blocking bias supplied by the battery 22 will be overcome as will be explained in more detail in the paragraph immediately following.
  • the output from source 23 is supplied through the delay circuit 24 to the grid of the tube 2
  • the voltage V1 then drops substantially to ground or zero potential because of the negligible resistance of the space path of tube l9.
  • Current I1 then begins to flow through the coil l8 as shown in Fig. 4, the current gradually increasing with time as is the well recognized condition in an inductive circuit.
  • the voltage E1 applied to the grid of tube i9 drops to zero cutting off the fiow of current through the space path of the tube i9.
  • the current tends to fiow in the same direction through the capacitor 20 and diode 26 charging the condenser 20. This continues until the energy stored in the magnetic field. of the coil I8 is transferred to the dielectric field of the condenser 20.
  • the voltage V1 on the condenser is built up.
  • the energy W stored in the magnetic field is represented by the equation where L equals the inductance of the coil 20 and I the current flowing therethrough, similarly,
  • the triggering off of the gas tube is, therefore, controlled by the same voltage source 23 which sets up the cycle of operation.
  • is determined by the delay circuit 24.
  • Fig. 5 there is shown a. modification of the system of the invention in which the discharge of the condenser may be considered as self-timed. Except for the substitution of the saturable or non-linear inductor 30 for the gas tube, this circuit is identical to that of Fig. 1 and corresponding elements have been given the same reference numerals.
  • an inductor of this type having a magnetic core that is readily saturable while having a high mu at very low fiux densities has an action very analogous to that of a switch.
  • it has a high impedance for low values of current while at some definite low current value the core saturates and th impedance suddenly drops to a very low value, the action in so far as its effect in the associated circuit is concerned may be considered analogous to the closing of a previously opened switch.
  • Fig. 6 The effect of the non-linear inductor 30 may be observed from Fig. 6 in which current is plotted against time, the instants t1, t2 and t3 corre sponding to the time intervals established for circuit operations as indicated in Figs. 2 and 3.
  • the voltage on the condenser 20 builds up during the interval from tz to is a low value of current flows through the inductor 30, the value of the current I3 in the coil being kept very low due to its high inductance in this unsaturated region (the current scale in Fig. 6 is greatly expanded as compared to that of Fig. 4).
  • the blocking condenser 32 prevents the establishment of a steady flow of direct current through the coil 30.
  • Fig. '7 shows a modification of the circuit to the right of the dash-dot line X--X of Fig. 1 or 5.
  • the circuit modification shown in Fig. '7 has been found advantageous particularly with respect to pulse shaping.
  • a retard coil 36 is connected between the anode and cathode of the diode 26.
  • the cathode of the magnetron is given a small positive bias by means of the resistor 84 and battery 33.
  • the retard coil 36 provides a leakage path to prevent static changes from remaining on the cathode of the magnetron I i.
  • the diode 26 performs a function in addition to that of providing a path for the charging current to the capacitor 20. This may be called a pulse forming or clipping action.
  • a pulse forming or clipping action One analysis of this action is based on the fact that it is a characteristic of a magnetron oscillator of the type of the magnetron ii that its output decreases and its effective anode-cathode impedance increases quite abruptly for low anode voltages (below about 50-60 per cent of the optimum value). This results in a residual remaining in the circuit after the useful part of the transmitting pulse. This voltage if uncontrolled would begin a train of damped oscillations among the reactances represented by the coil 36, capacitor 20 and the stray capacities throughout the circuit.
  • a pulse generator comprising a source of di rect current, an inductor, a capacitor, a load circuit having an asymmetrical conduction characteristic, a charging circuit having an asymmetrical conduction characteristic and so connected in shunt to said load circuit as to provide a path for current in the direction opposite to that provided by said load circuit, means for periodically causing a current to flow from said source through said inductor to store energy therein and interrupting said flow of current whereby said energy is transferred to said capacitor through said charging circuit, and means for discharging the energy thus stored in said capacitor through said load circuit.
  • a pulse generator comprising a source of current, an inductor, a capacitor, and a load circuit connected in series with each other, switching means for first establishing a path for the flow of current from said source through said inductor and'next interrupting said circuit to cause said capacitor to be charged to a high voltage by the energy stored in said inductor, and current operated switching means for closing a path for the discharge of said capacitor through said load circuit.
  • a pulse generator for supplying pulses to a unilateral conducting load circuit, comprising a source of direct current, an inductor, a capacitor connected in series with each other and with said load circuit, switching means for periodically establishing a path for the flow of direct current from said source through said inductor and periodically interrupting said flow of direct current, a unilateral conducting device connected in shunt to said load circuit to provide a path for the flow of current from said inductor to said capacitor upon said interruption of said flow of direct current, and switching means for causing the discharge of said condenser through said load circuit at the instant of substantially complete transfer of the energy from said inductor to said capacitor.
  • a system for producing recurrent pulses of ultra-high frequency oscillations comprising, an oscillation generator having a cathode and a grounded anode, a. capacitor having one side connected to said cathode, an inductor having one terminal connected to the other side of said capacitor, a source of direct current voltage having its positive terminal connected to the other terminal of said inductor and its negative terminal grounded, a charging circuit connected in shunt to the space path of said oscillation generator to permit the 'ilow of current in the direction opposite to that permitted by said space path, switching meansconnected between ground and the point of connection of said capacitor and inductor, and means for cyclically operating said switching means, first to close the circuit between said point and ground to permit the flow of current from said source throughsaid inductor, second to open said circuit to interrupt the flow of current from said source and to cause said capacitor to be charged by the electromagnetic energy of said inductor, and third to close said circuit to cause the discharge of said capacitor through the space path of said oscillation generator.
  • a circuit for producing recurrent pulses of direct current through the cathode-anode path of said generator to cause the production of ultrahigh frequency oscillations comprising, a direct current source, an inductor, an electric discharge arrears device having a space path, a control electrode therefor and so connected that current from said source may flow through said space path to said inductor, means for periodically varying the voltage of said control electrode to alternately cause said space path to be conductive whereby energy from said source is stored in the magnetic field of said inductor and to block said space path, a capacitor connected in circuit with said inductor whereby the energy stored in the magnetic field of said inductor is transferred to the electrostatic field of said capacitor when said space path is blocked, and switching means for discharging the energy stored in the dielectric field of said capacitor through the anode-cathode path of said generator, said switching means
  • a circuit for producing recurrent pulses of direct current through the anode-cathode path of said generator comprising a unilateral conductive device so connected in shunt to the anodecathode path of said generator as to provide a path for current in the direction opposite to that provided by said anode-cathode path, a source of direct current, an inductor, and a capacitor connected in series with each other and the parallel circuit formed by said unilateral conducting device and said anode-cathode path, an electric discharge device having a control electrode and a space path connected to form a path for direct current from said source to said inductor, means for normally biasing said control electrode to block said space path, a'source of timing pulses, means for impressing timing pulses from said source on said control electrode to periodically render said space path conductive whereby energy from said direct current source is stored in said induct
  • a magnetron oscillator having an anode and a cathode and adapted when energized by said anode being made positive with respect to said cathode to produce ultra-high tive to cause the flow of current from said source through said inductor, means for blocking said anode-cathode path. to interrupt said flow of current and cause said capacitor to be charged by the energy stored in the magnetic field of said inductor, and means for impulsing the discharge control element of said gaseous discharge device to discharge said condenser through said magnetron.
  • an oscillator having an anode and a cathode, a circuit for producing recurrent short pulses of direct current for energizing said oscillator for generating the ultrahigh frequency oscillations, and a unilateral conducting device connected in shunt to the anodeeathode path of said oscillator to provide a conduction path in the direction opposite to that provided by said anode-cathode path.
  • a magnetron oscillator having an anode and a cathode, a source of short pulses of direct current for energizing said oscillator, and a unilateral conducting device so connected in shunt to the anode-cathode path of said oscillator as to provide a conduction path in the direction opposite to that provided by said anode-cathode path.
  • a recurrent pulse generator comprising a load circuit, a source of direct current,'an inductor, a blocking capacitor, means for alternately establishing a flow of direct current from said source through said inductor-and for interrupting said flow, a storage capacitor connected to be charged by the surge developed by the interruption of said flow, an inductor having a core oi.
  • a recurrent pulse generator comprising a load circuit, a direct current source, an inductor, a capacitor, circuit connections including said load circuit, said direct current source, said inductor and said capacitor in series with each other, switching means for alternately establishing a flow of current from said source to said inductor and interrupting said flow of current whereby said capacitor becomes charged to a high voltage by the surge produced upon the interruption of said flow of current, and an inductor having a core of magnetic material of high permeability at low flux densities and readily saturable at higher flux densities and a winding thereon connected effectively in shunt to said 4 switching means whereby said core becomes saturated by the current produced through said 12.
  • a circuit for producing recurrent pulses of direct current through the anode-cathode path of said generator comprising, a unilateral conductive device so connected in shunt to the anodecathode path of said generator as to provide a path for current in the direction opposite to that provided by said anode-cathode path, a source of direct current, an inductor, a capacitor, circuit connections including said source of direct current, said inductor, said capacitor and the parallel circuit formed by said unilateral conducting device and said anode-cathode path in series with each other, an electric discharge device having a space path connected to form a path for direct current from said source through said inductor and a control electrode, a source of re- REFERENCES CITED

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • General Physics & Mathematics (AREA)
  • Radar, Positioning & Navigation (AREA)
  • Remote Sensing (AREA)
  • Nonlinear Science (AREA)
  • Generation Of Surge Voltage And Current (AREA)
  • Microwave Tubes (AREA)
  • Dc-Dc Converters (AREA)
US460328A 1942-10-01 1942-10-01 Pulse generator Expired - Lifetime US2416718A (en)

Priority Applications (21)

Application Number Priority Date Filing Date Title
BE468127D BE468127A (nl) 1942-10-01
NL81365D NL81365C (nl) 1942-10-01
BE468049D BE468049A (nl) 1942-10-01
NL72475D NL72475C (nl) 1942-10-01
BE472898D BE472898A (nl) 1942-10-01
NL80744D NL80744C (nl) 1942-10-01
US460328A US2416718A (en) 1942-10-01 1942-10-01 Pulse generator
US502282A US2436395A (en) 1942-10-01 1943-09-14 Pulse generator
US510643A US2419227A (en) 1942-10-01 1943-11-17 Pulse generator
US512294A US2419201A (en) 1942-10-01 1943-11-30 Pulse generator
GB5936/44A GB585359A (en) 1942-10-01 1944-03-30 Improvements in electric pulse generators
GB20671/44A GB595312A (en) 1942-10-01 1944-10-24 Improvements in electric pulse generators
GB21783/44A GB595317A (en) 1942-10-01 1944-11-06 Improvements in electric pulse generators
GB22631/44A GB595319A (en) 1942-10-01 1944-11-15 Improvements in electric pulse generators
CH258731D CH258731A (fr) 1942-10-01 1946-06-06 Générateur d'impulsions électriques.
FR929568D FR929568A (fr) 1942-10-01 1946-06-21 Perfectionnements aux générateurs d'impulsions électriques
ES175214A ES175214A1 (es) 1942-10-01 1946-09-30 Un generador de pulsaciones eléctricas
FR55270D FR55270E (nl) 1942-10-01 1947-03-03
FR57176D FR57176E (fr) 1942-10-01 1947-03-06 Perfectionnement aux générateurs d'impulsions électriques
DEP28882D DE818815C (de) 1942-10-01 1948-12-31 Impulsgenerator
DEP28892A DE811967C (de) 1942-10-01 1948-12-31 Impulsgenerator

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US460328A US2416718A (en) 1942-10-01 1942-10-01 Pulse generator

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US2416718A true US2416718A (en) 1947-03-04

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US460328A Expired - Lifetime US2416718A (en) 1942-10-01 1942-10-01 Pulse generator

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Country Link
US (1) US2416718A (nl)
BE (3) BE468127A (nl)
CH (1) CH258731A (nl)
DE (2) DE811967C (nl)
ES (1) ES175214A1 (nl)
FR (3) FR929568A (nl)
GB (4) GB585359A (nl)
NL (3) NL72475C (nl)

Cited By (20)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2458574A (en) * 1943-04-10 1949-01-11 Rca Corp Pulse communication
US2462872A (en) * 1946-02-27 1949-03-01 Raytheon Mfg Co Inverter
US2499546A (en) * 1943-05-21 1950-03-07 Hartford Nat Bank & Trust Co Device for making short-time exposures by means of x-rays
US2500328A (en) * 1945-03-27 1950-03-14 Raytheon Mfg Co Pulsed oscillator of the magnetron type
US2517031A (en) * 1946-03-02 1950-08-01 Sylvania Electric Prod Flash producing apparatus
US2533285A (en) * 1944-07-06 1950-12-12 Sager Irving Line pulse modulator
US2534261A (en) * 1944-07-06 1950-12-19 John E Gorham Line pulse modulator
US2596984A (en) * 1945-02-19 1952-05-20 Us Sec War Pulse system
US2597013A (en) * 1943-03-03 1952-05-20 Us Sec War Pulse modulator circuit
US2599890A (en) * 1945-11-28 1952-06-10 Us Navy High-voltage choked filament feed
US2700121A (en) * 1947-03-03 1955-01-18 Kenneth J Germeshausen Electric system
US2700120A (en) * 1947-03-03 1955-01-18 Kenneth J Germeshausen Electric system
US2722629A (en) * 1946-06-28 1955-11-01 Kenneth J Germeshausen Electric system
US2736800A (en) * 1950-01-11 1956-02-28 Hartford Nat Bank & Trust Co Device for producing voltage-impulses of short-duration, wherein a discharge-path, which is conductive in a negative direction with respect to the pulses, is connected in parallel with the load
US2750503A (en) * 1952-11-14 1956-06-12 Thomas L Gottier Magnetron keying circuit
US2808511A (en) * 1955-03-16 1957-10-01 Bell Telephone Labor Inc Pulse generators with pulse shaping
US2864058A (en) * 1955-10-03 1958-12-09 Gen Precision Lab Inc Protective circuit for pulsed microwave generator
US2923933A (en) * 1960-02-02 shepard
US3121800A (en) * 1960-06-29 1964-02-18 Ibm Pulse generating circuit
US20200343432A1 (en) * 2017-10-04 2020-10-29 Calagen, Inc. Oscillation-driven power generation

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2166928A (en) * 1984-11-09 1986-05-14 David Michael Hine Extra low frequency long range wireless signalling/paging pulse sending apparatus

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB400976A (en) * 1932-04-04 1933-11-06 Emi Ltd Improvements relating to oscillatory electric circuits, such as may be used, for example, in connection with cathode ray devices
US2037799A (en) * 1934-02-28 1936-04-21 Rca Corp Ultrahigh frequency device
US2047431A (en) * 1934-08-18 1936-07-14 Gen Motors Corp Ignition system
US2103362A (en) * 1933-06-13 1937-12-28 Rca Corp Ultrahigh frequency magnetron oscillator

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB400976A (en) * 1932-04-04 1933-11-06 Emi Ltd Improvements relating to oscillatory electric circuits, such as may be used, for example, in connection with cathode ray devices
US2103362A (en) * 1933-06-13 1937-12-28 Rca Corp Ultrahigh frequency magnetron oscillator
US2037799A (en) * 1934-02-28 1936-04-21 Rca Corp Ultrahigh frequency device
US2047431A (en) * 1934-08-18 1936-07-14 Gen Motors Corp Ignition system

Cited By (20)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2923933A (en) * 1960-02-02 shepard
US2597013A (en) * 1943-03-03 1952-05-20 Us Sec War Pulse modulator circuit
US2458574A (en) * 1943-04-10 1949-01-11 Rca Corp Pulse communication
US2499546A (en) * 1943-05-21 1950-03-07 Hartford Nat Bank & Trust Co Device for making short-time exposures by means of x-rays
US2533285A (en) * 1944-07-06 1950-12-12 Sager Irving Line pulse modulator
US2534261A (en) * 1944-07-06 1950-12-19 John E Gorham Line pulse modulator
US2596984A (en) * 1945-02-19 1952-05-20 Us Sec War Pulse system
US2500328A (en) * 1945-03-27 1950-03-14 Raytheon Mfg Co Pulsed oscillator of the magnetron type
US2599890A (en) * 1945-11-28 1952-06-10 Us Navy High-voltage choked filament feed
US2462872A (en) * 1946-02-27 1949-03-01 Raytheon Mfg Co Inverter
US2517031A (en) * 1946-03-02 1950-08-01 Sylvania Electric Prod Flash producing apparatus
US2722629A (en) * 1946-06-28 1955-11-01 Kenneth J Germeshausen Electric system
US2700121A (en) * 1947-03-03 1955-01-18 Kenneth J Germeshausen Electric system
US2700120A (en) * 1947-03-03 1955-01-18 Kenneth J Germeshausen Electric system
US2736800A (en) * 1950-01-11 1956-02-28 Hartford Nat Bank & Trust Co Device for producing voltage-impulses of short-duration, wherein a discharge-path, which is conductive in a negative direction with respect to the pulses, is connected in parallel with the load
US2750503A (en) * 1952-11-14 1956-06-12 Thomas L Gottier Magnetron keying circuit
US2808511A (en) * 1955-03-16 1957-10-01 Bell Telephone Labor Inc Pulse generators with pulse shaping
US2864058A (en) * 1955-10-03 1958-12-09 Gen Precision Lab Inc Protective circuit for pulsed microwave generator
US3121800A (en) * 1960-06-29 1964-02-18 Ibm Pulse generating circuit
US20200343432A1 (en) * 2017-10-04 2020-10-29 Calagen, Inc. Oscillation-driven power generation

Also Published As

Publication number Publication date
BE468127A (nl)
NL72475C (nl)
GB585359A (en) 1947-02-05
BE472898A (nl)
BE468049A (nl)
GB595317A (en) 1947-12-02
NL80744C (nl)
FR929568A (fr) 1947-12-31
DE818815C (de) 1951-10-29
FR55270E (nl) 1952-01-02
NL81365C (nl)
FR57176E (fr) 1952-12-16
GB595319A (en) 1947-12-02
ES175214A1 (es) 1946-11-16
CH258731A (fr) 1948-12-15
GB595312A (en) 1947-12-02
DE811967C (de) 1951-08-27

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