US2752500A - Pulse generator - Google Patents

Pulse generator Download PDF

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Publication number
US2752500A
US2752500A US398141A US39814153A US2752500A US 2752500 A US2752500 A US 2752500A US 398141 A US398141 A US 398141A US 39814153 A US39814153 A US 39814153A US 2752500 A US2752500 A US 2752500A
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US
United States
Prior art keywords
magnetron
voltage
impulse
parallel
energisation
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
US398141A
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English (en)
Inventor
Bruyning Hugo Georg
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
Original Assignee
Hartford National Bank and Trust 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
Application filed by Hartford National Bank and Trust Co filed Critical Hartford National Bank and Trust Co
Application granted granted Critical
Publication of US2752500A publication Critical patent/US2752500A/en
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
    • H03K3/78—Generating a single train of pulses having a predetermined pattern, e.g. a predetermined number
    • 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
    • H03K3/53—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

Definitions

  • the invention may be used with particular advantage in producing carrier-wave impulses having a high peak power, for example of several times ten kw. or more and a short impulse duration, for example 1 ,u. sec. or less.
  • the artificial line is first charged to a high direct voltage and then the artificial line is discharged via the magnetron by means of a switch consisting of an electron-discharge tube, a gasfilled tube or a spark gap, the impulse transformer provided between the magnetron and the artificial line serving interalia for impedance-matching.
  • means should be provided for limiting the steepness of the flank of the energising pulses in order to prevent a given limit of said steepness of the flank of the energisation pulses from being surpassed.
  • the maximum permissible steepness of the leading edges of the 'energising pulses is 110 kv. n sec.
  • magnetron generators for high peak powers and a particularly short impulse duration for example 0.1 to (3.25 a sec, particular attention must be given to this condition.
  • the present invention has for its object an improved arrangement of the type referred to in the preamble, which comprises means for limiting the flank-steepness of the energisation pulses and may also be used with pulse generators having a connecting cable of considerable length, for example 30 meters, being provided between the impulse transformer and the artificial line.
  • said means comprises the series-connection of a capacitor and a voltage-dependent resistor whose value decreases with increasing voltage, 70 said series-connection being provided in parallel with a winding of the impulse transformer.
  • Fig. 1 shows a circuit-arrangement according to the invention, comprising a magnetron to be energised by impulses,
  • Figs. 2a to 2c show time diagrams for explaining the operation of a circuit-arrangement shown in Fig. 1, and
  • Fig. 3 shows an alternative arrangement of a part of the circuit.
  • Fig. 1 shows a device according to the invention which comprises a direct current source 1 connected via a choke coil 3 and a resistor 4 to an artificial line 2 for charging it.
  • a normally cut-0d, grid-controlled gasdischarge tube 5 which is made conductive by control impulses supplied to its grid.
  • the artificial line 2 becomes discharged through the primary winding of the transformer 7 and supplies an energisation impulse for the magnetron which then supplies a carrier-wave impulse of, say, approximately 0.1 n sec. of high power.
  • the secondary winding of the transformer 7 may, as customary, be bifilar in conjunction with the supply of heating current for the cathode of the magnetron.
  • the circuit-arrangement described comprises means for limiting the flanksteepness of the energisation impulses.
  • said means comprises the series-connection of a capacitor 9 and a voltage-dependent resistor 10 whose value of resistance decreases with increasing voltage, said series-connection being provided in parallel with the secondary winding of the impulse transformer 7.
  • the voltage-dependent resistor may, for example, mainly consist of silicon carbide and filling material.
  • Fig. 2a represents the voltage across the secondary terminals of the impulse transformer 7, and Figures 2b and 26 represents the current taken up by the network 9, 1'0 and the current to the magnetron respectively.
  • the tube 5 acting as a switch has been made conductive by a control impulse, thus permitting the artificial line 2, which has been charged to a high direct voltage, to become discharged via the connecting line 6, the impulse transformer 7 and said tube 5.
  • the load of the impulse generator then mainly consisting of the parallel capacitance 11 of the magnetron 3, which capacitance is shown in broken lines in Fig. 1.
  • the capacitance 11 becomes rapidly charged, and the voltage across the magnetron 8 and the network 9, 10 rises rapidly to a value E1 which is attained at the instant T1, as shown in Fig. 2a.
  • the current of To to T1, as shown in Fig. 2c, is the charging current of the magnetron capacitance 11.
  • the voltage of the magnetron 8 after the instant T1 increases less rapidly than before, as shown in Fig. 2a.
  • the rate of the voltage increase at the magnetron 8 from the instant Ti onwards until attaining the energisation voltage E2 at the instant T2 is adjustable at will by a suitable proportioning of the network 9, 10.
  • the magnetron draws a strong current irn' pulse and supplies a carrier-wave impulse of, say O.l ,u, see. during the interval T2 to T3. During this time interval the network 9, it does not take up appreciable energy.
  • the network 9, instead of 'being connected in parallel with the secondary of the impulse transformer 7 may be connected in parallel with the primary, but in the lastmentioned case it is found to be more difiicul't to obtain the desired shape of the flank.
  • a self-inductance 12 (Fig. 3) is connected in series with the capacitor 9 and the voltagedependent resistor 1(!. This measure yields the advantage that the loss of energy in the voltage-dependent resistor 10 is reduced, since, in order to obtain the desired form of the leading edge of the energisation pulses, a smaller voltage-dependent resistor may now be employed.
  • a circuit-arrangement comprising a pulse-operated device, a source of electrical pulses connected in parallel with said device, and a series combination of a capacitor and a voltage-dependent resistor the resistance cl which decreases with an increase in applied voltage, said combination being connected in parallel with said device and said source of pulses.
  • a circuit-arrangement comprising a pulse-operated device, a source of electrical pulses, a transformer having a primary winding connected in parallel with said source and a secondary winding connected in parallel with said device, and a series combination of a capacitor and a voltage-dependent resistor the resistance of which decreases with an increase in applied voltage, said series combination being connected in parallel with one of said windings.
  • a circuit-arrangement comprising a source of direct voltage, a two-terminal artificial line, current-conductive means connected between a terminal of said voltage source and a first terminal of said line, a transformer having a primary winding connected between the remaining terminal of said line and the remaining terminal of said voltage source and having a secondary winding, a switch device connected between said first terminal and said remaining terminal of the voltage source, means connected to periodically operate said switch device to discharge said line, a magnetron connected in parallel with said secondary Winding, and a series combination of a capacitor and a voltage-dependent resistor the resistance of which decreases with an increase in applied voltage, said series combination being connected in parallel with said secondary winding and said magnetron.

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Radar, Positioning & Navigation (AREA)
  • Remote Sensing (AREA)
  • Microwave Tubes (AREA)
  • Generation Of Surge Voltage And Current (AREA)
  • Control Of High-Frequency Heating Circuits (AREA)
US398141A 1952-12-24 1953-12-14 Pulse generator Expired - Lifetime US2752500A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
NL316985X 1952-12-24

Publications (1)

Publication Number Publication Date
US2752500A true US2752500A (en) 1956-06-26

Family

ID=19783839

Family Applications (1)

Application Number Title Priority Date Filing Date
US398141A Expired - Lifetime US2752500A (en) 1952-12-24 1953-12-14 Pulse generator

Country Status (7)

Country Link
US (1) US2752500A (en))
BE (1) BE525247A (en))
CH (1) CH316985A (en))
DE (1) DE926259C (en))
FR (1) FR1089820A (en))
GB (1) GB727640A (en))
NL (2) NL91358C (en))

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3105169A (en) * 1959-01-27 1963-09-24 Bell Telephone Labor Inc Pulse generator
US3524071A (en) * 1966-11-03 1970-08-11 Sinclair Research Inc Oscillatory pulse forming circuit

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1191713B (de) * 1959-11-02 1965-04-22 Bernhard Pfeiffer Vorrichtung zum Abbinden von Wurstdaermen od. dgl.
GB2413446B (en) * 2001-09-10 2006-06-14 Furuno Electric Co Magnetron drive circuit

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2555305A (en) * 1946-02-04 1951-06-05 Raymond L Alty Pulsing circuit
US2633536A (en) * 1945-04-07 1953-03-31 David F Winter Ultrahigh-frequency pulsing system

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2633536A (en) * 1945-04-07 1953-03-31 David F Winter Ultrahigh-frequency pulsing system
US2555305A (en) * 1946-02-04 1951-06-05 Raymond L Alty Pulsing circuit

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3105169A (en) * 1959-01-27 1963-09-24 Bell Telephone Labor Inc Pulse generator
US3524071A (en) * 1966-11-03 1970-08-11 Sinclair Research Inc Oscillatory pulse forming circuit

Also Published As

Publication number Publication date
NL174892B (nl)
DE926259C (de) 1955-04-14
NL91358C (en))
FR1089820A (fr) 1955-03-22
GB727640A (en) 1955-04-06
BE525247A (en))
CH316985A (de) 1956-10-31

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