US3351808A - Feed current control for pulse-modulated magnetron transmitter - Google Patents

Feed current control for pulse-modulated magnetron transmitter Download PDF

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Publication number
US3351808A
US3351808A US388816A US38881664A US3351808A US 3351808 A US3351808 A US 3351808A US 388816 A US388816 A US 388816A US 38881664 A US38881664 A US 38881664A US 3351808 A US3351808 A US 3351808A
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US
United States
Prior art keywords
magnetron
pulse
cathode
voltage
current
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
US388816A
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English (en)
Inventor
Hurlimann Armin
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.)
Siemens Schweiz AG
Albiswerk Zuerich AG
Original Assignee
Siemens Albis AG
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 Siemens Albis AG filed Critical Siemens Albis AG
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Publication of US3351808A publication Critical patent/US3351808A/en
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Classifications

    • 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
    • H03B9/00—Generation of oscillations using transit-time effects
    • H03B9/01—Generation of oscillations using transit-time effects using discharge tubes
    • H03B9/10—Generation of oscillations using transit-time effects using discharge tubes using a magnetron
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03C—MODULATION
    • H03C5/00—Amplitude modulation and angle modulation produced simultaneously or at will by the same modulating signal
    • H03C5/02—Amplitude modulation and angle modulation produced simultaneously or at will by the same modulating signal by means of transit-time tube
    • H03C5/04—Amplitude modulation and angle modulation produced simultaneously or at will by the same modulating signal by means of transit-time tube the tube being a magnetron
    • 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
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03K—PULSE TECHNIQUE
    • H03K3/00—Circuits for generating electric pulses; Monostable, bistable or multistable circuits
    • H03K3/80—Generating trains of sinusoidal oscillations

Definitions

  • an additional D.C. amplifier is required, with an amplification ratio of at least 1:1000.
  • the cost of such an amplifier is out of proportion to the costs of the apparatus itself and thus unjustified economically.
  • An object of the present invention is to provide an improved control circuit for reducing the power of magnetrons during the pre-heating period of the cathode, Which is simple, inexpensive and without mechanical contacts.
  • Yet another object of the invention is to provide a control circuit for reducing the power of a magnetron during the pro-heating, and which control circuit involves solely solid state components.
  • the disadvantges of known starting up arrangements for pre-heating the cathodes of thermionic valves are avoided by reducing the feed voltage to the pulse modulator during the cathode heating up period of a magnetron by the use of a series resistance in the modulator supply voltage circuit.
  • Means are provided for bridging this series re- 3,351,808 Patented Nov. 7, 1967 sistance in accordance with the thermal emission of the cathode.
  • the series resistance is included in the feed circuit for the pulse modulator being supplied with a DC. voltage.
  • the emission of the cathode in any case, is derived or measured from the voltage drop efiected by the mean anode current across an adjustable resistance, such as an adjustable voltage divider, connected in the anode circuit of the magnetron.
  • a semi-conductor or silicon control rectifier is connected for bridging such series resistance.
  • a transistor connected as an emitter follower, has its control or input voltage derived from the tap of the adjustable resistance or voltage divider, and the output or emitter current of the transistor is supplied to the control element, such as to the gate of a silicon control rectifier.
  • the conductivity of the semiconductor is thus controlled by the output or emitter current of the transistor as a function of the measured anode current of the valve which, in turn, is a measure of the thermal emission of the cathode.
  • the single figure is a schematic wiring diagram illustrating a pulse-modulated magnetron transmitter embodying the invention.
  • a line-type modulator M has a direct feed voltage applied thereto from a rectifier G connected across a suitable source of AC. potential.
  • One of the two feed lines between rectifier G and modulator M is grounded, and this grounded feed line has a resistance R1 connected therein and bridged -by a semi-conductor thyratron Th.
  • Thyratron Th may advantageously be a silicon control rectifier, which is a solid state device whose conductivity is determined by the current applied to a control element or electrode usually termed gate.
  • the output of line-type modulator M is applied to the primary winding of a pulse transformer Tr].
  • This transformer has a first secondary winding W1 and a second secondary winding W2. Corresponding terminals of both of these secondary windings are connected to respective terminals of a source of AC. potential indicated at Q, and the corresponding opposite terminals of these secondary windings are connected to respective opposite ends of the primary winding of a heater circuit transformer TrH.
  • the secondary winding of the heater circuit transformer supplies the heating voltage for the cathode of a magnetron valve S.
  • secondary winding W2 is also connected with the adjacent terminal of the secondary winding of the heating transformer TrH.
  • the anode of magnetron valve S is grounded.
  • a voltage divider R2, R3, which is bridged by a condenser C, is connected between ground and the A.C. feed of secondary winding W2 of pulse transformer TrJ.
  • Resistance R2 of this voltage divider is provided with an adjustable tap which is connected to the base of an NPN transistor T.
  • the collector of this transistor is connected through a collector resistance R4 to a source of positive potential.
  • the emitter of transistor T is connected with a control electrode of the semi-conductor thyrtatron Th, which control electrode may be the gate of a silicon control rectifier.
  • the line-type modulator M and the rectifier G are shown only in the form of blocks, as the: types used are well known.
  • types used are well known.
  • line modulator M is fed from rectifier G through resistance R1, as semi-conductor thyratron Th is, at such time, non-conductive.
  • Modulator M thereby operates with a reduced supply voltage, and thus supplies pulses of only a very small amplitude to pulse transformer Tr].
  • the amplitude of these pulses must be such that, in spite of the insufficiently heated cathode of magnetron valve S, no dangerously excessive voltages can appear aoross second secondary winding W2 of pulse transformer Tr]. This can be efiected by a proper selection of the value of series resistance R1.
  • a mean anode current flows through magnetron valve S.
  • This mean anode current produces a voltage drop across the voltage divider R2, R3, so that a voltage is applied to the base of transistor T from the tap of resistance R2.
  • Transistor T thus begins to be conductive with the increasing voltage drop across resistor R2, and accordingly a current begins to flow from the emitter of transistor T to the control electrode or gate of semi-conductor thyratron, or silicon control rectifier, Th.
  • this control current reaches a threshold value, the semi-conductor thyratron becomes conductive and feeds the full DC. voltage from rectifier G to linetype modulator M, thus bypassing or short circuiting series resistor R1.
  • the sensitivity of the described arrangement which can be adjusted by means of the adjustable resistance R2, is a function of the temperature dependence of the current amplification of transistor T and that of semiconductor thyratron Th.
  • a pulse-modulated magnetron transmitter comprising, in combination, a magnetron having an anode and a heated cathode; a heating circuit for said cathode; a pulsemodulator connected to said cathode to supply operating pulses to said magnetron; a DC.
  • a supply circuit connecting said source to said modulator; a series resistance in said supply circuit to reduce the current supplied to said modulator during heating of said cathode; a semi-conductor thyratron connected in shunt with said series resistance; an adjustable voltage divider connected in the anode circuit of said magnetron to provide a voltage drop corresponding to the measured mean anode current of said magnetron; and a transistor having its input circuit connected to said adjustable voltage divider and its output circuit connected to said thyratron to supply a control current to said thyratron corresponding to the measured value of the mean anode current of said magnetron.

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  • Control Of High-Frequency Heating Circuits (AREA)
  • Microwave Tubes (AREA)
US388816A 1963-08-28 1964-08-11 Feed current control for pulse-modulated magnetron transmitter Expired - Lifetime US3351808A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CH1063463A CH403884A (de) 1963-08-28 1963-08-28 Impulsmodulierter Magnetronsender

Publications (1)

Publication Number Publication Date
US3351808A true US3351808A (en) 1967-11-07

Family

ID=4365265

Family Applications (1)

Application Number Title Priority Date Filing Date
US388816A Expired - Lifetime US3351808A (en) 1963-08-28 1964-08-11 Feed current control for pulse-modulated magnetron transmitter

Country Status (7)

Country Link
US (1) US3351808A (de)
CH (1) CH403884A (de)
DE (1) DE1270628B (de)
FR (1) FR1405181A (de)
GB (1) GB1014329A (de)
NL (1) NL6409643A (de)
SE (1) SE306563B (de)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3392309A (en) * 1965-05-24 1968-07-09 Philips Corp Magnetron power supply and cathode heater circuit
US3671847A (en) * 1970-03-20 1972-06-20 Matsushita Electric Ind Co Ltd Power supply for driving magnetron
DE2736594A1 (de) * 1976-08-13 1978-02-16 Raytheon Co Schaltungsanordnung zur uebertragung von radarimpulssignalen in einem radarsystem mit automatischer kompensierung der heizleistung einer endstufe
DE2808498A1 (de) * 1978-02-28 1979-08-30 Licentia Gmbh Laufzeitketten-impulsmodulator

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR3055973B1 (fr) * 2016-09-15 2020-01-03 Thales Emetteur radar muni d'au moins un tube hyperfrequence

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2507282A (en) * 1942-11-24 1950-05-09 Stivin Jiri Electric circuits
US2697171A (en) * 1950-04-07 1954-12-14 Westinghouse Electric Corp Oscillator system
US2940010A (en) * 1959-05-18 1960-06-07 Gen Precision Inc Automatic control circuit
US3171040A (en) * 1961-01-16 1965-02-23 Gen Dynamics Corp Fast charging circuit for pulse networks

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1031339A (fr) * 1951-01-24 1953-06-23 Limiteur de tension pour appareils à tubes électroniques

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2507282A (en) * 1942-11-24 1950-05-09 Stivin Jiri Electric circuits
US2697171A (en) * 1950-04-07 1954-12-14 Westinghouse Electric Corp Oscillator system
US2940010A (en) * 1959-05-18 1960-06-07 Gen Precision Inc Automatic control circuit
US3171040A (en) * 1961-01-16 1965-02-23 Gen Dynamics Corp Fast charging circuit for pulse networks

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3392309A (en) * 1965-05-24 1968-07-09 Philips Corp Magnetron power supply and cathode heater circuit
US3671847A (en) * 1970-03-20 1972-06-20 Matsushita Electric Ind Co Ltd Power supply for driving magnetron
DE2736594A1 (de) * 1976-08-13 1978-02-16 Raytheon Co Schaltungsanordnung zur uebertragung von radarimpulssignalen in einem radarsystem mit automatischer kompensierung der heizleistung einer endstufe
FR2361666A1 (fr) * 1976-08-13 1978-03-10 Raytheon Co Radar a puissance de sortie stable
US4171514A (en) * 1976-08-13 1979-10-16 Raytheon Company Radar system with stable power output
DE2808498A1 (de) * 1978-02-28 1979-08-30 Licentia Gmbh Laufzeitketten-impulsmodulator

Also Published As

Publication number Publication date
NL6409643A (de) 1965-03-01
DE1270628B (de) 1968-06-20
GB1014329A (de) 1965-12-22
FR1405181A (fr) 1965-07-02
SE306563B (de) 1968-12-02
CH403884A (de) 1965-12-15

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