GB1157194A - Magnetron Temperature Control - Google Patents

Magnetron Temperature Control

Info

Publication number
GB1157194A
GB1157194A GB15569/67A GB1556967A GB1157194A GB 1157194 A GB1157194 A GB 1157194A GB 15569/67 A GB15569/67 A GB 15569/67A GB 1556967 A GB1556967 A GB 1556967A GB 1157194 A GB1157194 A GB 1157194A
Authority
GB
United Kingdom
Prior art keywords
magnetron
cathode
cell
capacitor
radiation
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
Application number
GB15569/67A
Inventor
John Denis Morris
Kenneth Hilton
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.)
HIRST MICROWAVE HEATING Ltd
Original Assignee
HIRST MICROWAVE HEATING Ltd
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 HIRST MICROWAVE HEATING Ltd filed Critical HIRST MICROWAVE HEATING Ltd
Priority to GB15569/67A priority Critical patent/GB1157194A/en
Priority to FR1556837D priority patent/FR1556837A/fr
Priority to DE19681766124 priority patent/DE1766124A1/en
Publication of GB1157194A publication Critical patent/GB1157194A/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J1/00—Details of electrodes, of magnetic control means, of screens, or of the mounting or spacing thereof, common to two or more basic types of discharge tubes or lamps
    • H01J1/02—Main electrodes
    • H01J1/13—Solid thermionic cathodes
    • H01J1/135—Circuit arrangements therefor, e.g. for temperature control
    • G—PHYSICS
    • G05—CONTROLLING; REGULATING
    • G05D—SYSTEMS FOR CONTROLLING OR REGULATING NON-ELECTRIC VARIABLES
    • G05D23/00—Control of temperature
    • G05D23/19—Control of temperature characterised by the use of electric means
    • G05D23/1906—Control of temperature characterised by the use of electric means using an analogue comparing device
    • G—PHYSICS
    • G05—CONTROLLING; REGULATING
    • G05D—SYSTEMS FOR CONTROLLING OR REGULATING NON-ELECTRIC VARIABLES
    • G05D23/00—Control of temperature
    • G05D23/19—Control of temperature characterised by the use of electric means
    • G05D23/27—Control of temperature characterised by the use of electric means with sensing element responsive to radiation

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Automation & Control Theory (AREA)
  • Microwave Tubes (AREA)
  • Control Of High-Frequency Heating Circuits (AREA)

Abstract

1,157,194. Automatic temperature control systems. HIRST (MICROWAVE HEATING) Ltd March 14, 1968 [April 5, 1967], No.15569/67. Heading G3R. To compensate for the heating effect of electronic bombardment of a magnetron cathode, the cathodic radiation is sensed by a photosensitive cell 20 which regulates the cathode heater current. A photo-resistive cell 20 sensing cathodic radiation is connected across a capacitor 21 forming one arm of a bridge circuit having other arms 24-28 controlling, through a transistor 30, the charging current of a capacitor 32 from a synchronized squarewave supply 37-40. The capacitor 32 is periodically discharged by a unijunction transistor 35 through a winding of a transformer 33 which supplies firing pulses to thyristors 17, the angle of conduction being determined by the resistance of cell 20. The heater supply 18, 19 has an NTC resistor 16 in series to limit the initial heater current to twice normal. The arrangement is stated to allow a greater degree of mismatch between a magnetron and a load than would otherwise be possible without deterioration of the magnetron. Where the magnetron output is fed to a continuously moving sheet which, if it suddenly comes to an end, no longer provides an absorptive load, a sudden increase in the reflected power incident on the magnetron cathode is compensated. The magnetron envelope has window which admits radiation from the cathode to the cell.
GB15569/67A 1967-04-05 1967-04-05 Magnetron Temperature Control Expired GB1157194A (en)

Priority Applications (3)

Application Number Priority Date Filing Date Title
GB15569/67A GB1157194A (en) 1967-04-05 1967-04-05 Magnetron Temperature Control
FR1556837D FR1556837A (en) 1967-04-05 1968-03-20
DE19681766124 DE1766124A1 (en) 1967-04-05 1968-04-05 Control arrangement for the power supply of the cathode heating of a magnetron

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB15569/67A GB1157194A (en) 1967-04-05 1967-04-05 Magnetron Temperature Control

Publications (1)

Publication Number Publication Date
GB1157194A true GB1157194A (en) 1969-07-02

Family

ID=10061464

Family Applications (1)

Application Number Title Priority Date Filing Date
GB15569/67A Expired GB1157194A (en) 1967-04-05 1967-04-05 Magnetron Temperature Control

Country Status (3)

Country Link
DE (1) DE1766124A1 (en)
FR (1) FR1556837A (en)
GB (1) GB1157194A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1998025286A1 (en) * 1996-12-02 1998-06-11 Advanced Ferrite Technology Gmbh Method and device for setting the heating power of a magnetron cathode
EP2073242A3 (en) * 2007-12-21 2010-01-13 Siemens Aktiengesellschaft Tube, especially electron tube

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4005370A (en) * 1974-09-10 1977-01-25 Matsushita Electric Industrial Co., Ltd. Power supply means for magnetron
JPS5146444A (en) * 1974-10-18 1976-04-20 Matsushita Electric Ind Co Ltd Koshuhakanetsusochi
US4049938A (en) * 1975-05-17 1977-09-20 Matsushita Electric Industrial Co., Ltd. Microwave oven

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1998025286A1 (en) * 1996-12-02 1998-06-11 Advanced Ferrite Technology Gmbh Method and device for setting the heating power of a magnetron cathode
EP2073242A3 (en) * 2007-12-21 2010-01-13 Siemens Aktiengesellschaft Tube, especially electron tube

Also Published As

Publication number Publication date
FR1556837A (en) 1969-02-07
DE1766124A1 (en) 1971-06-03

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Legal Events

Date Code Title Description
PS Patent sealed
PLNP Patent lapsed through nonpayment of renewal fees