GB629619A - Improvements in control systems for x-ray tubes - Google Patents

Improvements in control systems for x-ray tubes

Info

Publication number
GB629619A
GB629619A GB36726/46A GB3672646A GB629619A GB 629619 A GB629619 A GB 629619A GB 36726/46 A GB36726/46 A GB 36726/46A GB 3672646 A GB3672646 A GB 3672646A GB 629619 A GB629619 A GB 629619A
Authority
GB
United Kingdom
Prior art keywords
current
voltage
cathode
exciting current
grid
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
GB36726/46A
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.)
Westinghouse Electric International Co
Original Assignee
Westinghouse Electric International 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 Westinghouse Electric International Co filed Critical Westinghouse Electric International Co
Publication of GB629619A publication Critical patent/GB629619A/en
Expired legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G05—CONTROLLING; REGULATING
    • G05F—SYSTEMS FOR REGULATING ELECTRIC OR MAGNETIC VARIABLES
    • G05F1/00—Automatic systems in which deviations of an electric quantity from one or more predetermined values are detected at the output of the system and fed back to a device within the system to restore the detected quantity to its predetermined value or values, i.e. retroactive systems
    • G05F1/10—Regulating voltage or current
    • G05F1/12—Regulating voltage or current wherein the variable actually regulated by the final control device is ac
    • G05F1/40—Regulating voltage or current wherein the variable actually regulated by the final control device is ac using discharge tubes or semiconductor devices as final control devices
    • G05F1/42—Regulating voltage or current wherein the variable actually regulated by the final control device is ac using discharge tubes or semiconductor devices as final control devices discharge tubes only
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05G—X-RAY TECHNIQUE
    • H05G1/00—X-ray apparatus involving X-ray tubes; Circuits therefor
    • H05G1/08—Electrical details
    • H05G1/26—Measuring, controlling or protecting
    • H05G1/30—Controlling
    • H05G1/34—Anode current, heater current or heater voltage of X-ray tube

Landscapes

  • Engineering & Computer Science (AREA)
  • Health & Medical Sciences (AREA)
  • General Health & Medical Sciences (AREA)
  • Toxicology (AREA)
  • Power Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • General Physics & Mathematics (AREA)
  • Radar, Positioning & Navigation (AREA)
  • Automation & Control Theory (AREA)
  • X-Ray Techniques (AREA)

Abstract

629,619. Automatic control systems for X-ray tubes. WESTINGHOUSE ELECTRIC INTERNATIONAL CO. Dec. 12, 1946, No. 36726. Convention date, Sept. 20, 1945. [Class 38 (iv)] In a control system for stabilizing the exciting current of an X-ray tube, the cathode heating current is varied, by means of a saturable reactor, in correspondence with changes in the exciting current. As shown, the X-ray tube 5, is supplied from the high voltage transformer 9 and rectifiers 7, 13, with D.C. exciting current which passes through the potentiometer network 40 to produce a proportionate D.C. voltage on the grid of valve 37, the anode current of which excites the control winding of the saturable choke 35. The latter is in series with the A.C. heating supply to the tube cathode which is therefore varied in accordance with changes in the exciting current. By control of the screen-grid voltage of tube 37 the X-ray tube filament current is automatically raised at the commencement of an exposure and reduced at its termination. Instability due to feed-back between the filament and the exciting circuit is precluded by the damping transformer 74 which injects a stabilizing voltage into the grid circuit of 37. The control circuit is not operable until after a time delay, i.e. the time taken for the cathode of rectifier 60 to rise in temperature. Reference has been directed by the Comptroller to Specification 636,357.
GB36726/46A 1945-09-20 1946-12-12 Improvements in control systems for x-ray tubes Expired GB629619A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US617625A US2512193A (en) 1945-09-20 1945-09-20 Milliamperage stabilizer

Publications (1)

Publication Number Publication Date
GB629619A true GB629619A (en) 1949-09-23

Family

ID=24474381

Family Applications (1)

Application Number Title Priority Date Filing Date
GB36726/46A Expired GB629619A (en) 1945-09-20 1946-12-12 Improvements in control systems for x-ray tubes

Country Status (2)

Country Link
US (1) US2512193A (en)
GB (1) GB629619A (en)

Families Citing this family (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
NL72521C (en) * 1948-09-30 1953-06-15 Philips Nv device for making X-ray images
US2617045A (en) * 1949-01-08 1952-11-04 Philips Lab Inc Tube current stabilizer
FR997420A (en) * 1949-09-09 1952-01-07 Massiot & Cie G Method and device for controlling the temperature of the anode of an x-ray bulb
US2626360A (en) * 1950-07-12 1953-01-20 Westinghouse Electric Corp Compensator for x-ray systems
US2752509A (en) * 1950-09-02 1956-06-26 F R Machine Works X-ray apparatus and controls
US2667587A (en) * 1950-12-15 1954-01-26 Hartford Nat Bank & Trust Co Protecting device for x-ray apparatus
US2792503A (en) * 1953-09-04 1957-05-14 Westinghouse Electric Corp X-ray protective circuits
US3061729A (en) * 1959-10-12 1962-10-30 Profexray Inc X-ray tube current metering circuit
CA1151314A (en) * 1978-09-15 1983-08-02 Robert R. Lafrance X-ray system signal derivation circuits for heat unit indicators and/or calibration meters
DE2918353A1 (en) * 1979-05-07 1980-11-20 Siemens Ag X-RAY DIAGNOSTIC SYSTEM WITH MEANS FOR THE FIXED DEFINITION OF RECORDING TIME, X-RAY TUBE VOLTAGE AND MAS PRODUCT
US8964940B2 (en) * 2012-11-21 2015-02-24 Thermo Scientific Portable Analytical Instruments Inc. Dynamically adjustable filament control through firmware for miniature x-ray source
US10398011B2 (en) 2015-11-12 2019-08-27 Kimtron, Inc. Method and apparatus for active filament management
US10342107B2 (en) 2015-11-12 2019-07-02 Kimtron, Inc. Cascaded filament transformer within a resistive shroud

Family Cites Families (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1893299A (en) * 1930-12-31 1933-01-03 Westinghouse X Ray Co Inc Discharge tube stabilizer system
US1961703A (en) * 1931-06-30 1934-06-05 Westinghouse X Ray Co Inc Stabilizer system
US1999736A (en) * 1931-07-10 1935-04-30 Westinghouse X Ray Co Inc Discharge device stabilizer system
US2048203A (en) * 1931-08-04 1936-07-21 Raytheon Mfg Co Thermionic gaseous discharge device
US1953889A (en) * 1931-09-23 1934-04-03 Wappler Electric Company Inc Thermionic cathode X-ray stabilizer system
US2001567A (en) * 1933-12-22 1935-05-14 Gen Electric Electric valve translating circuit
US2262044A (en) * 1938-03-02 1941-11-11 La Verne R Philpott Temperature control for magnetron filament
US2236195A (en) * 1938-12-15 1941-03-25 Rca Corp Automatic cathode voltage adjusting device
US2319378A (en) * 1941-10-09 1943-05-18 Westinghouse Electric & Mfg Co Stabilizer system

Also Published As

Publication number Publication date
US2512193A (en) 1950-06-20

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