IE32338B1 - Improvements in or relating to the regulation of electron guns - Google Patents
Improvements in or relating to the regulation of electron gunsInfo
- Publication number
- IE32338B1 IE32338B1 IE52168A IE52168A IE32338B1 IE 32338 B1 IE32338 B1 IE 32338B1 IE 52168 A IE52168 A IE 52168A IE 52168 A IE52168 A IE 52168A IE 32338 B1 IE32338 B1 IE 32338B1
- Authority
- IE
- Ireland
- Prior art keywords
- current
- switching circuit
- circuit
- arc
- operating
- Prior art date
Links
Classifications
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H1/00—Details of emergency protective circuit arrangements
- H02H1/0007—Details of emergency protective circuit arrangements concerning the detecting means
- H02H1/0015—Using arc detectors
-
- 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
- G05F1/32—Regulating voltage or current wherein the variable actually regulated by the final control device is ac using magnetic devices having a controllable degree of saturation as final control devices
-
- 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
- G05F1/46—Regulating voltage or current wherein the variable actually regulated by the final control device is dc
- G05F1/52—Regulating voltage or current wherein the variable actually regulated by the final control device is dc using discharge tubes in series with the load as final control devices
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
- H01J37/00—Discharge tubes with provision for introducing objects or material to be exposed to the discharge, e.g. for the purpose of examination or processing thereof
- H01J37/02—Details
- H01J37/24—Circuit arrangements not adapted to a particular application of the tube and not otherwise provided for
- H01J37/241—High voltage power supply or regulation circuits
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
Landscapes
- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- General Physics & Mathematics (AREA)
- Radar, Positioning & Navigation (AREA)
- Automation & Control Theory (AREA)
- Power Engineering (AREA)
- Chemical & Material Sciences (AREA)
- Analytical Chemistry (AREA)
- Discharge Heating (AREA)
- Lasers (AREA)
- Furnace Details (AREA)
- Electron Sources, Ion Sources (AREA)
Abstract
1,202,811. 811. Automatic control systems for electron beam furnaces. AIR REDUCTION CO. Inc. April 25, 1968 [May 3, 1967], No.19543/68. Heading G3R. [Also in Division H2] An electron beam furnace is provided with a regulated power supply which includes a protective circuit responsive to arcing in the furnace as evidenced by a rapid rise in operating current to a trigger level, the protective circuit operating firstly to reduce the current to a level sufficient to starve the arc within a period of time which is preferably within 15 milliseconds from the time the current reaches the trigger level and subsequently automatically to restore the current. As shown, an electron beam furnace 14 is supplied from a D.C. source 28 by way of a resistor 46, a series valve 16 and a transductor 122. The normal operating current, as sensed by the transductor 122, is maintained at a desired value by a control system 26 which operates in known manner to regulate the heating current supplied to the filament of the electron gun 12. The operating voltage is maintained constant by controlling the bias applied to the grid 20 of the valve 16 in dependence upon an error signal derived from a control circuit including a voltage sensing network 18, an isolating transformer 94 associated with converters 90, 98, a voltage regulator 102 which may be of the series transistor type, and a normally closed switching circuit 22. Thus in normal operating conditions both the voltage and current supplied to the furnace are controlled at desired values, but when arcing occurs the operating current rises rapidly; this condition is detected by a sensor 24 which is connected across the series resistor 46 and which produces one output for application to the switching circuit 22 and another output for application to a restart circuit 114. When the rising current reaches a predetermined trigger level the switching circuit 22 opens to render the valve 16 much less conductive, whereby, within 15 milliseconds, the current is reduced to a level sufficient to starve the arc; subsequently, and after a predetermined period, e.g. less than 10 milliseconds, a signal from the restart circuit 114 closes the switching circuit 22 and the operating current is restored. Should the arc still persist the switching circuit 22 is again opened and the cycle repeats until the arc is extinguished. Suitable arrangements, including transistors and thyristors, for the circuits 22, 24 and 114 are described with reference to Fig. 2 (not shown).
[GB1202811A]
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US64262667A | 1967-05-03 | 1967-05-03 |
Publications (2)
Publication Number | Publication Date |
---|---|
IE32338L IE32338L (en) | 1968-11-03 |
IE32338B1 true IE32338B1 (en) | 1973-06-27 |
Family
ID=24577354
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
IE52168A IE32338B1 (en) | 1967-05-03 | 1968-05-03 | Improvements in or relating to the regulation of electron guns |
Country Status (9)
Country | Link |
---|---|
BE (1) | BE714599A (en) |
DE (2) | DE1765346A1 (en) |
ES (1) | ES353497A1 (en) |
FR (1) | FR1561775A (en) |
GB (1) | GB1202811A (en) |
IE (1) | IE32338B1 (en) |
LU (1) | LU56010A1 (en) |
NL (1) | NL6806344A (en) |
SE (1) | SE366629B (en) |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE2918426A1 (en) * | 1979-05-08 | 1980-11-20 | Leybold Heraeus Gmbh & Co Kg | HIGH VOLTAGE SUPPLY DEVICE FOR POWER ELECTRON BEAMS |
-
0
- DE DENDAT1765345 patent/DE1765345A1/de active Pending
-
1968
- 1968-04-25 GB GB1954368A patent/GB1202811A/en not_active Expired
- 1968-05-02 SE SE592568A patent/SE366629B/xx unknown
- 1968-05-02 LU LU56010D patent/LU56010A1/xx unknown
- 1968-05-02 FR FR1561775D patent/FR1561775A/fr not_active Expired
- 1968-05-03 ES ES353497A patent/ES353497A1/en not_active Expired
- 1968-05-03 BE BE714599D patent/BE714599A/xx unknown
- 1968-05-03 IE IE52168A patent/IE32338B1/en unknown
- 1968-05-03 DE DE19681765346 patent/DE1765346A1/en active Pending
- 1968-05-03 NL NL6806344A patent/NL6806344A/xx unknown
Also Published As
Publication number | Publication date |
---|---|
ES353497A1 (en) | 1969-10-01 |
DE1765346A1 (en) | 1971-07-22 |
SE366629B (en) | 1974-04-29 |
IE32338L (en) | 1968-11-03 |
LU56010A1 (en) | 1968-09-03 |
DE1765345A1 (en) | |
GB1202811A (en) | 1970-08-19 |
BE714599A (en) | 1968-09-30 |
NL6806344A (en) | 1968-11-04 |
FR1561775A (en) | 1969-03-28 |
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