US3611032A - Electromagnetic induction apparatus for high-voltage power generation - Google Patents
Electromagnetic induction apparatus for high-voltage power generation Download PDFInfo
- Publication number
- US3611032A US3611032A US833436A US3611032DA US3611032A US 3611032 A US3611032 A US 3611032A US 833436 A US833436 A US 833436A US 3611032D A US3611032D A US 3611032DA US 3611032 A US3611032 A US 3611032A
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- Prior art keywords
- voltage
- electrical
- terminal
- induction apparatus
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- 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
- H05G1/10—Power supply arrangements for feeding the X-ray tube
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M5/00—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases
- H02M5/02—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases without intermediate conversion into dc
- H02M5/04—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases without intermediate conversion into dc by static converters
- H02M5/06—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases without intermediate conversion into dc by static converters using impedances
Definitions
- High-voltage power supplies of the type which are the subject of this invention are used, for example, to supply the acceleration voltage to charged particle accelerators used extensively in science and industry. Typical applications of such particle accelerators include nuclear research, industrial radiation processing, X-ray generators and electron microscopes.
- Charged particle accelerators typically comprise a high-voltage power supply connected to an evacuated acceleration tube.
- the source of the charged particles is located at the high-voltage end of the acceleration tube and it requires electrical energy to energize various accessory power supplies associated with the generation and focusing of the charged particle beam.
- Existing techniques for supplying this auxiliary source of electrical energy include the use of isolation transformers with high-voltage insulation between the primary and secondary windings, mechanical couplings such as insulated shafts or belts which turn a generator located in the high-voltage area, and dual-function power supplies of the insulating core transformer, or other inductively coupled types, in which a single unit generates both the high acceleration voltage and the auxiliary source of electrical energy.
- the conventional insulating core transformer has previously had the disadvantage of nonuniformity of the magnetic field particularly as the number of secondary cores increases.
- the magnetic field lines originating in the primary cores begin to take a leakage path rather than through the intended magnetic circuit thereby decreasing the total power output that would otherwise be available if all the magnetic flux could be con trolled.
- lt is, therefore, a general object of the present invention to provide a new and improved electromagnetic induction apparatus.
- Another object of the present invention is to provide a new and improved surge protection system for power supplies of the multiplier type where energy is supplied to a plurality of cascaded voltage generators by an alternating magnetic field.
- Yet another object of the present invention is to increase the power output and the efficiency of the magnetic circuit in electromagnet induction apparatus.
- FIG. 3 is a simplification showing the equivalent circuit of a power supply incorporating this invention in order that its method of operation when subjected to transient voltage surges may better be described.
- Each secondary core 3 is surrounded by a secondary coil 8 in which an alternating voltage is induced due to the alternating magnetic field in the secondary cores 3.
- this alternating voltage is rectified by a voltage doubler circuit 20 consisting of rectifiers 9, current-limiting resistors 10 and capacitors 11.
- the direct current outputs of the voltage doubler circuits 20 are connected in series so that their individual outputs add up to give a high direct voltage which appears across the output terminals 12 and 13. If terminal 12 is at, or near, ground potential then the terminal 13 will be the high-voltage output connection to which the acceleration tube or other high-voltage load is connected.
- An important feature of the insulating core transformer consists of the connection of each secondary core 3 to one end of its associated secondary coil 8 thus ensuring a constant voltage gradient in each sheet of insulation.
- Three additional seconds ry coils 14 provide a source of auxiliary three-phase power at the high DC potential with respect to ground. These three coils are arranged in a Y-connection with the output terminals 15 referenced to the high-voltage DC output 13 as the threephase system neutral connection.
- Capacitors l6, l7 and 18 are associated with a flux-equalizing refinement and their function will be described later.
- Insulating core transformer power supplies of the type described above have been manufactured and operated successfully at output voltages up to 750 kv. DC. Attempts to build such'power supplies for higher voltage ratings have revealed a weakness inherent in most forms of high-voltage power supplies; namely, under conditions in which the externally connected load sparks, the resulting surge gives rise to a nonuniform voltage gradient among the components comprising the power supply. This nonuniformity is caused by various capacities and inductances, both intentional and unintentional between the various components which dictate the transient voltage distribution during the time of the surge. This phenomenon is well known to those skilled in the art and it can be shown by a theoretical analysis that the maximum value of this transient voltage gradient will appear across components at the high-voltage end of the power supply.
- the simple form of three-phase insulating core transformer power supply as just described and shown in FIG. 2 exhibits an effect which is detrimental to its performance if large currents are to be obtained at high-voltage outputs.
- This effect manifests itself by a lower magnetic flux density in those secondary cores furthest away from the primary coils 7.
- the cause of this effect is inherent in the nature of the insulating core principle and is due to the presence of the insulating sheets 4 which introduce gaps of high magnetic reluctance between the secondary cores 3.
- the total magnetic reluctance of each of the three legs of the magnetic circuit becomes comparable with the reluctance between the legs with the consequence that a considerable magnetic leakage path exists between the three legs.
- FIG. 1 which schematically shows an insulating core transformer power supply without surge protection impedance
- the magnetic flux density can be made the same in every secondary core by the addition of capacitors l6, l7 and 18 across each respective transformer coil. These capacitors l6, l7 and 18 will cause a higher current to flow in each respective coil without dissipating any additional power other than an increased resistance loss in each coil and the dissipation loss in each respective capacitor.
- a further feature of the invention enables the surge protection resistors to fulfill their purpose in a more efficient manner.
- This feature may best be understood by reference to FIG. 3 in conjunction with FIG. 2.
- the surge protection impedances, 19 in FIG. 2 shown as two resistors R1 and R2 are each shunted by a capacitor of value Cl and C2 respectively. These capacitors are primarily formed by the capacitance between adjacent secondary cores 3' in FIG. 2.
- Capacitors C3, C4 and C5 are the stray capacitances between the components associated with the surge protection impedances and any neighboring grounded structure such as a containing vessel.
- both R1 and R2 as has been previously explained is to isolate the power supply P from transient voltages generated by the connected load. It can be shown that for maximum effectiveness of RI and R2 in performing their surge protection function, capacitors C, C3, C4 and C5 should be made as large as possible while capacitors Cl and C2 should be made as small as possible.
- the refinement to the basic invention seeks to increase the surge protection ability of R1 and R2 by increasing the capacitances C, C3, C4 and C5 while decreasing the capacitances C1 and C2.
- the insulation sheets 4' shown in FIG. 2 can be made thicker, than the insulation sheets 4 in the voltage-generating part of the power supply.
- the dielectric constants of the materials chosen for the insulation sheets can be different. For example,
- these equipotential rings are electrically connected to cores 3 and 3' so that further increase in capacitors C3, C4 and C5 is possible by using wider equipotential rings in conjunction with larger cores 3'.
- first electrical insulating means for insulating said highvoltage intermediate terminal from said low-voltage terminal
- At least one second electrical winding interposed between said high-voltage output and auxiliary terminal and coupled by said magnetic field
- electrical impedance means connected between said high-voltage output terminal and said high-voltage intermediate terminal for providing surge protection for said high-voltage electrical power portion of said electromagnetic induction apparatus.
- said apparatus further includes means for controlling the electrical field gradient by providing equipotential rings electrically connected to said first and second electrical windings and to said electrical impedance means in a predetermined manner and wherein the rings associated with said second electrical windings and said electrical impedance means have an increased surface area to maximize the capacitance to said low-voltage terminal.
- Insulating core induction apparatus comprising:
- At least one magnetic column included in said magnetic circuit said column comprising a plurality of magnetic core segments electrically insulated one from the other,
- the insulating core induction apparatus as set forth in claim 8 having an auxiliary power source and wherein said apparatus further includes a. a high-voltage intermediate terminal at the same potential as said high-voltage output terminal,
- the insulating core induction apparatus as set forth in claim 10 wherein said apparatus further includes a. flux-equalizing electrical windings surrounding said additional electrically insulated magnetic core segments; and
- the insulating core induction apparatus as set forth in claim 10 wherein the insulation material between said core segments is selected to have a higher dielectric constant than the insulation material between said additional magnetic core segments to maximize the capacitance between the said highvoltage intermediate terminal and said low-voltage terminal.
Abstract
Description
Claims (16)
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US83343669A | 1969-06-16 | 1969-06-16 |
Publications (1)
Publication Number | Publication Date |
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US3611032A true US3611032A (en) | 1971-10-05 |
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Application Number | Title | Priority Date | Filing Date |
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US833436A Expired - Lifetime US3611032A (en) | 1969-06-16 | 1969-06-16 | Electromagnetic induction apparatus for high-voltage power generation |
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US (1) | US3611032A (en) |
Cited By (11)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4750077A (en) * | 1983-03-01 | 1988-06-07 | Mitsubishi Denki Kabushiki Kaisha | Coil device |
US5023768A (en) * | 1989-11-24 | 1991-06-11 | Varian Associates, Inc. | High voltage high power DC power supply |
US5146198A (en) * | 1991-06-28 | 1992-09-08 | Westinghouse Electric Corp. | Segmented core inductor |
WO1992019085A1 (en) * | 1991-04-11 | 1992-10-29 | Varian Associates, Inc. | High voltage dc source |
FR2680939A1 (en) * | 1991-09-03 | 1993-03-05 | Gen Electric Cgr | DEVICE AND HIGH VOLTAGE POWER SUPPLY BLOCK FOR X-RAY TUBE |
US5231564A (en) * | 1992-03-30 | 1993-07-27 | Lorad Corporation | Power supply for producing excitation voltage for an x-ray tube filament |
US5550378A (en) * | 1993-04-05 | 1996-08-27 | Cardiac Mariners, Incorporated | X-ray detector |
US5610967A (en) * | 1993-01-25 | 1997-03-11 | Cardiac Mariners, Incorporated | X-ray grid assembly |
US5682412A (en) * | 1993-04-05 | 1997-10-28 | Cardiac Mariners, Incorporated | X-ray source |
US20080012680A1 (en) * | 2006-07-13 | 2008-01-17 | Double Density Magnetics, Inc. | Devices and methods for redistributing magnetic flux density |
GB2491475A (en) * | 2011-05-31 | 2012-12-05 | Christopher James Macdonald-Bradley | Stacked voltage doublers fed by multiple sources |
Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3187208A (en) * | 1961-11-21 | 1965-06-01 | High Voltage Engineering Corp | High voltage electromagnetic apparatus having an insulating magnetic core |
-
1969
- 1969-06-16 US US833436A patent/US3611032A/en not_active Expired - Lifetime
Patent Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3187208A (en) * | 1961-11-21 | 1965-06-01 | High Voltage Engineering Corp | High voltage electromagnetic apparatus having an insulating magnetic core |
Cited By (23)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4750077A (en) * | 1983-03-01 | 1988-06-07 | Mitsubishi Denki Kabushiki Kaisha | Coil device |
US5023768A (en) * | 1989-11-24 | 1991-06-11 | Varian Associates, Inc. | High voltage high power DC power supply |
WO1992019085A1 (en) * | 1991-04-11 | 1992-10-29 | Varian Associates, Inc. | High voltage dc source |
US5166965A (en) * | 1991-04-11 | 1992-11-24 | Varian Associates, Inc. | High voltage dc source including magnetic flux pole and multiple stacked ac to dc converter stages with planar coils |
US5146198A (en) * | 1991-06-28 | 1992-09-08 | Westinghouse Electric Corp. | Segmented core inductor |
WO1993000692A1 (en) * | 1991-06-28 | 1993-01-07 | Sundstrand Corporation | Segmented core inductor |
FR2680939A1 (en) * | 1991-09-03 | 1993-03-05 | Gen Electric Cgr | DEVICE AND HIGH VOLTAGE POWER SUPPLY BLOCK FOR X-RAY TUBE |
EP0531189A1 (en) * | 1991-09-03 | 1993-03-10 | General Electric Cgr S.A. | Device and high-voltage power supply unit for an x-ray tube |
US5257304A (en) * | 1991-09-03 | 1993-10-26 | General Electric Cgr S.A. | High-voltage power device and power pack for X-ray tube |
US5231564A (en) * | 1992-03-30 | 1993-07-27 | Lorad Corporation | Power supply for producing excitation voltage for an x-ray tube filament |
US5729584A (en) * | 1993-01-25 | 1998-03-17 | Cardiac Mariners, Inc. | Scanning-beam X-ray imaging system |
US5610967A (en) * | 1993-01-25 | 1997-03-11 | Cardiac Mariners, Incorporated | X-ray grid assembly |
US5644612A (en) * | 1993-01-25 | 1997-07-01 | Cardiac Mariners, Inc. | Image reconstruction methods |
US5651047A (en) * | 1993-01-25 | 1997-07-22 | Cardiac Mariners, Incorporated | Maneuverable and locateable catheters |
US5751785A (en) * | 1993-01-25 | 1998-05-12 | Cardiac Mariners, Inc. | Image reconstruction methods |
US5835561A (en) * | 1993-01-25 | 1998-11-10 | Cardiac Mariners, Incorporated | Scanning beam x-ray imaging system |
US5859893A (en) * | 1993-01-25 | 1999-01-12 | Cardiac Mariners, Inc. | X-ray collimation assembly |
US5682412A (en) * | 1993-04-05 | 1997-10-28 | Cardiac Mariners, Incorporated | X-ray source |
US5550378A (en) * | 1993-04-05 | 1996-08-27 | Cardiac Mariners, Incorporated | X-ray detector |
US20080012680A1 (en) * | 2006-07-13 | 2008-01-17 | Double Density Magnetics, Inc. | Devices and methods for redistributing magnetic flux density |
US7864013B2 (en) | 2006-07-13 | 2011-01-04 | Double Density Magnetics Inc. | Devices and methods for redistributing magnetic flux density |
GB2491475A (en) * | 2011-05-31 | 2012-12-05 | Christopher James Macdonald-Bradley | Stacked voltage doublers fed by multiple sources |
GB2491475B (en) * | 2011-05-31 | 2018-03-28 | Christopher James Macdonald Bradley | Voltage cascade using multiple alternating current supplies |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
AS | Assignment |
Owner name: MARINE MIDLAND BANK, N.A. Free format text: SECURITY INTEREST;ASSIGNOR:HIGH VOLTAGE ENGINEERING CORPORATION;REEL/FRAME:005009/0952 Effective date: 19880801 |
|
AS | Assignment |
Owner name: FIRST NATIONAL BANK OF BOSTON Free format text: SECURITY INTEREST;ASSIGNORS:COMFAB TECHNOLOGIES, INC.;HIGH VOLTAGE ENGINEERING CORPORATION;REEL/FRAME:005258/0013;SIGNING DATES FROM |
|
AS | Assignment |
Owner name: FLEET NATIONAL BANK Free format text: SECURITY INTEREST;ASSIGNOR:HIGH VOLTAGE ENGINEERING CORPORATION, A MA CORPORATION;REEL/FRAME:005748/0283 Effective date: 19910607 |
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AS | Assignment |
Owner name: SANWA BUSINESS CREDIT CORPORATION AS COLLATERAL AG Free format text: COLLATERAL ASSIGNMENT OF COPYRIGHTS, PATENTS, TRADEMARKS AND LICENSES;ASSIGNORS:HIGH VOLTAGE ENGINEERING CORPORATION;DATCON INSTRUMENT COMPANY;HALMAR ROBICON GROUP, INC.;AND OTHERS;REEL/FRAME:008013/0660 Effective date: 19960509 |