EP0531189A1 - Vorrichtung und Hochspannungsversorgungseinheit für eine Röntgenröhre - Google Patents

Vorrichtung und Hochspannungsversorgungseinheit für eine Röntgenröhre Download PDF

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Publication number
EP0531189A1
EP0531189A1 EP92402350A EP92402350A EP0531189A1 EP 0531189 A1 EP0531189 A1 EP 0531189A1 EP 92402350 A EP92402350 A EP 92402350A EP 92402350 A EP92402350 A EP 92402350A EP 0531189 A1 EP0531189 A1 EP 0531189A1
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EP
European Patent Office
Prior art keywords
coils
secondary windings
circuit
series
diodes
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.)
Granted
Application number
EP92402350A
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English (en)
French (fr)
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EP0531189B1 (de
Inventor
Jacques Cabinet Ballot-Schmit Sireul
Hans Cabinet Ballot-Schmit Jedlitschka
Dominique Cabinet Ballot-Schmit Poincloux
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.)
General Electric CGR SA
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General Electric CGR SA
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Publication date
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Publication of EP0531189A1 publication Critical patent/EP0531189A1/de
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Publication of EP0531189B1 publication Critical patent/EP0531189B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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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

Definitions

  • the invention relates to electrical devices which are used to power X-ray tubes.
  • An X-ray tube includes a filament type cathode which emits an electron beam towards an anode or anticathode.
  • the anode is made of a material such as tungsten or molybdenum which emits X-rays when it is bombarded by the electron beam from the cathode.
  • the electrons are accelerated by an intense electric field created between the cathode and the anode.
  • the anode is brought to a positive potential of several tens of kilovolts relative to the cathode, this potential being able to exceed one hundred kilovolts and reach one hundred and forty kilovolts.
  • Such voltages are supplied by so-called high voltage supply devices which include, as shown in FIG. 1, a transformer 10 which is connected to voltage rectifier-doubler circuits 11. More specifically, the transformer 10 comprises a single winding primary 12 to which an alternating voltage is applied and a secondary circuit 13 which is connected to the rectifier-doubler voltage circuits 11.
  • Each rectifier-doubler voltage circuit 11 consists, conventionally, in a secondary winding 14, two diodes D1 and D2 and two capacitors C1 and C2 which are connected together according to the diagram in FIG. 1.
  • Each voltage rectifier-doubler circuit is connected to the next so that their voltages output add up, which allows to obtain a very high voltage on the last circuit doubler of assembly.
  • the transformer 10 comprises a primary winding 12 and twelve secondary windings S1, S5, S6 and S12. Similarly, it includes twenty-four identical rectifier diodes D1, D2, D3 ... D12, D13, D14 ... D22, D23, D24. Of course, each diode can be replaced by several diodes in series to take account of the reverse voltage held by the diodes.
  • Each secondary winding S1 to S12 has two output terminals. All the output terminals bear the references B1 to B24, only the terminals B1, B2, B3 ... B5, B6, B7, B8 ... B23, B24 having been shown.
  • the common point of the capacitor C1 and the diode D1 constitutes the high voltage output terminal 46 HT through a resistor R while the common point of the capacitor C24 and the diode D24 constitutes the output terminal mass with which a spark gap is associated 9.
  • the high voltage output terminal 46 is connected to a measuring device (not shown) connected to point M via a resistor R and a variable capacitor C.
  • the point M is connected to ground by a spark gap 8.
  • each rectifier-doubler circuit has an output voltage of six kilovolts so that at the output of the twelfth rectifier-doubler circuit, the voltage is seventy-two kilovolts.
  • X-ray tubes are used more and more in impulse mode according to increasingly higher repetition frequencies.
  • the performance of the circuit of FIG. 1 is limited by the parasitic capacitances and inductors of the conductors and the windings of the transformer, the values of which are difficult to know and to compensate for.
  • the secondary circuit in the form of concentric windings, only the parasitic capacitance between the first secondary winding and the mass has an influence because the other parasitic capacitances between the secondary windings do not intervene because they are at an alternating voltage.
  • the invention described in the aforementioned patent application first provides for making secondary windings whose similar output terminals of odd rank B1, B3 ... B23, are arranged on a first lateral side of the windings while the output terminals of even rank B2, B4 ... B24 are arranged on the other or second lateral side of the secondary windings. It is then planned to group the diodes D1 to D24 on the same support which is arranged on the side of the output terminals B1, B3 ...
  • the high voltage supply device described in the application for The aforementioned patent is placed in an enclosure filled with an insulating cooling fluid and the assembly constitutes what is called a high voltage block.
  • a large volume of coolant from 15 to 20 liters approximately, is necessary, volume which leads to a block quite bulky high voltage.
  • Such a high voltage block in addition to its reduction in volume, has satisfactory electrical characteristics for most current applications and thus makes it possible to reach high voltages greater than one hundred kilovolts.
  • the magnetic circuits which can be used are of the type resulting from the combination of a first circuit in the form of the letter C or in the form of a horseshoe and a second circuit in the form of the letter I which closes the first circuit.
  • the maximum area of the window for passage of such magnetic circuits is limited, which limits the area available for the windings.
  • the secondary circuits are connected so as to apply a positive high voltage on the anode and a negative high voltage on the cathode, of the order of 75 kilovolts each, it is difficult, if not impossible, to obtain symmetry perfect between the two high voltages. Indeed, as the midpoint corresponds to one of the secondary windings, the negative high voltage will correspond, for example to windings close to the magnetic circuit while the positive high voltage will correspond to windings distant from the magnetic circuit. From this arrangement, it follows that the windings of the high positive voltage are subjected to a weaker magnetic flux than those of the high negative voltage.
  • this asymmetry can be corrected by providing for a smaller number of turns for the windings of the high negative voltage (internal layers) than for the windings of the high positive voltage (external layers). Such corrections complicate the production of such a high voltage block with symmetrical high voltages without achieving perfect symmetry.
  • An object of the present invention is therefore to produce a high voltage device and, more particularly a high voltage block, which can provide at least double power compared to the devices and blocks described in the aforementioned patent applications.
  • Another object of the present invention is to provide a high voltage block which can provide perfectly symmetrical high voltages.
  • Figure 1 is the conventional electrical diagram of a high voltage supply device for an X-ray tube will not be described again but is an integral part of the description of the invention. Indeed, according to the purely functional aspect of the invention, it consists in producing two secondary circuits identical each to that of the electrical diagram of FIG. 1 and in magnetically coupling their windings to a primary circuit by means of a magnetic circuit.
  • the elements of a first secondary circuit will be referenced by those of FIG. 1 while the identical elements of the second secondary circuit will be referenced by "premium" references as indicated by the references in parentheses.
  • the different mechanical elements for supporting and maintaining the different components of the two secondary circuits and of the circuit primary as well as their electrical connections between them will be described in relation to FIGS. 2 to 6.
  • the central element consists of two cylinders 20 and 22 which are hollow and concentric and are held integral with one another by a central partition 24.
  • Two primary windings 12 and 12 ′ are placed at the internal periphery of the hollow cylinder 20, the space interior remained free being occupied by the internal branch of a magnetic circuit 26.
  • the magnetic circuit 26 is made by two identical elementary magnetic circuits 28 and 28 ′ in the shape of letter C or horseshoe which are joined by their opening.
  • the two cylinders 20 and 22 define therebetween, on either side of the central partition 24, an annular compartment 30 and 30 ′ which serves as a housing for support elements of each secondary circuit.
  • the secondary windings S1 to S12 (or S′1 to S′12) are wound on an annular mandrel 32 (or 32 ′) closed by a cylindrical cover 34 (or 34 ′). This mandrel 32 (or 32 ′) fits onto the outer periphery of the cylinder 20 in the annular compartment 30 (or 30 ′).
  • the capacitors C1 to C24 are arranged in cells such as those referenced 35 (or 35 ′) which are, for example, produced by the assembly of two annular compartments 36, 38 (or 36 ′, 38 ′) which each have housings in the form of capacitors C1 to C24 (or C′1 to C′24).
  • the annular compartment 38 (or 38 ′), furthest from the central partition 24, is held in assembly by any known means and, in particular, by a cover 40 (or 40 ′) in the form of a ring which fits onto the external periphery of the honeycomb compartments 36, 38 (or 36 ′, 38 ′).
  • annular space 42 (42 ′) is left free between, on the one hand, the bottom of the cover 40 (or 40 ′) and, on the other hand, and the mandrel 32 (or 32 ′) and the honeycomb compartment 38 (or 38 ′), for fitting the rectifying diodes D1 to D24 (or D′1 to D′24).
  • These diodes are fixed to a printed circuit 44 (or 44 ′) in the form of an annular sector (FIG. 4) which is secured, for example, to the honeycomb compartment 38 (or 38 ′).
  • This printed circuit 44 makes the connections of the diodes D1 to D24 (or D′1 to D′24) between them, with one of the terminals of the capacitors C1 to C24 (or C′1 to C′24) and with the odd rank output terminals B1, B3 ... B23 (or B′1, B′3 ... B′23) in accordance with the electrical diagram in Figure 1.
  • the diode D1 (or D′1) has its cathode which is connected to the terminal B1 (or B′1) of the winding S1 (or S ′ 1) and its anode which is connected to one of the terminals of the capacitor C1 (or C′1). Furthermore, the terminal B1 (or B′1) is connected to the diode D2 (or D′2) whose cathode is connected, on the one hand, to the anode of the diode D3 (or D′3) and , on the other hand, to a terminal of capacitors C2 and C3 (or C′2 and C′3), and to the latter by a printed conductor CI1 (or CI′1).
  • connection conductors CC5 to CC10 (or CC′5 to CC′10) have been shown between the terminals B6, B8 and B10 (or B′6, B′8 and B′10) and the associated capacitors C5 and C6 (or C′5 and C′6), C7 and C8 (or C′7 and C′8) and C9, C10 (or C′9, C′10).
  • these conductors CC5 to CC10 can be produced in the form of conductors of a printed circuit analogous to the printed circuit 44 (or 44 ′) carrying the diodes or in the form of bars.
  • the high voltage which is supplied by each secondary circuit is taken from a terminal 461 (or 46′1) of the printed circuit 44 (or 44 ′).
  • each half-shell 58, 58 ′ is shaped in substantially the same way to serve as a mounting support for a certain number of elements.
  • each half-shell 58 (or 58 ′) respectively has a bottom wall 83 (or 83 ′) and side walls 84 or 84 ′), 85 (or 85 ′), 86 (or 86 ′), 87 (or 87 ′).
  • Each bottom wall has a hollow central cylinder (hole 88 (or 88 ′) which passes through each half-shell 58 (or 58 ′) and abuts on one edge of the cylinder 20 during assembly by means of a seal (not shown).
  • Each half-shell 58 (or 58 ′) has an L-shaped notch 90 (or 90 ′) whose vertical arm is located on the bottom wall 83 (or 83 ′) while the horizontal arm is located on the wall lateral 87 (or 87 ′).
  • the vertical arm notch has a depth less than that of the thickness of the half-shell and the notch of the horizontal arm has a depth less than the distance from the hollow cylinder to the side wall 87 (or 87 ′).
  • the intermediate element 50 also has a notch 56 facing the notches 90 and 90 ′.
  • These different notches 90, 90 ′ and 56 serve to house one of the longitudinal branches of the magnetic circuit 26, the other branch being housed in the hollow cylinders 88, 88 ′ and inside the cylinder 20 of the intermediate element 50.
  • each half-shell comprises cells to allow the establishment and maintenance of the elements of the secondary circuit as well as other elements which will be indicated below.
  • a first cell 91 (or 91 ′) is provided around the hollow cylinder 88 (or 88 ′) for the support and the maintenance of the secondary windings SI to S12 (or S′1 to S′12) arranged in the mandrel 32 (or 32 ′) and capacitors C1 to C24 (or C′1 to C′24) arranged in the honeycomb compartments 36, 38 (or 36 ′, 38 ′).
  • the cell 91 (or 91 ′) is sufficiently deep for housing the printed circuit 44 (or 44 ′) on which the diodes D1 to D24 (or D′1 to D′24) are fixed.
  • a second cell 92 (or 92 ′) is produced in the half-shell 58 (or 58 ′) to put in place a high voltage output connector 93 (or 93 ′) one of the terminals of which is connected to the high terminal tension 46 (or 46 ′) ( Figure 1).
  • Each connector 93 (or 93 ′) is conventionally produced by a sleeve, one closed end of which carries the connection pads located in the cell 92 (or 92 ′) near the high voltage output terminal 46 (or 46 ′ ).
  • the other end of the connector sleeve is open and serves as a passage for the output conductors by means of a male connector, not shown, and mounted hermetically in an opening in the side wall 85 (or 85 ′) using 'a gasket and a plate (not shown) screwed to the side wall.
  • a fourth cell 96 arranged for example in the half-shell 58, allows the establishment of a vase 97 filled with air to absorb the expansions of the insulating and cooling medium.
  • the interior of this expansion vessel communicates with the exterior of the vessel through a conduit 98.
  • a fifth cell 96 ′ arranged in the half-shell 58 ′, allows the installation of an electric circuit 99 for measuring voltage.
  • This electrical circuit consists, as indicated in relation to FIG. 1, of a resistor R and of a variable capacitor C in parallel and of a spark gap 9.
  • a sixth cell 100 in the shell 58 is provided to set up and maintain a first transformer 101 to supply a first filament to the cathode of the tube.
  • a seventh cell 100 ′ in the half-shell 58 ′ is provided to set up and maintain a transformer 101 ′ to supply a second filament to the cathode of the tube.
  • the different cells which have just been described are separated by walls, such as that referenced 102 (or 102 ′), whose shapes match those of the elements which they must maintain. These walls are pierced with orifices such as that referenced 103 ′ in the wall 102 ′ to allow the flow of the insulating and cooling liquid.
  • two orifices 104 and 104 ′ are provided, drilled respectively in the side walls 85 and 85 ′ and provided respectively with caps 105 and 105 ′.
  • inlet and outlet orifices can be provided in the case where circulation of the insulating and cooling medium is provided.
  • the latter After mounting and wiring of the various elements of the secondary circuits in the half-shells 58 and 58 ′ and the intermediate element 50, the latter is assembled with the half-shells so as to produce a sealed tank on which are mounted inside the different elements of the primary circuit and the magnetic circuit.
  • the primary winding (s) 12 and 12 ′ are arranged inside the cylinder 20 and the hollow cylinders of the half-shells 58 and 58 ′ while the horizontal internal branches of the magnetic half-circuits 28 and 28 ′ pass through the cylinder 20 and the hollow cylinders 88 and 88 ′ inside the primary winding (s) 12 or 12 ′ so as to abut one against the other along line 43 on their opposite faces.
  • the horizontal external branches of the magnetic circuits are housed in the notches 90, 90 ′ and 56.
  • the vertical branches of the magnetic circuits are housed in the vertical parts of the notches 90 and 90 ′.
  • means are provided for those skilled in the art, such as plates which are applied to the vertical branches of the magnetic circuit and which are fixed on the half-shells 58 and 58 ′. These plates can also serve as a support for a fan (not shown) to cool the primary winding and the magnetic circuit by carrying out a forced and rapid flow of air inside the hollow cylinders 88 and 88 ′ and of the cylinder 20 .
  • the half-shells 58, 58 ′ and the intermediate element 50 are made of an insulating material such as a plastic.
  • the outer wall of the elements 58, 58 ′ and 50 is coated with a metal envelope or with a conductive layer which is produced so as not to short-circuit the secondary windings.
  • the metallic envelope or the conductive layer is connected to ground.
  • These two secondary circuits can be connected in parallel or in series. In a parallel connection, the number of turns of each winding can be distributed over the two coils, which allows the section of the conductive wire to be increased and therefore the power to be increased.
  • one secondary circuit is assigned to produce the positive voltage while the other secondary circuit is assigned to produce the negative voltage, which doubles the current voltage constant.
  • the intrinsic dielectric rigidity of the assembly is equal to that of a single secondary circuit, due to the independence of each of the secondary circuits. Consequently, seen from the outside, the output voltage can be doubled without affecting the margins on the voltage withstand.
  • the device of the invention makes it possible to obtain high voltages perfectly equal at the terminals of each secondary circuit and therefore perfectly symmetrical high voltages in the case of the series connection of the secondary circuits.

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  • X-Ray Techniques (AREA)
  • Rectifiers (AREA)
  • Coils Or Transformers For Communication (AREA)
EP92402350A 1991-09-03 1992-08-27 Vorrichtung und Hochspannungsversorgungseinheit für eine Röntgenröhre Expired - Lifetime EP0531189B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR9110888 1991-09-03
FR9110888A FR2680939B1 (fr) 1991-09-03 1991-09-03 Dispositif et bloc d'alimentation haute tension pour tube a rayons x.

Publications (2)

Publication Number Publication Date
EP0531189A1 true EP0531189A1 (de) 1993-03-10
EP0531189B1 EP0531189B1 (de) 1995-03-29

Family

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Family Applications (1)

Application Number Title Priority Date Filing Date
EP92402350A Expired - Lifetime EP0531189B1 (de) 1991-09-03 1992-08-27 Vorrichtung und Hochspannungsversorgungseinheit für eine Röntgenröhre

Country Status (5)

Country Link
US (1) US5257304A (de)
EP (1) EP0531189B1 (de)
JP (1) JPH05251196A (de)
DE (1) DE69201842T2 (de)
FR (1) FR2680939B1 (de)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2002056648A1 (es) * 2001-01-10 2002-07-18 Sociedad Española De Electromedicina Y Calidad, S.A. Transformador de alta tensión

Families Citing this family (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2700657B1 (fr) * 1993-01-15 1995-02-17 Gen Electric Cgr Ensemble radiogène.
EP0847249A4 (de) * 1995-08-24 2004-09-29 Medtronic Ave Inc Röntgenstrahlen-katheter
DE19538488C1 (de) * 1995-10-16 1996-11-28 Siemens Ag Transformator für eine Gleichrichterschaltung
DE102007032808A1 (de) * 2007-07-13 2009-01-15 Siemens Ag Potenzialsteuerung bei Hochspannungsvorrichtungen
US7577235B2 (en) * 2008-01-09 2009-08-18 General Electric Company Voltage generator of a radiation generator
SG11201508658YA (en) * 2014-01-28 2015-11-27 Española De Electromedicina Y Calidad S A Soc High-voltage, high-frequency, high-power transformer
DE102015213810B4 (de) * 2015-07-22 2021-11-25 Siemens Healthcare Gmbh Hochspannungszuführung für einen Röntgenstrahler
CN111326318B (zh) * 2020-02-26 2021-08-24 广州地铁设计研究院股份有限公司 一种牵引整流干式变压器、变压器系统及其控制方法

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3541424A (en) * 1969-05-19 1970-11-17 Sumitomo Electric Industries High voltage generating device
US3611032A (en) * 1969-06-16 1971-10-05 High Voltage Engineering Corp Electromagnetic induction apparatus for high-voltage power generation
US4338657A (en) * 1974-05-21 1982-07-06 Lisin Vladimir N High-voltage transformer-rectifier device
EP0116996A2 (de) * 1983-02-18 1984-08-29 Koninklijke Philips Electronics N.V. Hochspannungsstromversorgung
WO1986006892A1 (en) * 1985-05-03 1986-11-20 Budapesti Mu^"Szaki Egyetem Circuit for producing a high direct voltage from a medium frequency alternating voltage
EP0430755A1 (de) * 1989-11-24 1991-06-05 General Electric Cgr S.A. Hochspannungsanlage für Röntgenröhre mit in Sekundärkreis integriertem Kühlbehälter

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JPS6081813A (ja) * 1983-10-12 1985-05-09 Toshiba Corp 高圧トランス
FR2643534B1 (fr) * 1989-02-02 1993-09-17 Gen Electric Cgr Dispositif d'alimentation haute tension pour tube a rayons x
DE3929888A1 (de) * 1989-09-08 1991-03-14 Philips Patentverwaltung Roentgengenerator zum betrieb einer roentgenroehre mit an masse angeschlossenen roehrenteilen
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

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3541424A (en) * 1969-05-19 1970-11-17 Sumitomo Electric Industries High voltage generating device
US3611032A (en) * 1969-06-16 1971-10-05 High Voltage Engineering Corp Electromagnetic induction apparatus for high-voltage power generation
US4338657A (en) * 1974-05-21 1982-07-06 Lisin Vladimir N High-voltage transformer-rectifier device
EP0116996A2 (de) * 1983-02-18 1984-08-29 Koninklijke Philips Electronics N.V. Hochspannungsstromversorgung
WO1986006892A1 (en) * 1985-05-03 1986-11-20 Budapesti Mu^"Szaki Egyetem Circuit for producing a high direct voltage from a medium frequency alternating voltage
EP0430755A1 (de) * 1989-11-24 1991-06-05 General Electric Cgr S.A. Hochspannungsanlage für Röntgenröhre mit in Sekundärkreis integriertem Kühlbehälter

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2002056648A1 (es) * 2001-01-10 2002-07-18 Sociedad Española De Electromedicina Y Calidad, S.A. Transformador de alta tensión
ES2172458A1 (es) * 2001-01-10 2002-09-16 Es De Electromedicina Y Calida Transformador de alta tension.
US6836534B2 (en) 2001-01-10 2004-12-28 Sociedad Espanola De Electromedicina Y Calidad, S.A. High voltage transformer

Also Published As

Publication number Publication date
EP0531189B1 (de) 1995-03-29
FR2680939B1 (fr) 1993-11-26
US5257304A (en) 1993-10-26
JPH05251196A (ja) 1993-09-28
DE69201842T2 (de) 1995-07-27
FR2680939A1 (fr) 1993-03-05
DE69201842D1 (de) 1995-05-04

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