EP0267568A2 - Circuit comportant une résistance de protection pour limiter le courant dans un générateur de rayons X - Google Patents

Circuit comportant une résistance de protection pour limiter le courant dans un générateur de rayons X Download PDF

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Publication number
EP0267568A2
EP0267568A2 EP87116532A EP87116532A EP0267568A2 EP 0267568 A2 EP0267568 A2 EP 0267568A2 EP 87116532 A EP87116532 A EP 87116532A EP 87116532 A EP87116532 A EP 87116532A EP 0267568 A2 EP0267568 A2 EP 0267568A2
Authority
EP
European Patent Office
Prior art keywords
protective resistor
circuit arrangement
arrangement according
ray
voltage
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
EP87116532A
Other languages
German (de)
English (en)
Other versions
EP0267568B1 (fr
EP0267568A3 (en
Inventor
Bruno Mook
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.)
Bruker AXS Analytical X Ray Systems GmbH
Original Assignee
Siemens AG
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 Siemens AG filed Critical Siemens AG
Publication of EP0267568A2 publication Critical patent/EP0267568A2/fr
Publication of EP0267568A3 publication Critical patent/EP0267568A3/de
Application granted granted Critical
Publication of EP0267568B1 publication Critical patent/EP0267568B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • 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
    • H05G1/54—Protecting or lifetime prediction
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05G—X-RAY TECHNIQUE
    • H05G1/00—X-ray apparatus involving X-ray tubes; Circuits therefor
    • H05G1/02—Constructional details
    • H05G1/04—Mounting the X-ray tube within a closed housing
    • H05G1/06—X-ray tube and at least part of the power supply apparatus being mounted within the same housing
    • 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

Definitions

  • the invention relates to a circuit arrangement with a protective resistor for current limitation in X-ray emitters which are connected to a high-voltage generator via a high-voltage cable.
  • the X-ray tube is the X-ray tube arranged in a housing and provided with the connections necessary for operation for the electrical and the coolant supply.
  • Protective resistors of this type which are usually located together with the high-voltage generator and other switching and control devices in an apparatus called an X-ray generator, are required in order to limit the short-circuit current occurring in the event of a flashover in the tube.
  • the energy stored in the charging capacitor of the high-voltage generator would appear fully on the tube without a protective resistor, and this could be destroyed at the first flashover or contaminated spectrally by eruption-like melting at the anode.
  • the solution to the problem is seen in a circuit arrangement of the type mentioned in the introduction, in which the protective resistor is arranged on or in the X-ray emitter. This also limits the current resulting from the energy stored in the cable capacity in the event of a short circuit, which enables safe operation with increased high voltage and an associated increase in the limit power of the X-ray emitter.
  • the protective resistor can be a purely ohmic resistor or a low-capacitance, complex resistor in the form of an RL element.
  • the values of R and L are expediently chosen so that the aperiodic limit case is observed.
  • the inductor is constructed from a plurality of inductors connected in series, preferably in the form of disk windings.
  • the partial inductors can also have different frequency ranges with ferrite cores, so that the total inductance is effective over a wide frequency range.
  • the protective resistor is preferably installed in the radiator-side cable end connector or plug of the high-voltage cable, so that changes to already operated X-ray radiators are not necessary.
  • the protective resistor inside the emitter can be connected in series with the anode of the X-ray tube which is at high voltage and can be cooled with it. This allows a particularly high-resistance and thus space-saving design of the protective resistor.
  • electrical isolation for example in the form of an isolating transformer, must be provided in the radiator-side cable connection. This can also be designed as a heating transformer for tube heating.
  • FIGS. 1 and 2 exemplary embodiments of the circuit arrangement according to the invention are shown schematically in FIGS. 1 and 2.
  • FIG. 1 shows an X-ray emitter RS, in the housing G of which the actual X-ray tube RR of the end window type is arranged.
  • the high voltage of the order of magnitude between 20 and 100 kV required for the operation of the X-ray emitter RS is generated in the high-voltage generator HE and fed to the X-ray emitter RS via a high-voltage cable HK of up to 10 m in length.
  • a high-voltage cable HK of up to 10 m in length.
  • a radiator-side cable end connector or plug HV is used to connect the high-voltage cable HK and is inserted into the high-voltage socket HB of the X-ray emitter RS.
  • a protective resistor S is connected inside the X-ray emitter RS in series with the high-voltage-fed anode A and in its cooling water circuit. This makes it possible to design the protective resistor S with high resistance and thus to save space.
  • Another circuit option is to divide the protective resistor into two partial resistors, a protective resistor S ⁇ being arranged in the high-voltage generator HE as usual and the other part S in the X-ray emitter as shown.
  • the protective resistor located in the X-ray emitter RS can then be designed such that it mainly limits the discharge current surge of the cable capacitance C.
  • FIG. 2 shows an embodiment with a so-called side window tube RR in the X-ray emitter RS with a grounded and cooled anode A and a heated and high-voltage cathode K.
  • the high voltage generated in the high voltage generator HE is here also supplied via the high voltage cable HK with distributed cable capacity C to the high voltage socket HB of the X-ray emitter RS.
  • the heating current supply of the directly heated cathode K takes place via two high-voltage conductors of the high-voltage cable HK.
  • the heating circuit is very low-ohmic, approx. 1 to 3 ohms, so that a high-ohmic protective resistor cannot be arranged directly in the X-ray emitter RS.
  • the protective resistor S is installed in the radiator-side end connection HV of the high-voltage cable HK, together with an isolating transformer TT for electrical isolation.
  • the isolating transformer TT is designed as a heating transformer HT. If you choose the operating frequency of the heating transformer HT in the order of magnitude between 100 and 300 kHz, it can be built so small that it must be accommodated in the cable end connection HV together with the protective resistor S. In this embodiment too, the protective resistor S can be divided into two partial resistors S and S ⁇ , as already described for FIG.

Landscapes

  • Health & Medical Sciences (AREA)
  • General Health & Medical Sciences (AREA)
  • Toxicology (AREA)
  • X-Ray Techniques (AREA)
EP87116532A 1986-11-14 1987-11-09 Circuit comportant une résistance de protection pour limiter le courant dans un générateur de rayons X Expired - Lifetime EP0267568B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3639088 1986-11-14
DE19863639088 DE3639088A1 (de) 1986-11-14 1986-11-14 Schaltungsanordnung mit einem schutzwiderstand zur strombegrenzung bei roentgenstrahlern

Publications (3)

Publication Number Publication Date
EP0267568A2 true EP0267568A2 (fr) 1988-05-18
EP0267568A3 EP0267568A3 (en) 1989-12-06
EP0267568B1 EP0267568B1 (fr) 1994-02-09

Family

ID=6314029

Family Applications (1)

Application Number Title Priority Date Filing Date
EP87116532A Expired - Lifetime EP0267568B1 (fr) 1986-11-14 1987-11-09 Circuit comportant une résistance de protection pour limiter le courant dans un générateur de rayons X

Country Status (2)

Country Link
EP (1) EP0267568B1 (fr)
DE (2) DE3639088A1 (fr)

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4972459A (en) * 1988-06-06 1990-11-20 Siemens Aktiengesellschaft Arc-preventing high voltage cable for an x-radiator
EP0416696A2 (fr) * 1989-09-05 1991-03-13 Philips Patentverwaltung GmbH Dispositif radiologique
EP0421720A2 (fr) * 1989-10-05 1991-04-10 General Electric Company Suppression de transitoires dans des câbles
WO1992010921A1 (fr) * 1990-12-06 1992-06-25 Maxwell Laboratories, Inc. Resistance de protection haute tension
EP0497517A1 (fr) * 1991-01-30 1992-08-05 General Electric Company Méthode de purification d'un tube à vide pour le rayonnement des rayons X
EP0515198A1 (fr) * 1991-05-22 1992-11-25 General Electric Company Boîtier avec un revêtement résistif pour blindage de hautes fréquences électromagnétiques
US5229743A (en) * 1990-12-06 1993-07-20 Maxwell Laboratories, Inc. High voltage protection resistor
EP0592164A1 (fr) * 1992-10-06 1994-04-13 Picker International, Inc. Alimentations de puissance

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE393871C (de) * 1921-08-09 1924-04-16 C H F Mueller Spezialfabrik Fu Einrichtung zur Daempfung von UEberspannungswellen in Roentgenanlagen mit in die Zufuehrungsleitung eingeschalteten Widerstaenden
DE610555C (de) * 1933-01-24 1935-03-14 Siemens Reiniger Werke Akt Ges Hochspannungskabel enthaltende Einrichtung zum Betrieb von Entladungsroehren
DE1809583A1 (de) * 1968-04-22 1969-11-06 Dunlee Corp Schutzschaltung bei der Energieversorgung einer Roentgenstrahlroehre
US3683191A (en) * 1970-05-18 1972-08-08 Machlett Lab Inc Modulator system
GB2100960A (en) * 1981-06-12 1983-01-06 Thomson Csf X-ray tube cathode multiple polarization device and a radiation source incorporating such a device
EP0198741A1 (fr) * 1985-03-22 1986-10-22 General Electric Cgr S.A. Ensemble générateur haute tension et dispositif radiogène

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE393871C (de) * 1921-08-09 1924-04-16 C H F Mueller Spezialfabrik Fu Einrichtung zur Daempfung von UEberspannungswellen in Roentgenanlagen mit in die Zufuehrungsleitung eingeschalteten Widerstaenden
DE610555C (de) * 1933-01-24 1935-03-14 Siemens Reiniger Werke Akt Ges Hochspannungskabel enthaltende Einrichtung zum Betrieb von Entladungsroehren
DE1809583A1 (de) * 1968-04-22 1969-11-06 Dunlee Corp Schutzschaltung bei der Energieversorgung einer Roentgenstrahlroehre
US3683191A (en) * 1970-05-18 1972-08-08 Machlett Lab Inc Modulator system
GB2100960A (en) * 1981-06-12 1983-01-06 Thomson Csf X-ray tube cathode multiple polarization device and a radiation source incorporating such a device
EP0198741A1 (fr) * 1985-03-22 1986-10-22 General Electric Cgr S.A. Ensemble générateur haute tension et dispositif radiogène

Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4972459A (en) * 1988-06-06 1990-11-20 Siemens Aktiengesellschaft Arc-preventing high voltage cable for an x-radiator
EP0416696A2 (fr) * 1989-09-05 1991-03-13 Philips Patentverwaltung GmbH Dispositif radiologique
EP0416696A3 (en) * 1989-09-05 1991-08-14 Philips Patentverwaltung Gmbh X-ray apparatus
EP0421720A2 (fr) * 1989-10-05 1991-04-10 General Electric Company Suppression de transitoires dans des câbles
EP0421720A3 (en) * 1989-10-05 1991-10-16 General Electric Company Transient suppression in cables
WO1992010921A1 (fr) * 1990-12-06 1992-06-25 Maxwell Laboratories, Inc. Resistance de protection haute tension
US5229743A (en) * 1990-12-06 1993-07-20 Maxwell Laboratories, Inc. High voltage protection resistor
EP0497517A1 (fr) * 1991-01-30 1992-08-05 General Electric Company Méthode de purification d'un tube à vide pour le rayonnement des rayons X
EP0515198A1 (fr) * 1991-05-22 1992-11-25 General Electric Company Boîtier avec un revêtement résistif pour blindage de hautes fréquences électromagnétiques
EP0592164A1 (fr) * 1992-10-06 1994-04-13 Picker International, Inc. Alimentations de puissance
US5347571A (en) * 1992-10-06 1994-09-13 Picker International, Inc. X-ray tube arc suppressor

Also Published As

Publication number Publication date
DE3639088A1 (de) 1988-05-26
EP0267568B1 (fr) 1994-02-09
DE3789047D1 (de) 1994-03-24
EP0267568A3 (en) 1989-12-06

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