EP0416696A2 - Dispositif radiologique - Google Patents

Dispositif radiologique Download PDF

Info

Publication number
EP0416696A2
EP0416696A2 EP90202331A EP90202331A EP0416696A2 EP 0416696 A2 EP0416696 A2 EP 0416696A2 EP 90202331 A EP90202331 A EP 90202331A EP 90202331 A EP90202331 A EP 90202331A EP 0416696 A2 EP0416696 A2 EP 0416696A2
Authority
EP
European Patent Office
Prior art keywords
voltage
ray
cable
ray tube
voltage generator
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
EP90202331A
Other languages
German (de)
English (en)
Other versions
EP0416696A3 (en
EP0416696B1 (fr
Inventor
Georg Dr. Licht
Helmut Kiesow
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.)
Philips Intellectual Property and Standards GmbH
Koninklijke Philips NV
Original Assignee
Philips Patentverwaltung GmbH
Philips Gloeilampenfabrieken NV
Koninklijke Philips Electronics NV
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 Philips Patentverwaltung GmbH, Philips Gloeilampenfabrieken NV, Koninklijke Philips Electronics NV filed Critical Philips Patentverwaltung GmbH
Publication of EP0416696A2 publication Critical patent/EP0416696A2/fr
Publication of EP0416696A3 publication Critical patent/EP0416696A3/de
Application granted granted Critical
Publication of EP0416696B1 publication Critical patent/EP0416696B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Images

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

Definitions

  • the invention relates to an x-ray device with an x-ray emitter and a high-voltage generator for supplying the x-ray emitter with high voltage via at least one high-voltage cable.
  • X-ray devices of this type are generally known.
  • the object of the invention is to reduce the risk of damage to the X-ray tube. This object is achieved in that parallel to the output of the high voltage generator, the series connection of its non-conductive diode in normal operation and a damping resistor is provided, which is of the order of the characteristic impedance.
  • the invention is based on the finding that the X-ray tube, in the event of this fault, is the high-voltage cable abruptly short-circuits, whereby a weakly damped vibration is generated in the cable.
  • a cable short-circuited at one end acts like a parallel resonant circuit.
  • the cable length corresponds to a quarter of the wavelength.
  • the resonance frequency results from the signal speed divided by four times the cable length.
  • the cable discharges over the tube and then recharges with the opposite polarity.
  • the diode which is normally blocked, now becomes conductive and the cable is terminated with the resistor, which corresponds to a strongly damped resonant circuit.
  • the energy of the cable is essentially converted into heat in the terminating resistor. It is advantageous if the diode is not a very fast diode, so that it can also conduct in the back half-wave.
  • the anode of the X-ray tube contained in the X-ray emitter 1 is grounded, while its cathode is operated at a negative high voltage of, for example, 225 kV. This is supplied by an X-ray generator 2.
  • the high voltage generated in this high voltage generator in a manner not shown in detail is generally available on a smoothing capacitor 21.
  • the high-voltage generator 2 is connected to the x-ray emitter 1 via a high-voltage cable 3 with three inner conductors 31, only one of which is shown in FIG. 1 and which has practically the same high-voltage potential (the small voltage differences between these inner conductors serve the purpose Generation of a heating current in the two filaments of the cathode).
  • the high-voltage cable also comprises, in a known manner, a grounded wire mesh 32, preferably made of copper, which surrounds the inner conductor 31.
  • the high voltage at the capacitor 21 is not fed directly to the inner conductor 31 of the high-voltage cable 3 connected to the cathode, but via an output resistor 22 of, for example, 100 kohm. This output resistance has the task of limiting the current flowing in the generator in the event of a short circuit.
  • the series connection of a diode 25 and a resistor 26 is connected to the output of the high-voltage generator 2.
  • the value of the resistor 26 must correspond at least in the order of magnitude to the characteristic impedance of the high-voltage cable and the diode 25 must be polarized so that it is blocked by the high voltage prevailing in normal operation.
  • an oscillation results at the output of the high-voltage generator 2, in which the high voltage at the output of the high-voltage generator reverses its polarity in accordance with the natural resonance of the high-voltage cable. Whenever the polarity is reversed, the oscillating current flows through the resistor 26 and is dampened.
  • the load impedance formed by the series circuit 25 and 26 is effective only in terms of radio frequency.
  • This solution requires a diode (or a large number of diodes connected in series), the reverse voltage of which corresponds to the high voltage of the X-ray generator and which must be acted upon by the strong current through the X-ray tube in the event of a fault.

Landscapes

  • X-Ray Techniques (AREA)
EP90202331A 1989-09-05 1990-09-03 Dispositif radiologique Expired - Lifetime EP0416696B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3929402 1989-09-05
DE3929402A DE3929402A1 (de) 1989-09-05 1989-09-05 Roentgeneinrichtung

Publications (3)

Publication Number Publication Date
EP0416696A2 true EP0416696A2 (fr) 1991-03-13
EP0416696A3 EP0416696A3 (en) 1991-08-14
EP0416696B1 EP0416696B1 (fr) 1993-08-25

Family

ID=6388637

Family Applications (1)

Application Number Title Priority Date Filing Date
EP90202331A Expired - Lifetime EP0416696B1 (fr) 1989-09-05 1990-09-03 Dispositif radiologique

Country Status (4)

Country Link
US (1) US5093853A (fr)
EP (1) EP0416696B1 (fr)
JP (1) JPH0398298A (fr)
DE (2) DE3929402A1 (fr)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0421720A3 (en) * 1989-10-05 1991-10-16 General Electric Company Transient suppression in cables
EP0491519A1 (fr) * 1990-12-18 1992-06-24 General Electric Company Système pour l'élimination du bruit transitoire d'un tube à rayons X
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

Families Citing this family (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4138889A1 (de) * 1991-01-30 1992-08-13 Felten & Guilleaume Energie Roentgenleitung
DE4201616A1 (de) * 1992-01-22 1993-07-29 Philips Patentverwaltung Roentgeneinrichtung
DE19500733B4 (de) * 1994-01-31 2006-08-17 Siemens Ag Röntgenstrahleranordnung
DE19536247C2 (de) * 1995-09-28 1999-02-04 Siemens Ag Röntgenröhre
US6738275B1 (en) 1999-11-10 2004-05-18 Electromed Internationale Ltee. High-voltage x-ray generator
US7081436B2 (en) 2001-01-26 2006-07-25 General Electric Company Paste formulation for seed treatment of plants
DE10300542A1 (de) * 2003-01-09 2004-07-22 Siemens Ag Hochspannungs-Versorgung für eine Röntgeneinrichtung
MX2010002650A (es) 2007-09-14 2010-03-30 Du Pont Metodo de desinfeccion de semilla liquido para desinfectar cantidades pequeñas de semilla.
DE102014015974B4 (de) * 2014-10-31 2021-11-11 Baker Hughes Digital Solutions Gmbh Anschlusskabel zur Verminderung von überschlagsbedingten transienten elektrischen Signalen zwischen der Beschleunigungsstrecke einer Röntgenröhre sowie einer Hochspannungsquelle

Family Cites Families (8)

* 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
US2976462A (en) * 1956-11-13 1961-03-21 Sanborn Company Protective system
NL7703425A (nl) * 1977-03-30 1978-10-03 Philips Nv Inrichting met een transformator voor sprong- vormig veranderende spanningen.
NL7703493A (nl) * 1977-03-31 1978-10-03 Philips Nv Inrichting met een op hoogspanning bedreven elektronenbuis.
DE2917636A1 (de) * 1979-05-02 1980-11-13 Philips Patentverwaltung Roentgengenerator
DE3639088A1 (de) * 1986-11-14 1988-05-26 Siemens Ag Schaltungsanordnung mit einem schutzwiderstand zur strombegrenzung bei roentgenstrahlern
DE8807359U1 (de) * 1988-06-06 1989-10-12 Siemens AG, 1000 Berlin und 8000 München Röntgenstrahler
US5008912A (en) * 1989-10-05 1991-04-16 General Electric Company X-ray tube high voltage cable transient suppression

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0421720A3 (en) * 1989-10-05 1991-10-16 General Electric Company Transient suppression in cables
EP0491519A1 (fr) * 1990-12-18 1992-06-24 General Electric Company Système pour l'élimination du bruit transitoire d'un tube à rayons X
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

Also Published As

Publication number Publication date
EP0416696A3 (en) 1991-08-14
DE59002462D1 (de) 1993-09-30
JPH0398298A (ja) 1991-04-23
EP0416696B1 (fr) 1993-08-25
DE3929402A1 (de) 1991-03-07
US5093853A (en) 1992-03-03

Similar Documents

Publication Publication Date Title
EP0416696B1 (fr) Dispositif radiologique
DE756225C (de) Selbstsperrender Kippschwingungserzeuger
DE2824326C2 (fr)
DE69019663T2 (de) Unterdrückung von Transienten in Kabeln.
DE3324589A1 (de) Hochspannungs-wechselspannungsquelle fuer neutralisationsvorrichtungen zur beseitigung statischer aufladungen
DE19547969C1 (de) Elektrisches Filter
DE2717651A1 (de) Lichtbogen-schweissgeraet
DE3338301C2 (fr)
DE69706397T2 (de) Versorgungsschaltung für Entladungslampen mit symmetrischer Resonanzschaltung
DE2118938C3 (de) Impulsgenerator
EP2281206B1 (fr) Générateur de très basse fréquence pour essais
DE900950C (de) Impulsgenerator mit einem impulsbildenden Netzwerk
DE2056847A1 (de) Inverterschaltung
DE2849529C2 (fr)
DE19707504A1 (de) Elektrische Schaltung für einen impulserregten elektrostatischen Abscheider und impulserregter elektrostatischer Abscheider dieser Schaltung
DE2851573A1 (de) Schaltungsanordnung fuer eine elektrische entladungslampe
DE2811907A1 (de) Anordnung mit einer auf hochspannung betriebenen elektronenroehre
DE2745417C2 (de) Schaltung zum Erzeugen eines sägezahnförmigen Stroms in einer Spule
DE10328113A1 (de) Vorrichtung zum Betreiben einer schwingfähigen Einheit eines Vibrationsresonators
DE3201617C2 (fr)
DE3420915A1 (de) Frequenzaenderungsvorrichtung
DE3437953C2 (fr)
DE2045202C3 (de) Schaltung zur Auswahl einer von zwei vorgegebenen Oberwellen eines Diodenvervielfachers
DE2748641A1 (de) Impulsgenerator
DE750719C (de) Anordnung zur Stossspannungspruefung von unter Betriebsspannung stehenden elektrischen mehrphasigen Maschinen und Apparaten

Legal Events

Date Code Title Description
PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

Free format text: ORIGINAL CODE: 0009012

AK Designated contracting states

Kind code of ref document: A2

Designated state(s): DE FR GB

PUAL Search report despatched

Free format text: ORIGINAL CODE: 0009013

AK Designated contracting states

Kind code of ref document: A3

Designated state(s): DE FR GB

17P Request for examination filed

Effective date: 19920214

17Q First examination report despatched

Effective date: 19921002

GRAA (expected) grant

Free format text: ORIGINAL CODE: 0009210

AK Designated contracting states

Kind code of ref document: B1

Designated state(s): DE FR GB

REF Corresponds to:

Ref document number: 59002462

Country of ref document: DE

Date of ref document: 19930930

ET Fr: translation filed
GBT Gb: translation of ep patent filed (gb section 77(6)(a)/1977)

Effective date: 19931122

PLBE No opposition filed within time limit

Free format text: ORIGINAL CODE: 0009261

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: NO OPPOSITION FILED WITHIN TIME LIMIT

26N No opposition filed
REG Reference to a national code

Ref country code: FR

Ref legal event code: CD

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: GB

Payment date: 19970829

Year of fee payment: 8

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: FR

Payment date: 19970923

Year of fee payment: 8

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: DE

Payment date: 19971121

Year of fee payment: 8

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: GB

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 19980903

REG Reference to a national code

Ref country code: FR

Ref legal event code: CD

GBPC Gb: european patent ceased through non-payment of renewal fee

Effective date: 19980903

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: FR

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 19990531

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: DE

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 19990701

REG Reference to a national code

Ref country code: FR

Ref legal event code: ST