EP0487766A1 - Générateur radiologique pour appareil de radiodiagnostic comportant un onduleur alimentant son transformateur à haute tension - Google Patents

Générateur radiologique pour appareil de radiodiagnostic comportant un onduleur alimentant son transformateur à haute tension Download PDF

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Publication number
EP0487766A1
EP0487766A1 EP90122683A EP90122683A EP0487766A1 EP 0487766 A1 EP0487766 A1 EP 0487766A1 EP 90122683 A EP90122683 A EP 90122683A EP 90122683 A EP90122683 A EP 90122683A EP 0487766 A1 EP0487766 A1 EP 0487766A1
Authority
EP
European Patent Office
Prior art keywords
voltage transformer
ray diagnostic
inverter
voltage
circuit
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.)
Withdrawn
Application number
EP90122683A
Other languages
German (de)
English (en)
Inventor
Peter Dipl.-Ing. Schweighofer
Peter Dipl.-Ing. Tichy
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.)
Siemens AG
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
Priority to EP90122683A priority Critical patent/EP0487766A1/fr
Priority to JP33138591A priority patent/JPH04284398A/ja
Publication of EP0487766A1 publication Critical patent/EP0487766A1/fr
Withdrawn legal-status Critical Current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
    • H05G1/10—Power supply arrangements for feeding the X-ray tube
    • H05G1/20—Power supply arrangements for feeding the X-ray tube with high-frequency ac; with pulse trains
    • 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 diagnostic generator with an X-ray tube, a high-voltage transformer feeding the X-ray tube, an inverter connected to the input of the high-voltage transformer, and a line rectifier feeding the inverter, in which the inverter has a circuit for alternately connecting the connections of an LC oscillating circuit to the poles of a DC voltage source .
  • the high-voltage transformer can be constructed much smaller and lighter than in the case of an X-ray diagnostic generator which is operated at the mains frequency.
  • an X-ray diagnostic generator of this type it is known to construct the LC resonant circuit from the series connection of a capacitor with the primary winding of the high-voltage transformer, that is, to use the inductance of the high-voltage transformer as an resonant circuit inductor. This results in a simple, space-saving structure.
  • the invention has for its object to simplify an X-ray diagnostic generator of the type mentioned in terms of the space required even further.
  • the LC resonant circuit is formed by the capacitance and inductance of the high-voltage transformer
  • the primary winding of the High-voltage transformer is formed by two metal strips insulated from one another, the opposite ends of which are led outwards and form the connections of the LC resonant circuit.
  • the high-voltage transformer is designed so that its capacitance and inductance are suitable for forming the LC resonant circuit.
  • a special resonant circuit capacitor can accordingly be dispensed with.
  • a resonance circuit is formed by a winding of two metal strips, the inductance and capacitance of which can be designed according to the requirements by suitable choice of material and dimensioning.
  • the capacity is determined by the type and thickness of the insulation and the area of the metal strips.
  • the resonance frequency of such a primary winding can be varied within wide limits. Accordingly, it can also be determined according to the requirements.
  • FIG. 1 An X-ray tube 1 is shown in FIG. 1, which is fed by a high-voltage transformer 2 via a high-voltage rectifier 3.
  • the structural design of the primary winding of the high-voltage transformer 2 creates inductive and capacitive coatings, which are represented in the equivalent circuit diagram by a series of inductors 4 and capacitors 5.
  • the inductors 4 and the capacitors 5 form a series resonant circuit.
  • This series resonant circuit is alternately with two capacitors 8 and 9 via two thyristors 6 and 7 connected, which are charged via a rectifier circuit 10 from the AC network with the drawn polarity.
  • Parallel to the thyristors 6 and 7 are freewheeling diodes 11 and 12.
  • the thyristor and diode combinations can also be replaced by other, high-frequency switching components.
  • the capacitors 5 are charged with the polarity shown, to a voltage which is higher than the voltage of the capacitor 8 due to the leakage inductance of the high-voltage transformer 2.
  • the thyristor 6 goes out when the charging current has become zero.
  • the higher voltage across the capacitors 5 than the voltage across the capacitor 8 drives a discharge current via the freewheeling diode 11. This discharge current becomes zero when the voltages across the capacitors 5 and 8 are equal. Accordingly, a voltage half-wave is present on the primary winding of the high-voltage transformer 2.
  • the capacitors 5 are charged to a voltage above the voltage of the capacitor 9 with a polarity opposite to the drawn polarity and the processes described are repeated analogously in connection with the freewheeling diode 12. Accordingly a second half-wave of opposite polarity follows the first half-wave on the primary winding.
  • a half-wave which has the same polarity as the first half-wave, follows again.
  • the frequency of the supply voltage of the high-voltage transformer 2 can be set by determining the ignition times of the thyristors 6 and 7. It is conceivable to increase the frequency so that the increasing freewheeling current is deflected by the diodes 11, 12 into the other thyristor branch.
  • the capacitors 8 and 9 ensure a smoothed input voltage of the inverter 4 to 7, 11, 12, so that the peak voltage on the primary winding and thus also on the X-ray tube 1 is largely constant.
  • FIG. 2 shows the structure of the primary winding of the high-voltage transformer 2 in more detail.
  • Two metal strips 15, 16 are wound on an iron core 14 and are separated from one another by insulating strips 17, 18.
  • the opposite ends of the metal strips 15, 16 are guided outwards and provided with the connections 19, 20 for the primary winding of the high-voltage transformer 2.
  • the inductive and capacitive coating of a layer winding applied in this way already forms the desired series resonant circuit without the need for a discrete component as a resonant circuit capacitor.
  • the equivalent circuit diagram of the high-voltage transformer 2 with the inductors 4 and the capacitors 5 is shown in FIG. 1 as explained above.
  • the inverter 4 to 7, 11, 12 feeding the high-voltage transformer 2 is formed by a half-bridge with two thyristors 6, 7.
  • a transformer constructed in this way can also be used in a resonant circuit inverter 22 for heating the filament of the X-ray tube 1, i.e. can be used to supply the heating transformer 21.

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  • X-Ray Techniques (AREA)
EP90122683A 1990-11-27 1990-11-27 Générateur radiologique pour appareil de radiodiagnostic comportant un onduleur alimentant son transformateur à haute tension Withdrawn EP0487766A1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
EP90122683A EP0487766A1 (fr) 1990-11-27 1990-11-27 Générateur radiologique pour appareil de radiodiagnostic comportant un onduleur alimentant son transformateur à haute tension
JP33138591A JPH04284398A (ja) 1990-11-27 1991-11-20 Ｘ線診断発生器

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP90122683A EP0487766A1 (fr) 1990-11-27 1990-11-27 Générateur radiologique pour appareil de radiodiagnostic comportant un onduleur alimentant son transformateur à haute tension

Publications (1)

Publication Number Publication Date
EP0487766A1 true EP0487766A1 (fr) 1992-06-03

Family

ID=8204760

Family Applications (1)

Application Number Title Priority Date Filing Date
EP90122683A Withdrawn EP0487766A1 (fr) 1990-11-27 1990-11-27 Générateur radiologique pour appareil de radiodiagnostic comportant un onduleur alimentant son transformateur à haute tension

Country Status (2)

Country Link
EP (1) EP0487766A1 (fr)
JP (1) JPH04284398A (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102291920A (zh) * 2011-07-07 2011-12-21 井冈山大学 准谐振型高频x线机的控制方法和控制电路

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2415414A1 (fr) * 1978-01-20 1979-08-17 Siemens Ag Generateur radiologique pour appareils de radiodiagnostic comportant un onduleur alimentant son transformateur a haute tension
GB2100480A (en) * 1981-06-12 1982-12-22 Gen Equip Med Sa Semiconductor voltage regulator circuit
EP0108336A2 (fr) * 1982-11-03 1984-05-16 General Electric Company Dispositif d'alimentation de puissance à haute fréquence pour générateur à rayons X
EP0143657A2 (fr) * 1983-11-30 1985-06-05 Kabushiki Kaisha Toshiba Appareil de radiographie numérique
DE3541618A1 (de) * 1984-11-26 1986-06-05 Kabushiki Kaisha Toshiba, Kawasaki, Kanagawa Vorrichtung zum erzeugen einer gleichstrom-hochspannung fuer eine roentgenroehre
US4794506A (en) * 1987-01-30 1988-12-27 Hitachi Medical Corporation Resonant DC-DC converter

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2415414A1 (fr) * 1978-01-20 1979-08-17 Siemens Ag Generateur radiologique pour appareils de radiodiagnostic comportant un onduleur alimentant son transformateur a haute tension
GB2100480A (en) * 1981-06-12 1982-12-22 Gen Equip Med Sa Semiconductor voltage regulator circuit
EP0108336A2 (fr) * 1982-11-03 1984-05-16 General Electric Company Dispositif d'alimentation de puissance à haute fréquence pour générateur à rayons X
EP0143657A2 (fr) * 1983-11-30 1985-06-05 Kabushiki Kaisha Toshiba Appareil de radiographie numérique
DE3541618A1 (de) * 1984-11-26 1986-06-05 Kabushiki Kaisha Toshiba, Kawasaki, Kanagawa Vorrichtung zum erzeugen einer gleichstrom-hochspannung fuer eine roentgenroehre
US4794506A (en) * 1987-01-30 1988-12-27 Hitachi Medical Corporation Resonant DC-DC converter

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102291920A (zh) * 2011-07-07 2011-12-21 井冈山大学 准谐振型高频x线机的控制方法和控制电路

Also Published As

Publication number Publication date
JPH04284398A (ja) 1992-10-08

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