EP0669791B1 - Tube radiogène à anode tournante avec un circuit d'accélération et de freinage du anode tournante - Google Patents

Tube radiogène à anode tournante avec un circuit d'accélération et de freinage du anode tournante Download PDF

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Publication number
EP0669791B1
EP0669791B1 EP95200374A EP95200374A EP0669791B1 EP 0669791 B1 EP0669791 B1 EP 0669791B1 EP 95200374 A EP95200374 A EP 95200374A EP 95200374 A EP95200374 A EP 95200374A EP 0669791 B1 EP0669791 B1 EP 0669791B1
Authority
EP
European Patent Office
Prior art keywords
voltage
anode
ray tube
rotary
stator winding
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.)
Expired - Lifetime
Application number
EP95200374A
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German (de)
English (en)
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EP0669791A1 (fr
Inventor
Gerd Vogler
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 Corporate Intellectual Property GmbH
Philips Patentverwaltung GmbH
Koninklijke Philips Electronics NV
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Publication date
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Publication of EP0669791A1 publication Critical patent/EP0669791A1/fr
Application granted granted Critical
Publication of EP0669791B1 publication Critical patent/EP0669791B1/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
    • H05G1/66—Circuit arrangements for X-ray tubes with target movable relatively to the anode

Definitions

  • the invention relates to a circuit arrangement according to the preamble of claim 1.
  • Such a circuit arrangement is known from US Pat. No. 3,963,930.
  • the Stator windings via a series of switches optionally with one AC voltage source for a low speed, an AC voltage source for a high speed and connected to a DC voltage source.
  • the switches are controlled by a control device so that one of the two alternating voltage sources is connected to the stator windings and in Brake mode the DC voltage source.
  • the object of the present invention is a simple circuit arrangement of the specify the type mentioned at the beginning. According to the invention, this object is achieved by that at least one of the stator windings is connected to a voltage source, the a periodic alternating voltage in a first operating state and in a second Operating state provides a pulsating DC voltage that this stator winding diode arrangement of such polarity that can be switched on and off is connected in parallel such that it is operated by the pulsating DC voltage source in the reverse direction and that the Control device in acceleration mode the AC voltage source in the first Operational state holds and turns off the diode array and that it is in braking mode holds the AC voltage source in the second state and the diode arrangement switches on.
  • the voltage source that the one stator winding feeds is therefore both in acceleration mode and in braking mode effective.
  • the AC voltage source has two switching elements, each with a switch that the switches are connected to a DC voltage and in the first Operating state are switched periodically and that in the second operating state one switching element is locked and the other is switched on and off periodically.
  • the switching voltage alternates with the switching elements opposite polarity to which a stator winding is connected and through Locking the one switching element can easily be used for the braking mode required pulsating DC voltage are generated.
  • At least one of the Switching elements have a double function, i.e. it acts in acceleration and in Braking mode, which further reduces the circuitry.
  • the two switching elements in connection with the one supplying the direct voltage DC voltage source act as an inverter, and it is clear that - at a drive motor with two stator windings - for the other stator winding with the help of two further switching elements, but the same DC voltage source additional inverter could be built, the output voltage around 90 ° would be offset from that of the first inverter.
  • means for generating an in offset by 90 ° with respect to the voltage on the second stator winding Control signals are provided and that means for deriving the switching signals for the switching elements are provided from the control signal. This will make the Establishing the 90 ° phase relationship between the voltages on the Stator windings are particularly simple.
  • a Rectangular voltage source (33, 34) which has a rectangular signal adjustable duty cycle for controlling a switching element (21) in braking mode generated. With this configuration, the strength of the Affect braking.
  • Fig. 1 is the rotating anode-carrying rotor of a drive motor for denotes the rotating anode of a rotating anode X-ray tube and 2 or 3 denotes the associated stator windings offset by 90 °.
  • the rotor is a squirrel-cage rotor and the drive motor is an asynchronous motor.
  • the cathode carries high voltage potential during operation of the x-ray tube and the stator winding ground potential. This results in between rotor 1 and Stator 2, 3 a low magnetic coupling. Otherwise, the rotating anode X-ray tube not shown in detail.
  • the electrical power for acceleration and deceleration is the three Connections L1, L2, L3 taken from a three-phase network, at which opposite offset their common zero point N three by 120 ° AC voltages with mains frequency are present. From the three AC voltages is a positive by a rectifier diode 18 on a capacitor 10 DC voltage generated; likewise the three AC voltages become over oppositely polarized rectifier diodes 18 on a capacitor 20 a negative DC voltage is generated.
  • the two capacitors 10 and 20 are in Series connected and at their common connection point with the zero point N connected to the three-phase network, which is also connected to the two Stator windings 2 and 3 common connection point 5 is connected.
  • Capacitors 10 and 20 are controllable switches in the form of IGBT transistors 11, 21 connected to each other.
  • the common connection point of the two transistors is connected to the second terminal 4 of the stator winding 2 connected.
  • the IGBT transistors 11 and 21 each have a diode 12, 22 switched anti-parallel. So these diodes are normally non-conductive, it is because the voltage at terminal 4 is more positive than the voltage at the capacitor 10 or more negative than the voltage across capacitor 20.
  • the elements 10. . . 12 or 20. . . 22, put an inverter in Half-bridge circuit. Instead, one could in principle also Inverters are used in full bridge circuit, in which the Stator winding 2 via two switching elements, each with two switches with one DC voltage source is connected, as is known from US Pat. No. 3,832,553. However, the effort would be higher - even if one of the Rectifier groups 18 or 28 and the associated capacitor 10 or 20 could be omitted. - When the rotating anode accelerates, the switches 11 and 21 in push-pull mode on and off, so that the stator winding 2 a square-wave AC voltage (without DC component) results.
  • the stator winding 2 is also the series connection of a diode 30 and an IGBT transistor switch 31 connected in parallel. This transistor switch is only conductive in the braking phase (closed). Port 6 of the second Winding 3 is via a (triac) switch 7 with the AC voltage connection L1 connected.
  • the switches 7, 11, 21 and 31 are switched via optocouplers, one of which Part - the receiving part 8a, 13a, 23a, 32a - is shown in Fig. 1 and their other part - the transmitting part 8b, 13b, 23b and 32b - in Fig. 2 in connection with the control device is shown.
  • the control device delivers the Control of the four switches mentioned required switching signals.
  • the output signal of the Phase shifter 16 is the first input of an AND gate 24 and over an inverter 17 is fed to the first input of an AND gate 14.
  • the second inputs of these AND gates are to a control input ACL connected, which also with the optocoupler 8b / 8a to control the Switch 7 is connected.
  • the output of the AND gate 14 is connected to the Optocoupler 13b / a connected to control the IGBT transistor 11 while the AND gate 24 is connected to the one input of an OR gate 36 is the output of which is connected to the optocoupler 23b / a, which the Switching signals for the IGBT switching transistor 21 provides.
  • the control device also contains a generator 33 which generates a triangular AC voltage of, for example, 320 Hz.
  • This AC voltage is compared in a comparator 34 with an adjustable DC voltage V R , so that a 320 Hz square-wave signal results at the output of the comparator, the pulse duty factor of which depends on the polarity of the DC voltage V R and its magnitude in relation to the triangular signal of the generator 33.
  • the output signal of the comparator 34 is fed to one input of an AND gate 35, the output of which is connected to the second input of the OR gate 36.
  • the second input of the AND gate 35 is connected to a control input BRT, which at the same time controls the IGBT switch 31 via the optocoupler 32b / 32a.
  • the circuit works as follows:
  • the rotor 1 If the user wants to take an X-ray, the rotor 1 must be off the standstill can be accelerated to its nominal speed. To this end is for a defined period, e.g. a second, the signal on Control input ACL set to "1" while the control signal at the control input BRT “0" remains.
  • the AND gates deliver during this period 14 and 24 square-wave signals in phase opposition to one another, via the optocouplers 13a / b and 23a / b the IGBT switches 11 and 21 in push-pull on and turn off so that there is a square wave voltage across the stator winding 2 Mains frequency results in that compared to the mains voltage between L1 and N by 90 ° is shifted in phase.
  • the optocoupler 8b / a makes during the mentioned period, the switch 7 conductive, so that on the stator winding 3 sinusoidal AC voltage is present.
  • the switch 7 conductive, so that on the stator winding 3 sinusoidal AC voltage is present.
  • the DC voltage on the capacitors 10 and 20 each have the amplitude corresponds to the AC voltage, has the square wave voltage on the stator winding 2 the same amplitude as the sinusoidal AC voltage on the Stator winding 3. Because the sinusoidal contained in a square wave voltage Fundamental has an amplitude about 27% higher than that Square-wave voltage, the current is through with identical stator windings the winding 2 is correspondingly larger than the current through the stator winding 3. This asymmetry is not intrinsically disturbing; if necessary, it can be eliminated that the stator winding 2 is a correspondingly higher Number of windings.
  • the signal ACL After the acceleration period has expired, the signal ACL also becomes "0". The The rotating anode has then reached its target speed and is running due to it Moment of inertia even during the following X-ray exposure further. All switches are locked.
  • the invention therefore goes a different way.
  • the circuit arrangement can also be connected to one single-phase AC network operated, the AC voltage to the Connection L1 would have to be supplied.
  • the capacitors 10, 20 would then have to additional capacitors can be connected in parallel to the ripple of the Keep DC voltage low.

Landscapes

  • X-Ray Techniques (AREA)

Claims (5)

  1. Agencement de circuit d'accélération et de freinage d'un moteur d'entraínement avec des enroulements de stator (2, 3) pour une anode tournante 1 d'un tube à rayons X à anode tournante, dans lequel des tensions alternatives décalées dans leur phase peuvent être amenées aux enroulements du stator (2, 3) dans un mode d'accélération et une tension continue (10...12, 20...22) agit dans un mode de freinage sur au moins un des enroulements de stator (2), ledit circuit renfermant un dispositif de commande pour le mode d'accélération et le mode de freinage, caractérisé en ce qu'au moins un des enroulements de stator est raccordé à une source de tension qui délivre dans un premier état de fonctionnement une tension alternative périodique et dans un deuxième état de fonctionnement une tension continue pulsée, en ce qu'un dispositif de diode (30) à mettre en et hors circuit est monté en parallèle à l'enroulement de stator et présente une polarité telle qu'il est entraíné par la tension continue (20-22) pulsée à l'état de blocage, que le dispositif de commande (14...16, 34...36) maintient la source de tension alternative dans un premier état de fonctionnement en mode d'accélération et met hors circuit le dispositif de diode, et qu'il maintient la source de tension alternative dans un deuxième état en mode de freinage et met en circuit le dispositif de diode.
  2. Tube à rayons X à anode tournante selon la revendication 1, caractérisé en ce que la source de tension alternative présente deux organes de commutation (11, 21) avec au moins un commutateur, que les organes de commutation sont raccordés à une tension continue et sont montés périodiquement dans un premier état de fonctionnement et que, dans le deuxième état de fonctionnement, l'un des organes de commutation (Il) est bloqué et l'autre (21) est mis sous et hors circuit périodiquement.
  3. Tube à rayons X à anode tournante selon la revendication 2, caractérisé en ce que le moteur d'entraínement présente deux enroulements de stator (2, 3), qu'il est prévu un dispositif de redresseur (18, 28) dont la sortie de tension continue est reliée par l'intermédiaire des organes de commutation (11, 21) au premier enroulement de stator 2 et que son entrée de tension alternative est reliée au deuxième enroulement de stator 3.
  4. Tube à rayons X à anode tournante selon la revendication 3, caracténsé en ce que les moyens (15, 16) pour la production d'un signal de commande décalé de 90° par rapport à la tension sur le deuxième enroulement de stator (3) sont prévus et que des moyens de dérivation des signaux de commutation (14, 24) sont prévus pour les organes de commutation à partir du signal de commande.
  5. Tube à rayons X à anode tournante selon la revendication 2. caractérisé en ce qu'il est prévu une source de tension rectangulaire (33, 34) qui produit un signal rectangulaire avec un rapport de balayage réglable en vue de la commande d'un des organes de commutation (21) en mode de freinage.
EP95200374A 1994-02-23 1995-02-16 Tube radiogène à anode tournante avec un circuit d'accélération et de freinage du anode tournante Expired - Lifetime EP0669791B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE4405767 1994-02-23
DE4405767A DE4405767A1 (de) 1994-02-23 1994-02-23 Schaltungsanordnung zum Beschleunigen und Abbremsen der Drehanode einer Drehanoden-Röntgenröhre

Publications (2)

Publication Number Publication Date
EP0669791A1 EP0669791A1 (fr) 1995-08-30
EP0669791B1 true EP0669791B1 (fr) 1999-12-29

Family

ID=6510960

Family Applications (1)

Application Number Title Priority Date Filing Date
EP95200374A Expired - Lifetime EP0669791B1 (fr) 1994-02-23 1995-02-16 Tube radiogène à anode tournante avec un circuit d'accélération et de freinage du anode tournante

Country Status (4)

Country Link
US (1) US5566219A (fr)
EP (1) EP0669791B1 (fr)
JP (1) JP3558722B2 (fr)
DE (2) DE4405767A1 (fr)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6570778B2 (en) * 2001-08-30 2003-05-27 Wisconsin Alumni Research Foundation Adjustable speed drive for single-phase induction motors
CN113543437A (zh) * 2020-04-22 2021-10-22 合肥美亚光电技术股份有限公司 X射线发生装置和医用成像设备
US11523793B2 (en) 2020-05-08 2022-12-13 GE Precision Healthcare LLC Methods for x-ray tube rotors with speed and/or position control
US11309160B2 (en) 2020-05-08 2022-04-19 GE Precision Healthcare LLC Methods and systems for a magnetic motor X-ray assembly

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3963930A (en) * 1974-12-05 1976-06-15 Advanced Instrument Development, Inc. System for controlling operation of the rotating anode of an x-ray tube
US4065673A (en) * 1975-08-04 1977-12-27 Advanced Instrument Development, Inc. Rotor controller systems for X-ray tubes
DD152699A3 (de) * 1979-09-13 1981-12-09 Dieter Mailand Schaltungsanordnung fuer den antrieb der drehanode einer roentgenroehre
US4468598A (en) * 1981-01-02 1984-08-28 The Machlett Laboratories, Incorporated Pulsed X-ray tube motor
JP2752058B2 (ja) * 1986-11-19 1998-05-18 株式会社東芝 Ｘ線管の回転陽極駆動装置
US4829551A (en) * 1988-01-13 1989-05-09 Picker International, Inc. Biphase quadrature drive for an x-ray tube rotor
US5090041A (en) * 1990-09-20 1992-02-18 Picker International, Inc. X-ray tube anode speed reducer

Also Published As

Publication number Publication date
DE4405767A1 (de) 1995-08-24
US5566219A (en) 1996-10-15
JPH07263177A (ja) 1995-10-13
JP3558722B2 (ja) 2004-08-25
DE59507499D1 (de) 2000-02-03
EP0669791A1 (fr) 1995-08-30

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