EP0669791B1 - Drehanoden-Röntgenröhre mit einer Schaltungsanordnung zum Beschleunigen und Abbremsen der Drehanode - Google Patents
Drehanoden-Röntgenröhre mit einer Schaltungsanordnung zum Beschleunigen und Abbremsen der Drehanode Download PDFInfo
- 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
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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)
Description
- Fig. 1
- die erfindungsgemäße Schaltungsanordnung und
- Fig. 2
- die zugehörige Steuereinrichtung.
Claims (5)
- Schaltungsanordnung zum Beschleunigen und Abbremsen eines Antriebsmotors mit Statorwicklungen (2, 3) für eine Drehanode (1) einer Drehanoden-Röntgenröhre, bei der den Statorwicklungen (2, 3) in einem Beschleunigungs-Modus in der Phase versetzte Wechselspannungen zuführbar sind und bei der in einem Brems-Modus auf wenigstens eine der Statorwicklungen (2) eine Gleichspannung (10 ... 12; 20 ... 22) einwirkt, mit einer Steuereinrichtung für den Beschleunigungs-Modus und den Brems-Modus, dadurch gekennzeichnet, daß wenigstens eine der Statorwicklungen an eine Spannungsquelle angeschlossen ist, die in einem ersten Betriebszustand eine periodische Wechselspannung und in einem zweiten Betriebszustand eine pulsierende Gleichspannung liefert, daß dieser Statorwicklung eine ein- und ausschaltbare Diodenanordnung (30) in solcher Polarität parallelgeschaltet ist, daß sie durch die pulsierende Gleichspannung (20-22) in Sperrichtung betrieben wird und daß die Steuereinrichtung (14 ... 16, 34 ... 36) im Beschleunigungs-Modus die Wechselspannungsquelle im ersten Betriebszustand hält und die Diodenanordnung ausschaltet und daß sie im Brems-Modus die Wechselspannungsquelle im zweiten Zustand hält und die Diodenanordnung einschaltet.
- Schaltungsanordnung nach Anspruch 1,
dadurch gekennzeichnet, daß die Wechselspannungsquelle zwei Schaltglieder (11, 21) mit wenigstens je einem Schalter aufweist, daß die Schaltglieder an eine Gleichspannung angeschlossen sind und im ersten Betriebszustand periodisch geschaltet sind und daß im zweiten Betriebszustand das eine Schaltglied (11) gesperrt und das andere (21) periodisch ein- und ausgeschaltet ist. - Schaltungsanordnung nach Anspruch 2,
dadurch gekennzeichnet, daß der Antriebsmotor zwei Statorwicklungen (2, 3) aufweist, daß eine Gleichrichteranordnung (18, 28) vorgesehen ist, deren Gleichspannungsausgang über die Schaltglieder (11, 21) mit der ersten Statorwicklung (2) verbunden ist, und deren Wechselspannungseingang mit der zweiten Statorwicklung (3) verbunden ist. - Schaltungsanordnung nach Anspruch 3,
dadurch gekennzeichnet, daß Mittel (15, 16) zum Erzeugen eines in bezug auf die Spannung an der zweiten Statorwicklung (3) um 90° versetzten Steuersignals vorgesehen sind und daß Mittel zum Ableiten der Schaltsignale (14, 24) für die Schaltglieder aus dem Steuersignal vorgesehen sind. - Schaltungsanordnung nach Anspruch 2,
dadurch gekennzeichnet, daß eine Rechteckspannungsquelle (33, 34) vorgesehen ist, die ein Rechtecksignal mit einstellbarem Tastverhältnis zur Steuerung des einen Schaltgliedes (21) im Brems-Modus erzeugt.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE4405767A DE4405767A1 (de) | 1994-02-23 | 1994-02-23 | Schaltungsanordnung zum Beschleunigen und Abbremsen der Drehanode einer Drehanoden-Röntgenröhre |
DE4405767 | 1994-02-23 |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0669791A1 EP0669791A1 (de) | 1995-08-30 |
EP0669791B1 true EP0669791B1 (de) | 1999-12-29 |
Family
ID=6510960
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP95200374A Expired - Lifetime EP0669791B1 (de) | 1994-02-23 | 1995-02-16 | Drehanoden-Röntgenröhre mit einer Schaltungsanordnung zum Beschleunigen und Abbremsen der Drehanode |
Country Status (4)
Country | Link |
---|---|
US (1) | US5566219A (de) |
EP (1) | EP0669791B1 (de) |
JP (1) | JP3558722B2 (de) |
DE (2) | DE4405767A1 (de) |
Families Citing this family (4)
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 |
US11309160B2 (en) | 2020-05-08 | 2022-04-19 | GE Precision Healthcare LLC | Methods and systems for a magnetic motor X-ray assembly |
US11523793B2 (en) | 2020-05-08 | 2022-12-13 | GE Precision Healthcare LLC | Methods for x-ray tube rotors with speed and/or position control |
Family Cites Families (7)
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 |
-
1994
- 1994-02-23 DE DE4405767A patent/DE4405767A1/de not_active Withdrawn
-
1995
- 1995-02-16 DE DE59507499T patent/DE59507499D1/de not_active Expired - Fee Related
- 1995-02-16 EP EP95200374A patent/EP0669791B1/de not_active Expired - Lifetime
- 1995-02-16 US US08/389,378 patent/US5566219A/en not_active Expired - Fee Related
- 1995-02-20 JP JP03085995A patent/JP3558722B2/ja not_active Expired - Fee Related
Also Published As
Publication number | Publication date |
---|---|
JP3558722B2 (ja) | 2004-08-25 |
US5566219A (en) | 1996-10-15 |
JPH07263177A (ja) | 1995-10-13 |
DE59507499D1 (de) | 2000-02-03 |
DE4405767A1 (de) | 1995-08-24 |
EP0669791A1 (de) | 1995-08-30 |
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