WO2004071296A1 - スイッチング式電源装置及びそれを用いた磁気共鳴イメージング装置 - Google Patents
スイッチング式電源装置及びそれを用いた磁気共鳴イメージング装置 Download PDFInfo
- Publication number
- WO2004071296A1 WO2004071296A1 PCT/JP2004/001292 JP2004001292W WO2004071296A1 WO 2004071296 A1 WO2004071296 A1 WO 2004071296A1 JP 2004001292 W JP2004001292 W JP 2004001292W WO 2004071296 A1 WO2004071296 A1 WO 2004071296A1
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- WO
- WIPO (PCT)
- Prior art keywords
- switching
- pwm
- current
- level
- power supply
- Prior art date
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Classifications
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
- H02M7/42—Conversion of dc power input into ac power output without possibility of reversal
- H02M7/44—Conversion of dc power input into ac power output without possibility of reversal by static converters
- H02M7/48—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M7/483—Converters with outputs that each can have more than two voltages levels
- H02M7/487—Neutral point clamped inverters
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R33/00—Arrangements or instruments for measuring magnetic variables
- G01R33/20—Arrangements or instruments for measuring magnetic variables involving magnetic resonance
- G01R33/28—Details of apparatus provided for in groups G01R33/44 - G01R33/64
- G01R33/38—Systems for generation, homogenisation or stabilisation of the main or gradient magnetic field
- G01R33/385—Systems for generation, homogenisation or stabilisation of the main or gradient magnetic field using gradient magnetic field coils
- G01R33/3852—Gradient amplifiers; means for controlling the application of a gradient magnetic field to the sample, e.g. a gradient signal synthesizer
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/0043—Converters switched with a phase shift, i.e. interleaved
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
- H02M7/42—Conversion of dc power input into ac power output without possibility of reversal
- H02M7/44—Conversion of dc power input into ac power output without possibility of reversal by static converters
- H02M7/48—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M7/493—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode the static converters being arranged for operation in parallel
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M3/00—Conversion of dc power input into dc power output
- H02M3/02—Conversion of dc power input into dc power output without intermediate conversion into ac
- H02M3/04—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters
- H02M3/10—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M3/145—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
- H02M3/155—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only
- H02M3/1555—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only for the generation of a regulated current to a load whose impedance is substantially inductive
Definitions
- the present invention relates to a switching type power supply device and a magnetic resonance imaging device using the same.
- the present invention relates to a magnetic field generating coil for a magnetic resonance imaging apparatus (hereinafter referred to as an MRI apparatus) requiring high current accuracy, a relatively high voltage of 1000 to 2000 V, 500 A, and a large current.
- the present invention relates to a switching type power supply device suitable for a gradient magnetic field or high frequency magnetic field generating coil and an MRI apparatus using the same.
- An object of the present invention is to provide a high-voltage, large-current switching-type power supply device with further reduced current ripple and an MRI device using the same. Disclosure of the invention
- the present invention provides a switching power supply, comprising: a first and a second multi-level switch having the same number of potential levels connected in parallel with each other with respect to a magnetic field generating coil of an MRI apparatus as a load;
- the switching control circuit which is composed of a PWM inverter and drives and controls the first and second multilevel PWM inverters, has a switching phase of the first and second multilevel PWM inverters.
- FIG. 1 is a block diagram of a power supply device for an MRI device according to an embodiment of the present invention.
- FIG. 2 is a circuit diagram of a multi-level diode clamp type PWM inverter used in the power supply device for the MRI device shown in FIG.
- FIG. 3 is an output waveform diagram of each voltage and current of the multi-level diode clamp type PWM inverter shown in FIG. 2 connected in parallel with each other, and an output current waveform diagram as a whole thereof.
- Fig. 4 is a characteristic diagram showing a comparison of the output current waveforms of a conventional two-level inverter and a five-level inverter.
- FIG. 5 is a block diagram showing the internal structure of the switching circuit 19 shown in FIG.
- FIG. 1 is a block diagram of a switching type power supply according to an embodiment of the present invention when applied to a gradient coil of an MRI apparatus.
- the power supply device 2 for the gradient magnetic field coil of the MRI device is configured to be supplied with electric power from the three-phase AC power supply 3, connected to the gradient magnetic field coil 1 as a load, and to supply current thereto.
- the power supply unit 2 for the gradient magnetic field coil of the MRI apparatus is connected to a three-phase AC power supply 3 and is connected to an AC / DC converter 4 for converting a three-phase AC voltage to a DC voltage, and to an output side of the AC / DC converter 4.
- the switching power supply 9 is composed of two multi-level PWM inverters 12 and 13 connected in parallel to a smoothing capacitor 5 as a DC voltage source on the input side, respectively, and the multi-level PWM inverter 12 , 13 connected to the output side, respectively, and their outputs are connected in series to the X-axis coil 6 of the gradient magnetic field coil 1 which is a load.
- the current limiting means 14 to 17 and the output of the switching power supply 9 are connected.
- the current detection means 18 for detecting current, the current command value from the sequencer 70 of the MRI device, and the current detection value output from the current detection means 18 are input so that the difference between the two becomes zero.
- a switching control circuit 19 for controlling the driving of the multi-level P WM inverters 1 2 and 13.
- the switching control circuit 19 includes two switching circuits connected in parallel. Shift the phase of switching Control function is provided to cancel out Nagareri ripple.
- the configuration of the switching power supplies 10 and 11 connected to the Y-axis coil 7 and the Z-axis coil 8 of the gradient magnetic field coil 1, respectively, is the same as that of the switching power supply 9 described above. And duplicate explanations are omitted.
- FIG. 2 is a circuit diagram of a five-level diode clamp type PWM inverter as an example of the multi-level PWM inverters 12 and 13.
- the 5-level diode clamp type PWM inverter has a DC voltage source E , EO are connected to output arbitrary voltage waveforms to their output terminals A and B.
- this 5-level diode-clamped PWM inverter connects the voltage dividing capacitors 20 to 23 to the DC voltage sources E and E0 to divide the DC voltage into four (E / 4).
- connection points of the voltage dividing capacitors 20, 21 and the semiconductor switches 321, 331, 341, 351, and the semiconductor switches 32, 332, 342, 342, 52 in the arms 32 to 35 of the full bridge configuration are shown.
- a diode 36-39 for voltage clamping is connected between the connection point and the connection point, and a connection point between the voltage dividing capacitors 21 and 22 and a semiconductor switch 32 2 in each arm 32 to 35 are connected.
- 3332, 342, 3552 and the connection points of the semiconductor switches 323, 3333, 343, 3553, respectively are connected with voltage-clamping diodes 40 to 43, respectively.
- Voltage clamping diode 4 4 between the connection point of voltage dividing capacitors 22 and 23 and the connection point of semiconductor switches 323, 333, 343, 353 and semiconductor switches 324, 334, 344, 354 To 47 are connected.
- the switching control circuit 19 can output a voltage of + E to the output terminal A by turning on the semiconductor switches 321 to 324 of the arm 32, and the semiconductor switches 322 to 324 of the arm 32 and the arm 33.
- + E ⁇ 3Z4 voltage can be output to the output terminal A by conducting the semiconductor switch 3 31 of the arm 3 and the semiconductor switches 3 3 1 and 3 3 2 of the arm 3 2
- the voltage of + E1 / 2 can be output to the output terminal A by applying the voltage, and the semiconductor switch 324 of the arm 32 and the semiconductor switches 331 to 333 of the arm 33 are made conductive, so that + E is output to the output terminal A.
- a voltage of / 4 can be output, and a voltage of 0 can be output to the output terminal A by turning on the semiconductor switches 331 to 334 of the arm 33. Is obtained.
- a voltage of + E can be output to the output terminal B by conducting the semiconductor switches 341-134 of the arm 34, and the semiconductor switch 3424 of the arm 34 can be output.
- 3 3 4 4 and the semiconductor switch 3 51 of the arm 3 5 can be made conductive to output a voltage of + E 3/4 to the output terminal B.
- the semiconductor switch 3 4 3, 344 of the arm 3 4 and the arm 3 By conducting the semiconductor switches 3 5 1 and 3 52 of FIG. 5, a voltage of + E ⁇ 1Z2 can be output to the output terminal B, and the semiconductor switches 3 4 4 of the arm 3 4 and the semiconductor switches 3 5 of the arm 3 5 can be output.
- a voltage of + E / 4 can be output to the output terminal B by conducting 1 to 35 3 and a voltage of 0 is output to the output terminal B by conducting the semiconductor switches 35 1 to 35 4 of the arm 35. , And a five-level voltage output is also obtained at output terminal B. Therefore, if we look at the voltage difference between the output terminals A and B, we can see that — E, -E / 4, -E / 2,-E-3/4, 0, + E ⁇ 3/4, + E / 2 , + E4, + E.
- the multi-level PWM inverters 12 and 13 divide the DC voltage source by voltage dividing capacitors 20 to 23, and the semiconductor switches 32 1 to 3 24 and 33 1 to 33 of each arm 32 to 35 are provided. 4, 34 1 to 3 44, 3 5 1 to 3 5 4 are divided in the same way, and by connecting voltage clamping diodes 36 to 47, respectively, each semiconductor switch 32 1 to 3 24, 3 3 1—3 3 4, 3 4 1 to 3 44, 3 5 1 to 3 54 Only a divided DC voltage is applied, so a large output can be obtained even if a semiconductor switch with low withstand voltage is used. Voltage is obtained.
- the switching power supplies 9 to 11 serving as current amplifiers use the multi-level PWM inverters 12 and 13, respectively, the current ripple can be reduced as compared with the case where the conventional two-level PWM inverter is used. it can.
- Figure 4 shows the conventional two-level inverter and the five-level inverter It is a schematic waveform diagram of the voltage and current in the inverter.
- the output current waveform 50 of the conventional two-level inverter is obtained from two positive and negative potentials as shown as the output voltage waveform 51, the current changes sharply when the voltage shown by the output voltage waveform 51 is applied. As a result, the current ripple is increasing.
- the output current waveform 52 of the conventional five-level inverter is obtained from five potentials as shown in the output voltage waveform 53, the current change due to the five potentials shown in the output voltage waveform 53 is very small. And the current ripple is smaller than that of the conventional two-level inverter.
- the multi-level diode clamp type PWM members 12 and 13 which are connected in parallel are used.
- Current control means 14 to 17 such as reactors are connected in series with the load on the output side.
- the switching control circuit 19 is provided with two multi-level diode clamps so that the difference between the current command value from the sequencer 70 and the current detection value by the current detection means 18 becomes zero. It has a control function of controlling the drive by shifting the switching phase between the type PWM inverters 12 and 13.
- FIG. 5 is a schematic diagram of a control circuit that operates with a switching phase shifted by 180 degrees as an example of the switching control circuit 19.
- the control circuit 19 receives the current command value and the current detection value, and outputs a PWM signal A and a PWM signal B that operate with the switching phases shifted 180 degrees from each other.
- the current command value and the current detection value are input to the feedback calculator 61.
- the feedback calculator 61 calculates the difference between the current command value and the detected current value to be zero and outputs a control amount.
- the basic clock In the generating means 62 a basic clock having a duty 50% and a frequency equal to the switching frequency is generated, and its output is output to another sawtooth generating means 6 via the sawtooth generating means 63 and the logic inverter 64. Connected to 5.
- the sawtooth wave generating means 63 and 65 generate sawtooth waves 180 degrees out of phase, respectively, and output them to the comparators 66 and 67.
- the comparators 66 and 67 receive the sawtooth waves from the sawtooth wave generating means 63 and 65 and the control amount from the feedback calculator 61, compare them, and compare the PWM signal A and the PWM signal B with each other. Output.
- Figure 3 shows the voltage output waveforms when using a 5-level diode-clamp-type PWM inverter as the multi-level PWM inverters 12 and 13 and performing PWM control with the switching phase shifted 180 degrees between the two.
- 48A and 48B and current output waveforms 49A and 49B are shown.
- Reference numeral 49 denotes the overall output current waveform obtained by superimposing the output current waveforms 49A and 49B. By shifting the switching phases of both inverters, the overall current ripple is significantly reduced. Minute to be.
- the 5-level diode-clamped PWM inverter can operate with a lower ripple than the 2-level inverter, as described in Fig. 4, but the output waveform still remains A slight current ripple is seen with the change of 48 A and 48 B.
- the switching control circuit 19 of the present invention provides a switching phase between the two multi-level PWM inverters 12 and 13 so that the difference between the current command value and the current detection value by the current detection means 18 becomes zero.
- the current ripples between the multi-level PWM inverters 12 and 13 with 180 ° phase shift cancel each other out and have a significantly low ripple current. You can get the output. It is desirable to shift the phase by 180 degrees, but the present invention is not limited to this, and can be obtained by substantially shifting the switching phase between the two multilevel PWM inverters 12 and 13.
- the present invention is not limited to this.
- the number of semiconductor switches increases and the size increases.
- an example using MOS FET as a semiconductor switch has been described, but a bipolar transistor, an IGBT, a GTO, a thyristor, or the like can be used.
- the multilevel PWM inverters 1, 2 and 3 have been described as having two sets of parallel connections with a phase shift of 180 degrees.However, if the phases are substantially different in multiple parallel connections, current ripple can be reduced. it can. Further, the current limiting means 14 to 17 have been described as a rear turtle, but they may be resistors. The method is not limited as long as it works as a DC voltage source that applies a DC voltage to the device. Further, the switching type power supply connected to the gradient magnetic field coil 1 of the MRI apparatus has been described as a load, but a coil for generating a static magnetic field or a high-frequency magnetic field can be connected and used as a load.
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Physics & Mathematics (AREA)
- Condensed Matter Physics & Semiconductors (AREA)
- General Physics & Mathematics (AREA)
- Magnetic Resonance Imaging Apparatus (AREA)
- Inverter Devices (AREA)
Abstract
Description
Claims
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US10/542,796 US20060114623A1 (en) | 2003-02-12 | 2004-02-06 | Switching type power source device and magnetio resonance imaging device using the same |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2003033173A JP2004266884A (ja) | 2003-02-12 | 2003-02-12 | スイッチング電源式電源装置およびそれを用いた核磁気共鳴イメージング装置 |
JP2003-33173 | 2003-02-12 |
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WO2004071296A1 true WO2004071296A1 (ja) | 2004-08-26 |
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PCT/JP2004/001292 WO2004071296A1 (ja) | 2003-02-12 | 2004-02-06 | スイッチング式電源装置及びそれを用いた磁気共鳴イメージング装置 |
Country Status (4)
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US (1) | US20060114623A1 (ja) |
JP (1) | JP2004266884A (ja) |
CN (1) | CN1744855A (ja) |
WO (1) | WO2004071296A1 (ja) |
Families Citing this family (21)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP4698305B2 (ja) * | 2005-07-05 | 2011-06-08 | 株式会社日立メディコ | 電源装置及びこれを用いた磁気共鳴イメージング装置 |
FR2942088B1 (fr) * | 2009-02-11 | 2011-03-11 | Converteam Technology Ltd | Onduleur de tension a 3n-4 niveaux |
EP2234263A1 (en) | 2009-03-27 | 2010-09-29 | Koninklijke Philips Electronics N.V. | A power supply, method, and computer program product for supplying electrical power to a load |
IT1393717B1 (it) * | 2009-03-31 | 2012-05-08 | Meta System Spa | Dispositivo e metodo per la conversione di corrente continua in corrente alternata |
JP5727317B2 (ja) * | 2010-07-16 | 2015-06-03 | ジャパンスーパーコンダクタテクノロジー株式会社 | 超電導コイルの電源装置 |
WO2013080465A1 (ja) * | 2011-11-30 | 2013-06-06 | パナソニック 株式会社 | インバータ装置の制御方法及びインバータ装置 |
US9389288B2 (en) | 2012-09-14 | 2016-07-12 | General Electric Company | System and method for maintaining soft switching condition in a gradient coil driver circuit |
US9641099B2 (en) * | 2013-03-15 | 2017-05-02 | Sparq Systems Inc. | DC-AC inverter with soft switching |
DE102013212426A1 (de) * | 2013-06-27 | 2014-12-31 | Siemens Aktiengesellschaft | Umrichteranordnung mit parallel geschalteten Mehrstufen-Umrichtern sowie Verfahren zu deren Steuerung |
CN104518664B (zh) * | 2013-09-29 | 2017-10-03 | 西门子(深圳)磁共振有限公司 | 一种磁共振成像系统及其线圈控制装置 |
NL2011648C2 (en) * | 2013-10-18 | 2015-04-23 | Prodrive B V | Switched power converter. |
US9584034B2 (en) | 2014-09-08 | 2017-02-28 | Infineon Technologies Austria Ag | Power converter circuit and method with asymmetrical half bridge |
US9762134B2 (en) | 2014-09-08 | 2017-09-12 | Infineon Technologies Austria Ag | Multi-cell power conversion method and multi-cell power converter |
US9837921B2 (en) | 2014-09-08 | 2017-12-05 | Infineon Technologies Austria Ag | Multi-cell power conversion method and multi-cell power converter |
US9929662B2 (en) * | 2014-09-08 | 2018-03-27 | Infineon Technologies Austria Ag | Alternating average power in a multi-cell power converter |
CN105703726B (zh) * | 2014-11-28 | 2021-04-20 | Ge医疗系统环球技术有限公司 | 功率放大器、电源装置和磁共振成像设备 |
US10033263B2 (en) * | 2015-06-26 | 2018-07-24 | Board Of Trustees Of Michigan State University | System and method for optimizing fundamental frequency modulation for a cascaded multilevel inverter |
JP6796392B2 (ja) * | 2016-04-14 | 2020-12-09 | 株式会社日立製作所 | 3レベル電力変換装置 |
US20190319549A1 (en) | 2016-11-16 | 2019-10-17 | Schneider Electric Solar Inverters Usa, Inc. | Interleaved parallel inverters with integrated filter inductor and interphase transformer |
US10557901B2 (en) | 2018-02-21 | 2020-02-11 | General Electric Company | Systems and methods for providing gradient power for an MRI system |
CN208725724U (zh) * | 2018-04-28 | 2019-04-12 | 西门子(深圳)磁共振有限公司 | 磁共振成像设备的电源供给系统及磁共振成像设备 |
Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH0956693A (ja) * | 1995-08-29 | 1997-03-04 | Hitachi Medical Corp | 磁気共鳴イメージング装置 |
JPH11220886A (ja) * | 1997-11-25 | 1999-08-10 | Denso Corp | マルチレベル形電力変換器 |
JP2002204579A (ja) * | 2001-01-09 | 2002-07-19 | Fuji Electric Co Ltd | インバータの制御方法 |
Family Cites Families (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH0330756A (ja) * | 1989-06-29 | 1991-02-08 | Toshiba Corp | 磁気共鳴イメージング装置 |
-
2003
- 2003-02-12 JP JP2003033173A patent/JP2004266884A/ja active Pending
-
2004
- 2004-02-06 CN CNA2004800033739A patent/CN1744855A/zh active Pending
- 2004-02-06 US US10/542,796 patent/US20060114623A1/en not_active Abandoned
- 2004-02-06 WO PCT/JP2004/001292 patent/WO2004071296A1/ja active Application Filing
Patent Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH0956693A (ja) * | 1995-08-29 | 1997-03-04 | Hitachi Medical Corp | 磁気共鳴イメージング装置 |
JPH11220886A (ja) * | 1997-11-25 | 1999-08-10 | Denso Corp | マルチレベル形電力変換器 |
JP2002204579A (ja) * | 2001-01-09 | 2002-07-19 | Fuji Electric Co Ltd | インバータの制御方法 |
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Publication number | Publication date |
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CN1744855A (zh) | 2006-03-08 |
US20060114623A1 (en) | 2006-06-01 |
JP2004266884A (ja) | 2004-09-24 |
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