JP6965077B2 - インバータ装置、傾斜磁場電源、及び磁気共鳴イメージング装置 - Google Patents
インバータ装置、傾斜磁場電源、及び磁気共鳴イメージング装置 Download PDFInfo
- Publication number
- JP6965077B2 JP6965077B2 JP2017185292A JP2017185292A JP6965077B2 JP 6965077 B2 JP6965077 B2 JP 6965077B2 JP 2017185292 A JP2017185292 A JP 2017185292A JP 2017185292 A JP2017185292 A JP 2017185292A JP 6965077 B2 JP6965077 B2 JP 6965077B2
- Authority
- JP
- Japan
- Prior art keywords
- freewheeling diode
- magnetic field
- load
- load control
- inverter device
- 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.)
- Active
Links
Images
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
- H02M1/00—Details of apparatus for conversion
- H02M1/08—Circuits specially adapted for the generation of control voltages for semiconductor devices incorporated in static converters
- H02M1/088—Circuits specially adapted for the generation of control voltages for semiconductor devices incorporated in static converters for the simultaneous control of series or parallel connected semiconductor devices
-
- 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
- H02M1/32—Means for protecting converters other than automatic disconnection
-
- 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
- H02M7/53—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 using devices of a triode or transistor type requiring continuous application of a control signal
- H02M7/537—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 using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only, e.g. single switched pulse inverters
-
- 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
- H02M1/0003—Details of control, feedback or regulation circuits
- H02M1/0009—Devices or circuits for detecting current in a converter
-
- 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
- H02M1/32—Means for protecting converters other than automatic disconnection
- H02M1/327—Means for protecting converters other than automatic disconnection against abnormal temperatures
-
- 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
- H02M7/53—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 using devices of a triode or transistor type requiring continuous application of a control signal
- H02M7/537—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 using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only, e.g. single switched pulse inverters
- H02M7/5387—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 using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only, e.g. single switched pulse inverters in a bridge configuration
- H02M7/53871—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 using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only, e.g. single switched pulse inverters in a bridge configuration with automatic control of output voltage or current
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Physics & Mathematics (AREA)
- Condensed Matter Physics & Semiconductors (AREA)
- General Physics & Mathematics (AREA)
- Inverter Devices (AREA)
- Magnetic Resonance Imaging Apparatus (AREA)
Description
図1は、第1の実施形態に係るMRI装置100の構成例を示す図である。例えば、図1に示すように、本実施形態に係るMRI装置100は、静磁場磁石1、傾斜磁場コイル2、傾斜磁場電源3、送信コイル4、送信回路5、受信コイル6、受信回路7、架台8、寝台9、入力インタフェース10、ディスプレイ11、記憶回路12、及び、処理回路13〜16を備える。
なお、上述した第1の実施形態では、負荷制御機能25aが、各スイッチング素子に含まれる還流ダイオードに流れる電流を監視して、各還流ダイオードの負荷を制御する場合の例を説明したが、実施形態はこれに限られない。
3 傾斜磁場電源
20 インバータ装置
21AH、21AL、21BH、21BL、22AH、22AL、22BH、22BL スイッチング素子
25 処理回路
25a 負荷制御機能
Claims (9)
- 互いに並列に接続され、それぞれトランジスタ及び当該トランジスタに逆並列に接続された還流ダイオードを含む複数のスイッチング素子と、
各スイッチング素子に含まれる還流ダイオードに流れる電流又は当該還流ダイオードの温度を監視し、前記電流又は前記温度に基づいて、前記スイッチング素子間における還流ダイオードの負荷の不均衡が抑制されるように、各還流ダイオードの特性を管理する負荷制御部と
を備える、インバータ装置。 - 前記負荷制御部は、各還流ダイオードの特性を管理することで、各還流ダイオードの損失の偏りを抑制する、
請求項1に記載のインバータ装置。 - 前記負荷制御部は、各スイッチング素子に含まれるトランジスタのスイッチング動作におけるdV/dtを制御することで、間接的に前記還流ダイオードの損失を制御する、
請求項2に記載のインバータ装置。 - 前記負荷制御部は、各スイッチング素子に含まれるトランジスタのゲート抵抗を制御することで、前記dV/dtを制御する、
請求項3に記載のインバータ装置。 - 前記複数のスイッチング素子は、同じ特性の還流ダイオードが組み合わされて構成されている、
請求項1〜4のいずれか一つに記載のインバータ装置。 - 前記負荷制御部は、前記還流ダイオードに流れる電流として、当該還流ダイオードの逆回復電流又は順電流を監視する、
請求項1〜5のいずれか一つに記載のインバータ装置。 - 前記負荷制御部は、前記還流ダイオードの温度として、前記スイッチング素子のジャンクション温度又はケース温度を監視する、
請求項1〜6のいずれか一つに記載のインバータ装置。 - 磁気共鳴イメージング装置で用いられる傾斜磁場コイルに傾斜磁場の波形に応じた電圧を出力するインバータ装置を備え、
前記インバータ装置は、
互いに並列に接続され、それぞれトランジスタ及び当該トランジスタに逆並列に接続された還流ダイオードを含む複数のスイッチング素子と、
各スイッチング素子に含まれる還流ダイオードに流れる電流又は当該還流ダイオードの温度を監視し、前記電流又は前記温度に基づいて、前記スイッチング素子間における還流ダイオードの負荷の不均衡が抑制されるように、各還流ダイオードの特性を管理する負荷制御部と
を有する、傾斜磁場電源。 - 被検体が配置される撮像空間に傾斜磁場を印加する傾斜磁場コイルと、
前記傾斜磁場の波形に応じた電圧を前記傾斜磁場コイルに出力するインバータ装置を有する傾斜磁場電源を備え、
前記インバータ装置は、
互いに並列に接続され、それぞれトランジスタ及び当該トランジスタに逆並列に接続された還流ダイオードを含む複数のスイッチング素子と、
各スイッチング素子に含まれる還流ダイオードに流れる電流又は当該還流ダイオードの温度を監視し、前記電流又は前記温度に基づいて、前記スイッチング素子間における還流ダイオードの負荷の不均衡が抑制されるように、各還流ダイオードの特性を管理する負荷制御部と
を有する、磁気共鳴イメージング装置。
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2017185292A JP6965077B2 (ja) | 2017-09-26 | 2017-09-26 | インバータ装置、傾斜磁場電源、及び磁気共鳴イメージング装置 |
US15/929,045 US10910939B2 (en) | 2017-09-26 | 2018-09-20 | Inverter device, gradient amplifier, and magnetic resonance imaging device |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2017185292A JP6965077B2 (ja) | 2017-09-26 | 2017-09-26 | インバータ装置、傾斜磁場電源、及び磁気共鳴イメージング装置 |
Publications (2)
Publication Number | Publication Date |
---|---|
JP2019058341A JP2019058341A (ja) | 2019-04-18 |
JP6965077B2 true JP6965077B2 (ja) | 2021-11-10 |
Family
ID=65806848
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP2017185292A Active JP6965077B2 (ja) | 2017-09-26 | 2017-09-26 | インバータ装置、傾斜磁場電源、及び磁気共鳴イメージング装置 |
Country Status (2)
Country | Link |
---|---|
US (1) | US10910939B2 (ja) |
JP (1) | JP6965077B2 (ja) |
Families Citing this family (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP7076993B2 (ja) * | 2017-12-06 | 2022-05-30 | キヤノンメディカルシステムズ株式会社 | 傾斜磁場電源及び磁気共鳴イメージング装置 |
US10742110B1 (en) * | 2019-06-24 | 2020-08-11 | General Electric Company | System and method for operating a power converter to improve IGBT reliability |
Family Cites Families (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP3075303B2 (ja) | 1991-09-06 | 2000-08-14 | 株式会社安川電機 | 電力用半導体素子の保護方式 |
JP3588169B2 (ja) * | 1995-08-29 | 2004-11-10 | 株式会社日立メディコ | 磁気共鳴イメージング装置 |
JP2005143232A (ja) | 2003-11-07 | 2005-06-02 | Yaskawa Electric Corp | 電力半導体素子の保護方式 |
JP5338868B2 (ja) * | 2011-07-14 | 2013-11-13 | トヨタ自動車株式会社 | 駆動装置およびそれを搭載する車両、ならびに駆動装置の制御方法 |
JP2014023312A (ja) * | 2012-07-19 | 2014-02-03 | Toyota Industries Corp | モータインバータ |
US10302719B2 (en) * | 2014-11-11 | 2019-05-28 | Koninklijke Philips N.V. | Gradient amplifier system in a MRI system and method for supplying current using the system |
-
2017
- 2017-09-26 JP JP2017185292A patent/JP6965077B2/ja active Active
-
2018
- 2018-09-20 US US15/929,045 patent/US10910939B2/en active Active
Also Published As
Publication number | Publication date |
---|---|
US20190097519A1 (en) | 2019-03-28 |
JP2019058341A (ja) | 2019-04-18 |
US10910939B2 (en) | 2021-02-02 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
US10989776B2 (en) | Magnetic coil power methods and apparatus | |
US10338172B2 (en) | Power device and method for driving a load | |
US10024935B2 (en) | MRI gradient amplifier operable at different slew rates | |
US9551767B2 (en) | System and method to reduce power loss in a gradient amplifier | |
JP4732021B2 (ja) | 高忠実度で高出力の切り替え式増幅器 | |
US9389288B2 (en) | System and method for maintaining soft switching condition in a gradient coil driver circuit | |
US9222997B2 (en) | Gradient coil power supply and a magnetic resonance imaging system | |
JP6965077B2 (ja) | インバータ装置、傾斜磁場電源、及び磁気共鳴イメージング装置 | |
US6900638B1 (en) | Switching device to linearly conduct a current between a gradient amplifier and a gradient coil assembly of an MRI system | |
JP6662624B2 (ja) | 磁気共鳴イメージング装置及び傾斜磁場電源装置 | |
US10877117B2 (en) | Gradient amplifier | |
JP7062524B2 (ja) | インバータ装置、傾斜磁場電源、及び磁気共鳴イメージング装置 | |
CN211698153U (zh) | 射频线圈的切换控制装置以及磁共振成像*** | |
CN109217845B (zh) | 脉冲电源***及其控制方法 | |
JP6479359B2 (ja) | コイル駆動装置および磁気共鳴イメージング装置 | |
JPWO2011083788A1 (ja) | 傾斜磁場電源装置およびこの制御方法、並びにこれを用いた核磁気共鳴イメージング装置 | |
JP7286338B2 (ja) | 高周波増幅装置および磁気共鳴イメージング装置 | |
CN109106369B (zh) | 磁共振成像装置 | |
JP6636223B1 (ja) | 傾斜磁場電源装置およびそれを備えた磁気共鳴画像診断装置 | |
JP2018046630A (ja) | 制御装置及び制御方法 |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
A621 | Written request for application examination |
Free format text: JAPANESE INTERMEDIATE CODE: A621 Effective date: 20200722 |
|
A977 | Report on retrieval |
Free format text: JAPANESE INTERMEDIATE CODE: A971007 Effective date: 20210624 |
|
A131 | Notification of reasons for refusal |
Free format text: JAPANESE INTERMEDIATE CODE: A131 Effective date: 20210706 |
|
A521 | Request for written amendment filed |
Free format text: JAPANESE INTERMEDIATE CODE: A523 Effective date: 20210830 |
|
TRDD | Decision of grant or rejection written | ||
A01 | Written decision to grant a patent or to grant a registration (utility model) |
Free format text: JAPANESE INTERMEDIATE CODE: A01 Effective date: 20210921 |
|
A61 | First payment of annual fees (during grant procedure) |
Free format text: JAPANESE INTERMEDIATE CODE: A61 Effective date: 20211020 |
|
R150 | Certificate of patent or registration of utility model |
Ref document number: 6965077 Country of ref document: JP Free format text: JAPANESE INTERMEDIATE CODE: R150 |