FI75701B - Kontrollerad stroemkaella. - Google Patents
Kontrollerad stroemkaella. Download PDFInfo
- Publication number
- FI75701B FI75701B FI831389A FI831389A FI75701B FI 75701 B FI75701 B FI 75701B FI 831389 A FI831389 A FI 831389A FI 831389 A FI831389 A FI 831389A FI 75701 B FI75701 B FI 75701B
- Authority
- FI
- Finland
- Prior art keywords
- current
- power supply
- voltage
- load
- capacitor
- Prior art date
Links
Classifications
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03K—PULSE TECHNIQUE
- H03K3/00—Circuits for generating electric pulses; Monostable, bistable or multistable circuits
- H03K3/02—Generators characterised by the type of circuit or by the means used for producing pulses
- H03K3/53—Generators characterised by the type of circuit or by the means used for producing pulses by the use of an energy-accumulating element discharged through the load by a switching device controlled by an external signal and not incorporating positive feedback
- H03K3/57—Generators characterised by the type of circuit or by the means used for producing pulses by the use of an energy-accumulating element discharged through the load by a switching device controlled by an external signal and not incorporating positive feedback the switching device being a semiconductor device
-
- 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
- H03—ELECTRONIC CIRCUITRY
- H03K—PULSE TECHNIQUE
- H03K17/00—Electronic switching or gating, i.e. not by contact-making and –breaking
- H03K17/51—Electronic switching or gating, i.e. not by contact-making and –breaking characterised by the components used
- H03K17/56—Electronic switching or gating, i.e. not by contact-making and –breaking characterised by the components used by the use, as active elements, of semiconductor devices
- H03K17/687—Electronic switching or gating, i.e. not by contact-making and –breaking characterised by the components used by the use, as active elements, of semiconductor devices the devices being field-effect transistors
- H03K17/6871—Electronic switching or gating, i.e. not by contact-making and –breaking characterised by the components used by the use, as active elements, of semiconductor devices the devices being field-effect transistors the output circuit comprising more than one controlled field-effect transistor
Landscapes
- Physics & Mathematics (AREA)
- Condensed Matter Physics & Semiconductors (AREA)
- General Physics & Mathematics (AREA)
- Magnetic Resonance Imaging Apparatus (AREA)
- Continuous-Control Power Sources That Use Transistors (AREA)
- Control Of Voltage And Current In General (AREA)
- Generation Of Surge Voltage And Current (AREA)
Claims (6)
1. Styrd strömkälla med en induktiv belastning, speciellt en för en kärnspinnbildsanordning lämplig gradientspole, kännetecknad av, att strömkretsen har energi-lagrande medel (2), som styrbart kopplats parallellt med strömkällan (1) och den induktiva belastningen (3) för att oka den i nämnda induktiva belastning (3) lagrade energi-förändringshastigheten och styrning av de nämnda energi-lagrande medlen (2) sker med tillhjälp av medel (6), som avkänner sirommen i den induktiva belastningen.
2. Strömkälla enligt patentkrav 1, kännetecknad av, att de nämnda energilagrande medlen (2) omfattar kon-densatormedel (C1, C2, C3) samt kopplingsmedel (F1...F4; P5..oP10), som anordnats att styras, dä. strömmen snabbt skall ändras tili större än dess egenvärde, nämnda kopplingsmedel (F1...F4J F5...F10) överför en del av den i nämnda kondensa-tormedel (Cl, 02, C3) reserverade energin tili nämnda induktiva belastning (3)» och d& strömmen blir oförändrad eller längsamt förändras, styr nämnda kopplingsmedel (F1...F4; P5..«P10) strömbanan förbi nämnda kondensatormedel (C1, C2, C3) .
3. Strömkälla enligt patentkrav 2, kännetecknad av, att nämnda kondensatormedel omfattar en första kondensa-tor (C1) för den hastigt i positiv riktning ökande strömmen och en andra kondensator (C2) för den hastigt i negativ riktning ökande strömmen.
4. Strömkälla enligt patentkrav 2, kännetecknad av, att nämnda kondensatormedel omfattar en kondensator (C3)* som, d& snabb ändring av strömmen erfordras, anordnats att kopplas tili strömbanan i oiikä riktningar beroende pä, huruvida strömmen ökar i positiv eller negativ riktning.
Priority Applications (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FI831389A FI75701C (sv) | 1983-04-22 | 1983-04-22 | Kontrollerad strömkälla. |
US06/601,952 US4668904A (en) | 1983-04-22 | 1984-04-19 | Controlled source of current |
DE3415041A DE3415041C2 (de) | 1983-04-22 | 1984-04-21 | Stromversorgungsschaltung für eine Spule |
JP59081667A JPS6046780A (ja) | 1983-04-22 | 1984-04-23 | 電流源装置 |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FI831389 | 1983-04-22 | ||
FI831389A FI75701C (sv) | 1983-04-22 | 1983-04-22 | Kontrollerad strömkälla. |
Publications (4)
Publication Number | Publication Date |
---|---|
FI831389A0 FI831389A0 (fi) | 1983-04-22 |
FI831389L FI831389L (fi) | 1984-10-23 |
FI75701B true FI75701B (fi) | 1988-03-31 |
FI75701C FI75701C (sv) | 1988-07-11 |
Family
ID=8517094
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
FI831389A FI75701C (sv) | 1983-04-22 | 1983-04-22 | Kontrollerad strömkälla. |
Country Status (4)
Country | Link |
---|---|
US (1) | US4668904A (sv) |
JP (1) | JPS6046780A (sv) |
DE (1) | DE3415041C2 (sv) |
FI (1) | FI75701C (sv) |
Families Citing this family (15)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FI80795C (sv) * | 1988-07-01 | 1990-07-10 | Instrumentarium Oy | Förfarande och anordning för undersökning av ämnens egenskaper |
DE3910058A1 (de) * | 1989-03-28 | 1990-10-04 | Siemens Ag | Anordnung zum herstellen von schnittbildern mit einem kernspintomographen und verfahren zum betrieb der anordnung |
US4961054A (en) * | 1989-07-06 | 1990-10-02 | General Electric Company | Gradient current speed-up circuit for high-speed NMR imaging system |
EP0429715B1 (de) * | 1989-12-01 | 1996-07-10 | Siemens Aktiengesellschaft | Verfahren zum Betrieb eines Kernspintomographiegeräts mit einem Resonanzkreis zur Erzeugung von Gradientenfeldern |
EP0533786A4 (en) * | 1990-06-13 | 1993-07-21 | Advanced Nmr Systems, Inc. | Circuitry for driving field-generating coil of magnetic resonance imaging system |
DE4127529C2 (de) * | 1991-08-20 | 1995-06-08 | Siemens Ag | Verfahren zum Betrieb eines Kernspintomographiegeräts mit einem Resonanzkreis zur Erzeugung von Gradientenfeldern |
US5270657A (en) * | 1992-03-23 | 1993-12-14 | General Electric Company | Split gradient amplifier for an MRI system |
FI92970C (sv) * | 1992-12-01 | 1995-02-10 | Picker Nordstar Oy | Metod för att avbilda ett materials rörelse |
FI95625C (sv) * | 1993-03-10 | 1996-02-26 | Picker Nordstar Oy | Avbildningsförfarande |
DE19511833C2 (de) * | 1995-03-30 | 1998-04-23 | Siemens Ag | Gradientenstromversorgung für ein Kernspintographiegerät |
US6552448B1 (en) | 1999-09-08 | 2003-04-22 | Harman International Industries, Incorporated | Energy management system for series connected amplifiers |
US6504426B2 (en) * | 2001-03-28 | 2003-01-07 | Guy Picha | Methods and systems for power amplifying of signals |
US6920312B1 (en) | 2001-05-31 | 2005-07-19 | Lam Research Corporation | RF generating system with fast loop control |
DE10334079B4 (de) * | 2003-07-25 | 2008-08-21 | Siemens Ag | Transistormodul |
US7116168B2 (en) * | 2004-12-01 | 2006-10-03 | Creative Technology Ltd | Power multiplier system and method |
Family Cites Families (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3643129A (en) * | 1970-11-30 | 1972-02-15 | Gen Motors Corp | Solenoid control apparatus |
JPS5335895A (en) * | 1976-09-16 | 1978-04-03 | Japan Atom Energy Res Inst | High voltage generating system |
DE3112280A1 (de) * | 1981-03-27 | 1982-10-07 | Siemens AG, 1000 Berlin und 8000 München | Vorrichtung zur spulenerregung fuer die erzeugung pulsfoermiger felder konstanter staerke |
JPS58192537A (ja) * | 1982-05-07 | 1983-11-10 | 株式会社日立製作所 | 核磁気共鳴を用いた検査装置 |
-
1983
- 1983-04-22 FI FI831389A patent/FI75701C/sv not_active IP Right Cessation
-
1984
- 1984-04-19 US US06/601,952 patent/US4668904A/en not_active Expired - Lifetime
- 1984-04-21 DE DE3415041A patent/DE3415041C2/de not_active Expired - Fee Related
- 1984-04-23 JP JP59081667A patent/JPS6046780A/ja active Pending
Also Published As
Publication number | Publication date |
---|---|
FI831389A0 (fi) | 1983-04-22 |
FI831389L (fi) | 1984-10-23 |
US4668904A (en) | 1987-05-26 |
DE3415041C2 (de) | 1996-05-23 |
DE3415041A1 (de) | 1984-10-25 |
JPS6046780A (ja) | 1985-03-13 |
FI75701C (sv) | 1988-07-11 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
MM | Patent lapsed |
Owner name: INSTRUMENTARIUM OY |