FI75701B - Kontrollerad stroemkaella. - Google Patents

Kontrollerad stroemkaella. Download PDF

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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
Application number
FI831389A
Other languages
English (en)
Finnish (fi)
Other versions
FI831389A0 (fi
FI831389L (fi
FI75701C (sv
Inventor
Juhani Kupiainen
Original Assignee
Instrumentarium Oy
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Instrumentarium Oy filed Critical Instrumentarium Oy
Priority to FI831389A priority Critical patent/FI75701C/sv
Publication of FI831389A0 publication Critical patent/FI831389A0/fi
Priority to US06/601,952 priority patent/US4668904A/en
Priority to DE3415041A priority patent/DE3415041C2/de
Priority to JP59081667A priority patent/JPS6046780A/ja
Publication of FI831389L publication Critical patent/FI831389L/fi
Publication of FI75701B publication Critical patent/FI75701B/fi
Application granted granted Critical
Publication of FI75701C publication Critical patent/FI75701C/sv

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.
FI831389A 1983-04-22 1983-04-22 Kontrollerad strömkälla. FI75701C (sv)

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)

* Cited by examiner, † Cited by third party
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)

* Cited by examiner, † Cited by third party
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

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

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MM Patent lapsed

Owner name: INSTRUMENTARIUM OY