DocumentCode
330949
Title
High precision current tracking PWM amplifier with optimal type 1 digital controller for generating magnetic field in MRI systems
Author
Watanabe, S. ; Boyagoda, P. ; Nakaoka, M.
Author_Institution
Yamaguchi Univ., Japan
fYear
1998
fDate
21-23 Sep 1998
Firstpage
437
Lastpage
441
Abstract
This paper presents a two-paralleled PWM amplifier using switch-mode power current tracking technique in order to generate a gradient magnetic field in a magnetic resonance imaging (MRI) system. This circuit has 8-IGBTs at their inputs/outputs so as to realize further high-power density. A digital control scheme can minimize the current ripple and improve its control response in the gradient coils. It is proved that the proposed technique will highly enlarge the diagnostic target and improve the image quality of MRI
Keywords
power amplifiers; IGBTs; MRI; control response; current ripple; diagnostic target; digital control scheme; gradient coils; image quality; magnetic field generation; magnetic resonance imaging; power density; switch-mode power current tracking technique; two-paralleled PWM amplifier;
fLanguage
English
Publisher
iet
Conference_Titel
Power Electronics and Variable Speed Drives, 1998. Seventh International Conference on (Conf. Publ. No. 456)
Conference_Location
London
ISSN
0537-9989
Print_ISBN
0-85296-704-7
Type
conf
DOI
10.1049/cp:19980565
Filename
732085
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