Title :
Analysis on a PWM power conversion amplifier with IGBT macro model to generate gradient magnetic fields in MRI systems
Author :
Watanabe, Shuji ; Boyagoda, Prasanna ; Nakaoka, Mutsuo ; Takano, Hiroshi
Author_Institution :
Yamaguchi Univ., Ube, Japan
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 the 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 (GCs). It is proved that the proposed technique will highly enlarge the diagnostic target and improve the image quality of MRI
Keywords :
PWM power convertors; biomedical MRI; choppers (circuits); digital control; electric current control; insulated gate bipolar transistors; magnetic fields; power amplifiers; power supplies to apparatus; IGBT macro model; MRI systems; PWM power conversion amplifier; control response improvement; current ripple minimisation; diagnostic target enlargement; digital control scheme; gradient coils; gradient magnetic field generation; gradient magnetic fields generation; high-power density; image quality improvement; magnetic resonance imaging system; switch-mode power current tracking; two-paralleled PWM amplifier; Insulated gate bipolar transistors; Magnetic analysis; Magnetic fields; Magnetic resonance imaging; Magnetic switching; Power amplifiers; Power conversion; Power generation; Power system modeling; Pulse width modulation;
Conference_Titel :
Power Electronics and Drive Systems, 1999. PEDS '99. Proceedings of the IEEE 1999 International Conference on
Print_ISBN :
0-7803-5769-8
DOI :
10.1109/PEDS.1999.794548
