基于IGBT宏模型的PWM功率转换放大器在MRI系统中产生梯度磁场的分析

Proceedings of the IEEE 1999 International Conference on Power Electronics and Drive Systems. PEDS'99 (Cat. No.99TH8475) Pub Date : 1999-07-27 DOI:10.1109/PEDS.1999.794548

S. Watanabe, P. Boyagoda, M. Nakaoka, H. Takano

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引用次数: 8

摘要

为了在磁共振成像系统中产生梯度磁场，提出了一种采用开关电流跟踪技术的双并联PWM放大器。该电路的输入/输出有8个igbt，从而进一步实现高功率密度。采用数字控制方案可以减小梯度线圈中的电流纹波，提高其控制响应。实验证明，该方法能极大地扩大MRI的诊断目标，提高成像质量。

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Analysis on a PWM power conversion amplifier with IGBT macro model to generate gradient magnetic fields in MRI systems

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.

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Proceedings of the IEEE 1999 International Conference on Power Electronics and Drive Systems. PEDS'99 (Cat. No.99TH8475)

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