0% Complete
صفحه اصلی
/
بیست و نهمین کنفرانس مهندسی برق ایران
A New Gradient Driver with only a Single DC Voltage Source For Using In MRI Systems
نویسندگان :
Amirabbas Naghipour Shahrbabaki
1
Reza Beiranvand
2
1- دانشگاه تربیت مدرس
2- دانشگاه تربیت مدرس
کلمات کلیدی :
AC–DC power converters, gradient amplifiers, gradient driver, current source, MRI, pulsed power, multilevel inverter, power supplies
چکیده :
Magnetic Resonance Imaging (MRI) systems use a gradient field for space encoding. The gradient drivers must drive gradient coils with a high current, greater than 1kA, and a high voltage, greater than 2kV, for fast slew rate and fast imaging. These drivers use multi-level staked H-bridges with several isolated voltages and high switching frequency to achieve high voltage, high fidelity, and high current values. The MRI systems use power supplies (PS) to generate and regulate these isolated voltages from a power source provided by the power distribution unit (PDU). A typical waveform of the gradient unit results in pulse power up to ten times of the average power. Moreover, all the power chain must be designed to deliver peak power, properly. A new gradient driver with one dc source and two capacitors, as energy storage (ES), is proposed in this paper that can minimize the peak power and does not need several isolated dc voltage sources for each gradient driver. Thus, the PS unit can be eliminated from the power chain; and the gradient driver can connect directly to the PDU. A switching strategy is chosen for controlling the output current, which minimizes the power drawn from the capacitors. The proposed topology has been simulated under different conditions to verify its performance.
لیست مقالات
لیست مقالات بایگانی شده
Design of Dual-beam Orthogonal Circular Polarized Leaky-wave Holographic Antenna
Mohammad Amin Chaychizadeh - Nader Komjani
Intelligent Filter of $\mathcal{L}_{1}$ Adaptive Controller Using ANFIS System Optimized with Genetic Algorithm
Hossein Ahmadian - HeidarAli Talebi - Iman Sharifi
Denoising of the Diffusion Tensor Imaging Data Using k-Space Redundancy
Khashayar Esmaeilzadeh - Farzaneh Keyvanfard - Abbas Nasiraei Moghaddam
Photonic Crystal-based Plasmonic Biosensor with Low-cost and High-sensitivity Properties
Mahdieh Ahmadi Motlagh - Mahdieh Bozorgi - Mahmood Rafaei-Booket
Incentivizing Peer-to-Peer Energy Trading in Microgrids
Amir Noori - Babak Tavassoli - Alireza Fereidunian
An Iterative Post-processing Method for Speech Source Separation in Realistic Scenarios
Iman Shahriari - Hossein Zeinali
Design of a plasmonic MIM filter based on ring resonator incorporating circular air holes
Sara Gholinezhad Shafagh - Hassan Kaatuzian - Mohammad Danaie
اولویتبندی کلیدهای قدرت جهت پیادهسازی سیستم پایش وضعیت
محمدرضا قطبالدینی - احمد میرزائی - محمدمهدی منصوری مجومرد
Analysis of an E-core Permanent Magnet Switched Reluctance Motor
Ali Ghaffarpour - Mojtaba Mirsalim
پایدارسازی سیستم های چند ورودی-چند خروجی n-بعدی با استفاده از تساوی بزوت، تئوری متباین و نمایش کسری-ماتریسی سیستم
سعید پورمیرزایی - وحید صفری دهنوی - مسعود شفیعی
بیشتر
ثمین همایش، سامانه مدیریت کنفرانس ها و جشنواره ها - نگارش 42.0.4