کنفرانس مهندسی برق ایران

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 Shahrbabaki¹ Reza Beiranvand²

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

Stable Target Tracking in Wireless Sensor Networks Under Malicious Cyber Attacks

Jafar Akhondali - Mohammad Taheri

A 400 ps Input Time Range 2× Time Amplifier Using Time-to-Current Compensation Technique

Mohammad Amin Yaldagard - Hossein Shamsi

Optimal D2D Resource Allocation in Heterogeneous Cellular Networks by Decentralized Multi-Agent Deep Q-Learning

Pouya Akhoundzadeh - Ghasem Mirjalily - Mohammad taghi Sadeghi

Energy-aware Multiple Access Using Deep Reinforcement Learning

Hamid Reza Mazandarani - Siavash Khorsandi

Non-homogeneous interference suppression in OFDM array radars using direct data domain approach

Sima Shariatmadari

Designing a delay line independent of PVT (Process, Voltage, Temperature) and applying it to a TDC (Time to Digital Converter)

Sepehr Zare Teimoori - Mehdi Ehsanian

Sampled-data-based Descriptor Observer Design with Aperiodic Measurements for Lithium-ion Batteries in Hybrid Electric Vehicles

Hamid Reza Ahmadzadeh - Masoud Shafiee

بهبود تخصیص منابع لبه‌ها در شبکه LTE مبتنی بر محاسبات لبه با رویکرد تعادل میان تاخیر و قابلیت اطمینان

ایمان عظیمی احمدآبادی - علی اکبر تدین تفت

Design and fabrication tip tapered fiber optic dopamine sensor based on LSPR

Roksana Esmaeilpour - Mohammad Ismail zibaii - Masoumeh Barkand - Marzieh Pajouhandeh - Soroush Rostami - Mehdi Banihashemi - Mohammad-Mahdi Babakhani-fard

Modeling of seawater desalination by reverse osmosis method powered by wind turbine

Bahareh Iranmanesh - Gholam Hossein Riahy Dehkordi

ثمین همایش، سامانه مدیریت کنفرانس ها و جشنواره ها - نگارش 40.4.2