Title page for ETD etd-093099-111035


Type of Document Master's Thesis
Author Qu, Dayu
Author's Email Address dqu@vt.edu
URN etd-093099-111035
Title EMI CHARACTERIZATION AND IMPROVEMENT OF BI-DIRECTIONAL DC/DC CONVERTERS
Degree Master of Science
Department Electrical Engineering
Advisory Committee
Advisor Name Title
Dr. Jason Lai Committee Chair
Dr. Alex Q. Huang Committee Member
Dr. Dan Y. Chen Committee Member
Keywords
  • L-type converter
  • bi-directional DC/DC converter
  • electric vehicle
  • soft-switching
  • full-bridge converter
  • EMI
Date of Defense 1999-09-14
Availability restricted
Abstract
A worldwide awareness of the environment is

accelerating fuel cell vehicle development.

With respect to power electronics, special

requirement is on the development of high

efficiency, high voltage ratio bi-directional

DC/DC converter for fuel cell energy system

management.

In this paper, two bi-directional DC/DC

converters, which are developed for Ford Motor

Company's fuel cell vehicle, are compared from

different aspects. Comparison is concentrated

on the circuit topology and EMI performance.

Emphasis is placed on soft-switch, hard-switch,

synchronized rectification, auxiliary start-up

winding and their effect on EMI performance in

this kind of isolated bi-directional converter.

Comparison includes circuits analysis and

test result. The EMI test setup is described.

EMI measurements are given and explained. EMI

solutions for bi-directional DC/DC converter

are discussed. An EMI filter is designed and

final test result is given.

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