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.
