Large-Signal Characterization of Power Inductors in EV
Bidirectional DC–DC Converters Focused on Core Size
Optimization
ABSTRACT
This project is focused on core size optimization of power inductors in
bidirectional dc–dc converters. It presents an experimental large-signal
characterization procedure for power inductors in electric vehicle applications and
a method to obtain an inductance reference value for the power inductor in dc–dc
converters’ simulation studies. It discusses the importance of the inductor design
project by describing important constraints such as core size and saturation.
CIRCUIT DIAGRAM
EXISTING SYSTEM
The power inductor plays an essential role in the overall performance of the
system. Critical aspects are related to core material limitations, i.e., saturation and
core losses, both of which depend on the changing flux. Other aspects are related
to the transient performance of the converter. A recurrent topic is the magnetics
performance and optimization, and one of the main challenges is how to improve
the components’ choice and sizing. The filter inductor is typically sized based on
its current rating and maximum permissible ripple. However, due to the highcurrent response of such energy storage elements, the converter may operate for
short periods with much higher currents than the rated values. In such conditions,
the power inductor core may reach important levels of flux density that can be
close to material saturation.
PROPOSED SYSTEM
The main objective of this project is to present an adequate design of the
power inductor without using interleaving techniques by proposing two
approaches, i.e., initially, by an appropriate selection of core material. It is a
common practice to build inductors with gapped cores to prevent saturation.
Powder alloy or powder iron cores are manufactured from highly compressed
powdered ferrous alloy or iron. Small air gaps are evenly distributed throughout
the core material, and this acts in a similar way to gapping a ferrite core.
TOOLS AND SOFTWARE USED:
 MP LAB
 ORCAD/PSPICE
 MATLAB/SIMULINK
OUTPUT:
 HARDWARE
 SIMULATION
REFERENCE:
Marina S. Perdigão, Member, IEEE, João Pedro F. Trovão, Member, IEEE, J. M.
Alonso, Senior Member, IEEE, and E. S. Saraiva, Life Member, IEEE, “LargeSignal Characterization of Power Inductors in EV Bidirectional DC–DC
Converters Focused on Core Size Optimization”, IEEE TRANSACTIONS ON
INDUSTRIAL ELECTRONICS, VOL. 62, NO. 5, MAY 2015