The Electric Vehicle (EV) drivetrain includes a motor drive
system and battery system. A dc-dc converter can be inserted between the
battery pack and the DC-link connected to the inverter. To meet the industrial
applications the dc-dc converter must be designed for a high power rating. For
high power applications, the inductor design plays an important role in the
conventional step-up converter. The size of the inductor depends on the current
rating and the core material. To improve efficiency and to reduce the volume of
the core, the interleaved technique is used. Interleaving is the process to
operate the N number of converters connected in parallel with the TS/N
phase shift. Batteries are primarily used for storage, most of the batteries
are designed to have good energy density. However, for automotive applications,
storage devices should have good power density, to satisfy the acceleration
requirement and it should have good energy density for sufficient drive range
requirement. Batteries can be designed to have either good energy density or
good power density, but not both together. It is achieved by a hybrid energy
storage system (HESS) which consists of different electrical storage devices
with complementary characteristics. UC is a high power density device so, this
can assists batteries to supply/absorb transient power demands in HESS. A
two-phase interleaved bidirectional converter (IBC) has been designed to
maintain dc-link voltage for battery and UC. Power split between battery/UC is
achieved by the frequency sharing method. Both the converters have been
operated in continuous current mode (CCM). Simulations have been tested for 10
kW power level in SIMULINK/MATLAB. The prototype has been developed for a 5kW
power level.