Study on Large Air-Gap Bi-directional Wireless Battery Charger for Electric Vehicles
by Yoo, Kwang Min
Department of Electrical Engineering
Graduate School, Myongji University
Directed by professor Lee Jun Young
ABSTRACT
In this paper, we provide battery charging/discharging for electric vehicles,
including hybrid car using a wireless power transmission technology. Because the
power sources of EV and PHEV are fully or partially supplied from batteries
charged from public line, on-board chargers should be mounted.
Conventional on-board battery chargers for PHEV or EV have two-stage
structure of input current shaper for harmonic reduction followed by DC/DC
converter for output control and electrical isolation. And On-board battery
charger is installed in the vehicle at all times. So It will account for constant
volume of the car. It will contribute a constant fuel consumption of the vehicle
by increasing the weight of the electric vehicle. Currently, the most conventional
method is plug-in charging, where a copper connected cable forms the power
link. There are several disadvantages to this method, which have led to the
investigation of inductive charging technology. On-board chargers are burdened
by the need for a cable and plug charger, galvanic isolation of the on-board
electronics, the size and weight of the charger, and safety and issues with
operating in rain and snow. Wireless power transfer (WPT) is an approach that
provides a means to address these problems and offers the consumers a seamless
and convenient alternative to charging conductively. In addition, it provides an
inherent electrical isolation and reduces on-board charging cost, weight and
volume. Depletion of fossil fuel reserves and current practice in generation,
transmission, distribution, and utilization of energy are major worldwide concerns,
for which distributed generation (DG) and harnessing of renewable energy are
considered to be partial and acceptable solutions. However, the quality of power
delivered by DG systems, particularly those based on wind energy and solar
energy, is largely affected by the stochastic nature of their energy production.
Consequently, in order to improve the power quality while meeting the demand in
the most economical and efficient way, energy suppliers relied on energy storage
systems, particularly for DG systems of medium power levels. Among various
storage solutions such as flywheels, batteries, super-capacitors, etc., the
vehicle-to-grid (V2G) concept, which uses hybrid vehicles or pure electric
vehicles (EVs) to store and supply energy back to the grid, is gaining more and
more popularity as hybrid.
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