This document describes a proposed battery charger system for plug-in hybrid electric vehicles (PHEVs). The proposed system aims to improve upon existing resonant converter topologies by using a dual active bridge design with GaN switches to achieve high efficiency and power density. It analyzes ripple power balance and control methods to suppress voltage ripples on the DC link. The system is intended to efficiently charge PHEV batteries from AC wall sockets and features good performance, simplicity, and small size.

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Dual Active Bridge-Based Battery Charger
for Plug-in Hybrid Electric Vehicle with
Charging Current Containing Low
Frequency Ripple
Abstract
Introduction:
The batteries of PHEVs are charged by connecting a plug
to the wall socket if the battery charger is on-board. As such,
achieving high efficiency and a small size for the battery charger
is very important, as these factors will help to improve overall
performance of the PHEV. Wide band-gap power switches, such
as Gallium Nitride (GaN) and Silicon Carbide (SiC), outperform
silicon counterparts in terms of switching speed and on-
resistance, and therefore can improve the power density of
various converters by shrinking the size of passive components.
Existing system:
This dc–dc full-bridge converter uses resonant techniques
in which resonant elements such as capacitors and inductors are
used to shape the current through a converter switch so that it
can fall to zero to allow the switch to turn off with ZCS. The

2. Do Your Projects With Domain Experts…
[Type the company name]Copyright © 2015 LeMeniz Infotech. All rights reserved
LeMeniz Infotech
36, 100 Feet Road, Natesan Nagar, Near Indira Gandhi Statue,
Pondicherry-605 005.
Call: 0413-4205444, +91 9566355386, 99625 88976.
Web : www.lemenizinfotech.com / www.ieeemaster.com
Mail : projects@lemenizinfotech.com
resonant elements, however, are large and bulky, which makes
their use impractical for many applications, and the converter is
operated with variable frequency control, which makes the
design of the converter more difficult and also increases the size
of the converter as it must operate with low switching
frequencies at lighter loads.
Proposed system:
This paper synthesizes the idea of this sinusoidal charging
scheme and gives in-depth analysis of ripple power balance and
control realization. In addition, this paper also analyzes the
converter loss impact on the increase of DC link voltage ripple
under ideal sinusoidal charging. This DC link voltage ripple can
be suppressed by a direct control path on the voltage ripple.

3. Do Your Projects With Domain Experts…
[Type the company name]Copyright © 2015 LeMeniz Infotech. All rights reserved
LeMeniz Infotech
36, 100 Feet Road, Natesan Nagar, Near Indira Gandhi Statue,
Pondicherry-605 005.
Call: 0413-4205444, +91 9566355386, 99625 88976.
Web : www.lemenizinfotech.com / www.ieeemaster.com
Mail : projects@lemenizinfotech.com
Block diagram:
Single
phase AC
supply
Control
Rectifier Filter
Single
phase
inverter
High
frequency
transformer
Control
rectifier
and filter
Load
BUFFER circuit
5VDC
PIC controller
circuit
Gate driver circuit
12 V DC

4. Do Your Projects With Domain Experts…
[Type the company name]Copyright © 2015 LeMeniz Infotech. All rights reserved
LeMeniz Infotech
36, 100 Feet Road, Natesan Nagar, Near Indira Gandhi Statue,
Pondicherry-605 005.
Call: 0413-4205444, +91 9566355386, 99625 88976.
Web : www.lemenizinfotech.com / www.ieeemaster.com
Mail : projects@lemenizinfotech.com
Advantages:
 Good performance and simplicity.
Applications:
 Plug-in Hybrid Electric Vehicles (PHEVs).
Tools and software used:
 MPLAB – microcontroller programming.
 ORCAD – circuit layout.
 MATLAB/Simulink – Simulation.