Performance analysis of bi directional dc-dc converters for electric vehicles To Get this projects Call : 9566355386 / 99625 88976 Visit : www.lemenizinfotech.com / www.ieeemaster.com Mail : projects@lemenizinfotech.com

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Performance Analysis of Bi-directional DC-
DC Converters for Electric Vehicles
Abstract
The DC-DC converter needs to have bi-directional power
flow capability so that regenerative energy can be captured and
stored in the energy storage. In addition, some applications may
require overlapping input-output voltage ranges.
The two DC-DC converters analyzed and compared in this
research can be used for DC fast charging in EV/HEVs to
extend the all-electric drive range. A municipal parking deck
charging station with DC power distribution bus can employ bi-
directional DC-DC charger to allow Vehicle to Grid (V2G)
operation [3]. V2G operation can be useful to inject real or
reactive power to the grid to ensure current harmonic filtering or
load balancing. A bi-directional converter with overlapping
input output voltage range would enhance the operational
flexibility for G2V or V2G applications.
Existing system
This system requires two switching dc to ac converters
operating at a high frequency so as to convert the dc input to
high frequency ac quantities. Galvanic isolation between the

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source and load side is provided by the high-frequency
transformer. Transformer also performs voltage matching
between the source and the load side since the voltage ratio
between them is very high. The transformer works with ac
quantities and hence a dc-ac converter is required at both the
terminals. Since the system is meant for the energy transfer in
both the directions, dc to ac converters employed must have the
capability of bidirectional power flow. This converters also like
the non-isolated bidirectional DC-DC converters works in two
modes of operation i.e. in buck or boost.
Proposed system
The conventional Cascaded Buck Boost Inductor in the
middle (CBB-IIM) having an interfacing inductor between the
input and output sides. On the other hand presents the Cascaded
Buck Boost Capacitor in the middle (CBB-CIM) topology where
the two half bridge converters are cascaded together with a
common dc bus capacitor.
The DC bus voltage is typically higher than the battery voltage
in electric vehicles with a boost stage, but depending on the
characteristics of the batteries and design of the propulsion
system the battery voltage may overlap with the nominal DC bus
voltage. Therefore, the converter must have the capability to
handle the input and output side voltages with overlapping

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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
ranges. Both the converters, CBB-IIM and CBB-CIM, have the
input and output voltage overlap capability.

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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
 Low cost
 Less number of switches
Block diagram
BUFFER
circuit
5VDC
PIC controller
circuit
Gate driver circuit
12 V DC
Cascaded half
bridge and full
bridge converterFilter
LC filter
Output
INPUT
DC
supply

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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
Tools and software used:
 MPLAB – microcontroller programming.
 ORCAD – circuit layout.
 MATLAB/Simulink – Simulation.