Objective:
Methodology:
Expected Outcomes:
The objective of this research is to design a highly efficient
bi-directional dc-dc converter with the input and output
filters in order to remove the common mode and differential
mode noises.
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It is expected to have very efficient, low cost, dense
and reliable bi-directional dc-dc converter with full
understanding of each and every part of the
converter. Calculations and test results will be
shown with the proper details of operating
conditions and with the list of apparatus to be used
to achieve the practical results.
It will be fully equipped with the input and output
filters in order to reduce the noise generated by the
switching of power semi-conductor devices and due
to the stray capacitances associated in the different
parts of the converter.
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Introduction:
Bi-directional dc-dc converters are used where the flow of
energy is required in both directions that is from low voltage
to high voltage side and vise versa. It is one of the most
interested area of research now a days for scientists and
engineers.
Many claims of highly efficient bi-directional converters
found in the literature, however, dramatic drop in efficiency
at high power levels has been observed. One reason of such
inefficiency is might be a wide acceptance of conventional
theories and design techniques such as primary side clamp
circuits, more than twice of component ratings, ZVS and etc.
Another reason could be the lack of concentration towards
the magnetic components of the converter those are power
transformer and inductor.
Moreover, there is inherently high capacitive coupling in the
transformer therefore input and output filters must be
incorporated to reduce such noises but then again no
demonstration of EMI filters with bi-directional converter
found in the literature.
This project is all about to put emphasis on these issues.
Fig. 1. EMI Choke/EMI Filter
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Detailed literature review of EMI filters and existing
converter topologies to know the real problematic areas
To build a test converter (uni-directional) very quickly to
get hands on experience of designing of magnetics and
converter itself. Primarily measurements could be done on
this converter
To do some early measurements of noises on existing
converters by using EMI Receiver and LISN network
To design EMI Filter.
To suggest the simplest and cost effective topology
Hardware design of low power bi-directional dc-dc
converter to check the performance
Hardware design of high power converter and its testing
Optimization of converter if needed
At the same time journal paper writing
Thesis writing and submission
References:
[1] Wensong Yu, Hao Qian and Jih-Shend Lai, “Design
of high-efficiency bidirectional DC-DC converter and
high-precision efficiency measurement,” Industrial
Electronics IECON, Nov 2008, pp. 685 – 690.
[2] K Wand, C.Y.Lin, L Zhu, D Qu, F.C.Lee and J.S.Lai,
“Bi-directional DC to DC converters for fuel cell
systems,” Power Electronics in Transportation, Oct
1998, pp. 47 – 51.
[3] Huang-Jen Chiu, Li-Wei Lin, “ A bidirectional DCDC converter for fuel cell electric vehicle driving
system,” IEEE Trans. Power Electron., vol. 21, no. 4, pp.
950-958, Jul. 2006.
[4] M. Nymand, M. A. E. Andersen, “High-efficiency
isolated boost dc-dc converter for high-power lowvoltage fuel cell applications,” IEEE Trans. Ind.
Electron., vol. 57, no. 2, pp. 505-514, Feb. 2010.
[5] M. Nymand, U. K. Madawala, M. A. E. Andersen, B.
Carsten, O. S. Seiersen, “Reducing ac winding losses in
high-current high-power inductors,” in Proc. IEEE
IECON, Porto, Portugal, 2009, pp. 774-778.