This paper deals with a unity power factor (UPF) Cuk converter EV (Electric Vehicle) battery charger having a high frequency transformer isolation instead of only a single phase front end converter used in vehicle's conventional battery chargers. The operation of the proposed converter is defined in various modes of the converter components i.e. DCM (Discontinuous Conduction Mode) or CCM (Continuous Conduction Mode) along with the optimum design equations. In this way, this isolated PFC converter makes the input current sinusoidal in shape and improves input power factor to unity. Simulation results for the proposed converter are shown for charging a lead acid EV battery in constant current constant voltage (CC-CV) mode. The rated full load and varying input supply conditions have been considered to show the improved power quality indices as compared to conventional battery chargers. These indices follow the international IEC 61000-3-2 standard to give harmonic free input parameters for the proposed circuit.

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A Unity Power Factor Converter with Isolation for
Electric Vehicle Battery Charger
ABSTRACT:
This paper deals with a unity power factor (UPF) Cuk converter EV (Electric Vehicle) battery
charger having a high frequency transformer isolation instead of only a single phase front end
converter used in vehicle's conventional battery chargers. The operation of the proposed
converter is defined in various modes of the converter components i.e. DCM (Discontinuous
Conduction Mode) or CCM (Continuous Conduction Mode) along with the optimum design
equations. In this way, this isolated PFC converter makes the input current sinusoidal in shape
and improves input power factor to unity. Simulation results for the proposed converter are
shown for charging a lead acid EV battery in constant current constant voltage (CC-CV) mode.
The rated full load and varying input supply conditions have been considered to show the
improved power quality indices as compared to conventional battery chargers. These indices
follow the international IEC 61000-3-2 standard to give harmonic free input parameters for the
proposed circuit.
KEYWORDS:
1. UPF Cuk Converter
2. Battery Charger
3. Front end converter
4. CC-CV mode
5. IEC 61000-3-2 standard
SOFTWARE: MATLAB/SIMULINK

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CIRCUIT DIAGRAM:
Fig. 1 General Schematic of an EV Battery Charger with PFC CUK Converter
EXPERIMENTAL RESULTS:

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Fig.2 Simulated performance of the isolated Cuk converter in rated condition
(a) rated input side and output side quantities (b-c) harmonic analysis of the
current at source end

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Fig.3 Simulated performance of the isolated Cuk converter while input is
varied to 270V (a) rated input side and output side quantities (b-c) harmonic
analysis of the current at source end

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Fig.4 Simulated performance of the isolated Cuk converter while input is
reduced to 270V (a) rated input side and output side quantities (b-c) harmonic
analysis of the current at source end

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Fig.5 Simulated performance of the isolated Cuk converter at light load
condition (a) rated input side and output side quantities (b-c) harmonic analysis
of the current at source end
CONCLUSION:
An isolated Cuk converter based battery charger for EV with remarkably improved PQ
indices along with wellregulated battery charging voltage and current has been designed and
simulated. The converter performance has been found satisfactory and well within standard for
rated as well as different varying input rms value of supply voltages. The considerably improved
THD in the current at the source end makes the proposed system an attractive solution for
efficient charging of EVs at low cost.
The proposed UPF converter performance has been tested to show its suitability for
improved power quality based charging of an EV battery in CC-CV mode. Moreover, the
cascaded dual loop PI controllers are tuned to have the smooth charging characteristics along
with maintaining the low THD in mains current. The proposed UPF converter topology have the

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inherent advantage of low ripples in input and output side due to the added input and output side
inductors. Therefore, the life cycle of the battery is increased. MATLAB based simulation shows
the performance assessment of the proposed charger for the steady state and dynamics condition
which clearly state that the proposed charger can sustain the sudden disturbances in supply for
charging the rated EV battery load. Moreover, during whole disturbances in supply voltage,
thepower quality parameters at the input side, are maintained within the IEC 61000-3-2 standard
and THD is also very low.
REFERENCES:
[1] Limits for Harmonics Current Emissions (Equipment current ≤ 16A per Phase), International
standards IEC 61000-3-2, 2000.
[2] Muhammad H. Rashid, “Power Electronics Handbook, Devices, Circuits, and Applications”,
Butterworth-Heinemann, third edition, 2011.
[3] N. Mohan, T. M. Undeland, and W. P. Robbins, Power Electronics: Converters, Applications
and Design. Hoboken, NJ, USA: Wiley, 2009.
[4] B. Singh, S. Singh, A. Chandra and K. Al-Haddad, “Comprehensive Study of Single-Phase
AC-DC Power Factor Corrected Converters With High-Frequency Isolation”, IEEE Trans.
Industrial Informatics, vol. 7, no. 4, pp. 540-556, Nov. 2011.
[5] A. Abramovitz K. M. Smedley "Analysis and design of a tapped-inductor buck–boost PFC
rectifier with low bus voltage" IEEE Trans. Power Electron., vol. 26 no. 9 pp. 2637-2649 Sep.
2011.