1. A ZVS DC–DC converter for PHEV
Charger

2. OVERVIEW
 Area of project work
 Introduction
 Design objectives
 Circuit diagram
 Modes of operation
 Simulation results
 References
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3. AREA OF PROJECT WORK
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 Developing a DC-DC converter
 Hybrid electric vehicle charger
 Soft switching

4. INTRODUCTION
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 Plug-In Hybrid Electric Vehicles
 Plug-in hybrid electric vehicles have an internal combustion engine
and an electric motor, which uses energy stored in batteries.
 Advantages in fuel economy
 Less environmental impact over conventional automobiles
 Onboard charger - responsible for charging the battery pack

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Simplified block diagram of a universal battery charger
 2 stages of conversion for a battery charger:
1. AC-DC PFC boost conversion
2. DC-DC converter with output filter

7. Problems faced by existing topologies
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 Limited ZVS range
 Reduction in power transfer capability
 Voltage spike across rectifier diodes
 Increased component count

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DESIGN OBJECTIVES
 1.65 KW on board charger for PHEV
 Low cost
 Minimizing charger size
 High efficiency

9. CIRCUIT DIAGRAM
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10. MODES OF OPERATION
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 Assumptions:
1. Resonant inductor include the leakage inductance
2. Output rectifier is ideal
3. All parasitic capacitances(winding &heat sink capacitances) are
lumped with switch output capacitance.

11. MODES OF OPERATION
 MODE 1(t0-t1)
 DCM

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 Using KVL
 Taking initial condition,

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 Mode 2(t1-t2)
 DCM

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 Taking initial condition,
 Inductor current

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 Mode 3(t2-t3)
 DCM
Parasitic capacitances of DR1
and DR4 resonates with Lr

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 Mode 4(t3-t4)
 DCM

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 Mode 5(t4-t5)
 DCM

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 Mode 6(t5-t6)
 DCM
Parasitic capacitances of DR2 and DR3
resonates with Lr

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 MODE 1(t0-t1)
 CCM

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 Mode 2(t1-t2)
 CCM

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 Mode 3(t2-t3)
 CCM

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 Mode 4(t3-t4)
 CCM

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 Mode 5(t4-t5)
 CCM

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 Mode 6(t5-t6)
 CCM

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 Drawbacks of CCM operation:
 Larger resonant inductor value required
 Transformer turns ratio increases
 Voltage stress on primary switches increases

26. SIMULATION
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MatLab Simulink Model

27. •Output voltage
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28. •Voltage across AB node
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•Current through Lr

30. RESULTS OF SIMULATION
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 DCM operation:
 ZVS turn ON for Q3 and Q4
 Near zero current switching of Q1 and Q2
 Voltage spikes across diodes are eliminated
 Natural lossless commutation of rectifier diodes

31. GANTT CHART
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Sl.No TASK NOV DEC JAN FEB MARCH APR MAY
1
Searching various topics.
Selecting and sorting paper
2
Got approved
Reference study, Literature survey
3
Modeling and simulation
4
Designing, Hardware
implementation and testing
5
Studying practical feasibility
6 Report writing

32. REFERENCES
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 Base paper:
[1] Deepak S. Gautam, Fariborz Musavi,Wilson Eberle and William G. Dunford,
”A zero- voltage switching full-bridge dc–dc converter with capacitive
output filter for plug-in hybrid electric vehicle battery charging”, IEEE
Trans. on power electronics, vol. 28, no. 12, December 2013.
 Reference papers:
[2] M. Pahlevaninezhad, P. Das, J. Drobnik, P. K. Jain, and A. Bakhshai, “Anovel ZVZCS full-
bridge DC/DC converter used for electric vehicles,”IEEE Trans. Power Electron., vol.
27, no. 6, pp. 2752–2769, Jun. 2012.
[3] D. Gautam, F. Musavi, M. Edington, W. Eberle, and W. G. Dunford, “An automotive on-
board 3.3 kWbattery charger for PHEV application,” IEEE Trans. Veh. Technol., vol.
61, no. 8, pp. 3466–3474, Oct. 2012.
[4] M. Ordonez and J. E. Quaicoe, “Soft-switching techniques for efficiency gains in full-
bridge fuel cell power conversion,” IEEE Trans. Power Electron., vol. 26, no. 2, pp.
482–492, Feb. 2011

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34. ZVS Capability
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 ZVS achieved by providing inductive current during ON
and snubber capacitor across switches during OFF
 Loss of ZVS causes:
 High switching losses
 Very high EMI
 Noisy control

35. Voltage spike across rectifier diodes
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•Rectifier connects 2
inductances(current courses)
•RCD snubbers used to mitigate
voltage spikes
•Large amount of losses in snubber
resistance
•Efficiency of the converter decreases