It is topic about bidirectional dc-dc converter.

1. A SEMINAR PRESENTATION
ON
“ Energy Management Power Converter in Hybrid Electric and Fuel Cell Vehicle”
Presented by – Satyajeet sahoo
Semester: 6th
Branch- [ EE ]
Regd.no: 2021219124
Guided by –Dr. Sibasish panda
COLLEGE OF ENGINEERING, BHUBANESWAR
DESIGNATION –Asst. Prof

2. ABSTRACT
Using a bidirectional dc–dc converter along with low-
voltage energy storage for the high-voltage dc bus and
traction motor drives has been a prominent option for
hybrid electric and fuel cell vehicles. This paper will
describe the significance of energy management power
converters and their circuit topology options for
efficiency, size, and cost considerations. Whether
isolated or nonisolated, soft switching techniques have
been widely used in high-power bidirectional dc–dc
converters.

3. CONTENTS
 INTRODUCTION
 CONFIGURATION OF ENERGY MANAGEMENT SYSTEM
 BASIC BI-DIRECTIONAL DC-DC CONVERTERS
 ISOLATED BI-DIRCTIONAL DC-DC CONVERTER
 MULTIPHASE BIDIRECTIONAL DC-DC CONVERTERS
 CONCLUSION
 REFERENCES

4. INTRODUCTION
 Energy storage , whether battery or ultra capacitor, can be employed to reduce the cost and
improve the performance of a hybrid electric vehicle or a fuel cell vehicle.
 Vehicle fuel consumption is generally measured over transient (stop-and-go, acceleration and
deceleration) drive cycles where the fuel converter (either engine or fuel cell) operates at part
load most of the time.
 Energy management in hybrid vehicles can be used to store energy generated at one operating
load and then supplement the propulsion requirements at a different load condition.
 Key features of energy management power converters are:
1) high-power dc to dc
2) bidirectional power flow
 High-power dc to dc conversion is the nature of these vehicle energy management power
converters as more energy needs to be processed through this load-leveling system.
 Bidirectional power flow enables the energy capture of regenerative brake and energy release
during startup and hill climbing.

5. CONFIGURATION OF ENERGY
MANAGEMENT SYSTEM
Fig.1 Energy management in hev Fig.2 Energy management in fcv

6. BASIC BIDIRCTIONAL DC-DC CONVERTER
 It is categorised as 2 types
1. Non-isolated
2. Isolated
 NON-ISOLATED is categorised into 3 type
1. Buck type
2. Boost type
3. Buck-Boost type

7. Fig.3 Boost type non-isolated bidirectional dc-dc
converter
Fig.4 Buck type non-isolated bidirectional dc-dc
converter
Fig.5 BUCK-BOOST type bidirectional dc-dc
converter

8. ISOLATED
LV side and HV side cannot be grounded together.
The voltage ratio between HV and LV is high enough
that the device is not economical to handle very high
voltage and current simultaniously.
Its each sides work as inverter/rectifier.
 Current conduct through switches in inverter
mode, In rectifier mode current conduct through
gate. Fig.6 Basic isolated bidirectional dc-dc converter

9. ISOLATED BIDIRECTIONAL DC-DC CONVERTER
• The device on LV side is power MOSFET
and on LV side is IGBT.
• Its advantage is size reduction using spilt
inductors.
•It is active clamping circuit.
•During battery discharge mode
operation, the active clamp circuit
allow (zvzcs) because the primary
side current is reset to zero.
Fig.6
Fig.7

10. MULTIPHASE BIDIRECTIONAL DC-DC
CONVERTER
 It is 2 types.
1. NON-ISOLATED MULTIPHASE INTERLEAVED
2. ISOLATED MULTIPHASE INTERLEAVED

11.  NON-ISOLATED MULTIPHASE INTERLEAVED
 For high power application, a single converter requires multiple
devices to handle high current.
 It is desireable to have more phase legs to allow reduction of
either voltage or current stress.
Fig.8 Three phase non-isolated bidirectional dc-dc converter

12.  ISOLATED MULTIPHASE INTERLEAVED
 The isolated bidirectional dc-dc converter can also be designed with multiphase interleaving.
 This arrangment can change on depending upon voltage and current.
Fig.9 Three phase isolated bidirectional dc-dc converter

13. CONCLUSION
 The major function of a vehicle energy management power converter is to
provide bidirectional power flow between energy storage and the dc bus
of the inverter –motor drive .
 voltage level and the size of the battery are the key factors to determining
the converter circuit configuration.
 For both HEV and FCV ,the high power bidirectional dc-dc converter is an
essential part of energy management system.
 As power demand increases ,multiple dc-dc converter will become the
main stream of high power conversions for vehicle energy management
system.

14. REFERENCES
 J. Moreno, M. E. Ortuzar, and J. W. Dixon, “Energy management system for a hybrid electric vehicle, using
ultracapacitors and neural networks,’’ IEEE Trans. Ind. Electron., vol. 52, no. 2, pp. 614–623,Apr. 2006.
 C. Musardo, G. Rizzoni, and B. Staccia , “ A-ECMS: An adaptive algorithm for hybrid electric vehicle energy
management,”[ in Proc. IEEE CDC-ECC, Seville, Spain, Dec. 2005, pp. 1816–1823.
 Y. Gao and M. Ehsani, “Parametric design of the traction motor and energy storage for series hybrid off-road
and military vehicles,’’ IEEE Trans. Power Electron.,vol. 21, no. 3, pp. 749–756, May 2006.
 P. Atwood, S. Gurski, D. J. Nelson, and K. B. Wipke, “Degree of hybridization modeling of a fuel cell hybrid
electric sport utility vehicle,’’ SAE Trans., J. Engines, vol. 110, pp. 93–100, SAE Paper 2001-01-0236.
 T. Matsumoto, N. Watanabe, H. Sugiura, and T. Ishikawa, “Development of fuel-cell hybrid vehicle,[ presented
at the Proc. 2002 SAE Congress, Fuel Cell Power for Transportation, Detroit, MI, Mar. 2002, SP-1691, SAE Paper
2002-01-0096.
 F. Caricchi, F. Crescimbini, and A. Di Napoli,B20 kW water-cooled prototype of a buck-boost bidirectional dc–
dc converter topology for electrical vehicle motor drives,[ in Proc. APEC,, Dallas, TX, Mar. 1995pp. 887–892.
 F. Caricchi, F. Crescimbini, F. Giulii-Capponi, and L. Solero, “Study of bidirectional buck-boost converter
topologies for application in electrical vehicle motor drives,[ in Proc. APEC, Anaheim, CA, Feb. 1998, pp. 287–
293.

15. THANK
YOU