full project ppt

1. STUDENT NAMES
BATCH NUMBER:
TWO SWITCH ISOLATED AC TO DC SEPIC CONVERTER FOR EV CHARGER
PROJECT GUIDE:
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CONTENTS
1.Introduction
2. Objectives
3. Literature survey
4. Existing system (with block diagram)
5. Proposed system
5.1 Block diagram
5.2 Modes of operation
6.simulation
6.1 simulation diagram
6.2 simulation waveform
7.Hardware
7.1 Hardware design specification
7.2 Output result
8. Conclusion
9. Future scope
10. Reference

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Introduction
 In the rapidly evolving field of electric vehicles (EVs), one of the key components that play a
crucial role in the efficiency and performance of these vehicles is the charging system.
 This project focuses on the design and implementation of a Two-Switch Isolated AC to DC SEPIC
(Single Ended Primary Inductor Converter) for EV charging. The converter is designed to
operate with high efficiency, providing electrical isolation between the input and output for
enhanced safety and reliability.
 It also aims to be flexible, accommodating a wide range of input voltages, and cost-effective,
balancing performance and affordability.
 The project also explores the integration of this converter with an EV charging system, a
relatively new and rapidly evolving field. The ultimate goal is to contribute to advancements in
EV charging systems, making them more efficient, safe, and accessible.

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Objectives
To design and implement a bridgeless SEPIC PFC converter for EV battery
charging. The project aims to achieve the following specific objectives:
 To eliminate the input diode bridge rectifier and reduce the conduction losses
associated with the switching devices.
 To provide a unity power factor operation and an input current free from any
harmonics, complying with the international standards.
 To implement a constant current/constant voltage control mode for charging
the battery with the help of two PI controllers.
 To evaluate the performance of the proposed converter in terms of efficiency,
power quality, and load regulation.

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Literature survey
1.PROJECT TITLE: ON ENERGY STORAGE REQUIREMENTS IN MODULAR MULTILEVEL
CONVERTERS
AUTHOR NAMES: A. Khaligh, J. Cao, and Y. Lee
PUBLICATION: ,” IEEE Trans. Power Electron., vol. 24, no. 3, pp. 862–868, Mar. 2009.
The modular multilevel converter topology is developed for high-voltage and high-power applications .By
using sub modules equipped with dc-capacitors excellent output voltage waveforms can be obtained at low
switching frequencies Analysis of the energy-storage requirements will provide an important contribution
for dimensioning and analysis of modular multilevel converters.

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Literature survey
2. PROJECT TITLE: DESIGN AND CONTROL OF A MODULAR MULTILEVEL DC/DC
CONVERTER FOR REGENERATIVE APPLICATIONS
AUTHOR NAME: Jakka, V.N.S.R., Shukla, A., Demetriades, G.D.
PUBLICATION: IEEE Trans. Ind. Electron., 2017, 64, pp. 4549–4560
Different cascaded and multilevel topologies to interface super capacitors to a dc bus in regenerative
braking applications The proposed control method is able to balance super capacitor voltage while
providing precise output current control.

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Literature survey
3. PROJECT TITLE: MODELING AND CONTROL OF A NEW THREE-INPUT DC–DC BOOST
CONVERTER FOR HYBRID PV/FC/BATTERY POWER SYSTEM.
AUTHOR NAME: Akar, F., Tavlasoglu, Y., Vural, B.:
PUBLICATION: IEEE Trans. Transp. Electrification, 2017, 3, pp. 191–200
The converter interfaces two unidirectional input power ports and a bidirectional port for a storage element
in a unified structure. This converter is interesting for hybridizing alternative energy sources such as
photovoltaic (PV) source, fuel cell (FC) source, and battery. Load voltage control , charging or discharging
the battery can be made by the PV and the FC power sources individually or simultaneously. The proposed
structure utilizes only four power switches that are independently controlled with four different duty ratios.

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Literature survey
4. PROJECT TITLE: AN ISOLATED MULTIPORT DC–DC CONVERTER FOR
SIMULTANEOUS POWER MANAGEMENT OF MULTIPLE DIFFERENT RENEWABLE
ENERGY SOURCES.
AUTHOR NAME: Khajesalehi, J., Hamzeh, M., Sheshyekani, K.
PUBLICATION: , Electr. Power Syst. Res., 2015, 125, pp. 164–173
Proposed dc–dc converter only uses one controllable switch in each port to which a source is connected.
Therefore, it has the advantages of simple topology and minimum number of power switches Simultaneous
maximum power point tracking (MPPT) control of a wind/solar hybrid generation system is achieved

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Literature survey
4. PROJECT TITLE: AN ISOLATED MULTIPORT DC–DC CONVERTER FOR
SIMULTANEOUS POWER MANAGEMENT OF MULTIPLE DIFFERENT RENEWABLE
ENERGY SOURCES.
AUTHOR NAME: Khajesalehi, J., Hamzeh, M., Sheshyekani, K.
PUBLICATION: , Electr. Power Syst. Res., 2015, 125, pp. 164–173
Proposed dc–dc converter only uses one controllable switch in each port to which a source is connected.
Therefore, it has the advantages of simple topology and minimum number of power switches Simultaneous
maximum power point tracking (MPPT) control of a wind/solar hybrid generation system is achieved

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Literature survey
5. PROJECT TITLE: MODELING AND CONTROL OF THREE-PORT DC/DC CONVERTER
INTERFACE FOR SATELLITE APPLICATIONS
AUTHOR NAME: Zhang, N., Sutanto, D., Muttaqi, K.M.:
PUBLICATION: , Renew. Sustain. Energy Rev., 2016, 56, pp. 388–401
Presents the control strategy and power management for an integrated three-port converter, which interfaces
one solar input port, one bidirectional battery port, and an isolated output port Multimode operations and
multi loop designs are vital for such multiport converters. Control design is difficult for a multiport
converter to achieve multifunctional power management uses of various cross-coupled control loops.

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Existing system
- The existing system primarily consists of a solar panel, a bi-directional DC to DC converter, a battery, and a super capacitor. - The solar panel captures sunlight and
1. The existing system for EV charging using a Two-Switch Isolated AC to DC SEPIC Converter typically
involves a power factor correction (PFC) converter. This converter operates in a discontinuous current
mode, presenting a unity power factor operation over the entire charging duration.
2. The voltage stress on the switches in this converter is related to the peak of phase voltage instead of
line voltage. The converter structure includes two inductors, a switch, a diode, a coupling capacitor,
and an output capacitor.
3. During the turn-on condition, the coupling capacitor discharges, causing both the inductors to get
charged. This structure provides four different modes of operation, each with different operating
stages, waveforms, and design equations.
4. The existing system is designed to be energy-efficient, stable, and distortion less compared to
conventional LED driver

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BLOCK DIAGRAM
Block diagram of A EV Battery Charger Using a PFC based
Bridgeless SEPIC Converter

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Proposed system
Schematic of Bridgeless Isolated SEPIC Converter used for
battery charging

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Proposed system
The suggested two switch isolated ac to dc SEPIC converter-based Power
Factor Correction (PFC) converter.
To manage power in each switching cycle, the architecture includes two
switch separated SEPIC converters connected in parallel. Each phase of the
converter contains one MOSFET switch (S1 and S2) to reduce the number of
components. The purpose of diodes D5 and D6, which are grounded from the input
AC voltage, is to reduce noise caused by electromagnetic interference (EMI).
Interestingly, the recommended converter is made to function well in
cycles of both positive and negative AC supply. The input inductor L2, L3, the
semiconductor switches S1, the capacitors C1, C2, the diodes D1, D2, and the
output inductor L5 make up the converter group's phase 1. Phase 2 components are
the input inductor L1, L4, output inductor L6, capacitor C3, C4, diode D3, D4,
semiconductor switch S2, and diode D4.
The output dc link capacitor for phases 1 and 2 is frequently linked to the
capacitor C0. There are four (4) modes of operation that may be used to illustrate
how the proposed converter operates.

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MODES OF OPERATION
Mode-1 (half-cycle in positive with the S1 and S2 switches ON)
Mode-2: (Half-cycle in negative with the S1 and S2 switches off)

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SIMULATION DIAGRAM

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SIMULATION OUTPUT
INPUT VOLTAGE AND CURRENT 230 V Output Voltage 12 to 48 v

18. Simulation Waveform
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Input AC source voltage &
current
Output
voltage & current

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Simulation Waveform
Output voltage & current

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HARDWARE DESIGN SPECIFICATION
 The hardware design specification for a Two-Switch Isolated AC to DC SEPIC Converter for EV Charging
typically includes the following components:
 Power Factor Correction (PFC) Converter: This is used to correct the power factor and ensure that the input
current is in phase with the input voltage1.
 Two-Switch Inverter: This is used to convert the rectified DC into high-frequency AC1.
 High-Frequency Transformer: This is used to transform the high-frequency AC into a lower voltage, high-
frequency AC1.
 Rectifier and Filter: These are used to convert the high-frequency AC back into DC1.
 Control Circuit: This is used to control the operation of the converter, including the switching of the inverter and
the regulation of the output voltage

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HARDWARE DESIGN SPECIFICATION
HARDWARE BLOCK DIAGRAM

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HARDWARE DESIGN SPECIFICATION
HARDWARE BLOCK DIAGRAM

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HARDWARE SETUP

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HARDWARE OUTPUT
 High Voltage Gain: The converter is expected to provide a high voltage gain,
which is necessary for charging the battery or powering the EV.
 Efficient Power Transfer: The converter is expected to efficiently transfer
power between the input sources (solar PV module and battery) and the
load (EV).
 Versatile Operation: The converter is expected to operate in multiple modes,
allowing it to adapt to different operating conditions.

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CONCLUSION
 In conclusion, the implementation of a Two-Switch Isolated AC to DC
SEPIC Converter for EV Charging presents a promising advancement in
the field of electric vehicle technology.
 This project not only aims to improve the efficiency and safety of EV
charging but also contributes to the broader goal of promoting the
adoption of electric vehicles.
 The innovative approach of using a SEPIC converter offers several
advantages, including bidirectional power flow, electrical isolation, and
accommodation of a wide range of input voltages. This project serves
as a significant step towards a more sustainable and efficient future in
transportation.

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FUTURE SCOPE
 The future scope of the project involving a Two-Switch Isolated AC to DC SEPIC
Converter for EV Charging is quite promising. As the demand for electric
vehicles (EVs) continues to grow, the need for efficient and reliable EV charging
systems will also increase1. This project could lead to significant advancements
in this area.
 The proposed converter has several advantages over traditional converters,
including its ability to operate in both step-up and step-down modes, providing
electrical isolation between the input and output, and accommodating a wide
range of input voltages2. These features make it highly suitable for EV charging
applications

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REFERENCES
[1] Ganjavi, A., Ghoreishy, H., Ahmad, A.A.: ‘A novel single-input dual-output
three-level DC–DC converter’, IEEE Trans. Ind. Electron., 2018, 65, pp.
8101–8111
[2] Rashidi, M., Altin, N.N., Ozdemir, S.S., et al.: ‘Design and development of a
high-frequency multiport solid-state transformer with decoupled control
scheme’, IEEE Trans. Ind. Appl., 2019, 55, pp. 7515–7526
[3] Reddi, N.K., Ramteke, M.R., Suryawanshi, H.M., et al.: ‘An isolated multi-
input ZCS DC–DC front-end-converter based multilevel inverter for the
integration of renewable energy sources’, IEEE Trans. Ind. Appl., 2018, 54,
pp. 494–504
[4] İnci, M., Türksoy, Ö.: ‘Review of fuel cells to grid interface: configurations,
technical challenges and trends’, J. Clean Prod., 2019, 213, pp. 1353–1370
[5] Zhang, N., Sutanto, D., Muttaqi, K.M.: ‘A review of topologies of three-port
DC–DC converters for the integration of renewable energy and energy storage
system’, Renew. Sustain. Energy Rev., 2016, 56, pp. 388–401

28. Thank You
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