This document proposes a high step-up resonant DC-DC converter with ripple-free input current for renewable energy systems. It uses an input-current doubler and switching mechanism at an output-voltage doubler to achieve high step-up voltage gain without a high turns ratio transformer. An active-clamp circuit suppresses surge voltages and recycles energy from leakage inductance. A resonant circuit at the secondary side reduces switching loss and improves efficiency. The converter achieves zero input current ripple by keeping the primary-side switches' duty cycle fixed at 0.5 regardless of input voltage or load variations.

1. HIGH STEP-UP RESONANT DC/DC CONVERTER WITH
RIPPLE-FREE INPUT CURRENT FOR RENEWABLE ENERGY
SYSTEMS
GUIDED BY PROJECT TEAM

2. ABSTRACT
• In this paper, we propose a high step-up resonant dc-dc converter
with ripple-free input current for renewable energy systems.
• We use an input-current doubler and a switching mechanism
employed at an output-voltage doubler to achieve high step-up
voltage gain without having to use a transformer with high turns
ratio.
• An active-clamp circuit installed on the primary side suppresses the
surge voltage at the switch components and recycles the energy
stored in the leakage inductance.

3. • A resonance that occurs at the secondary side of the converter
is used to reduce the turn-off current and switching loss
significantly, and to achieve high power conversion efficiency.
• The input current ripple declines to zero theoretically because
the duty cycle of the primary-side switches is always set to 0.5
regardless of the input voltages and load variations.

4. OBJECTIVES
• To reduce ripple current.
• To reduce switching loss.
• To accomplish high step up voltage gain without using a
transformer with high turns proportion.

5. INTRODUCTION
• A step up resonant dc-dc converter is used.
• A input current doubler with the active clamp circuit and a output voltage doubler
with the series resonant circuit is used.
• Photovoltaic panel, thermoelectric generator, and fuel-cell stack are used as
renewable energy sources.
• This converter is usually used for low power applications because it relies only on
two switches at the primary side. Interleaved current-fed dual-active-bridge dc-dc
converters have been proposed to further reduce the input-current ripple

6. EXISTING SYSTEM
• High step-up high-efficiency
interleaved converter with voltage
multiplier module for renewable
energy system
• K. C. Tseng and C. C. Huang

7. BASIC BLOCK DIAGRAM

8. BLOCK DIAGRAM OF EXISTING
SYSTEM

9. EXISTING SYSTEMS
ADVANTAGES DISADVANTAGES
• Lowers the input ripple current
and conduction loss.
• The converter obtains high step
up gain.
• Life time and efficiency is
improved.
• Reduces voltage stress on main
switches.
• More components are used.
• High cost.
• Large size.

10. PROPOSED SYSTEM
High Step-Up Resonant DC/DC Converter with
Ripple-Free Input Current for Renewable Energy
Systems
• By using a switching operation
at the secondary side, the
proposed converter can
achieve high step-up voltage
gain with the minimum
number of devices and with a
transformer that has a low
turns ratio.
• A series-resonant circuit at
the secondary side reduces
switching losses
considerably, and thereby
attains the high power
conversion efficiency over the
entire range of operation.

11. BLOCK DIAGRAM

12. PROPOSED CIRCUIT

13. • The input-current ripple reduces to zero because the
primary-side switches are modulated with constant
0.5 duty cycle regardless of the input voltages and
load variations.
• The proposed converter is controlled by adjusting the
duty-cycle of the secondary-side switches.

14. • The flyback converter is used in both AC/DC and
DC/DC conversion with galvanic isolation between
the input and any outputs.
• The flyback converter is a buck-
boost converter with the inductor split to form
a transformer, so that the voltage ratios are
multiplied with an additional advantage of isolation.

15. MODULES OF PROJECT
▫ 1. HARDAWARE DESIGN
 POWER SUPPLY DESIGN
 MICROCONTROLLER CITRCUIT
 DRIVER CIRCUIT
 FLY-BACK CONVERTER
▫ 2. SOFTWARE PROGRAMMING

16. PROJECT REQUIREMENTS
Hardware Requirements:
1.PIC Microcontroller,
2.MOSFET,
3.OPTO COUPLER,
4. POWER SUPPLY
Software Requirements:
MPLAB IDE.

17. DRIVER CIRCUIT

18. Interfacing with microcontroller

19. Power supply circuit
•

20. PIC CONTROLLER:
• PIC is the name for the microchip microcontroller (MCU) family,
consisting of a microprocessor, input/output ports, timers and other
internal, integrated hardware.
• This is the heart of the circuit which performs all commanding and
controlling operations.
• It contain a CPU,RAM(random access memory),ROM(read only
memory),I/O( input/output lines)serial and parallel port, timers and
sometimes other built in peripheral such as A/D( analog to digital )
and D/A( digital / analog) converter

21. IRF840
FEATURES
• Dynamic dV/dt Rating
• Repetitive Avalanche Rated
• Fast Switching
• Ease of Paralleling
• Simple Drive Requirements
• Compliant to RoHS Directive 2002/95/EC

22. Description
• The TO 220AB package is universally preferred for
all commercial-industrial applications at power
dissipation levels to approximately 50 W.
• The low thermal resistance and low package cost of
the TO-220AB contribute to its wide acceptance
throughout the industry.

23. TLP250
• TLP250 is suitable for gate driving circuit of IGBT or power MOS
FET.
• Supply current (ICC): 11mA(max.)
• Supply voltage (VCC): 10−35V
• Output current (IO): ±1.5A (max.)
• Switching time (tpLH/tpHL): 1.5μs(max.)
• Isolation voltage: 2500Vrms(min.)
• Maximum operating insulation voltage: 630VPK
• Highest permissible over voltage: 4000VPK

24. Optocoupler diagram

25. PARAMETERS

26. ADVANTAGES OF PROPOSED SYSTEM
• To reduce the ripple current.
• High step up voltage gain with minimum number of
devices with low turns ratio.
• To reduce switching loss.
• Reduce the number of switches

27. SIMULATION RESULT

29. REFERENCE
• N. Ak and A. Demirbas, “Promising sources of energy in
the near future,” Energy sourc. A, Recovery util.
environ. effects, vol. 38,no. 12, pp. 1730-1738, May 2016.
• S. Goel and R. Sharma, “Performance evaluation of stand
alone,grid connected and hybrid renewable energy
systems for rural application: A comparative review,”
Renew. Sustainable Energy Rev., vol. 78, pp. 1378-
1389, Oct. 2017.
• K. C. Tseng and C. C. Huang, “High step-up high-
efficiency interleaved converter with voltage multiplier
module for renewable energy system,” IEEE Trans. Ind.
Electron., vol. 61, no. 3, pp.1311-1319, Mar. 2014.

30. THANK YOU