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
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.
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.
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
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
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.