A novel two stage interleaved boost converter (IBC) is investigated. In the proposed topology the advantages of IBC like current sharing, high voltage gain and less voltage and current stress on the switches are more effective. The stand-alone PV system is installed at a convenient place. The output of battery is given to proposed converter. The prototype hardware is developed without isolation transformer to drive the load about 600W with the use of pulse width modulated integrated circuits (PWM ICs) and the efficiency about 93%.

1. High Voltage Gain with low Current Stress Interleaved Boost Converter for Photo-voltaic System
IRJPEE
High Voltage Gain with low Current Stress Interleaved
Boost Converter for Photo-voltaic System
*Prasanna Kumar C1 and Mahesh M2
1,2
Department of EEE, PESIT, Bangalore, India
A novel two stage interleaved boost converter (IBC) is investigated. In the proposed topology the
advantages of IBC like current sharing, high voltage gain and less voltage and current stress on
the switches are more effective. The stand-alone PV system is installed at a convenient place. The
output of battery is given to proposed converter. The prototype hardware is developed without
isolation transformer to drive the load about 600W with the use of pulse width modulated
integrated circuits (PWM ICs) and the efficiency about 93%.
Keywords: IBC, isolation, PV system, PWM ICs, Micro-controller
INTRODUCTION
When the boost converter is operated with high value of
duty cycle, the controlling of such system is very difficult.
Generally the preference will be given for the IBC, which
can be operated with high duty ratio for high rated
applications. Other than IBC, size of passive components
bulky, more loading effect and also voltage and current
stress on switches is very high. In the proposed circuit
modification is done by connecting switches in parallel so
that current stress on switches reduced. Converter power
density and efficiency are increased also dynamic in
response. Basically boost converter has to withstand high
current at input and high voltage at the output. IBC with
Continuous Conduction Mode (CCM) has the advantages
for medium to high rated applications (Samosir et al., 2010,
Kim et al., 2011, Ho et al., 2011, Xu et al., 2009).
Coupled inductor IBCs and Complementary Metal Oxide
(CMOS) semiconductor technologies are developed to
handle high circulating current (Van Nguyen et al., 2011,
Everts et al., 2012). With increasing operating frequency
and working in CCM, the sizes of passive components are
reduced effectively (Freitas et al., 2015; Garcia et al.,
2013; Zhang et al., 2013). The reverse recovery problem
is overcome with use of Silicon Carbide SiC) diodes in
place of power diodes. Other IBCs are developed with the
use of current source driver (CSD) and Digital Signal
Processor (DSP) (e Silva et al., 2015; Fukaishi et al., 2012;
Zhange et al., 2015). When the requirement of power is
more than 300W, average current mode IBC is the better
choice (Kim et al., 2014; Rahavi et al., 2012).
The block diagram of proposed work as shown in Fig.1
solar modules are preferably installed at terrace and
connect their output terminals with suitable converter to
batteries to charge (rating of battery 12V, 100A-h). Four
batteries with series connection voltage obtained are
about 12V and that voltage boosted to required level of
230V in order to drive the load. In the proposed circuit has
two stage IBC, two boost inductors are connected with the
switches, which similar to two simple boost converter
which are connected in parallel with same source and load.
The PWM ICs are used in order to maintain phase
difference between switching pluses are 180˚. These
dedicated ICs are makes closed loop operation of
proposed IBC.
*Corresponding author: Prasanna Kumar, Department of
EEE, PESIT, Bangalore, India. Email:
prasannak@pes.edu.in
International Research Journal of Power and Energy Engineering
Vol. 3(2), pp. 035-039, November, 2017. © www.premierpublishers.org, ISSN: 3254-1213x
Conference Paper

2. High Voltage Gain with low Current Stress Interleaved Boost Converter for Photo-voltaic System
Prasanna and Mahesh 036
Fig.1 Block diagram of proposed system
The proposed IBC improves the power density, thermal
distribution, reduction in the size of filters. It is easy to
mount the converter on printed circuit board (PCB), so that
packaging and scalabilities are achievable.
IBC for PV applications without Isolation Transformer
Installation of PV system was very costly at the starting of
solar system, now its cost is very much reduced almost
about 50%. The seasonal condition in India is better for PV
system. Most parts of India are blessed with lot of sun
lights. Only requirement is to store and use for the
applications. When some applications need to drive only
in one or two hours a day, even storage can be avoided.
Fig.2 Proposed IBC without isolation Transformer
As long as circuit working with the load, series connected
isolation switch is in the on state. When the power circuit
doesn’t require driving the load, it has to be disconnected.
Otherwise passive components, especially inductor should
not effect on the source. Hence now the isolation MOSFET
disconnects the load from the source. The proposed circuit
is same as the two stage IBC with modification such that
connecting two switches in parallel. The isolating MOSFET
switch is controlled by micro-controller that also monitors
the output voltage across the load and input voltage
provided by the source.
Simulation and hardware implementation
Simulations are carried out for both conventional IBC and
also propose IBC. Fig.3 is the simulation circuit of
proposed IBC. Fig. 4 shows the inductor current of the
converter are at 180° out of phase that reduces the ripple
current in the system. Simulation results of designed
values of current, voltage and power are as shown in Fig.
5. In the proposed IBC, since two switches are connected
in parallel, the current stress on switches is decreased by
half compared to conventional IBC, shown in Fig. 6 and
Fig.7. Even at high value of duty cycle proposed converter
is able to drive maximum load as shown in Fig.8.The circuit
connection of peripheral interface controller (PIC
microcontroller) Fig.9 for the operation to control of
isolation switch in the proposed work. The developed
prototype is shown in Fig.10.
Fig.3 Simulation circuit of proposed converter
Fig.4 Inductor currents of proposed IBC

3. High Voltage Gain with low Current Stress Interleaved Boost Converter for Photo-voltaic System
Int. Res. J. Power Energy Engin. 037
Fig.5 Output current, voltage and power waveforms
Fig. 6 switching current waveforms of SW1 and SW2 of
conventional IBC
Fig. 7 switching current waveforms of SWA and SWB
proposed IBC
Fig.8 Output voltage, current and power at different duty
cycle
Fig.9 Microcontroller interfacing circuit for proposed
system

4. High Voltage Gain with low Current Stress Interleaved Boost Converter for Photo-voltaic System
Prasanna and Mahesh 038
Table 1: Parameters and their values considered for
hardware development
S/No. Parameter Values
1 Input voltage(Vin)(Volts) 48
2 Input current (Iin)(Amps) 14
3 Output voltage(Vo)(Volts 210
4 Output current (I0)(Amps) 3.0
5 Output power (Po)(Watts) 630
6 Values of L1 and L2 (µH) 350
7 Switching Frequency(kHz) 20
8 Efficiency (%) 93
Fig.10 Developed prototype with voltage and current
readings
CONCLUSION
The development of about 600W modified IBC is designed
and developed without isolation transformer. In the
proposed circuit, MOSFET switch between source and the
converter. It provides physical isolation for the source from
the load. It has better efficiency about 93%. In the
proposed work no leakage reactance during no-load
condition, hence it optimizes power consumption.
Controlled IBC with parallel switch is the better choice for
the PV system. Complete analysis of the operations and
the performances of the proposed converter are
presented. Proposed IBC current stress is half of the
conventional IBC. The proposed work can be extended
with digital controller for closed loop operation for high
rating applications
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Accepted 23 October, 2017
Citation: Prasanna KC and Mahesh M (2017). High
Voltage Gain with low Current Stress Interleaved Boost
Converter for Photo-voltaic System. International
Research Journal of Power and Energy Engineering, 3(2):
035-039.
Copyright: © 2017. Prasanna and Mahesh. This is an
open-access article distributed under the terms of the
Creative Commons Attribution License, which permits
unrestricted use, distribution, and reproduction in any
medium, provided the original author and source are cited.