ABSTRACT:
This paper presents a high-efficiency and high-step up
non isolated interleaved dc–dc converter with a common active clamp circuit. In
the presented converter, the coupled-inductor boost converters are interleaved.
A boost converter is used to clamp the voltage stresses of all the switches in
the interleaved converters, caused by the leakage inductances present in the
practical coupled inductors, to a low voltage level. The leakage energies of
the interleaved converters are collected in a clamp capacitor and recycled to the
output by the clamp boost converter. The proposed converter achieves high
efficiency because of the recycling of the leakage energies, reduction of the
switch voltage stress, mitigation of the output diode’s reverse recovery
problem, and interleaving of the converters. Detailed analysis and design of
the proposed converter are carried out. A prototype of the proposed converter is
developed, and its experimental results are presented for validation.
KEYWORDS
1.
Active-clamp
2.
Boost
converter
3.
Coupled-inductor
boost converter
4.
Dc–dc power converter
5.
High voltage gain
6.
Interleaving
SOFTWARE: MATLAB/SIMULINK
CIRCUIT DIAGRAM:
Fig.
1. (a) Parallel diode clamped coupled-inductor boost converter and (b) proposed
interleaved coupled-inductor boost converter with single boost converter clamp
(for n = 3).
EXPECTED SIMULATION RESULTS:
Fig.
2. (a) Drain-to-source voltage of the switch in a coupled-inductor boost converter
without any clamping and (b) output voltage, clamp voltage and drain to- source
voltage of the switch in a coupled-inductor boost converter with the proposed
active-clamp circuit.
.
Fig.
3. (a) From top to bottom: total input current of the converter, input currents
of the interleaved coupled-inductor boost converters, and (b) primary current,
secondary current, and leakage current in a phase of the interleaved coupled-inductor
boost converters.
Fig. 4. (a) Gate pulses to the clamp boost
converter and (b) inductor current of the clamp boost converter.
Fig.
5. Gate pulses to the interleaved coupled-inductor boost converters (10 V/div).
CONCLUSION:
Coupled-inductor
boost converters can be interleaved to achieve high-step-up power conversion
without extreme duty ratio operation while efficiently handling the high-input
current. In a practical coupled-inductor boost converter, the switch is
subjected to high voltage stress due to the leakage inductance present in the
non ideal coupled inductor. The presented active clamp circuit, based on single
boost converter, can successfully reduce the voltage stress of the switches
close to the low-level voltage stress offered by an ideal coupled-inductor
boost converter. The common clamp capacitor of this active-clamp circuit collects
the leakage energies from all the coupled-inductor boost converters, and the
boost converter recycles the leakage energies to the output. Detailed analysis
of the operation and the performance of the proposed converter were presented
in this paper. It has been found that with the switches of lower voltage rating,
the recovered leakage energy, and the other benefits of an ideal
coupled-inductor boost converter and interleaving, the converter can achieve
high efficiency for high-step-up power conversion. A prototype of the converter
was built and tested for validation of the operation and performance of the
proposed converter. The experimental results agree with the analysis of the
converter operation and the calculated efficiency of the converter.
REFERENCES:
[1]
L. Solero, A. Lidozzi, and J. A. Pomilio, “Design of multiple-input power converter
for hybrid vehicles,” IEEE Trans. Power Electron., vol. 20, no. 5, pp.
107–116, Sep. 2005.
[2]
A. A. Ferreira, J. A. Pomilio, G. Spiazzi, and de Araujo Silva, “Energy management
fuzzy logic supervisory for electric vehicle power supplies system,” IEEE
Trans. Power Electron., vol. 20, no. 1, pp. 107–115, Jan. 2008.
[3]
A. Emadi, K. Rajashekara, S. S. Williamson, and S. M. Lukic, “Topological overview
of hybrid electric and fuel cell vehicular power system architectures and
configurations,” IEEE Trans. Veh. Technol., vol. 54, no. 3, pp. 763–770,
May 2007.
[4]
J. Bauman and M. Kazerani, “A comparative study of fuel cell-battery, fuel cell-ultracapacitor,
and fuel cell-battery-ultracapacitor vehicles,” IEEE Trans. Veh. Technol.,
vol. 57, no. 2, pp. 760–769, Mar. 2008.
[5]
Q. Zhao and F. C. Lee, “High-efficiency, high step-up DC–DC converters,” IEEE
Trans. Power Electron., vol. 18, no. 1, pp. 65–73, Jan. 2003.
