An efficient high step-up interleaved dc dc converter with a common active clamp

ELECTRICAL PROJECTS USING MATLAB/SIMULINK
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An Efficient High-Step-Up Interleaved DC–DC
Converter with a Common Active Clamp
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

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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).

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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.
.

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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.

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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).

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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.

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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.

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