An Efficient High-Step-Up Interleaved DC–DC Converter with a Common Active Clamp IEEE Electrical Projects


This paper now a high-efficiency and high-step up non isolated interleaved dc–dc converter with a common active clamp circuit. In the given 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 now in the practical coupled inductors, to a low voltage level.The leakage power of the interleaved converters are collected in a clamp capacitor and recycled to the output by the clamp boost converter. The planned converter obtain 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 planned converter are carried out. A prototype of the planned converter is developed, and its experimental results are given for validation.


  1. Active-clamp
  2. Boost converter
  3. Coupled-inductor boost converter
  4. Dc–dc power converter
  5. High voltage gain
  6. Interleaving




 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).



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).


 Coupled-inductor boost converters can be interleaved to obtain high-step-up power conversion without intense duty ratio operation while neatly 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 now in the non ideal coupled inductor.


The given active clamp circuit, based on single boost converter, can successfully reduce the voltage stress of the switches close to the low-level voltage stress provide by an ideal coupled-inductor boost converter. The common clamp capacitor of this active-clamp circuit collects the leakage power from all the coupled-inductor boost converters, and the boost converter recycles the leakage power to the output.


Detailed analysis of the operation and the work of the planned converter were given 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 obtain high ability for high-step-up power change.


A original of the converter was built and tested for confirmation of the operation and work of the planned converter. The experimental results agree with the analysis of the converter operation and the determined ability of the converter.


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[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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