Analysis and Design of Hybrid CCM Boost DC-DC Converter for High Voltage Gain

Author (s):

  1. A. Thiyagarajan, Karpagam Institute of Technology, Coimbatore, Tamilnadu, India,
  2. Dr.S.Chitra, Government College of Technology, Coimbatore, Tamilnadu, India
  3. K.Sivakumar, Sri Ranganathar Institute of Engineering and Technology, Coimbatore, Tamilnadu, India


Recently, DC-DC converters with high voltage gain are usually required in battery powered applications like renewable energy system, fuel cells, uninterrupted power supply and automotive application. These applications demand high step-up voltage gain, efficiency and reduced switching losses. Some classical converter with magnetic coupling can easily achieve high step-up voltage gain. The power transformer volume is a problem for the development of the compact converter. The energy of the transformer leakage inductance can produce high voltage stress, increases the switching losses and reducing the converter efficiency.In this work, a hybrid topology combines coupled inductor and voltage multiplier cell is proposed to provide high voltage gain. Coupled inductor boost converter is used to reduce the volume of the isolation transformer and provide the required high voltage gain, but with penalty of high voltage, current stress and high duty cycle operation. In voltage multiplier cell based dc-dc converter, the required voltage gain is obtained by adding required number of multiplier cells consisting of capacitors and diodes. The proposed hybrid converter is used to avoid the extreme duty ratios, high voltage stress, and large switching losses. The proposed hybrid converter is simulated and the results are obtained using MATLAB/Simulink software.

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