High Step-Up Resonant DC–DC Converter With Ripple-Free Input Current for Renewable Energy Systems

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Abstract
In this paper, we propose a high step-up resonant dc-dc converter with ripple-free input current for renewable energy systems. We use an input-current doubler and a switching mechanism employed at an output-voltage doubler to achieve high step-up voltage gain without having to use a transformer with high turns ratio. An active-clamp circuit installed on the primary side suppresses the surge voltage at the switch components and recycles the energy stored in the leakage inductance. A resonance that occurs at the secondary side of the converter is used to reduce the turn-off current and switching loss significantly, and to achieve high power conversion efficiency. The input-current ripple declines to zero theoretically because the duty cycle of the primary-side switches is always set to 0.5 regardless of the input voltages and load variations. The circuit operations, steady-state analysis, and design guideline of the proposed converter are also presented. A 600-W prototype converter has been fabricated to demonstrate the performance of the proposed converter.
Funding Information
  • Ministry of Science, ICT and Future Planning (MSIP), South Korea
  • ICT Consilience Creative Program (IITP-R0346-16-1007)
  • Institute for Information & Communications Technology Promotion (IITP)
  • National Research Foundation of Korea (NRF)
  • MSIP (2017R1C1B1003084)
  • NRF (2017K2A9A1A01092616)

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