International Journal For Multidisciplinary Research

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Bidirectional Cllclc DC-DC Converter Based on Adaptive Excitation Inductor

Author(s) Mr. Vankadoth Chakravarthy Naik, Dr. Neela Rajesh kumar Gowd
Country India
Abstract Bidirectional DC–DC converters are important in modern energy systems because they allow efficient power transfer between sources and storage. Conventional LLC and CLLC resonant converters can experience efficiency degradation when a wide voltage-gain range and bidirectional operation are required.
The project proposes a CLLCLC resonant converter using an adaptive excitation inductance. An Lp–Cp series branch replaces the fixed excitation inductance so that the equivalent excitation inductance changes with operating frequency. This reduces circulating current and improves energy-transfer efficiency.
A hybrid control approach using frequency modulation and phase-shift control is considered to maintain soft switching. The proposed topology is intended for energy-storage charging/discharging systems, electric vehicles, DC microgrids and UPS applications.
• Adaptive excitation inductance changes with operating frequency.
• Wide voltage-gain operation is achieved with a narrower operating-frequency range.
• Soft switching such as ZVS/ZCS reduces switching losses.
• The proposed structure uses a relatively simple resonant network and reduces control difficulty. The original report states that a 200 W experimental prototype achieved maximum transmission efficiency of about 97.8% in forward mode and 94% in reverse mode.
Keywords Bidirectional DC–DC Converter, CLLCLC Resonant Converter, Adaptive ExcitationResonant Converter, Wide Voltage Gain, Soft Switching, Zero-Voltage Switching (ZVS), Zero-Current Switching (ZCS), Frequency Modulation,
Field Engineering
Published In Volume 8, Issue 4, July-August 2026
Published On 2026-08-28
DOI https://doi.org/10.36948/ijfmr.2026.v08i04.86187
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CrossRef DOI prefix of IJFMR is 10.36948/ijfmr

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