• 대한전기학회
Mobile QR Code QR CODE : The Transactions of the Korean Institute of Electrical Engineers
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  • 한국과학기술단체총연합회
  • 한국학술지인용색인
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Title Resonant Network Design of a Three-Phase Interleaved LLC Resonant Converter for Ultra-Fast Charging of Electric Vehicles with a Wide Output Voltage Range
Authors 김재원(Jae-Won Kim) ; 박수성(Su-Seong Park) ; 박해찬(Hae-Chan Park) ; 김래영(Rae-Young Kim)
DOI https://doi.org/10.5370/KIEE.2025.74.4.629
Page pp.629-634
ISSN 1975-8359
Keywords EV charging system; Three-Phase interleaved LLC resonant converter; Wide-range; High efficiency; High density
Abstract As the demand for electric vehicles continues to rise, the development of a high-power ultra-fast charging system with a wide output voltage range is essential to reducing battery charging time and extending driving range. The single-phase LLC converter, which achieves zero voltage switching over the entire operating range, is widely used as a DC-DC converter in electric vehicle charging systems. However, in high-power applications, increased input and output current ripple leads to higher system losses and larger volume. To address these challenges, a three-phase interleaved LLC converter is proposed to reduce input and output current ripple while enhancing system efficiency and power density. This paper presents the resonant network design of a 30 kW three-phase interleaved LLC converter with a wide output voltage range, intended for ultra-fast EV charging applications. The performance of the proposed system is verified through a prototype, achieving a maximum efficiency of 98.24% and a power density of 3,086 W/L.