Mobile QR Code QR CODE : The Korean Institute of Power Electronics
Title 25 kW, 300 kHz High Step-Up Soft-Switching Converter for Next-Generation Fuel Cell Vehicles
Authors Sunju Kim ; Hai Ngoc Tran ; Jinyoung Kim ; Huu-Phuc Kieu ; Sewan Choi ; Jun-Sung Park ; Hye-Sung Yoon
Page pp.404-410
ISSN 1229-2214
Keywords DFOBC; FCEV; Soft-switching; ZVT (Zero-voltage-transition) cell; Planar coupled inductor
Abstract This paper proposes a high step-up converter with zero-voltage transition (ZVT) cell for fuel cell electric vehicle. The proposed converter applies a ZVT cell to a dual floating output boost converter (DFOBC) so that not only the main switch but also the ZVT switch can achieve full-range soft switching. The current rating of the ZVT switch is 17% of the main switch. The proposed converter has high reliability in that no timing issue occurs. Therefore, online calculation is not required. The minimum turn-on time of the ZVT switch that guarantees soft switching at all loads and input/output voltage is obtained by analysis. In addition, the proposed DFOBC allows the use of a 650 V device even at 800 V output and has the advantage of being able to boost the voltage by 3.5 times with 0.56 duty. Planar coupled inductor with PCB winding was successfully implemented with the converter operated at 300 kHz. The 25 kW prototype achieves peak efficiency of 99% and power density of 63 kW/L.