| Title |
A High Power Density Active-Clamp Forward-Flyback Converter with Three Planar Transformer for xEV Low Voltage DC-DC Converter |
| Authors |
권경현(Gyeonghyun Kwon) ; 이동인(Dongin Lee) ; 정성욱(Seongwook Jeong) ; 정연호(Yeonho Jeong) ; 윤한신(Hanshin Youn) |
| DOI |
https://doi.org/10.5370/KIEE.2025.74.3.468 |
| Keywords |
Low Volatage DC-DC Converter; Active-Clamp Forward-Flyback; Integrated Transformer; Planar Transformer; High-Frequency Transformer. |
| Abstract |
This paper proposes an Active-Clamp Forward-Flyback (ACFF) converter with three planar transformers to achieve 4 kW output power. As autonomous driving technology rapidly advances, the demand for higher output power from low-voltage DC-DC converters (LDC) in electric vehicles has significantly increased. Conventionally, two 2 kW ACFF converters with four magnetic cores connected in series-parallel have been used to meet 4 kW power requirement, but this configuration has proven inefficient in terms of size, power density, and cost. The proposed converter improves power density by integrating the four magnetic cores of the conventional 4 kW ACFF converter into three, reducing the overall magnetic volume and allowing for a more compact design.
Furthermore, the use of planar magnetic components enables the winding to be embedded in a 4-layer PCB. |