energies Article A High-Power-Density Active-Clamp Converter with Integrated Planar Transformer Dae-Woo Lee 1 , Ji-Hoon Lim 2, Dong-In Lee 2 and Han-Shin Youn 2,* 1 Department of Electrical Engineering, Inha University, Incheon 22212, Korea; skydrum32@inha.edu 2 Department of Electrical ...