A 480W 40-to-60VIN Quadrangle Controlled Four-Switch Buck-Boost Converter with Zero-Freewheeling and Reverse Inductor Current Supply Techniques Achieving 99% Peak Efficiency. - Dongjie Ye; Zeguo Liu; Chengzhang Luo; Qinyang Wang; Xu Han; Lin Cheng (ICTA, 2024)