简述如下用于驱动APD的开关型升压电路的升压过程 2、给定输入电压Uin=20V,开关占空比为δ=0.8,则理论输出电压Uo=? 1. Briefly describe the boosting process of the switch type boosting circuit used to drive APD as follows 2. If the duty cycle of the given switch is δ = 0.8, then the theoretical output voltage uo =?