二、如圖二所示之電源轉換器,假設所有元件皆為理想,各元件值如圖二所標示,若開關 S 之操作頻率 f = 20 kHz,責任週期(duty cycle)D = 0.4,且操作於邊界導通模式(boundary conduction mode, BCM)。請計算以下參數:
(e)漣波對輸出電壓之比值(the ratio of the ripple to the output voltage) (25 分)