本論文主要針對切換式電源供應器的各種損失加以分析及探討，並提出降低各種損失的方法及比較各種方法的優缺點，最後實作一個15V/5.34A/80W輸出之電源供應器，以本論文所提各種降低損失的方法，針對此電源供應器之需求選擇適當的設計。本實作以L6561作為PFC之主控IC，並利用TEA1552作為DC-DC轉換器之控制IC，實現具有軟切換(Soft Switching)的電路設計架構，實作測量的結果與本論文中的論述十分相符。

The various causes of the power loss in a switch-mode power supply are analyzed in this thesis. Several strategies for improving the power conversion efficiency are discussed and evaluated. Some comments providing considerations to reduce the power loss during implementation of a switching power supply are given. A high-efficiency switching power supply of 80-W (15V/5.34A) output power is implemented. L6561 and TEA1552 are adopted as the control IC’s for the power factor corrector (PFC) and the DC-to-DC converter, respectively. Soft switching capability is observed. The experimental results of the implemented power supply are satisfactory and confirmed to the theoretical analysis.

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