本論文主要目的係將雙模式控制法(Dual-Mode Operation)運用在升壓型主動功率因數修正器，當輕載時電路將會操作在準諧振模式(Quasi-Resonant Operation, QR)，以及臨界導通模式(Boundary Conduction Mode, BCM)達到當輕載時開關電壓能以較低的電壓切換以減少開關切換損失。當重載時操作於連續電流模式(Continuous Conduction Mode, CCM)，以解決前述兩種輕載模式在功率過大時開關損耗較大之問題。
本論文先就理想電路分析來說明所提出之功率因數修正器開關達到零電壓切換之條件以及電路動作。經過以上分析後，分別根據輕載的兩種模式製作兩台300W雙模式控功率因數修正器(Dual-Mode Operation Boost-Type Power Factor Corrector, Dual-Mode Boost PFC)，比較文中之分析與設計考量是否合理。實作電路之控制IC使用德州儀器所生產的UC3854，搭配自製外加控制電路，功率級採用升壓型轉換器電路架構。經測量結果證明開關在輕載可以減少損失，並且在較大負載能夠有較好的效率，以利電路往大負載發展。

This thesis aims to study a dual-mode boost-type active power factor corrector (PFC), Under light-load condition. the circuit is operated at a Quasi-Resonant (QR) mode or a Boundary Conduction Mode (BCM) to reduce switching losses. Otherwise. the circuit is operated at Continuous Conduction Mode (CCM) under heavy load condition to reduce the device current stresses.
Firstly, the operation principles and the zero-voltage switching condition for an ideal power factor correction are analyzed and discussed. Then, two 300W dual-mode boost-type power factor correctors are built and tested to verify the above theoretical analysis, The control circuits of the laboratory prototypes are implemented by using the Texas Instruments chip UC 3854 and external auxiliary circuits, The experimental results are shown to verify the feasibility of the studied schemes. High conversion efficiency can be achieved under light-load conditions and device current stresses can be reduced effectively under heavy-load conditions.

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