本論文提出具一次側感測及準諧振控制之數位多模返馳式適配器，為了使系統在利用一次側感測的架構下進行包含CCM、DCM的多模操作，本論文提出一個數位控制電路實現中間點偵測，並根據中間點資訊完成線路負載壓差補償及電流估測，使系統具有在任何操作模式下皆可進行定電壓控制及定電流控制的功能。此外，本論文提出一個數位演算法判斷系統操作模式，使系統在DCM下以準諧振切換提升效率，並於CCM下自動轉為定頻切換。
本論文系統使用FPGA作為數位控制器搭配功率級PCB完成控制驗證與系統量測，證實系統符合現行適配器功能與規格標準。在系統功能方面，本系統包含定電壓控制、定電流控制及準諧振效率提升。在系統性能方面，本系統在輸入110Vac下的Voltage Regulation與Current Regulation分別達到±3.5%與±6.8%的成果。

In this paper, the research topic is study and design of digital multi-mode flyback adapter with primary-side sensing and quasi-resonant control. In order to make the system perform multi-mode operation including CCM and DCM under the architecture of using primary side sensing, this paper proposes a digital control circuit realize the mid-point detection, and complete the line load voltage difference compensation and current estimation based on the mid-point information, so that the system can achieve constant voltage control and constant current control in CCM and DCM. In addition, this paper proposes a digital algorithm to determine the operating mode of the system, so that the system can improve efficiency by quasi-resonant switching under DCM, and automatically switch to fixed frequency switching under CCM.
The system in this paper uses FPGA as a digital controller with a power stage PCB to complete control verification and system measurement, confirming that the system contains adapter functions and meets the specifications. In terms of system functions, this system includes constant voltage control, constant current control and quasi-resonant efficiency improvement. In terms of system performance, this system achieves ±3.5% voltage regulation and ±6.8% current regulation under 110Vac input.

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