一次側控制的返馳式轉換器具有體積小及輕載高效率的優點，但是當一次側控制的返馳式轉換器操作於間歇模式，控制器無法偵測輸出資訊，因此不易精確控制輸出電壓。本論文設計與研製一具間歇模式交流轉直流返馳式轉換器之一次側控制晶片，當返馳式轉換器由重載進入輕載，其工作模式會由不連續導通模式轉為降頻模式。而於極輕載進入間歇模式時，利用輔助繞組映射輸出電壓來偵測開關工作時間，並估算開關不工作的時間，以控制輸出電壓漣波。本文所提之控制電路是利用一定電流源在間歇模式下開關工作的時間對一電容充電，再藉由電壓控制電流源將電容電壓轉成另一電流源，並對另一電容充電到某一定值，此充電時間即為開關不工作的時間。最後，本控制晶片使用TSMC 0.25 μm CMOS 高壓製程實現並將其應用於一輸入電壓90-130 Vrms，輸出電壓15 V，輸出功率為30 W的返馳式電源轉換器以驗證此控制晶片的可行性。

The advantages of the flyback converter with the primary-side regulation (PSR) are small size and high efficiency at light load. However, when the PSR flyback converter operates in burst mode, the controller is not able to sense the output information. Therefore, it is not easy to control the output voltage precisely. An integrated circuit design for AC-DC flyback converter using primary-side controller with burst mode energy saving is proposed in this thesis. As the load decreases, the flyback converter operates from discontinuous conduction mode to frequency reduction mode. At extremely light load, the flyback converter operates in burst mode. With the proposed control, the burst-on time is detected by the voltage across the auxiliary winding, and the burst-off time can be estimated to control the output voltage ripple. In the proposed control circuit, a capacitor is charged by a constant current source during the burst-on time, and the capacitor voltage is transferred to a controlled current. Therefore, the required burst-off time can be obtained by using the controlled current to charge another capacitor until it reaches the reference voltage. Finally, this controller is fabricated with TSMC 0.25 μm CMOS high voltage mixed signal general purpose process. The flyback converter with the input voltage range of 90-130 Vrms, the output voltage of 15 V, and the output power of 30 W is implemented to verify the feasibility of the proposed controller.

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