第五章 電路模擬與實驗結果
6.2 未來研究方向
本文主動開關具漏電感能量回收之交錯型返馳式轉換器,經由電路模擬程式以 及實驗實際量測後,證明實驗結果與理論分析上相符,但電路仍有尚不完美的地方,
存在改進空間,下面為本文未來所需研究以及改進的列舉:
1. 控制電路數位化:
本文使用類比IC 電路,因 IC 不可程,限制了一些條件(如:不能改變責務比,使 得不能使用 PWM 方式調載穩壓)。使用數位控制電路取代類比 IC 電路,利用程式 語言控制驅動訊號,編寫程式並燒錄於數位控制電路內,即可達到與類比IC 電路一 樣之功能,電路控制更彈性化,修改程式也更為方便。
2. RC 緩衝器(RC Snubber):
緩衝器也稱緩振器,在主動開關的汲極(D)與源極(S)並聯一串電容 CS與電阻RS
如圖 6.1 所示。主動開關電壓在截止時會有一突波電壓,造成元件應力增大,可靠 度下降,藉由緩衝器之加入。將可吸收主動開關在截止時來至漏感的突波能量,讓 電能處理的控制能更順暢,也可以提升整體電路系統的可靠度,而RC Snubber 缺點 是會消耗些能量。所以總而言之,RC Snubber 主要用在吸收漏感或佈線的雜散電感 所儲存的能量,以便免造成雜訊流竄進而影響控制或訊號處理。
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圖6.1 轉換器之主動開關並聯 RC Snubber
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