基于改進啟動回路的反激式開關電源設計

摘要：本文以電流型脈寬調制芯片UC3844B為核心，設計了一種高效的單端反激式隔離輸出電源系統,對開關電源的設計原理、各組成模塊的功能以及工作過程進行了分析，并對傳統的啟動電路進行改進設計。實驗結果表明，開關電源具有良好的工作性能，改進型啟動電路能夠有效縮短啟動時間，避免直流母線側能量的浪費，提高了效率。 敘詞：反激式開關電源 UC3844B 改進型啟動回路 Abstract：In this paper, an efficient flyback switching power was designed by using current type controller UC3844B. At the same time, the design principle of the switching power, the module functions and working process were analyzed. Experimental results show that the switching power supply has a good performance; the improved starting circuit can effectively shorten the starting time, avoid the DC side energy waste and improve the efficiency. Keyword：Flyback switching power, UC3844B, Improved starting circuit