多路輸出反激式開關電源的設計與仿真

摘要： 在多路輸出電源系統的研究中，多路的設計一般是通過增加高頻變壓器繞組來實現，通常只能對主路輸出進行反饋調節，輔路往往達不到調節效果，會產生交叉調整率的問題。采用UCC28C43控制芯片設計了一款5 V/2 A、12 V/1 A、15 V/0.5 A的三路輸出反激式開關電源，在輸出電壓發生改變時，通過調節PWM輸出保證電源的穩定性。此外，為了改善負載的調整率，還對開關電源設計了零-極點補償網絡和基于加權電壓反饋的雙閉環反饋回路。在二者的共同作用下，負載調整率有了顯著的改善。最后，運用PSpice仿真軟件對開關電源的整體電路進行了建模設計，驗證了本設計的正確性。

關鍵詞： 反激式開關電源；補償網絡；高頻變壓器；PSpice仿真；負載調整率；多路輸出

中圖分類號： TM13；TN86" " " " 文獻標志碼： A

doi：10.3969/j.issn.2095-1248.2023.02.006

Design and simulation of multi-channel output flyback switching power supply

FENG Zhi-gang1， LYU Hong-wei1， XIAO Ling-jun 2， QI Yi-wen 1

（1. College of Automation， Shenyang Aerospace University， Shenyang 110136， China；

2. Beijing Aerospace Military Innovation Technology Co. ，Ltd， Beijing 100070， China）

Abstract：In the research of multi-channel power supply system，the design of multi-channel was generally realized by adding high-frequency transformer windings，but only the output of the main circuit could be adjusted by feedback usually.The auxiliary circuit often fails to achieve the adjustment effect，which will lead to the problem of cross adjustment rate.A three-channel flyback switching power supply with 5 V/2 A，12 V/1 A and 15 V/2 A was designed using UCC28C43 control chip.When the output voltage changes，the stability of the power supply was ensured by adjusting the PWM output. In addition，in order to improve the load regulation rate，a zero-pole compensation network and a double closed-loop feedback loop based on weighted voltage feedback were designed for the switching power supply.Under the joint action of them，the load regulation rate had been significantly improved.Finally，the whole circuit of switching power supply was modeled and designed by using PSpice simulation software to verify the correctness of this design.

Key words：flyback switching power supply；compensation network；high frequency transformer；PSpice simulation；load adjustment rate；multi-channel output

在工業自動化控制系統中，電源的穩定是控制電路、檢測電路、安全回路等正常工作的重要保證。隨著電子產品不斷更新換代，效率更高、功耗更低的高頻開關電源逐漸取代傳統的線性電源。開關電源是一種通過高頻變壓器將輸入與輸出進行隔離的電源變換器，包括AC/DC電源變換器、DC/DC電源變換器［1］。開關電源通過控制開關的導通和截止時間來調節占空比，并通過閉環控制技術來實現輸出電壓的穩定。目前，國內外很多研究主要集中在開關電源的工作過程和系統的優化改進上。文獻［2］根據二極管的穩壓原理，用PSpice搭建了內部電源電路，使電路可以在不同的高輸入電壓條件下穩定輸出5 V電壓。……