【摘要】：反激式變換器最初應用在汽車點火線圈中。今天，反激式開關(guān)電源在消費電子等領(lǐng)域廣泛應用。然而，反激式開關(guān)電源具有效率低的特點，如何降低它的工作損耗以提升工作效率，吸引了許多研究人員的注意。 本文詳細介紹了國內(nèi)外降低反激式開關(guān)電源損耗技術(shù)的研究現(xiàn)狀，深入分析了開關(guān)管占空比和輸出整流器占空比對反激式開關(guān)電源中所存在的6種損耗（包括開關(guān)管的開關(guān)損耗與導通損耗、輸入濾波電容器的損耗、變壓器繞組的損耗、輸出整流器的導通損耗、輸出濾波電容器的損耗）的影響。理論分析得出：（1）當開關(guān)管占空比增大時，它的關(guān)斷損耗呈現(xiàn)先減小后增大的規(guī)律，而輸入端的各部分損耗則越來越小，但減小的速度隨開關(guān)管占空比的增大而減小；（2）當輸出整流器占空比增大時，輸出端各部分的損耗和開關(guān)管的關(guān)斷損耗將變小，但它們減小的速度也隨著輸出整流器占空比的增大而減小。 本文設計了3組實驗進行驗證：（1）輸出整流器的導通占空比保持不變，只改變開關(guān)管占空比；（2）開關(guān)管的占空比保持不變，只改變輸出整流器的導通占空比；（3）同時以固定步長改變開關(guān)管占空比和輸出整流器占空比，該組實驗還通過搭建電路的方式進行了驗證。仿真實驗得出結(jié)論：當開關(guān)管占空比設定在0.45左右，輸出整流器占空比設定在0.55左右時，，反激式開關(guān)電源的效率最高。實驗結(jié)果驗證了理論分析。
[Abstract]:Flyback converters were initially used in automobile ignition coils. Today, flyback switching power supply is widely used in consumer electronics and other fields. However, flyback switching power supply has the characteristics of low efficiency. How to reduce its working loss to improve its efficiency has attracted the attention of many researchers. In this paper, the research status of reducing the loss of flyback switching power supply at home and abroad is introduced in detail. Six kinds of losses (including switching loss and conduction loss of switch tube, loss of input filter capacitor, loss of transformer winding) existing in switch duty cycle and duty ratio of output rectifier in flyback switching power supply are analyzed in depth. The effect of on loss of output rectifier and loss of output filter capacitor. The theoretical analysis shows that: (1) when the duty cycle of the switch tube increases, the turn-off loss decreases first and then increases, while the loss of each part of the input becomes smaller and smaller, but the decreasing speed decreases with the increase of duty cycle of the switch tube; (2) when the duty cycle ratio of the output rectifier increases, the loss of each part of the output end and the turn-off loss of the switching tube will become smaller, but their decreasing speed will also decrease with the increase of the duty cycle of the output rectifier. In this paper, three groups of experiments are designed to verify: (1) the duty cycle of the output rectifier remains unchanged, only the duty cycle of the switch tube is changed, (2) the duty cycle of the switch tube remains unchanged, only the on-duty ratio of the output rectifier is changed. (3) at the same time, the duty cycle of the switch and the duty cycle of the output rectifier are changed with the fixed step. The simulation results show that when the duty cycle of switch is about 0.45 and the duty ratio of output rectifier is about 0.55, the efficiency of flyback switching power supply is the highest. The experimental results verify the theoretical analysis.
【學位授予單位】：遼寧工業(yè)大學
【學位級別】：碩士
【學位授予年份】：2014
【分類號】：TM461

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