切換頻率對電源供應器變壓器之影響與探討

Investigation into the Effect of Switching Frequency on the Transformer of Converters

梁志偉(Zhi-Wei Liang)

指導教授 ： 賴炎生

國立臺北科技大學/電資學院/電力電子產業研發碩士專班/碩士(2007年)

https://doi.org/10.6841/NTUT.2007.00049

摘要

本論文主要探討不同的切換頻率對切換式電源供應器中變壓器的影響，其目的是提高切換頻率來減少變壓器需要的感量藉以降低其尺寸與大小，其中分別利用順向式轉換器和返馳式轉換器來完成驗證，電路中使用UC3845控制晶片來達到50 kHz以及100 kHz兩種不同的切換頻率。
本論文首先介紹兩種架構的轉換器的原理，其次則詳述設計步驟並且列出所需要之元件規格，最後依照設計結果完成輸入電壓為48伏特，輸出電壓為12伏特且輸出功率為12瓦特之轉換器，同時量測其波形，最後比較切換頻率對變壓器體積與轉換器的影響，結果顯示增加切換頻率可大幅減少轉換器的體積並可藉此提高轉換器的功率密度。

關鍵字

電源供應器 ； 切換頻率 ； 變壓器

並列摘要

ABSTRACT

This thesis probes into the different switching frequency over to the influence of magnetic component in power supply mainly, its purpose is to improve switching frequency to reduce the inductance that converter need and use to reduce the converter size, among them make use of forward and fly-back converters to finish verifying separately, use control IC UC3845 to reach 50 kHz and 100 kHz two kinds of different switching frequency over in the circuit, At first, in thesis will analyze of the movement principle to the converters of two kinds of structure, Secondly, narrate the step of designing in detail and list the component specifications needed to use, At last, according to the design procedure stipulated，finish the operation of the specifications are as follows: input voltage = 48 V, output voltage = 12 V, output current = 1 A and output power = 12 W is built, At the same time quantity examines its wave form result, Then, compare the size of magnetic component in power supply in different switching over the difference under frequency.

並列關鍵字

power supply ； switching frequency ； magnetic component

參考文獻

[8] 賴建志，「具有同步整流技術之零電流零電壓柔切轉移順向式DC/DC電力轉換器之研製」，碩士論文，國立成功大學工程科學系，台南，民國93年7月。

[7] 黃柏騰，「符合待機規範之交流/直流轉換器的研製」，碩士論文，國立台北科技大學電機工程學系，台北，民國94年。

[12] A. I. Pressman, Switching Power Supply Design, America: McGraw-Hill Companies, 1999.

[14] C. D. Bridge, “Clamp voltage analysis for RCD forward converters,” IEEE APEC, pp. 959 - 965, 2000.

[15] J. A. Cobos, O. Garcia, J. Sebastian, and J. Uceda, “RCD clamp PWM forward converter with self driven synchronous rectification,” Proceeding IEEE IECON Conference, pp. 1336 - 1341, 1993.