一次側控制返馳式轉換器之研製

Design and Implementation of a Flyback Converter with Primary Side Control

陳炳勝(Ping-Sheng Chen)

指導教授 ： 歐勝源

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(2014年)

https://doi.org/10.6841/NTUT.2014.00344

摘要

本論文主要研製一次側控制返馳式轉換器，電路中使用輔助繞組感測輸出電壓，達到輸出電壓或電流的調節，而不需要使用額外的光耦合器、TL431、誤差放大器等元件進行輸出回授，就可以具有定電壓、定電流的功能。本論文所研製之返馳式轉換器操作在不連續模式，使用脈波頻率調變，在輕載時降低工作頻率，以減少功率開關的切換損失，在滿載時則提高工作頻率，以減少導通損失。然而輔助繞組感測到的電壓，會受到漏感、繞線不確定性以及鐵芯非線性特性等影響，因此於本論文中，將使用具有一次側控制的IC，並詳細敘述所提架構之操作原理與理論分析，最後經由實作結果驗證所研製之系統具有良好的動態負響應輸出電壓。

關鍵字

返馳式轉換器 ； 一次側控制 ； 脈衝頻率調變

並列摘要

This thesis is to develop a flyback converter with primary side control in which an auxiliary winding is used to sense the output voltage and achieve the regulation of the output voltage or current without using additional optical coupler, TL431 and other components to constuct the error amplifier for output feedback.
The implemented flyback converter operates in DCM and the pulse frequency modulation is utilized. The switching frequency is lowered for light-loads to reduce the switching losses of the power switch and the frequency is modulated to be higher for heavy-loads to reduce conduction losses.
In the conventional flyback converters, the sensed auxiliary winding voltage is subject to leakage inductance, winding uncertainty and the core nonlinear so that the output voltage response is poor. In this thesis, a primary side control IC is used to improve the dynamic response, theoretical analysis of the implemented system is provided and the experimental results connect the good dynamic response of the output voltage.

並列關鍵字

Flyback converters ； primary side control ； pulse frequency modulation

參考文獻

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