以平均電路法為基礎應用於DC-DC轉換器之拓樸分析

Base on Average Circuit Method Applied to the DC-DC Converter Topology Analysis

林嘉頡(Jia-Jie Lin)

指導教授 ： 曾國雄

國立臺北科技大學/電資學院/電機工程系研究所/碩士(2014年)

摘要

本論文提出以平均電路法為基礎之建模方法，解決傳統推導方法會喪失原電路架構之問題，其方法為分析開關網路之導通/截止狀態，並以相依電壓源或相依電流源取代時變開關，如此既能保留原架構，還能解決因時變開關之導通/截止造成計算轉移函數困難之問題。本研究之重點包括：(1)保留原架構，從相依源位置了解時變開關位置，並能消除開關之時變特性(ON/OFF)；(2)能夠運用於多開關網路與多種工作模式之開關網路，改善傳統分析方法以及以往文獻中只能使用在雙開關網路之問題；(3)藉由相依源等效電路，分析其迴路方向與極性，可以得知是否有影響該電路之零點，無須經由繁瑣之數學運算、推導。
為驗證所提出之方法，本研究將針對一具有三開關網路之降壓電路拓樸，分析該小訊號平均方程式，並推導轉移函數，設計控制器，達到輸入5V/輸出3.3V之降壓功能。本實做電路之控制方式採用數位控制，使用德州儀器公司生產之數位訊號處理器(DSP, Digital Signal Processor):TMS320F28027，利用程式語言實現數位控制，透過數位比例積分控制器與PWM產生器，控制功率開關，使系統於不同負載皆能穩定輸出3.3V。

關鍵字

平均電路法 ； 開關網路 ； 等效相依源電路 ； 拓樸分析

並列摘要

This thesis presents the modeling which is based on averaging circuit to solve the problem of traditional derivation method will lose the original circuit structure, whose approach to guide the analysis of the switching network on / off, and replace the time-variable switch become to dependent voltage source or current source. It’s not only retain the original architecture, but also eliminate time-varying issues with ON/OFF. The focus of this research include: (1) Retain the original structure, find the switch position from a dependent source location, and can be derivation small signal model or circuit transfer function by dependent source; (2) Can be used in multi-switch network with a variety of operating modes in the switch network, improving traditional methods and previous literature only in the dual switching issues; (3) By analysis dependent source circuit direction and polarity can be know whether it will affect the zero point of the circuit, without going through the difficult mathematical calculations derived.
To prove the proposed methods, this study will have a step-down circuit topology for a three-switch networks. Calculate the small-signal averaging equation and derive the circuit of the controller to obtain buck circuit which is 5V to 3.3V. The control of this circuit is used digital control. The Digital Signal Processor is using TMS320F28027 produced by Texas Instruments. Use programming language to implementation digital control. Through a digital proportional-integral controller with PWM generator to control power switch and allowing the system output 3.3V on different load.

並列關鍵字

Average circuit method ； switching network ； equivalent dependent source circuit ； topology analysis

參考文獻

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