應用於多相電壓調整器之數位控制器設計

Design of a Digital Controller for Multi-phase Voltage Regulator Applications

劉得民(De-Min Liu)

指導教授 ： 劉志文

國立臺灣大學/電機資訊學院/電機工程學研究所/碩士(2009年)

https://doi.org/10.6342/NTU.2009.03002

摘要

本論文提出一應用於二相交錯式電壓調整器(Two-Phase Interleaved Voltage Regulator, VR)之數位控制器，首先利用狀態空間平均法推導其小訊號模型，再以此小訊號模型為基礎，使用極零點消去法來設計補償器。控制策略採用了電壓控制模式，並且感測電感電流來完成增益規劃(Gain Scheduling)功能，建立查表，使補償器之參數可依不同負載情況做調整，以增進系統的動態響應。另外，加入了自動切相(Phase Shedding)技術，控制器可依負載情況決定操作相數，如此可改善輕載效率。
所設計之數位控制器經由Matlab®/Simulink®模擬，確認功能正確後，以場可規劃邏輯陣列(Field Programmable Gateway Array, FPGA)實現一輸入電壓為12V，輸出電壓為1.2V之二相交錯式電壓調整器的數位控制，實驗結果驗證了本論文之控制器設計。

關鍵字

二相交錯式電壓調整器 ； 數位控制器 ； 增益規劃 ； 切相

並列摘要

A digital controller for a two-phase interleaved voltage regulator is presented in this thesis. To begin, the small-signal model is derived using state-space averaging method. Based on the small-signal model, the design of the compensator is accomplished through the pole-zero cancellation method. The control scheme is set at voltage mode, and the inductor current is sensed to achieve Gain Scheduling function. A lookup table is established so the parameters of the compensator can be adjusted for different loading conditions— so that the dynamic response can be enhanced. In addition, as long as the auto phase shedding technique is used, the operating phase number can be determined according to the loading condition, and the light load efficiency will be improved finally.
The function of the designed digital controller is simulated and confirmed by using Matlab®/Simulink®.A digital controller for a 12V-to-1.2V two-phase interleaved voltage regulator is implemented using an FPGA(Field Programmable Gateway Array) board and the experimental results demonstrate the proposed controller design.

並列關鍵字

Two-phase interleaved voltage regulator ； Digital control ； Gain scheduling ； Phase shedding

參考文獻

[18] 黃鈺湧, 以FPGA實現直流/直流降壓型轉換器之PI控制與電流均流, 國立台灣大學電機工程學系碩士學位論文, 2008.

[20] 許志綸, 以FPGA實現直流/直流降壓型轉換器之數位可適性控制, 國立台灣大學電機工程學系碩士學位論文, 2008.

[2] Y.F. Liu and P.C. Sen, “Digital control of switching power converters,” IEEE CCA Conf., pp. 635-640, Aug. 2005.

[5] A. V. Peterchev, J. Xiao, and S. R. Sanders, “Architecture and IC implement of a digital VRM controller,” IEEE Trans. Power Electronics, vol. 18, pp. 356-364, Jan. 2003.

[6] A. Prodic, D. Maksimovic, and R. Erickson, “Design and implementation of a digital PWM controller for a high-frequency switching dc-dc power converter,” IEEE IECON’01 Conf., vol. 2, pp. 893-898, 2001