適用於動態電壓調整之單週期控制降壓電源轉換器且具有可節省功率的內嵌式動態寬度調整控制器

Abstract

本論文的內容主要是要設計一個適用於動態電壓調整的直流電壓轉直流電壓穩壓器，動態電壓調整是一種有效率的電源管理方式，由於其輸出電壓會不斷改變，因此在設計上和傳統的固定電壓輸出的穩壓器有所不同。本論文所採用的控制方式以前授控制為主，由於前授控制為開迴路控制，因此可調變的輸出並不會影響整個控制系統的穩定度，在設計上會比較容易，此外，前授控制的響應速度會比回授控制來的快，而且對輸入端的抗雜訊能力很高，也就是線上穩壓度相當好。然而，其負載穩壓度比較差，當輸出的負載電流產生變化時，輸出電壓將會隨之變化。因此我們加入了一個回授路徑來增加整個系統的負載穩壓度。再者，我們推導出在每一個情況下的功率電晶體的最佳尺寸，並配合功率電晶體陣列來動態地調整其尺寸，以提升整體的效能。除了應用在電源管理之外，輸出可調變的穩壓器還可以應用在射頻發射器上。使用一個可以追蹤封包大小而動態調整電源供應的穩壓器將使射頻發射器的效能更加提升。

This thesis proposes a novel DC-DC switching converter for dynamic voltage scaling (DVS) system that is a good architecture for extending battery life. Due to the adaptive output voltage, the design of the DC-DC converter is different from the conventional design with the fixed output voltage. In this thesis, the control method is based on the feed-forward control method. Because the feed-forward control loop is an open loop, the adaptive output voltage will not influence the stability of the system. It will make us design the chip more easily. Besides, the transient speed of the feed-forward control method is faster than that of the feedback control method. The line regulation of the feed-forward is better control method can immediately respond to it. In the other word, when a input terminal incurs which perturbation, the feed-forward control method can immediately respond it. However, the load regulation of the feed-forward control is bad, when the load current changes the output voltage may change, too. Thus, we add a feedback loop to improve the load regulation. Furthermore, we derive the optimal width of the power MOS and use the optimum power MOS array to increase the efficiency. Beside, the DC-DC converter can be used for the applications of the power management of RF portable devices. The method of power tracking the envelope of the RF spectrum will increase the efficiency of the transmitter.