功率積體電路於直流-直流降壓轉換器與鋰離子電池充電器之設計及其應用

Power IC Design and Application for DC-DC Buck Converter and Li-Ion Battery Charger

楊豐誠(Fong-Cheng Yang)

指導教授 ： 陳建中 ； 黃育賢

國立臺北科技大學/電資學院/電腦與通訊研究所/博士(2009年)

摘要

本論文的第一個部份，提出一個適用於可攜式裝置的新型電流感測電路，並且提出電流磁滯的操作方式使得系統的暫態反應較快。在此論文的直流-直流轉換器中，包含了功率電晶體，電壓對電流轉換器，非重疊電路，驅動電路，磁滯電路以及電流感測電路。 此外，此磁滯直流-直流降壓轉換器的暫態反應只有2微秒。此電路的本電路使用的是台積電0.35μm互補式金氧半製程，晶片面積為2.33 mm2。實測的結果中可知，最大效率可達89.1%。
而本論文的第二部份，我們實現一個可控制前端電源電壓的可變定電流晶片，利用可變電流源達到定電流、定電壓充電以及控制前端電源以達到高效率的目的。再者，此充電器是根據鋰離子電池的內電阻的變化來決定多模式的充電方式。此方式將可降低對鋰離子電池的損害。本電路使用的是台積電0.35μm互補式金氧半製程，此多模鋰離子充電器之平均效率可達到91.2%，並且適應性的參考電壓之精準度為97.3%，晶片面積為1.254 mm2

關鍵字

磁滯電流控制 ； 直流對直流轉換器 ； 電流感測 ； 高效率 ； 充電器

並列摘要

In the first part of this thesis, an integrated buck converter using current sensing circuit and hysteresis current controlled (HCC) techniques without slope compensation is presented. The proposed current sensing circuit is very simple and only consists of few components, which can be designed easily. The designed buck converter using the current sensing circuit and HCC techniques is stable even if the duty cycle is greater than 50%. Moreover, the transient response of HCC buck converter is only 2μs. The buck converter is implemented with a 3.3-V TSMC 0.35μm CMOS DPQM process, and the chip area is 2.33mm2 including I/O PADs. The efficiency is up to 89.1%.
In the second part of this thesis, we present a high-efficient multi-mode Li–Ion battery charger with variable current source and controlling previous-stage supply voltage. Using variable current source can achieve the goal of constant-current mode and constant-voltage mode to charge battery and control previous-stage supply voltage, which can increase the efficiency of the multi-mode battery charger. Moreover, the charging mode adopted in this charger is applied by two types of dual mode strategy and the charging strategy is decided by the value of the equivalent series resistance (ESR) of Li-Ion battery. This technique causes less damage to Li-Ion battery. The Li-Ion battery charger is designed with a 0.35μm CMOS DPQM process. The experimental results show that the charger works well and the theoretical analysis can be confirmed. The average power efficiency of the multi-mode Li-Ion battery charger is up to 91.2% under the average power of 1.24W, and the accuracy of the adaptive reference voltage is up to 97.3%. The chip area is only 1.254 mm2.

並列關鍵字

hysteresis-current-controlled ； dc-dc converter ； current sensing ； high efficiency ； battery charger

參考文獻

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