時間電荷控制的電流模式降壓轉換器的設計

Design of A Current-Mode Buck Converter with Time-Charge-Based Control

羅翊方(I-Fang Lo)

指導教授 ： 林宗賢

國立臺灣大學/電機資訊學院/電子工程學研究所/碩士(2021年)

https://doi.org/10.6342/NTU202101081

摘要

本研究採用時間電荷控制法實現時域式降壓轉換器，以電流模式搭配固定品質因子技術因而能在超寬輸出輸入電壓範圍操作。本作品在六分之一切換頻率的頻寬下仍能維持低輸出阻抗並具有加速響應機制，因此當負載電流由0安培切換至1.5安培時，轉換器能夠在2 µs範圍內調節輸出電壓回穩態值，且電壓下降不超過90毫伏特。在搭配特定負載電路可以動態電壓調整以節省功率消耗，同時具有高增益電壓迴路使得電源電壓調整率及負載調整率各自小於1毫伏特/伏特及1毫伏特/安培。在此次設計除了電感以及電容兩顆元件外，剩下的被動元件皆實現在晶片中。本晶片以0.18微米之台積電互補式金氧半導體製程實現，晶片尺寸為1.2×1.3平方毫米，實現了高功率密度設計並具有最高效率為94.3 %。

關鍵字

降壓轉換器 ； 時域式控制 ； 適應性導通時間 ； 快速響應模式

並列摘要

This work adopts the time-charge-based control to implement a time-based buck converter, and uses current mode with fixed quality factor technique to operate in an ultra-wide output and input voltage range. In addition, this work can still maintain low output impedance and has the fast transient mode under the bandwidth of one-sixth of the switching frequency. Therefore, the converter can regulate the output voltage within 2.5 µs with less than 100 mV undershoot/overshoot when the load current changes from 0 A to 1.5 A. Moreover, it can support dynamic voltage scaling with a specific load circuit to save power consumption. This design features a high-gain voltage loop that makes the line regulation and the load regulation less than 1 mV/V and 1 mV/A, respectively. In addition to the inductor and capacitor, the remaining passive components are all in the chip. This chip is fabricated in TSMC 180-nm CMOS process and the chip size is 1.2×1.3 mm2 and achieves a 94.3% peak efficiency.

並列關鍵字

Buck converter ； time-based control ； adaptive on-time control ； fast transient mode

參考文獻

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