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Title: | 應用於 CMOS 生醫系統單晶片之無線充電暨電源管理系統 Wireless Charging and Power Management System for CMOS Biomedical SoCs |
Authors: | Chung-Yu Chen 陳重佑 |
Advisor: | 呂學士 |
Keyword: | 直流-直流轉換器,電源管理,電池充電器,啟動電路,無線傳電, DC-DC converter,Power management,Battery charger,Start-up converter,Wireless power, |
Publication Year : | 2015 |
Degree: | 碩士 |
Abstract: | 隨著醫療電子的快速成長,再加上半導體製程的微縮,在 CMOS 生醫系統單晶片上可以擁有更多不同功能的電路,如類比前端電路(AFE)、生醫感測電路(Biomedical Sensor)、類比數位轉換器(ADC)、射頻接收/傳送器(RF TX/RX)、數位信號處理(DSP)等,且在省電/高效能等不同操作狀態下,各電路所需的電壓也隨之改變,因此電源管理積體電路(PMIC)在系統單晶片中扮演著不可或缺的角色。
直流-直流轉換器最常使用在電源管理(Power management)電路中,可大致分為線性穩壓器(LDO)、電感式切換直流-直流轉換器(Buck/Boost converter)、電容式切換直流-直流轉換器(Switched capacitor DC-DC converter),其差別在於操作模式及儲能元件。由於電感式切換直流-直流轉換器具有較高的轉換效率,近年來成為研究的趨勢。 以此為主軸,本文提出一可無線充電(Wireless charging)之電源管理介面電路作為起頭。以無線電波的方式傳送,由接收端的交流-直流整流器(Rectifier)將電波加以整流,提供一個穩定的電壓進入充電電路(Charger)對電池進行充電,可應用於密閉式或植入式之醫療器材上。接著,電源管理電路,供給系統單晶片上各個不同電路,且搭配溫度感測及控制之電路,防止系統單晶片工作時的溫度異常。 此外,本文提出一光伏(Photovoltaic)能源採集暨電源管理介面電路,用以儲存由光伏電池、太陽能電池等光源產生之低電壓能量。由直流升壓電路(Boost converter),提供一個穩定的電壓進入充電電路(Charger)對電池進行充電,且藉由電池管理(Battery management),分別偵測、提示電池的過度充電(Overcharging)或是未過充電(Undercharging)。 本文中提出之電路前者使用聯電 0.18 微米製程,後者使用台積電 0.35 微米製程。 Owing to growing rapidly bio-medical electronics and the shrink of the semiconductor fabrication, CMOS biomedical SoCs can have more various circuits such as analog front end, biomedical sensor, analog to digital converter, radio frequency transmitter, radio frequency receiver, digital signal processing and so on…. Then, eachoperation voltage of circuits needs to change with low power operation or high performance operation. In addition, power management integrated circuits (PMICs) play an important role in SoCs. In a wide range of power management ICs, we distinguish roughly among low-dropout regulator (LDO), inductor based switching DC-DC converter and capacitor based switching DC-DC converter whose difference lie in operation mode and energy storage elements. Recently, Inductor based switching DC-DC converter becomes more and more popular due to whose efficiency is the highest of power management ICs. To begin with, a wireless charging and power management interface is reported. In order to apply to implantable or hermetical biomedical devices, the full bridge AC-DC rectifier can receive power and provide a charging voltage for the battery charger with wireless powering. Following, power management supply different sub-circuits of the SoCs. With a temperature sensing and controlling circuit we proposed, the power management unit (PMU) is able to prevent abnormal temperature of the SoCs. In addition, we presented a photovoltaic energy harvesting and power management interface circuit, which extracts a power from PV cell or solar cell to the switching DC-DC boost converter. The li-ion battery charger can charge the battery with a stable dc voltage which generated by the boost converter. By detecting the status of the battery, battery management turns the charging mode on smartly. The former work is fabricated in UMC 0.18μm process, the latter work is fabricated in TSMC 0.35μm process. |
URI: | http://tdr.lib.ntu.edu.tw/jspui/handle/123456789/19901 |
Fulltext Rights: | 未授權 |
Appears in Collections: | 電子工程學研究所 |
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ntu-104-1.pdf Restricted Access | 2.87 MB | Adobe PDF |
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