應用於穿戴式裝置之低功耗升壓型穩壓電路設計

近年來，由於智慧型手機市場趨近飽和，穿戴式電子產品逐漸興起，許多不同類型的穿戴式裝置相繼被開發出來，而穿戴式產品的電源系統必須能滿足長時間配戴的需求。本論文實現一個應用於穿戴式裝置的低功耗之升壓型切換式穩壓器電路，由於負載端的應用範圍均在輕負載，因此電路的架構選用電流限制脈波頻率調 (Current Limited PFM)，系統工作於不連續導通模式 (Discontinuous Conduction Mode，DCM)，可以根據不同的輸出負載電流來進行切換功率電晶體開關的頻率，進而提高整體電路的效率，對穿戴式裝置能有效的延長電池操作時間。本論文使用TSMC 0.18 µm 1P6M CMOS製程來設計與實現，整體電路的輸入電壓範圍為1.3 V ~ 2 V，負載電流範圍為1 mA ~ 50 mA，輸出電壓為3V。模擬結果顯示，漣波電壓小於輸出電壓5 %以內，線性調節率為6.79 mV/V，負載調節率為0.054 mV/mA，最佳轉換效率為88.6 %。

關鍵字

穿戴式裝置；脈波頻率調變；不連續導通模式

並列摘要

In recent year, due to the nearly saturation on smart phone market saturation, wearable electronic market products gradually rise. Many different types of wearable devices have been developed. The power supply system of wearable devices must be able to meet the needs of long-enough time operation. This thesis implements a low power boost converter for wearable applications. Due to the load sides of the applications are restricted in a light load, a boost converter with current limited pulse frequency modulation (PFM) operated in discontinuous conduction mode (DCM) is proposed for low power and high efficiency. The switching frequency of the control pulse of power transistor is varied according to the load current condition to greatly improve the conversion efficiency. Thus, the wearable devices can effectively extend their battery operating time. In this thesis the boost converter is designed and implemented with TSMC 0.18μm 1P6M CMOS process. The converter accepts an input voltage of 1.3V ~ 2V, and generates a regulated output voltage of 3V with a load current range of 1mA ~ 50mA. The simulated results show that the ripple of output voltage is less than 5 %. The line regulation, load regulation, and conversion efficiency are 6.79 mV/V , 0.054 mV/mA , and 88.6 %, respectively.