- 學位論文
單電感雙輸出的降壓和升壓直流對直流轉換器於虛擬連續傳導模式之分析與模型建立
Analysis and Modeling of SIDO Buck-Boost DC-DC Converter Operating in PCCM
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摘要
本篇論文針對操作於虛擬連續信號模式之單電感雙輸出的升降壓切換式直流對直流轉換器進行分析與模型建立。並依此分析結果以MATLAB建立自動設計平臺SIDOLA。設計者只須於圖形介面輸入轉換器需求，SIDOLA即可計算系統及電路參數，並自動模擬相互/線性/負載的調節、 暫態響應和分析轉換器的穩定性。 由於兩個輸出節點之間存在交叉干擾，對系統的穩定性存在一定的影響，使得轉換器系統回授關係變得複雜；也因此，必須特別加強穩定性分析與補償設計，由相位邊界和奈奎斯特分析去判斷補償系統和轉換器模擬結果的穩定性。我們特地利用SIDOLA 試算一個實例，藉由 SIDOLA 所計算出設計參數，並使用HSPICE以台積電 0.35um 2P4M CMOS 製程參數來實現電路。根據模擬的結果 此直流對直流轉換器的最大輸出漣波電壓在23毫伏以下，而輸出電流範圍在40mA到120mA之間。直流對直流轉換器之操作頻率為0.3百萬兆赫。在輸入電壓範圍在1.8V到2.0V之間，產生升壓及降壓的輸出電壓為 1.2V和2.4V。
並列摘要
In this thesis, a single-inductor-double-output (SIDO) switching DC-DC converter in operating pseudo continuous conduction mode (PCCM) is studied. The system is thoroughly analyzed and the steady-state as well as the small signal models is established. Based on the models, an automatic design platform, SIDOLA, in MATLAB is built such that according to the provided system requirements, SIDOLA can generate all the required design parameters as well as the corresponding behavioral simulations including line/load/cross regulations, transient responses and stability analyses. Special efforts have been made for system stability analysis while there exist cross interferences between the two output nodes. Due to the cross interferences, the feedback system becomes complicated; therefore, sophisticated compensation schemes for system stability have been proposed and the results are examined by means of phase margin tests and Nyquist analyses. Following the design parameters calculated by SIDOLA, an HSPICE model of a design example was made in the TSMC 0.35um 2P4M CMOS process. According to the simulation results, the maximum peak-to peak output voltage ripple is less than 23mV and the output current ranges are between 40mA and 120mA. The DC-DC converter operates at a frequency in 0.3 MHz and a supply voltage ranging from 1.2 to 2.4V. The buck and boost output voltage holds 1.2V and 2.4V.
參考文獻
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