本論文以數位控制實現適應性電壓準位模式之切換式降壓型直流-直流轉換器以多相電源並聯模組提供比單相高的電流給負載。另外，利用直流-直流轉換器各模組開關時間相互交錯，可減小輸出電壓之漣波。AVP模式控制可減少約一半輸出電容使用量而與一般模式有相同之輸出電壓變化量，比起一般模式節省體積與成本，且AVP模式可根據輸出電容之等效串聯電阻調整控制器參數達到電阻性輸出阻抗特性，使轉換器有較佳的負載效應。數位控制架構相較於類比控制，具可程式化特性，易於調整控制器參數來實現電阻性輸出阻抗。本論文針對所提出之轉換器電路架構，探討其動作原理及電路特性之分析，推導轉換器開迴路系統的小訊號模型，分析系統穩定度，並以此設計迴授補償器電路。最後實作一輸出規格為1.5V/10A雛型電路，以驗證本文所提出轉換器之性能及響應。

A digitally controlled interleave Buck converter with Adaptive Voltage Positioning (AVP) scheme is proposed in this thesis. The paralleled multi-module structure is applied to provide higher current to the load compared to the single-phase converter. In addition, the interleave characteristics can be realized in the multi-module paralleled operation to reduce output voltage ripple. The AVP control can save up to half number of the output capacitors compared to those in the ordinary voltage control for the same output voltage variation. Moreover, the AVP control mode provides the resistive output impedance characteristic to improve the load transient response of the Buck converter. Due to the programmability of the digital control configuration, the desired resistive output impedance can be easily tuned in accordance with the output capacitor’s equivalent series resistance.
The operating principles and circuit characteristics of the proposed converter are first introduced in this thesis. Following that, circuit stability is analyzed through the deduced small signal model of the open loop system for designing the feedback compensator. Finally, a prototype circuit is tested to evaluate the performance of the original design with output specifications of 1.5V/10A.

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