- 學位論文
峰值虛擬電感電流控制之四開關升/降壓轉換器 穩定度分析及改善
The Stability Analysis and Improvement of Four-Switch Buck/Boost Converter with Peak Virtual Inductor Current Mode Control
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摘要
近年來，微控器(MCU)時常被使用在眾多物聯網(IOT)的應用。為了為MCU這種應用供電需要具有升壓和降壓功能的DC轉換器以及快速的暫態響應。本論文將研究一種四開關降壓/升壓型DC轉換器。台灣新竹的Richtek公司為這種四開關電源轉換器提出了一個峰值虛擬電感電流模式控制方式（PVICM）。本文主要目的是建構出此種控制的小訊號模型。 本文的主要目的是建構出此種控制架構的小訊號模型。在論文中，將基於傳統電流模式控制所使用的修正型平均模型，開發PVICM控制的小信號模型，以及使用建立的模型，提出一補償器的設計流程。同一個補償器將需共用於降壓模式與升壓模式。除此之外，將比較PVICM控制與PCM控制所不同之處。在本論文會提出一Improved PVICM控制，其能在保有PVICM控制之好處下，改善PVICM控制的負載暫態響應。將使用模擬結果驗證建立的小訊號模型與提出的Improved PVICM控制。
並列摘要
In recent years, microcontrollers(MCUs) are often used in many internet of things applications. To power the MCUs for such an application, DC converters with both voltage boost and buck capability, and fast transient response are required. In this thesis, a four-switch buck/boost DC converters will be investigated. Richtek Corp. at Hsinchu Taiwan proposed a peak virtual-inductor-current-mode control (PVICM) for such a four-switch power converter configuration in which one compensation network is used for both the boost and the buck operation. The main purpose of the thesis is to develop a small-signal control model for such converter-controller configuration. In the thesis, small-signal models will be developed based on the traditional modified average model of current-mode control. Based on the model, a compensator design procedure will be developed. The same compensator must meet both the buck and the boost conversion mode of operation. In addition, a comparison among the PVICM control, the conventional peak current-mode control and the voltage-mode control is made from the view point of control transfer function.An Improved PVICM version is then proposed in this thesis to improve the converter transient response while preserving the advantages of PVICM control. Simulation results are used to confirm the small-signal model deveoped and the proposed Improved PVICM control.
參考文獻
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