單級全橋式交/直流變通型轉換器之小訊號分析與並聯架構之電流均享設計

Abstract

本文旨在對一變通的單級全橋式交/直流電源轉換器作小訊號分析，並且以此電路為基本模組，於並聯架構中設計電流均享電路以實現模組擴充。該轉換器主要包含輸入電流修飾部分與全橋穩壓兩部分。電路主要特色為：使用一開關利用責任週期比加上盲點時間，來控制儲能電容電壓的最大值，並且修飾輸入電流提高電源側的功率因數。 文中針對此電路架構作開迴路小訊號分析，基於此小訊號分析，對轉換器設計迴授補償電路。並以此電路架構為基本模組，在輸入並聯輸出並聯的架構中，設計具有電流均享功能的電路。同時以Pspice模擬軟體，針對一部220V ac(r.m.s)輸入，且為660W/100V輸出的單級全橋式交/直流轉換器，並且符合規範IEC61000-3-2的雛形電路，進行電腦模擬以輔助相關的設計。

In this thesis, a detailed small-signal analysis of an improved single-stage full-bridge AC/DC converter, 220V input and 660W/100V output, is presented. A current sharing paralleled structure integrated by the proposed converters is also presented to realize an integrated power system. The converter was composed of two subcircuits: an input current shaper and a full-bridge regulator. The proposed circuit has two major merits: the maximum voltage across the bulk capacitor can be suppressed, and the input current satisfies IEC61000-3-2 Class A standard. The converters are connected in the input-parallel-and-output-parallel configuration. The system simulation and analysis had been successfully carried out in both Matlab and Pspice system for verification.