半橋式單級電力轉換器之小訊號分析與控制器設計

Small Signal Analysis and Controller Design of a Half-Bridge Single-Stage Power Converter

盧健昆(Lu, Jian-Kun)

指導教授 ： 歐勝源

國立臺北科技大學/電資學院/電力電子產業研發碩士專班/碩士(2008年)

https://doi.org/10.6841/NTUT.2008.00082

摘要

本論文以半橋式AC/DC功因校正電路與半橋式DC/DC轉換器為基礎，利用接枝法技術，將傳統具有功因校正電路之雙級式電力轉換電路合併成為單級式電力轉換電路，以設計出具有高功率因數的半橋式單級電力轉換器。
本論文架構之半橋式單級電力轉換器，當前級的半橋式AC/DC功因校正電路操作在不連續模式時，本質上具有相當良好之功因校正能力，故無需設計功因校正控制器。針對此單級電力轉換器，先作其電路原理分析，並探討負載變為輕載時，對儲能電容之影響。而本論文將單級電力轉換器中之兩電感器電流皆操作在不連續導通模式下，不但具有高功因的特性，同時可避免儲能電容高電壓應力的問題。
選定單級電力轉換器之操作模式後，利用狀態空間平均法，推導單級電力轉換器之直流工作點及小訊號數學模式，然後設計單級電力轉換器之元件規格。同時使用IsSpice模擬軟體驗證單級電力轉換器之直流工作點。
最後以實作來驗證小訊號正確性，且設計回授控制器電路，讓輸出電壓達到穩壓效果。由實測結果證實，當負載變動時，輸出確實可達到穩壓要求。

關鍵字

單級式 ； 半橋式DC/DC轉換器 ； 狀態空間平均法 ； 小訊號分析

並列摘要

In this thesis, a half-bridge AC/DC PFC converter with a half-bridge DC/DC converter is used as a fundamental study object. The conventional PFC two-stage power converter transform into single-stage power converter by the graft scheme. Moreover, the half-bridge single-stage power converter with the high power factor is proposed by these methods.
The half-bridge single-stage power converter proposed in this thesis has inherent gift of high power factor correction function (PFC), when the first stage operates in discontinuous conduction mode (DCM) mode. Hence the PFC controller is not necessary. For the proposed converter, the circuit operation principle is analyzed and the effect due to light loads on the voltage of bulk capacitor is also discussed. It is revealed that if the proposed converter is operating in DCM mode, it not only inherently has high power factor, but also avoids to suffer from high voltage stress across the bulk capacitor at light loads.
Having decided the operating mode of the converter, the state-space averaged model is used to drive the dc operating point and the small signal model. Then each component of the proposed converter is designed to satisfy the specifications. The operating point is ensured by IsSpice simulations.
Finally, experimental results are used to verify the accuracy of small-signal model. The voltage feedback controller is designed to regulate output voltage. The experimental results show that controllers can regulate the output voltage.

並列關鍵字

Single-stage ； Half-bridge DC/DC converter ； State-space averaged model ； Small signal analysis

參考文獻

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[15] 蕭賀璞，新型半橋式單級電力轉換器之研製，碩士論文，國立臺北科技大學電機工程系，台北，2007。

[17] 黃智強，半橋式功率因數修正器雙電容不平衡修正之研製，碩士論文，國立臺北科技大學電機工程系，台北，2007。

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