以小訊號模型設計具高頻寬電壓控制之串聯諧振轉換器

High Bandwidth Voltage Controller Design for Series Resonant Converter using Small Signal Model

陳柏澔(Pro-Hao Chen)

指導教授 ： 黃明熙

國立臺北科技大學/電資學院/電機工程系所/碩士(2014年)

摘要

本論文主要是直觀方式推導串聯諧振轉換器之小訊號模型並對其控制器進行設計；轉換器小訊號模型分析分為軟體控制器和轉換器電路兩部分，軟體控制器由PI比例控制器及電壓至頻率轉換增益所組成。轉換器電路是假設輸出電容不大之前提，以電流源形式將能量傳遞至負載方法推導小訊號模型，隨後依據所訂電壓迴路規格，以Bode圖設計PI控制器之增益並於Simulink模擬環境分析設計結果。另外，為提高用電品質於串聯諧振轉換器輸入端串聯具主動功因修正之單相交流-直流轉換器。最後，於定電壓輸入下分析非對稱PWM及觸發模式控制對SRC輸出電壓與效率之影響。
為驗證所提設計方法之正確性，建構以數位訊號處理器作為控制核心之串聯諧振轉換器，使用頻率響應分析儀對所提SRC之小訊號模型及所設計控制器以實測方式進行驗證，測試結果與設計相當接近且電壓迴路頻寬可達2 kHz。

關鍵字

串聯諧振轉換器l ； 小訊號分析 ； 數位功率控制 ； 電壓控制器設計

並列摘要

This thesis presents a small signal analysis model of series resonant converter by intuitive method to design voltage controller. The small signal analysis of voltage controller is divided into software controller and hardware circuit. The software controller consists a PI controller and a voltage-to-frequency gain. The small signal model of hardware circuit is derived based on both that the output capacitor is small and the energy is transferred to load using constant current source. Thereby the gains of PI controller are yielded by Bode plot according to the specification of voltage loop. Moreover, simulated results by Simulink are carried out to analysis the controller design. In order to improve the power quality, a single-phase AC-DC converter with PFC is built and connected in the input of SRC. Finally, the influence of asymmetric PWM and burst mode control of SRC with fixed input voltage on output voltage and efficiency are analyzed.
In order to verify the correctness of proposed design method, a DSP-based SRC is constructed. The design result of controller and derived small signal models of SRC are all verified by frequency response analyzer, which shows that the tested results of SRC are closed to design results and the bandwidth of voltage loop is near to 2kHz.

並列關鍵字

Series Resonant Converter ； Small Signal Analysis ； Digital Power Control ； Voltage Controller Design

參考文獻

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