實現數位控制之LLC諧振轉換器

Implementation of an LLC Resonant Converter with Digital Control

陳宜宏(Yi-Hung 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(2010年)

https://doi.org/10.6841/NTUT.2010.00477

摘要

本論文主要著重在LLC諧振轉換器數位化之實現，經由數位訊號處理器產生固定50%責任週期的互補驅動信號，並以頻率調變使變壓器初級側漏電感、激磁電感、諧振電容及開關上的寄生元件產生諧振現象以達到一次側開關的零電壓及二次側開關的零電流切換來降低元件的切換損失，可有效提高系統效率；隨後於變壓器二次側加入同步整流使系統之效率進一步提升。
為建構完整之分析與設計環境，分別以IsSpice及MatLab建模進行電路與控制策略之分析與設計。最後以數位訊號處理器(Microchip dsPIC30F2023)作為控制核心，建構輸入電壓為400V，輸出為12V/17A之LLC諧振轉換器來驗證所提之模擬環境與控制策略之有效性。

關鍵字

諧振轉換器 ； 零電壓切換 ； 零電流切換 ； 同步整流

並列摘要

The object of this thesis fcouses on the implementation of a digitized LLC resonant converter, and its power flow is controlled by changing frequency of the square wave which is yielded a digital signal processor.Two inductors, one leakage inductance and one magnetizing inductance of transformer, and a capacitor connected in series are used to function LLC resonance, which makes the primary-side and secondary-side switches to reach zero-voltage switching and zero-current switching respectively. Due to the ZCS and ZVS yielded by the LLC converter, the switching loss is reduced and the system efficiency is enhanced. Furthermore, a synchronous rectification technique is added in the secondary side to increase the system efficiency.
In order to build up a complete development environment for analysis and design, the simulation models of LLC converter are established by both IsSpice and MatLab. Finally, an LLC converter with 400V input and 12V/17A output is operated by a Microchip dsPIC30F2023-based controller to verify the effectiveness of proposed simulation environment and control methodologies.

並列關鍵字

resonant converter ； zero voltage switching ； zero current switching ； synchronous rectifier

參考文獻

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