LLC諧振轉換器輕載效率的改善

本文研製一數位化LLC諧振轉換器，利用改變開關頻率來實現穩定輸出電壓在12V的要求，藉由諧振電感、諧振電容產生諧振，讓一次側開關達成零電壓切換，降低開關切換損失，二次側使用同步整流來降低導通損失，有效提升LLC諧振轉換器的整體效率，操作在輕載情況時，則使用突衝模式來改善效率不佳的問題。本文使用德州儀器公司的數位信號處理器TMS320F28035為控制核心，驗證LLC諧振轉換器在設計與控制正確性。本文所研製的轉換器規格為輸入直流電壓400V，輸出電壓12V，轉換器總額定功率300W，由模擬及實驗結果驗證，在2%負載使用突衝模式下，可以提升效率18%的效率。由以上結果驗證設計與實驗的正確性。

關鍵字

LLC諧振轉換器；零電壓切換；突衝模式

並列摘要

The objective of this thesis is to design and implement an LLC resonant converter controlled by digital signal processor to give 12V output voltage. Variable switching frequency control is used to regulate the output voltage. The resonant inductor, resonant capacitor cooperate to achieve zero voltage switching and reduce switching losses. In addition, a synchronous rectification technique for LLC resonant converter is used to reduce conduction losses in secondary side and burst mode control is used to reduce the switching loss under light load. The Texas Instruments digital signal processor (DSP), TMS320F28035, is used as the control core for the verification of design and implementation. The design specifications include input voltage of 400V, output voltage of 12V and total power rating of 300W. Simulation and experimental results show that the maximum efficiency is 94.66% and the efficiency can be increased up to 18% under 2% load by burst mode control. These results confirm the design and implementation.

並列關鍵字

LLC Resonant Converter ； ZVS ； Burst Mode Control

參考文獻

[8] 陳宜宏，「實現數位控制之LLC諧振轉換器」，國立台北科技大學電機工程系碩士學位論文，民國九十九年七月。

[16] 黃偉銓，「具前級功因調整器之半橋LLC諧振式電源轉換器研製」，大同大學電機工程系碩士學位論文，民國九十八年一月。

[25] 陳雅君，「LLC諧振轉換器之設計與研製」，國立成功大學電機工程系碩士學位論文，民國九十八年六月。

[15] 游閔翔，「具有均流控制之全數位諧振轉換器並聯系統的研製」，國立台北科技大學電機工程系碩士學位論文，民國一百零二年七月。

[3] E. X. Yang, Fred C. Lee and M. M. Wu, “Small-signal modeling of series and parallel resonant converter,” in Proc. of the IEEE Applied Power Electronics Conference and Exposition (APEC), pp. 785-792, 1992.

國際替代計量

LLC諧振轉換器輕載效率的改善

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