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研究生:潘茂松
研究生(外文):Mao Song Pan
論文名稱:半橋諧振轉換器之輕載效率改善
論文名稱(外文):Efficiency Improvement of Half Bridge Resonant Converter under Light Load Condition
指導教授:賴炎生
指導教授(外文):Yen Shin Lai
口試委員:何恭旻黃明熙
口試委員(外文):Yen Shin LaiYen Shin Lai
口試日期:2016-07-16
學位類別:碩士
校院名稱:國立臺北科技大學
系所名稱:電力電子產業研發碩士專班
學門:工程學門
學類:電資工程學類
論文種類:學術論文
論文出版年:2016
畢業學年度:104
語文別:中文
中文關鍵詞:半橋諧振轉換器、零電壓切換偵測、混合式控制
外文關鍵詞:Half-Bridge Resonant converter、zero voltage switching detection、hybrid control
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本論文主要研製一數位控制半橋諧振轉換器,藉由開關訊號控制其輸出電壓,且由電路諧振元件:諧振電感、諧振電容及激磁電感,使開關於切換瞬間達到零電壓切換以降低開關切換損失;變壓器二次側加入同步整流以減少二次側大電流之導通損失。此外,硬體的設計可加大激磁電感感量,進而降低一次側電流與損失,提升整體效率,但過大的激磁電感,於輕載時,有輸出電壓調整以及開關無法能達到零電壓切換等問題。本文提出之轉換器於輕載時,改變原變頻控制法則,使用PWM控制法與輔助電路偵測判斷是否達到零電壓切換。本論文所提PWM控制法為降低頻率與調變開關脈波寬度,以雙自由度達到零電壓切換,有別於其他方法利用增加Dead-time達到零電壓切換。
本文採用TI數位信號處理器TMS320F28035為控制平台,驗證數位式諧振轉換器在實作、理論及設計上的正確性;本文所研製之轉換器規格為直流輸入電壓400V,直流輸出電壓12V,額定功率360W,開關切換頻率為77kHz~140kHz且最高效率可達94%以上。
The main theme of this thesis is to design and implement an half-bridge resonant converter controlled by digital signal processor. The output voltage is controlled by the output signal of DSP. The resonant inductor, resonant capacitor and magnetizing inductor are used to achieve zero voltage switching and reduce switching loss. In addition, synchronous rectifier control of LLC converter is used to reduce conduction loss in secondary side.
Besides, the circuit parameter is designed with the large magnetizing inductance to reduce primary side current. However, the output voltage regulation and zero voltage switching may not be achieved under light load condition. A hybrid control strategy is proposed using the pulse width modulation and auxiliary detection circuit to determine the zero voltage switching and regulate output voltage under light load condition. The proposed PWM control method have two degrees of freedom to achieve ZVS by varying the pulse width and lowing the switching frequency rather than changing the deadtime as shown by conventional method.
The signal processor, TMS320F28035, is used as the control platform for the verification of design and implementation. The design specifications include: input voltage 400V, output voltage 12V, total power rating 360W, switching frequency from 77kHz~140kHz, and the maximum efficiency can go up to 94%.
摘要 ii
ABSTRACT iii
誌謝 v
目 錄 vi
表目錄 viii
圖目錄 ix
第一章 緒論 1
1.1 研究背景 1
1.2 本文目的與大綱 4
1.3 文獻探討與回顧 5
1.4 研究大綱 10
第二章 半橋LLC諧振轉換器原理分析 11
2.1 半橋LLC諧振轉換器簡介 11
2.2 半橋LLC諧振轉換器操作原理 13
2.3 LLC 諧振轉換器直流特性分析 23
2.3.1 Q值大小對轉移函數的影響 26
2.3.2 K值大小對轉移函數的影響 27
第三章 基於加大激磁電感之電路參數設計 28
3.1 加大激磁電感值探討 28
3.2 半橋LLC轉換器規格與參數設計 30
第四章 零電壓切換偵測電路 35
4.1 混合型切換控制模式原理說明 37
4.1.1 FM 模式 37
4.1.2 PWM 模式 38
4.2 零電壓切換偵測輔助電路設計 43
4.2.1 零電壓切換偵測方式 43
4.2.2 零電壓切換偵測模擬 43
4.2.3 零電壓切換偵測實際測量與分析 45
4.2.4 零電壓切換之變壓器電壓振盪與分析 46
4.2.2 偵測電路設計 47
4.3 控制器設計 51
第五章 實驗結果 54
5.1 零電壓切換測試 55
5.2 FM / PWM模式切換驗證 61
5.3 加載測試 62
5.4 效率測試結果 68
5.5 輸出電壓漣波測試 70
第六章 結論與未來展望 72
6.1 結論 72
6.2 未來展望 72
參考文獻 73
符號彙編 76
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[6] B. Yang, “Topology investigation for front end DC/DC power conversion for distributed power,” Ph.D. Dissertation, Virginia Tech, 2003.
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[21] “Design guide for LLC converter with ICE2HS01G”, Infineon Technologies, July 2011.
[22] IPA65R190CFD, Datasheet, infineon Technonogies, Nov 2013.
[23] TMS320F28035, Datasheet, Texas Instruments Incorporated, May 2009.
[24] TLV3502-Q1, Datasheet, Texas Instruments Incorporated, Feb., 2014.
[25] 1N4148, Datasheet, NXP, Aug. 2004.
[26] Conductive Polymer Aluminum Solid Electrolytic Capacitors LG series, Datasheet, Nichicon, 2011.
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[30] C. Fei, F. C. Lee, and Q. Li “Light load efficiency improvement for high frequency LLC converters with simplified optimal trajectory control (SOTC),” IEEE ECCE, 2015.
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[32] Primary Side MOSFET Selection for LLC Topology, infineon Technonogies, June 2014
[33] L6699 Enhanced high voltage resonant controller, Datasheet, STMicroelectronics, Jan. 2013
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