【摘要】：隨著電力電子技術(shù)的進(jìn)步發(fā)展，開關(guān)電源以其高頻、高效、高功率密度、體積小等優(yōu)點(diǎn)，逐漸取代線性電源，成為主流。軟開關(guān)技術(shù)可以使開關(guān)電源的電磁干擾問題得到改善，且可提高系統(tǒng)效率，成為近年來電力電子技術(shù)的研究熱點(diǎn)。在各類軟開關(guān)電源電路中，移相全橋ZVS變換器兩個(gè)橋臂均工作在零電壓開通軟開關(guān)條件下，，開關(guān)損耗小，結(jié)構(gòu)簡(jiǎn)單，易于控制，且不增加開關(guān)管應(yīng)力，因此廣泛應(yīng)用于中、大功率電路。本文對(duì)基于移相全橋ZVS變換器及DSP數(shù)字控制的電動(dòng)汽車地面充電機(jī)進(jìn)行了理論分析與詳細(xì)設(shè)計(jì)。 文章首先通過比較目前電動(dòng)汽車直流充電電源常用的充電方法及DC-DC拓?fù)浣Y(jié)構(gòu)，選取移相全橋電路作為主電路結(jié)構(gòu)以及兩段式智能充電方法，并給出了充電電源系統(tǒng)結(jié)構(gòu)。 其次介紹了本文所采用的功率電路拓?fù)浣Y(jié)構(gòu)即移相全橋ZVS變換器工作原理，研究了該類變換器所存在的諸如副邊占空比丟失、副邊整流電壓振蕩等缺點(diǎn)，給出了解決方法，并以此為基礎(chǔ)對(duì)主要元件進(jìn)行了參數(shù)設(shè)計(jì) 然后基于Buck變換器小信號(hào)模型，對(duì)移相全橋ZVS變換器進(jìn)行建模，得出控制系統(tǒng)的開環(huán)函數(shù)，并通過仿真觀察其波特圖。設(shè)計(jì)了以DSP芯片TMS320F28335為基礎(chǔ)的控制電路，包括檢測(cè)電路、開關(guān)管驅(qū)動(dòng)電路、輔助電源、保護(hù)電路等，并對(duì)相關(guān)參數(shù)進(jìn)行了計(jì)算。 最后以Matlab/Simulink軟件對(duì)設(shè)計(jì)的系統(tǒng)電路進(jìn)行了仿真，并在20kW樣機(jī)上進(jìn)行了相關(guān)實(shí)驗(yàn)。實(shí)驗(yàn)結(jié)果表明：充電系統(tǒng)參數(shù)設(shè)計(jì)合理，移相全橋變換器成功實(shí)現(xiàn)ZVS，滿足系統(tǒng)性能要求。數(shù)字控制軟件工作正常，檢測(cè)保護(hù)電路能及時(shí)準(zhǔn)確對(duì)故障信號(hào)進(jìn)行檢測(cè)保護(hù)，輸出電壓穩(wěn)定。驗(yàn)證了系統(tǒng)設(shè)計(jì)的準(zhǔn)確可靠性。
[Abstract]:With the development of power electronics technology, switching power supply has become the mainstream because of its advantages such as high frequency, high efficiency, high power density, small volume and so on. Soft-switching technology can improve the electromagnetic interference problem of switching power supply and improve the system efficiency, which has become a hot research topic of power electronics technology in recent years. In all kinds of soft switching power supply circuits, the two bridge arms of phase-shifted full-bridge ZVS converter operate under the condition of zero-voltage on soft-switching, the switching loss is small, the structure is simple, the structure is easy to control, and the stress of switch is not increased, so it is widely used in the field. High power circuit. In this paper, the ground charger of electric vehicle based on phase-shifted full-bridge ZVS converter and DSP digital control is analyzed and designed in detail. Firstly, by comparing the common charging methods and DC-DC topology of DC charging power supply for electric vehicles, the phase-shifting full bridge circuit is selected as the main circuit structure and the two-stage intelligent charging method, and the charging power supply system structure is given. Secondly, the principle of phase-shifted full-bridge ZVS converter, which is the topology of power circuit adopted in this paper, is introduced. The disadvantages of this kind of converter, such as the loss of duty cycle of the secondary side and the voltage oscillation of the secondary side rectifier, are studied, and the solutions are given. Then based on the small-signal model of the Buck converter, the phase-shifted full-bridge ZVS converter is modeled, and the open-loop function of the control system is obtained, and the baud diagram of the control system is observed by simulation. The control circuit based on DSP chip TMS320F28335 is designed, including detection circuit, switch driving circuit, auxiliary power supply, protection circuit, etc., and the related parameters are calculated. Finally, the system circuit is simulated with Matlab/Simulink software, and the related experiments are carried out on the 20kW prototype. The experimental results show that the charging system parameters are reasonably designed and the phase-shifted full-bridge converter (ZVS,) is successfully implemented to meet the system performance requirements. The digital control software works normally, the detection and protection circuit can detect and protect the fault signal in time and accurately, and the output voltage is stable. The accuracy and reliability of the system design are verified.
【學(xué)位授予單位】：武漢理工大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2014
【分類號(hào)】：TM46;U469.72

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