【摘要】：近年來,具有電能變換功能的開關(guān)電源已經(jīng)廣泛應(yīng)用于航空航天、電子通訊以及新能源等領(lǐng)域。作為高頻開關(guān)電源不可或缺的環(huán)節(jié),DC/DC變換器種類眾多且具有重大研究意義。在軟開關(guān)技術(shù)出現(xiàn)之前,DC/DC變換器在工作時會伴有各種開關(guān)損耗,致使其使用時間變短,限制了自身的高頻化發(fā)展。半橋LLC諧振變換器因其工作頻率高、抗干擾性能強而備受青睞,成為人們的研究熱點。半橋LLC諧振變換器常常采用脈寬調(diào)制技術(shù)和脈沖頻率調(diào)制技術(shù)來達到輸出電壓穩(wěn)定的目的。PWM控制方式在輸入電壓范圍較寬時,容易丟失控制信號,進而引發(fā)占空比缺失,變換器的工作效率隨之下降。因此本文將采用控制效果優(yōu)良的PFM控制方式,采用該控制方式的諧振變換器具有電路結(jié)構(gòu)簡單、系統(tǒng)響應(yīng)速度快,工作效率高等優(yōu)點。本文主要工作內(nèi)容如下:⑴分析了和軟開關(guān)技術(shù)結(jié)合的5種DC/DC變換器的工作原理,并對比它們的優(yōu)缺點選用了本文要設(shè)計的半橋LLC諧振變換器;分析該變換器的工作原理,構(gòu)建變換器等效電路,推導(dǎo)輸出電壓和工作頻率的關(guān)系式,確定其工作頻域。⑵給出了半橋LLC諧振變換器的各項設(shè)計指標(biāo),然后對主電路部分進行設(shè)計,包括變壓器、諧振網(wǎng)絡(luò)、主開關(guān)管等等。在設(shè)計諧振網(wǎng)絡(luò)時,選取適當(dāng)?shù)碾姼袣w一化量K值和品質(zhì)因數(shù)Q值,根據(jù)相關(guān)的公式求出各諧振元件的具體參數(shù)。⑶對比分析了幾種常見的控制方式,選擇了控制效果優(yōu)良的PFM控制方式,然后介紹了控制芯片UC3863的特點和引腳功能;之后在對芯片的外圍電路進行一定的分析,對其外接的電容電阻參數(shù)進行計算;最后設(shè)計了功率驅(qū)動電路和光耦反饋電路。⑷采用Saber軟件對所設(shè)計的變換器進行仿真分析,分別對開關(guān)管、諧振網(wǎng)絡(luò)和副邊二極管以及整體電路系統(tǒng)進行了仿真分析。從仿真的結(jié)果可知本次設(shè)計的變換器實現(xiàn)了軟開關(guān)功能,且其輸出電壓紋波小,驗證了理論分析的正確性。
[Abstract]:In recent years, switching power supply with power conversion function has been widely used in aerospace, electronic communication and new energy fields. As an indispensable link of high frequency switching power supply, DC / DC converter is of great significance. Before the emergence of soft switching technology, DC / DC converters will be accompanied by various switching losses in operation, resulting in shorter service time, which limits the development of their own high frequency. Half-bridge LLC resonant converter is very popular because of its high frequency and strong anti-jamming performance. Half bridge LLC resonant converter often uses pulse width modulation technology and pulse frequency modulation technology to achieve the purpose of output voltage stability. When the input voltage range is wide, the control signal is easily lost, and then the duty cycle is missing. The efficiency of the converter decreases accordingly. Therefore, the PFM control mode with good control effect will be adopted in this paper. The resonant converter with this control mode has the advantages of simple circuit structure, fast system response speed and high working efficiency. The main work of this paper is as follows: 1 analyzes the working principles of five kinds of DC/DC converters combined with soft switching technology, and compares their advantages and disadvantages with the half-bridge LLC resonant converter designed in this paper, and analyzes the working principle of the converter. The equivalent circuit of the converter is constructed, the relation between the output voltage and the working frequency is deduced, and the design indexes of the half-bridge LLC resonant converter are given in the working frequency domain .2. Then the main circuit is designed, including the transformer. Resonant networks, main switches, etc. In the design of resonant network, appropriate inductance normalized value K value and quality factor Q value are selected. According to the relevant formula, the specific parameters of each resonant element are calculated, and several common control methods are compared and analyzed. The PFM control mode with good control effect is selected, then the characteristics and pin functions of the control chip UC3863 are introduced, and then the peripheral circuit of the chip is analyzed, and the external capacitance resistance parameters are calculated. Finally, the power drive circuit and optocoupler feedback circuit .4 are designed to simulate and analyze the converter with Saber software, and the switching tube, resonant network, auxiliary diode and the whole circuit system are simulated and analyzed respectively. The simulation results show that the designed converter realizes the soft-switching function, and its output voltage ripple is small, which verifies the correctness of the theoretical analysis.
【學(xué)位授予單位】：北方民族大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2017
【分類號】：TM46

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本文編號：2198548