本文關(guān)鍵詞：一種高效率寬輸出電壓范圍的降壓型DC-DC轉(zhuǎn)換器設(shè)計(jì)　出處：《西安電子科技大學(xué)》2015年碩士論文　論文類型：學(xué)位論文

  更多相關(guān)文章： 降壓型DC-DC 峰值電流模 Hiccup工作模式 高效率 寬輸出電壓范圍 BCD工藝

【摘要】：隨著IC技術(shù)產(chǎn)業(yè)的快速發(fā)展,便攜式電子產(chǎn)品日益普及,智能設(shè)備也正在蓬勃發(fā)展,如筆記本電腦、智能手機(jī)、智能電視、車載導(dǎo)航、行車記錄儀等,也將在未來成為主流,這些都將成為工作生活中越來越重要的工具。結(jié)合其自身產(chǎn)品各自的特點(diǎn),如筆記本電腦的便攜性,智能手機(jī)的電池穩(wěn)定和持久耐用性等等,使得其對電池壽命的要求越來越高。因此,對開關(guān)電源的需求更大且性能要求更高,如效率要求更高,功耗更低,驅(qū)動能力和耐壓能力更強(qiáng)等。因此本文設(shè)計(jì)一個(gè)高效率寬輸入范圍Buck型DC-DC轉(zhuǎn)換器[2]。首先分析了基本的Buck型DC-DC的基本原理,反饋控制模式的特點(diǎn),隨后對開關(guān)電源設(shè)計(jì)中的關(guān)鍵技術(shù)進(jìn)行了闡述,如減小功耗的同步整流技術(shù)、保證環(huán)路穩(wěn)定性的環(huán)路補(bǔ)償技術(shù)、提高效率的工作模式切換技術(shù)等等。最終根據(jù)應(yīng)用需求確定了本設(shè)計(jì)中的DC-DC轉(zhuǎn)換器將采用峰值電流�？刂品绞讲㈦S后對整個(gè)芯片系統(tǒng)中各個(gè)功能模塊進(jìn)行了原理性分析和設(shè)計(jì),如電壓環(huán)路中的誤差放大器、PWM比較器;電流環(huán)路的電流放大器和斜坡補(bǔ)償電路;振蕩器、帶隙基準(zhǔn)等。同時(shí)對各個(gè)功能模塊進(jìn)行了詳細(xì)的原理性分析。最后基于0.35μm BCD-MOS工藝[4],使用Spectre仿真工具對整個(gè)Buck型DC-DC轉(zhuǎn)換器進(jìn)行了模塊仿真和系統(tǒng)級仿真驗(yàn)證。仿真結(jié)果表明,本論文中設(shè)計(jì)的開關(guān)電源的輸入電壓為4.5V~16V,輸出電壓為1.8V~(Vin-3)V,最大負(fù)載電流為3A,典型負(fù)載電流1A,振蕩器頻率為1MHz。實(shí)現(xiàn)了大的輸出電壓范圍,同時(shí)在效率上最大可達(dá)到94%。Buck型DC-DC轉(zhuǎn)換器在輕載情況下會工作在DCM模式,提高效率;芯片會在重載情況下切換到打嗝(Hiccup)工作模式,防止大電流損壞整個(gè)芯片系統(tǒng)的同時(shí)提高效率。為了進(jìn)一步提高效率,整個(gè)系統(tǒng)中通過增加死區(qū)時(shí)間控制電路來減小導(dǎo)通損耗,零電流比較器來防止電流倒灌引起的損耗。整個(gè)芯片最后加了過溫保護(hù)、過流保護(hù)和欠壓鎖定等保護(hù)模塊來保證芯片正常安全工作。
[Abstract]:With the rapid development of IC technology industry, portable electronic products are becoming more and more popular, and smart devices are booming, such as notebook computer, smart phone, smart TV, vehicle navigation, CarLog and so on. They will also become mainstream in the future, which will become increasingly important tools in working life, combining the characteristics of their own products, such as the portability of laptops. The battery stability and durability of smart phone make the demand for battery life more and more high. Therefore, the demand for switching power supply is greater and higher performance requirements, such as higher efficiency requirements, lower power consumption. Therefore, a high efficiency and wide input range Buck type DC-DC converter is designed in this paper. [2]. Firstly, the basic principle of Buck type DC-DC and the characteristics of feedback control mode are analyzed, and then the key technologies in the design of switching power supply are described. Such as reducing power consumption of synchronous rectifier technology, loop compensation technology to ensure the stability of the loop. Finally, according to the application requirements, the DC-DC converter in this design will adopt peak current mode control mode, and then the whole chip system each function module into. Principle analysis and design are carried out. Such as voltage loop in the error amplifier PWM comparator; Current amplifier and ramp compensation circuit of current loop; Oscillator, bandgap reference, etc. At the same time, the principle of each functional module is analyzed in detail. Finally, based on 0. 35 渭 m BCD-MOS process. [4. The module simulation and system-level simulation of the whole Buck type DC-DC converter are carried out by using the Spectre simulation tool. The simulation results show that. The input voltage, output voltage and maximum load current of the switching power supply are 4.5V, 16V, 1.8 V and 3A, respectively, and the typical load current is 1A. The oscillator frequency is 1MHz. The output voltage range is large, and the maximum efficiency of 94. Buck DC-DC converter will work in DCM mode under light load. Improving efficiency; The chip will switch to hiccup cupboard working mode under heavy load to prevent high current damage to the entire chip system while improving efficiency in order to further improve efficiency. In the whole system, the on-loss is reduced by adding dead-time control circuit, and the zero-current comparator is used to prevent the loss caused by current inversion. Finally, the whole chip is protected by over-temperature. Protection modules such as overcurrent protection and undervoltage locking are used to ensure the safe operation of the chip.
【學(xué)位授予單位】：西安電子科技大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2015
【分類號】：TM46

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1 羅勇;一種高效率寬輸出電壓范圍的降壓型DC-DC轉(zhuǎn)換器設(shè)計(jì)[D];西安電子科技大學(xué);2015年

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本文編號：1372663