具有快速瞬態(tài)響應(yīng)的電壓模式Buck變換器設(shè)計(jì)
本文關(guān)鍵詞: 參考電壓選擇電路 閾值電壓控制電路 過沖電壓 瞬態(tài)恢復(fù)時(shí)間 軟啟動(dòng)電路 出處:《合肥工業(yè)大學(xué)》2016年碩士論文 論文類型:學(xué)位論文
【摘要】:隨著手機(jī)、筆記本電腦、數(shù)碼相機(jī)等便攜式電子產(chǎn)品的更新?lián)Q代與發(fā)展,對(duì)它們的“心臟”電源管理芯片的要求也越來越高。傳統(tǒng)的線性穩(wěn)壓器由于壓差大時(shí)所表現(xiàn)出的功耗問題已無法滿足高效系統(tǒng)的需求。開關(guān)變換器由于效率高,并且輸出電壓可升降的優(yōu)點(diǎn),正逐步應(yīng)用于低功率領(lǐng)域并取代線性穩(wěn)壓器的市場(chǎng)地位。為了改善負(fù)載快速變換對(duì)電源系統(tǒng)所帶來的影響,本文設(shè)計(jì)了一款具有快速瞬態(tài)響應(yīng)的電壓模式Buck變換器。針對(duì)電壓控制Buck變換器提出了一種參考電壓可選擇的設(shè)計(jì)方案,通過參考電壓選擇電路和閾值電壓控制電路來選擇不同的參考電壓,實(shí)現(xiàn)了Buck變換器的快速瞬態(tài)響應(yīng)。設(shè)計(jì)采用0.18μm CMOS工藝,仿真結(jié)果表明,該變換器能在負(fù)載瞬態(tài)變化的情況下實(shí)現(xiàn)輸出過沖電壓小于100mV,并且瞬態(tài)恢復(fù)時(shí)間小于13μs,與傳統(tǒng)的電壓控制模式相比,具有更好的瞬態(tài)響應(yīng)性能。為了消除電源上電啟動(dòng)階段時(shí)由于誤差放大器工作于非平衡狀態(tài)所帶來的浪涌電流與過沖電壓,本文還設(shè)計(jì)一種新穎的軟啟動(dòng)電路。軟啟動(dòng)電路采用了斜坡發(fā)生器產(chǎn)生的間歇式脈沖VPL作為電容充電的控制信號(hào)。一方面,VPL在低電平時(shí)為軟啟動(dòng)電容充電,在高電平時(shí)則保持軟啟動(dòng)電壓值不變,使軟啟動(dòng)電壓線性階梯上升。另一方面,該軟啟動(dòng)電路還通過兩個(gè)電流源I1及I2相減,獲得一個(gè)較小的軟啟動(dòng)充電電流I1-I2。通過兩者的共同作用,有效延長(zhǎng)了軟啟動(dòng)的時(shí)間。仿真結(jié)果表明,該軟啟動(dòng)電路的啟動(dòng)時(shí)間為324μs。
[Abstract]:With the mobile phone, notebook computer, generation and development of digital cameras and other portable electronic product updates on their "heart" power management chip requirements are also increasing. The traditional linear regulator due to the pressure difference to show when the power system has been unable to meet the high demand. Because of the high efficiency switching converter. The advantages and the output voltage is adjustable, which is gradually applied in low power field and replace the linear regulator's market position. In order to improve the load effect brought by the rapid transformation of the power supply system, this paper designed a voltage mode Buck converter with fast transient response. The voltage controlled Buck converter is put forward a design scheme the reference voltage can be selected, through the choice of reference voltage circuit and threshold voltage control circuit to choose different reference voltages, realizes fast transient Buck converter State response design using 0.18 m CMOS technology, the simulation results show that the converter can achieve the output voltage overshoot is less than 100mV in the transient load changes, and transient recovery time is less than 13 s, compared with the traditional voltage mode control, the transient response has better performance. In order to eliminate the power on start stage due to surge current error amplifier in non-equilibrium state and caused by the voltage overshoot, this paper designs a novel soft start circuit. The control signal soft start circuit adopts an intermittent pulse VPL ramp generator produced as capacitor charging. On the one hand, VPL usually charging soft start capacitor in low electricity, in the high level while maintaining the soft start voltage is constant, the soft start voltage linear stepped up. On the other hand, the soft start circuit through the two current source I1 and I2 subtraction, to obtain a smaller The soft start charging current I1-I2. effectively prolongs the time of soft start through the combination of both. The simulation results show that the start-up time of the soft start circuit is 324 s..
【學(xué)位授予單位】:合肥工業(yè)大學(xué)
【學(xué)位級(jí)別】:碩士
【學(xué)位授予年份】:2016
【分類號(hào)】:TM46
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