本文選題：電流�？刂� + 斜坡補(bǔ)償��； 參考：《電子科技大學(xué)》2016年碩士論文

【摘要】：功能日益強(qiáng)大的電子系統(tǒng)大多采用負(fù)載點(diǎn)電源供電,對該類電源的要求是高可靠性、高效率和高功率密度,甚至一些電池供電的設(shè)備要求負(fù)載點(diǎn)電源能夠在很低輸入電壓的情況下正常工作。這些高要求無疑給電壓轉(zhuǎn)換器的設(shè)計(jì)帶來新的挑戰(zhàn)。電流模的開關(guān)電源芯片因其補(bǔ)償環(huán)路簡單、動態(tài)性能好等優(yōu)點(diǎn),被廣泛用來做負(fù)載點(diǎn)電源。然而,電流模式控制容易受一些因素的影響,比如不合適的斜坡補(bǔ)償會導(dǎo)致次諧波振蕩或者環(huán)路響應(yīng)變差等。本文旨在設(shè)計(jì)一款高性能降壓型電流模單片開關(guān)電源芯片,輸入電壓4V-7V,輸出電壓0.8V-6.3V,最大負(fù)載電流6A。其主要特點(diǎn)是開關(guān)頻率可以根據(jù)實(shí)際應(yīng)用進(jìn)行調(diào)節(jié)或者外同步,而頻率的改變會對斜坡補(bǔ)償和環(huán)路穩(wěn)定性等控制環(huán)路方面產(chǎn)生影響,本文重點(diǎn)圍繞這個問題展開分析和研究。在對傳統(tǒng)的線性分段斜坡補(bǔ)償和二次斜坡補(bǔ)償電路分析的基礎(chǔ)上,提出一種新穎的自適應(yīng)二次斜坡補(bǔ)償電路,其補(bǔ)償斜率不僅可以隨著輸入輸出電壓而變化還能根據(jù)開關(guān)頻率和電感值的大小而自適應(yīng)的改變,使得電流控制環(huán)在不同的應(yīng)用條件下都有很好的瞬態(tài)響應(yīng);另外,為了滿足在全負(fù)載范圍的條件下,開關(guān)變換器都有高的效率,采用了一種最小占空比電路以使變換器在由重載到輕載轉(zhuǎn)變時,調(diào)制模式自動從PWM切換到PSM模式,實(shí)現(xiàn)雙模式調(diào)節(jié);最后,對補(bǔ)償部分的跨導(dǎo)放大器進(jìn)行了改進(jìn)設(shè)計(jì),使得整體系統(tǒng)的瞬態(tài)響應(yīng)得到很大的改善。最后,本論文中的設(shè)計(jì)是基于0.35μm的BCD工藝進(jìn)行的,所有的仿真結(jié)果都已滿足指標(biāo)。目前整體版圖已經(jīng)拼好,且通過DRC規(guī)則和LVS驗(yàn)證。
[Abstract]:The electronic system becomes more and more powerful function mostly uses the point of load power supply, the power supply requirements are high reliability, high efficiency and high power density, and even some battery powered equipment requirements point of load power supply can work normally in a very low input voltage conditions. These high requirements to voltage converter design will undoubtedly bring new challenges the current mode switching power supply chip. Because of its advantages of simple loop compensation, good dynamic performance, is widely used for point of load power. However, current mode control is easily affected by some factors, such as inappropriate slope compensation will cause harmonic oscillation or loop response variation. The purpose of this paper is to design a monolithic current mode high performance buck type switching power supply chip, the input voltage 4V-7V, output voltage 0.8V-6.3V, maximum load current of 6A. and its main feature is the switching frequency can be according to the actual stress With the adjusted or external synchronization, and frequency change will affect the stability of slope compensation and loop control loop, this paper focus on the analysis and Research on this issue. In the traditional linear piecewise slope compensation and analysis of the two slope compensation circuit based on a novel adaptive slope two the compensation circuit, the compensation slope can not only with the input voltage and the output voltage can vary according to the size and the change of adaptive switching frequency and inductance value, the current control loop in different application conditions have good transient response; in addition, in order to meet the full range of load conditions, switching converter has high the efficiency of using a minimum duty ratio circuit to make the converter by heavy load to light load change, automatic modulation mode switching from PWM to PSM mode, realize the dual mode adjustment; the After the compensation part of the transconductance amplifier was designed to improve the transient response of the whole system, which greatly improved. Finally, the design in this paper is the BCD technology based on M 0.35, all the simulation results meet the target. At present, the overall layout has good fight, and through the DRC and LVS rules verify.

【學(xué)位授予單位】：電子科技大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2016
【分類號】：TM46

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本文編號：1740558