本文選題：鋰離子電池 + 開(kāi)關(guān)模式��； 參考：《電子科技大學(xué)》2014年碩士論文

【摘要】：近十幾年來(lái),電子技術(shù)快速發(fā)展,特別是消費(fèi)電子出現(xiàn)巨大的市場(chǎng)空間,便攜式電子產(chǎn)品成為未來(lái)的發(fā)展趨勢(shì)。各種便攜式電子產(chǎn)品功能日益增多,速度越來(lái)越快,體積卻逐漸縮小,這對(duì)其供電電池提出了長(zhǎng)續(xù)航時(shí)間、輕便、高效的要求。鋰離子電池具有高能量密度、長(zhǎng)壽命、高放電電壓、無(wú)污染、無(wú)記憶效應(yīng)等獨(dú)特優(yōu)勢(shì),因而成為了便攜式電子產(chǎn)品的理想供電電池。但鋰離子電池對(duì)充電過(guò)程的控制要求更為嚴(yán)苛,需要高精度的電流、電壓充電,分段的充電過(guò)程和完善的保護(hù)功能。本文針對(duì)高精度、分階段等充電需求,設(shè)計(jì)了一款基于0.5μm標(biāo)準(zhǔn)CMOS工藝的開(kāi)關(guān)模式充電控制芯片。本文首先介紹了鋰離子電池的特性及充電控制方式,具體闡述了恒壓充電、恒流充電、恒流恒壓(Constant Current Constant Voltage,CC-CV)充電三種充電控制方式,分析了CC-CV充電方式的優(yōu)勢(shì)。然后介紹鋰離子電池充電系統(tǒng)設(shè)計(jì),包括充電拓?fù)洹h(huán)路控制模式選擇,接著計(jì)算了電感、電容等系統(tǒng)參數(shù)。最后,闡述了芯片內(nèi)部關(guān)鍵功能模塊的設(shè)計(jì)與仿真,包括帶隙基準(zhǔn)電路、軟啟動(dòng)電路、芯片欠壓保護(hù)電路、過(guò)熱關(guān)斷保護(hù)及RC振蕩器等功能模塊,并仿真驗(yàn)證了整體電路功能。本文重點(diǎn)介紹了高精度的電流型帶隙基準(zhǔn)電路設(shè)計(jì)和軟啟動(dòng)、功率管驅(qū)動(dòng)的實(shí)現(xiàn)。本文設(shè)計(jì)的充電控制芯片整體版圖面積大小為3mm×2mm,采用0.5μm標(biāo)準(zhǔn)CMOS工藝流片,具有低成本優(yōu)勢(shì)。其中,1.25V的帶隙基準(zhǔn)電壓源溫度系數(shù)為13ppm/℃,設(shè)計(jì)有Trimming修調(diào)電路校正工藝角偏差,在-40~120℃的工作溫度范圍內(nèi)確保電池充電結(jié)束電壓精度在0.5%以內(nèi)。開(kāi)關(guān)頻率為1.5MHz,采用功率管驅(qū)動(dòng)電路實(shí)現(xiàn)高效率的開(kāi)關(guān)模式充電控制,具有軟啟動(dòng)電路、欠壓保護(hù)、過(guò)熱關(guān)斷等多方面保護(hù)功能。
[Abstract]:In recent years, the rapid development of electronic technology, especially the emergence of huge market space for consumer electronics, portable electronic products become the trend of development in the future. All kinds of portable electronic products have more and more functions, faster speed and smaller volume, which puts forward the requirement of long battery life, portability and high efficiency. Li-ion batteries have many unique advantages, such as high energy density, long life, high discharge voltage, no pollution, no memory effect and so on, so they have become the ideal power supply battery for portable electronic products. However, the control of the charging process is more stringent, requiring high precision current, voltage charging, piecewise charging process and perfect protection function. In this paper, a switch mode charging control chip based on 0.5 渭 m standard CMOS process is designed to meet the demand of high precision and stage charging. In this paper, the characteristics and charging control methods of lithium ion battery are introduced, and the three charging control modes, constant current constant voltage charge and constant current constant voltage charge CC-CV, are described in detail. The advantages of CC-CV charging mode are analyzed. Then the design of lithium ion battery charging system is introduced, including charging topology, loop control mode selection, and system parameters such as inductance and capacitance are calculated. Finally, the design and simulation of the key functional modules in the chip are described, including bandgap reference circuit, soft start circuit, under-voltage protection circuit, overheat turn-off protection and RC oscillator. The whole circuit function is verified by simulation. This paper focuses on the design of high precision current-mode bandgap reference circuit and the realization of soft start and power transistor drive. The overall layout area of the charge control chip designed in this paper is 3mm 脳 2mm, and the chip is based on 0.5 渭 m standard CMOS technology, which has the advantage of low cost. The temperature coefficient of 1.25V bandgap voltage reference source is 13ppm/ 鈩，

本文編號(hào)：2084088