单节锂电池保护芯片的设计
发布时间：2018-07-23 14:22
【摘要】：随着微电子技术的发展,移动电话、平板电脑、数码相机等小型电子产品的数量逐渐增加,这就对锂离子电池的发展提出了更高的要求。锂电池由于其诸多优点而得到广泛应用。锂离子电池与其他电池相比,具有高能量密度、高额定电压、使用寿命长、安全性能好、充电速度快、温度适应性强、绿色环保等优点。但是,由于温度问题使锂离子电池的容量容易衰退。且锂离子电池无法耐受过热、过充以及过放,错误使用锂离子电池甚至会导致爆炸。这些缺陷使得锂电池的保护显得更为重要。本论文设计了一款高集成度、低功耗、高精度的锂离子电池保护芯片。该芯片实现了芯片上集成MOSFET,等效阻抗为54m?RDS(ON)。只需要接一个外围电容即可工作,应用非常简便。集成度比一般锂电池保护芯片高。同时,采用电阻网络修调通过提高带隙基准电压的精度,来提高了整个芯片的精度。电压精度范围是-10mV~+10mV。为降低电流损耗,芯片设计了两种休眠状态,休眠状态1和休眠状态2。休眠状态1是系统电压低于过放检测电压时,将关闭相关的电流比较器以减小芯片功耗。休眠状态2是系统温度高于120℃时,将关闭大部分模拟模块以减小芯片功耗同时使芯片适当降温。正常工作情况下,典型电流值为2.04uA。休眠模式下,最大电流值为0.1uA。与一般锂电池保护芯片相比,这款芯片有过温保护的功能,且过温保护模块采用外部迟滞,可以根据过温保护模块输出的不同,选择不同的参考电压。这样不仅精确性得到了提高,而且降低了比较器的设计难度。该芯片同时具有锂电池保护芯片的基本保护功能(过充电压保护、过放电压保护、过充电流保护以及过放电流保护),而且工作电流损耗十分低。它适用于所有需要锂离子电池的电子产品。本芯片的制造工艺采用CSMC公司的0.25um的BCD工艺。电路设计采用Cadence公司的Spectre软件进行仿真。版图设计采用calibre进行DRC、ERC、LVS验证。所有仿真都是在VDD=3.5V下完成。系统整体仿真功能与预期设计一致。
[Abstract]:With the development of microelectronic technology, the number of small electronic products such as mobile phones, tablets, digital cameras and other small electronic products is increasing, which puts forward higher requirements for the development of lithium ion batteries. Lithium battery is widely used because of its many advantages. Compared with other batteries, lithium-ion batteries have the advantages of high energy density, high rated voltage, long service life, good safety performance, fast charging speed, strong temperature adaptability, green environmental protection and so on. However, due to temperature problems, lithium ion battery capacity is prone to decline. And lithium ion batteries can not withstand overheating, overcharge and overdischarge, the wrong use of lithium ion batteries can even lead to explosion. These defects make the protection of lithium batteries even more important. In this paper, a high-integrated, low-power, high-precision lithium ion battery protection chip is designed. The chip realizes integrated MOSFETs on chip with equivalent impedance of 54m?RDS (ON). Only need a peripheral capacitor to work, the application is very simple. The integration level is higher than the ordinary lithium battery protection chip. At the same time, the resistive network is used to improve the accuracy of the whole chip by improving the precision of the bandgap reference voltage. The voltage precision range is -10mV ~ 10mV. In order to reduce the current loss, the chip designed two kinds of dormant state, sleep state 1 and dormant state 2. When the system voltage is lower than the overplay detection voltage, the related current comparator is turned off to reduce the chip power consumption. When the system temperature is higher than 120 鈩，
本文编号：2139685
[Abstract]:With the development of microelectronic technology, the number of small electronic products such as mobile phones, tablets, digital cameras and other small electronic products is increasing, which puts forward higher requirements for the development of lithium ion batteries. Lithium battery is widely used because of its many advantages. Compared with other batteries, lithium-ion batteries have the advantages of high energy density, high rated voltage, long service life, good safety performance, fast charging speed, strong temperature adaptability, green environmental protection and so on. However, due to temperature problems, lithium ion battery capacity is prone to decline. And lithium ion batteries can not withstand overheating, overcharge and overdischarge, the wrong use of lithium ion batteries can even lead to explosion. These defects make the protection of lithium batteries even more important. In this paper, a high-integrated, low-power, high-precision lithium ion battery protection chip is designed. The chip realizes integrated MOSFETs on chip with equivalent impedance of 54m?RDS (ON). Only need a peripheral capacitor to work, the application is very simple. The integration level is higher than the ordinary lithium battery protection chip. At the same time, the resistive network is used to improve the accuracy of the whole chip by improving the precision of the bandgap reference voltage. The voltage precision range is -10mV ~ 10mV. In order to reduce the current loss, the chip designed two kinds of dormant state, sleep state 1 and dormant state 2. When the system voltage is lower than the overplay detection voltage, the related current comparator is turned off to reduce the chip power consumption. When the system temperature is higher than 120 鈩，
本文编号：2139685
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