高精度多模式鋰電池智能充電管理芯片的設計
[Abstract]:With the development of IC technology, the variety and quantity of handheld devices are increasing day by day. As the core of handheld devices, the expectation of battery is becoming higher and higher. Because of its high specific energy, no pollution, large capacity and long cycle life, lithium battery is regarded as the ideal energy for development in the 21st century and has become the mainstream of energy storage equipment in the market today. But lithium batteries also have concerns about safety: overcharging and high temperatures can cause them to explode; overdischarge can reduce their life and even damage them. It is very necessary to take some protective measures for lithium battery during charging and discharging, so it is very important to study the battery charge management chip with high reliability, high precision and safety. According to the working principle of Buck switch converter, a high-precision and multi-mode intelligent charge management chip for lithium battery is designed and analyzed by using CSMC 0.5um BCD technology. The lithium battery charge management chip designed in this paper adopts three charging modes: precharge trickle mode, constant current mode and constant voltage mode. Since trickle mode charging makes the system work in discontinuous on-mode (DCM), and constant-current mode charging in continuous on-mode (CCM), this design adopts peak current-mode pulse hybrid modulation (PFM-PWM) control mode. In order to improve the transient response to the change of power supply voltage and load and the conversion efficiency of the system. In order to adapt to the wide input voltage range, the slope compensation technology is introduced to increase the load capacity of the system. The maximum programmable charging current of this chip is up to 2A and the safe charging time can be set externally. At the same time, the terminal voltage precision of battery charging is up to 鹵0.75 and can be set externally to charge two lithium batteries in one section or in series. According to the safety specification issued by Japan Battery Association, the NTC battery temperature real-time monitoring and adjusting charging current and charging termination voltage charging mode are integrated. In addition, the chip integrates the protection circuits such as periodic current limiting protection circuit, chip over-temperature protection circuit, battery overcharge protection circuit and bad battery detection circuit, which improves the charging rate and ensures the security of lithium battery charging. This paper first introduces the development of lithium battery, the charging principle and charging method of lithium battery, and the charging management chip which is widely used in the market now, and then describes the principle and characteristics of Buck switch converter. The advantages and disadvantages of current control mode and voltage control mode are compared, and the stability of the system is analyzed according to the basic topology of Buck switching converter. Finally, the whole circuit is designed on this basis. This paper focuses on the analysis of bandgap reference circuit, oscillator and slope compensation circuit, NTC battery charging protection circuit, constant current / constant voltage operational amplifier and charging mode switching circuit. The whole circuit is designed on the premise of reducing the peripheral devices as much as possible. Finally, the circuit designed in this paper is simulated under the spectre simulation environment of cadence platform. The voltage source is used to simulate the battery charging under different input voltage, different process parameters and different working environment temperature. The simulation results all meet the requirements of the design index, and have been sent out of the flow sheet.
【學位授予單位】:西安電子科技大學
【學位級別】:碩士
【學位授予年份】:2014
【分類號】:TM912
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