【摘要】 胎压监测系统(TPMS)是汽车电子安全的重要组成部分.无电池胎压监测系统可以提高检测频率,提高安全性,是胎压监测系统的发展趋势.采用125kHz作为无线能量传输的频率,采用ASMC 0.35μm BCD汽车电子工艺,针对轮胎转动时无线能量传输距离不断变化的情况,完成了一种用于无电池胎压监测SoC的电源恢复电路的设计与研究,后仿真结果表明,可以将0.8V到7.5V范围内的125kHz交流电信号转化为SoC所需的3V稳压电源,最大输出电流为10mA.完成了对各模块转换效率的分析与优化的同时,也考虑了实际工作环境中的电磁干扰等可靠性问题,能够满足无电池胎压监测SoC的电源需求.更多还原

【Abstract】 Tire Pressure Monitoring System(TPMS)is a necessary part for automobile safety.The battery-less TPMS on chip can overcome the disadvantages such as battery life and environmental pollution associated with batteries.This paper designs the main part of power recovery circuit for battery-less TPMS SoC,considering the distance of the wireless power transfer changes while the tires rolling.125 kHz is chosen as the frequency of the battery-less system,and the design is based on ASMC’s 0.35μm BCD automotive electronic technology.Back simulation result shows that the 125 kHz AC input voltage,ranging from 0.8~15V,can be converted to a 3VDC source.Maximum output current of the power recovery circuit is 10 mA.The convention efficiency is also analyzed and optimized.The electromagnet interference and reliability of the TPMS are taken into consideration.The circuit can satisfy the TPMS working requirements in the practical environment.更多还原