低功耗刷卡器的设计  

Design of low power card reader

作　　者：刘颖[1] 王敏[1] 文渊 徐辉 万文杰[1] 

机构地区：[1]成都理工大学核技术与自动化工程学院,成都610059

出　　处：《电子测量技术》2017年第11期197-200,共4页Electronic Measurement Technology

基　　金：国家自然科学基金(41404108);成都市惠明工程(2014-HM01-001210-SF)资助项目

摘　　要：现有刷卡系统的静态电流和读取数据时的最大电流都较大,这在一定程度上限制了其应用范围。为了使刷卡系统得到更广泛地应用,必须降低功耗,故设计了一款具有低功耗的刷卡电路,该电路采用合泰单片机作为解码和控制芯片,利用125kHz的载波信号,完成寻卡和刷卡。经过实验验证,射频读卡电路的静态电流大约为5μA,在寻卡和读卡信息时的最大电流为8mA,远远低于现有刷卡器1mA的静态电流和15mA的最大电流。因此,该读卡器的设计达到了降低功耗的预期目标,避免了原读卡器经常更换供电电池的不便,特别适用于户外场所。For the existing card reader system, operating current, to some extent, is too high to use widely. To solve this problem, it is crucial to reduce the power consumption of the system. The system in this article is designed with low power consumption card reader circuit, using Holtek MCU as decoding and controlling chip, using the carrier signal of 125 kHz to finish card searching and card reading. Experimental data show that, quiescent current of the low power consumption system is approximately 5μA, and maximum current at the time of card reading is 8 mA, which is much lower than the 1 mA quiescent current and the 15mA maximum current of the existing card reader system. Therefore, the system achieves the expected goal of reducing power consumption, and avoids replacing battery frequently. It is appropriate in the field.

关 键 词：MC9S12XS128 Manchester码 RFID读卡器 EM4100ID卡 

分 类 号：TP303.3[自动化与计算机技术—计算机系统结构]