【选型】POS机中PoE控制器的全波肖特基桥式整流、齐纳二极管、MOSFET选型推荐
在日常生活中,消费支付方式中最常见的一种就是POS刷卡消费。POS机是一种多功能终端,把它安装在信用卡的特约商户和受理网点中与计算机联成网络,就能实现电子资金自动转账,帮助客户和商家完成消费流程。而POS机多采用以太网(PoE)技术,PoE技术不仅可以在完成传输数据信号的同时,还能为POS机提供直流供电的技术。POE技术能在确保现有结构化布线安全的同时保证现有网络的正常运作,最大限度地降低POS成本,也有助于POS机的推广应用。
图1 正在完成消费交易流程的POS机
作为完成POS机数据通信以及直流供电的PoE模块,其PoE控制器的工作性能优劣将直接决定这POS机的工作性能。为了有效提升PoE能够长期稳定可靠地工作,POS机设计生产厂商必须选择稳定可靠、坚固耐用的电子元器件。本文推荐使用的是Central推出的POS机解决方案和电子元器件。解决方案如图2所示,元器件类型和型号分别为:全波肖特基桥式整流器(CBRHDSH1-100/CBRHDSH1-200/CBRHDSH2-100/CBRLDSH2-100/CBRSDSH2-100);齐纳二极管(CMOZ5L1/CMDZ5L1)和MOSFET(CEDM7002AE/CEDM8004),具体的电气参数如图3~图5所示。这些性能优异的元器件不仅可以为POS机微控制器提供稳定可靠的整流电压,还可以提供ESD防护电压,有效防止PoE控制器不会因为瞬态电压而被击穿。PoE控制器所选元器件在物理层面上保证了数据传输和直流供电的可靠性,与其他模块一起完成POS机的功能应用。
图2 Central推出的POS机解决方案:PoE控制器还为微控制模块提供供电电源
图3 全波肖特基桥式整流器(CBRHDSH1-100/CBRHDSH1-200/
CBRHDSH2-100/CBRLDSH2-100/CBRSDSH2-100)的电气参数
图4 齐纳二极管(CMOZ5L1/CMDZ5L1)的电气参数
图5 MOSFET(CEDM7002AE/CEDM8004)的电气参数
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电子商城
品牌:Central Semiconductor
品类:Surface mount-MOSFET
价格:¥0.7919
现货: 16,000
现货市场
服务
可根据用户的MOSFET管进行参数检测出具报告,静态参数最大电压:7500V、检测最大电流6000A;动态参数最大电压:3300V、检测最大电流:4500A。该测试标准满足GB、IEC及行业标准等,具备可靠性评估及老化实验能力。
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