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Start-Stop磁致伸缩传感器转换电路

  【技术领域】

  本文章主要关于一种Start-Stop信号转换电路,尤其是应用于磁致伸缩位移传感器中,是一种将磁致伸缩位移传感器的信号转换为数字信号的高速隔离转换电路。可以方便的连接磁致伸缩位移传感器。

  【背景技术】

  目前使用较多的是电阻式位移传感器、带CAN通信功能的磁致伸缩位移传感器。电阻式位移传感器容易受外界干扰,阻值误差大,对供电电源纹波要求高,输出为模拟信号,测量精度不高。带CAN通信功能的磁致伸缩位移传感器,成本高昂。还有一种Start-Stop信号接口的磁致伸缩位移传感器,但是其信号接口特殊,客户无法直接使用。

  【解决方法】

  为了能将Start-Stop信号接口的磁致伸缩位移传感器得到广泛应用,国内某公司开发了一种Start-Stop信号转换电路,可方便的将磁致伸缩位移传感器的Start-Stop信号转换为数字信号。

  解决其技术问题所采用的技术方案是:一种Start-Stop信号转换电路,可将磁致伸缩位移传感器的信号通过高速差分转换芯片转换为数字信号,再将数字信号通过磁耦隔离后输出。

  它的效果是,将磁致伸缩位移传感器的信号转换为数字信号,其转换速度为10Mbps,信号隔离输出,保证系统稳定运行,是性价比最高的现场解决方案之一。

  【附图说明】

Start-Stop磁致伸缩传感器转换电路原理
Start-Stop磁致伸缩传感器转换电路原理

  【具体实施方式】

  图中为方案一种Start-Stop信号转换电路原理图,该电路具有抗EMC干扰、高压钳位保护和地隔离特点。图中,Start-Stop信号从J1口输入,经过串联端接电阻R1、R2、R3、R4防止信号串扰,再通过TVS保护二极管U3和U4加强抗EMC干扰能力,通过钳位保护二极管D1、D2、D3、D4、D5、D6.U1为高速差分信号转换芯片SP490EEN-L,将信号转换为数字信号,U2为高速隔离器件ADUM1201BRZ,让数字信号隔离后从J2口输出,保证系统稳定运行。