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磁致伸缩位移传感器激励信号驱动电路

  磁致伸缩位移传感器激励信号驱动电路包括频率可调、脉宽可调的窄脉冲发生电路及窄脉冲驱动电路。

  1、窄脉冲发生电路

  驱动波导丝的脉冲信号频率及脉冲宽度对接收信号的信噪比及信号强度影响较大。故需设计一频率可调、脉宽可调的窄脉冲发生电路。

  窄脉冲信号发生电路包括由NE555构成的多谐振荡器及由74HC123构成的单稳态触发电路。通过调节多谐振荡器与单稳态触发电路的电阻值可分别实现窄脉冲信号频率和脉宽的调节。

  在接收电路调试完成后,需针对接收信号调整驱动信号频率及脉宽,提高回拨信号幅值并改善回波信号的信噪比。

  2、窄脉冲驱动电路

  磁致伸缩位移传感器驱动波导丝需要为其提供大电流脉冲信号,74HC123的电流输出无法满足驱动波导丝的要求。

磁致伸缩位移传感器窄脉冲驱动电路
磁致伸缩位移传感器窄脉冲驱动电路

  本研究设计了如上图所示的大电流窄脉冲驱动电路。

  窄脉冲驱动电路由2个三极管和1个MOS管构成。第1级为共射极放大电路,用于将5V的窄脉冲信号放大至15V;第2级为射极跟随器,用于在第1级和第3级间进行阻抗匹配,提高带负载能力以驱动MOS管。

  当MOS管导通时,P₁两端压降略小于电源电压15V,波导丝电阻约为5Ω,计算可知波导丝的脉冲驱动电流可达2~3A。