【应用】使用表面贴装N通道JFET CMPF5484驱动压电陶瓷片检测人体心音及吸呼信号

时间： 2019-12-08 来源：世强

技术问答

一、方案简介

本方案目的实现检测睡眠状态下人体的心音信号及呼吸信号，并进行图形化展示。本着高可靠、低成本、易于制造的设计理念，本次设计将采用压电陶瓷片作为前端采集传感器。系统原理框图如下：

图1 系统原理框图

前端压电陶瓷片采集到的人体体动信号（包含心音、呼吸信号）经过中央半导体公司生产的表面贴装N通道JFET——CMPF5484反相并放大后送入单片机数据平滑处理后送到PC进行图形显示。

二．详细设计

2.1传感器设计

传感器采用压电陶瓷片，因为压电陶瓷片具有很高的灵敏度及信噪比，非常适合用来采集微弱的心音信号。当然压电陶瓷片本身还不能直接应用于本方案，需要对其加以封装，具体结构示意图如下：

图2 传感器侧面示意图

振动传导片（弹性钢片）用于将人体的体动信号（包含心音及呼吸）传导至压电陶瓷片；

胶垫是防止振动传导片压碎压电陶瓷片，并起至振动信号传导作用；

底部衬板同样是防止压电陶瓷片被压碎，并起到一定的支撑作用。

2.2信号采集原理图

本方案的关键技术在于前端信号采集及处理，所以仅展示前端信号部分，单片机部分不做展示。压电陶瓷片采集到的信号处理电路如下：

图3 信号处理电路

压电陶瓷片受到外力振动时自身会产生电动势（电压信号）所以不需要外部电源激励。

为减少传感器组件与信号采集单元之间电缆的芯数（只需两芯线即可），R4上拉电阻被放置在信号采集单元。

电路中R9为压电陶瓷片的匹配电阻，一方面调理信号降低信号噪声，另一方面防止压电陶瓷受到冲击时释放高电压，烧坏后端电路，当然后面的JEFT（CMPF5484）内部的二极管也会起到钳位作用（内部结构见下图）。

图4 CMPF5484 内部示意图

CMPF5484的漏源电压为25V，而同类IC（如2SK1109）仅为20V。

CMPF5484的漏极电流达到30mA，而同类IC（如2SK1109）仅为10mA。

而且CMPF5484具有更高的带宽，从而保证了信号的完整性。

2.3传感器PCB

压电陶瓷片驱动电路很简单，所以LAYOUT直接放置在压电陶瓷片本体上。

图5 传感器PCB

2.4传感器实物展示

压电陶瓷片选用的是41mm直径的，传感器PCB直接装于压电陶瓷片本体上，陶瓷片中心粘贴橡胶垫（直径8mm，厚3mm），底部粘贴钢制衬板(直径41mm)，见下图。

图6 传感器PCB安装图

然后上面放置振动传导钢片，传感器位于传导钢片的中心点上，见下图。

图7 传感器整体实物图

2.5试验数据

将传感器组件放置于床板与床垫之间，即保证了信号的正常采集，也不影响睡眠舒适度。传感器采集到的体动信号被传送到PC上转为图形显示。部分信号展示如下：

图5 心音、呼吸信号

上图中的红色曲线为压电陶瓷片采集到的原始信号；

绿色曲线为原始信号经过数字低通算法处理后的呼吸信号；

蓝色曲线为原始信号经过数字高通算法处理后的心音信号。

注：

低通数字滤波器

y(n) = ax(n) + (1-a)y(n-1)

高通数字滤波器

y(n) = ay(n-1) + a(x(n) – x(n-1))

x(n)为本次采样值，x(n-1)为上次采样值，y(n-1)为上次的滤波输出值； y(n)为本次滤波输出值。a为滤波系数，通常远小于1。

三、小结

使用低成本的元件即可实现对人体心音信号及呼吸信号的采集，后期可以对采集到的信号做深度分析研究，为广大用户提供健康睡眠状态评价。本文使用的CMPF5484是一个不错的选择。

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redsky Lv5. 技术专家 2021-01-19

谢谢，正需要

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Central Semiconductor（中央半导体）二极管选型指南

目录- Switching Diodes Schottky Diodes Low Leakage Diodes/Ultra Low Leakage Diodes/Stabistor Diodes/Current Limiting Diodes High Current, Current Limiting Diodes Temperature Compensated Zener Diodes Zener Diodes

型号- CMDZ10L,CMOZ6L8,CMZ5935B,CMPZDC12V,CTLZ3V9,CMPZDC2V7,CMPZDC36V,CMSZ5252B,CMOZ6L2,CMPZ4614*,CLL4730A,CMLZDA9V1,CMPD7000E,CLL4754A,CMPD2003,CMDZ10V,CMHZ5265B*,CMZ5381B,CMDZ11L,CMZ5936B,CMFSH-3I,CMPZDC13V,CMPD2004,CMPZ5625,CMSZ5253B,CMXZ30VTO,BZV55C5V1,BZV55C5V6,CMXZ39VTO*,CLL4753A,CMDZ11V,CMUDW6001,CMUD6263E,CMZ5382B,CMDZ12L,CMSZ5250B,CMZ5933B,CMDZ36L,CLL4752A,CMKD7000E,CMHZ5229B,CMPZDC15V,CMPZDC39V,CMDZ12V,CMDZ2V6,CMDZ2V7,CMDZ36V,CMDZ2V4,CMDZ13L,CMZ5934B,CFSH05-20L,CMDSH05-45,CMSZ5251B,CMLD6263DO,SH2-30L,CMXSTB400,CMPD6263S,CLL4750A,CLL4751A,1001,SH2-3L,CMHZ5228B,CMPZDC16V,CMZ5380B,CMPD6263A,CMDZ13V,CMPD6263C,CMUD7000,CTLZ5V1,CMDZ30L,CMOZ4L7,CMZ5955B,CTLZ5V6,CMDZ5251B,CMOZ4L3,SWITCHING DIODES,CMXSTB200,CMDZ30V,CMZ5931B,CMPZ5261B,CMHZ5227B,2838E,CMPSH05-4,CMZ5956B,CMZ5932B,CMDZ5250B,BZV55C7V5,CMPSH-3SE,CMPZ5260B,CMPZDC18V,CMXZ4V7TO*,CMHZ5226B,CMKZ5239B*,CURRENT LIMITING DIODES,CMPSH-3,CMPZ5263B,CMZ5953B,CMDZ4V7,CMHZ5225B,CMHZ5249B,CMDZ4V3,CMHZ5263B*,CMDZ33L,2836E,CMZ5954B,CMOZ8V2,CMDZ33V,CMDSH2-4L,CMPZ5262B,CMZ5930B,CMHZ5224B,CMHZ5248B,CMOZ2L7,CMDZ5255B,CMLSH2-4LC,CMDZ5231B,CTLZ7V5,CMLSH2-4LA,CMOZ2L0,CMOZ2L2,CMOZ2L4,CMOZ2L5,CMDZ2L8,CMHZ5223B,CMDZ2L7,BZX84C9V1,CMDZ2L4,CMDZ2L2,CMLZDA5V1,CMDZ2L0,CLL4738A,CMZ5951B,CMJH180,CMKZ5241B*,CMHZ5247B,CMXZ3V9TO*,CMKSH-3DO,CMDZ5254B,CMDZ5230B,BZV55C9V1,CMUD2836,457A,CMHZ5222B,CMUD2838,3004,3003,CTLSH05-40M621,CLL4737A,CMZ5952B,CMKZ5252B*,CMKD6263,CMHZ5246B,CMSZDA8V2,CMLSH-4DO,CMOSH-3,CMDZ5253B,CMOZ6V8,CMHZ5221B,CMHZ5245B,CMDZ6V8,ZENER DIODES,CLL4736A,CMKZ5228B*,CMDZ6V2,CMDSH-3,CMDZ5252B,CMLZDA7V5,459A,CMLD2004DO,CMHZ5244B,CMOZ6V2,CMXZ6V2TO*,CLL4735A,CLL4759A,LOW LEAKAGE DIODES,CMZ5950B,CMDZ5259B,CMPD2838,CMDZ5235B,CMPZ4109,CMPZDA9V1,CMPZ4107,CMXZ2V7TO*,CMXZ36VTO*,CMPZ4108,CMPZ4105,CMPZ4106,CMPZ4103,CMPZ4104,CMPZ4101,CMOZ30V,CMPZ4102,CMPD2836,CMPZ4100,CMHZ5243B,CMDZ4L7,BZX84C7V5,CMLZDA3V6,CMDZ4L3,CMLZDA3V0,CLL4734A,CMLZDA3V3,CLL4758A,CMHZ5267B*,CMDZ5258B,CMDZ5234B,CMHZ4700,CMLZDA20V,CMHZ5242B,CMOZ30L,CLL4733A,CMXD2004,CLL4757A,CMKZ5250B*,CMJH150,4150,CMDZ5257B,5001,CMDZ5233B,CMHZ4710,CMHZ4711,CMOZ4V7,CMZ5339B,CMPZ4123,CMPZ4124,CMPZ4121,CMXZ3V0TO*,CMLZDA43V,CMPZ4122,CMHZ4709,CMPZ4120,CLL4732A,CLL4756A,CMHZ5241B,CMKZ5261B*,CMHZ4701,CMHZ4702,CMDZ8V2,CMHZ4703,CMHZ4704,CMHZ4705,CTLSH1-40M621H,CMJH120,CMHZ4706,CMOZ33L,CMHZ4707,CMHZ4708,CMDZ5256B,CMPZ4118,CMDZ5232B,CMPZ4119,CMUSH05-4,CMPZ4116,CMPZ4117,CMPZ4114,CMPZ4115,CMPZ4112,CMLZDA5V6,CMPZ4113,CMPZ4110,CMPZ4111,CLL4731A,STB400,CLL4755A,CMXD4448,CMOZ4V3,CMHZ5240B,CMHZ4712,CMHZ4713,CMHZ4714,CMHZ4715,CMHZ4716,CMUD6263SE,CMHZ4717,CMPZ5249B,CMDZ5227B,CMKZ5257B*,CMPZ5225B,CMXTC935A,CMZ5349B,CMOZ10V,BZX84C5V6,CMSZDA33V,CMDZ6L2,CMXD2004S,CMJH100,BZX84C5V1,CMHZ5251B,CLL5256B,CMLD3003DO,CMDZ5228B,CMOZ11L,CMDZ5226B,CMKZ5222B,CMPZ5248B,CMPZ5224B,CMOZ33V,CMXZ5V6TO*,CMLD6001,CMDZ6L8,CMLZDA12V,CMPZ4099,CMSSH-3CE,CMOZ10L,CMLZDA13V,CMHZ5250B,CLL5255B,CMSZDA4V3,CMXZ4V3TO*,CMXZ43VTO*,CMKZ5233B*,CMSZDA4V7,CLL5231B,CMPZ5227B,CMDZ5249B,CMPZDA6V8,CMDZ5225B,CMPZDA6V2,CMOZ12V,CMLZDA11V,CMSZDA11V,CMLZDA2V7,CMLZDA36V,CMZ5347B,BAS56,CMOZ13V,CMLZDA2V4,CLL5254B,CMHD4150,CMOZ13L,CMSD6001,CMKZ5244B*,CLL5230B,CMSD2004S,CMKZ5224B*,CMDZ5248B,CMPZ5226B,CMDZ5224B,CMXZ20VTO*,CMOZ11V,CMLD6263,CMLZDA10V,CMSZDA10V,CMOZ2V4,CMOZ2V6,CMZ5348B,CMOZ2V7,CMOZ36V,CMOZ36L,CMSSH-3AE,CMKZ5255B*,CMOZ12L,CLL5253B,7000,CMPSH-3AE,CMPZ5229B,CMPZDC8V2,CMOD3003,CMXZ18VTO*,CMPZDA30V,CMPD6001,CMDZ8L2,BZX84C3V9,CMSZ5228B,CMOZ39V,BZX84C3V6,CMOZ15V,CMZ5369B,CMZ5345B,CLL457A,BZX84C3V3,CMLZDA18V,CMOZ39L,BZX84C3V0,CMOZ15L,CLL5252B,CMPZ5228B,CMHD459A,CLL5224B*,CMJ1000,CMJ4500,CMSZ5229B,CMSZDA6V8,CMZ5346B,CMSD2005S,CMKZ5231B*,CLL5251B,CMSZDA6V2,CMKZ5221B,CMPZDA4V7,CMKZ5245B,CMPZDA4V3,CMSZ5226B,CMZ5343B,CMLZDA16V,CLL459A,CMZ5367B,CTLSH01-30,CMKZ5242B*,CLL5250B,CMKZ5226B*,CMPD6263,CMPZDA33V,CMXZ3V3TO*,CMJ0130,CMLZDA15V,CMSZ5227B,CMZ5344B,CMSZDA30V,CMOZ16V,CMLZDA39V,CMZ5368B,CMPZDC6V2,BAS28,457A CMHD457A,CLL4739A,CMOZ16L,CMKZ5253B*,CMDZ5229B,CMPZ4707,CMPZDA10V,CMPZ4708,CMPZ4705,CMPZDC6V8,CMPZ4706,CMPZ4703,CMPZ4704,CMPZ4701,CMPZ4702,CFSH01-30,CMPZ4700,CMSZ5224B,CMZ5919B,CMSZ5248B,CMZ5365B,CMPZ5241B,CMHSH-3,CMPZ5265B,CMHZ4100,CMHZ4101,CMHZ4102,CMPZDA11V,CMHZ4103,CMHZ4104,CMHZ4105,CMHZ4106,CMGSH1-3,CMSZ5225B,CMSZ5249B,SH05-20L,CMZ5366B,CMOZ18V,CMZ5342B,CMOZ18L,CMPZ5240B,CMPZDA2V4,CMSZDA16V,2838,2836,CLL3232B,CMPZ5264B,CMOZ9L1,CMHZ4110,CMZ5917B,CMHZ4111,CMPZDC30V,CMKZ5237B*,CMHZ4112,CMPZDA12V,CMHZ4113,CMHZ4114,CMPZDA2V7,CMPZDA36V,CMHZ4115,CMHZ4116,CMPSH-3CE,CMLD6001DO,CLL5239B,CMHZ4117,CMSZ5222B,CMSZ5246B,CFD4448,CMLSH05-4,CMZ5387B,CMZ5363B,CMHZ4107,CMHZ4108,CMHZ4109,CMPZ5267B,CMPZ5243B,CMHZ4121,CMHZ4122,CMXZ33VTO*,CMKZ5248B*,CMHZ4123,CMPZ4716,CMHZ4124,CMPZ4717,CMHZ4125,CMPZ4714,CMPZ4715,CMPZDA13V,CLL5238B,CMPZ4712,CMPZ4713,CMPZ4710,CMPZ4711,CMSZ5223B,CMSZ5247B,CMHZ4120,CMZ5918B,CMZ5388B,CMZ5364B,CMHZ4118,CMSZDA18V,CED2838E,CMHZ4119,CMPZDC4V3,CMPZ5266B,CMZ5340B,CMPZ4709,CFSH2-3L,CMPZ5242B,CMZ5939B,CMZ5915B,CMKZ5259B*,CMDD3003,CLL5237B,CMPZDC4V7,CMXD3004SR,CMSZ5244B,SH1-3,CMZ5385B,CMPZDA39V,CMSD6263,CMPZ

选型指南 - CENTRAL SEMICONDUCTOR - 2020/2/27 PDF 英文下载

【方案】脉搏血氧仪之Central Semiconductor（中央半导体）型号推荐

描述- 目前医疗设备发展的趋势是将更大的诊断设备集中到更小和更轻的交互式移动单元中。脉搏血氧计间接监测患者的血氧饱和度，是精简和可用的最新家用设备。脉搏血氧计利用光来测量血红蛋白状况，并且在连接监视器时，存储和交换关键的患者数据。 Central Semiconductor（中央半导体）小轮廓和高效率产品可提供给这些新技术一个非常适合的解决方案。

型号- CMUT3904,CMUT5087E TR,CMST7410 BK,CMLM2205,CMLM0705,CMUT3906,CMUDM8005,CFSH01-30,CSL05D,CMUT5088E,CMUT7410 BK,CMST7410,CMLDM7005,CMF12A,CMF9.0A,CMF6.5A,CMLM0584,CMF5.0A,CMLM0305T,CMUT3904 TR,CMDD2004,CMLSH-4,CMLSH1-40,CMF8.5A,CMUT5087E,CMUT5088E TR,CMUT7410 TR,CMASH-4,CSL05,CMUT7410,CMF11A,CMST7410 TR,CMUT3906 BK,CMF8.0A,CEDM8004,CMLSH-4 TR,CMUT3410,CMLM0574,CMUT5088E BK,CMF7.5A,CMUT3410 TR,CMOSH-3,CMLD4448 BK,CMNTVS12V,CMLSH05-4,CMLD4448,CMF10A,CTLSH01-30,CMF7.0A,CMAD4448,CMLDM8002A,CTLSH01-30L,CMUT3906 TR,CMUDM7005,CTLT7410-M621 TR,CMLDM7002A,CMUD6263CE,CMLSH-4 BK,CMUT3410 BK,CMLD4448 TR,CMUT5087E BK,CTLT7410-M621,CMUT3904 BK,CMF6.0A,CMRSH-4DO

应用及方案 - CENTRAL SEMICONDUCTOR - 2017年03月03日 PDF 英文下载

【方案】电子电表（智能电表）之Central Semiconductor（中央半导体）型号推荐

描述- 全球的能源需求是永无止境的。随着能源需求的增加，消费的实时监测和监管越来越重要。智能计量可以协调能源生产和需求之间的平衡，立即报告中断，并为消费者提供管理个人消费的工具。 Central Semiconductor（中央半导体）分立器件对智能电表有效可靠运行至关重要，可用于智能电表拓扑的所有功能。

型号- CMUT3904,CZT2222A BK,1.5SMC200CA BK,P6SMB,CMUT3906,CMUDM8005,CSL05D,CMR2U-06,3SMC,CMJH100,CMOZ15V,CMLDM7005,CMUT3904 TR,CMKSH-3T,CTLTVS12,CBR4M-L040,CZT2222A,1SMC170CA,1.5SMC200CA,CBR1-D040S,CMOZ3V3,CMASH-4,CBR1-D060S,CMXD2004,CSL05,CMUT3906 BK,1SMC170CA TR13,CMJH150,CZT2222A TR,CMHZ5226B,CMPDM302PH,CBR2-D060S TR13,CMR3U-06M,CBR2-D040S,CBR2-D060S,CMNTVS12V,1.5SMC,1SMC,CMLSH05-4,CMOD2005,CMHZ5245B,CMSH3-60M,P6SMB200CA,3SMC170CA,CMPLC1V5D,1.5SMC200CA TR13,CMUT3906 TR,CMUDM7005,CMPDM203NH,CMSH5-60,1SMC170CA BK,1SMB170CA,CMUT3904 BK,CMRSH-4DO

应用及方案 - CENTRAL SEMICONDUCTOR - 2017年01月09日 PDF 英文下载