CN205215225U - Human impedance measuring circuit - Google Patents
Human impedance measuring circuit Download PDFInfo
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- CN205215225U CN205215225U CN201520978531.8U CN201520978531U CN205215225U CN 205215225 U CN205215225 U CN 205215225U CN 201520978531 U CN201520978531 U CN 201520978531U CN 205215225 U CN205215225 U CN 205215225U
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- circuit
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- human body
- impedance measuring
- body impedance
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Abstract
Human impedance measuring circuit belongs to human impedance and measures the field, and the technical problem that solve is: current human impedance analysis measuring apparatu hardware design is complicated and development cost is high, and the technical essential is: controller control multifrequency signal generating circuit produces the alternating voltage signal, and this alternating voltage signal converts corresponding excitation current signal, this excitation current signal input to exciting electrode into by signaling conversion circuit to obtain measuring electrode's voltage signal from this, multi -channel switch is controlled by the controller, selects excitation current return circuit and measuring voltage return circuit. The effect is: through WIFI realization transmission of digital informations, the trouble that must rely on the computer at present or install the LCD demonstration data on measuring device has been solved, effective reduce cost, small, with low costs, portable come into in numerous working people's the family more easily, eight electrodes are measured and the selection of MAX14778 chip make circuit design simple, measure more accurate.
Description
Technical field
This utility model human body impedance measuring field, relates to a kind of human body impedance measuring circuit and the body impedance measurement devices by WIFI transmission measurement data.
Background technology
Bio-impedance and Human Physiology, pathology etc. closely related, therefore biological impedance technology is in continuous progress, and has the appearance of various body impedance analysis's instrument.Although current body impedance measurement devices can measure each section of resistance value of human body accurately, but their hardware designs is complicated, volume is larger, development cost is high, expensive, therefore be difficult to come in the family of numerous working people, just can only can see its figure in some large and medium-sized medical institutions; And existing body impedance analysis's instrument does not have the function of wirelessly transmitting data, therefore user does not carry out real-time effective control and management by the handheld terminal such as mobile phone, PAD to this device, is difficult to meet the demand of modern day user free control and measure device whenever and wherever possible.
Utility model content
In order to solve the technical problem that existing body impedance analysis's measuring instrument hardware designs is complicated and development cost is high, this utility model provides a kind of human body impedance measuring circuit, this measuring circuit realizes data transfer based on WIFI, formed a kind of can to the body impedance measurement devices of data remote transmission, its circuit structure is compact, hardware implementing is simple, and volume is little, easy to carry, practical.
To achieve these goals, the technical scheme that this utility model uses is: a kind of human body impedance measuring circuit, comprises controller, multiple-frequency signal circuit for generating, signaling conversion circuit, exciting electrode, measurement electrode, multidiameter option switch, canonical reference resistance;
Controller controls multiple-frequency signal circuit for generating and produces ac voltage signal, and this ac voltage signal is converted to corresponding exciting current signal by signaling conversion circuit, and this exciting current signal inputs to exciting electrode, and obtains the voltage signal of measurement electrode thus; Multidiameter option switch is controlled by controller, to exciting current loop and measuring voltage loop choice; In arbitrary exciting current loop, canonical reference resistance one end is serially connected in this exciting current loop, and the other end ground connection of canonical reference resistance.
Further, described human body impedance measuring circuit, also comprise light current pressure signal amplification circuit, filter circuit, RMS to DC circuit, analog to digital conversion circuit that signal successively connects, measurement electrode and light current press signal amplification circuit signal to be connected, and amplifying circuit analog to digital conversion circuit is connected with control device signal.
Further, described controller is also connected with radio communication mold block signal.
Further, described analog to digital conversion circuit is also connected with measured body weight circuit signal.
Further, described controller is using STM32F103 chip as main control chip, and described multiple-frequency signal circuit for generating take AD9850 as frequency generation chip, and described signaling conversion circuit operating amplifier with current feedback AD844 feeds back input voltage amplitude.
Further, described multidiameter option switch adopts 2 MAX14778 dual pathways 4:1 analog multiplexers, and draws selector channel as exciting electrode and measurement electrode.
Further, the resistance of described canonical reference resistance is 1000 ohm.
Further, described light current pressure signal amplification circuit adopts AD8221ARM and LTC6910 extract and amplify weak voltage signal, and described filter circuit adopts LTC1560 chip filter away high frequency noise.
Further, described RMS to DC circuit adopts AD637JR to extract the virtual value of signal.
Further, described wireless communication module is that WM-G-MR-09WIFI module or ESP8266 serial ports turn WIFI module or other WIFI module.
The beneficial effects of the utility model are: described human body impedance measuring circuit, and its circuit structure is compact, and hardware implementing is simple, practical, and user can be managed measuring circuit by wireless communication module and control.
Accompanying drawing explanation
Fig. 1 is the structural representation of human body impedance measuring circuit of the present utility model;
Fig. 2 is the relation schematic diagram that measurement electrode is connected with human body;
Fig. 3 is the schematic diagram of the communication of human body impedance measuring circuit in embodiment and mobile phone terminal.
Detailed description of the invention
Embodiment 1: composition graphs 1 and Fig. 2, present embodiments provide a kind of human body impedance measuring circuit, comprise controller 2, multiple-frequency signal circuit for generating 3, signaling conversion circuit 4, exciting electrode 5, measurement electrode 6, multidiameter option switch 7, canonical reference resistance 8, light current pressure signal amplification circuit 9, filter circuit 10, RMS to DC circuit 11, analog to digital conversion circuit 12;
Controller 2 controls multiple-frequency signal circuit for generating 3 and produces ac voltage signal, this ac voltage signal is converted to corresponding exciting current signal by signaling conversion circuit 4, this exciting current signal inputs to exciting electrode 5, and obtains the voltage signal of measurement electrode 6 thus; Multidiameter option switch 7 is controlled by controller 2, to exciting current loop and measuring voltage loop choice; In arbitrary exciting current loop, canonical reference resistance 8 one end is serially connected in this exciting current loop, and the other end ground connection of canonical reference resistance.
Light current pressure signal amplification circuit 9, filter circuit 10, RMS to DC circuit 11, analog to digital conversion circuit 12 successively signal connect, and measurement electrode 6 and light current press signal amplification circuit 9 signal to be connected, and analog to digital conversion circuit 12 is connected with controller 2 signal.
Described measuring circuit each several part is powered by power supply 1.Wherein, controller can be single-chip microcomputer, and analog to digital conversion circuit 12 can be the external circuit be connected with single-chip microcomputer, also can adopt the AD of single-chip microcomputer inside, and namely side circuit directly holding wire is directly connected realization with the respective pins of single-chip microcomputer.
The measuring circuit of the present embodiment, human body impedance is equivalent to trunk and extremity 5 sections of impedance models, 4 exciting electrodes of measuring circuit contact with left and right forefoot with human body left and right wrist respectively, 4 voltage measurement electrodes of measuring circuit respectively with left and right two palm and left and right heel contact.A kind of method using described measuring circuit to measure human body impedance is:
S1: controller controls the ac voltage signal that multiple-frequency signal circuit for generating sends initial frequency 10kHZ.
S2: ac voltage signal converts through signaling conversion circuit the human-body safety exciting current signal that virtual value is less than 100uA to.
S3: under the control of the controller, by variable connector pair and exciting current loop and measuring voltage loop choice, the Measurement channel under often kind of frequency is:
Exciting current forms loop 1 by I1-R1-R2-I2-R, and measuring circuit: V1-V2, can obtain the resistance of R1+R2 according to the value of reference resistance R;
Exciting current forms loop 2 by I3-R3-R4-I4-R, and measuring circuit: V3-V4, can obtain the resistance of R3+R4 according to the value of reference resistance R;
Exciting current forms loop 3 by I1-R1-R5-R3-I3-R, and measuring circuit: V1-V3, can obtain the resistance of R1+R5+R3 according to the value of reference resistance R;
Exciting current forms loop 4 by I2-R2-R5-R4-I4-R, and measuring circuit: V2-V4, can obtain the resistance of R2+R5+R4 according to the value of reference resistance R;
Exciting current forms loop 5 by I1-R1-R5-R4-I4-R, and measuring circuit: V1-V4, can obtain the resistance of R1+R5+R4 according to the value of reference resistance R.
S4. at each measuring circuit, the measurement electrode under the control of the controller in good time magnitude of voltage carrying out each section of human body equiva lent impedance is measured, and it is amplified, filtering and RMS to DC;
S5: analog to digital conversion circuit carries out analog digital conversion to the voltage signal measuring each measurement electrode obtained, and calculating correction is carried out to it, finally obtain human body each section of resistance value accurately, wherein, the calculating of resistance value is completed by controller, it calculates data from the resistance of above-mentioned reference resistance and measuring voltage, namely can obtain equation and 5 unknown numbers of 5 linear independences from above, calculates the resistance obtaining R1 ~ R5.
S6: conversion frequency value, the process according to above-mentioned steps continues to measure.
Embodiment 2: there is the technical scheme identical with embodiment 1, more specifically, controller 2 in the present embodiment is also connected with wireless communication module 13 signal, preferably, this wireless communication module 13 is WIFI module, and use this wireless communication module, after measurement, controller executes algorithm and obtains the equivalent impedance that partes corporis humani divides, this value directly can be transferred to device end by measuring circuit, corresponding display routine is set in device end correspondence, measures data and just can be transferred on user terminal by wireless communication module and show.
Increase this wireless communication module, when using described measuring circuit, can first using mobile phone searching signal R_TEST initializing signal, after input password, connecting this signal; After successful connection, open impedance measurement software on mobile phone, select metering system; Two kinds of metering systems are provided: frequency-selecting is measured and automatically measured in the present embodiment.To be automatically measured as example, system default initial frequency is 10kHZ, and step-length is 5kHZ, and termination frequency is 100kHZ.
In addition, also corresponding software can be used at terminal unit, to control the control of controller for multiple-frequency signal circuit for generating, thus make tester by hand-held mobile terminal access to wireless communication modules such as the mobile phone of oneself, PAD, then open corresponding application software and select metering system, the metering system that controller can be selected according to user controls multiple-frequency signal circuit for generating and generates ac voltage signal, or selects the rate-adaptive pacemaker of acquiescence.Measuring circuit in the present embodiment, greatly convenient tester, for the control and management of test, improves test body empirically.And use terminal handheld device, no longer need the cooperation of computer or LCD touch display screen, greatly reduce development cost, can by more convenient for described measuring circuit and be widely used in the clinical and research field based on human body impedance characteristic such as bioelectrical impedance analysis, human bloodstream figure measurement, gastric motor disovder detection, and the hardware designs of the measuring circuit in the present embodiment is simple, hardware and software cost is all lower, and market prospect is good.
Embodiment 3: there is the technical scheme identical with embodiment 1 or 2, more specifically, described analog to digital conversion circuit 12 is also connected with measured body weight circuit 14 signal, acquisition volume remeasurement data, when body impedance analysis, as reference data, and measured body weight circuit is more conventional measuring circuit, will not describe in detail at this, wherein, analog to digital conversion circuit 12 can be the external circuit be connected with single-chip microcomputer, also can adopt the AD of single-chip microcomputer inside, and namely side circuit directly holding wire is directly connected realization with the respective pins of single-chip microcomputer.
Embodiment 4: have and the identical technical scheme of embodiment 1 or 2 or 3, more specifically, the present embodiment for embodiment 1 or 2 or 3 or in technical scheme in, each components and parts related to carry out type selecting: described controller 2 is using STM32F103 chip as main control chip, described multiple-frequency signal circuit for generating 3 take AD9850 as frequency generation chip, and described signaling conversion circuit 4 operating amplifier with current feedback AD844 feeds back input voltage amplitude.Described multidiameter option switch 7 adopts 2 MAX14778 dual pathways 4:1 analog multiplexers; and selector channel is drawn as exciting electrode 5 and measurement electrode 6; the selection of this kind of chip; due to without the need to increasing esd protection circuit again, make the compacter and circuit small volume of circuit structure.The resistance of described canonical reference resistance 8 is 1000 ohm.Described light current pressure signal amplification circuit 9 adopts AD8221ARM and LTC6910 extract and amplify weak voltage signal, and described filter circuit 10 adopts LTC1560 chip filter away high frequency noise.Described RMS to DC circuit 11 adopts AD637JR to extract the virtual value of signal.Described wireless communication module 13 turns WIFI module for WM-G-MR-09 (marvell8686) module or ESP8266 serial ports, wherein: the signal that WM-G-MR-09 module sends as AP can only be connected with Fructus Mali pumilae terminal and computer, this module and Fructus Mali pumilae terminal or computer is selected to carry out data transmission, but this module does not have corresponding agreement support for Android mobile phone, therefore Android mobile phone can not be connected, and select this module of ESP8266 just can realize the communication with Android mobile phone, type selecting for wireless communication module can adaptive different terminal unit, coverage is more extensive.
The measuring circuit that the present embodiment provides, in circuit design, volume is little, is easy to carry and cost is little, in data transmission, because it is based on WIFI, make transmission convenient, in measuring accuracy, owing to employing 8 electrodes, contact human skin's resistance can be eliminated, measure more accurate.
The above; be only this utility model preferably detailed description of the invention; but protection domain of the present utility model is not limited thereto; anyly be familiar with those skilled in the art in the technical scope that this utility model discloses; be equal to according to the technical solution of the utility model and utility model design thereof and replace or change, all should be encompassed within protection domain of the present utility model.
Claims (10)
1. a human body impedance measuring circuit, is characterized in that: comprise controller (2), multiple-frequency signal circuit for generating (3), signaling conversion circuit (4), exciting electrode (5), measurement electrode (6), multidiameter option switch (7), canonical reference resistance (8);
Controller (2) controls multiple-frequency signal circuit for generating (3) and produces ac voltage signal, this ac voltage signal is converted to corresponding exciting current signal by signaling conversion circuit (4), this exciting current signal inputs to exciting electrode (5), and obtains the voltage signal of measurement electrode (6) thus; Multidiameter option switch (7) is controlled by controller, to exciting current loop and measuring voltage loop choice; In arbitrary exciting current loop, canonical reference resistance (8) one end is serially connected in this exciting current loop, and the other end ground connection of canonical reference resistance (8).
2. human body impedance measuring circuit as claimed in claim 1, it is characterized in that, also comprise light current pressure signal amplification circuit (9), filter circuit (10), RMS to DC circuit (11), analog to digital conversion circuit (12) that signal successively connects, measurement electrode (6) and light current press signal amplification circuit (9) signal to be connected, and analog to digital conversion circuit (12) is connected with controller (2) signal.
3. human body impedance measuring circuit as claimed in claim 1, it is characterized in that, described controller (2) is also connected with wireless communication module (13) signal.
4. human body impedance measuring circuit as claimed in claim 2, it is characterized in that, described analog to digital conversion circuit (12) is also connected with measured body weight circuit (14) signal.
5. human body impedance measuring circuit as claimed in claim 1, it is characterized in that, described controller (2) is using STM32F103 chip as main control chip, described multiple-frequency signal circuit for generating (3) take AD9850 as frequency generation chip, and described signaling conversion circuit (4) operating amplifier with current feedback AD844 feeds back input voltage amplitude.
6. human body impedance measuring circuit as claimed in claim 1, it is characterized in that: described multidiameter option switch (7) adopts 2 MAX14778 dual pathways 4:1 analog multiplexers, and selector channel is drawn as exciting electrode (5) and measurement electrode (6).
7. human body impedance measuring circuit as claimed in claim 1, is characterized in that: the resistance of described canonical reference resistance (8) is 1000 ohm.
8. human body impedance measuring circuit as claimed in claim 2, it is characterized in that: described light current pressure signal amplification circuit (9) adopts AD8221ARM and LTC6910 extract and amplify weak voltage signal, described filter circuit (10) adopts LTC1560 chip filter away high frequency noise.
9. human body impedance measuring circuit as claimed in claim 2, is characterized in that: described RMS to DC circuit (11) adopts AD637JR to extract the virtual value of signal.
10. human body impedance measuring circuit as claimed in claim 3, is characterized in that: described wireless communication module (13) turns WIFI module or other WIFI module or other wireless communication modules for WM-G-MR-09WIFI module or ESP8266 serial ports.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520978531.8U CN205215225U (en) | 2015-11-27 | 2015-11-27 | Human impedance measuring circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520978531.8U CN205215225U (en) | 2015-11-27 | 2015-11-27 | Human impedance measuring circuit |
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| Publication Number | Publication Date |
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| CN205215225U true CN205215225U (en) | 2016-05-11 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201520978531.8U Expired - Fee Related CN205215225U (en) | 2015-11-27 | 2015-11-27 | Human impedance measuring circuit |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107727914A (en) * | 2017-09-29 | 2018-02-23 | 苏州涟漪信息科技有限公司 | Signal measurement apparatus |
| CN108269393A (en) * | 2018-02-11 | 2018-07-10 | 许少辉 | The signal calibration circuit of medical remote monitoring system |
| CN111281386A (en) * | 2020-03-06 | 2020-06-16 | 芯海科技（深圳）股份有限公司 | Human body impedance detection circuit, chip, device and intelligent equipment |
-
2015
- 2015-11-27 CN CN201520978531.8U patent/CN205215225U/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107727914A (en) * | 2017-09-29 | 2018-02-23 | 苏州涟漪信息科技有限公司 | Signal measurement apparatus |
| CN108269393A (en) * | 2018-02-11 | 2018-07-10 | 许少辉 | The signal calibration circuit of medical remote monitoring system |
| CN111281386A (en) * | 2020-03-06 | 2020-06-16 | 芯海科技（深圳）股份有限公司 | Human body impedance detection circuit, chip, device and intelligent equipment |
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| Date | Code | Title | Description |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20160511 Termination date: 20161127 |
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| CF01 | Termination of patent right due to non-payment of annual fee |