CN204072092U - Square-wave signal is utilized to carry out circuit and the fat scale of multifrequency point human body impedance measuring - Google Patents
Square-wave signal is utilized to carry out circuit and the fat scale of multifrequency point human body impedance measuring Download PDFInfo
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- CN204072092U CN204072092U CN201420535411.6U CN201420535411U CN204072092U CN 204072092 U CN204072092 U CN 204072092U CN 201420535411 U CN201420535411 U CN 201420535411U CN 204072092 U CN204072092 U CN 204072092U
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Abstract
The utility model discloses a kind of circuit utilizing square-wave signal to carry out multifrequency point human body impedance measuring, signal generator is made up of square wave signal generator and second-order low-pass filter circuit, produces multiple harmonic voltage signal; The input of the outfan access voltage-controlled current source of signal generator, harmonic voltage signal is converted to the current source signal of 1mA amplitude by voltage-controlled current source, as the pumping signal applied human body; The voltage signal that multiway analog switch switching at runtime aforementioned excitation signal produces on human body and reference resistance is to signal amplification circuit; Signal amplification circuit is amplified in the response simulation voltage signal that human body under aforementioned excitation signal function or reference resistance produce; The input of the outfan access analog to digital conversion circuit of signal amplification circuit, analog to digital conversion circuit carries out digitized to the aforementioned response simulation voltage signal sampled, and is converted to digital signal; The human body impedance value under square-wave signal excitation of aforementioned one-tenth odd-multiple has been tested, and can carry out the impedance computation of each frequency.
Description
Technical field
This utility model relates to a kind of circuit utilizing square-wave signal to carry out multifrequency point human body impedance measuring; In addition, this utility model also relates to a kind of fat scale with aforementioned multifrequency point human body impedance measuring circuit.
Background technology
Current fat scale is, by high-precision pressure sensor, the weight of human body is converted to the signal of telecommunication, the signal of telecommunication delivers to MCU microprocessor after signal amplification unit and AD conversion unit, MCU microprocessor is analyzed signal, calculate body weight value of coming in and going out, and then measure human body resistance by the metal electrode film on weighing tray, utilize bioelectrical impedance analysis in conjunction with human body related data, setting up math equation total score separates out into body fat, BMI (body-mass index), every health index such as non-fat amount, show finally by LCD, the physical condition of effective assignor.
Electrical Bioimpedance Measurement Technology (Bioelectric Impedance Measuring Technology) is the electrical characteristics (impedance utilizing biological tissue and organ, admittance, dielectric constant etc.) and change, extract and Human Physiology, a kind of lossless decomposition technology of the biomedical information that pathological condition is correlated with.It normally applies small alternating current (or voltage) signal by the exciting electrode being placed in body surface to measurand, detected voltage (or electric current) signal of tissue surface by measurement electrode simultaneously, corresponding electrical impedance and change thereof is calculated by measured signal, then according to different application purposes, relevant physiology and pathological information is obtained.The features such as this technology or method have noinvasive, cheap, and safety is nontoxic, easy and simple to handle and abundant information, are with a wide range of applications.
Fat scale is exactly a kind of device utilizing Electrical Bioimpedance Measurement Technology to carry out human body composition analysis, and in prior art, fat scale is all carry out impedance measurement by single-frequency (being generally 50KHz).Because human body is different to the response of different frequency signals, the measurement of human body impedance under single-frequency, effectively can not obtain and can obtain more accurate and comprehensive Human Physiology and pathological parameter.
Utility model content
For the above-mentioned deficiency of prior art, according to embodiment of the present utility model, wish to propose a kind of structure simple, the circuit that the impedance of any number of frequency is measured can be realized; And the fat scale utilizing aforementioned circuit to carry out the DATA REASONING such as human body weight, fat percentage, body-mass index, body water/muscle/skeleton content is provided.
According to embodiment, a kind of circuit utilizing square-wave signal to carry out multifrequency point human body impedance measuring that this utility model provides, its innovative point is, comprise signal generator, voltage-controlled current source, multiway analog switch, signal amplification circuit, analog to digital conversion circuit and analog to digital conversion circuit, signal generator is made up of square wave signal generator and second-order low-pass filter circuit, produces multiple harmonic voltage signal; The input of the outfan access voltage-controlled current source of signal generator, harmonic voltage signal is converted to the current source signal of 1mA amplitude by voltage-controlled current source, as the pumping signal applied human body; The voltage signal that multiway analog switch switching at runtime aforementioned excitation signal produces on human body and reference resistance is to signal amplification circuit; Signal amplification circuit is amplified in the response simulation voltage signal that human body under aforementioned excitation signal function or reference resistance produce; The input of the outfan access analog to digital conversion circuit of signal amplification circuit, analog to digital conversion circuit carries out digitized to the aforementioned response simulation voltage signal sampled, and is converted to digital signal; The human body impedance value under square-wave signal excitation of aforementioned one-tenth odd-multiple has been tested, and can carry out the impedance computation of each frequency.
Producing multifrequency sine signal and usually have analog-and digital-two kinds, is that the analogue signal oscillating circuit of representative has structure simply, the advantage that distorted signals is little, but frequency with Wien bridge circuit, amplitude adjusted difficulty.Then because circuit is complicated, cost is higher for the digital signal generator being representative with DDS (direct digital synthesizers).This utility model aforementioned circuit utilizes method square-wave signal being expanded into Fourier space, can realize measuring the human body impedance of any number of frequency.
According to embodiment, a kind of fat scale that this utility model provides, comprise weighing tray, the bottom of described weighing tray is provided with pressure transducer, the contact surface of described weighing tray and human body sole is provided with metal electrode film, its innovative point is, described pressure transducer is connected with inner MCU microprocessor with aforementioned multifrequency point human body impedance measuring circuit respectively by signal processing circuit with metal electrode film.
According to an embodiment, in the aforementioned fat scale of this utility model, signal processing circuit comprises: the signal amplification unit of the processing and amplifying that is connected with pressure transducer, carried out by the voltage signal that pressure transducer exports; And be connected between signal amplification unit and MCU microprocessor, the voltage signal that signal amplification unit exports is carried out the AD conversion unit of AD conversion.
Relative to prior art, because human body is different to the response of different frequency signals, by this utility model aforementioned multifrequency point human body impedance measuring circuit and fat scale, by the measurement to human body impedance under multiple frequency, more accurate and comprehensive Human Physiology and pathological parameter can be obtained, from pertinent literature (Bioelectrical impedance analysis (BIA) measures human body component (super generation is appointed in Huanghai Sea shore) foreign medical science biomedical engineering fascicle the 23rd volume the 3rd phase in 2000), the impedance damping H recorded under 5kHz
2/ R and ECW (extracellular fluid) significant correlation (r=0.86), and the impedance damping H recorded under 100KHz
2/ R and TBW (total water) significant correlation (r=0.89).This utility model utilizes method square-wave signal being expanded into Fourier space, proposes a kind of circuit simple, can realize measuring the impedance of any number of frequency.
In this utility model aforementioned multifrequency point human body impedance measuring circuit and fat scale, the signal frequency that square wave signal generator produces is not limited to 50KHz, but comprises 5KHz, 15KHz, 25KHz, 35KHz, 45KHz, 55KHz, the square-wave signal of 65KHz, 75KHz, 85KHz, 95KHz; What connect after square wave signal generator is low-pass filter circuit, instead of bandwidth-limited circuit, thus be added in human body is a harmonic signal.
Accompanying drawing explanation
Fig. 1 carries out the circuit structure block diagram of multifrequency point human body impedance measuring according to the square-wave signal that utilizes of this utility model embodiment.
Detailed description of the invention
Below in conjunction with the drawings and specific embodiments, set forth this utility model further.These embodiments are interpreted as only being not used in restriction protection domain of the present utility model for illustration of this utility model.After the content of having read this utility model record, those skilled in the art can make various changes or modifications this utility model, and these equivalence changes and modification fall into this utility model claim limited range equally.
Fig. 1 is that the square-wave signal that utilizes of this utility model preferred embodiment carries out the circuit structure block diagram of multifrequency point human body impedance measuring, as shown in the figure, this utilizes square-wave signal to carry out the circuit of multifrequency point human body impedance measuring, comprise signal generator, voltage-controlled current source, multiway analog switch, signal amplification circuit, analog to digital conversion circuit and analog to digital conversion circuit, wherein:
Signal generator is made up of square wave signal generator and low-pass filter circuit, and its effect produces multiple harmonic voltage signal; The function of square wave signal generator produces first-harmonic and odd square-wave signal doubly thereof, and most MCU single-chip microcomputer all possesses this function; The effect of second-order low-pass filter circuit is the high order target signal filter being included in square wave, retains the frequency content needed for each frequency.
The effect of VCCS (voltage-controlled current source) is current source signal voltage signal being converted to 1mA amplitude, as the pumping signal applied human body;
The effect of multiway analog switch be operationally the voltage signal that produces on human body and reference resistance of switching at runtime pumping signal to signal amplification circuit;
The effect of signal sampling amplifying circuit is amplified in the response voltage signal that human body under pumping signal effect or reference resistance produce;
The effect of analog digital conversion (ADC) circuit carries out digitized to the analogue signal sampled, and transfers digital signal to;
Frequency impedance computation: the human body impedance value under square-wave signal (through the low-pass filtering) excitation of each one-tenth odd-multiple can carry out the impedance computation of each frequency after having tested according to following mathematical principle.
From mathematical principle, square-wave signal is deployable is Fourier space, as follows:
If f (nwt) is an amplitude is 1, the cycle is the square-wave signal (n=1,3,5,7) of 2 π/(nw), then deployable is Fourier space,
f(wt)＝4/π[sinwt+1/3sin(3wt)+1/5sin(5wt)+1/7sin(7wt)+1/9(sin9wt)+···] (1)
f(3wt)＝4/π[sin3wt+1/3sin(9wt)+1/5sin(15wt)+1/7sin(21wt)++···] (2)
f(5wt)＝4/π[sin5wt+1/3sin(15wt)+1/5sin(25wt)+1/7sin(35wt)++···] (3)
f(7wt)＝4/π[sin7wt+1/3sin(21wt)+1/5sin(35wt)+1/7sin(49wt)++···] (4)
By above-mentioned square-wave signal after a cut-off frequency is the ideal low-pass filter of sin9wt, variously to can be changed into above
f
1(wt)＝4/π[sinwt+1/3sin(3wt)+1/5sin(5wt)+1/7sin(7wt)] (1’)
f
2(3wt)＝4/π[sin3wt] (2’)
f
3(5wt)＝4/π[sin5wt] (3’)
f
4(7wt)＝4/π[sin7wt] (4’)
By various above, the sinusoidal signal of sinwt can be drawn through mathematical calculation, as follows:
f
1(wt)-1/3*f
2(3wt)-1/5*f
3(5wt)-1/7*f
4(7wt)＝4/π*sinwt (5)
By the aforementioned circuit utilizing square-wave signal to carry out multifrequency point human body impedance measuring of the present embodiment, human body impedance value under square-wave signal (through the low-pass filtering) excitation of each one-tenth odd-multiple can carry out the impedance computation of each frequency after having tested according to aforementioned mathematical principle.
Below calculate 5KHz, 15KHz, 25KHz, 35KHz, 45KHz, 55KHz, 65KHz, 75KHz, the human body impedance of frequency.
(1) cut-off frequency arranging low pass filter is 100KHz.
(2) utilize square wave signal generator to produce the square-wave signal of 5KHz, 15KHz, 25KHz, 35KHz, 45KHz, 55KHz, 65KHz, 75KHz, 85KHz, 95KHz, after the low pass filter filtering that cut-off frequency is 100KHz, above-mentioned signal approximation is:
V
1(t)＝4/π*[sin(2*pi*5k*t)+1/3*sin(2*pi*15k*t)+1/5*sin(2*pi*25k*t)+1/7*sin(2*pi*35k*t)+1/9*sin(2*pi*45k*t)+1/11*sin(2*pi*55k*t)+1/13*sin(2*pi*65k*t)+1/15*sin(2*pi1/17*sin(2*pi*75*t)+1/19*sin(2*pi*95*t)]；
V
2(t)＝4/π*[sin(2*pi*15k*t)+1/3*sin(2*pi*45k*t)+1/5*sin(2*pi*75k*t)]；
V
3(t)＝4/π*[sin(2*pi*25k*t)+1/3*sin(2*pi*75k*t)]；
V
4(t)＝4/π*sin(2*pi*35k*t)；
V
5(t)＝4/π*sin(2*pi*45k*t)；
V
6(t)＝4/π*sin(2*pi*55k*t)；
V
7(t)＝4/π*sin(2*pi*65k*t)；
V
8(t)＝4/π*sin(2*pi*75k*t)；
V
9(t)＝4/π*sin(2*pi*85k*t)；
V
10(t)＝4/π*sin(2*pi*95k*t)；
(3) above-mentioned voltage signal is after VCCS, all changes the current signal that amplitude is about 1mA into.
I
1(t)＝sin(2*pi*5k*t)+1/3*sin(2*pi*15k*t)+1/5*sin(2*pi*25k*t)+1/7*sin(2*pi*35k*t)+1/9*sin(2*pi*45k*t)+1/11*sin(2*pi*55k*t)+1/13*sin(2*pi*65k*t)+1/15*sin(2*pi1/17*sin(2*pi*75*t)+1/19*sin(2*pi*95*t)；
I
2(t)＝sin(2*pi*15k*t)+1/3*sin(2*pi*45k*t)+1/5*sin(2*pi*75k*t)；
I
3(t)＝sin(2*pi*25k*t)+1/3*sin(2*pi*75k*t)；
I
4(t)＝sin(2*pi*35k*t)；
I
5(t)＝sin(2*pi*45k*t)；
I
6(t)＝sin(2*pi*55k*t)；
I
7(t)＝sin(2*pi*65k*t)；
I
8(t)＝sin(2*pi*75k*t)；
I
9(t)＝sin(2*pi*85k*t)；
I
10(t)＝sin(2*pi*95k*t)；
(4) respective impedance of each frequency of human body is established to be respectively Z
5KHZ, Z
15KHZ, Z
25KHZ, Z
35KHZ, Z
45KHZ, Z
55KHZ, Z
65KHZ, Z
75KHZ, Z
855KHZ, Z
95KHZ; Impedance under above-mentioned each pumping signal effect is respectively Z
1, Z
2, Z
3, Z
4, Z
5, Z
6, Z
7, Z
8, Z
9, Z
10, above-mentioned electric current, after human body, has following equation:
I
1*Z
1＝I
5KHZ*Z
5KHZ+1/3*I
15KHZ*Z
15KHZ+1/5*I
25KHZ*Z
25KHZ+1/7*I
35KHZ*Z
35KHZ+1/9*I
45KHZ*Z
45KHZ+1/11*I
55KHZ*Z
55KHZ+1/13*I
65KHZ*Z
65KHZ+1/15*I
75KHZ*Z
75KHZ+1/17*I
85KHZ*Z
85KH Z+1/19*I
95KHZ*Z
95KHZ
Can sinusoidal current signal be regarded as on the right of above formula:
sin(2*pi*5k*t),sin(2*pi*15k*t),sin(2*pi*25k*t),sin(2*pi*35k*t),
sin(2*pi*45k*t),sin(2*pi*55k*t),sin(2*pi*65k*t),sin(2*pi*75k*t),
sin(2*pi*95k*t)
Respectively to Z
5KHZ, 1/3*Z
15KHZ, 1/5*Z
25KHZ, 1/7*Z
35KHZ, 1/9*Z
45KHZ, 1/11*Z
55KHZ, 1/13*Z
65KHZ, 1/15*Z
75KHZ, 1/17*Z
855KHZ, 1/19*Z
95KHZthe cumulative sum of the voltage that hindrance function produces is similar below.
I
2*Z
2＝I
15KHZ*Z
15KHZ+1/3*I
45KHZ*Z
45KHZ+1/5*I
75KHZ*Z
75KHZ；
I3*Z
3＝I
25KHZ*Z
25KHZ+1/3*I
75KHZ*Z
75KHZ；
I
4*Z
4＝I
35KHZ*Z
35KHZ；
I
5*Z
5＝I
45KHZ*Z
45KHZ；
I
6*Z
6＝I
55KHZ*Z
55KHZ；
I
7*Z
7＝I
65KHZ*Z
65KHZ；
I
8*Z
8＝I
75KHZ*Z
75KHZ；
I
9*Z
9＝I
85KHZ*Z
85KHZ；
I
5*Z
10＝I
45KHZ*Z
95KHZ；
(5) obtain by matching type the impedance Z 1, Z2, Z3, Z4, Z5, Z6, Z7, Z8, Z9, Z10 that each square wave (through low-pass filtering) encourages.
(6) impedance of each frequency is obtained with following formula.
Z
95KHZ＝Z
10；
Z
85KHZ＝Z
9；
Z
75KHZ＝Z
8；
Z
65KHZ＝Z
7；
Z
55KHZ＝Z
6；
Z
45KHZ＝Z
5；
Z
35KHZ＝Z
4；
Z
25KHZ＝Z
3–1/3*Z
35KHZ；
Z
15KHZ＝Z
2–1/3*Z
45KHZ–1/5*Z
75KHZ；
Z
5KHZ＝Z
1–1/3*Z
15KHZ–1/5*Z
25KHZ–1/7*Z
35KHZ–1/9*Z
45KHZ–1/11*Z
55KHZ–1/13*Z
65KHZ–1/15*Z
75KHZ–1/17*Z
85KHZ–1/19*Z
95KHZ。
The fat scale that this utility model preferred embodiment provides, comprise weighing tray, the bottom of weighing tray is provided with pressure transducer, the contact surface of weighing tray and human body sole is provided with metal electrode film, and described pressure transducer is connected with inner MCU microprocessor with aforementioned multifrequency point human body impedance measuring circuit respectively by signal processing circuit with metal electrode film.Signal processing circuit comprises: the signal amplification unit of the processing and amplifying that is connected with pressure transducer, carried out by the voltage signal that pressure transducer exports; And be connected between signal amplification unit and MCU microprocessor, the voltage signal that signal amplification unit exports is carried out the AD conversion unit of AD conversion.
Claims (3)
1. the circuit utilizing square-wave signal to carry out multifrequency point human body impedance measuring, it is characterized in that, comprise signal generator, voltage-controlled current source, multiway analog switch, signal amplification circuit, analog to digital conversion circuit and analog to digital conversion circuit, signal generator is made up of square wave signal generator and second-order low-pass filter circuit, produces multiple harmonic voltage signal; The input of the outfan access voltage-controlled current source of signal generator, harmonic voltage signal is converted to the current source signal of 1mA amplitude by voltage-controlled current source, as the pumping signal applied human body; The voltage signal that multiway analog switch switching at runtime aforementioned excitation signal produces on human body and reference resistance is to signal amplification circuit; Signal amplification circuit is amplified in the response simulation voltage signal that human body under aforementioned excitation signal function or reference resistance produce; The input of the outfan access analog to digital conversion circuit of signal amplification circuit, analog to digital conversion circuit carries out digitized to the aforementioned response simulation voltage signal sampled, and is converted to digital signal; The human body impedance value under square-wave signal excitation of aforementioned one-tenth odd-multiple has been tested, and can carry out the impedance computation of each frequency.
2. a fat scale, comprise weighing tray, the bottom of described weighing tray is provided with pressure transducer, the contact surface of described weighing tray and human body sole is provided with metal electrode film, it is characterized in that, described pressure transducer is connected with inner MCU microprocessor with impedance measuring circuit according to claim 1 respectively by signal processing circuit with metal electrode film.
3. fat scale according to claim 2, is characterized in that, signal processing circuit comprises: the signal amplification unit of the processing and amplifying that is connected with pressure transducer, carried out by the voltage signal that pressure transducer exports; And be connected between signal amplification unit and MCU microprocessor, the voltage signal that signal amplification unit exports is carried out the AD conversion unit of AD conversion.
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN106896279A (en) * | 2015-12-21 | 2017-06-27 | 施耐德电气美国股份有限公司 | Dynamic digital input filter |
| CN107157481A (en) * | 2017-05-10 | 2017-09-15 | 湖南海翼电子商务股份有限公司 | Measure circuit, method and the bodily fat measurement device of human body resistance |
| CN107543600A (en) * | 2016-06-23 | 2018-01-05 | 上海北京大学微电子研究院 | Electronic scale with fat-measuring function |
| CN109561836A (en) * | 2016-08-10 | 2019-04-02 | 高通股份有限公司 | Bio-impedance testing system calibration |
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- 2014-09-17 CN CN201420535411.6U patent/CN204072092U/en not_active Expired - Fee Related
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106896279A (en) * | 2015-12-21 | 2017-06-27 | 施耐德电气美国股份有限公司 | Dynamic digital input filter |
| CN106896279B (en) * | 2015-12-21 | 2021-05-04 | 施耐德电气美国股份有限公司 | Dynamic digital input filtering |
| CN107543600A (en) * | 2016-06-23 | 2018-01-05 | 上海北京大学微电子研究院 | Electronic scale with fat-measuring function |
| CN109561836A (en) * | 2016-08-10 | 2019-04-02 | 高通股份有限公司 | Bio-impedance testing system calibration |
| CN109561836B (en) * | 2016-08-10 | 2021-11-12 | 飞利浦医疗信息股份有限公司 | Bio-impedance measurement system calibration |
| CN107157481A (en) * | 2017-05-10 | 2017-09-15 | 湖南海翼电子商务股份有限公司 | Measure circuit, method and the bodily fat measurement device of human body resistance |
| CN107157481B (en) * | 2017-05-10 | 2020-09-15 | 安克创新科技股份有限公司 | Circuit and method for measuring human body resistance and body fat measuring device |
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Address after: 201613 Shanghai city Songjiang District Kunshan small town Guangfulin road 4855 lane and large territory 25 5 storey block industry Patentee after: Shanghai Wei Si Leya Health Science and Technology Co Ltd Address before: 201613 Shanghai city Songjiang District Kunshan small town Guangfulin road 4855 lane and large territory 25 5 storey block industry Patentee before: Shanghai Weile Yasi Product Design Co., Ltd. |
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