CN104083168B - A kind of survey fat circuit and Human fat balance - Google Patents
A kind of survey fat circuit and Human fat balance Download PDFInfo
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- 238000012360 testing method Methods 0.000 claims abstract description 96
- 238000005259 measurement Methods 0.000 claims abstract description 34
- 238000005070 sampling Methods 0.000 claims abstract description 14
- 230000003321 amplification Effects 0.000 claims description 5
- 238000003199 nucleic acid amplification method Methods 0.000 claims description 5
- 210000000577 adipose tissue Anatomy 0.000 description 6
- 210000000170 cell membrane Anatomy 0.000 description 6
- 210000004027 cell Anatomy 0.000 description 4
- 230000000694 effects Effects 0.000 description 4
- 238000000034 method Methods 0.000 description 4
- 210000001519 tissue Anatomy 0.000 description 4
- 230000006870 function Effects 0.000 description 3
- 230000037396 body weight Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 210000003722 extracellular fluid Anatomy 0.000 description 2
- 210000002977 intracellular fluid Anatomy 0.000 description 2
- 238000005303 weighing Methods 0.000 description 2
- 208000017667 Chronic Disease Diseases 0.000 description 1
- 206010020772 Hypertension Diseases 0.000 description 1
- 206010028980 Neoplasm Diseases 0.000 description 1
- 201000011510 cancer Diseases 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 206010012601 diabetes mellitus Diseases 0.000 description 1
- 235000013861 fat-free Nutrition 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 208000019622 heart disease Diseases 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 210000003205 muscle Anatomy 0.000 description 1
- 230000009897 systematic effect Effects 0.000 description 1
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Abstract
One of the present invention surveys fat circuit and Human fat balance, wherein be connected into series circuit successively by the first test resistance Rt, the second test resistance Rt ' and measurement electrode in resistance selection circuit, the alternating voltage that backward crossover current amplifier exports is added in the two ends of series circuit; Voltage sampling circuit successively gathers the voltage at the voltage at measurement electrode two ends, the voltage at the second test resistance Rt ' two ends, the first test resistance Rt and the second test resistance Rt ' two ends, and the voltage equation measured by three times can try to achieve the value of human body resistance Rb; In order to correct the equivalent offset because resistance error and amplifier error bring, the present invention is by introducing the equivalent offset of the mode indirect calculation test resistance of external testing resistance.Preserve in the memorizer of survey fat circuit after result of calculation to be drawn, in actual measurement, equivalent offset is substituted in the accounting equation of human body resistance Rb, the impact because equivalent offset produces can be eliminated, obtain the accurate measurements of human body resistance Rb.
Description
Technical field
The present invention relates to health control technical field, particularly one surveys fat circuit and Human fat balance.
Background technology
Along with living standard day by day improves, the attention degree of the public to physical condition is deepened gradually, and the hope understanding the physical sign parameters such as body weight, body fat rate of health is day by day urgent.Body fat rate refers to the ratio of body fat institute percentage of liveweight, and too high body fat rate easily causes hypertension, heart disease, diabetes and cancer chronic diseases, if can obtain body fat rate accurately, then can carry out personal health management targetedly on this basis.Thus being expanded to by the common weighing scale only possessing function of weighing and have bodily fat measurement function concurrently, has been the development trend of current intelligent human-body scale.
The measuring instrument in prior art with function for measuring fat mainly applies a DC signal by the galvanic electrode of skin joint between both hands or both feet, then measuring the voltage produced on the electrode by contacting with skin, obtaining human body impedance Z with this.The measuring principle of the method mainly according to the poorly conductive of the fatty tissue electric conductivity in human body than non-fat tissue (muscle), if the fat mass in body is high, the human body impedance Z of its body interior.According to height H, body weight W and the human body impedance Z of tester, calculate body density DB, its computing formula is as follows:
DB-A-k×W×Z/H
2
Wherein: A is constant, k is proportionality coefficient.
Then the computing formula of fat percentage is such as formula shown in lower:
Fat percentage=(4.57/DB-4.142) × 100
It can thus be appreciated that accurately measuring human body impedance Z is the key obtaining high-precision fat percentage.Because the moisture existed in organism is two kinds of forms, i.e. extracellular fluid and intracellular fluid, wherein extracellular fluid flows between cell membrane outer wall and Ink vessel transfusing, and intracellular fluid is wrapped within cell by cell membrane.When electric current flows through biological tissue, cell membrane is equivalent to electric capacity, and the inside and outside liquid of cell is equivalent to and likes your group.For whole biological tissue, the set of the cell that Ke Shiwei ignores, when low-frequency current flows through, due to the capacitive reactance effect of cell membrane, is equivalent to the capacitive reactance effect of countless Capacitance parallel connections to electric current, therefore cell membrane can be equivalent to a total capacitance.According to cole-cole model, when the electric current of high frequency puts on biological tissue, because the electrical impedance of fluid of inside and outside cell resists much larger than cell membrane capacitance, capacitive reactance effect can be ignored, only consider electrical impedance.
But because survey fat circuit of the prior art is when measuring human body impedance Z, adopt idealized model, namely the linearity error of resistance and amplifier is not considered, this makes to have comparatively big error between the human body impedance Z that records and actual value, and then making the fat percentage also serious distortion that calculates based on human body impedance Z, referential is poor.
Summary of the invention
The object of the invention is to the defect for prior art and deficiency, a kind of rear calibration steps by adopting precision high temperature to float little reference resistance and equivalent offset amount being provided, obtaining the survey fat circuit that can calculate accurate human body impedance measuring value; And use the Human fat balance of this survey fat circuit.
For achieving the above object, the technical solution used in the present invention is:
A kind of survey fat circuit, it is characterized in that: it comprises the oscillating circuit, backward crossover current amplifier, resistance selection circuit, voltage sampling circuit and the peak sample circuit that connect successively, the AC signal that wherein said oscillating circuit exports, after the amplification of described backward crossover current amplifier, forms the alternating voltage with certain waveform and frequency; In described resistance selection circuit, the first test resistance Rt, the second test resistance Rt ' and measurement electrode are connected into series circuit successively, and described alternating voltage is added in the two ends of described series circuit; Described voltage sampling circuit can gather the voltage at the voltage at measurement electrode two ends, the voltage at the second test resistance Rt ' two ends, the first test resistance Rt and the second test resistance Rt ' two ends, and described voltage is inputted described peak sample circuit; Described peak sample circuit exports the peak value of described voltage;
The electric current flowing through described series circuit is I, and the diode drop in described peak sample circuit is VD, and the step measuring the human body resistance Rb be added between described measurement electrode comprises:
1) test described first test resistance Rt and the second test resistance Rt ', obtain the first output voltage at the outfan of described peak sample circuit:
V1＝I×(Rt+Rt’)-VD(1)
2) test described second test resistance Rt ', obtain the second output voltage at the outfan of described peak sample circuit:
V2＝I×(Rt’)-VD(2)
3) test described human body resistance Rb, obtain the 3rd output voltage at the outfan of described peak sample circuit:
V3＝I×Rb-VD(3)
4) described human body resistance Rb can be calculated:
Rb＝Rt×K+(Rt+Rt’)(4)
Wherein, K=(V3-V1)/(V1-V2);
After considering the equivalent offset Δ R1 of described first test resistance Rt and the equivalent offset Δ R2 of the second test resistance Rt ', equation (4) becomes
Rb＝(Rt+ΔR1)×K+(Rt+Rt’)+ΔR2(5)
5) the first external testing resistance Rcal1=Rt+Rt ' is placed between described measurement electrode, and records the first test voltage Vc1 at the outfan of described peak sample circuit;
6) the second external testing resistance Rcal2=Rt ' is placed between described measurement electrode, and records the second test voltage Vc2 at the outfan of described peak sample circuit;
7) described first external testing resistance Rcal1, described second external testing resistance Rcal2, described first test voltage Vc1, described second test voltage Vc2 are substituted in equation (5), obtain:
ΔR1＝(Rt×(Vc1-Vc2))/(V1-V2)-Rt
ΔR2＝((Vc1-V1)/(Vc1-Vc2))×Rt
The value of the equivalent offset Δ R2 of the equivalent offset Δ R1 of described first test resistance Rt and the second test resistance Rt ' is stored, and substitutes into the exact numerical that can obtain human body resistance Rb in equation (5) when actual measurement human body resistance Rb.
Described oscillating circuit comprises the first resistance, the second resistance, the 3rd resistance, the 4th resistance, the first operational amplifier, the first electric capacity, the second electric capacity and the 3rd electric capacity; Described first resistance is connected between the first operational amplifier positive input terminal and outfan; Between the negative input end that described 4th resistance is connected to described first operational amplifier and outfan; Described second resistance becomes a series and parallel circuit with after the 3rd resistant series with described first Capacitance parallel connection, and described series and parallel circuit is connected between power supply and earth point, and described second resistance is connected the positive input terminal of described first operational amplifier with the mid point of the 3rd resistance; Between the negative input end that described second electric capacity is connected to described first operational amplifier and earth point; The outfan of described first operational amplifier connects the 5th resistance in described backward crossover current amplifier by described 3rd electric capacity.
Described backward crossover current amplifier comprises the 5th resistance, the 6th resistance, the 7th resistance, the 8th resistance, the 4th electric capacity, the 5th electric capacity and the second operational amplifier; Between the outfan that the parallel circuit formed after described 6th resistance and the 5th Capacitance parallel connection is connected to described second operational amplifier and negative input end; The outfan of described second operational amplifier connects the 5th resistance; Series circuit after described 7th resistance and the 8th resistant series is connected between power supply and earth point, and described 4th electric capacity and the 8th resistor coupled in parallel.
Described resistance selection circuit comprises the first test resistance, the second test resistance, a pair measurement electrode, and be connected in parallel on described first test resistance two ends the first switches set, be connected in parallel on the second switch group at described second test resistance two ends, be connected in parallel on the 3rd switches set at described measurement electrode two ends; Described first test resistance, the second test resistance, a pair measurement electrode are in parallel with described 5th electric capacity C5 again after connecting successively.
Described voltage sampling circuit comprises the 9th resistance, the tenth resistance, the 11 resistance, the 12 resistance, the 3rd operational amplifier and the 6th electric capacity; The positive input terminal of described 3rd operational amplifier connects the positive switch of described first switches set, second switch group and the 3rd switches set simultaneously, and the negative input end of described 3rd operational amplifier connects the negative switch of described first switches set, second switch group and the 3rd switches set simultaneously; The positive input terminal of described 3rd operational amplifier also connects the positive input terminal of the second operational amplifier by the 9th resistance, between the negative input end that described 12 resistance is connected to the 3rd operational amplifier and outfan; The outfan of described 3rd operational amplifier is connected to the positive pole of diode in peak sample circuit by the 6th electric capacity.
Described peak sample circuit comprises the 13 resistance, the 14 resistance, the 15 resistance, the 7th electric capacity and diode; Series circuit after wherein said 13 resistance and the 14 resistant series is connected between power supply and earth point, and described 13 resistance is connected the positive pole of diode with the mid point of the 14 resistance; Described 7th electric capacity is connected the negative pole of described diode with the parallel circuit one end after the 15 resistor coupled in parallel, the other end connects earth point; The negative pole of described diode is as the outfan of described survey fat circuit.
The frequency of described alternating voltage is 50KHZ.
The scope of described first test resistance Rt and the second test resistance is 300 Ω ~ 600 Ω.
A kind of Human fat balance, is characterized in that: described electronic scale comprises survey fat circuit as above.
Technique effect of the present invention is as follows:
One of the present invention surveys fat circuit, it is characterized in that: it comprises the oscillating circuit, backward crossover current amplifier, resistance selection circuit, voltage sampling circuit and the peak sample circuit that connect successively, wherein the AC signal of oscillating circuit output is after the amplification of backward crossover current amplifier, forms the alternating voltage with certain waveform and frequency; In resistance selection circuit, the first test resistance Rt, the second test resistance Rt ' and measurement electrode are connected into series circuit successively, and alternating voltage is added in the two ends of series circuit; Voltage sampling circuit can gather the voltage at the voltage at measurement electrode two ends, the voltage at the second test resistance Rt ' two ends, the first test resistance Rt and the second test resistance Rt ' two ends, and voltage is inputted peak sample circuit; The peak value of peak sample circuit output voltage; The voltage equation measured by three times can try to achieve the value of human body resistance Rb.
In order to correct the equivalent offset because resistance error and amplifier error bring, the present invention is by introducing the equivalent offset of the mode indirect calculation test resistance of external testing resistance.Preserve in the memorizer of survey fat circuit after result of calculation to be drawn, in actual measurement, equivalent offset is substituted in the accounting equation of human body resistance Rb, the impact because equivalent offset produces can be eliminated, obtain the accurate measurements of human body resistance Rb.
Accompanying drawing explanation
Fig. 1 is survey fat circuit structure block diagram of the present invention
Fig. 2 is survey fat circuit embodiments schematic diagram of the present invention
Detailed description of the invention
Below in conjunction with accompanying drawing, the present invention is further illustrated.
As shown in Figure 1, survey fat circuit of the present invention comprises oscillating circuit 1, backward crossover current amplifier 2, resistance selection circuit 3, voltage sampling circuit 4 and peak sample circuit 5.
Oscillating circuit 1, for exporting the AC signal of certain waveform and frequency, comprises the first resistance R1, the second resistance R2, the 3rd resistance R3, the 4th resistance R4, the first operational amplifier A 1, first electric capacity C1, the second electric capacity C2 and the 3rd electric capacity C3.First resistance R1 is connected between the first operational amplifier A 1 positive input terminal and outfan; Between the negative input end that 4th resistance R4 is connected to the first operational amplifier A 1 and outfan; Be unified into a series and parallel circuit with the first electric capacity C1 after second resistance R2 and the 3rd resistance R3 connect, and this series and parallel circuit is connected between power vd D and earth point, the second resistance R2 is connected the positive input terminal of the first operational amplifier A 1 with the mid point of the 3rd resistance R3; Between the negative input end that second electric capacity C2 is connected to the first operational amplifier A 1 and earth point; The outfan of the first operational amplifier A 1 connects the 5th resistance R5 in backward crossover current amplifier 2 by the 3rd electric capacity C3.Wherein the frequency of AC signal is 50KHZ.
Backward crossover current amplifier 2 amplifies for the AC signal exported oscillating circuit 1, comprises the 5th resistance R5, the 6th resistance R6, the 7th resistance R7, the 8th resistance R8, the 4th electric capacity C4, the 5th electric capacity C5 and the second operational amplifier A 2.Between the outfan that the parallel circuit that 6th resistance R6 and the 5th electric capacity C5 parallel connection are formed afterwards is connected to the second operational amplifier A 2 and negative input end; The outfan of the second operational amplifier A 2 connects the 5th resistance R5; Series circuit after 7th resistance R7 and the 8th resistance R8 connects is connected between power vd D and earth point, and the 4th electric capacity C4 is in parallel with the 8th resistance R8.The amplification of backward crossover current amplifier 2 is determined by the ratio of the 5th resistance R5 and the 6th resistance R6 substantially.
Resistance selection circuit 3 is for gating measured resistance, comprise the first test resistance Rt, the second test resistance Rt ', a pair measurement electrode, and be connected in parallel on the first test resistance Rt two ends the first switches set T1, be connected in parallel on the second switch group T2 at the second test resistance Rt ' two ends, be connected in parallel on the 3rd switches set T3 at measurement electrode two ends, and the scope of the first test resistance Rt and the second test resistance is 300 Ω ~ 600 Ω.First test resistance Rt, the second test resistance Rt ', a pair measurement electrode are in parallel with the 5th electric capacity C5 again after connecting successively.When measurement electrode is placed in health predetermined portion by user, be equivalent to human body resistance Rb to access in the series circuit at the first test resistance Rt, the second test resistance Rt ' place, then can select by opening and closing first switches set T1, second switch group T2 and the 3rd switches set T3 the voltage measuring which resistance two ends.
Voltage sampling circuit 4 under the prerequisite not changing measured resistance both end voltage waveform, can carry out voltage sample, comprises the 9th resistance R9, the tenth resistance R10, the 11 resistance R11, the 12 resistance R12, the 3rd operational amplifier A 3 and the 6th electric capacity C6.The positive input terminal of the 3rd operational amplifier A 3 connects the positive switch of the first switches set T1, second switch group T2 and the 3rd switches set T3 simultaneously, and the negative input end of the 3rd operational amplifier A 3 connects the negative switch of the first switches set T1, second switch group T2 and the 3rd switches set T3 simultaneously; The positive input terminal of the 3rd operational amplifier A 3 also connects the positive input terminal of the second operational amplifier A 2 by the 9th resistance R9, between the negative input end that the 12 resistance R12 is connected to the 3rd operational amplifier A 3 and outfan; The outfan of the 3rd operational amplifier A 3 is connected to the positive pole of diode D1 in peak sample circuit 5 by the 6th electric capacity C6.
The voltage peak that peak sample circuit 5 exports for gathering voltage sampling circuit 4, comprises the 13 resistance R13, the 14 resistance R14, the 15 resistance R15, the 7th electric capacity C7 and diode D1.Series circuit wherein after the 13 resistance R13 and the 14 resistance R14 series connection is connected between power vd D and earth point, and the 13 resistance R13 is connected the positive pole of diode D1 with the mid point of the 14 resistance R14; 7th electric capacity C7 is connected the negative pole of diode D1 with the parallel circuit one end after the 15 resistance R15 parallel connection, and the other end connects earth point; The negative pole of diode D1, as the outfan of whole survey fat circuit, outwards exports the crest voltage in the first test resistance Rt, the second test resistance Rt ', measurement electrode.
In general bodily fat measurement process, the method for testing human impedance uses idealized model, and namely do not consider resistance and linearity of amplifier error, suppose that the alternating current exported by oscillating circuit 1 is I, the amplification of circuit equivalent is A, and diode drop is VD.Its step comprises:
1) test the resistance of Rt+Rt ', obtain the first output voltage at the outfan surveying fat circuit:
V1＝I×(Rt+Rt’)×A-VD(1)
2) test the resistance of Rt ', obtain the second output voltage at the outfan surveying fat circuit:
V2＝I×(Rt’)×A-VD(2)
3) testing human resistance Rb, obtains the 3rd output voltage at the outfan surveying fat circuit
V3＝I×Rb×A-VD(3)
4) then human body resistance can be calculated based on by above formula:
Rb＝Rt×K+(Rt+Rt’)(4)
Wherein, K=(V3-V1)/(V1-V2).
Due to the discordance of amplifier device and electrical switch, resistance error during measurement and amplifier error can not be ignored completely, Rt and Rt+Rt ', after electrical switch and amplifier drive, there will be equivalent offset, become Rt+ Δ R1 and Rt+Rt '+Δ R2,
Then human body resistance Rb becomes Rb=(Rt+ Δ R1) × K+ (Rt+Rt ')+Δ R2 (5)
Can verify, this systematic error delta R1 and Δ R2 remains linear, so on the basis of above-mentioned survey fat circuit, increase memory module S1, and by the first external testing resistance Rcal1 and the second external testing resistance Rcal2, following hardware corrected step done to human body resistance Rb:
5) the first external testing resistance Rcal1=Rt+Rt ' is placed into Rb position, and records the first test voltage Vc1 at the outfan surveying fat circuit;
6) the second external testing resistance Rcal2=Rt ' is placed into Rb position again, and records the second test voltage Vc2 at the outfan surveying fat circuit;
7) Rcal1, Rcal2, Vc1, Vc2 are substituted in equation (5), obtain:
ΔR1＝(Rt×(Vc1-Vc2))/(V1-V2)-Rt
ΔR2＝((Vc1-V1)/(Vc1-Vc2))×Rt
By the value of Δ R1 and Δ R2 stored in memorizer S1, and substituting into the exact numerical that can obtain human body resistance Rb in equation (5) described in user's actual measurement during human body resistance Rb.
It should be pointed out that the above detailed description of the invention can make the invention of those skilled in the art's comprehend, but do not limit the present invention in any way creation.Therefore; although this description has been described in detail the invention with reference to drawings and Examples; but; those skilled in the art are to be understood that; still can modify to the invention or equivalent replacement; in a word, all do not depart from technical scheme and the improvement thereof of the spirit and scope of the invention, and it all should be encompassed in the middle of the protection domain of the invention patent.
Claims (9)
1. survey fat circuit for one kind, it is characterized in that: it comprises the oscillating circuit, backward crossover current amplifier, resistance selection circuit, voltage sampling circuit and the peak sample circuit that connect successively, the AC signal that wherein said oscillating circuit exports, after the amplification of described backward crossover current amplifier, forms the alternating voltage with certain waveform and frequency; In described resistance selection circuit, the first test resistance Rt, the second test resistance Rt' and measurement electrode are connected into series circuit successively, and described alternating voltage is added in the two ends of described series circuit; Described voltage sampling circuit can gather the voltage at the voltage at measurement electrode two ends, the voltage at the second test resistance Rt' two ends, the first test resistance Rt and the second test resistance Rt' two ends, and the voltage that described voltage sampling circuit collects is inputted described peak sample circuit; Described peak sample circuit exports the peak value of the voltage that described voltage sampling circuit collects;
The electric current flowing through described series circuit is I, and the diode drop in described peak sample circuit is VD, and the step measuring the human body resistance Rb be added between described measurement electrode comprises:
1) test described first test resistance Rt and the second test resistance Rt', obtain the first output voltage at the outfan of described peak sample circuit:
V1=I×(Rt+Rt')-VD（1）
2) test described second test resistance Rt', obtain the second output voltage at the outfan of described peak sample circuit:
V2=I×(Rt')-VD（2）
3) test described human body resistance Rb, obtain the 3rd output voltage at the outfan of described peak sample circuit:
V3=I×Rb-VD（3）
4) described human body resistance Rb can be calculated:
Rb=Rt×K+（Rt+Rt')（4）
Wherein, K=(V3-V1)/(V1-V2);
After considering the equivalent offset Δ R1 of described first test resistance Rt and the equivalent offset Δ R2 of the second test resistance Rt', equation (4) becomes
Rb=(Rt+ΔR1)×K+(Rt+Rt')+ΔR2（5）
5) the first external testing resistance Rcal1=Rt+Rt' is placed between described measurement electrode, and records the first test voltage Vc1 at the outfan of described peak sample circuit;
6) the second external testing resistance Rcal2=Rt' is placed between described measurement electrode, and records the second test voltage Vc2 at the outfan of described peak sample circuit;
7) described first external testing resistance Rcal1, described second external testing resistance Rcal2, described first test voltage Vc1, described second test voltage Vc2 are substituted in equation (5), obtain:
ΔR1=(Rt×(Vc1-Vc2))/(V1-V2)-Rt
ΔR2=((Vc1-V1)/(Vc1-Vc2))×Rt
The value of the equivalent offset Δ R2 of the equivalent offset Δ R1 of described first test resistance Rt and the second test resistance Rt' is stored, and substitutes into the exact numerical that can obtain human body resistance Rb in equation (5) when actual measurement human body resistance Rb.
2. a kind of survey fat circuit as claimed in claim 1, is characterized in that: described oscillating circuit comprises the first resistance, the second resistance, the 3rd resistance, the 4th resistance, the first operational amplifier, the first electric capacity, the second electric capacity and the 3rd electric capacity; Described first resistance is connected between the first operational amplifier positive input terminal and outfan; Between the negative input end that described 4th resistance is connected to described first operational amplifier and outfan; Described second resistance becomes a series and parallel circuit with after the 3rd resistant series with described first Capacitance parallel connection, and described series and parallel circuit is connected between power supply and earth point, and described second resistance is connected the positive input terminal of described first operational amplifier with the mid point of the 3rd resistance; Between the negative input end that described second electric capacity is connected to described first operational amplifier and earth point; The outfan of described first operational amplifier connects the 5th resistance in described backward crossover current amplifier by described 3rd electric capacity.
3. a kind of survey fat circuit as claimed in claim 1, is characterized in that: described backward crossover current amplifier comprises the 5th resistance, the 6th resistance, the 7th resistance, the 8th resistance, the 4th electric capacity, the 5th electric capacity and the second operational amplifier; Between the outfan that the parallel circuit formed after described 6th resistance and the 5th Capacitance parallel connection is connected to described second operational amplifier and negative input end; The outfan of described second operational amplifier connects the 5th resistance; Series circuit after described 7th resistance and the 8th resistant series is connected between power supply and earth point, and described 4th electric capacity and the 8th resistor coupled in parallel.
4. as claimed in claim 3 a kind of survey fat circuit, it is characterized in that: described resistance selection circuit also comprise be connected in parallel on described first test resistance two ends the first switches set, be connected in parallel on the second switch group at described second test resistance two ends, be connected in parallel on the 3rd switches set at described measurement electrode two ends; Described first test resistance, the second test resistance, a pair measurement electrode after connecting successively again with described 5th Capacitance parallel connection.
5. a kind of survey fat circuit as claimed in claim 4, is characterized in that: described voltage sampling circuit comprises the 9th resistance, the tenth resistance, the 11 resistance, the 12 resistance, the 3rd operational amplifier and the 6th electric capacity; The positive input terminal of described 3rd operational amplifier connects the positive switch of described first switches set, second switch group and the 3rd switches set simultaneously, and the negative input end of described 3rd operational amplifier connects the negative switch of described first switches set, second switch group and the 3rd switches set simultaneously; The positive input terminal of described 3rd operational amplifier also connects the positive input terminal of the second operational amplifier by the 9th resistance, between the negative input end that described 12 resistance is connected to the 3rd operational amplifier and outfan; The outfan of described 3rd operational amplifier is connected to the positive pole of diode in peak sample circuit by the 6th electric capacity.
6. a kind of survey fat circuit as claimed in claim 1, is characterized in that: described peak sample circuit comprises the 13 resistance, the 14 resistance, the 15 resistance, the 7th electric capacity and diode; Series circuit after wherein said 13 resistance and the 14 resistant series is connected between power supply and earth point, and described 13 resistance is connected the positive pole of diode with the mid point of the 14 resistance; Described 7th electric capacity is connected the negative pole of described diode with the parallel circuit one end after the 15 resistor coupled in parallel, the other end connects earth point; The negative pole of described diode is as the outfan of described survey fat circuit.
7. the one as described in one of claim 1 ~ 6 surveys fat circuit, it is characterized in that: the frequency of described alternating voltage is 50KHZ.
8. the one as described in one of claim 1 ~ 6 surveys fat circuit, it is characterized in that: the scope of described first test resistance Rt and the second test resistance is 300 Ω ~ 600 Ω.
9. a Human fat balance, is characterized in that: described Human fat balance comprises the survey fat circuit as described in one of claim 1 ~ 8.
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| CN108209873A (en) * | 2017-12-29 | 2018-06-29 | 深圳市宝康隆科技有限公司 | A kind of intelligence turntable |
| CN108649924A (en) * | 2018-05-11 | 2018-10-12 | 新华网股份有限公司 | Detection circuit, method and device for human body resistance and computer readable storage medium |
| CN109350008A (en) * | 2018-08-30 | 2019-02-19 | 缤刻普达（北京）科技有限责任公司 | The health management system arranged and its health control method of one kind and device, storage medium |
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| CN2156809Y (en) * | 1993-03-05 | 1994-02-23 | 中国人民解放军北京军区后勤部军事医学研究所 | Human body fat analyzer |
| JP3636825B2 (en) * | 1996-06-25 | 2005-04-06 | 積水化学工業株式会社 | Body fat measuring device |
| JP3734350B2 (en) * | 1997-10-17 | 2006-01-11 | 株式会社タニタ | Body fat meter and body weight scale with body fat meter |
| JP3098735B2 (en) * | 1998-03-05 | 2000-10-16 | 株式会社ミサキ | Separate fat meter |
| CN2480844Y (en) * | 2001-04-23 | 2002-03-06 | 深圳清华大学研究院 | Integral monitor instrument for human weight, fat content and moisture content |
| CN2529252Y (en) * | 2002-02-28 | 2003-01-01 | 陈智裕 | body fat scale |
| CN2659334Y (en) * | 2003-10-09 | 2004-12-01 | 联通控股有限公司 | Scale type human moisture and fat tester |
| JP2005237473A (en) * | 2004-02-24 | 2005-09-08 | Tanita Corp | Biometric device |
| CN204106008U (en) * | 2014-07-23 | 2015-01-21 | 缤刻普锐(北京)科技有限责任公司 | A kind of survey fat circuit and Human fat balance |
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2014
- 2014-07-23 CN CN201410351153.0A patent/CN104083168B/en active Active
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