CN107157481A - Measure circuit, method and the bodily fat measurement device of human body resistance - Google Patents
Measure circuit, method and the bodily fat measurement device of human body resistance Download PDFInfo
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- CN107157481A CN107157481A CN201710326062.5A CN201710326062A CN107157481A CN 107157481 A CN107157481 A CN 107157481A CN 201710326062 A CN201710326062 A CN 201710326062A CN 107157481 A CN107157481 A CN 107157481A
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B5/00—Measuring for diagnostic purposes; Identification of persons
- A61B5/05—Detecting, measuring or recording for diagnosis by means of electric currents or magnetic fields; Measuring using microwaves or radio waves
- A61B5/053—Measuring electrical impedance or conductance of a portion of the body
- A61B5/0537—Measuring body composition by impedance, e.g. tissue hydration or fat content
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B5/00—Measuring for diagnostic purposes; Identification of persons
- A61B5/48—Other medical applications
- A61B5/4869—Determining body composition
- A61B5/4872—Body fat
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Abstract
The present invention relates to a kind of circuit, device and method for measuring human body resistance.The circuit；The startup control unit, for starting or closing the microcontroller；The microcontroller, after unlatching, sends at least two detection pulse signals in predeterminated frequency scope or default pulse duration range to the sample circuit；And all sample rate currents fed back according to the sample circuit determine human body resistance；The pulse detection signals of different frequency after human body for the pulse detection signals to be imported into human body, and are sampled by the sample circuit, feed back the sample rate current to the microcontroller.
Description
【Technical field】
Surveyed the present invention relates to electronic technology field, more particularly to a kind of circuit for measuring human body resistance, method and body fat
Measure device.
【Background technology】
With the improvement of living standards and medical detection level progress, generating a kind of is used to measure human body resistance
Equipment.The equipment judges human body component content by the detection to human body resistance and corresponding formula, such as：Fat content, egg
The composition parameters such as white matter content, Lean mass, basal metabolic rate.People can do one according to the human body component to health status
Individual simple judgement or prediction, so that prevention disease.
But, the existing detection device overwhelming majority is that double-conducting-piece or double conducting probe modes are contacted with human body,
This method or apparatus detected using single, fixed frequency pulse or DC current to human body resistance, very big
It is serious by external interference in degree, such as air humidity, foot bottom dry and wet degree, conducting strip or conducting probe degree of oxidation factor
Measurement measurement will be caused inaccurate.
【The content of the invention】
The technical problem to be solved in the present invention is circuit, the method that a kind of measurement result more accurately measures human body resistance
And bodily fat measurement device.
In order to solve the above technical problems, the present invention provides following technical scheme：
On the one hand, the present invention provides a kind of circuit for measuring human body resistance, and it includes：Startup control unit, microcontroller,
Sample circuit；The startup control unit, for starting or closing the microcontroller；The microcontroller, for after unlatching, sending
At least two detection pulse signals in predeterminated frequency scope or default pulse duration range give the sample circuit；And according to sampling electricity
All sample rate currents of road feedback, which are calculated, obtains human body resistance；The sample circuit, for the pulse detection signals to be imported
Human body, and the pulse detection signals of the different frequency after human body are sampled, feed back all sample rate currents
Give the microcontroller.
On the other hand, the present invention provides a kind of bodily fat measurement device, and it is included in any one above-mentioned embodiment
Measurement human body resistance circuit.
On the other hand, the present invention provides a kind of method for measuring human body resistance, and it includes：Step 100, predeterminated frequency is sent
At least two pulse detection signals in scope or default pulse duration range are to human body；Step 200, to the different frequencies after human body
The pulse detection signals of rate are sampled, and obtain the sample rate current of different frequency；Step 300, according to all sampling electricity
Stream calculation obtains human body resistance.
The beneficial effects of the present invention are：The body embodiment that the present invention has is by the way of frequency scanning or pulse scanning
Human body resistance is measured respectively, obtaining multiple sample rate currents by different alternating-current detection signals calculates human body resistance, thus
Remove or reduce error or influence that extraneous factor is brought so that calculate measurement result and more stablize, accurately.
【Brief description of the drawings】
Fig. 1 is a kind of circuit theory diagrams for the circuit for measuring human body resistance of the specific embodiment of the invention one.
Fig. 2 is a kind of circuit theory diagrams for the circuit for measuring human body resistance of the specific embodiment of the invention two.
Fig. 3 is human body equivalent resistance schematic diagram in the specific embodiment of the invention two.
Fig. 4 is the circuit theory diagrams of change-over circuit in the specific embodiment of the invention two.
The curve map that Fig. 5 changes for human body resistance in the specific embodiment of the invention two with frequency.
Fig. 6 is curve map of the human body resistance in the specific embodiment of the invention two with pulse width variations.
Fig. 7 is a kind of flow chart for the method for measuring human body resistance of the specific embodiment of the invention three.
Fig. 8 is a kind of flow chart for the method for measuring human body resistance of the specific embodiment of the invention four.
Fig. 9 is a kind of flow chart for the method for measuring human body resistance of the specific embodiment of the invention five.
Reference：
【Embodiment】
In order to make the purpose , technical scheme and advantage of the present invention be clearer, it is right below in conjunction with drawings and Examples
The present invention is further elaborated.It should be appreciated that specific embodiment described herein is only to explain the present invention, not
For limiting the present invention.
As long as in addition, technical characteristic involved in each embodiment of invention described below is each other not
Constituting conflict can just be mutually combined.
Refer to Fig. 1, a kind of circuit theory diagrams of the embodiment one for the circuit for measuring human body resistance of the present invention.
The circuit of the measurement human body resistance includes：Microcontroller 100, circuit sampling circuit 200 and startup control unit
300。
The startup control unit 300, for starting or closing the microcontroller 100.Specifically, the startup control unit
100 can be key switch K1 or sensor, such as gravity sensor or infrared sensor, as long as it can touch
The component that hair microcontroller 100 is opened and closed can.
The microcontroller 100, for after unlatching, sending at least two in predeterminated frequency scope or default pulse duration range
Detect pulse signal to the sample circuit；And all sample rate currents fed back according to the sample circuit calculate and obtain human body resistance
Value.The calculation can be that first each sample rate current is averaged, and then be hindered according to the mean value calculation human body of current value
Value；Or initial human body resistance is first calculated according to each sample rate current, then the human body resistance initial to this removes average, obtains
Obtain more accurate human body resistance.Optimization, the average value for weighted average.
The sample circuit 200, for the pulse detection signals to be imported into human body, and to the different frequency after human body
The pulse detection signals are sampled, and feed back all sample rate currents to the microcontroller 100.
Continuing with referring to Fig. 2, a kind of circuit theory of the embodiment two for the circuit for measuring human body resistance of the present invention
Figure.It is with the difference of embodiment one：
The sample circuit includes 200：Switching circuit 40, at least two pulse input end A and C, at least two pulses output
Hold B and D, the first measurement detection branch 60 of branch road 50 and second.Specifically, pulse input end A and C, and the pulse are defeated
Go out to hold B and D, electrode slice can be used.
The microcontroller 100, for receive the startup control unit open signal after, send detection pulse signal to
The switching circuit 40；And after the detection pulse signal detection inputted by pulse input end A is complete, send switching control
Signal is to switching circuit.Specifically, the detection pulse is the form of square wave；Optimization, the detection pulse signal frequency exists
Between 10KHz--750KHz；The microcontroller 100 can be the microcontroller of 8 chips.The microcontroller 100 can be used
The microcontroller of the chip, such as model HT45F75 that are used in the product that current body fat claims.
The switching circuit 40, the switch-over control signal for being sent with the microcontroller 100 controls the detection pulse signal
Switch between different human contact's point A and C；After switching, then the detection pulse signal is entered by different pulse input ends
Enter after the human body, exported respectively from pulse output end B and D；
The first measurement branch road 50 and the second measurement branch road 60, are respectively used to the detection to pulse output end B and D
Pulse signal is sampled, and the first decay pulse signal second of acquisition is decayed into output of pulse signal to microcontroller respectively
100。
The microcontroller 100, is additionally operable to that the first decay pulse signal, the second decay pulse signal is compared and enlarged
After obtain all detection current values；And after the detection pulse signal detection inputted by pulse input end A is complete, send
Switch-over control signal is to switching circuit 40；And to being obtained according to same detection pulse signal via different pulse input end A and C
The detection current value obtained carries out comparison calibration and obtains comparison calibration value, and all comparison calibration values are weighted with average acquisition most
Whole current value；Calculated according to the final current value and obtain human body resistance value.Know to those skilled in the art as
How the current value according to obtained by measurement, which is calculated, obtains human body resistance value, does not repeat one by one herein.Optionally, be additionally operable to this first
Decay pulse signal, the second decay pulse signal obtain all data after being compared and enlarged；Electricity is obtained after being weighted averagely
Flow valuve；And after the detection pulse signal detection inputted by pulse input end A is complete, switch-over control signal is sent to cutting
Change circuit 40；And the final electric current of comparison calibration acquisition is carried out to the current value via different pulse input end A and C acquisitions
Value；Calculated according to the final current value and obtain human body resistance value.
In use, pulse input end A and C, and pulse output end B and D are electrically connected with human body to be measured.The microcontroller
After 100 start, detection pulse signal is sent to the switching circuit 40；The switching circuit 40 is defeated from pulse by the detection pulse signal
Enter to hold A to be directed respectively into the first measurement branch road 50 and double measurement branch road 60, the detection pulse signal enters after human body, due to people
Body exist capacitive reactance, impedance, capacitance-resistance admixture and decay (human body equivalent resistance as shown in Figure 3), first measurement branch road 50 with
And double measurement branch road 60 carries out sampling to the signal after the decay and forms first, second decay output of pulse signal to micro- respectively
Controller 100, the microcontroller 100 first, second decay pulse signal reads current value after being compared and enlarged.Wait to pass through
After the detection pulse signal detection of pulse input end A into first, second measurement branch road is complete, the microcontroller 100 is then sent out
Go out switch-over control signal to the switching circuit 40, the switching circuit 40 receives after the switch-over control signal, is switched to human body and connects
Contact C,.Then the pulse detection signals then enter the first measurement branch road 50 and double measurement branch road via human contact's point C
60, likewise, obtaining current value after above-mentioned detection process.And to the current value via different pulse input end acquisitions
Carry out comparison calibration and obtain final current value, calculated according to the final current value and obtain human body resistance value.The tool of the present invention
Body embodiment detected using two detection branch to human body resistance, with the testing results of two detection branch each other
Calibration is compared, so as to exclude the external factor, band such as the humidity of the oxidation because of electrode, air humidity and human contact face
The deviation for the measurement result come so that testing result is more accurate.
Specifically, the first measurement branch road 50 includes：First filter circuit 52 and the first follower 53.First filtering
The measurement pulse signal that 52 pairs of circuit is decayed after human body is filtered；First follower 53 is to filtered attenuation measurement
Pulse signal is sampled.
First filter circuit 52 includes resistance R1, R2, electric capacity C1 and diode D1；Optimization, diode D1 is
Two-way transient supression diode；Wherein, diode D1 is connected between electrode slice B and ground, and resistance R2 is connected to electrode slice B and
Between the output end of one filter circuit 52, resistance R1 and electric capacity C1 is connected in parallel in the output end and ground of the first filter circuit 52
Between.
First follower 53 includes operational amplifier A 2 and resistance R3, and the output end of first filter circuit 52 is connected to
The normal phase input end of the operational amplifier A 1, the negative-phase input of the operational amplifier A 1 is connected to the computing by resistance R3
Amplifier A1 output end, the output end of the operational amplifier A 1 is connected to the microcontroller 100.
Specifically, the second measurement branch road 60 includes：Second filter circuit 62 and the second follower 63.Second filtering
The measurement pulse signal that 62 pairs of circuit is decayed after human body is filtered；Second follower 63 is to filtered attenuation measurement
Pulse signal is sampled.
Second filter circuit 62 includes resistance R5, R6 and electric capacity C2；Wherein, resistance R6 is connected to electrode slice D and
Between the output end of two filter circuits 62, resistance R5 and electric capacity C2 is connected in parallel in the output end and ground of the second filter circuit 62
Between.
Second follower 63 includes operational amplifier A 2 and resistance R4, electric capacity C3, the output of second filter circuit 62
End is connected to the normal phase input end of the operational amplifier A 2, and the negative-phase input of the operational amplifier A 2 passes through resistance R3 connections
To the output end of the operational amplifier A 2, the output end of the operational amplifier A 2 is connected to the microcontroller 100.
As shown in figure 4, the inside of the switching circuit 40 is the empty on-off circuit of two-way p-type metal-oxide-semiconductor.Specifically, p-type MOS
Pipe Q1 and a triode Q2 constitute the on-off circuit powered to the first measurement branch road.Wherein, triode Q1 grid receives micro-
The clock control signal that controller 100 is sent, triode Q1 source electrode and drain electrode are connected between metal-oxide-semiconductor Q1 grid G and ground.
Metal-oxide-semiconductor Q1 source S receives the measurement pulse signal of microcontroller 100, drain D connection electrode piece A.Triode Q4 grid connects
The clock control signal that microcontroller 100 is sent is received, triode Q4 source electrode and drain electrode are connected to metal-oxide-semiconductor Q3 grid G and ground
Between.Metal-oxide-semiconductor Q4 source S receives the measurement pulse signal of microcontroller 100, drain D connection electrode piece C.
Clock control signal control triode Q2 or Q4 conducting and cut-off, and then control metal-oxide-semiconductor Q1 or Q3 pass respectively
Disconnected and cut-off.When metal-oxide-semiconductor Q1 conductings, metal-oxide-semiconductor Q3 cut-offs, the measurement pulse signal of microcontroller 100 is via metal-oxide-semiconductor Q1, electricity
Pole piece A enters human body；When metal-oxide-semiconductor Q1 conductings, metal-oxide-semiconductor Q1 cut-offs, the measurement pulse signal of microcontroller 100 is via metal-oxide-semiconductor
Q1, electrode slice C enter human body.
As shown in figure 5, for the present invention measurement human body resistance circuit embodiment two in, human body resistance is with frequency
The curve of change.
Optimization, the microcontroller 100, for sending at least two detection pulse signals in the range of a predeterminated frequency
The sample circuit is given, is specifically included：
The microcontroller 100, controls the pulsewidth amplitude of the detection pulse signal to keep constant, the frequency of the detection pulse signal
Rate is changed in the range of predeterminated frequency with a fixed step size, i.e. send the detection pulse signal by the way of frequency scanning.
Such as：Pulsewidth holding 50% is constant, and frequency is changed in 10KHz--750KHz frequency ranges with 0.4KHZ step-length, every time
Frequency increases 0.4KHZ.
Then, microcontroller 100 can obtain the curve that human body resistance changes with frequency, and all data measured are entered
Row weighted average obtains human body resistance.Detection human body resistance is scanned in a frequency range, different frequency can be obtained
The data of lower human body resistance, after being weighted averagely, the human body resistance of acquisition can be more accurate.
Further, in the curve changed from the human body resistance with frequency, screen and store accurate detection human body resistance institute
The accurate frequency measurement value scope needed：F1 to f2.In order to hereafter can in the range of the accurate frequency measurement value, using this frequency
The mode of rate scanning sends the detection pulse signal.The accurate frequency measurement value scope may have depositing for the microcontroller
In storage unit, in the storage device that is stored in microcontroller outside and can be read and write by the microcontroller, this is existing
Technology, is then repeated no more at this.
Specifically, such as filtering out f1 to f2 frequency bands pair by calculating the curvature (△ d) of the change curve raising and lowering
The human body resistance value interval answered is the optimum frequency section of test.Human body resistance is proceeded by from frequency for f1 pulse detection signals
Detection, then, the frequency of pulse detection signals increases 0.2KHz (i.e. f1 every time；f1+0.2；f1+0.4；f1+0.6；....f2)
Until frequency is f2, and pulsewidth keeps constant, such as 50%, then the data of acquisition are weighted and averagely obtain human body resistance.
A relatively small, more accurate scope is chosen from a larger scope, is performed a scan, can remove near
Like normal distribution curve in the more discrete data in two ends, obtain more accurate human body resistance.
Optimization, the microcontroller 100 is additionally operable in user since the user carries out second of measurement, only in the essence
Performed a scan in the range of true frequency values.The specific function can be by button, 100 hairs of triggering microcontroller
Send the detection pulse signal in precise frequency range；Can also recognize user by other existing identification methods, work as confirmation
When being same user, then the detection pulse signal that microcontroller 100 is sent in precise frequency range is triggered, herein not one by one
Repeat.When second of measurement body weight of same user, the frequency scanning in exact extension is directly carried out to it, is more beneficial for
Improve detection efficiency, it is to avoid when user weighs every time, be required for the long period.
As shown in fig. 6, for the present invention measurement human body resistance circuit embodiment two in, human body resistance is with pulsewidth
Change curve.
Optimization, the microcontroller 100, for sending at least two detection pulse signals in a default pulse duration range
The sample circuit is given, is specifically included：
The microcontroller 100, controls the frequency of the detection pulse signal to keep constant, the pulsewidth of the detection pulse signal exists
It is changed in default pulse duration range with a fixed step size, i.e. send the detection pulse signal by the way of pulsewidth scanning.Such as：
Frequency keeps constant, and pulsewidth changes in the range of 30%--70%, increases by 5% every time.Then, human body resistance is obtained with pulsewidth
Change curve；And all data obtained to detection are weighted and are averagely worth to human body resistance.In a pulse duration range
Detection human body resistance is scanned, the data of human body resistance under distinct pulse widths can be obtained, after being weighted averagely, the people of acquisition
Body resistance can be more accurate.
Further, from the human body resistance with pulse width variations curve map, screen and store user accurately detect human body hinder
The pulse duration range of accurate measurement needed for value.In order to hereafter in the pulse duration range that this is accurately measured, be scanned using the pulsewidth
Mode send the pulse detection signals.The pulse duration range accurately measured may have the memory cell of the microcontroller
In, in the storage device that is stored in microcontroller outside and can be read and write by the microcontroller, this is prior art,
This is then repeated no more.
Such as：Screened by the △ d curvature for calculating the curve raising and lowering, obtain d1 electric for optimal human body to d2 pulsewidths
Hinder the pulse duration range of measurement.D1 is to d2 pulse duration ranges within 30% to 70%.When the frequency of pulse detection signals is Fn, its
Pulse duration range changes successively in d1-d2 intervals, every time change, all obtains a corresponding human body resistance value.Then, it is to frequency
Fn pulse detection signals, are weighted in pulse duration range owner's bulk resistance that measurement is obtained in d1-d2 is interval and make even
, obtain measuring the accurate resistance Rn of the human body of acquisition under frequency Fn.One is chosen from a larger scope relatively
Less, more accurate pulse duration range, carry out pulsewidth scanning, can remove two ends in the curve of approximate normal distribution compare from
Scattered data, obtain more accurate human body resistance.
The specific embodiment of the invention one obtains human body resistance by the way of frequency scanning or pulsewidth scanning.Optimization,
Human body resistance can also be obtained by the way of frequency scanning and pulsewidth scanning simultaneously.That is, then obtained successively according to the above method
Frequency be respectively f1, f1+0.2, f1+0.4, f1+0.6 ... .f2, all pulse detections that pulsewidth changes between d1-d2 letter
Number corresponding accurate resistance R1 of human body, R2, R ... .Rn.Take again R1, R2, R3 ... .Rn average value, accurately measured
Human body resistance value.
Optimization, the microcontroller 100 is additionally operable in user since the user carries out second of measurement, only in the essence
Really performed a scan in measurement pulse duration range.The specific function can be by button, 100 transmissions of triggering microcontroller
Detection pulse signal in accurate pulse duration range；Can also recognize user by other existing identification methods, when confirmation is
During same user, then the detection pulse signal that microcontroller 100 is sent in accurate pulse duration range is triggered, is not gone to live in the household of one's in-laws on getting married one by one herein
State.When second of measurement body weight of same user, the pulsewidth scanning in exact extension is directly carried out to it, is more beneficial for carrying
High detection efficiency, it is to avoid when user weighs every time, is required for the long period.
It should be noted that the circuit for the measurement human body resistance that the invention embodiment one is provided can apply to respectively
In the electronic installation of class measurement human body resistance.
As shown in fig. 7, being a kind of flow chart for the method embodiment three for measuring human body resistance of the present invention.The measurement
The method of human body resistance includes：
Step 100, at least two pulse detection signals in predeterminated frequency scope or default pulse duration range are sent to human body；
Step 200, the pulse detection signals to the different frequency after human body are sampled, and obtain different frequency
Sample rate current；
Step 300, calculated according to all sample rate currents and obtain human body resistance.
The embodiment two of the present invention using it is in the range of predeterminated frequency or default pulse duration range in pulse inspection
Survey signal and carry out human body resistance detection, the detection data under multiple different impulsive conditions can be obtained, then under different condition
Measurement data calculates human body resistance, it is possible thereby to obtain more accurate measurement data.
Two detection branch is detected to human body resistance, is compared each other with the testing result of two detection branch
To calibration, so as to exclude the external factor, the survey brought such as the humidity of the oxidation because of electrode, air humidity and human contact face
Measure the deviation of result so that testing result is more accurate.
As shown in figure 8, being a kind of flow chart for the method embodiment four for measuring human body resistance of the present invention.With one kind
The difference for measuring the method embodiment one of human body resistance is：
The step 100, sends at least two pulse detection signals in predeterminated frequency scope or default pulse duration range to people
Body, is specifically included：
Step 110, the pulsewidth amplitude of the detection pulse signal is controlled to keep constant, the frequency of the detection pulse signal is pre-
If being changed in frequency range with a fixed step size, i.e. send the detection pulse signal by the way of frequency scanning.
Detection human body resistance is scanned in a frequency range, the number of human body resistance under different frequency can be obtained
According to after being weighted averagely, the human body resistance of acquisition can be more accurate.
Continuing with referring to Fig. 8, optimization, the step 100 is sent in predeterminated frequency scope or default pulse duration range at least
Two pulse detection signals specifically also include to human body：
Step 120, keep constant in the pulsewidth amplitude of the detection pulse signal, the frequency of the detection pulse signal is default
Under conditions of being changed in frequency range with a fixed step size, the curve that human body resistance changes with frequency is obtained, i.e. in default frequency
When being performed a scan in the range of rate, the curve that human body resistance changes with frequency is obtained；
Step 130, in the curve changed from the human body resistance with frequency, screen and store out accurate detection human body resistance institute
The accurate frequency measurement value scope needed.
A relatively small, more accurate scope is chosen from a larger scope, is performed a scan, can
The more discrete data in two ends in curve to remove approximate normal distribution, obtain more accurate human body resistance.
Optimize, the step 100, at least two pulse detection signals in predeterminated frequency scope or default pulse duration range are extremely
Human body, in addition to：
Step 140, only enter in user since the user carries out second of measurement in the range of the accurate frequency measurement value
Line frequency is scanned.
As shown in figure 9, being a kind of flow chart for the method embodiment five for measuring human body resistance of the present invention.With one kind
The difference for measuring the method embodiment three of human body resistance is：
The step 100, sends at least two pulse detection signals in predeterminated frequency scope or default pulse duration range to people
Body, specifically also includes：
Step 150, the frequency of the detection pulse signal is controlled to keep constant, the pulsewidth of the detection pulse signal is in default arteries and veins
It is changed in wide scope with a fixed step size, i.e. send the detection pulse signal by the way of pulsewidth scanning.
Detection human body resistance is scanned in a pulse duration range, the number of human body resistance under distinct pulse widths can be obtained
According to after being weighted averagely, the human body resistance of acquisition can be more accurate.
Continuing with referring to Fig. 9, optimization, the step 100 is sent in predeterminated frequency scope or default pulse duration range at least
Two pulse detection signals specifically also include to human body：
Step 160, keep constant in the frequency of the detection pulse signal, the pulsewidth of the detection pulse signal is in default pulsewidth
In the range of be changed with a fixed step size under conditions of, obtain human body resistance with pulse width variations curve map, i.e. in default pulsewidth model
When enclosing interior progress pulsewidth scanning, human body resistance is obtained with pulse width variations curve map；
Step 170, human body resistance is accurately detected from the human body resistance with pulse width variations curve map, screening and store user
The pulse duration range of required accurate measurement.
A relatively small, more accurate scope is chosen from a larger scope, is performed a scan, can
The more discrete data in two ends in curve to remove approximate normal distribution, obtain more accurate human body resistance.It is appreciated that
, in the embodiment of the present invention, pulse can be sent by the way of frequency scanning, it would however also be possible to employ pulsewidth is swept
The mode retouched launches pulse, it would however also be possible to employ frequency scanning and pulsewidth scan mode launch pulse.
Optimize, the step 100, at least two pulse detection signals in predeterminated frequency scope or default pulse duration range are extremely
Human body, in addition to：
Step 180, in user since the user carries out second of measurement, only enter in the range of the accurate measurement pwm value
Row pulsewidth is scanned.
One of ordinary skill in the art will appreciate that all or part of step in the various methods of embodiment is to lead to
Cross program to instruct the hardware of correlation to complete, the program can be stored in a computer-readable recording medium, storage medium
It can include：Read-only storage (ROM, Read Only Memory), random access memory (RAM, Random Access
Memory), disk or CD etc..The foregoing is merely illustrative of the preferred embodiments of the present invention, is not intended to limit the invention, all
Any modifications, equivalent substitutions and improvements made within the spirit and principles in the present invention etc., should be included in the guarantor of the present invention
Within the scope of shield.
Above-mentioned embodiment explanation but be not intended to limit the present invention, those skilled in the art can claim model
Designed in enclosing multiple instead of example.Those skilled in the art should be appreciated that to being violated no such as appended right
Defined in claim within the scope of the present invention, appropriate adjustment, modification etc. can be made to specific implementation.Therefore, it is all
According to the spirit and principles in the present invention, any modifications and variations done, of the invention defined in appended claims
Within the scope of.
Claims (16)
1. a kind of circuit for measuring human body resistance, it is characterised in that the circuit of the measurement human body resistance includes：Start control single
Member, microcontroller, and sample circuit；
The startup control unit, for starting or closing the microcontroller；
The microcontroller, for after unlatching, sending at least two detection arteries and veins in predeterminated frequency scope or default pulse duration range
Signal is rushed to the sample circuit；And all sample rate currents fed back according to the sample circuit determine human body resistance；
The sample circuit, for the pulse detection signals to be imported into human body, and to the pulse of the different frequency after human body
Detection signal is sampled, and feeds back the sample rate current to the microcontroller.
2. the circuit of human body resistance is measured as claimed in claim 1, it is characterised in that the sample circuit includes：Switching circuit,
At least two pulse input ends, at least two pulse output ends, the first measurement branch road and the second detection branch；
The microcontroller, the switching is given for after the open signal of the startup control unit is received, sending detection pulse signal
Circuit；And after the detection pulse signal detection inputted by one of them pulse input end is complete, send switching control
Signal is to switching circuit；
The switching circuit, the switch-over control signal for being sent according to the microcontroller control the detection pulse signal from another
The pulse input end enters after the human body, is exported respectively from the pulse output end；
The first measurement branch road and the second measurement branch road, are respectively used to the detection pulse signal to the pulse output end and carry out
Sampling, respectively by the first decay pulse signal of acquisition, the second decay output of pulse signal to microcontroller；
The microcontroller, is additionally operable to obtain after the first decay pulse signal, the second decay pulse signal is compared and enlarged
Take all detection current values；And the detection electricity to being obtained according to same detection pulse signal via the different pulse input ends
Flow valuve carries out comparison calibration, obtains comparison calibration value；All comparison calibration values are weighted with the final electric current of average acquisition
Value；And acquisition human body resistance value is calculated according to the final current value.
3. the circuit of human body resistance is measured as claimed in claim 1, it is characterised in that the microcontroller, for sending one
At least two detection pulse signals in predeterminated frequency scope or default pulse duration range give the sample circuit, specifically include：
The microcontroller, for controlling the pulsewidth amplitude of the detection pulse signal to keep constant, the frequency of the detection pulse signal
It is changed in the range of the predeterminated frequency with a fixed step size, i.e. in the range of the predeterminated frequency, by the way of frequency scanning
Send the detection pulse signal.
4. measuring the circuit of human body resistance as claimed in claim 3, it is characterised in that the microcontroller, it is additionally operable in the arteries and veins
Wide cut degree is kept under the conditions of the constant, frequency is changed in the range of predeterminated frequency with a fixed step size, obtain human body resistance with
Frequency variation curve；From the human body resistance with needed in frequency variation curve, screening and storing and accurately measure the human body resistance
Accurate frequency measurement value scope.
5. measuring the circuit of human body resistance as claimed in claim 4, it is characterised in that the microcontroller, it is additionally operable to from the use
Family carries out second of measurement and started, and is only performed a scan in the range of the accurate frequency measurement value.
6. the circuit of human body resistance is measured as claimed in claim 1, it is characterised in that the microcontroller, for sending one
At least two detection pulse signals in predeterminated frequency scope or default pulse duration range give the sample circuit, specifically also include：
The microcontroller, controls the frequency of the detection pulse signal to keep constant, the pulsewidth of the detection pulse signal is in default arteries and veins
It is changed in wide scope with a fixed step size, i.e. send the detection pulse signal by the way of pulsewidth scanning.
7. measuring the circuit of human body resistance as claimed in claim 6, it is characterised in that the microcontroller, the frequency is additionally operable to
Keep constant, under the conditions of the pulsewidth is changed in default pulse duration range with a fixed step size, obtains human body resistance and become with pulsewidth
Change curve；Accurate survey needed for the human body resistance is accurately measured from the human body resistance with pulse width variations curve, screening and store
Measure pwm value scope.
8. measuring the circuit of human body resistance as claimed in claim 7, it is characterised in that the microcontroller, it is additionally operable to from the use
Family carries out second of measurement and started, and only carries out pulsewidth scanning in the range of the accurate measurement pwm value.
9. a kind of bodily fat measurement device, it is characterised in that the bodily fat measurement device is included such as any one in claim 1 to 8
The circuit of described measurement human body resistance.
10. a kind of method for measuring human body resistance, it is characterised in that the method for the measurement human body resistance includes：
Step 100, at least two pulse detection signals in predeterminated frequency scope or default pulse duration range are sent to human body；
Step 200, the pulse detection signals to the different frequency after human body are sampled, and obtain the sampling of different frequency
Electric current；
Step 300, calculated according to all sample rate currents and obtain human body resistance.
11. measuring the method for human body resistance as claimed in claim 10, it is characterised in that the step 100, predeterminated frequency is sent
At least two pulse detection signals in scope or default pulse duration range to human body, including：
Step 110, the pulsewidth amplitude of the detection pulse signal is controlled to keep constant, the frequency of the detection pulse signal is in default frequency
It is changed in the range of rate with a fixed step size, i.e. send the detection pulse signal by the way of frequency scanning.
12. measuring the method for human body resistance as claimed in claim 11, it is characterised in that the step 100, predeterminated frequency is sent
At least two pulse detection signals in scope or default pulse duration range to human body, in addition to：
Step 120, keep constant in the pulsewidth amplitude of the detection pulse signal, the frequency of the detection pulse signal is in predeterminated frequency
In the range of be changed with a fixed step size under conditions of, obtain the curve that changes with frequency of human body resistance；
Step 130, in the curve changed from the human body resistance with frequency, screen and store the essence needed for accurate detection human body resistance
True frequency values scope.
13. the method for human body resistance is measured as claimed in claim 12, it is characterised in that the step 100, predeterminated frequency scope
Or at least two pulse detection signals in default pulse duration range are to human body, in addition to：
Step 140, only line frequency is entered in the range of the accurate frequency measurement value since the user carries out second of measurement in user
Rate is scanned.
14. the method for the measurement human body resistance as described in any one in claim 10 to 13, it is characterised in that the step
100, at least two pulse detection signals in predeterminated frequency scope or default pulse duration range are sent to human body, including：
Step 150, the frequency of the detection pulse signal is controlled to keep constant, the pulsewidth of the detection pulse signal is in default pulsewidth model
It is changed in enclosing with a fixed step size, i.e. send the detection pulse signal by the way of pulsewidth scanning.
15. measuring the method for human body resistance as claimed in claim 14, it is characterised in that the step 100, predeterminated frequency is sent
At least two pulse detection signals in scope or default pulse duration range to human body, in addition to：
Step 160, keep constant in the frequency of the detection pulse signal, the pulsewidth of the detection pulse signal is in default pulse duration range
It is interior be changed with a fixed step size under conditions of, obtain human body resistance with pulse width variations curve map；
Step 170, from the human body resistance with pulse width variations curve map, screening and store needed for user accurately detects human body resistance
Accurate measurement pulse duration range.
16. the method for human body resistance is measured as claimed in claim 15, it is characterised in that the step 100, predeterminated frequency scope
Or at least two pulse detection signals in default pulse duration range are to human body, in addition to：
Step 180, in user since the user carries out second of measurement, only arteries and veins is carried out in the range of the accurate measurement pwm value
Width scanning.
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| CN201710326062.5A CN107157481B (en) | 2017-05-10 | 2017-05-10 | Circuit and method for measuring human body resistance and body fat measuring device |
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