CN2704830Y - Human body fat balances - Google Patents
Human body fat balances Download PDFInfo
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- CN2704830Y CN2704830Y CN 200320116498 CN200320116498U CN2704830Y CN 2704830 Y CN2704830 Y CN 2704830Y CN 200320116498 CN200320116498 CN 200320116498 CN 200320116498 U CN200320116498 U CN 200320116498U CN 2704830 Y CN2704830 Y CN 2704830Y
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- human body
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Abstract
The utility model discloses a human body fat balance, the technical problems which is to be solved is scientifically and accurately measuring the body weight and the fat rate of a human body. The cost is relatively low. The following technical schemes adopted are that the human body fat balance comprises a balance pan for weighing the body weight, and a weighing sensor connected with the balance pan. The output end of the weighing sensor is connected with the input end of a weighing signal processing circuit; the output end of the weighing signal processing circuit is connected with the first port of a microprocessor; two pedal electrodes are arranged on the balance pan; the pedal electrode is connected with the input end of the measuring circuit of a human body organism resistance, and the output end is connected with the third port of the microprocessor; the second port of the microprocessor is connected with a memory storage circuit, the fourth port of the microprocessor is connected with a display, and the I/O port of the microprocessor is connected with a keyboard. Compared with prior art, the measuring circuit of the human body organism resistance provides more scientific and accurate measuring method in order to understand the health nutrition condition of a human body in time.
Description
Technical field
The utility model relates to a kind of testing tool, particularly relates to a kind of comprehensive human test's instrument with human body body weight, human body body fat rate measurement function.
Background technology
The size of human weight and body fat rate has great importance for estimating human body obese degree, nutritional status and health condition.Up to now, have much for the metering system of human body weight, body fat rate, such as: use weighing scale and claim human body body weight, buttermeter to measure body fat rate, height and weight empirical algorithms, ultrasonic Method for Measuring, infrared rays survey method or the like.There is deficiency separately in the above-mentioned method that these much have been widely adopted, they or simple and easy inaccurate, or the technical sophistication cost is higher.
Summary of the invention
The purpose of this utility model is that a kind of body fat scale will be provided, and its technical matters that will solve is to measure human body body weight and body fat rate exactly than science, and cost is relatively low.
The utility model is by the following technical solutions: a kind of body fat scale, comprise the scale pan of weighing in, with the LOAD CELLS that connects with the scale pan, the output terminal of described LOAD CELLS is connected with the input end of weighing-up wave treatment circuit, the output terminal of weighing-up wave treatment circuit is connected with first port of microprocessor, the scale pan is provided with two foot-operated electrodes, foot-operated electrode is connected with the input end of human-body biological resistance metering circuit, its output terminal is connected with the 3rd port of microprocessor, second port of microprocessor is connected with the memory storage circuit, its the 4th port is connected with display, and its I/O port is connected with keyboard.
Human-body biological resistance metering circuit of the present utility model is linked in sequence by constant current source, voltage follower, differential amplifier, half-wave rectifier, wave filter, and voltage follower is connected with foot-operated electrode, and the signal of exporting from wave filter is passed to microprocessor.
Be connected with the precision resistance of adjusting the differential amplifier enlargement factor between two electrodes of differential amplifier of the present utility model.
The resistance of the precision resistance that connects between two electrodes of differential amplifier of the present utility model is 1000 ohm.
The utility model compared with prior art, the metering circuit of human-body biological resistance provides more science, measuring method more accurately, so that in time understand the health-nutrition situation of self.
Description of drawings
Fig. 1 is the utility model body fat scale metering system synoptic diagram.
Fig. 2 is that the utility model body fat scale embodiment connects block diagram.
Fig. 3 is the utility model body fat scale embodiment constant current source oscillogram.
Fig. 4 is the utility model examples measure human-body biological resistance circuit block diagram.
Fig. 5 is the utility model examples measure human-body biological resistance circuit debug process () figure.
Fig. 6 is the utility model examples measure human-body biological resistance circuit debug process (two) figure.
Fig. 7 is the graph of a relation of the utility model examples measure human-body biological resistance circuit output voltage signal and the impedance of human-body biological resistance.
Embodiment
Below in conjunction with drawings and Examples the utility model is described in further detail.As shown in Figure 1, body fat scale is placed on the ground, at first imports tested user's sex, age, height data with keyboard.Can begin to measure human body body weight and body fat rate, measurement result shows on display, and uses more direct, more convenient.
As shown in Figure 2, the glass scale pan 2 of body fat scale is provided with and the barefoot direct electrodes in contact plate 3 and 4 of human body, two battery lead plates are connected with the input end of human-body biological resistance metering circuit 6, biologic resistance to human body is sampled, and sampled result is sent to the 3rd port of microprocessor MCU system 7 by output terminal.Simultaneously, the LOAD CELLS 1 that connects with the glass scale pan 2 links to each other with weighing-up wave treatment circuit 5, is entered into first port of microprocessor MCU system 7 again by the output terminal of weighing-up wave treatment circuit 5 through the signal after the dual integration A/D conversion process.Human-body biological resistance metering circuit 6 and weighing-up wave treatment circuit 5 are input to microprocessor MCU system 7 simultaneously, output to LCD display 8 after 7 computings of microprocessor MCU system, are used to show measurement result and user profile.Memory storage circuit 11 links to each other with second port of microprocessor MCU system 7, is used for the tabulation of storage experience.Keyboard 9 links to each other with the I/O port of microprocessor MCU system 7, is used to set parameters such as subscriber data.
As shown in Figure 3, the waveform of the constant current source 61 in the human-body biological resistance metering circuit.
As shown in Figure 4, insert constant current source 61 between two battery lead plates 3 and 4 that human-body biological resistance metering circuit 6 connects, tested human body stand between battery lead plate 3 and 4 barefoot, by with two battery lead plates 3 and 4 contact, tested human body is clipped between the AC constant-current source 61.The signal that records is through 62 pairs of signal trace samplings of voltage follower, sampled signal through 65 pairs of inputs of differential amplifier amplifies then, carry out rectification, filtering through half-wave rectifier 66 and wave filter 67 again, at last treated body voltages signal is input to the 3rd port of microprocessor MCU system 7, after the microprocessor computing, tabling look-up draws the concrete numerical value of tested human body biologic resistance.
As shown in Figure 5, insert constant current source 61 between the battery lead plate 3 and 4 that human-body biological resistance metering circuit 6 connects, before measuring, must be connected between battery lead plate 3 and 4 with precision resistance case 60, the voltage signal of precision resistance case 60 amplifies through differential amplifier 65, carry out rectification, filtering through half-wave rectifier 66 and wave filter 67 again, defeated at last people is to the 3rd port of microprocessor MCU system 7.The change scope of the resistance value of precision resistance case 60 is between Europe, 100 Europe to 10000, the size of the resistance value by changing the precision resistance case, change the voltage signal of voltage follower output, order is through differential amplifier, half-wave rectifier, filter passes is passed to microprocessor MCU system 7 at last, the pass of the resistance value of precision resistance case 60 and voltage follower output voltage signal is: U=RQ, wherein U is the poor time variant voltage signal of precision resistance case 60 outputs, R is the resistance value of precision resistance case 60, Q is the enlargement factor of differential amplifier 65, debugging before measuring human-body biological resistance is a fixed constant, so the linear relationship that U is directly proportional with R.Therefore by changing the resistance value of precision resistance case, can form an experience tabulation in the storer of microprocessor, this experience tabulation is for the use of calculating human-body biological resistance, and with permanent storage in microprocessor.
As shown in Figure 6, because electronic devices and components such as wiring board, resistance, electric capacity are variant; Therefore before measuring human-body biological resistance, the enlargement factor of differential amplifier 65 must be through adjusting.Method of adjustment is: (1) at the fixing precision resistance 68 of resistance value of two terminations of battery lead plate 3 and 4, resistance is 1000 ohm; (2) resistance of the feedback resistance K of adjustment differential amplifier 65, can read shown resistance simultaneously on display is 1000 ohm; (3) when the displayed value of display identical with desired value or the two differ native 0.5% the time, i.e. the enlargement factor adjustment of differential amplifier 5 is finished.
As shown in Figure 7, measuring the voltage signal of human-body biological resistance circuit output and the pass of human-body biological resistance impedance is: U=RmQ, wherein U is the voltage signal of human body biologic resistance circuit output, Rm is the impedance of human body biologic resistance, Q is the enlargement factor of differential amplifier 5, debugging before measuring human-body biological resistance is a fixed constant, so the linear relationship that U is directly proportional with Rm.Therefore the concrete numerical value of the biologic resistance impedance of the tested human body acquisition of just can from the experience of microprocessor is tabulated, tabling look-up.The concrete numerical value of the biologic resistance impedance of resulting tested human body carries out computing by the mathematical model of microprocessor WIU system 7 again, can obtain the body fat rate of tested human body.
The utility model body fat scale stand on the scale pan by the measured barefoot, sole contacts with electrode slice, through the mode of LOAD CELLS, weighing-up wave treatment circuit, human-body biological metering circuit, and then the mathematical model calculation process by microprocessor system inside.Reach the purpose that human body weight, the measurement of human body body fat rate is combined in body.
When measuring human-body biological resistance, tested human body is stepped on barefoot on two electrodes, and the voltage signal of output is a benchmark with this moment, and by that experience tabulation in the microprocessor memory, tabling look-up draws the concrete numerical value of human-body biological resistance.
This body fat scale also can be finished the measurement of human body body weight and body fat rate separately.Its ultimate principle is: standing barefoot by the measured contacts the value of human-body biological resistance metering circuit with battery lead plate, record human body weight by weight sensor 1 and weighing-up wave treatment circuit 5 simultaneously.With parameter substitution mathematical models such as the human body height of the human body weight that records, human body resistance and keyboard 9 inputs, age, sex, Measuring Time, carry out computing by microprocessor MCU system 7, can obtain the fat percentage in human body weight and the human body body respectively.Simultaneously-measured data show that on the display lcd 8 of body fat scale it is more convenient to allow the user use.
The mathematical model expression formula of each parameter is as follows:
Fat＝aH+bY+cW+dRm+eS
Bf(％)＝Fat/W*100％
More than various in, H is human body height (cm), Y is tested person's age, W is a human body weight, Rm is tested person's a human-body biological resistance value, and Fat is a human body body fat value, and Bf (%) is the fat percentage in the human body body, S is a sex, when S was the male sex, e was 1, when S is the women, e is 0, and wherein a, b, c, d are coefficient.In mathematical model, W, H, Y, Rm and sex are the parameter through the keyboard input.
Claims (4)
1. body fat scale, comprise the scale pan of weighing in, with the LOAD CELLS that connects with the scale pan, it is characterized in that: the output terminal of described LOAD CELLS is connected with the input end of weighing-up wave treatment circuit, the output terminal of weighing-up wave treatment circuit is connected with first port of microprocessor, the scale pan is provided with two foot-operated electrodes, foot-operated electrode is connected with the input end of human-body biological resistance metering circuit, its output terminal is connected with the 3rd port of microprocessor, second port of microprocessor is connected with the memory storage circuit, its the 4th port is connected with display, and its I/O port is connected with keyboard.
2. body fat scale according to claim 1, it is characterized in that: described human-body biological resistance metering circuit is linked in sequence by constant current source, voltage follower, differential amplifier, half-wave rectifier, wave filter, voltage follower is connected with foot-operated electrode, and the signal of exporting from wave filter is passed to microprocessor.
3. body fat scale according to claim 2 is characterized in that: be connected with the precision resistance of adjusting the differential amplifier enlargement factor between two electrodes of described differential amplifier.
4. body fat scale according to claim 3 is characterized in that: the resistance of the precision resistance that connects between two electrodes of described differential amplifier is 1000 ohm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200320116498 CN2704830Y (en) | 2003-11-10 | 2003-11-10 | Human body fat balances |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200320116498 CN2704830Y (en) | 2003-11-10 | 2003-11-10 | Human body fat balances |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2704830Y true CN2704830Y (en) | 2005-06-15 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 200320116498 Expired - Fee Related CN2704830Y (en) | 2003-11-10 | 2003-11-10 | Human body fat balances |
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| Country | Link |
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| CN (1) | CN2704830Y (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103263294A (en) * | 2013-04-22 | 2013-08-28 | 刘梦阳 | Health indicator parameter detection instrument, device and system |
| CN105333936A (en) * | 2015-11-21 | 2016-02-17 | 马俊 | Electronic scale measuring impedance of human body at high frequency |
| CN105823543A (en) * | 2016-04-21 | 2016-08-03 | 张小林 | Body weight scale with memory function and automatic prompting function |
-
2003
- 2003-11-10 CN CN 200320116498 patent/CN2704830Y/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103263294A (en) * | 2013-04-22 | 2013-08-28 | 刘梦阳 | Health indicator parameter detection instrument, device and system |
| CN105333936A (en) * | 2015-11-21 | 2016-02-17 | 马俊 | Electronic scale measuring impedance of human body at high frequency |
| CN105823543A (en) * | 2016-04-21 | 2016-08-03 | 张小林 | Body weight scale with memory function and automatic prompting function |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20050615 Termination date: 20091210 |