CN1528239A - Body resistance measuring circuit - Google Patents
Body resistance measuring circuit Download PDFInfo
- Publication number
- CN1528239A CN1528239A CNA2003101118214A CN200310111821A CN1528239A CN 1528239 A CN1528239 A CN 1528239A CN A2003101118214 A CNA2003101118214 A CN A2003101118214A CN 200310111821 A CN200310111821 A CN 200310111821A CN 1528239 A CN1528239 A CN 1528239A
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- circuit
- npn transistor
- operational amplifier
- human body
- resistance
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Abstract
The present invention relates to a human body resistance measuring circuit, and is characterized by that it includes self excited oscillation circuit formed from operational amplifier, capacitor and electrode parallelly-connected with reverse output end of operational amplifier and resistor and electrode parallelly-connected with equidirectional output end of operation amplifier and wave-shaping circuit formed from NPN transistor and resistors respectively series-connected on the base and collector of NPN transistor, the output voltage end of operational amplifier of the self-excited oscillation circuit is connected with base of NPN transistor of wave-shaping circuit, and the collector of the NPN transistor is parallelly-connected with signal output end. Said invention also provides its application method and concrete steps.
Description
Technical field
What the present invention relates to is a kind of circuit, especially a kind of human body resistance circuit that is used for.
Technical background
At present, be used for resistance measuring circuit that human body body internal resistance gauge adopted usually by AC constant-current source, ac amplifier circuit, filtering shaping circuit and analog-digital converter are formed, its work process is: contact with human body by two electrodes, the electric current that AC constant-current source the produces human body of flowing through, on human body, produce an alternative voltage drop, corresponding different human body resistance, having different alternating voltages produces, ac amplifier circuit detects and the voltage drop of amplification on human body, alternating voltage after the amplification becomes direct current signal through filtering transformation, and the direct current signal input analog-to-digital converter converts digital signal output to.This digital signal is input to microprocessor, can obtain the size of human body AC resistance as calculated, if cooperate the percentage ratio that just can calculate body fat, and result of calculation is shown, read for the user with other measuring circuit and subscriber data (as body weight, height, sex etc.).This resistance measuring circuit structure is complicated, and the manufacturing cost height.
Summary of the invention
The objective of the invention is deficiency, provide a kind of simple in structure at human body resistance circuit existence in the above-mentioned various human body body internal resistance measurement devices, and the good human body resistance circuit of measurement effect.
Inventor's bulk resistor measuring circuit is characterized in that: comprise by operational amplifier, the electric capacity that is attempted by the operational amplifier inverse output terminal and electrode, be attempted by the operational amplifier resistance of outfan and the self-maintained circuit that electrode constitutes in the same way; By NPN transistor and the resistance that is serially connected in respectively on NPN transistor base stage and the colelctor electrode constitute waveform shaping circuit; The output voltage terminal of the operational amplifier of self-maintained circuit is connected with the base stage of the NPN transistor of waveform shaping circuit, and the NPN transistor colelctor electrode also is connected to signal output part.
The design principle of inventor's bulk resistor measuring circuit is: utilize the conducting that contacts of the paired electrode of being drawn by self-maintained circuit and human body, the frequency of oscillation of the electric capacity decision self-maintained circuit on interelectrode human body AC resistance and the self-maintained circuit, when capacitor fixing, the frequency of oscillation of self-maintained circuit is only relevant with interelectrode human body AC resistance, corresponding different human body AC resistances, the frequency signal that self-maintained circuit output is different, the frequency signal of exporting through the output voltage terminal of self-maintained circuit is received by waveform shaping circuit, and waveform shaping circuit is transformed to square-wave signal output to the frequency signal that receives after shaping.Because the two interelectrode human body AC resistances that the frequency of oscillation of self-maintained circuit output only contacts with human body are associated, therefore, the square-wave signal of this human body resistance measuring circuit output is transported to relevant cooperating as microprocessor equifrequent measuring circuit, can calculate the size of human body AC resistance, if cooperate the percentage ratio that just can calculate body fat with other measuring circuit and subscriber data (as body weight, height, sex etc.), and result of calculation shown, read for the user.
Inventor's bulk resistor measuring circuit design science has circuit and constitutes simply low cost and other advantages.
The concrete structure of inventor's bulk resistor measuring circuit is provided in detail by the following drawings and embodiment.
Description of drawings
Fig. 1 is the human body resistance electrical block diagram.
Fig. 2 is the application sketch map of human body resistance circuit shown in Figure 1 on electronic platform scale.
Concrete truth mode
Embodiment: can be clear that from Fig. 1 human body resistance circuit 1 is made up of self-maintained circuit 1.1 and waveform shaping electricity 1.2, described self-maintained circuit 1.1 by operational amplifier A VD, the electric capacity c that is attempted by operational amplifier A VD inverse output terminal and electrode A, resistance R 1, R2, R3, R4 and the electrode B of outfan constitute in the same way to be attempted by operational amplifier A VD.Described waveform shaping electricity 1.2 is made of NPN transistor Q and the resistance R 5, the R6 that are serially connected in respectively on NPN transistor Q base stage and the colelctor electrode.The output voltage terminal of the operational amplifier A VD of self-maintained circuit 1.1 is connected with the base stage of the NPN transistor Q of waveform shaping circuit 1.2, and NPN transistor Q colelctor electrode also is connected to signal output part I/O.
This is the application sketch map of inventor's bulk resistor measuring circuit on a kind of electronic platform scale as seen from Figure 2, electronic platform scale comprises: the microprocessor 6 that is used for date processing, be used to measure the circuit 7 of weighing of human body weight, be used to show the display circuit 2 of measurement results such as human body weight and fat, be used to store the memory circuit 3 of the data such as calculating parameter, measurement result of setting, power circuit 5, the human body resistance circuit 1 that is used to that the keyboard 4 of human parameters, user's selection and switching on and shutting down is set and is used for human body impedance measuring.The described circuit 7 of weighing, display circuit 2, memory circuit 3, power circuit 5, keyboard 4 and human body resistance circuit 1 all are connected with microprocessor 6, the square-wave signal of inventor's bulk resistor measuring circuit 1 output is transported to microprocessor 6, and cooperate with above-mentioned each functional circuit, can calculate the size of human body AC resistance, if cooperate the percentage ratio that just can calculate body fat with other measuring circuit and subscriber data (as body weight, height, sex etc.), and result of calculation shown, read for the user.
Claims (1)
1, a kind of human body resistance circuit is characterized in that: comprise by operational amplifier, the electric capacity that is attempted by the operational amplifier inverse output terminal and electrode, be attempted by the operational amplifier resistance of outfan and the self-maintained circuit that electrode constitutes in the same way; By NPN transistor and the resistance that is serially connected in respectively on NPN transistor base stage and the colelctor electrode constitute waveform shaping circuit; The output voltage terminal of the operational amplifier of self-maintained circuit is connected with the base stage of the NPN transistor of waveform shaping circuit, and the NPN transistor colelctor electrode also is connected to signal output part.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2003101118214A CN1528239A (en) | 2003-10-15 | 2003-10-15 | Body resistance measuring circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2003101118214A CN1528239A (en) | 2003-10-15 | 2003-10-15 | Body resistance measuring circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN1528239A true CN1528239A (en) | 2004-09-15 |
Family
ID=34304817
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNA2003101118214A Pending CN1528239A (en) | 2003-10-15 | 2003-10-15 | Body resistance measuring circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1528239A (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103344834A (en) * | 2013-06-27 | 2013-10-09 | 成都网动光电子技术股份有限公司 | Device for testing body resistance |
| CN103354052A (en) * | 2013-06-28 | 2013-10-16 | 雷建设 | Resistor series-parallel connection demonstrator |
| CN105677093A (en) * | 2016-01-04 | 2016-06-15 | 京东方科技集团股份有限公司 | Touch device and electronic device |
| CN108742585A (en) * | 2018-05-03 | 2018-11-06 | 北京航空航天大学 | A kind of rheohepatogram measuring device |
-
2003
- 2003-10-15 CN CNA2003101118214A patent/CN1528239A/en active Pending
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103344834A (en) * | 2013-06-27 | 2013-10-09 | 成都网动光电子技术股份有限公司 | Device for testing body resistance |
| CN103354052A (en) * | 2013-06-28 | 2013-10-16 | 雷建设 | Resistor series-parallel connection demonstrator |
| CN105677093A (en) * | 2016-01-04 | 2016-06-15 | 京东方科技集团股份有限公司 | Touch device and electronic device |
| WO2017118208A1 (en) * | 2016-01-04 | 2017-07-13 | 京东方科技集团股份有限公司 | Touch device and electronic device |
| CN105677093B (en) * | 2016-01-04 | 2018-06-12 | 京东方科技集团股份有限公司 | A kind of touch device and electronic equipment |
| CN108742585A (en) * | 2018-05-03 | 2018-11-06 | 北京航空航天大学 | A kind of rheohepatogram measuring device |
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