CN204562136U - For the auto-calibrating sensor of electric sphygmomanometer - Google Patents
For the auto-calibrating sensor of electric sphygmomanometer Download PDFInfo
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- CN204562136U CN204562136U CN201520226146.8U CN201520226146U CN204562136U CN 204562136 U CN204562136 U CN 204562136U CN 201520226146 U CN201520226146 U CN 201520226146U CN 204562136 U CN204562136 U CN 204562136U
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- operational amplifier
- diffused
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- current source
- silicon pressure
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Abstract
This utility model relates to a kind of auto-calibrating sensor for electric sphygmomanometer, it is characterized in that: on constant-current source circuit, be connected with difference channel and addition amplifying circuit in turn, described constant-current source circuit is connected to form by diffused-silicon pressure electric bridge and operational amplifier I.This utility model adopts said structure employing can control constant-current source and provides diffused-silicon pressure bridge offset electric current, before carrying out analog/digital AD conversion, adopt adder operational amplifier to carry out the deviation adjustment of signal transmission, automatic calibration can be completed when switching on power at every turn immediately to the bridge arm balance of diffused-silicon pressure electric bridge, signal transmission deviation.Solve the technical problem that the deviation of signal that exists in prior art is large.
Description
Technical field
This utility model relates to a kind of sensor, in particular for the auto-calibrating sensor of electric sphygmomanometer.
Background technology
At present, known electric sphygmomanometer great majority adopt diffused-silicon pressure electric bridge as sensor.Can produce temperature drift because of the period effects of variation of ambient temperature after using for a long time, the mechanism because of repeated charge changes the initial deviation calibration balance of diffused-silicon pressure electric bridge brachium pontis, signal can be made to produce deviation because of the aging change of electronic component.
Summary of the invention
In order to solve the problems of the technologies described above, the invention provides the auto-calibrating sensor for electric sphygmomanometer.Employing can control constant-current source and provide diffused-silicon pressure bridge offset electric current, before carrying out analog/digital AD conversion, adopt adder operational amplifier to carry out the deviation adjustment of signal transmission, automatic calibration can be completed when switching on power at every turn immediately to the bridge arm balance of diffused-silicon pressure electric bridge, signal transmission deviation.Solve the technical problem that the deviation of signal that exists in prior art is large.
To achieve these goals, the technical solution used in the present invention is: for the auto-calibrating sensor of electric sphygmomanometer, it is characterized in that: on constant-current source circuit, be connected with difference channel and addition amplifying circuit in turn, described constant-current source circuit is connected to form by diffused-silicon pressure electric bridge and operational amplifier I;
The in-phase input end of described operational amplifier I is connected on the outfan I of digital-to-analog conversion.
Described difference channel is connected to form by operational amplifier II and resistance, and the inverting input of operational amplifier II is connected on the input I of analog/digital conversion, and the in-phase input end of operational amplifier II is connected on diffused-silicon pressure electric bridge after resistance.
Addition amplifying circuit is connected to form by operational amplifier III and resistance, be connected on the input II of analog/digital conversion after the outfan of operational amplifier III is in parallel with the outfan of operational amplifier II, the opposite inputs of operational amplifier III is connected on the outfan II of digital-to-analog conversion, and the in-phase input end of operational amplifier III is connected on accurate voltage VREF together with the in-phase input end of operational amplifier II.
The beneficial effects of the utility model are: this utility model adopts said structure employing can control constant-current source and provides diffused-silicon pressure bridge offset electric current, before carrying out analog/digital AD conversion, adopt adder operational amplifier to carry out the deviation adjustment of signal transmission, automatic calibration can be completed when switching on power at every turn immediately to the bridge arm balance of diffused-silicon pressure electric bridge, signal transmission deviation.Solve the technical problem that the deviation of signal that exists in prior art is large.
Accompanying drawing explanation
Fig. 1: be electrical schematic diagram of the present utility model.
Detailed description of the invention
Below in conjunction with accompanying drawing, this utility model is described in detail.
For the auto-calibrating sensor of electric sphygmomanometer, it is characterized in that: on constant-current source circuit 1, be connected with difference channel 2 and addition amplifying circuit 3 in turn, described constant-current source circuit 1 is connected to form by diffused-silicon pressure electric bridge 4 and operational amplifier I5;
The in-phase input end of operational amplifier I5 is connected on the outfan I6 of digital-to-analog conversion.
Difference channel 2 is connected to form by operational amplifier II7 and resistance, and the inverting input of operational amplifier II7 is connected on the input I8 of analog/digital conversion, and the in-phase input end of operational amplifier II7 is connected on diffused-silicon pressure electric bridge 4 after resistance.
Addition amplifying circuit 3 is connected to form by operational amplifier III9 and resistance, be connected on the input II10 of analog/digital conversion after the outfan of operational amplifier III9 is in parallel with the outfan of operational amplifier II7, the opposite inputs of operational amplifier III9 is connected on the outfan II11 of digital-to-analog conversion, and the in-phase input end of operational amplifier III9 is connected on accurate voltage VREF together with the in-phase input end of operational amplifier II7.
In use, by digital-to-analog conversion output I6 and digital-to-analog conversion output II11 output current in this invention circuit, by controlling the size of output current, regulate the midpoint potential of bridge balance brachium pontis, adopt diffused-silicon pressure electric bridge 4 to obtain differential pressure signal, differential pressure signal is entering analog/digital conversion input I; II (8; 10) front, carry out signal adjustment through difference channel 2 and addition amplifying circuit 3, remove signal transmission deviation, carry out benchmark automatic calibration through constant-current source and adder operational amplifier.
Claims (4)
1. for the auto-calibrating sensor of electric sphygmomanometer, it is characterized in that: on constant-current source circuit (1), be connected with difference channel (2) and addition amplifying circuit (3) in turn, described constant-current source circuit (1) is by diffused-silicon pressure electric bridge (4) and operational amplifier I(5) connect to form.
2. the auto-calibrating sensor for electric sphygmomanometer according to claim 1, is characterized in that: described operational amplifier I(5) in-phase input end be connected to digital-to-analog conversion outfan I(6) on.
3. the auto-calibrating sensor for electric sphygmomanometer according to claim 1, it is characterized in that: described difference channel (2) is by operational amplifier II(7) connect to form with resistance, operational amplifier II(7) inverting input be connected to the input I(8 of analog/digital conversion) on, operational amplifier II(7) in-phase input end be connected to after resistance on diffused-silicon pressure electric bridge (4).
4. the auto-calibrating sensor for electric sphygmomanometer according to claim 1, it is characterized in that: addition amplifying circuit (3) is by operational amplifier III(9) connect to form with resistance, operational amplifier III(9) outfan and operational amplifier II(7) outfan in parallel after be connected to the input II(10 of analog/digital conversion) on, operational amplifier III(9) opposite inputs be connected to digital-to-analog conversion outfan II (11) on, operational amplifier III(9) in-phase input end and operational amplifier II(7) in-phase input end together be connected on accurate voltage VREF.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520226146.8U CN204562136U (en) | 2015-04-15 | 2015-04-15 | For the auto-calibrating sensor of electric sphygmomanometer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520226146.8U CN204562136U (en) | 2015-04-15 | 2015-04-15 | For the auto-calibrating sensor of electric sphygmomanometer |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN204562136U true CN204562136U (en) | 2015-08-19 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201520226146.8U Active CN204562136U (en) | 2015-04-15 | 2015-04-15 | For the auto-calibrating sensor of electric sphygmomanometer |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN204562136U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112294279A (en) * | 2020-10-29 | 2021-02-02 | 江西理工大学 | Integrated invasive blood pressure sensor |
-
2015
- 2015-04-15 CN CN201520226146.8U patent/CN204562136U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112294279A (en) * | 2020-10-29 | 2021-02-02 | 江西理工大学 | Integrated invasive blood pressure sensor |
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| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant |