CN103852195A - Piezoresistive type pressure sensor power circuit powered by constant flow source - Google Patents
Piezoresistive type pressure sensor power circuit powered by constant flow source Download PDFInfo
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- CN103852195A CN103852195A CN201210513555.7A CN201210513555A CN103852195A CN 103852195 A CN103852195 A CN 103852195A CN 201210513555 A CN201210513555 A CN 201210513555A CN 103852195 A CN103852195 A CN 103852195A
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- pressure sensor
- type pressure
- operational amplifier
- piezoresistive type
- power circuit
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Abstract
A piezoresistive type pressure sensor power circuit powered by a constant flow source comprises an operational amplifier, wherein the in-phase end of the operational amplifier is connected with the 5V voltage, the reversal-phase end of the operational amplifier is connected with one end of a resistor R1 and an emission electrode of a PNP transistor, the other end of the resistor R1 is connected with the ground, a base electrode of the PNP transistor is connected with one end of a resistor R2, the other end of the resistor R2 is connected with the output end of the operational amplifier, and a collector electrode of the PNP transistor is connected with the power source input end of a piezoresistive type pressure sensor and supplies power to the piezoresistive type pressure sensor. According to the piezoresistive type pressure sensor power circuit, the influence of the temperature on output data of the piezoresistive type pressure sensor can be eliminated.
Description
Technical field
The present invention relates to pressure sensor application technical field, particularly a kind of piezoresistive pressure sensor power circuit that adopts constant current source power supply.
Background technology
Piezoresistive pressure sensor utilizes resistor disc along with thereby STRESS VARIATION resistance also respective change is obtained force value, piezoresistive pressure sensor adopts four to detect resistance, connect the form for Wheatstone bridge, suppose that four initial resistances that detect resistance are R, while having stress, wherein the resistance of two resistance increases, and increment is Δ R, and the resistance of two other resistance reduces, decrement is Δ R.If consider the impact of temperature, each resistance has certain variation delta R
'.Now sensor is output as
, wherein E is supply voltage, so output voltage signal now will be subject to the impact of temperature, has reduced measuring accuracy.
Summary of the invention
In order to overcome above-mentioned the deficiencies in the prior art, the object of the present invention is to provide a kind of piezoresistive pressure sensor power circuit that adopts constant current source power supply.
To achieve these goals, the technical solution used in the present invention is:
A kind of piezoresistive pressure sensor power circuit that adopts constant current source power supply, comprise the operational amplifier of homophase termination 5V voltage, one end of end of oppisite phase connecting resistance R1 of operational amplifier and the emitter of PNP pipe, the other end ground connection of resistance R 1, one end of the base stage connecting resistance R2 of PNP pipe, the output terminal of another termination operational amplifier of resistance R 2, the power input that the collector of PNP pipe connects piezoresistive pressure sensor is its power supply.
Compared with prior art, the present invention can eliminate the impact of temperature on piezoresistive pressure sensor self output data.
Brief description of the drawings
Accompanying drawing is structural representation of the present invention.
Embodiment
Below in conjunction with drawings and Examples, the present invention is carried out to more detailed explanation.
As shown in the figure, the present invention is a kind of piezoresistive pressure sensor power circuit that adopts constant current source power supply, comprise the operational amplifier of homophase termination 5V voltage, one end of end of oppisite phase connecting resistance R1 of operational amplifier and the emitter of PNP pipe, the other end ground connection of resistance R 1, one end of the base stage connecting resistance R2 of PNP pipe, the output terminal of another termination operational amplifier of resistance R 2, the power input that the collector of PNP pipe connects piezoresistive pressure sensor is its power supply.
In the present invention, the constant-current source circuit that has used operational amplifier, PNP pipe and resistance to form, is powered to piezoresistive pressure sensor by it, and the voltage signal of sensor output is: V=I Δ R, now irrelevant with temperature variation, therefore eliminate the impact of temperature.
Claims (1)
1. one kind adopts the piezoresistive pressure sensor power circuit of constant current source power supply, it is characterized in that, comprise the operational amplifier of homophase termination 5V voltage, one end of end of oppisite phase connecting resistance R1 of operational amplifier and the emitter of PNP pipe, the other end ground connection of resistance R 1, one end of the base stage connecting resistance R2 of PNP pipe, the output terminal of another termination operational amplifier of resistance R 2, the power input that the collector of PNP pipe connects piezoresistive pressure sensor is its power supply.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210513555.7A CN103852195A (en) | 2012-11-30 | 2012-11-30 | Piezoresistive type pressure sensor power circuit powered by constant flow source |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210513555.7A CN103852195A (en) | 2012-11-30 | 2012-11-30 | Piezoresistive type pressure sensor power circuit powered by constant flow source |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN103852195A true CN103852195A (en) | 2014-06-11 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201210513555.7A Pending CN103852195A (en) | 2012-11-30 | 2012-11-30 | Piezoresistive type pressure sensor power circuit powered by constant flow source |
Country Status (1)
| Country | Link |
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| CN (1) | CN103852195A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104767517A (en) * | 2015-04-10 | 2015-07-08 | 乐山一拉得电网自动化有限公司 | Data display instrument analog quantity output circuit |
-
2012
- 2012-11-30 CN CN201210513555.7A patent/CN103852195A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104767517A (en) * | 2015-04-10 | 2015-07-08 | 乐山一拉得电网自动化有限公司 | Data display instrument analog quantity output circuit |
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| C06 | Publication | ||
| PB01 | Publication | ||
| C02 | Deemed withdrawal of patent application after publication (patent law 2001) | ||
| WD01 | Invention patent application deemed withdrawn after publication |
Application publication date: 20140611 |