CN102252788B - Compensation circuit for pressure sensor - Google Patents
Compensation circuit for pressure sensor Download PDFInfo
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- CN102252788B CN102252788B CN 201110084484 CN201110084484A CN102252788B CN 102252788 B CN102252788 B CN 102252788B CN 201110084484 CN201110084484 CN 201110084484 CN 201110084484 A CN201110084484 A CN 201110084484A CN 102252788 B CN102252788 B CN 102252788B
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- electric bridge
- operational amplifier
- negative temperature
- integrated operational
- resistance
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Abstract
The invention discloses a compensation circuit for a pressure sensor. The compensation circuit comprises a bridge, a sensitivity compensation resistor, a negative temperature coefficient resistor, an integrated operational amplifier, a feedback resistor, a power supply, and an output end. The sensitivity compensation resistor and the negative temperature coefficient resistor are used for offsetting the influence caused by the change of the sensitivity with the change of temperature; and the feedback resistor forms a feedback loop through the zero setting end of the integrated operational amplifier. When the output voltage is subjected to zero drift, the output drift voltage is greatly reduced through the feedback loop and an internal difference circuit of the integrated operational amplifier, so that the zero drift is controlled to be in the required range.
Description
Technical field
The present invention relates to art of pressure sensors, relate in particular to the compensating circuit of pressure transducer.
Background technology
The output voltage of sensor be directly proportional by the size of dynamometry, in theory, sensor output voltage under not being subjected to by the situation of dynamometry is zero.In the actual product, because forming each electrostrictive strain resistance of electric bridge can not be in full accord, during temperature variation, the variation of each strain resistor of electric bridge also can not be in full accord, and sensor erection stress and elastic body are from the effect of gravity etc., this can cause sensor under not being subjected to by the situation of dynamometry, still has certain Voltage-output, and zero point drift occurs.
Summary of the invention
The technical problem to be solved in the present invention is for the deficiencies in the prior art, a kind of compensating circuit of pressure transducer is provided, by backfeed loop, utilizes the inside difference channel of integrated transporting discharging, so that output shift voltage reduces greatly, and then so that zero point drift be controlled in the claimed range.
The present invention solves the problems of the technologies described above the technical scheme that adopts:
A kind of pressure transducer compensating circuit, comprise electric bridge, sensitivity compensation resistance, negative temperature coefficient resister, integrated operational amplifier, feedback resistance, power supply, output terminal.Sensitivity compensation resistance has the characteristic of negative temperature-coefficient of electrical resistance between the power end of electric bridge, when temperature raise, sensitivity reduced; Negative temperature coefficient resister one end is connected with an end of power supply, and another section is connected with the power end of electric bridge, is used for offsetting sensitivity and varies with temperature the impact that brings; Feedback resistance consists of backfeed loop by the zeroing end of integrated budget amplifier.Electric bridge adopts symmetrical bridge construction to link to each other by four strain resistors and forms, and satisfies R1/R2=R3/R4, and the power end of electric bridge is connected with power supply, and the output terminal of electric bridge is connected with integrated operational amplifier.Feedback resistance can be the plus or minus feedback resistance.Sensitivity has negative temperature coefficient feature.
Compared with prior art, the invention provides a kind of compensating circuit of pressure transducer, when output voltage generation zero point drift, pass through backfeed loop, utilize the inside difference channel of integrated transporting discharging so that output shift voltage reduces greatly, and then so that zero point drift be controlled in the claimed range.
Description of drawings
Accompanying drawing is the structural representation of the compensating circuit of a kind of pressure transducer of the present invention.
Number in the figure: 1 strain resistor R1,2 strain resistor R2,3 strain resistor R3,4 strain resistor R4,5 sensitivity compensation resistance, 6 negative temperature coefficient resisters, 7 bridge power supply ends, 8 electric bridge output terminals, 9 integrated operational amplifiers, 10 output terminals, 11 zeroing ends, 12 feedback resistances, 13 power supplys
Embodiment
Embodiment is described in further detail the present invention below in conjunction with accompanying drawing.
A kind of pressure transducer compensating circuit, comprise strain resistor R1 (1), strain resistor R2 (2), strain resistor R3 (3), strain resistor R4 (4), sensitivity compensation resistance (5), negative temperature coefficient resister (6), integrated operational amplifier (9), output terminal (10), feedback resistance (12), power supply (13),, as shown in Figure 1.Sensitivity compensation resistance (5) is positioned between the power end (7) of electric bridge, has the characteristic of negative temperature-coefficient of electrical resistance, and when temperature raise, sensitivity reduced; Negative temperature coefficient resister (6) one ends are connected with an end of power supply (13), and another section is connected with the power end (7) of electric bridge, is used for offsetting sensitivity and varies with temperature the impact that brings; Feedback resistance (12) consists of backfeed loop by the zeroing end (11) of integrated operational amplifier.When output voltage generation zero point drift, by backfeed loop, utilize the inside difference channel of integrated transporting discharging so that output shift voltage reduces greatly, and then so that zero point drift be controlled in the claimed range.Electric bridge adopts symmetrical bridge construction to link to each other by four strain resistors and forms, and satisfy R1/R2=R3/R4, the power end of electric bridge (7) is connected with power supply (13), the output terminal of electric bridge (8) is connected with integrated operational amplifier (9), feedback resistance (12) can be the plus or minus feedback resistance, so that sensitivity has negative temperature coefficient feature.
More than show and described ultimate principle of the present invention and principal character and advantage of the present invention.The technician of the industry should understand; the present invention is not restricted to the described embodiments; that describes in above-described embodiment and the instructions just illustrates principle of the present invention; without departing from the spirit and scope of the present invention; the present invention also has various changes and modifications, and these changes and improvements all fall in the claimed scope of the invention.The claimed scope of the present invention is defined by appending claims and equivalent thereof.
Claims (4)
1. the compensating circuit of a pressure transducer comprises electric bridge, sensitivity compensation resistance, negative temperature coefficient resister, integrated operational amplifier, feedback resistance, power supply, output terminal, it is characterized in that:
Described sensitivity compensation resistance is between the power end of electric bridge;
Described negative temperature coefficient resister one end is connected with an end of power supply, and the described negative temperature coefficient resister other end is connected with a power end of electric bridge, and another power end of electric bridge is connected with the other end of power supply;
Described feedback resistance consists of backfeed loop by the zeroing end of integrated operational amplifier;
Described output terminal is connected with integrated operational amplifier.
Pressure transducer according to claim 1 compensating circuit, it is characterized in that: described electric bridge adopts symmetrical bridge constructions to link to each other by four strain resistors and forms, and satisfies R1/R2=R3/R4.
Pressure transducer according to claim 1 compensating circuit, it is characterized in that: described feedback resistance can be the plus or minus feedback resistance.
Pressure transducer according to claim 1 compensating circuit, it is characterized in that: described sensitivity compensation resistance has the characteristic of negative temperature-coefficient of electrical resistance.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201110084484 CN102252788B (en) | 2011-04-06 | 2011-04-06 | Compensation circuit for pressure sensor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201110084484 CN102252788B (en) | 2011-04-06 | 2011-04-06 | Compensation circuit for pressure sensor |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN102252788A CN102252788A (en) | 2011-11-23 |
| CN102252788B true CN102252788B (en) | 2013-04-17 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201110084484 Expired - Fee Related CN102252788B (en) | 2011-04-06 | 2011-04-06 | Compensation circuit for pressure sensor |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN102252788B (en) |
Families Citing this family (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102519653A (en) * | 2011-12-15 | 2012-06-27 | 武汉理工大学 | Spring tube and foil gauge combined type digital pressure gauge |
| CN102590632B (en) * | 2012-03-19 | 2014-05-28 | 常州工学院 | Insulation resistance test circuit for circuit board |
| CN102937493A (en) * | 2012-11-06 | 2013-02-20 | 昆山北极光电子科技有限公司 | Measuring circuit for pressure strain gauge |
| CN103690157A (en) * | 2013-12-30 | 2014-04-02 | 上海交通大学 | Uniformly-transmitting pressure sensor used for artificial anal sphincter system |
| CN105021347B (en) * | 2015-06-26 | 2019-01-25 | 深圳市芯海科技有限公司 | A kind of sensitivity adjustment circuit and sensitivity correction method of bridge pressure sensor |
| CN109029841A (en) * | 2018-08-28 | 2018-12-18 | 李凯 | Pressure transmitter null offset auto-correction method and system |
| CN109668674B (en) * | 2019-02-26 | 2023-10-03 | 厦门乃尔电子有限公司 | High-precision temperature compensation circuit and method for silicon piezoresistive pressure sensor |
| CN111780900B (en) * | 2020-06-11 | 2022-06-07 | 宁波柯力传感科技股份有限公司 | Strain force transducer |
| CN112945459B (en) * | 2021-02-25 | 2023-04-14 | 中航电测仪器股份有限公司 | Zero-offset temperature compensation method of force signal conditioner |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN87203913U (en) * | 1987-03-20 | 1988-08-10 | 中国科学院合肥智能机械研究所 | Semiconductor strain gauge for analog integration compensation |
| JPH0351733A (en) | 1989-07-19 | 1991-03-06 | Fuji Electric Co Ltd | Amplification compensation circuit for semiconductor pressure sensor |
| US5187985A (en) * | 1991-09-19 | 1993-02-23 | Honeywell Inc. | Amplified pressure transducer |
| CN1511252A (en) * | 2001-05-25 | 2004-07-07 | ÷ | Highly sensitive pressure sensor with long-term stability |
| CN202229863U (en) * | 2011-07-04 | 2012-05-23 | 程方舟 | Compensation circuit of pressure sensor |
-
2011
- 2011-04-06 CN CN 201110084484 patent/CN102252788B/en not_active Expired - Fee Related
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN87203913U (en) * | 1987-03-20 | 1988-08-10 | 中国科学院合肥智能机械研究所 | Semiconductor strain gauge for analog integration compensation |
| JPH0351733A (en) | 1989-07-19 | 1991-03-06 | Fuji Electric Co Ltd | Amplification compensation circuit for semiconductor pressure sensor |
| US5187985A (en) * | 1991-09-19 | 1993-02-23 | Honeywell Inc. | Amplified pressure transducer |
| CN1511252A (en) * | 2001-05-25 | 2004-07-07 | ÷ | Highly sensitive pressure sensor with long-term stability |
| CN202229863U (en) * | 2011-07-04 | 2012-05-23 | 程方舟 | Compensation circuit of pressure sensor |
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| CN102252788A (en) | 2011-11-23 |
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