CN201600207U - Pressure transmitter circuit powered by single power supply - Google Patents
Pressure transmitter circuit powered by single power supply Download PDFInfo
- Publication number
- CN201600207U CN201600207U CN2009202410842U CN200920241084U CN201600207U CN 201600207 U CN201600207 U CN 201600207U CN 2009202410842 U CN2009202410842 U CN 2009202410842U CN 200920241084 U CN200920241084 U CN 200920241084U CN 201600207 U CN201600207 U CN 201600207U
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- output terminal
- operational amplifier
- circuit
- power supply
- pressure transmitter
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Abstract
The utility model provides a pressure transmitter circuit powered by a single power supply, comprising a variable resistor connected with an A/D conversion benchmark voltage; the other end of the variable resistor is connected with an input terminal of a Wheatstone bridge circuit and the other input terminal is grounded; one output terminal of the Wheatstone bridge circuit is connected with an in-phase input terminal of an operation amplifier; the other output terminal of the Wheatstone bridge circuit is connected with a reverse-phase input terminal of the operation amplifier and is grounded after being connected with a protective resistor; the operation amplifier is connected with a potentiometer at the zeroing terminal; a resistor is connected between the in-phase input terminal of the operation amplifier and the output terminal; the output terminal of the operation amplifier is connected in series with a heteropolar capacitor used for filtering and is then grounded. By adopting the single operation amplifier, the circuit structure is simpler and can be arranged in a sensor; furthermore, the measurement requirement is met, the pressure measurement adopts the proportion method radically, and the requirement on the excitation voltage is reduced.
Description
Technical field
The utility model relates to the pressure unit technical field, specifically is a kind of pressure transmitter circuit of single power supply.
Background technology
For a long time, pressure transmitter circuit adopts two above operational amplifiers, and complex structure causes and can't be put in the sensor.
The utility model content
In order to overcome the shortcoming that above-mentioned prior art exists, the purpose of this utility model is to provide a kind of operation of can returning to zero easily, and humidity-proof ability is strong, is subjected to temperature environment to influence the pressure transmitter circuit of less single power supply.
The technical scheme that its technical matters that solves the utility model adopts is: a kind of pressure transmitter circuit of single power supply, comprise that one connects the variable resistor R of A/D conversion reference voltage, the variable resistor R other end is connected another input end grounding of Hui Sitong bridge circuit with a favour stone bridge circuit input end; Described favour stone bridge circuit one output terminal connects the in-phase input end of an operational amplifier, and another output terminal connects the inverting input of described operational amplifier, and connects ground connection behind the protective resistance R2.
Described operational amplifier and the potentiometer RP that is connected its zeroing end.Be connected a resistance R 1 between the in-phase input end of operational amplifier and the output terminal, resistance R 1 is introduced positive feedback, and makes the operational amplifier normal phase input end form DC channel, and inner difference is in control necessary input bias current.Described operational amplifier output terminal is connected a filtering with electrode capacitance C ground connection is arranged.
When pressure acted on the pressure parts, resistance value changed and produces a linearization output signal that is directly proportional with applied pressure.We add direct supply on the Hui Sitong bridge circuit, will produce the output of a d. c. voltage signal.Through the conversion of amplifying circuit secondary, realize 4～20MA output.Driving voltage series connection potentiometer RP is used for zeroing.Rule of three has been adopted in pressure survey, has reduced the requirement to driving voltage.
As further technical scheme of the present utility model:
Described A/D conversion reference voltage value is 12V.
To be temperature coefficient be 25ppm/ ℃ 0.5% metalfilmresistor to each resistance in the described circuit.
Described operational amplifier is 3140 types.
The beneficial effects of the utility model are: adopt single operational amplifier, circuit structure is simpler, can put into sensor, and satisfies measurement requirement, and rule of three has been adopted in pressure survey in essence, has reduced the requirement to driving voltage.
Description of drawings
Below in conjunction with drawings and Examples the utility model is described further:
Fig. 1 is the electrical block diagram of the utility model embodiment.
Embodiment
As shown in Figure 1, the pressure transmitter circuit of this single power supply comprises sensor circuit, amplifying circuit.
Described sensor circuit is formed by the variable resistor R series connection Hui Sitong bridge circuit that connects 12V A/D conversion reference voltage.Each resistance is that temperature coefficient is 25ppm/ ℃ 0.5% metalfilmresistor in the circuit.When pressure acted on the pressure parts, resistance value changed and produces a linearization output signal that is directly proportional with applied pressure.
The variable resistor R other end is connected another input end grounding with a favour stone bridge circuit input end.This variable resistor R is used for fine setting.Described favour stone bridge circuit one output terminal connects the in-phase input end of an operational amplifier 3140; The inverting input of another output terminal concatenation operation amplifier 3140, and connect ground connection behind the protective resistance R2.
Sensor circuit is outside by connecting, and pressure parts produces electric current to be changed, and electric current is transmitted into amplifying circuit by circuit.Described amplifying circuit is a differential amplifier circuit, comprises described operational amplifier and the potentiometer RP that is connected its zeroing end; Be connected a resistance R 1 between the in-phase input end of operational amplifier 3140 and the output terminal.Resistance R 1 is introduced positive feedback, and makes operational amplifier 3140 normal phase input ends form DC channel, and inner difference is in control necessary input bias current.Described output terminal is connected a filtering with ground connection behind the electrode capacitance C is arranged.
On the Hui Sitong bridge circuit, add direct supply, will produce the output of a d. c. voltage signal.Through the conversion of amplifying circuit secondary, realize 4～20MA output.Driving voltage series connection potentiometer RP is used for zeroing.Rule of three has been adopted in pressure survey, has reduced the requirement to driving voltage.
The parameter of each components and parts can be decided as required in the utility model.Adjust the whole enlargement factor of adjustable size of R1, R2.
Claims (4)
1. the pressure transmitter circuit of single power supply is characterized in that: comprise that one connects the variable resistor (R) of A/D conversion reference voltage, variable resistor (R) other end is connected another input end grounding of Hui Sitong bridge circuit with a favour stone bridge circuit input end; Described favour stone bridge circuit one output terminal connects the in-phase input end of an operational amplifier, and another output terminal connects the inverting input of described operational amplifier, and connects a protective resistance (R2) back ground connection; Described operational amplifier and the potentiometer (RP) that is connected its zeroing end; Be connected a resistance (R1) between the in-phase input end of this operational amplifier and the output terminal, described operational amplifier output terminal is connected a filtering with electrode capacitance (C) back ground connection is arranged.
2. the pressure transmitter circuit of single power supply according to claim 1, it is characterized in that: described A/D conversion reference voltage value is 12V.
3. the pressure transmitter circuit of single power supply according to claim 1 and 2 is characterized in that: to be temperature coefficient be 25ppm/ ℃ 0.5% metalfilmresistor to each resistance in the described circuit.
4. the pressure transmitter circuit of single power supply according to claim 3, it is characterized in that: described operational amplifier is 3140 types.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009202410842U CN201600207U (en) | 2009-11-03 | 2009-11-03 | Pressure transmitter circuit powered by single power supply |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009202410842U CN201600207U (en) | 2009-11-03 | 2009-11-03 | Pressure transmitter circuit powered by single power supply |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201600207U true CN201600207U (en) | 2010-10-06 |
Family
ID=42811269
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2009202410842U Expired - Fee Related CN201600207U (en) | 2009-11-03 | 2009-11-03 | Pressure transmitter circuit powered by single power supply |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN201600207U (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102412768A (en) * | 2011-12-01 | 2012-04-11 | 镇江中福马机械有限公司 | Motor control device and method of cylinder-type barker |
| CN102680146A (en) * | 2011-02-07 | 2012-09-19 | 艾尔默斯半导体股份公司 | Pressure-sensitive amplifier stage |
| CN103063929A (en) * | 2013-01-05 | 2013-04-24 | 苏州市静电设备研究所有限责任公司 | Oil product conductivity tester system |
| CN107844217A (en) * | 2017-10-26 | 2018-03-27 | 厦门天马微电子有限公司 | A kind of display panel and display device |
| CN110220537A (en) * | 2019-06-12 | 2019-09-10 | 五邑大学 | A kind of detection circuit applied to piezoresistive transducer |
-
2009
- 2009-11-03 CN CN2009202410842U patent/CN201600207U/en not_active Expired - Fee Related
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102680146A (en) * | 2011-02-07 | 2012-09-19 | 艾尔默斯半导体股份公司 | Pressure-sensitive amplifier stage |
| CN102680146B (en) * | 2011-02-07 | 2016-03-16 | 艾尔默斯半导体股份公司 | pressure-sensitive amplifier stage |
| CN102412768A (en) * | 2011-12-01 | 2012-04-11 | 镇江中福马机械有限公司 | Motor control device and method of cylinder-type barker |
| CN103063929A (en) * | 2013-01-05 | 2013-04-24 | 苏州市静电设备研究所有限责任公司 | Oil product conductivity tester system |
| CN107844217A (en) * | 2017-10-26 | 2018-03-27 | 厦门天马微电子有限公司 | A kind of display panel and display device |
| CN110220537A (en) * | 2019-06-12 | 2019-09-10 | 五邑大学 | A kind of detection circuit applied to piezoresistive transducer |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20101006 Termination date: 20141103 |
|
| EXPY | Termination of patent right or utility model |