CN202305072U - Pressure transmitter - Google Patents
Pressure transmitter Download PDFInfo
- Publication number
- CN202305072U CN202305072U CN 201120348800 CN201120348800U CN202305072U CN 202305072 U CN202305072 U CN 202305072U CN 201120348800 CN201120348800 CN 201120348800 CN 201120348800 U CN201120348800 U CN 201120348800U CN 202305072 U CN202305072 U CN 202305072U
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- China
- Prior art keywords
- pressure
- core body
- different
- resistance
- exciting current
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- Expired - Fee Related
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
- G01L9/00—Measuring steady of quasi-steady pressure of fluid or fluent solid material by electric or magnetic pressure-sensitive elements; Transmitting or indicating the displacement of mechanical pressure-sensitive elements, used to measure the steady or quasi-steady pressure of a fluid or fluent solid material, by electric or magnetic means
- G01L9/02—Measuring steady of quasi-steady pressure of fluid or fluent solid material by electric or magnetic pressure-sensitive elements; Transmitting or indicating the displacement of mechanical pressure-sensitive elements, used to measure the steady or quasi-steady pressure of a fluid or fluent solid material, by electric or magnetic means by making use of variations in ohmic resistance, e.g. of potentiometers, electric circuits therefor, e.g. bridges, amplifiers or signal conditioning
- G01L9/06—Measuring steady of quasi-steady pressure of fluid or fluent solid material by electric or magnetic pressure-sensitive elements; Transmitting or indicating the displacement of mechanical pressure-sensitive elements, used to measure the steady or quasi-steady pressure of a fluid or fluent solid material, by electric or magnetic means by making use of variations in ohmic resistance, e.g. of potentiometers, electric circuits therefor, e.g. bridges, amplifiers or signal conditioning of piezo-resistive devices
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Measuring Fluid Pressure (AREA)
Abstract
The utility model provides a pressure transmitter, which comprises a pressure sensor core body for generating differential voltage according to excitation current, a signal transmission processing circuit which is connected with the pressure sensor core body and used for amplifying the differential voltage, outputting a corresponding signal and supplying fixed excitation voltage, and an excitation current generation unit which is connected with the pressure sensor core body and the signal transmission processing circuit and used for generating different excitation currents according to the fixed excitation voltage and different control signals. According to the pressure transmitter, a pressure measuring range is changed by changing the excitation current of the pressure sensor core body; and on the premise that the measurement precision is not changed, an aim of adjusting the pressure measuring range can be fulfilled.
Description
Technical field
The utility model relates to sensor field, is meant a kind of pressure unit especially.
Background technology
Sensor is in scientific research and technological development; Particularly in infotech; Automatic technology in the technology such as modern manufacturing, plays irreplaceable effect; Pressure transducer is the maximum a kind of sensor of present number of applications, is widely used in national defence fields ability and other fields such as industrial circles such as oil, chemical industry, Aeronautics and Astronautics.Along with the continuous development of science and technology, precision height, good stability, volume are little, wide accommodation will be the developing direction of pressure transducer.
In the measurement of the reality of sensor, people often expect that the measurement range (scope) of sensor is very big, and measuring accuracy is high more good more simultaneously, yet for identical sensor, the pressure transducer that range is big more is used for measuring in a small amount that stroke pressure will influence precision.Contradiction will appear in the precision of range for measuring and measurement.The precision that improves sensor is the method that solves this contradiction with the sensor that adopts a plurality of different ranges; But all there is certain drawback in this type mode; For improving precision; Because technology and technology limitation, be limited to the raising of sensor measurement precision, and the raising of precision mean that also manufacturing cost significantly increases; And, measurement component is increased for the mode of the sensor that adopts a plurality of different ranges, it is complicated that signal Processing becomes, and is unfavorable for safeguarding, and in practice, also has difficulties.
The utility model content
The utility model proposes a kind of pressure unit, realizes the change of pressure range under the prerequisite that does not change measuring accuracy, reaching the purpose that can regulate the pressure range through the exciting current that changes the pressure transducer core body.
The technical scheme of the utility model is achieved in that
A kind of pressure unit comprises:
Produce the pressure transducer core body of differential voltage according to exciting current;
Be connected with said pressure transducer core body, export corresponding signal after amplifying said differential voltage, and the signal transmitting treatment circuit of constant excitation voltage can be provided;
Be connected with said signal transmitting treatment circuit with said pressure transducer core body, produce the exciting current generation unit of different exciting currents according to said constant excitation voltage and Different control signal.
Preferably, said exciting current generation unit comprises:
The adjusting resistance of at least two different resistances;
Be connected with said adjusting resistance, select the sheet of the adjusting resistance of different resistances to select switch according to the Different control signal.
Preferably, said exciting current generation unit comprises:
The transformable adjusting resistance of resistance;
Be connected with said adjusting resistance, confirm that according to the Different control signal sheet of the different resistances of said adjusting resistance selects switch.
Preferably, also comprise:
Be connected with said exciting current generation unit, produce the control signal input block of different control signals.
Preferably, said control signal input block is specially the control signal incoming line according to the different control signals of combination results of high-low level.
Preferably, said pressure transducer core body is specially the resistance bridge of being made up of silicon diaphragm.
The utility model technical scheme produces different exciting currents through the exciting current generation unit; Thereby can realize the change of pressure range through the exciting current that changes the pressure transducer core body; Under the prerequisite that does not change measuring accuracy, reach the purpose that to regulate the pressure range.
Description of drawings
In order to be illustrated more clearly in the utility model embodiment or technical scheme of the prior art; To do to introduce simply to the accompanying drawing of required use in embodiment or the description of the Prior Art below; Obviously, the accompanying drawing in describing below only is some embodiment of the utility model, for those of ordinary skills; Under the prerequisite of not paying creative work property, can also obtain other accompanying drawing according to these accompanying drawings.
Fig. 1 is the structural representation of a kind of pressure unit preferred embodiment of the utility model;
Fig. 2 is the electrical relation synoptic diagram of an instantiation of a kind of pressure unit of the utility model.
Embodiment
To combine the accompanying drawing among the utility model embodiment below, the technical scheme among the utility model embodiment is carried out clear, intactly description, obviously, described embodiment only is the utility model part embodiment, rather than whole embodiment.Based on the embodiment in the utility model, those of ordinary skills are not making the every other embodiment that is obtained under the creative work prerequisite, all belong to the scope of the utility model protection.
Pressure unit mainly is made up of pressure transducer core body and sensor signal conditioning device (signal transmitting treatment circuit) and some external circuitses.Sensor core can be a resistance bridge or other pressure drag core body, and for Hui Sidun pressure drag core body, its output differential voltage has the relation of U0=Δ RIA; Wherein Δ R is the changing value that is caused bridge resistance by pressure; Be directly proportional with the pressure range, have the highly linear degree, IA is the exciting current of electric bridge; U0 is the differential signal (differential voltage) of sensor core output; This relational expression shows that sensor core output differential voltage is directly proportional with the size of pressure, exciting current, and the utility model is adjusted the pressure range of pressure unit through adjustment exciting current IA.
With reference to Fig. 1, in first embodiment of a kind of pressure unit of the utility model, said pressure unit comprises pressure transducer core body 110, signal transmitting treatment circuit 120 and exciting current generation unit 130.
Said pressure transducer core body 110 produces differential voltage according to exciting current; The output and the exciting current that are said pressure transducer core body 110 are closing; Its concrete relational expression is: differential voltage U0=Δ RIA, and wherein Δ R is the changing value that is caused bridge resistance by pressure, is directly proportional with the pressure range; Have the highly linear degree, IA is the exciting current of electric bridge.In a preferred embodiment of the utility model; The said pressure transducer core body 110 preferred resistance bridges of forming by four presser sensor resistance that adopt; Certainly; Said pressure transducer core body 110 can also adopt other sensor construction, and the utility model does not carry out any qualification to this.
Said signal transmitting treatment circuit 120 is connected with said pressure transducer core body 110, exports corresponding signal after being used to amplify the differential voltage that said pressure transducer core body 110 produces.
Said signal transmitting treatment circuit 120 can also provide constant excitation voltage, to the power supply of signal transmitting treatment circuit, makes its operate as normal through power supply, and signal transmitting treatment circuit 120 produces a constant excitation voltage.
Said exciting current generation unit 130 is connected with said signal transmitting treatment circuit 120 with said pressure transducer core body 110, is used for producing different exciting currents according to said constant excitation voltage with the Different control signal.
Description through the front can know, different exciting currents can corresponding different pressure ranges, can form different pressure ranges thereby produce different exciting currents.
In a preferred embodiment of the utility model, said exciting current generation unit 130 comprises:
The adjusting resistance of at least two different resistances;
Be connected with said adjusting resistance, select the sheet of the adjusting resistance of different resistances to select switch according to the Different control signal.
In addition, said pressure unit can also comprise:
Be connected with said exciting current generation unit, produce the control signal input block of different control signals.
Wherein, said control signal input block is specially the control signal incoming line according to the different control signals of combination results of high-low level.
Referring to Fig. 2, with an instantiation course of work and the principle of work of said technical scheme are carried out a detailed description below.
In Fig. 2, IN+ be excitation power supply just, IN-is that excitation power supply is negative, INM is the negative input of differential signal, INP is the differential signal positive input.
At first power supply makes its operate as normal to signal transmitting treatment circuit IC0 power supply, and IC0 produces a constant excitation voltage U c, and Uc selects on-off action to regulate on the resistance R n to one of them through sheet; Thereby produce an exciting current IS, IS is inversely proportional to the size of regulating resistance, wherein regulates resistance (R1 ... Rn) selection is selected the switch decision by sheet, and sheet selects switch again by external control signal incoming line (A1 ... An) decision; Be equivalent to a code translator, such as, when A1 and A2 were low level, sheet selected the pin at switch conduction R1 place; Driving voltage Uc acts on the R1, produces a corresponding current IS, IS=Uc/Rn, R2 so ... The pin at Rn place breaks off; As a same reason, when A1 is a low level, when A2 is high level, then R2 place pin conducting; Driving voltage Uc acts on the R2, produces the exciting current of a correspondence, by that analogy; Change the level combination of outside input control signal, may be selected in different adjusting resistance, thereby confirm a suitable exciting current IS.
In Fig. 2, IS=IA is because sensor core resistance bridge of being made up of four presser sensor resistance preferably; Exciting current will produce a positive energize voltage INP and a negative energize voltage INM, INP-INM=U0 through after the sensor core M0; U0 is the differential voltage of sensor core; Differential voltage is input to signal transmitting treatment circuit IC0, after amplifying through inter-process, produces the output signal of a correspondence.
The utility model is regulated resistance through increasing, and forms a constant current source by signal transmitting treatment circuit IC0, sensor core M0 and adjusting resistance.Wherein there is a computing amplification that big electric current can be provided IC0 inside, and M0 just is equivalent to 2 adjustment resistance of amplifier with adjusting resistance, equates with the Rn current IS that flows through adjusting resistance so flow through the electric current I A of M0.Because IS=Uc/Rn, i.e. IA=Uc/Rn.In the formula, Uc is invariable.Electric current I A is inversely proportional to the resistance Rn that regulates resistance like this, and U0=Δ RUc/Rn=INP-INM is then arranged, and wherein U0 is the differential voltage of sensor core, and differential voltage gets into after the IC0, through becoming big processing that veer away, forms the output signal of transmitter at last.Confirm that through external interface control line A1 to An sheet selects switch S 0 to be electrically connected with different adjusting resistance R 1 to Rn in the circuit, come transmitter is selected different adjusting resistance R n.
Relation is as follows between range and the differential voltage:
………………………………；
Wherein, R1, R2 ... Rn is for regulating resistance.
Range derivation formula according to top can be known; It all is the same making the differential signal that under the different pressures range, produces; When the pressure range changed, corresponding ratio takes place resistor bridge Δ R changed, and so corresponding exciting current IA also need make corresponding inverse proportion and change; And exciting current changes through aforesaid switching excitation resistance, thereby reaches the effect of regulating range.
In another embodiment of the utility model, can also use the transformable adjusting resistance of resistance to substitute the adjusting resistance of at least two different resistances.The resistance that is said adjusting resistance can be regulated, and when said constant excitation voltage acts on the adjusting resistance that said resistance can regulate, also can produce different exciting currents, thereby equally can reach the effect of regulating range.
Therefore, in said embodiment, said exciting current generation unit can comprise:
The transformable adjusting resistance of resistance;
Be connected with said adjusting resistance, confirm that according to the Different control signal sheet of the different resistances of said adjusting resistance selects switch.
The utility model technical scheme produces different exciting currents through the exciting current generation unit; Thereby can realize the change of pressure range through the exciting current that changes the pressure transducer core body; Under the prerequisite that does not change measuring accuracy, reach the purpose that to regulate the pressure range.
The above is merely the preferred embodiment of the utility model; Not in order to restriction the utility model; All within the spirit and principle of the utility model, any modification of being done, be equal to replacement, improvement etc., all should be included within the protection domain of the utility model.
Claims (6)
1. a pressure unit is characterized in that, comprising:
Produce the pressure transducer core body of differential voltage according to exciting current;
Be connected with said pressure transducer core body, export corresponding signal after amplifying said differential voltage, and the signal transmitting treatment circuit of constant excitation voltage can be provided;
Be connected with said signal transmitting treatment circuit with said pressure transducer core body, produce the exciting current generation unit of different exciting currents according to said constant excitation voltage and Different control signal.
2. pressure unit according to claim 1 is characterized in that, said exciting current generation unit comprises:
The adjusting resistance of at least two different resistances;
Be connected with said adjusting resistance, select the sheet of the adjusting resistance of different resistances to select switch according to the Different control signal.
3. pressure unit according to claim 1 is characterized in that, said exciting current generation unit comprises:
The transformable adjusting resistance of resistance;
Be connected with said adjusting resistance, confirm that according to the Different control signal sheet of the different resistances of said adjusting resistance selects switch.
4. according to each described pressure unit of claim 1 to 3, it is characterized in that, also comprise:
Be connected with said exciting current generation unit, produce the control signal input block of different control signals.
5. pressure unit according to claim 4 is characterized in that, said control signal input block is specially the control signal incoming line according to the different control signals of combination results of high-low level.
6. pressure unit according to claim 5 is characterized in that, said pressure transducer core body is specially the resistance bridge of being made up of silicon diaphragm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201120348800 CN202305072U (en) | 2011-05-06 | 2011-09-16 | Pressure transmitter |
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201110116324 | 2011-05-06 | ||
| CN201110116324.8 | 2011-05-06 | ||
| CN 201120348800 CN202305072U (en) | 2011-05-06 | 2011-09-16 | Pressure transmitter |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202305072U true CN202305072U (en) | 2012-07-04 |
Family
ID=45577107
Family Applications (2)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201120348800 Expired - Fee Related CN202305072U (en) | 2011-05-06 | 2011-09-16 | Pressure transmitter |
| CN 201110276503 Expired - Fee Related CN102353496B (en) | 2011-05-06 | 2011-09-16 | Pressure transmitter |
Family Applications After (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201110276503 Expired - Fee Related CN102353496B (en) | 2011-05-06 | 2011-09-16 | Pressure transmitter |
Country Status (2)
| Country | Link |
|---|---|
| CN (2) | CN202305072U (en) |
| WO (1) | WO2012152172A1 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102353496A (en) * | 2011-05-06 | 2012-02-15 | 三一重工股份有限公司 | Pressure transmitter |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107607251B (en) * | 2017-09-08 | 2024-05-14 | 上海工业自动化仪表研究院有限公司 | Differential pressure or pressure transmitter with double measuring ranges |
| CN111325964B (en) * | 2020-03-11 | 2021-08-13 | 江阴长仪集团有限公司 | Wireless module for intelligent electric energy meter and automatic code pairing method |
Family Cites Families (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4414853A (en) * | 1981-08-10 | 1983-11-15 | The Foxboro Company | Pressure transmitter employing non-linear temperature compensation |
| JPS58109811A (en) * | 1981-12-24 | 1983-06-30 | Toshiba Corp | Pressure transmitting device |
| CN85104807B (en) * | 1985-06-02 | 1986-08-06 | 哈尔滨工业大学 | Multi-range load cell |
| JPH06229862A (en) * | 1993-02-02 | 1994-08-19 | Yamatake Honeywell Co Ltd | Pressure sensor |
| JP2000241271A (en) * | 1999-02-24 | 2000-09-08 | Nippon Seiki Co Ltd | Pressure detector |
| JP2003065867A (en) * | 2001-08-27 | 2003-03-05 | Nippon Seiki Co Ltd | Semiconductor sensor device |
| US6870236B2 (en) * | 2003-05-20 | 2005-03-22 | Honeywell International, Inc. | Integrated resistor network for multi-functional use in constant current or constant voltage operation of a pressure sensor |
| CN101236113B (en) * | 2007-02-01 | 2011-03-16 | 上海飞恩微电子有限公司 | All-bridge type piezoresistance type pressure sensor digital type signal conditioning chip |
| CN202305072U (en) * | 2011-05-06 | 2012-07-04 | 三一重工股份有限公司 | Pressure transmitter |
-
2011
- 2011-09-16 CN CN 201120348800 patent/CN202305072U/en not_active Expired - Fee Related
- 2011-09-16 CN CN 201110276503 patent/CN102353496B/en not_active Expired - Fee Related
-
2012
- 2012-04-18 WO PCT/CN2012/074295 patent/WO2012152172A1/en active Application Filing
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102353496A (en) * | 2011-05-06 | 2012-02-15 | 三一重工股份有限公司 | Pressure transmitter |
Also Published As
| Publication number | Publication date |
|---|---|
| CN102353496B (en) | 2013-12-18 |
| CN102353496A (en) | 2012-02-15 |
| WO2012152172A1 (en) | 2012-11-15 |
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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: 20120704 Termination date: 20140916 |
|
| EXPY | Termination of patent right or utility model |