CN205958171U - Pressure transmitter with current -limiting protection - Google Patents
Pressure transmitter with current -limiting protection Download PDFInfo
- Publication number
- CN205958171U CN205958171U CN201620879501.6U CN201620879501U CN205958171U CN 205958171 U CN205958171 U CN 205958171U CN 201620879501 U CN201620879501 U CN 201620879501U CN 205958171 U CN205958171 U CN 205958171U
- Authority
- CN
- China
- Prior art keywords
- pressure
- circuit
- current
- branch road
- signal processing
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
- 238000012545 processing Methods 0.000 claims abstract description 26
- 238000009530 blood pressure measurement Methods 0.000 claims description 15
- 230000005669 field effect Effects 0.000 claims description 15
- 230000003750 conditioning effect Effects 0.000 claims description 6
- 230000003321 amplification Effects 0.000 claims description 3
- 238000002955 isolation Methods 0.000 claims description 3
- 238000003199 nucleic acid amplification method Methods 0.000 claims description 3
- 230000005611 electricity Effects 0.000 claims description 2
- 238000006243 chemical reaction Methods 0.000 abstract description 2
- 238000000034 method Methods 0.000 description 6
- 239000007788 liquid Substances 0.000 description 5
- 238000005259 measurement Methods 0.000 description 5
- 230000006378 damage Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000011160 research Methods 0.000 description 2
- 230000003068 static effect Effects 0.000 description 2
- 240000007594 Oryza sativa Species 0.000 description 1
- 235000007164 Oryza sativa Nutrition 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000012937 correction Methods 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 235000009566 rice Nutrition 0.000 description 1
Landscapes
- Measuring Fluid Pressure (AREA)
Abstract
The utility model discloses a pressure transmitter with current -limiting protection, pressure sensing circuit, AD conversion module, processing circuit and the connection external interface on processing circuit including connecting gradually still includes the supply circuit who provides working power supply for processing circuit, be connected with the current -limiting circuit between supply circuit and the processing circuit.
Description
Technical field
This utility model is related to pressure transmitter field, in particular it relates to have the pressure transmitter of current-limiting protection.
Background technology
Pressure transmitter is used in pressure monitoring system, when the pressure change in system, produces detection signal, Jing Guoxin
Number process circuit, is changed into corresponding analog voltage and current signal, or corresponding according to different alarm point setting output
Alarm signal, the pressure for detecting system and protection system.Existing pressure transmitter, is powered using power supply, is powering
Cheng Zhong, when excessively stream is powered, easily build-up of pressure transmitter is unstable, and easily pressure transmitter is damaged.
Hydraulic measurement occasion, the required precision to pressure transmitter having is very high.And existing pressure transmitter, improve
Its precision, often sets about on pressure transducer or signal processing circuit is set about, to improve the precision of pressure detecting.But,
With going deep into of research, bottleneck stage has been arrived in the research of these two aspects.
Now, our company works out a kind of method, when measuring hydraulic pressure, by two highly different pressure transducers,
Both differences in height are certain, and that is, in same liquid, both pressure differentials are certain, by the detected value of two pressure transducers to it
Actual measurement difference is judged, if actual measurement difference is equal with original difference, using the detected value of original high stress sensor, if
Actual measurement difference and original difference, then using the difference between actual measurement difference and original difference to original high stress sensor
Detected value revised.Can achieve the high-acruracy survey of detected pressure value based on said method.But, existing wireless pressure becomes
Send device to lack concrete structure said method is supported.
Utility model content
This utility model provides a kind of pressure transmitter with current-limiting protection to solve above-mentioned technical problem.
The technical scheme in the invention for solving the above technical problem is：
There is the pressure transmitter of current-limiting protection it is characterised in that：Including signal processing circuit and be connected to signal processing
First pressure measurement branch road on circuit and second pressure measurement branch road, described first pressure measurement branch road and second pressure measurement
Branch road all includes pressure transducer, signal conditioning circuit and the A/D change-over circuit being sequentially connected, and described first pressure measures branch road
The pressure transducer measuring branch road with second pressure is located at differing heights, and described signal processing circuit is connected with power supply circuits,
It is connected current limit circuit between described power supply circuits and signal processing circuit.This utility model is on the basis of available circuit structure
At least do following improvement, in signal processing circuit, connected current-limiting circuit, using current-limiting circuit, excessively stream is protected, keep away
Exempt from the destruction to signal processing circuit for the excessively stream；And two pressure measxurement branch roads are set, right respectively using two pressure measxurement branch roads
The pressure of different height and positions measures, and wherein the pressure transducer of a branch road is located at height to be measured, is said method
Hardware foundation is provided.Pressure sensor circuit directly acts on measurand to detect pressure, and A/D modular converter enters to this detected value
It is sent to signal processing circuit after row conversion to be processed.
Preferably, described current-limiting circuit includes, and one end is connected to power supply circuits outfan and the other end connects scene effect
Current-limiting resistance in pipe drain electrode, the source electrode of described field effect transistor is connected with signal processing circuit power end, the two ends of described resistance
It is connected on two inputs of comparator, described stronger outfan is connected on the grid of field effect transistor.This programme
Current-limiting circuit utilize field effect transistor constitute current limliting switching tube, resistance plays metering function, when its electric current is excessive, resistance two ends
Pressure reduction increases and promotes comparator to send signal to reach metering function to turn off field effect transistor.
Further, described field effect transistor is P-channel field-effect transistor (PEFT) pipe.
Preferably, described signal conditioning circuit includes filter circuit, signal amplification circuit and the isolation electricity being sequentially connected
Road.
Preferably, described first pressure measures the difference in height position of the pressure transducer of branch road and second pressure measurement branch road
Between 1 centimetre to 10 centimetres.When the pressure to liquid differing heights measures, if liquid remains static, right
The pressure differential of certain altitude does not affect, but, when liquid is not static, and when there is certain mobility, can be to this height
Between pressure differential impact, therefore in order to reduce the liquid error brought of flowing, first pressure is measured branch road and the second pressure
Power measures the as little as possible of the difference in height setting of the pressure transducer of branch road, but, when too small, both it had been not easy to pressure transducer
Lay, also do not meet above-mentioned data correction thought.
To sum up, the beneficial effects of the utility model are：
This utility model connects current-limiting circuit in signal processing circuit, using current-limiting circuit, excessively stream is protected, and keeps away
Exempt from the destruction to signal processing circuit for the excessively stream, strengthen the overcurrent protection of pressure transmitter；And on the basis of existing structure, increasing
If a pressure measxurement branch road, and the pressure transducer of two pressure measxurement branch roads is made to be located at different height, its high precision, and
There is provided hardware foundation for said method.
Brief description
Fig. 1 is the schematic diagram of this utility model current-limiting circuit.
Specific embodiment
With reference to embodiment and accompanying drawing, the technical scheme in this utility model embodiment is clearly and completely retouched
State it is clear that described embodiment is only a part of embodiment of this utility model, rather than whole embodiments.Based on this reality
With the embodiment in new, it is every other that those of ordinary skill in the art are obtained under the premise of not making creative work
Embodiment, broadly falls into the scope of this utility model protection.
Embodiment 1：
A kind of pressure transmitter with current-limiting protection as shown in Figure 1 it is characterised in that：Including signal processing circuit and
It is connected to the first pressure measurement branch road in signal processing circuit and second pressure measurement branch road, described first pressure measures branch road
Measure branch road with second pressure and all include the pressure transducer, signal conditioning circuit and the A/D change-over circuit that are sequentially connected, described the
One pressure measxurement branch road and second pressure measure the pressure transducer of branch road positioned at differing heights, and described signal processing circuit connects
It is connected to power supply circuits, between described power supply circuits and signal processing circuit, be connected current limit circuit.Wherein signal processing circuit master
Master controller to be included and the wireless signal receiving circuit being connected on master controller.
Embodiment 2：
A kind of pressure transmitter with current-limiting protection as shown in Figure 1, the present embodiment is on the basis of above-described embodiment
Current-limiting circuit is refined, that is, described current-limiting circuit include one end be connected to power supply circuits outfan and the other end connect on the scene
Current-limiting resistance in the drain electrode of effect pipe, the source electrode of described field effect transistor is connected with signal processing circuit power end, described resistance
Two ends are connected on two inputs of comparator, and described stronger outfan is connected on the grid of field effect transistor.
Described field effect transistor is P-channel field-effect transistor (PEFT) pipe.
Described signal conditioning circuit includes filter circuit, signal amplification circuit and the isolation circuit being sequentially connected.
Embodiment 3：
A kind of pressure transmitter with current-limiting protection as shown in Figure 1, the present embodiment is on the basis of above-described embodiment
Optimize, that is, described first pressure measures the difference in height of the pressure transducer of branch road and second pressure measurement branch road positioned at 1 li
Rice is between 10 centimetres.
Preferably may be configured as 4 centimetres.
As described above, this utility model can preferably be realized.
Claims (5)
1. there is the pressure transmitter of current-limiting protection it is characterised in that：Including signal processing circuit and be connected to signal processing electricity
First pressure measurement branch road on road and second pressure measurement branch road, described first pressure measurement branch road and second pressure measurement
Road all includes pressure transducer, signal conditioning circuit and the A/D change-over circuit being sequentially connected, described first pressure measurement branch road and
The pressure transducer that second pressure measures branch road is located at differing heights, and described signal processing circuit is connected with power supply circuits, institute
State and between power supply circuits and signal processing circuit, be connected current limit circuit.
2. the pressure transmitter with current-limiting protection according to claim 1 it is characterised in that：Described current-limiting circuit includes
One end is connected to the current-limiting resistance that power supply circuits outfan and the other end are connected in field effect transistor drain electrode, described field effect transistor
Source electrode is connected with signal processing circuit power end, and the two ends of described resistance are connected on two inputs of comparator, described
The outfan of comparator is connected on the grid of field effect transistor.
3. the pressure transmitter with current-limiting protection according to claim 2 it is characterised in that：Described field effect transistor is P
Channel field-effect pipe.
4. the pressure transmitter with current-limiting protection according to claim 1 it is characterised in that：Described signal conditioning circuit
Including the filter circuit being sequentially connected, signal amplification circuit and isolation circuit.
5. the pressure transmitter with current-limiting protection according to claim 1 it is characterised in that：Described first pressure measurement
Between the difference in height of the pressure transducer of branch road and second pressure measurement branch road is located at 1 centimetre to 10 centimetres.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620879501.6U CN205958171U (en) | 2016-08-15 | 2016-08-15 | Pressure transmitter with current -limiting protection |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620879501.6U CN205958171U (en) | 2016-08-15 | 2016-08-15 | Pressure transmitter with current -limiting protection |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN205958171U true CN205958171U (en) | 2017-02-15 |
Family
ID=57974471
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201620879501.6U Expired - Fee Related CN205958171U (en) | 2016-08-15 | 2016-08-15 | Pressure transmitter with current -limiting protection |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN205958171U (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106052949A (en) * | 2016-08-15 | 2016-10-26 | 成都众山科技有限公司 | Pressure transmitter with function of current limiting protection |
| CN109297633A (en) * | 2018-09-29 | 2019-02-01 | 宁波中车时代传感技术有限公司 | Pressure transmitter is used in a kind of monitoring of Cooling Water of Diesel Locomotive system pressure |
| CN110907072A (en) * | 2019-11-14 | 2020-03-24 | 天津航空机电有限公司 | A pressure transmitter circuit with hysteresis switch |
-
2016
- 2016-08-15 CN CN201620879501.6U patent/CN205958171U/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106052949A (en) * | 2016-08-15 | 2016-10-26 | 成都众山科技有限公司 | Pressure transmitter with function of current limiting protection |
| CN109297633A (en) * | 2018-09-29 | 2019-02-01 | 宁波中车时代传感技术有限公司 | Pressure transmitter is used in a kind of monitoring of Cooling Water of Diesel Locomotive system pressure |
| CN109297633B (en) * | 2018-09-29 | 2021-04-06 | 宁波中车时代传感技术有限公司 | Pressure transmitter for monitoring pressure of cooling water system of diesel locomotive |
| CN110907072A (en) * | 2019-11-14 | 2020-03-24 | 天津航空机电有限公司 | A pressure transmitter circuit with hysteresis switch |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN207742258U (en) | A kind of loop resistance detection device for high-voltage circuitbreaker | |
| CN202928716U (en) | High precision intelligent temperature measurement circuit | |
| CN205958171U (en) | Pressure transmitter with current -limiting protection | |
| CN102692883B (en) | An analog input circuit for engineering-machinery-dedicated controller | |
| CN104075841B (en) | aircraft engine pressure sensor detection circuit | |
| CN202281802U (en) | Three-phase three-wire electric energy meter | |
| CN202511939U (en) | Signal conditioning circuit of 0-5V output pressure sensor | |
| CN205176136U (en) | Resistance test device | |
| CN203587701U (en) | Online detection circuit for photovoltaic inverter ground insulation resistance | |
| CN102866358B (en) | High-string-number lithium-battery pack voltage detection circuit and battery pack protection circuit utilizing same | |
| CN104730215A (en) | Gas detection digital bridge and detection processing method thereof | |
| CN104155508B (en) | Signal current detection device and method of OLED CELL detection equipment | |
| CN101651084B (en) | Electrostatic chuck supply current sampling device, method and plasma device | |
| CN102288337B (en) | Method and device for measuring differential resistance type sensor | |
| CN100573076C (en) | A kind of crossbeam type oil pumping machine feed sensor calibration system and scaling method thereof | |
| CN201421653Y (en) | A wireless data collector | |
| CN203981772U (en) | The marking current pick-up unit of OLED CELL checkout equipment | |
| CN102778327A (en) | High-performance intelligent sensor digital transmitting system | |
| CN202362263U (en) | Novel intelligent gas detector | |
| CN106052949A (en) | Pressure transmitter with function of current limiting protection | |
| CN201184835Y (en) | Calibration system for load sensor of crossbeam type oil pumping machine | |
| CN205982390U (en) | Adopt linear optical coupling to carry out device of high voltage DC sampling | |
| CN206038759U (en) | New forms of energy electric automobile high accuracy current detection circuit | |
| CN204989389U (en) | Earth fault positioning circuit of direct current test system | |
| CN212083538U (en) | Voltage and current calibration detection device with constant voltage output function |
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: 20170215 Termination date: 20170815 |
|
| CF01 | Termination of patent right due to non-payment of annual fee |