CN107870017A - Micro energy lose tide fluid level transmitter and its used tide level measuring method - Google Patents
Micro energy lose tide fluid level transmitter and its used tide level measuring method Download PDFInfo
- Publication number
- CN107870017A CN107870017A CN201610855389.7A CN201610855389A CN107870017A CN 107870017 A CN107870017 A CN 107870017A CN 201610855389 A CN201610855389 A CN 201610855389A CN 107870017 A CN107870017 A CN 107870017A
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- Prior art keywords
- chip microcomputer
- tide
- converter
- fluid level
- pressure sensor
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Classifications
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
- G01F23/00—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm
- G01F23/14—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm by measurement of pressure
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01C—MEASURING DISTANCES, LEVELS OR BEARINGS; SURVEYING; NAVIGATION; GYROSCOPIC INSTRUMENTS; PHOTOGRAMMETRY OR VIDEOGRAMMETRY
- G01C13/00—Surveying specially adapted to open water, e.g. sea, lake, river or canal
- G01C13/008—Surveying specially adapted to open water, e.g. sea, lake, river or canal measuring depth of open water
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Life Sciences & Earth Sciences (AREA)
- Hydrology & Water Resources (AREA)
- Engineering & Computer Science (AREA)
- Radar, Positioning & Navigation (AREA)
- Remote Sensing (AREA)
- Fluid Mechanics (AREA)
- Arrangements For Transmission Of Measured Signals (AREA)
Abstract
The invention belongs to fluid level transmitter field, more particularly to a kind of micro energy lose tide fluid level transmitter and its used tide level measuring method, including pressure sensor, a/d converter, single-chip microcomputer, RS485 interfaces and power supply voltage stabilization part；The RS485 interfaces connect the signal transmission port of single-chip microcomputer；The signal transmission port of the single-chip microcomputer connects a/d converter and pressure sensor respectively；The signal transmission port of pressure sensor connects the signal transmission port of a/d converter.Transmitter is usually in low power consumption standby state, is activated the single-chip microcomputer in power-down state by the instruction that RS485 interfaces are sent, transmitter is in low power consumption standby state again after single-chip microcomputer Control peripheral circuit performs measurement and communication operation.The present invention saves electric energy, and networking is convenient, the occasion for being adapted to dry cell continuously to power for a long time, can significantly extend the service life of battery, reduce later stage use cost.
Description
Technical field
The invention belongs to fluid level transmitter field, more particularly to it is a kind of be used to measuring tide liquid level have micro energy lose feature and
The fluid level transmitter of RS485 communication functions and its used tide level measuring method.
Background technology
Fluid level transmitter is the extension and development to pressure transmitter technology, according to the liquid of different specific weight in different height
The linear principle of produced pressure, realize the volume to water, oil and pastel, liquid height, the accurate measurement and biography of weight
Send.
At present, known fluid level transmitter has following a few classes.
The first kind：Powered using dc source, there is provided 4~20mA of two-wire system electric currents export.The output letter of this transmitter
Number need separate cabling, it is impossible to interconnect.The characteristics of current signal, prevents wiring distance from long, to be otherwise easily interfered.
Such transmitter will carry out Current Voltage conversion in receiving terminal, can bring additive error, therefore its measurement accuracy is restricted, generally
0.5% or so.In addition, operating current is at least 4mA, the requirement of low-power consumption can not be met, be not suitable for using battery powered.
Second class：Powered using dc source, there is provided RS485 communication signals export.This transmitter wiring is more convenient,
Multiple transmitters can be connected to by universal serial bus in a network, while antijamming capability is stronger, but such transmitter
In instantaneous operating conditions, the operating current of transmitter is larger, generally reaches mA magnitudes, therefore is not suitable for using battery powered.
The content of the invention
It is contemplated that providing a kind of saving electric energy in place of overcome the deficiencies in the prior art, networking is convenient, is adapted to dry electricity
It the occasion that pond continuously powers for a long time, can significantly extend the service life of battery, reduce the micro energy lose tide of later stage use cost
Fluid level transmitter.
The present invention also provides tide level measuring method used by a kind of micro energy lose tide fluid level transmitter.
In order to solve the above technical problems, what the present invention was realized in.
Micro energy lose tide fluid level transmitter, including pressure sensor, a/d converter, single-chip microcomputer, RS485 interfaces and power supply are steady
Laminate section；The RS485 interfaces connect the signal transmission port of single-chip microcomputer；The signal transmission port of the single-chip microcomputer meets AD and turned respectively
Parallel operation and pressure sensor；The signal transmission port of the pressure sensor connects the signal transmission port of a/d converter；The electricity
Source voltage stabilization part is single-chip microcomputer, a/d converter and RS485 interfaces provide power supply.
As a kind of preferred scheme, pressure sensor of the present invention uses pressure resistance type gauge pressure transducer chip TS86.
Further, a/d converter of the present invention uses ADS1247 chips.
Further, RS485 interfaces of the present invention use MAX3471 chips.
Further, single-chip microcomputer of the present invention uses STM8L051 chips.
Further, power supply voltage stabilization part of the present invention uses LDO voltage stabilizing chips.
Tide level measuring method used by above-mentioned micro energy lose tide fluid level transmitter, it can carry out as follows.
（1）In the standby state, single-chip microcomputer and a/d converter are in micro energy lose power down operations pattern, and internal clocking stops,
Retain internal RAM data, pressure sensor power-off, RS485 interfaces are in low-power consumption and receive wait state.
（2）Host computer sends instruction, RS485 interface outputting data signals；Monolithic machine testing corresponding signal, trigger in outside
Break to wake up single-chip microcomputer.
（3）Single-chip microcomputer receives serial data, after obtaining effective instruction, starts pressure sensor power supply, wakes up a/d converter,
Complete a perfect measurement process.
（4）After measurement terminates, closing presure probe power, a/d converter is reset into power-down state, then carry out data
Calculate, and measurement result is sent to host computer by RS485 interfaces；
（5）After communication terminates, single-chip microcomputer reenters power-down state.
Step of the present invention（1）Operating current be less than or equal to 10uA；The step（3）Operating current be 1mA；Institute
State step（4）Operating current be 20mA.
The present invention saves electric energy, and networking is convenient, the occasion for being adapted to dry cell continuously to power for a long time, can significantly extend battery
Service life, reduce later stage use cost.In actual applications, micro energy lose tide fluid level transmitter of the present invention works in open country
Outside, powered using disposable battery, by the way of interval measures, transmitter it is low in energy consumption, can meet that battery is long-term use of
It is required that.Meanwhile the present invention can use RS485 mode output datas, networking is conveniently.
Brief description of the drawings
The invention will be further described with reference to the accompanying drawings and detailed description.Protection scope of the present invention not only office
It is limited to the statement of following content.
Fig. 1 is the theory diagram of micro energy lose tide fluid level transmitter of the present invention.
Fig. 2 is the circuit theory diagrams of micro energy lose tide fluid level transmitter of the present invention.
Fig. 3 is tide level measuring method FB(flow block) of the present invention.
Embodiment
As shown in figure 1, micro energy lose tide fluid level transmitter, including pressure sensor, a/d converter, single-chip microcomputer, RS485 connect
Mouth and power supply voltage stabilization part；The RS485 interfaces connect the signal transmission port of single-chip microcomputer；The signal transmission port of the single-chip microcomputer
A/d converter and pressure sensor are connect respectively；The signal transmission port of the pressure sensor connects the signal transmission end of a/d converter
Mouthful；The power supply voltage stabilization part is single-chip microcomputer, a/d converter and RS485 interfaces provide power supply.
Shown in Figure 2, pressure sensor of the present invention uses pressure resistance type gauge pressure transducer chip TS86.Institute of the present invention
State a/d converter and use ADS1247 chips.RS485 interfaces of the present invention use MAX3471 chips.Single-chip microcomputer of the present invention
Using STM8L051 chips.Power supply voltage stabilization part of the present invention uses LDO voltage stabilizing chips.
It is shown in Figure 3, tide level measuring method used by above-mentioned micro energy lose tide fluid level transmitter, by following step
It is rapid to carry out.
（1）In the standby state, single-chip microcomputer and a/d converter are in micro energy lose power down operations pattern, and internal clocking stops,
Retain internal RAM data, pressure sensor power-off, RS485 interfaces are in low-power consumption and receive wait state.
（2）Host computer sends instruction, RS485 interface outputting data signals；Monolithic machine testing corresponding signal, trigger in outside
Break to wake up single-chip microcomputer.
（3）Single-chip microcomputer receives serial data, after obtaining effective instruction, starts pressure sensor power supply, wakes up a/d converter,
Complete a perfect measurement process.
（4）After measurement terminates, closing presure probe power, a/d converter is reset into power-down state, then carry out data
Calculate, and measurement result is sent to host computer by RS485 interfaces.
（5）After communication terminates, single-chip microcomputer reenters power-down state.
Step of the present invention（1）Operating current be less than or equal to 10uA；The step（3）Operating current be 1mA；Institute
State step（4）Operating current be 20mA.
Transmitter of the present invention is usually in low power consumption standby state, and the instruction sent by RS485 interfaces will be in power down
The single-chip microcomputer activation of state, single-chip microcomputer Control peripheral circuit are in low power consumption standby shape again after performing measurement and communication operation
State.
Power supply of the present invention is powered through micro energy lose LDO voltage stabilizing chips to circuit, and the output voltage of the chip is 3.3V；It is single
Piece machine is using the chip for possessing internal RC oscillators；A/d converter uses the chip with power down operations pattern；RS485 interfaces are adopted
With the chip of micro energy lose.The power supply of pressure sensor chip is controlled by single-chip microcomputer.
Single-chip microcomputer of the present invention uses STM8L051 chips；A/d converter uses ADS1247 chips；RS485 interfaces use
MAX3471；Strain gauge is TS86；Power supply voltage stabilizing chip is HT7533.
Circuit side connector face, external power input VPP pass through protection circuit and filter circuit to be followed by the defeated of LDO voltage stabilizing chips
Enter end, the output of LDO voltage stabilizing chips is main power source, there is provided use to single-chip microcomputer, a/d converter and RS485 interfaces.Pressure sensing
The positive supply of device is connect on some I/O port of single-chip microcomputer, therefore can conveniently realize on/off control.
In the standby state, single-chip microcomputer and a/d converter are in micro energy lose power down operations pattern.Single-chip microcomputer internal clocking stops
Only, but internal RAM data still retains, and can pass through external interrupt wakeup.Pressure sensor power supply is turned off to save
Electric energy.RS485 interfaces are in low-power consumption and receive wait state.Now transmitter consumption electric current is extremely low, close to zero-power.
After host computer sends instruction, RS485 interface outputting data signals.The data of serial communication are arrived with high level
Low level transition edges starting, single-chip microcomputer detect the level skip signal, trigger external interrupt so as to wake up single-chip microcomputer.It is single
Piece machine receives serial data, after obtaining effective instruction, opens pressure sensor power supply, by wake instruction a/d converter, completes
Once complete measurement process.Closing presure probe power after measurement terminates, a/d converter is reset by instructing
For power-down state, then carry out the calculating of data and measurement result is sent to host computer by RS485 interfaces.Communication terminate with
Afterwards, single-chip microcomputer reenters power-down state, and at this moment whole transmitter is in low power consumption standby state again.
In workflow more than, transmitter is usually in low power consumption standby state, only when responding host computer instruction
Complete measurement communication operation.Because liquid level signal change is slow, it is generally spaced several minutes or even one hour and just measures once, so
Most time transmitters are in holding state.Power consumption is close to zero under transmitter holding state（Less than or equal to 10uA）,
Main power consumption process is to measure and communicated.After transmitter wakes up, power consumption 1mA, used time 500mS when performing measurement operation；Communication
When operating current be 20mA, used time 25mS.In the case of pressure change is slow, data can be read with proper extension host computer
Cycle, if every 10 minutes read a liquid level data, the average current of transmitter is about 11.7uA（If standby power consumption is
10uA）, it is only more slightly higher than standby power consumption.The lithium battery of 2000mAH capacity is such as used, then can be used continuously 19.5.
Shown in Figure 2, U1 is pressure sensor, and U2 is a/d converter, and U3 is single-chip microcomputer, and U4 is RS485 interface communications
Chip, UP1 are power supply voltage stabilizing chip.
Shown in Figure 1, transmitter is mainly steady by pressure sensor, a/d converter, single-chip microcomputer, RS485 interfaces and power supply
Volt circuit forms.The output of power supply stabilization circuit is powered for other circuit parts.
Shown in Figure 2, pressure sensor U1 uses general pressure resistance type gauge pressure transducer chip TS86, and range can root
Selected according to being actually needed；U2 is a/d converter, using the ADS1247 of TI companies；U3 is single-chip microcomputer, using ST uterine contractions
STM8L051F3；U4 is RS485 interface transceiver chips, using MAX3471；Power supply voltage stabilizing chip UP1 uses HT7533.
Specific circuit connecting mode.
Input power VPP connects protection diode D1 positive pole, and D1 negative pole connects UP1 2 pin.UP1 output end voltage VCC
For 3.3V, powered for U2~U4.The input supply voltage scope that VPP allows is 4V~24V.The negative terminal of transmitter power supply is GND.
Pressure sensor has 2 input pins and 2 output pins, and wherein input pin anode YVCC connects the one of single-chip microcomputer
Individual universal I/O port pin（It is PB6 in figure）, controlled and powered by single-chip microcomputer.The output positive and negative terminal of pressure sensor is connected to AD conversion
The input end of analog signal of device.The control signal of a/d converter：ADDO, ADDI, ADRST, ADINT, ADCS, ADCLK and monolithic
The universal I/O port pin connection of machine.The digital power pin DVDD and analog power pin AVDD of a/d converter meet power end VCC.
DGND the and AGND pins of a/d converter are with connecing power supply（GND）.The START pins of a/d converter meet VCC.
The RXD pins connection MAX3471 of single-chip microcomputer RXD pins, TXD pins connect MAX3471 TXD pins.Monolithic
One universal I/O port pin of machine（It is PB7 in figure）MAX3471 RE and DE pins are connected, mould is sent and received for switching
Formula.
The functional pin of above chip can be according to actual PCB wiring need with the annexation of controller general I/O pin
It is adjusted, Fig. 2 is only example.
After upper electricity, single-chip microcomputer carries out necessary initialization operation, and then transmitter enters holding state, waits host computer
Wake instruction.
In the standby state, single-chip microcomputer and a/d converter are in micro energy lose power down operations pattern, and internal clocking stops, still
Internal RAM data still retains, and single-chip microcomputer can pass through external interrupt wakeup；Pressure sensor power-off is to save electricity
Energy；RS485 interface transceivers chip is in low-power consumption and receives wait state, and now consumption electric current is extremely low, close to zero-power.
After host computer sends instruction, RS485 interface transceiver chip outputting data signals.Because the data of serial communication
All be to be originated with high level to low level transition edges, single-chip microcomputer detects the level skip signal, triggering external interrupt from
And wake up single-chip microcomputer.Next single-chip microcomputer receives serial data, after obtaining effective instruction, open pressure sensor power supply, pass through
Wake instruction a/d converter, complete a perfect measurement process.Closing presure probe power after measurement terminates, passes through instruction
A/d converter is re-set as power-down state, then carries out the calculating of data and measurement result is passed through into RS485 interface chips
It is sent to host computer.After communication terminates, single-chip microcomputer reenters power-down state, and at this moment whole transmitter is in micro energy lose again
Holding state.
In workflow more than, transmitter is usually in low power consumption standby state, only when responding host computer instruction
Complete measurement communication operation.Because liquid level signal change is slow, it is generally spaced several minutes or even one hour and just measures once, so
Most time transmitters are in holding state.Power consumption is close to zero under transmitter holding state（Less than or equal to 10uA）,
Main power consumption process is to measure and communicated.After transmitter wakes up, power consumption 1mA, used time 500mS when performing measurement operation；Communication
When operating current be 20mA, used time 25mS.In the case of pressure change is slow, data can be read with proper extension host computer
Cycle, if every 10 minutes read a liquid level data, the average current of transmitter is 11.7uA（If standby power consumption is
10uA）, it is only more slightly higher than standby power consumption.The lithium battery of 2000mAH capacity is such as used, then can be used continuously 19.5.
The preferred embodiments of the present invention are the foregoing is only, are not intended to limit the invention, for the skill of this area
For art personnel, the present invention can have various modifications and variations.Within the spirit and principles of the invention, that is made any repaiies
Change, equivalent substitution, improvement etc., should be included in the scope of the protection.
Claims (8)
- A kind of 1. micro energy lose tide fluid level transmitter, it is characterised in that including pressure sensor, a/d converter, single-chip microcomputer, RS485 interfaces and power supply voltage stabilization part；The RS485 interfaces connect the signal transmission port of single-chip microcomputer；The signal of the single-chip microcomputer Transmission port connects a/d converter and pressure sensor respectively；The signal transmission port of the pressure sensor connects the letter of a/d converter Number transmission port；The power supply voltage stabilization part is single-chip microcomputer, a/d converter and RS485 interfaces provide power supply.
- 2. micro energy lose tide fluid level transmitter according to claim 1, it is characterised in that：The pressure sensor is using pressure Resistive gauge pressure transducer chip TS86.
- 3. micro energy lose tide fluid level transmitter according to claim 2, it is characterised in that：The a/d converter uses ADS1247 chips.
- 4. micro energy lose tide fluid level transmitter according to claim 3, it is characterised in that：The RS485 interfaces use MAX3471 chips.
- 5. micro energy lose tide fluid level transmitter according to claim 4, it is characterised in that：The single-chip microcomputer uses STM8L051 chips.
- 6. micro energy lose tide fluid level transmitter according to claim 5, it is characterised in that：The power supply voltage stabilization part uses LDO voltage stabilizing chips.
- 7. tide level measuring method used by a kind of micro energy lose tide fluid level transmitter as described in claim 1~6 is any, Characterized in that, carry out as follows：（1）In the standby state, single-chip microcomputer and a/d converter are in micro energy lose power down operations pattern, and internal clocking stops, and retains Internal RAM data, pressure sensor power-off, RS485 interfaces are in low-power consumption and receive wait state；（2）Host computer sends instruction, RS485 interface outputting data signals；Monolithic machine testing corresponding signal, triggering external interrupt with Wake up single-chip microcomputer；（3）Single-chip microcomputer receives serial data, after obtaining effective instruction, starts pressure sensor power supply, wakes up a/d converter, completes Perfect measurement process；（4）After measurement terminates, closing presure probe power, a/d converter is reset into power-down state, then carries out data calculating, And measurement result is sent to host computer by RS485 interfaces；（5）After communication terminates, single-chip microcomputer reenters power-down state.
- 8. tide level measuring method used by micro energy lose tide fluid level transmitter according to claim 7, its feature It is：The step（1）Operating current be less than or equal to 10uA；The step（3）Operating current be 1mA；The step（4） Operating current be 20mA.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610855389.7A CN107870017A (en) | 2016-09-28 | 2016-09-28 | Micro energy lose tide fluid level transmitter and its used tide level measuring method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610855389.7A CN107870017A (en) | 2016-09-28 | 2016-09-28 | Micro energy lose tide fluid level transmitter and its used tide level measuring method |
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| Publication Number | Publication Date |
|---|---|
| CN107870017A true CN107870017A (en) | 2018-04-03 |
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ID=61752307
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201610855389.7A Pending CN107870017A (en) | 2016-09-28 | 2016-09-28 | Micro energy lose tide fluid level transmitter and its used tide level measuring method |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2005221432A (en) * | 2004-02-06 | 2005-08-18 | Omron Corp | Liquid sensor and measurement method |
| CN101881642A (en) * | 2010-07-07 | 2010-11-10 | 山东佰测仪表有限公司 | Low power-consumption liquid level transmitter capable of remote control |
| CN102735310A (en) * | 2011-04-07 | 2012-10-17 | 上海达华测绘有限公司 | Self-contained tide level meter |
| CN104280157A (en) * | 2014-11-07 | 2015-01-14 | 上海艾络格电子技术有限公司 | Low-power-consumption transmitter |
| CN206114048U (en) * | 2016-09-28 | 2017-04-19 | 沈阳仪表科学研究院有限公司 | Little consumption morning and evening tides liquid level changer |
-
2016
- 2016-09-28 CN CN201610855389.7A patent/CN107870017A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2005221432A (en) * | 2004-02-06 | 2005-08-18 | Omron Corp | Liquid sensor and measurement method |
| CN101881642A (en) * | 2010-07-07 | 2010-11-10 | 山东佰测仪表有限公司 | Low power-consumption liquid level transmitter capable of remote control |
| CN102735310A (en) * | 2011-04-07 | 2012-10-17 | 上海达华测绘有限公司 | Self-contained tide level meter |
| CN104280157A (en) * | 2014-11-07 | 2015-01-14 | 上海艾络格电子技术有限公司 | Low-power-consumption transmitter |
| CN206114048U (en) * | 2016-09-28 | 2017-04-19 | 沈阳仪表科学研究院有限公司 | Little consumption morning and evening tides liquid level changer |
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