CN104680762A - Low-power consumption wireless information acquisition system for multipoint sensors - Google Patents
Low-power consumption wireless information acquisition system for multipoint sensors Download PDFInfo
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- CN104680762A CN104680762A CN201510116701.6A CN201510116701A CN104680762A CN 104680762 A CN104680762 A CN 104680762A CN 201510116701 A CN201510116701 A CN 201510116701A CN 104680762 A CN104680762 A CN 104680762A
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Abstract
The invention relates to a low-power consumption wireless information acquisition system for multipoint sensors. The system is characterized by comprising a host and multiple sensor nodes, wherein the sensor nodes are wirelessly connected with the host respectively; each sensor node comprises a power circuit, a sensor circuit, an acquisition circuit and a wireless communication circuit; each power circuit comprises a battery power supply, a microprocessor, a first switch, a first direct current voltage stabilizing circuit, a second switch and a second direct current voltage stabilizing circuit; the battery power supplies are used for providing reference voltage for the sensor circuits and the acquisition circuits sequentially through the first switches and the first direct current voltage stabilizing circuits, also supplying power to the wireless communication circuits sequentially through the second direct current voltage stabilizing circuits and the second switches, and further supplying power to the microprocessors through the second direct current voltage stabilizing circuits; the microprocessors are used for controlling the first and second switches respectively; the sensor circuits are connected with the acquisition circuits; sensing signals output by the acquisition circuits are transmitted to the host through the wireless communication circuits after being acquired by the microprocessors.
Description
Technical field
The present invention relates to a kind of information acquisition system, be specifically related to a kind ofly be applied to the low-consumption wireless information acquisition system in heat exchange station system, the transducing signal of temperature, pressure, liquid level and flow sensor being carried out to the multipoint sensor of Real-time Collection.
Background technology
In current heat exchange station system, need precise acquisition pipe interior temperature, pressure, liquid level, flow, control for monitoring and heat exchange station system, therefore just need Real-time Collection to be arranged on the transducing signal of large amount temperature, pressure, liquid level and flow sensor on different acquisition point.Conventional temperature, pressure, liquid level and flow sensor adopt 24V DC power supply, and export 4-20mA direct current, the mode respectively by wire accesses the analogue collection module of PLC, carrys out acquisition stream through the electric current of sensor and obtains sensor current data.The transducing signal of each sensor carries out storing by PLC, Web Publishing or participate in controlling.
Owing to there being tens even hundreds of sensor in each heat exchange station system, power consumption is comparatively large, and the powered battery duration is short; And sensor is all connected by wire with PLC, this just requires that PLC module has to expand A/D acquisition interface, to meet the demand of number of sensors, brings high cost virtually; Further, wire connects complicated loaded down with trivial details, is unfavorable for maintenance or the replacing of sensor.
The loaded down with trivial details problem of complexity brought is connected in order to solve wire, prior art adopts the mode pick-up transducers information of wireless transmission, but traditional sensor needs 24V DC power supply, export 4-20mA electric current, the problem that power consumption is large, the powered battery duration is short is not still resolved, and does not therefore possess Practical significance.
Summary of the invention
The present invention is directed to the deficiencies in the prior art, propose a kind of optimization passed through sensor circuit and Acquisition Circuit, input voltage is down to about 3V, for sensor uses powered battery to provide condition; And by the instantaneous collection of sensor information and the Time-sharing control of wireless transceiver, reduce the low-consumption wireless information acquisition system of biosensor power consumption.
Technical scheme of the present invention is as follows:
A low-consumption wireless information acquisition system for multipoint sensor, is characterized in that: comprise main frame and multiple sensor node, and described sensor node passes through wireless connections with described main frame respectively; Described sensor node comprises power circuit, sensor circuit, Acquisition Circuit and wireless communication line, and described power circuit comprises battery supply, microprocessor, the first switch, the first direct current regulation circuit, second switch and the second D.C. regulated power supply; Described battery supply provides reference voltage by described first switch and the first direct current regulation circuit to described sensor circuit and Acquisition Circuit successively; Described battery supply is also powered to described wireless communication line by described second direct current regulation circuit and second switch successively; Described battery supply passes through the second direct current regulation circuit to described microprocessor power supply simultaneously; Described microprocessor controls the first switch and second switch respectively; Described sensor circuit connects Acquisition Circuit, and the transducing signal that described Acquisition Circuit exports is sent in described main frame by after described microcontroller acquires by described wireless communication line;
Described microprocessor-based control process comprises:
1) the first switch opens described in described Microprocessor S3C44B0X, described battery supply is powered to described sensor circuit and Acquisition Circuit;
2) described microcontroller acquires complete after control described first switch close;
3) described in described Microprocessor S3C44B0X, second switch is opened, and described battery supply is powered to described wireless communication line, and described wireless communication line starts to transmit described heat transfer agent to described main frame;
4) treat that described wireless communication line is transmitted, second switch described in described Microprocessor S3C44B0X is closed.
Described Acquisition Circuit comprises the elementary differential amplifier that connects successively and amplifier in proportion; The input end of described elementary differential amplifier connects the output terminal of described sensor circuit.
The output terminal of described amplifier in proportion connects filtering circuit.
The enlargement factor of described elementary differential amplifier is 5.
The enlargement factor of described amplifier is in proportion 10.
The transducing signal that described Acquisition Circuit exports is 0.5-3V.
Also comprise the main control unit be connected with described main frame, the heat transfer agent received inputs in described main control unit by described main frame, and the control command being used for the frequency arranging the first switch and second switch described in described microprocessor switch is inputted in described microprocessor by described main frame by described main control unit.
Described battery supply is lithium battery.
Described first switch and second switch are switch mosfet.
Described sensor circuit comprises temperature sensor, pressure transducer and flow sensor.
Technique effect of the present invention is as follows:
The low-consumption wireless information acquisition system of a kind of multipoint sensor of the present invention, is characterized in that: comprise main frame and multiple sensor node, sensor node passes through wireless connections respectively at main frame; Sensor node comprises power circuit, sensor circuit, Acquisition Circuit and wireless communication line, and power circuit comprises battery supply, microprocessor, the first switch, the first direct current regulation circuit, second switch and the second D.C. regulated power supply; Battery supply provides reference voltage by the first switch and the first direct current regulation circuit to sensor circuit and Acquisition Circuit successively; Battery supply is also powered to wireless communication line by the second direct current regulation circuit and second switch successively; Battery supply passes through the second direct current regulation circuit to microprocessor power supply simultaneously; Microprocessor controls the first switch and second switch respectively; Sensor circuit connects Acquisition Circuit, and the transducing signal that Acquisition Circuit exports is sent in main frame by wireless communication line by after microcontroller acquires.The present invention comprises the Acquisition Circuit of elementary differential amplifier and amplifier two-stage amplification in proportion owing to connecting after sensor circuit, the faint transducing signal that sensor circuit can be inputted under lower reference voltage carries out denoising, amplification and filtering, exports the transducing signal for microcontroller acquires.
Sensors amplifying circuit adopts 24V to power, signal amplification ratio is easier to, in the present invention owing to adopting battery power, therefore need to limit the power consumption of sensor circuit, amplifying circuit needs the feeble signal of sensor to be amplified to 0.5-3V, therefore the present invention uses two-stage to amplify in Acquisition Circuit: namely the first order is differential amplification, and enlargement factor is 5; The second level is that in-phase proportion amplifies, and enlargement factor is 10.The amplification precision of the transducing signal exported can not only be ensured like this, and meet the acquisition range of microprocessor.
Because Microprocessor S3C44B0X first switch and second switch carry out the instantaneous collection to sensor circuit, Acquisition Circuit, and to wireless communication line Time-sharing control, therefore the power consumption of sensor node is significantly reduced, and the low reference voltage of combined sensor circuit and Acquisition Circuit, make sensor circuit adopt battery power to become possibility.
Because user can arrange sample frequency and communication frequency at main control unit, when sample frequency is that 1Hz can complete sampling, therefore within 1s, sensor circuit Acquisition Circuit only has 2ms in work, and all the other times are all in closed condition; Under the sample frequency of 1Hz, the wireless communication line most of the time is in closed condition, realizes low-power consumption.
Accompanying drawing explanation
Fig. 1 is system architecture schematic diagram of the present invention
Fig. 2 is circuit construction of electric power schematic diagram of the present invention
The structural representation that Fig. 3 is sensor circuit of the present invention when being temperature collection circuit
The structural representation that Fig. 4 is sensor circuit of the present invention when being pressure acquisition circuit
Structural representation when Fig. 5 to be sensor circuit of the present invention be liquid level and flow collection circuit
Embodiment
Below in conjunction with accompanying drawing, the present invention will be described.
In order to make object of the present invention, technical scheme and advantage clearly understand, below in conjunction with drawings and Examples, the present invention is further elaborated.Specific embodiment described herein only in order to explain the present invention, is not intended to limit the present invention.
As shown in Figure 1, system of the present invention comprises main control unit 1, main frame 2 and multiple sensor node 3, wherein multiple sensor node 3 passes through wireless connections with main frame 2 respectively, the control command sent by main control unit 1 is sent to sensor node 3 by main frame 2, and the information such as the transducing signal uploaded by sensor node 3 return in main control unit 1.
Sensor node 3 comprises power circuit 31, sensor circuit 32, Acquisition Circuit 33 and wireless communication line 34, and wherein power circuit 31 realizes instantaneous collection for controlling Acquisition Circuit 33, and the Time-sharing control to wireless communication line 34; Power circuit 31 provides the reference voltage far below 24V to sensor circuit 32 and Acquisition Circuit 33, elementary differential amplifier 331, in proportion amplifier 332 and filtering circuit 333 are set in Acquisition Circuit 33, the faint transducing signal that sensor circuit 32 is exported at lower voltages after the denoising of Acquisition Circuit 33, amplification and filtering by the microcontroller acquires in power circuit 31 after exported to main frame 2 by wireless communication line 34.Sensor circuit 32 comprises temperature sensor, pressure transducer and flow sensor etc.
As shown in Figure 2, power circuit 31 comprises battery supply 311, microprocessor 312, first switch 313, first direct current regulation circuit 314, second switch 315 and the second D.C. regulated power supply 316.Wherein, as shown by the solid line, battery supply 311 provides reference voltage by the first switch 313 and the first direct current regulation circuit 314 to sensor circuit 32 and Acquisition Circuit 33 successively; Battery supply 311 is also powered to wireless communication line 34 by the second direct current regulation circuit 316 and second switch 315 successively; Battery supply 311 is powered to microprocessor 312 by the second direct current regulation circuit 316 simultaneously.
Shown in dotted line, microprocessor 312 is for controlling the first switch 313 and second switch 315 respectively; And as indicated by chain dotted lines, the information such as the transducing signal that pick-up transducers circuit 32 exports, are sent in main frame 2 by wireless communication line 34, are received from the control command that main frame 2 exports, control sample frequency simultaneously.
Because the signal of sensor circuit 32 is fainter, output area is 10-60mV, therefore the enlargement factor setting elementary differential amplifier 331 is 5, the enlargement factor of amplifier 332 is 10 in proportion, transducing signal after amplification exports as 0.5-3V, the amplification precision of the transducing signal exported can not only be ensured, and meet the acquisition range of microprocessor 312.
As shown in Figure 3, when sensor circuit 32 is temperature collection circuit, PT100 temperature sensor and resistance R61, resistance R62, resistance R68 form electric bridge, and bridge input voltage is 3V reference voltage.Temperature variation can cause PT100 change in resistance, and thus electric bridge is uneven, exports weak voltage.After the elementary differential amplification of rail-to-rail single supply operational amplifier, in-phase proportion amplification of Acquisition Circuit 33, export 0-3V voltage; Gather for microprocessor 312 after the filtering of resistance R65 and electric capacity C72 again.
As shown in Figure 4, when sensor circuit 32 is pressure acquisition circuit, pressure transducer J1 is made up of pressure bridge, four-wire system, and PSS+, PSS-are voltage input, and PSO+, PSO-are that voltage exports.Because sensor circuit 32 output voltage is less, after the elementary differential amplification of rail-to-rail single supply operational amplifier, in-phase proportion amplify, export 0-3V voltage, gather for microprocessor 312 after R54 and C61 filtering.
As shown in Figure 5, when sensor circuit 32 is liquid level, flow collection circuit, the change of working environment, sensor can flow through different electric currents, produces relevant voltage at R1 two ends.Because sensor circuit 32 output voltage is less, after the elementary differential amplification of rail-to-rail single supply operational amplifier, in-phase proportion amplification of Acquisition Circuit 33, export 0-3V voltage, gather for microprocessor 312 after the filtering of resistance R5 and electric capacity C1.
Embodiment 1:
Battery supply 311 is single lithium battery preferably, and cell voltage is 4.7V ± 0.5V, the first switch 313 and second switch 315 preferably switch mosfet.Battery supply 311 through the second direct current regulation circuit 316 by voltage stabilization at 3.3V, power for giving the microprocessor 312 of low-power consumption.Microprocessor 312 controls the first switch 313 and opens, and the 4.7V voltage of battery supply 311 passes to the first direct current regulation circuit 314, by voltage stabilization at 3V, powers to sensor circuit 32 and Acquisition Circuit 33 as reference voltage.
Control the first switch 313 from microprocessor 312 to open, to the 3V voltage of the first direct current regulation circuit 314 stable output, need the time of 1.5ms.After the first direct current regulation circuit 314 stable output voltage, temperature, pressure, liquid level, flow information are converted into faint electric signal by sensor circuit 32, elementary differential amplifier 331 through Acquisition Circuit 33 amplifies, in proportion amplifier 332 amplify and output to after filtering circuit 333 filtering microprocessor 312 A/D gather port, carry out multi collect by microprocessor 312, this process time continues 0.4ms.After collection completes, microprocessor 312 controls the first switch 313 and cuts out.Through actual measurement, during the first switch 313 conducting, this circuital current is 7mA; When first switch 313 cuts out, this circuital current is 0.001mA.Because sample frequency is that 1Hz can meet the demands, therefore within 1s, only have 2ms circuit in work, all the other times are all in closed condition, and sensor circuit 32, Acquisition Circuit 33 power consumption are extremely low.The sample frequency of microprocessor 312 can be set to microprocessor 312 by main frame 2 by main control unit 1.
Embodiment 2:
In wireless communication system, radio communication operating circuit power consumption is maximum.By carrying out Time-sharing control to wireless communication line 34, after microprocessor 312 has gathered the heat transfer agents such as temperature and pressure, microprocessor 312 controls second switch 315 and opens, open second switch 315, battery supply 311 is also powered to wireless communication line 34 by the second direct current regulation circuit 316 and second switch 315 successively, and wireless communication line 34 starts to transmit to main frame 2 data comprising heat transfer agent.Pending data is transmitted, and microprocessor 312 controls second switch 315 and cuts out, wireless communication line 34 power-off.The wirelessly transmitting data time is 0.01ms, and under the sample frequency of 1Hz, wireless communication line 34 most of the time is in closed condition, realizes low-power consumption.
It should be pointed out that above institute embodiment can make the invention of those skilled in the art's comprehend, but do not limit the present invention in any way creation.Therefore; although this instructions has been described in detail the invention with reference to drawings and Examples; but; those skilled in the art are to be understood that; still can modify to the invention or equivalent replacement; in a word, all do not depart from technical scheme and the improvement thereof of the spirit and scope of the invention, and it all should be encompassed in the middle of the protection domain of the invention patent.
Claims (10)
1. a low-consumption wireless information acquisition system for multipoint sensor, is characterized in that: comprise main frame and multiple sensor node, and described sensor node passes through wireless connections with described main frame respectively; Described sensor node comprises power circuit, sensor circuit, Acquisition Circuit and wireless communication line, and described power circuit comprises battery supply, microprocessor, the first switch, the first direct current regulation circuit, second switch and the second D.C. regulated power supply; Described battery supply provides reference voltage by described first switch and the first direct current regulation circuit to described sensor circuit and Acquisition Circuit successively; Described battery supply is also powered to described wireless communication line by described second direct current regulation circuit and second switch successively; Described battery supply passes through the second direct current regulation circuit to described microprocessor power supply simultaneously; Described microprocessor controls the first switch and second switch respectively; Described sensor circuit connects Acquisition Circuit, and the transducing signal that described Acquisition Circuit exports is sent in described main frame by after described microcontroller acquires by described wireless communication line;
Described microprocessor-based control process comprises:
1) the first switch opens described in described Microprocessor S3C44B0X, described battery supply is powered to described sensor circuit and Acquisition Circuit;
2) described microcontroller acquires complete after control described first switch close;
3) described in described Microprocessor S3C44B0X, second switch is opened, and described battery supply is powered to described wireless communication line, and described wireless communication line starts to transmit described heat transfer agent to described main frame;
4) treat that described wireless communication line is transmitted, second switch described in described Microprocessor S3C44B0X is closed.
2. the low-consumption wireless information acquisition system of a kind of multipoint sensor as claimed in claim 1, is characterized in that: described Acquisition Circuit comprises the elementary differential amplifier that connects successively and amplifier in proportion; The input end of described elementary differential amplifier connects the output terminal of described sensor circuit.
3. the low-consumption wireless information acquisition system of a kind of multipoint sensor as claimed in claim 2, is characterized in that: the output terminal of described amplifier in proportion connects filtering circuit.
4. the low-consumption wireless information acquisition system of a kind of multipoint sensor as claimed in claim 2 or claim 3, is characterized in that: the enlargement factor of described elementary differential amplifier is 5.
5. the low-consumption wireless information acquisition system of a kind of multipoint sensor as claimed in claim 2 or claim 3, is characterized in that: the enlargement factor of described amplifier is in proportion 10.
6. the low-consumption wireless information acquisition system of a kind of multipoint sensor as claimed in claim 1 or 2, is characterized in that: the transducing signal that described Acquisition Circuit exports is 0.5-3V.
7. the low-consumption wireless information acquisition system of a kind of multipoint sensor as described in claim 1 or 2 or 3, it is characterized in that: also comprise the main control unit be connected with described main frame, the heat transfer agent received inputs in described main control unit by described main frame, and the control command being used for the frequency arranging the first switch and second switch described in described microprocessor switch is inputted in described microprocessor by described main frame by described main control unit.
8. the low-consumption wireless information acquisition system of a kind of multipoint sensor as described in claim 1 or 2 or 3, is characterized in that: described battery supply is lithium battery.
9. the low-consumption wireless information acquisition system of a kind of multipoint sensor as described in claim 1 or 2 or 3, is characterized in that: described first switch and second switch are switch mosfet.
10. the low-consumption wireless information acquisition system of a kind of multipoint sensor as described in claim 1 or 2 or 3, is characterized in that: described sensor circuit comprises temperature sensor, pressure transducer and flow sensor.
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN101520939A (en) * | 2009-03-17 | 2009-09-02 | 珠海市德莱环保科技有限公司 | Energy-saving wireless monitoring system for dam and energy-saving control method |
| CN202907206U (en) * | 2012-10-16 | 2013-04-24 | 北京得瑞紫蜂科技有限公司 | Wireless sensor network collector |
| CN103645796A (en) * | 2013-12-13 | 2014-03-19 | 南京金水尚阳软件技术有限公司 | High-performance hydrology and water resource RTU (remote terminal unit) based on ARM (advanced RISC machine) framework and power consumption control method of RTU |
| CN204101943U (en) * | 2014-10-13 | 2015-01-14 | 南京拓诺传感网络科技有限公司 | Industrial equipment and environmental monitoring wsn collector |
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- 2015-03-17 CN CN201510116701.6A patent/CN104680762A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101520939A (en) * | 2009-03-17 | 2009-09-02 | 珠海市德莱环保科技有限公司 | Energy-saving wireless monitoring system for dam and energy-saving control method |
| CN202907206U (en) * | 2012-10-16 | 2013-04-24 | 北京得瑞紫蜂科技有限公司 | Wireless sensor network collector |
| CN103645796A (en) * | 2013-12-13 | 2014-03-19 | 南京金水尚阳软件技术有限公司 | High-performance hydrology and water resource RTU (remote terminal unit) based on ARM (advanced RISC machine) framework and power consumption control method of RTU |
| CN204101943U (en) * | 2014-10-13 | 2015-01-14 | 南京拓诺传感网络科技有限公司 | Industrial equipment and environmental monitoring wsn collector |
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