CN103558559A - System and method for monitoring state of charge of wireless sensor - Google Patents
System and method for monitoring state of charge of wireless sensor Download PDFInfo
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Abstract
The invention discloses a system and method for monitoring the state of charge of a wireless sensor. The system for monitoring the state of charge of the wireless sensor at least comprises a slave machine and a host machine, wherein the slave machine is used for collecting voltage of a lithium battery of the wireless sensor, converting the collected voltage into a digital value, and sending the voltage information which is represented by the digital value to the host machine through the wireless network, and the host machine is used for receiving the voltage information collected by the slave machine by means of the wireless network, calculating the state of charge of the lithium battery with a open-circuit voltage method according to the received voltage information which is represented by the digital value and displaying the state of charge of the lithium battery. The system and method for monitoring the state of charge of the wireless sensor have the advantages that the problem that the sudden failure, caused by lower power of the battery, of the wireless sensor network can be solved, the battery can be replaced in time according to broadcasting of the state of charge of the battery, reliability of the wireless sensor network is improved, and the service life of the wireless sensor network is prolonged.
Description
Technical field
The present invention relates to dump energy monitoring system and method, particularly relate to a kind of wireless senser dump energy monitoring system and method.
Background technology
Be accompanied by developing rapidly with increasingly mature of sensor technology, embedded and communication and semiconductor technology, wireless sensor network has stepped into post-PC era.Less, low-power consumption computing equipment has been broken traditional desk-top computer and the Design Mode of high-performance server more easily.Wireless sensor network has become active research branch of computer science at present, has caused the great attention of academia and industry member, is considered to one of technology of power that 2l century is had an immense impact on.
Moment sensor node generally all adopts powered battery, and it is more flexible that this arranges sensor network, needn't depend on existing power infrastructures.Yet still there is larger gap in the requirement of the indexs such as the energy of battery limited and wireless senser work long hours.Even for a small-scale wireless sensor network being comprised of 20-30 node, because battery electric quantity is too low, causing whole network failure is also thing beyond forbearance, can increase the maintenance cost of network.Therefore wireless senser dump energy monitoring technology is extremely important for wireless sensor network.The electric weight of sensor is not effectively monitored, be easy in operating process because the electric weight deficiency of certain or certain group sensor causes the breakdown of whole network.
Summary of the invention
The deficiency existing for overcoming above-mentioned prior art, the present invention's object is to provide a kind of wireless senser dump energy monitoring system and method, can solve the low problem that causes network catastrophic failure of wireless sensor network because battery electric quantity, and according to the forecast of dump energy is changed to battery in time, improve the reliability of wireless sensor network, the prolonging wireless sensor network life-span.
For reaching above-mentioned and other object, the present invention proposes a kind of wireless senser dump energy monitoring system, at least comprises:
Slave, for the lithium battery of wireless senser being carried out to voltage acquisition and being converted to digital quantity, sends the information of voltage of digital quantity to main frame by wireless network;
Main frame, utilizes wireless network to receive the information of voltage that this slave gathers, and according to the information of voltage of the digital quantity receiving, by open-circuit voltage method, is calculated the dump energy of this lithium battery and is shown.
Further, this slave comprises voltage acquisition and modular converter and slave wireless module, and this voltage acquisition and modular converter connect the lithium battery of this wireless senser, the voltage of this lithium battery is gathered, and carry out AD conversion; This slave wireless module connects this voltage acquisition and modular converter, for sending the information of voltage of digital quantity to this main frame by wireless network and receiving the control signal of this main frame.
Further, voltage acquisition and modular converter adopt the super low-power consumption PIC single-chip microcomputer of nanowatt level, there is sleep and low-power consumption mode, this single-chip microcomputer carries AD converter and SPI interface, this slave wireless module is ZigBee wireless module, the AD converter that this PIC single-chip microcomputer utilization carries is carried out voltage acquisition and conversion, by SPI interface and this Zigbee wireless module, communicates, and information of voltage is passed to this main frame by Zigbee wireless network.
Further, this slave regularly gathers information of voltage or is determined to gather constantly by main frame, and except gathering constantly, these slave other times are operated under dormant state, by this host wake-up.
Further, this main frame comprises main frame wireless module, dump energy computing module and display module, this main frame wireless module receives the information of voltage of slave wireless module transmission by wireless network or sends the control signal of this main frame, this dump energy computing module is set up the relation table of the dump energy of open-circuit voltage and battery by test, the relation table of the open-circuit voltage of setting up by inquiry according to the information of voltage receiving and the dump energy of battery obtains the dump energy of battery, according to the residue working time of the corresponding calculating battery of the dump energy of battery, and result is sent to display module shown.
Further, this main frame wireless module is Zigbee radio receiving transmitting module, supports ZigBee software stack, and this dump energy computing module is CPU (central processing unit).
Further, this main frame also comprises alarm module, when this dump energy computing module calculates the dump energy during lower than a preset value that obtains battery, trigger this alarm module and report to the police, this dump energy calculates that module and will provide by display module the relevant information of changing battery simultaneously.
For achieving the above object, the present invention also provides a kind of wireless senser dump energy monitoring method, comprises the steps:
Step 2, this slave sends to main frame by wireless network by the information of voltage of digital quantity;
Step 3, this main frame receives the information of voltage of digital quantity, utilizes open-circuit voltage method to calculate the dump energy that obtains battery, and is shown.
Further, after step 3, also comprise the steps:
Whether the dump energy that judges battery is less than a preset value;
If be less than preset value, report to the police, and battery is changed in prompting.
Further, before step 3, this main frame is set up the relation table of the dump energy of open-circuit voltage and battery by test; In step 3, this main frame obtains the dump energy of battery according to the relation table of the dump energy of information of voltage inquiry open-circuit voltage and battery.
Compared with prior art, the present invention's a kind of wireless senser dump energy monitoring system and method adopt the dump energy of super low-power consumption slave and Zigbee wireless network monitoring wireless sensor battery, the residue working time of forecast sensor, solved the loss that the low catastrophic failure of wireless sensor network because electric weight brings, the reliability that has improved wireless network, has extended wireless sensor network life.
Accompanying drawing explanation
Fig. 1 is the open-circuit voltage of lithium battery and the experimental curve diagram of SOC;
Fig. 2 is the system architecture diagram of a kind of wireless senser dump energy of the present invention monitoring system;
Fig. 3 is the Organization Chart of the preferred embodiment of a kind of wireless senser dump energy of the present invention monitoring system;
Fig. 4 is the flow chart of steps of a kind of wireless senser dump energy of the present invention monitoring method;
Fig. 5 is the main program flow chart of slave computer in preferred embodiment of the present invention (slave);
Fig. 6 is the main program flow chart of host computer in preferred embodiment of the present invention (main frame).
Embodiment
Below, by specific instantiation accompanying drawings embodiments of the present invention, those skilled in the art can understand other advantage of the present invention and effect easily by content disclosed in the present specification.The present invention also can be implemented or be applied by other different instantiation, and the every details in this instructions also can be based on different viewpoints and application, carries out various modifications and change not deviating under spirit of the present invention.
Before explanation the present invention, first introduce lower Research foundation of the present invention:
By research, find, the open-circuit voltage of lithium battery and battery SOC (State of Charge, state-of-charge) corresponding relation is clearer and more definite, based on this corresponding relation, according to the experimental curve diagram of Fig. 1, can find out, when the stage of SOC 0～20%, open-circuit voltage is nonlinear curve trend relation; When the stage of SOC 20%～80%, open-circuit voltage is linear approximate relationship; When the stage of SOC 80%～100%, open-circuit voltage is again nonlinear curve trend relation.
Lithium battery in wireless senser, be 20 months general service time, in order to shorten experimental period, tests by discharging and recharging.When SOC calculates lower than 20% time, host computer is received signal, gives the alarm, and battery is changed in prompting.
In wireless senser, the voltage range of lithium battery is 3.3V-4.2V, by research, find, when battery discharge just can not continue to have discharged to 3.35V, and SOC is when 20%-80%, cell voltage tends to be steady and discharges slowly, so when battery electric quantity should be stopped using lower than 20%, in order to avoid power-off suddenly affects the normal use of wireless senser, and can extend the serviceable life of lithium battery.
Table 1 is the relation of the open-circuit voltage of lithium battery and the SOC of battery.The present invention the forecast sensor residual working time, obtains by question blank 1 dump energy that voltage is corresponding by the dump energy (SOC) of battery by estimating by open-circuit voltage method.
Fig. 2 is the system architecture diagram of a kind of wireless senser dump energy of the present invention monitoring system, and Fig. 3 is the Organization Chart of the preferred embodiment of a kind of wireless senser dump energy of the present invention monitoring system.As shown in Figures 2 and 3, a kind of wireless senser dump energy of the present invention monitoring system, the dump energy for the lithium battery of monitoring wireless sensor, comprising: slave 10 and main frame 20.
Wherein, slave 10 is for the lithium battery of wireless senser is carried out to voltage acquisition, and by wireless network, sends the information of voltage of collection to main frame 20.Slave 10 can regularly gather information of voltage, also can determine to gather constantly (main frame transmits the corresponding command by wireless network while determining to gather) by main frame, slave other times are operated under dormant state, by host wake-up (determine to gather constantly in main frame, wake up by wireless network).Concrete, slave 10 comprises voltage acquisition and modular converter 101 and slave wireless module 102, wherein, voltage acquisition and modular converter 101 connect the lithium battery of wireless senser, voltage to lithium battery gathers, and carrying out AD conversion, slave wireless module 102 connects voltage acquisition and modular converter 101, for sending the information of voltage (digital quantity) gathering the control signal of main frame 20 and Receiving Host 20 to by wireless network.In preferred embodiment of the present invention, voltage acquisition and modular converter 101 adopt the super low-power consumption PIC single-chip microcomputer of nanowatt level, there is sleep and low-power consumption mode, this single-chip microcomputer carries 10 bit A/D converters and SPI interface, slave wireless module 102 is Zigbee radio receiving transmitting module, supports ZigBee software stack, and 10 AD that this PIC single-chip microcomputer utilization carries carry out voltage acquisition, by SPI interface and Zigbee wireless module, communicate, information of voltage is passed to main frame 20 by Zigbee wireless network.
Described in brought forward, by research, find, when battery discharge just can not continue to have discharged to 3.35V, and SOC is when 20%-80%, cell voltage tends to be steady and discharges slowly, should stop using, in order to avoid power-off suddenly affects the normal use of wireless senser so work as battery electric quantity lower than 20%.Therefore, preferably, main frame 20 also comprises alarm module 204, the dump energy that calculates the battery obtaining when dump energy computing module 202 is during lower than a preset value (battery capacity 20%), dump energy computing module 202 is reported to the police trigger alarm module 202, dump energy computing module 102 will provide the address of wireless senser by display module 203 simultaneously, prompting changing battery, in preferred embodiment of the present invention, alarm module 202 can adopt audible alarm, also can adopt other modes as light warning etc., the present invention is not as limit.
Fig. 4 is the flow chart of steps of a kind of wireless senser dump energy of the present invention monitoring method.As shown in Figure 4, a kind of wireless senser dump energy of the present invention monitoring method, comprises the steps:
Preferably, after step 403, also comprise the steps:
Whether the dump energy (SOC) that judges battery is less than a preset value (as 20% of battery capacity);
If be less than preset value, report to the police, and battery is changed in prompting.
In preferred embodiment of the present invention, before step 303, main frame is set up the relation table of the dump energy of open-circuit voltage and battery by test; In step 303, main frame obtains the dump energy (SOC) of battery according to the relation table of the dump energy of information of voltage inquiry open-circuit voltage and battery.
Fig. 5 is the main program flow chart of slave computer in preferred embodiment of the present invention (slave), and Fig. 6 is the main program flow chart of host computer in preferred embodiment of the present invention (main frame).The observation process of the present invention's dump energy will be further illustrated by a specific embodiment below: wireless senser dump energy monitoring system is after powering on, first system carries out initialization, comprises the initialization of PIC single-chip microcomputer itself and the initialization of radio communication.Slave computer (slave) is responsible for voltage to gather, and obtains the information of voltage in lithium battery, and the analog to digital conversion by PIC single-chip microcomputer becomes voltage into digital quantity and carried out radio communication and be sent to host computer (main frame) by SPI mouth and ZigBee wireless module.
Host computer (main frame) carries out initialization command equally, after confirming to receive the data that slave computer (slave) sends, carries out OCV-SOC(open-circuit voltage-state-of-charge) calculating, when SOC is less than 20%, report to the police immediately, battery process ends are changed in prompting; When SOC is greater than 20%, whole monitoring flow process finishes.
In sum, the present invention's a kind of wireless senser dump energy monitoring system and method adopt the dump energy of super low-power consumption slave and Zigbee wireless network monitoring wireless sensor battery, the residue working time of forecast sensor, solved the loss that the low catastrophic failure of wireless sensor network because electric weight brings, the reliability that has improved wireless network, has extended wireless sensor network life.
Above-described embodiment is illustrative principle of the present invention and effect thereof only, but not for limiting the present invention.Any those skilled in the art all can, under spirit of the present invention and category, modify and change above-described embodiment.Therefore, the scope of the present invention, should be as listed in claims.
Claims (10)
1. a wireless senser dump energy monitoring system, at least comprises:
Slave, for the lithium battery of wireless senser being carried out to voltage acquisition and being converted to digital quantity, sends the information of voltage of digital quantity to main frame by wireless network;
Main frame, utilizes wireless network to receive the information of voltage that this slave gathers, and according to the information of voltage of the digital quantity receiving, by open-circuit voltage method, is calculated the dump energy of this lithium battery and is shown.
2. a kind of wireless senser dump energy monitoring system as claimed in claim 1, it is characterized in that: this slave comprises voltage acquisition and modular converter and slave wireless module, this voltage acquisition and modular converter connect the lithium battery of this wireless senser, voltage to this lithium battery gathers, and carries out AD conversion; This slave wireless module connects this voltage acquisition and modular converter, for sending the information of voltage of digital quantity to this main frame by wireless network and receiving the control signal of this main frame.
3. a kind of wireless senser dump energy monitoring system as claimed in claim 2, it is characterized in that: voltage acquisition and modular converter adopt the super low-power consumption PIC single-chip microcomputer of nanowatt level, there is sleep and low-power consumption mode, this single-chip microcomputer carries AD converter and SPI interface, this slave wireless module is ZigBee wireless module, the AD converter that this PIC single-chip microcomputer utilization carries is carried out voltage acquisition and conversion, by SPI interface and this Zigbee wireless module, communicate, information of voltage is passed to this main frame by Zigbee wireless network.
4. a kind of wireless senser dump energy monitoring system as claimed in claim 1, it is characterized in that: this slave regularly gathers information of voltage or determined to gather constantly by main frame, except gathering constantly, these slave other times are operated under dormant state, by this host wake-up.
5. a kind of wireless senser dump energy monitoring system as claimed in claim 1, it is characterized in that: this main frame comprises main frame wireless module, dump energy computing module and display module, this main frame wireless module receives the information of voltage of slave wireless module transmission by wireless network or sends the control signal of this main frame, this dump energy computing module is set up the relation table of the dump energy of open-circuit voltage and battery by test, the relation table of the open-circuit voltage of setting up by inquiry according to the information of voltage receiving and the dump energy of battery obtains the dump energy of battery, according to the residue working time of the corresponding calculating battery of the dump energy of battery, and result is sent to display module shown.
6. a kind of wireless senser dump energy monitoring system as claimed in claim 5, is characterized in that: this main frame wireless module is Zigbee radio receiving transmitting module, supports ZigBee software stack, and this dump energy computing module is CPU (central processing unit).
7. a kind of wireless senser dump energy monitoring system as claimed in claim 6, it is characterized in that: this main frame also comprises alarm module, when this dump energy computing module calculates the dump energy during lower than a preset value that obtains battery, trigger this alarm module and report to the police, this dump energy calculates that module and will by display module, provide the relevant information of changing battery simultaneously.
8. a wireless senser dump energy monitoring method, comprises the steps:
Step 1, slave carries out voltage acquisition, obtains the information of voltage in the lithium battery of wireless senser and is converted into digital quantity;
Step 2, this slave sends to main frame by wireless network by the information of voltage of digital quantity;
Step 3, this main frame receives the information of voltage of digital quantity, utilizes open-circuit voltage method to calculate the dump energy that obtains battery, and is shown.
9. a kind of wireless senser dump energy monitoring method as claimed in claim 8, is characterized in that, after step 3, also comprises the steps:
Whether the dump energy that judges battery is less than a preset value;
If be less than preset value, report to the police, and battery is changed in prompting.
10. a kind of wireless senser dump energy monitoring method as claimed in claim 8, is characterized in that: before step 3, this main frame is set up the relation table of the dump energy of open-circuit voltage and battery by test; In step 3, this main frame obtains the dump energy of battery according to the relation table of the dump energy of information of voltage inquiry open-circuit voltage and battery.
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| CN109976201A (en) * | 2017-12-28 | 2019-07-05 | 博西华电器（江苏）有限公司 | A kind of sensor and sensing and controlling system |
| CN108263779A (en) * | 2018-02-08 | 2018-07-10 | 成都奥北环保科技有限公司 | Refuse collector and system and the method for the system |
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| CN110764006B (en) * | 2019-12-30 | 2020-10-27 | 杭州华塑加达网络科技有限公司 | Battery management system |
| CN111478926A (en) * | 2020-05-26 | 2020-07-31 | 合肥中科类脑智能技术有限公司 | Circuit monitoring sensor data collection method and device |
| CN111749569A (en) * | 2020-07-03 | 2020-10-09 | 南通四方节能科技有限公司 | Control method for movable door body with sensor electric quantity early warning function |
| CN111999655A (en) * | 2020-08-07 | 2020-11-27 | 北京浪潮数据技术有限公司 | BBU electric quantity detection method, system and related components |
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| CN113447830A (en) * | 2021-06-28 | 2021-09-28 | 杭州安脉盛智能技术有限公司 | Method and device for monitoring electric quantity of lithium battery of wireless intelligent sensor |
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Application publication date: 20140205 |