CN111385773A - Intelligence water gauge control circuit based on NB-IOT - Google Patents

Intelligence water gauge control circuit based on NB-IOT Download PDF

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Publication number
CN111385773A
CN111385773A CN202010212520.4A CN202010212520A CN111385773A CN 111385773 A CN111385773 A CN 111385773A CN 202010212520 A CN202010212520 A CN 202010212520A CN 111385773 A CN111385773 A CN 111385773A
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CN
China
Prior art keywords
circuit
iot
water meter
module
power supply
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CN202010212520.4A
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Chinese (zh)
Inventor
吴琦
余震
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Wuhan University of Science and Engineering WUSE
Wuhan University of Science and Technology WHUST
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Wuhan University of Science and Engineering WUSE
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Priority to CN202010212520.4A priority Critical patent/CN111385773A/en
Publication of CN111385773A publication Critical patent/CN111385773A/en
Pending legal-status Critical Current

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W4/00—Services specially adapted for wireless communication networks; Facilities therefor
    • H04W4/70—Services for machine-to-machine communication [M2M] or machine type communication [MTC]
    • G—PHYSICS
    • G08—SIGNALLING
    • G08C—TRANSMISSION SYSTEMS FOR MEASURED VALUES, CONTROL OR SIMILAR SIGNALS
    • G08C17/00—Arrangements for transmitting signals characterised by the use of a wireless electrical link
    • G08C17/02—Arrangements for transmitting signals characterised by the use of a wireless electrical link using a radio link
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W52/00—Power management, e.g. TPC [Transmission Power Control], power saving or power classes
    • H04W52/02—Power saving arrangements
    • H04W52/0209—Power saving arrangements in terminal devices
    • H04W52/0225—Power saving arrangements in terminal devices using monitoring of external events, e.g. the presence of a signal
    • H04W52/0248—Power saving arrangements in terminal devices using monitoring of external events, e.g. the presence of a signal dependent on the time of the day, e.g. according to expected transmission activity
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W52/00—Power management, e.g. TPC [Transmission Power Control], power saving or power classes
    • H04W52/02—Power saving arrangements
    • H04W52/0209—Power saving arrangements in terminal devices
    • H04W52/0261—Power saving arrangements in terminal devices managing power supply demand, e.g. depending on battery level
    • H04W52/0274—Power saving arrangements in terminal devices managing power supply demand, e.g. depending on battery level by switching on or off the equipment or parts thereof
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
    • Y02D30/00—Reducing energy consumption in communication networks
    • Y02D30/70—Reducing energy consumption in communication networks in wireless communication networks

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Measuring Volume Flow (AREA)

Abstract

The invention discloses an NB-IOT (NB-IOT) -based intelligent water meter control circuit Internet of things water meter system, which comprises an MCU (microprogrammed control unit) system, wherein the MCU system is respectively connected with a memory circuit, an NFC (near field communication) circuit and an NB module circuit, and is also respectively connected with a pulse metering circuit and a power supply circuit, and is realized by an R7F0C019L2DFB singlechip. In the design process, the low-power consumption mode of the single chip microcomputer and the PSM, DXR and other technologies of the NB module are utilized, the low-and-medium end of the designed water meter has ultralow power consumption, the power consumption of the terminal during static metering is lower than 10uA, the design requirement that the service life of the wireless water meter terminal reaches 7 years under the condition of battery power supply can be met, meanwhile, a reading controller and a concentrator are not needed during terminal deployment, the deployment cost is greatly reduced, and the management is convenient.

Description

Intelligence water gauge control circuit based on NB-IOT
Technical Field
The invention belongs to the technical field of water meters, and particularly relates to an intelligent water meter control circuit based on NB-IOT.
Background
The development of water supply enterprises is always limited by the traditional water meter device, so that the operation management is low in effect, the water supply enterprises rely on manual meter reading, a long meter reading period is provided, the water supply problem is difficult to find in time, the statistical management of resident water consumption data is difficult, and civil disputes often occur due to the water meter. And the water gauge is mostly manual management, and the spot check is maintained the time span and is big, and the illegal water use condition is difficult to control for supply water production and marketing poor rate is high. The loss problem of the water supply network, the metering error of the electric meter, the embezzlement, the water meter fault and other series problems all bring about the great loss of water supply resources, and the benefits of water supply enterprises are damaged. Although the agenda for preventing and controlling water supply loss is already advanced, the problem of management delay caused by insufficient manpower is faced with massive users, and the problem of poor production and marketing is not solved due to higher artificial maintenance cost. The water meter is related to the personal interests of customers and water supply enterprises, and settlement is usually carried out according to the reading of the water meter, if the problems of water meter failure or meter reading error and the like occur, great troubles are brought, and the service satisfaction of the customers is influenced.
Disclosure of Invention
In order to fully solve the problems, the invention provides an intelligent water meter control circuit based on NB-IOT, which can reduce the cost of the existing water meter and prolong the service life of the water meter.
The technical scheme adopted by the invention is as follows: the utility model provides an intelligence water gauge control circuit based on NB-IOT, includes the MCU system, and the MCU system is connected memory circuit, NFC circuit and NB modular circuit respectively, and the MCU system still passes through the connection with pulse metering circuit and power supply circuit respectively.
Preferably, the MCU system is realized by an R7F0C019L2DFB singlechip.
Preferably, the technical solution adopted by the present invention is further characterized in that,
the memory circuit is realized by a CAT24C256WI-GT3 chip, the NFC circuit is realized by an ST25DV chip of an intentional Semiconductor (ST), and the memory circuit and the NFC circuit are communicated with the MCU system by adopting I2C.
The NB module circuit and the MCU system communicate with the Internet of things platform in a UART serial port communication mode by using a CoAP protocol as an application layer protocol.
Preferably, the NB module circuit is realized by a BC95-B5 telecom version Internet of things communication module.
The NB module circuit comprises a module power supply circuit, a card circuit and an antenna circuit, wherein the voltage of the module power supply circuit is the same as that of the MCU system, the card circuit adopts a QFN-8 packaged sticking card, and the radio frequency circuit interface of the antenna circuit is in impedance matching with the antenna through 50 ohms in advance.
Preferably, the pulse metering circuit is connected with the MCU system through I2C, the pulse metering circuit is carried out in a reed switch pulse sampling mode, the pulse equivalent is 0.1, the two reed switches are opened and closed periodically in turn, and the period is 0.5 s.
The power supply circuit adopts 3.6v lithium battery power supply and auxiliary discharge capacitor to carry out the combination power supply, and supply voltage: 3.1V to 3.65V.
The invention has the beneficial effects that: in the design process of the system, the characteristics of the low power consumption mode of the single chip microcomputer and the PSM, DXR and other technologies of the NB module are utilized, the low-end of the designed water meter has ultralow power consumption, the power consumption of the terminal during static metering is lower than 10uA, the design requirement of the wireless water meter terminal for using for 7 years under the condition of battery power supply can be met, meanwhile, a reading controller and a concentrator are not needed during terminal deployment, the deployment cost is greatly reduced, and the management is convenient.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this application, illustrate embodiment(s) of the invention and together with the description serve to explain the invention without limiting the invention. In the drawings:
FIG. 1 is a schematic structural diagram of an intelligent water meter control circuit based on NB-IOT according to the present invention;
FIG. 2 is a block diagram of an MCU system of the present invention;
FIG. 3 is a pin layout diagram of the MCU system of the present invention;
fig. 4 is a circuit schematic of an NFC circuit of the present invention;
FIG. 5 is a circuit schematic of the memory circuit of the present invention;
FIG. 6 is a circuit schematic of the NB module circuit of the present invention;
FIG. 7 is a schematic circuit diagram of the pulse metering circuit of the present invention;
fig. 8 is a circuit schematic of the power circuit of the present invention.
In the figure: the circuit comprises an MCU (microprogrammed control Unit) system, a memory circuit, a NFC (near field communication) circuit, an NB module circuit, a pulse metering circuit, a power supply circuit, a card circuit and an antenna circuit, wherein the MCU system comprises 1, 2, a memory circuit, 3, an NFC circuit, 4, an NB module circuit, 5, a pulse metering circuit, 6, a power supply circuit, 7 and 8.
Detailed Description
The principles and features of this invention are described below in conjunction with the following drawings, which are set forth by way of illustration only and are not intended to limit the scope of the invention.
As shown in fig. 1, a schematic structural diagram of an intelligent water meter control circuit based on NB-IOT of the present invention includes an MCU system 1, where the MCU system 1 is connected to a memory circuit 2, an NFC circuit 3, and an NB module circuit 4, respectively, and the MCU system 1 is further connected to a pulse metering circuit 5 and a power supply circuit 6, respectively.
The MCU system 1 adopts an R7F0C019L2DFB singlechip of the Rysa and a program downloading and debugging interface. The R7F0C019L2DFB is a 16-bit singlechip, and is provided with a 64KB code flash memory and a 4KB RAM space to form on-chip storage. The R7F0C019L2DFB has three low power modes of operation: the power supply range of the HALT mode, the STOP mode and the SNOOZE mode is 1.6-5.5V, and the power supply system has the characteristics of low cost and ultralow power consumption.
And the R7F0C019L2DFB chip is packaged by LQFP 64. The block diagram and pin layout are shown in fig. 2 and 3, respectively.
The memory circuit 2 and the NFC circuit 3 both communicate with the MCU system 1 using I2C. The memory circuit 2 adopts a CAT24C256WI-GT3 chip, and the NFC circuit 3 adopts an ST25DV chip of an intentional Semiconductor (ST), so that the static power consumption of the two chips is low, and the two chips can communicate with the MCU system 1 by adopting I2C, and the use is convenient. The invention selects the memory circuit 2 with 256Kb specification. The circuit diagram of the NFC circuit 3 is shown in fig. 4, and the circuit diagram of the memory circuit 2 is shown in fig. 5.
The NFC technology operates at a frequency of 13.56MHz, short-range communication of 10cm, three transmission speeds of 106 Kbit/s, 212 Kbit/s and 424 Kbit/s. The method is suitable for short-distance communication application occasions. The communication principle is based on an induction near field, and in the near field area, the strength of the induction field is related to the distance between an electromagnetic radiation source and an antenna, and the strength of the induction field is weak when the induction field is close to the antenna. There are two read modes: active and passive. The interface application range is as follows: data reporting, data reading, parameter setting and program upgrading.
The NB module circuit 4 and the MCU system 1 communicate with the Internet of things platform by using a CoAP protocol as an application layer protocol through a UART serial port communication mode. The NB module circuit 4 is a BC95-B5 telecom version Internet of things communication module. The BC95 module has a total of 94 pins, 54 of which are LCC pins and the remaining 40 are LGA pins. The module group interface includes: power supply, serial port, USIM interface, RF interface.
NB module circuit 4 includes module power supply circuit, SIM card circuit (for short card circuit) 6 and antenna circuit 7, and NB module power supply voltage is the same with MCU system 1's voltage, and the disconnection of accessible IO mouth P01 pin control MOS pipe to the module is in the outage state at ordinary times, gives the module power supply when reporting as data, and the outage promptly is used up, reduction terminal system's that can be very big consumption. Meanwhile, the module is communicated with the MCU through a serial port, the TXD port of the BC95 is connected with a 1k ohm bridge resistor in series and then connected with a serial port P17 of the C019 singlechip, and the RXD port is connected with a 1k ohm resistor in series and connected with P00. The RF _ ANT pin is a radio frequency antenna interface of BC95, and the BC95-B5 also has an interface reserved for NB-IoT special S IM cards.
In the hardware design, in order to save the single-board hardware space, the SIM card uses a patch card packaged by QFN-8, and at the same time, it is necessary to specially pay attention to impedance matching of 50 ohms between the radio frequency circuit interface and the antenna. The BC95-B5 circuit schematic is shown in FIG. 6.
The three operating states of the NB module circuit 3 are as follows:
connected (Connected state)
The module is in the state after being registered and accessed to the network, can send and receive data, can enter an Idle mode after no data interaction exceeds a period of time, and can be configured in time.
Idle (Idle state)
The receiving downlink data can enter a Connected state, the PSM mode can be entered when no data interaction exceeds a period, and the time can be configured. The idle state may be configured to perform DRX or eDRX mode. DRX: discontinuous reception, discontinuous reception mode. The requirement on the time delay of downlink service is high, such as street lamps. eDRX: extended idle mode drx, Extended discontinuous reception mode. The downlink service delay has higher requirements, and messages can be cached or immediately issued according to whether the equipment is in a dormant state, such as intelligent wearable equipment.
PSM (energy saving mode)
In this mode, the terminal closes the transceiver and does not monitor paging of the wireless side, so that although the terminal is still registered in the network, signaling cannot be reached, downlink data cannot be received, and power is low. The duration is configured by the core network (T3412), and the Connected state is entered when there is uplink data to be transmitted or the TAU period ends.
The transition procedure for the general case of NB-IoT three states of operation can be summarized as follows:
1. after the terminal finishes sending data, the terminal is in a Connected state, starts an 'inactivity timer', defaults for 20 seconds, and has a configurable range of 1 s-3600 s;
when the 'inactivity Timer' is overtime, the terminal enters an Idle state, and an Active-Timer (T3324) is started, wherein the overtime configuration range is 2 seconds to 186 minutes;
when the Active-Timer is overtime, the terminal enters a PSM state, in the state, the terminal does not page, does not receive downlink data, is in a dormant state, and can return to an Active state by actively sending uplink data when the terminal is in the PSM state;
and 4, starting timing by the TAU Timer when the terminal enters an idle state, entering a Connected state when the TAU period is ended, and setting the configuration range of the TAU period (T3412) to be 54 minutes to 310 hours.
As shown in fig. 7, which is a schematic circuit diagram of the pulse metering circuit 5, the pulse metering circuit 5 is connected to the MCU system 1 through I2C, the pulse metering circuit 5 is implemented by using a reed switch pulse sampling method, the pulse equivalent is 0.1, the signaling coil structure of the pulse metering circuit 5 includes two reed switches with symmetrical positions, and the design and metering of the present subject is implemented by using a double reed switch pulse metering method. Pulse equivalent of 0.1m3. The reed switch has two states: closed state, open state. Sampling of the IO level is interrupted once for 0.5 s.
The two reed switches are opened and closed periodically in turn. "AB open state → A closed state, B open state → AB open state → B closed state, A open state → AB open state"The periodic opening and closing is an effective metering pulse (pulse output when closing), and the corresponding water quantity is 0.1m3。
As shown in fig. 8, which is a schematic circuit diagram of the power circuit 6, the power circuit 6 is powered by a combination of a 3.6v lithium battery and an auxiliary discharge capacitor, and the power supply voltage is: 3.1V to 3.65V.
The battery voltage detection is AD detection, and the battery voltage is divided by bR2 and bR4, and the detection is carried out 1 time every 1 minute. When the program continuously detects that the voltage is less than or equal to 3.0v for 2 times, judging the voltage is low, and setting a low voltage mark; and when the voltage is less than or equal to 3.2v, judging that the voltage is under-voltage, and setting a static under-voltage mark. And when the voltage is higher than 3.4V, the undervoltage or low-voltage mark is automatically cleared. Voltage detection range: the measurement range was 0-3.6V. The voltage detection precision is less than or equal to +/-0.1V.
The detection of battery power failure is IO port level detection, detection is carried out once every 0.5s, high power-up (30 times of confirmation) is carried out, and low power-down (2 times of confirmation) is carried out. Voltage detection and power failure detection share an IO port, normally are power failure detection, and switch into AD detection during voltage detection.
The invention solves the problems that the NB base station has unstable communication process, and the NB module can not enter the sleep mode immediately after the report of the water meter terminal data is finished, so that the NB module can continue to consume, and the power consumption of the terminal is improved. The processing mode is to establish a model according to the reporting time of the data flow of the service, and power off is carried out immediately after the data is sent, so that excessive power consumption caused by instability of the base station is fundamentally solved.
All the above optional technical solutions may be combined arbitrarily to form the optional embodiments of the present disclosure, and are not described herein again.
While the invention has been described with reference to specific embodiments, it will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.

Claims (8)

1. The utility model provides an intelligence water gauge control circuit based on NB-IOT, its characterized in that, includes MCU system (1), memory circuit (2), NFC circuit (3) and NB modular circuit (4) are connected respectively in MCU system (1), MCU system (1) still is connected with pulse metering circuit (5) and power supply circuit (6) respectively.
2. An intelligent water meter control circuit based on NB-IOT according to claim 1, characterized in that the MCU system (1) is implemented by an R7F0C019L2DFB single chip microcomputer.
3. An intelligent NB-IOT based water meter control circuit as claimed in claim 1, wherein the memory circuit (2) is implemented by a CAT24C256WI-GT3 chip, the NFC circuit (3) is implemented by an ST25DV chip of an intentional Semiconductor (ST), and both the memory circuit (2) and the NFC circuit (3) communicate with the MCU system (1) in an I2C manner.
4. The intelligent water meter control circuit based on the NB-IOT as claimed in claim 1, wherein the NB module circuit (4) and the MCU system (1) communicate with the platform of the Internet of things in a communication mode of UART serial port and using CoAP protocol as application layer protocol.
5. An intelligent water meter control circuit based on NB-IOT according to claim 4, characterized in that the NB module circuit (4) is a BC95-B5 telecom version Internet of things communication module.
6. An intelligent water meter control circuit based on NB-IOT according to claim 1, characterized in that, the NB module circuit (4) includes a module power supply circuit, a card circuit (7) and an antenna circuit (8), the card circuit (7) is realized by QFN-8 packaged card, and 50 ohm impedance matching is performed between the radio frequency circuit interface of the antenna circuit (8) and the antenna.
7. An intelligent water meter control circuit based on NB-IOT (NB-IOT) as claimed in claim 1, wherein the pulse metering circuit (5) is connected with the MCU system (1) in a communication manner of I2C, the pulse metering circuit (5) is implemented in a reed switch pulse sampling manner, the pulse equivalent is 0.1, the two reed switches are opened and closed periodically in turn, and the period is 0.5 s.
8. An intelligent water meter control circuit based on NB-IOT according to claim 1, characterized in that the power supply circuit (6) is powered by a combination of 3.6V lithium battery power supply and auxiliary discharge capacitor, and the power supply voltage is 3.1V-3.65V.
CN202010212520.4A 2020-03-24 2020-03-24 Intelligence water gauge control circuit based on NB-IOT Pending CN111385773A (en)

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CN111897560A (en) * 2020-08-27 2020-11-06 吉林大学 NB-IoT module-based program upgrading system, method, device and storage medium
CN114363999A (en) * 2021-12-10 2022-04-15 天翼物联科技有限公司 Internet of things downlink instruction sending method and device and storage medium

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CN114363999A (en) * 2021-12-10 2022-04-15 天翼物联科技有限公司 Internet of things downlink instruction sending method and device and storage medium
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