CN113063471A - NB-IoT intelligent gas meter based on OpenCPU technology - Google Patents
NB-IoT intelligent gas meter based on OpenCPU technology Download PDFInfo
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- G01F15/00—Details of, or accessories for, apparatus of groups G01F1/00 - G01F13/00 insofar as such details or appliances are not adapted to particular types of such apparatus
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Abstract
The invention discloses an OpenCPU technology-based NB-IoT intelligent gas meter, which solves the problems of complex structure, numerous interfaces, high cost and large development difficulty of the existing intelligent gas meter, and adopts the technical scheme that the key points of the technical scheme are that the intelligent gas meter comprises a base meter and an NB-IoT main control circuit board based on the OpenCPU technology; the base meter comprises a metering component, an intelligent head and an LCD display screen; the main control circuit board is integrally mounted on the intelligent head; the base meter also comprises a reed switch counter and a motor valve; the main control circuit board comprises an NB-IoT module circuit supporting an OpenCPU, a metering sampling circuit and a valve driving circuit; the NB-IoT intelligent gas meter based on the OpenCPU technology adopts a single module chip, replaces a traditional framework based on the OpenCPU technology, reduces complex interfaces, and is high in integration level, small in size and low in design complexity.
Description
Technical Field
The invention relates to an intelligent gas meter, in particular to an NB-IoT intelligent gas meter based on an OpenCPU technology.
Background
At present, the intelligent gas meter industry is basically a core framework of an MCU + Flash + NB-IoT module. The MCU is mainly responsible for system control of the whole gas meter, including metering sampling, LCD screen display, communication, valve switching, data storage and the like, and plays a role in controlling cooperation and specific working state among modules of the whole intelligent gas meter. When metering sampling is needed, the MCU is responsible for sampling and data processing; when the gas information of the meter end needs to be displayed on the LCD screen, the MCU undertakes the extraction and the control display of the gas information; when data information needs to be reported, the MCU firstly wakes up the NB module, then transmits the data needing to be reported to the NB module, and controls the NB module to report orderly according to a related protocol; when the switch valve needs to be controlled, the MCU is responsible for judging the state information of the meter end and controlling the motor valve driving chip to drive the valve to be normally switched.
And the Flash chip plays a role in data storage, so that data can be ensured not to be lost even if the power is down, and the integrity and consistency of the data when the MCU is restarted are ensured.
The module undertakes the function of system communication and plays a role of a bridge connecting the meter and the gas meter platform.
The prior art has the following disadvantages:
1) in the prior art, the core of the system is composed of three chips, so that the defects of numerous interfaces and low integration level exist. MCU and Flash need go the communication through the SPI interface, need go the communication through UART serial ports interface between MCU and the module, great promotion to MCU's requirement.
2) Because a plurality of interfaces are involved, when data of one interface is transmitted on the circuit board in error, the operation of the whole system is affected, and the anti-interference capability and reliability of the system are relatively low. It is therefore desirable for hardware designers to be familiar with device performance and at the same time be good at dealing with signal crosstalk issues on circuit boards to address the associated interference and reliability issues.
3) The core system in the prior art uses three chips, which has high cost and large volume.
4) In the prior art, the MCU is used as a control unit, and during design and development, not only bottom layer drive development but also a logic service layer is required to be developed, so that the project development period is long, the development difficulty is high, and the like.
Disclosure of Invention
The invention aims to provide an NB-IoT intelligent gas meter based on the OpenCPU technology, which adopts a single module chip and replaces the traditional framework based on the OpenCPU technology, thereby reducing complex interfaces, having high integration level, small volume and reduced design complexity.
The technical purpose of the invention is realized by the following technical scheme:
an NB-IoT intelligent gas meter based on OpenCPU technology comprises a base meter and is characterized in that: the system also comprises an NB-IoT main control circuit board based on the OpenCPU technology; the base meter comprises a metering component, an intelligent head and an LCD display screen; the main control circuit board is integrally mounted on the intelligent head;
the base meter also comprises a reed pipe counter coupled with the metering component and a motor valve;
the main control circuit board comprises an NB-IoT module circuit supporting an OpenCPU, a metering sampling circuit which is coupled between a reed switch counter and the NB-IoT module circuit supporting the OpenCPU and converts mechanical acquisition data into a level signal to be input into the NB-IoT module circuit supporting the OpenCPU, and a valve driving circuit which is coupled between the NB-IoT module circuit supporting the OpenCPU and a motor valve and is used for converting and outputting valve driving current; further comprising an NB-IoT module circuit coupled to the OpenCPU
Menu keys for manual awakening/reporting,
An infrared circuit for supporting the local parameter configuration and firmware upgrade of the meter,
An antenna module and an ESIM card circuit for remote communication,
A power supply circuit for supplying power,
And the power supply voltage monitoring circuit is used for monitoring the whole voltage.
Preferably, in summary, the invention has the following beneficial effects:
the OpenCPU technology is adopted, the resources in the NB-IoT module are utilized to design the intelligent gas meter, the core framework of the intelligent gas meter adopting the OpenCPU technology is only the NB-IoT module supporting the development of the OpenCPU, a single module chip realizes the original MCU + Flash + NB-IoT module architecture, and the design complexity is greatly reduced; meanwhile, the interfaces of the MCU and the Flash and the interfaces of the MCU and the NB-IoT module are communicated, the existing module supporting the development of the OpenCPU not only takes the control effect of the MCU, but also has the data storage function of the Flash, and meanwhile has the remote transmission function of the module, so that the control, storage and remote transmission are integrated, the integration level is high, the design is greatly simplified, and the stability of the system is improved.
Drawings
FIG. 1 is a schematic diagram of a gas meter base table;
FIG. 2 is a schematic circuit diagram of a main control circuit board;
FIG. 3 is a schematic diagram of a power supply voltage monitoring circuit;
FIG. 4 is a schematic diagram of a power supply circuit;
FIG. 5 is a schematic diagram of a valve drive circuit;
FIG. 6 is a schematic diagram of a metering sampling circuit;
FIG. 7 is a schematic diagram of a menu key circuit;
FIG. 8 is a schematic diagram of an infrared circuit;
FIG. 9 is an ESIM card circuit schematic;
fig. 10 is a schematic diagram of an NB-IoT module circuit supporting OpenCPU.
In the figure: 1. a base table; 2. a metering assembly; 3. an LCD display screen; 4. an intelligent head; 5. the main control circuit board.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings.
According to one or more embodiments, an NB-IoT intelligent gas meter based on the OpenCPU technology is disclosed, as shown in fig. 1, which includes a base table and an NB-IoT main control circuit board based on the OpenCPU technology. The base meter comprises a metering assembly, an intelligent head and an LCD display screen, and the main control circuit board is integrally installed on the intelligent head.
As shown in fig. 2, the base meter further includes a reed pipe counter coupled to the metering component and a motor valve, the main control circuit board includes an NB-IoT module circuit supporting the OpenCPU, a metering sampling circuit coupled between the reed pipe counter and the NB-IoT module circuit supporting the OpenCPU for converting the mechanical acquisition data into a level signal and inputting the level signal to the NB-IoT module circuit supporting the OpenCPU, and a valve driving circuit coupled between the NB-IoT module circuit supporting the OpenCPU and the motor valve for converting and outputting a valve driving current; the system also comprises a menu key which is coupled with an NB-IoT module circuit supporting an OpenCPU and used for manual awakening/reporting, an infrared circuit used for supporting a meter to perform local parameter configuration and firmware upgrading, an antenna module and an ESIM card circuit used for performing remote transmission communication, a power supply circuit used for supplying power and a power supply voltage monitoring circuit used for performing overall voltage monitoring.
As shown in fig. 3, the power supply voltage monitoring circuit includes two parts, namely power failure detection and voltage detection, and performs overall voltage monitoring on the gas meter power supply system. The power-down detection circuit comprises voltage-dividing resistors R1 and R2 and an external interrupt detection port V _ Monitor _ EN, wherein the voltage-dividing resistors R1 and R2 are sequentially coupled, and the external interrupt detection port V _ Monitor _ EN is coupled to a connection node of the voltage-dividing resistors R1 and R2. When the system supplies power normally, after the system voltage is divided by R1 and R2, V _ Monitor _ EN is detected as high level; after the system generates a power failure event, the V _ Monitor _ EN detects the power failure event as a low level, and whether the power failure event occurs is determined by judging the level of the V _ Monitor _ EN detection level. The voltage detection circuit consists of two networks of R4, R5, R6, Q1 devices and BAT _ V _ AD _ EN, BAT _ V _ AD. When voltage sampling is actually needed, the level of the BAT _ V _ AD _ EN network is firstly set to be 1, the collector and the emitter of the PNP triode Q1 are conducted, the system voltage is conducted to 3 pins through 2 pins of Q1, and returns to the ground after being divided by R6 and R5. Since the voltage drop between pins 2 and 3 of Q1 is almost 0 after Q1 is saturated and turned on, the voltage at the right end of R6 is approximately equal to the system voltage. The voltage value of the middle voltage division point of R5 and R6 is collected, and then restoration is carried out according to the voltage division ratio of R5 and R6, so that the power supply voltage of the system can be collected at the BAT _ V _ AD network point.
As shown in fig. 4, the power supply circuit mainly supplies power to the NB-IoT module supporting OpenCPU development, and also supplies power to the metering sampling circuit, the valve driving circuit, the menu button, and the infrared circuit. The power circuit mainly comprises capacitors C3, C4, C5 and C6, a resistor R3 and a chip U1. The chip U1 is an LDO chip with enable, preferably of type HE6236M5R, and mainly achieves the purpose of stabilizing the system voltage to 3.6V for the use of modules and other system peripherals. C5 and C6 are coupled in parallel to a pin 1 of a U1 of the chip and are power supply filter capacitors at an input end of the U1, C3 and C4 are coupled in parallel to a pin 5 of a U1 of the chip and are power supply filter capacitors at an output end of the U1, and R3 is a pull-up resistor on an enabling pin of the U1, so that the U1 is ensured to work all the time.
As shown in fig. 5, the valve drive circuit provides current drive to the electromechanical valve to open and close the valve. The circuit comprises capacitors C1, C2 and C7, resistors R7 and R8, a chip U2 and a valve interface J2. Wherein C1 is an energy storage capacitor of the valve driving chip, C2 is a power supply filter capacitor of the valve driving chip, C1 and C2 are coupled in parallel to a voltage VM pin of the chip U2, R7 is a current limiting resistor, C7 is a valve driving current voltage sampling filter capacitor, R8 is a sampling resistor of the valve driving current, the current limiting resistor R7 is connected in series to the filter capacitor C7, and is coupled in parallel to the sampling resistor R8 to pins 4 and 9 of the chip U2; u2 is a chip with current drive for the motor valve, preferably with the model DRV8837, and two pins of J2 are coupled to two output terminals of the chip U2, respectively, which are the valve wire interface of the motor valve. When the system needs to carry out the switching valve operation, the system informs a valve motor driving chip U2 through a related command, and the U2 generates a corresponding driving level which is transmitted to the motor valve through a J2 motor valve line interface to realize the switching valve operation. R8 is a sampling resistor, when a large current generated by the switch valve flows through R8, a pressure difference is generated on R8, the actual action current of the switch valve can be reduced by collecting the pressure difference at two ends of R8 and according to the resistance value of R8, and whether the switch valve is in place or not and whether the fault of the valve exists or not can be judged by comparing the sampling value with the electrical parameter of the motor valve.
As shown in fig. 6, the metering and sampling circuit provides electromechanical sampling of the gas meter, and is responsible for converting data acquired by the mechanical counter into a level signal for sampling by the module. The metering sampling circuit comprises pull-up resistors R10 and R12, filter capacitors C12 and C15 and a counter sampling interface P1. The pull-up resistors R10 and R12 are coupled to the sampling interface P1, one end of the filter capacitor C12 is coupled to the connection node of the pull-up resistor R10 and the sampling interface P1, the other end of the filter capacitor C15 is coupled to the ground, and one end of the filter capacitor C15 is coupled to the connection node of the pull-up resistor R12 and the sampling interface P1, the other end of the filter capacitor C3583 is coupled to the ground. When the gas meter normally uses gas, the mechanical counter on the meter can rotate, and after the magnetic steel on the counter passes through the reed switch, the reed switch can be attracted. When the metering function is not achieved, the Reed _ Switch _ sample0 is in a high level after being pulled up by the R10, the Reed _ Switch _ sample0 is changed into a low level after the metering function is achieved, and the OpenCPU module collects pulse levels. The Reed Switch Alarm has a metering Alarm function, when the outside has strong magnetism or other similar interferences, Reed switches 0 and Reed Switch Alarm at the rear ends of two networks can attract each other, and simultaneously, a low level is generated, and after the OpenCPU module collects the low level at the same time, the OpenCPU module can judge that the outside magnetic interferences exist.
As shown in fig. 7, the menu button functions to wake up the module and support manual reporting. The menu keys are composed of R11, C13 and SW 1. R11 is a pull-up resistor, C13 is a jitter elimination capacitor, and SW1 is a key switch. The pull-up resistor R11 and the jitter elimination capacitor C13 are sequentially connected in series between a power supply end and a ground end, one end of the key switch SW1 is coupled to a connection node of the pull-up resistor R11 and the jitter elimination capacitor C13, and the other end of the key switch SW1 is grounded; the NB-IoT module circuit supporting the OpenCPU is coupled to the SWITCH network line at the connection node of the pull-up resistor R11 and the jitter elimination capacitor C13 through a pin. When the key is not pressed, the SWITCH network is pulled up through R11 to be in a high level; when a key is pressed, the SWITCH network goes low because the key is turned on and is pulled down to ground. The OpenCPU module can realize the operation of identifying the key by acquiring the level on the SWITCH network. Because there is mechanical shake when pressing the key, can dispel the shake through increasing a and shake the electric capacity and dispel the shake.
As shown in fig. 8, the infrared circuit can support the meter to perform local parameter configuration, firmware upgrade, and the like. The infrared circuit comprises an isolation diode D3, a current limiting resistor R9, an infrared transmitting tube D2, an infrared receiving tube U3, a pull-up resistor R13, a current limiting resistor R14, a filter capacitor C14 and the like. The infrared emission part comprises a D2, R9 and D3, and comprises an isolation diode D3, a current-limiting resistor R9 and an infrared emission tube D2 which are sequentially connected in series, wherein the anode of the isolation diode D3 is coupled to a 38K _ MOD network for inputting 38KHz sine wave modulation waves, the cathode of the infrared emission tube D2 is coupled to an NB-IoT module circuit supporting an OpenCPU through an IR _ TX network circuit, when infrared communication is required, an OpenCPU module activates an infrared circuit, 38KHz sine wave modulation waves are input at the 38K _ MOD network at the left end of D3, and data (configuration parameters) required to be issued are input at the IR _ TX network part at the right end of D2, so that infrared modulation emission of the configuration parameters is realized. And R9 is a current-limiting resistor and is used for adjusting the infrared emission power.
The receiving part of the infrared circuit consists of R13, R14, C14 and U3, one end of a pull-up resistor R13 is coupled with the other end of the output end of the infrared receiving tube U3 and grounded, one end of a current-limiting resistor is coupled with the other end of the power supply end of the infrared receiving tube U3 and grounded, and a filter capacitor is coupled with the power supply end of the infrared receiving tube U3 and connected in parallel with the current-limiting resistor R14; the NB-IoT module circuit supporting the OpenCPU is coupled to the IR _ RX network line and the IR _ RX _ PWR network line; the IR _ RX _ PWR network line is coupled to a connection node between the IR receiving tank U3 and the pull-up resistor R13, and the IR _ RX _ PWR network line is coupled to a connection node between the current limiting resistor and ground. When infrared receiving is required, the OpenCPU module firstly sets the level of an IR _ RX _ PWR network terminal high, turns on the infrared receiving module, starts a receiving mode, and after the infrared receiving module receives infrared light modulated by 38KH, the interior of the module is firstly filtered and shaped, then related demodulation operation is carried out, and finally, the infrared receiving module is restored to configuration parameters and commands required to be known, and the whole infrared receiving process is completed. Wherein, R14 is the current-limiting resistor to adjust the receiving power of the infrared receiving module, C14 is IR _ RX _ PWR, the filter circuit on the network line plays a role of voltage stabilization, and R13 is the pull-up resistor of the IR _ RX network end to pull up the IR _ RX network level as the reference level of receiving, which is convenient for demodulation and receiving.
As shown in fig. 9, the ESIM card circuit is a part of the module remote communication circuit for supporting module remote communication. The ESIM card circuit consists of C16, C17, C18, C19, 4 decoupling capacitors and an ESIM card chip. The ESIM card chip is an embedded SIM card, namely, a traditional SIM card is integrated on an equipment chip, and data interaction between the OpenCPU module and the base station is realized. The C16, C17, C18 and C19 ensure the decoupling of the data interaction network between the module and the base station, and ensure the stability and reliability of the communication network.
As shown in fig. 10, the NB-IoT module supporting OpenCPU development supports control of all peripheral devices, and also supports sampling measurement, storage of status data, and remote communication at the module end. The NB-IoT module circuit supporting the OpenCPU comprises an MOD-A and a chip MOD-B, and further comprises a power supply filter circuit, a reset circuit and an antenna matching circuit. The power supply filter circuit C8 is an energy storage capacitor, the power supply filter circuits C9, C10 and C11 are filter capacitors, the energy storage capacitor C8 and the filter capacitors C9, C10 and C11 are grounded and connected in parallel, and a connection node coupled to a power supply is connected to a voltage VBAT pin of the module chip MOD-a. The RESET circuit comprises a RESET switch KEY1 and a filtering jitter elimination capacitor C20 which are connected in parallel, the RESET circuit is coupled to a RESET pin of the chip MOD-A, a pull-up resistor is arranged in the module, the normal RESET pin is at a high level, when the RESET is needed, a low-level pulse is generated on the RESET pin when the KEY1 is pressed, the module enters a RESET state, and the C20 is the filtering jitter elimination capacitor. The antenna matching circuit comprises a pi network consisting of R15, R16 and R17 and an antenna transmitting end SMA interface seat J3, and plays a role in matching signals and wirelessly transmitting signals. And the NB-IoT module of the OpenCPU performs core control and simultaneously bears corresponding remote transmission functions. The NB-IoT module of the OpenCPU manages control circuits such as metering sampling, valve action, infrared configuration, key detection, power supply voltage monitoring and the like. When the report needs to be reported regularly, the NB-IoT module of the OpenCPU is switched back to the function of the NB module, and the antenna circuit is matched with the ESIM card circuit to bear the remote transmission function together.
The existing technology generally carries out asynchronous communication between the MCU and the NB module. Because the clock sources on both sides are not the same clock source (the MCU terminal is the crystal oscillator A as the clock source, and the NB module terminal is the crystal oscillator B as the clock source), the offsets of the two clock sources affected by the temperature are different after the high temperature or the low temperature exists, and the communication is poor or the communication is not possible at all. To solve this problem, the prior art introduces a communication mode of a synchronization mode, and achieves theoretical synchronization by adjusting a software policy. Although the communication between the MCU and the NB module is greatly reduced by the influence of temperature after the synchronization mode is introduced, in extreme cases, there is still a mismatch phenomenon and there is still a certain risk. In the prior art, a module communicates with an MCU through a serial port, if information of a table end is intercepted maliciously between an MCU end and an NB module by a user, and after sensitive information (such as money amount and gas consumption) of the table end is cracked, table parameters are modified maliciously, so that information leakage and economic loss of a gas company are caused. The existing mode can not monitor and can not prevent illegal interception.
The OpenCPU is that the communication core (analogy NB module) and the control core (analogy MCU) are integrated, synchronous communication is realized on the physical layer, the influence of high and low temperature on serial communication is essentially counteracted, and the condition of error code additionally introduced due to the change of high and low temperature is not caused at all. And because the mode that the control core and the communication core are adopted and the dual cores coexist is adopted, the control core and the communication core are the same chip, and no MCU module or NB module exists, the physical link on the bright surface does not exist at all, and the illegal attack cannot bounce. And the control core (core A) collects the information collected to the table end and stores the information in the data field of Flash. After receiving the information reporting instruction, the communication core (core B) extracts the information to be reported by the core A from the data domain of the Flash, then performs packaging processing according to the network access protocol of the core B, and uploads the information to the platform of the gas company through the NB network. At this time, the core a does not need to know a large number of processes and protocols related to network access, and only needs to store the acquired data in Flash, so that the design is greatly simplified, and the stability of the system is greatly improved. And the core of logic control in the OpenCPU is a blank core, and what functions are needed by a gas meter manufacturer is cut and defined according to the needed requirements, so that the degree of freedom is high, and the utilization and planning of resources are greatly improved. The traditional MCU chip kernel can define a plurality of interfaces and has wide and complete content, but when the MCU chip is used for developing a gas meter, only about half of all the interfaces are used, and the resource waste is greatly caused.
The present embodiment is only for explaining the present invention, and it is not limited to the present invention, and those skilled in the art can make modifications of the present embodiment without inventive contribution as needed after reading the present specification, but all of them are protected by patent law within the scope of the claims of the present invention.
Claims (8)
1. An NB-IoT intelligent gas meter based on OpenCPU technology comprises a base meter and is characterized in that: the system also comprises an NB-IoT main control circuit board based on the OpenCPU technology; the base meter comprises a metering component, an intelligent head and an LCD display screen; the main control circuit board is integrally mounted on the intelligent head;
the base meter also comprises a reed pipe counter coupled with the metering component and a motor valve;
the main control circuit board comprises an NB-IoT module circuit supporting an OpenCPU, a metering sampling circuit which is coupled between a reed switch counter and the NB-IoT module circuit supporting the OpenCPU and converts mechanical acquisition data into a level signal to be input into the NB-IoT module circuit supporting the OpenCPU, and a valve driving circuit which is coupled between the NB-IoT module circuit supporting the OpenCPU and a motor valve and is used for converting and outputting valve driving current; further comprising an NB-IoT module circuit coupled to the OpenCPU
Menu keys for manual awakening/reporting,
An infrared circuit for supporting the local parameter configuration and firmware upgrade of the meter,
An antenna module and an ESIM card circuit for remote communication,
A power supply circuit for supplying power,
And the power supply voltage monitoring circuit is used for monitoring the whole voltage.
2. The NB-IoT intelligent gas meter based on the OpenCPU technology as claimed in claim 1, wherein: the NB-IoT module circuit supporting the OpenCPU comprises a chip MOD-A and a chip MOD-B, and further comprises a power supply filter circuit, a reset circuit and an antenna matching circuit which are coupled with the chip MOD-A
The power supply filter circuit comprises a capacitor C9, a capacitor C10, a capacitor C11 and a capacitor C8 which are connected in parallel and used for filtering, wherein the capacitor C8 is used for storing energy; the power supply filter circuit is coupled to a voltage VBAT pin of the chip MOD-A;
the RESET circuit comprises a RESET switch KEY1 and a filtering and jitter eliminating capacitor C20 which are connected in parallel, and the RESET circuit is coupled to a RESET pin of the chip MOD-A;
the antenna matching circuit comprises an n-shaped network consisting of R15, R16 and R17 and an antenna transmitting end SMA interface seat J3; the antenna matching circuit is coupled to an antenna RF _ ANT pin of the chip MOD-A.
3. The OpenCPU technology-based NB-IoT smart gas meter according to claim 2, wherein: the menu key comprises a key switch SW1, a pull-up resistor R11 and a jitter elimination capacitor C13; the pull-up resistor R11 and the jitter elimination capacitor C13 are sequentially connected in series between a power supply end and a ground end, one end of the key switch is coupled to a connection node of the pull-up resistor R11 and the jitter elimination capacitor C13, and the other end of the key switch is grounded; the OpenCPU-enabled NB-IoT module circuit is coupled to the SWITCH network line at the connection node of the pull-up resistor R11 and the jitter elimination capacitor C13 through pins.
4. The OpenCPU technology-based NB-IoT intelligent gas meter according to claim 3, wherein: the infrared circuit comprises a receiving part and a transmitting part;
the emitting part comprises an isolation diode D3, a current limiting resistor R9 and an infrared emitting tube D2 which are sequentially connected in series; the anode of the isolation diode D3 is coupled to a 38K _ MOD network for inputting 38KHz sine wave modulation waves, and the cathode of the infrared emission tube D2 is coupled to the OpenCPU supporting NB-IoT module circuit through an IR _ TX network circuit;
the receiving part comprises an infrared receiving tube U3, a pull-up resistor R13, a current-limiting resistor R14 and a filter capacitor C14, wherein one end of the pull-up resistor R13 is coupled with the other end of the output end of the infrared receiving tube U3 and is grounded, one end of the current-limiting resistor is coupled with the power end of the infrared receiving tube U3 and is grounded, and the filter capacitor is coupled with the power end of the infrared receiving tube U3 and is connected with the current-limiting resistor R14 in parallel; the OpenCPU-supporting NB-IoT module circuit is coupled to the IR _ RX network line and the IR _ RX _ PWR network line; the IR _ RX _ PWR network line is a connection node coupled to the IR receiving tank U3 and the pull-up resistor R13, and the IR _ RX _ PWR network line is a connection node coupled to the current limiting resistor and the ground.
5. The OpenCPU technology-based NB-IoT intelligent gas meter according to claim 4, wherein: the ESIM card circuit comprises an ESIM card chip and decoupling capacitors C16, C17, C18 and C19 which are respectively coupled to the ESIM card chip; the ESIM card chip is an embedded SIM card.
6. The OpenCPU technology-based NB-IoT smart gas meter according to claim 5, wherein: the power circuit comprises a chip U1, power filter capacitors C5 and C6 which are coupled to the input end of the chip U1 in parallel, power filter capacitors C3 and C4 which are coupled to the output end of the chip U in parallel, and a pull-up resistor R3 which is coupled to an enable pin of the chip U1.
7. The NB-IoT intelligent gas meter based on the OpenCPU technology as claimed in claim 1, wherein: the metering sampling circuit comprises a counter sampling interface P1, a pull-up resistor R10 and a pull-up resistor R12 which are coupled to the sampling interface P1, a filter capacitor C12 of which one end is coupled to the connection node of the pull-up resistor R10 and the sampling interface P1 and the other end is grounded, and a filter capacitor C15 of which one end is coupled to the connection node of the pull-up resistor R12 and the sampling interface P1 and the other end is grounded.
8. The NB-IoT intelligent gas meter based on the OpenCPU technology as claimed in claim 1, wherein: the valve driving circuit comprises a chip U2 for driving the current of the motor valve, a J2 motor valve wire interface coupled to an output port of the chip U2 and connected to a motor valve realization switch in a transmission mode, an energy storage capacitor C1 and a filter capacitor C2 which are connected in parallel and then coupled to a voltage pin of the chip U2 for energy storage and power supply filtering, a sampling resistor R8 coupled to the ground end of the chip U2 for current sampling, a current limiting resistor R7 connected in parallel to the resistor R8 for current limiting, and a filter capacitor C7 connected in series to the resistor R7 for sampling filtering.
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116138750A (en) * | 2022-12-26 | 2023-05-23 | 嘉兴华炳物联网科技有限公司 | A intelligent wrist-watch for human health monitoring |
Citations (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2012100686A1 (en) * | 2011-01-25 | 2012-08-02 | Shao Zehua | Internet of things intelligent gas meter and control system thereof |
| CN207231572U (en) * | 2017-08-28 | 2018-04-13 | 新天科技股份有限公司 | NB Internet of Things gas meter, flow meters |
| CN208580494U (en) * | 2018-06-13 | 2019-03-05 | 北京京仪仪器仪表研究总院有限公司 | A kind of low power-consumption intelligent gas meter, flow meter auxiliary device based on NB-IoT technology |
| CN209961280U (en) * | 2019-04-21 | 2020-01-17 | 优艾特仪表科技成都有限公司 | NB-IoT (network B-IoT) Internet of things gas meter |
| CN211293697U (en) * | 2020-01-08 | 2020-08-18 | 浙江联芯物联网科技有限公司 | Positioning information acquisition system based on NB-IOT chip OpenCPU scheme |
| CN111583570A (en) * | 2019-12-25 | 2020-08-25 | 浙江联芯物联网科技有限公司 | Intelligent smoke detector based on NB-IoT technology OpenCPU development platform and communication system thereof |
| CN211552945U (en) * | 2020-01-07 | 2020-09-22 | 浙江荣鑫智能仪表股份有限公司 | Gas meter with battery power failure detection function |
| CN211552939U (en) * | 2020-01-09 | 2020-09-22 | 浙江荣鑫智能仪表股份有限公司 | Ultrasonic gas meter with multistage gas protection |
| CN211878248U (en) * | 2020-03-14 | 2020-11-06 | 济南驰昊电力科技有限公司 | Optical cable joint box monitoring device based on NB technology |
| CN112017364A (en) * | 2020-08-28 | 2020-12-01 | 浙江威星智能仪表股份有限公司 | Intelligent gas meter with NB-IoT module embedded with custom program |
| CN112235742A (en) * | 2020-09-08 | 2021-01-15 | 深圳市燃气集团股份有限公司 | Gas meter with NB-IoT communication module embedded with program and data processing method |
| CN212432258U (en) * | 2020-06-12 | 2021-01-29 | 杭州绿鲸科技有限公司 | Intelligent gas meter based on NB-IOTopencpu technology |
-
2021
- 2021-03-23 CN CN202110307698.1A patent/CN113063471A/en active Pending
Patent Citations (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2012100686A1 (en) * | 2011-01-25 | 2012-08-02 | Shao Zehua | Internet of things intelligent gas meter and control system thereof |
| CN207231572U (en) * | 2017-08-28 | 2018-04-13 | 新天科技股份有限公司 | NB Internet of Things gas meter, flow meters |
| CN208580494U (en) * | 2018-06-13 | 2019-03-05 | 北京京仪仪器仪表研究总院有限公司 | A kind of low power-consumption intelligent gas meter, flow meter auxiliary device based on NB-IoT technology |
| CN209961280U (en) * | 2019-04-21 | 2020-01-17 | 优艾特仪表科技成都有限公司 | NB-IoT (network B-IoT) Internet of things gas meter |
| CN111583570A (en) * | 2019-12-25 | 2020-08-25 | 浙江联芯物联网科技有限公司 | Intelligent smoke detector based on NB-IoT technology OpenCPU development platform and communication system thereof |
| CN211552945U (en) * | 2020-01-07 | 2020-09-22 | 浙江荣鑫智能仪表股份有限公司 | Gas meter with battery power failure detection function |
| CN211293697U (en) * | 2020-01-08 | 2020-08-18 | 浙江联芯物联网科技有限公司 | Positioning information acquisition system based on NB-IOT chip OpenCPU scheme |
| CN211552939U (en) * | 2020-01-09 | 2020-09-22 | 浙江荣鑫智能仪表股份有限公司 | Ultrasonic gas meter with multistage gas protection |
| CN211878248U (en) * | 2020-03-14 | 2020-11-06 | 济南驰昊电力科技有限公司 | Optical cable joint box monitoring device based on NB technology |
| CN212432258U (en) * | 2020-06-12 | 2021-01-29 | 杭州绿鲸科技有限公司 | Intelligent gas meter based on NB-IOTopencpu technology |
| CN112017364A (en) * | 2020-08-28 | 2020-12-01 | 浙江威星智能仪表股份有限公司 | Intelligent gas meter with NB-IoT module embedded with custom program |
| CN112235742A (en) * | 2020-09-08 | 2021-01-15 | 深圳市燃气集团股份有限公司 | Gas meter with NB-IoT communication module embedded with program and data processing method |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116138750A (en) * | 2022-12-26 | 2023-05-23 | 嘉兴华炳物联网科技有限公司 | A intelligent wrist-watch for human health monitoring |
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