Valve control water meter circuit with dual-mode communication

Abstract

The utility model relates to a valve control water meter circuit with a dual-mode communication function, which comprises a power supply control module, a wireless remote transmission module, a level conversion module, a Bluetooth chip main control module and a motor driving module, and is characterized in that a first communication port of the wireless remote transmission module is connected with a first communication port of the level conversion module; a second communication port of the level conversion module is connected with a communication port of the Bluetooth chip main control module, a signal output end of the Bluetooth chip main control module is connected with a signal input end of the motor driving module, and the wireless remote transmission module provides high-speed data transmission and good mobility by utilizing a Cat.1 technology. The Bluetooth chip main control module is connected with the level conversion module through a first communication port to realize the communication protocol and level adaptation with the Bluetooth chip main control module; and the level conversion module converts the received signal into a format suitable for the Bluetooth chip main control module, and the Bluetooth chip main control module processes the signal and then controls the motor driving module, so that the accurate control on the water meter valve is realized.

Description

Technical Field

[0001] The present application relates to the field of valve-controlled water meter circuits, and in particular to a valve-controlled water meter circuit with dual-mode communication. Background Art

[0002] Traditional valve-controlled water meter circuits mostly use a single communication technology. However, the single communication method limits the remote monitoring and control capabilities of the water meter, making it impossible to achieve rapid response and real-time data transmission, and it is difficult to adapt to current application scenarios with extremely high real-time requirements. Secondly, a single communication technology has blind spots in signal coverage, especially in remote areas or environments with strong signal interference, which directly affects the communication quality and stability of the water meter. The lack of stability leads to data transmission interruptions or errors, which in turn affects the metering accuracy of the water meter and the user experience. Utility Model Content

[0003] In order to solve the problem that traditional valve-controlled water meter circuits mostly use a single communication technology, resulting in low communication quality and stability, the present application provides a valve-controlled water meter circuit with dual-mode communication.

[0004] The present application provides a valve-controlled water meter circuit with dual-mode communication, which adopts the following technical solution:

[0005] A valve-controlled water meter circuit with dual-mode communication, the valve-controlled water meter circuit comprising a power control module connected to a power supply, a wireless remote transmission module, a level conversion module, a Bluetooth chip main control module and a motor drive module, wherein a first communication port of the wireless remote transmission module is connected to a first communication port of the level conversion module, a second communication port of the level conversion module is connected to a communication port of the Bluetooth chip main control module, a signal output end of the Bluetooth chip main control module is connected to a signal input end of the motor drive module, the signal output end of the motor drive module outputs a signal to control the opening or closing of the valve-controlled water meter, and a power output end of the power control module outputs power for power supply.

[0006] By adopting the above technical solution, the valve-controlled water meter circuit described in the above paragraph solves the communication quality and stability problems caused by the single communication mode of the traditional water meter circuit by integrating dual-mode communication technology. The wireless remote transmission module uses Cat.1 technology to provide high-speed data transmission and good mobility, and is connected to the level conversion module through the first communication port to realize the communication protocol and level adaptation with the Bluetooth chip main control module; the level conversion module converts the received signal into a format suitable for the Bluetooth chip main control module and sends it through the second communication port; after processing the signal, the Bluetooth chip main control module controls the motor drive module to achieve precise control of the water meter valve; at the same time, the power control module intelligently manages the power supply to ensure the stable operation of the entire system. The data transmission rate is improved and the communication delay is reduced, the stability and reliability of the communication are enhanced, and the normal communication and control of the water meter can be maintained even in poor signal coverage or mobile environments, meeting the needs of modern smart water meters for efficient communication.

[0007] Preferably, the wireless remote transmission module includes a wireless remote transmission chip UB1, and the wireless remote transmission chip UB1 is a Cat.1 wireless communication module.

[0008] By adopting the above technical solution, the wireless remote transmission chip UB1 is used as a Cat.1 wireless communication module, and its technical effect is to provide a high-speed, stable and highly compatible communication capability, allowing valve-controlled water meters to achieve faster remote data transmission and more reliable network connections, thereby significantly improving the remote monitoring, control and data management capabilities of smart water meters.

[0009] Preferably, the level conversion module includes a first level matching unit, a second level matching unit, a first signal isolation unit and a second signal isolation unit. The first communication port of the wireless remote transmission module is connected to the first communication port of the first level matching unit, the second communication port of the first level matching unit is connected to the communication port of the Bluetooth chip main control module, the wake-up signal port of the wireless remote transmission module is connected to the first end of the first signal isolation unit, the second end of the first signal isolation unit is connected to the interrupt trigger port of the Bluetooth chip main control module, the first reset signal port of the wireless remote transmission module is connected to the first end of the second signal isolation unit, the second end of the second signal isolation unit is connected to the general input / output port of the Bluetooth chip main control module, the second reset signal port of the wireless remote transmission module is connected to the first communication port of the second level matching unit, and the second communication port of the second level matching unit is connected to the reset port of the Bluetooth chip main control module.

[0010] By adopting the above technical solution, the level conversion module realizes effective level matching and safe signal isolation between the wireless remote transmission module and the Bluetooth chip main control module through an integrated level matching and signal isolation unit. The technical effect is to enhance the anti-interference ability of the system and ensure the integrity and reliability of the signal. At the same time, through precise level conversion and isolation protection, the stability and communication efficiency of the entire valve-controlled water meter circuit are improved.

[0011] Preferably, the first level matching unit includes a resistor R49, a resistor R51, a transistor Q6 and a transistor Q10, the first communication port of the wireless remote transmission module includes a narrowband transmission port, a narrowband receiving port, a 4G communication transmission port and a 4G communication receiving port, the communication port of the Bluetooth chip main control module includes an MCU transmission port and an MCU receiving port, the common node between the narrowband transmission port and the 4G communication transmission port is connected to the emitter of the transistor Q6, the collector of the transistor Q6 is connected to the MCU receiving port, and the transistor The base of transistor Q6 is connected to the enable control end of the wireless remote transmission module, the resistor R49 is located between the collector of the transistor Q6 and the power output end of the power control module, the MCU sending port is connected to the emitter of the transistor Q10, the collector of the transistor Q10 is respectively connected to the narrowband receiving port and the 4G communication receiving port, the base of the transistor Q10 is connected to the enable control end of the wireless remote transmission module, and the resistor R51 is located between the collector of the transistor Q10 and the power output end of the power control module.

[0012] By adopting the above technical solution, the level conversion module realizes accurate level matching and signal routing between the narrowband and 4G communication ports of the wireless remote transmission module and the MCU port of the Bluetooth chip main control module through carefully designed resistors and transistor circuits. The technical effect is to ensure seamless compatibility and efficient communication between different communication technologies. At the same time, by enabling the linkage of the control end, flexible control of the wireless communication module is realized, thereby improving the communication efficiency and reliability of the entire valve-controlled water meter circuit.

[0013] Preferably, the first signal isolation unit includes a diode D11, the wake-up signal port of the wireless remote transmission module is connected to the positive terminal of the diode D11, and the negative terminal of the diode D11 is connected to the interrupt trigger port of the Bluetooth chip main control module.

[0014] By adopting the above technical solution, the first signal isolation unit realizes unidirectional signal transmission and electrical isolation between the wake-up signal port of the wireless remote transmission module and the interrupt trigger port of the Bluetooth chip main control module through the diode D11. The technical effect is to enhance the anti-interference ability of the system, ensure the stable transmission of the wake-up signal, and protect the Bluetooth chip from potential reverse current or voltage shocks, thereby improving the stability and safety of the entire valve-controlled water meter circuit.

[0015] Preferably, the second signal isolation unit includes a diode D9, the first reset signal port of the wireless remote transmission module is connected to the positive terminal of the diode D9, and the negative terminal of the diode D9 is connected to the universal input / output port of the Bluetooth chip main control module.

[0016] By adopting the above technical solution, the second signal isolation unit realizes signal isolation and directional transmission between the first reset signal port of the wireless remote transmission module and the general input / output port of the Bluetooth chip main control module through the diode D9. The technical effect is to ensure the correct unidirectional transmission of the reset signal and prevent potential reverse current damage, thereby enhancing the reliability of the system and the protection of the Bluetooth chip.

[0017] Preferably, the second level matching unit includes a transistor Q9 and a resistor R40, the reset port of the Bluetooth chip main control module is connected to the collector of the transistor Q9, the emitter of the transistor Q9 is connected to the second reset signal port of the wireless remote transmission module, and the resistor R40 is located between the base of the transistor Q9 and the enable control end of the wireless remote transmission module.

[0018] By adopting the above technical solution, the second level matching unit realizes the level conversion and signal matching between the second reset signal port of the wireless remote transmission module and the reset port of the Bluetooth chip main control module through the cooperation of the transistor Q9 and the resistor R40. The technical effect is to ensure that the reset signal is correctly and stably transmitted between modules with different level requirements, and realize the enable control of the transistor base through the resistor R40, thereby improving the signal compatibility of the system and the reliability of the reset operation.

[0019] Preferably, the power control module includes a MOS tube M2, a resistor R12, a resistor R13, a boost chip UM1 and a transistor Q5, the source of the MOS tube M2 is connected to the power supply, the drain of the MOS tube M2 serves as the first power output end of the power control module to output a 3.6V voltage for power supply, the drain of the MOS tube M2 is connected to the power input end of the boost chip UM1, the power output end of the boost chip UM1 serves as the second power output end of the power control module to output a 3.8V voltage for power supply, and the M The drain of the MOS tube M2 is connected to the first end of the resistor R13, the second end of the resistor R13 is connected to the first end of the resistor R12, the second end of the resistor R12 is grounded, the common node between the second end of the resistor R13 and the first end of the resistor R12 is connected to the voltage acquisition port of the Bluetooth chip main control module, the voltage adjustment port of the Bluetooth chip main control module is connected to the base of the transistor Q5, the drain of the MOS tube M2 is connected to the collector of the transistor Q5, and the emitter of the transistor Q5 is grounded.

[0020] By adopting the above technical solution, the power control module realizes stable output and regulation of the power supply voltage through the cooperation of the MOS tube M2, the boost chip UM1 and the precision resistors R12 and R13. At the same time, the voltage collection and regulation function of the Bluetooth chip main control module is realized through the transistor Q5. The technical effect is to ensure the power supply stability of the entire valve-controlled water meter circuit and the precise control of the voltage level, thereby improving the power management efficiency of the system and the reliability of the circuit.

[0021] Preferably, the first power output end of the power control module is connected to a DC-DC conversion module, and the DC-DC conversion module includes an inductor L5, an inductor L6, a capacitor C9, a capacitor C10, a capacitor C11 and a capacitor C12. The first power output end of the power control module is connected to the first end of the inductor L5, the capacitor C9 is located between the second end of the inductor L5 and the ground, the capacitor C10 is located between the second end of the inductor L5 and the ground, and a common node between the second end of the inductor L5 and the capacitor C10 serves as a first voltage output end of the DC-DC conversion module. The first power output end of the power control module is connected to the first end of the inductor L6, the capacitor C11 is located between the second end of the inductor L6 and the ground, the capacitor C12 is located between the second end of the inductor L6 and the ground, and a common node between the second end of the inductor L6 and the capacitor C12 serves as a second voltage output end of the DC-DC conversion module.

[0022] By adopting the above technical solution, the DC-DC conversion module integrated in the power control module realizes efficient voltage conversion and stable output through the coordinated work of inductors L5, L6 and capacitors C9, C10, C11, and C12. The technical effect is that two stable voltage output terminals are provided, ensuring that different parts of the circuit can obtain the required precise voltage, thereby enhancing the power supply stability and efficiency of the entire valve-controlled water meter circuit.

[0023] Preferably, the valve-controlled water meter circuit further includes a SIM card module, and a SIM communication port of the SIM card module is connected to the second communication port of the wireless remote transmission module.

[0024] By adopting the above technical solution, the SIM card module integrated in the valve-controlled water meter circuit is connected to the second communication port of the wireless remote transmission module. The technical effect is to realize the direct connection and data transmission between the water meter and the mobile communication network, provide a stable and reliable remote communication means, and enhance the intelligence level of the water meter and the remote monitoring and management capabilities.

[0025] In summary, the present application includes at least one of the following beneficial technical effects:

[0026] 1. The valve-controlled water meter circuit solves the communication quality and stability problems caused by the single communication mode of the traditional water meter circuit by integrating dual-mode communication technology. The wireless remote transmission module uses Cat.1 technology to provide high-speed data transmission and good mobility, and is connected to the level conversion module through the first communication port to realize the communication protocol and level adaptation with the Bluetooth chip main control module; the level conversion module converts the received signal into a format suitable for the Bluetooth chip main control module and sends it through the second communication port; after the Bluetooth chip main control module processes the signal, it controls the motor drive module to achieve precise control of the water meter valve; at the same time, the power control module intelligently manages the power supply to ensure the stable operation of the entire system. It improves the data transmission rate and reduces the communication delay, enhances the stability and reliability of the communication, and can maintain normal communication and control of the water meter even in poor signal coverage or mobile environments, meeting the needs of modern smart water meters for efficient communication;

[0027] 2. Compared with existing technologies, such as NB-IoT, Cat.1 wireless communication modules have the following advantages: NB-IoT is suitable for scenarios where only a small amount of data is transmitted and the device is in a fixed state; a typical case is three meters (water meter, electricity meter, gas meter); Cat.1 wireless communication modules can not only transmit larger data, but also have good mobility and voice functions; specifically, Cat.1 wireless communication modules have higher internal integration and stronger functions. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1It is a flow chart of a valve-controlled water meter circuit with dual-mode communication according to an embodiment of the present application.

[0029] Figure 2 It is a partial circuit diagram of the motor drive module of the embodiment of the present application.

[0030] Figure 3 It is a partial circuit diagram of the wireless remote transmission module of the embodiment of the present application.

[0031] Figure 4 It is a partial circuit diagram of the first level matching unit in an embodiment of the present application.

[0032] Figure 5 It is a partial circuit diagram of the first signal isolation unit in an embodiment of the present application.

[0033] Figure 6 It is a partial circuit diagram of the second signal isolation unit in an embodiment of the present application.

[0034] Figure 7 It is a partial circuit diagram of the second level matching unit in an embodiment of the present application.

[0035] Figure 8 It is a partial circuit diagram of the DC-DC conversion module of the embodiment of the present application.

[0036] Fig. 9 It is a partial circuit diagram of the power control module of the embodiment of the present application.

[0037] Fig.10 It is a partial circuit diagram of the Bluetooth chip main control module of the embodiment of the present application.

[0038] Fig.11 It is a partial circuit diagram of the SIM card module of the embodiment of the present application. DETAILED DESCRIPTION

[0039] The following is combined with Figure 1-11 This application is described in further detail.

[0040] like Figure 1 As shown, a valve-controlled water meter circuit with dual-mode communication includes a power control module connected to a power supply, a wireless remote transmission module, a level conversion module, a Bluetooth chip main control module and a motor drive module. The first communication port of the wireless remote transmission module is connected to the first communication port of the level conversion module, the second communication port of the level conversion module is connected to the communication port of the Bluetooth chip main control module, the signal output end of the Bluetooth chip main control module is connected to the signal input end of the motor drive module, the signal output end of the motor drive module outputs a signal to control the opening or closing of the valve-controlled water meter, and the power output end of the power control module outputs power for power supply.

[0041] In this embodiment, the valve-controlled water meter circuit described in the above paragraph solves the communication quality and stability problems caused by the single communication mode of the traditional water meter circuit by integrating dual-mode communication technology. The wireless remote transmission module uses Cat.1 technology to provide high-speed data transmission and good mobility, and is connected to the level conversion module through the first communication port to realize the communication protocol and level adaptation with the Bluetooth chip main control module; the level conversion module converts the received signal into a format suitable for the Bluetooth chip main control module and sends it through the second communication port; after the Bluetooth chip main control module processes the signal, it controls the motor drive module to realize precise control of the water meter valve; at the same time, the power control module intelligently manages the power supply to ensure the stable operation of the entire system. The data transmission rate is improved and the communication delay is reduced, the stability and reliability of the communication are enhanced, and the normal communication and control of the water meter can be maintained even in poor signal coverage or mobile environments, meeting the needs of modern smart water meters for efficient communication.

[0042] Preferably, the basic parameters are operating voltage: 2.4~4.5V; static current: 9μA; daily average current: 32μA (typical value); transmission power: 23dBm±2dBm; step-division duplex; operating frequency band: LTE-FDD: Band1 / 3 / 5 / 8; LTE-TDD: Band34 / 38 / 39 / 40 / 41; pulse equivalent: from 0.001m to 100m: configurable by default for 1 day, configurable, minimum 15 minutes; sampling period: default 1 day, configurable, minimum 15 minutes; reporting period: default 1 day, configurable, minimum 5 minutes; reporting duration: 4 seconds (typical value).

[0043] Preferably, Figure 3 , 10 As shown, the model of the wireless remote transmission module is NT26-FCN; the model of the Bluetooth chip main control module is EFR32BG22C112.

[0044] Further, such as Figure 3 As shown, the wireless remote transmission module includes a wireless remote transmission chip UB1, and the wireless remote transmission chip UB1 is a Cat.1 wireless communication module.

[0045] In this embodiment, a low-power valve-controlled water meter control module based on the OpenCPU chip level is integrated with various functions such as touch buttons, valve control, metering sampling, wave crystal display (optional), battery voltage detection and local communication. By adopting LTE Cat.1 wireless remote transmission technology, the signal coverage, communication rate and concurrent performance are significantly improved.

[0046] In summary, as a Cat.1 wireless communication module, the wireless remote transmission chip UB1 provides a high-speed, stable and highly compatible communication capability, allowing valve-controlled water meters to achieve faster remote data transmission and more reliable network connections, thereby significantly improving the remote monitoring, control and data management capabilities of smart water meters.

[0047] Further, such as Figure 4-7 As shown, the level conversion module includes a first level matching unit, a second level matching unit, a first signal isolation unit and a second signal isolation unit. The first communication port of the wireless remote transmission module is connected to the first communication port of the first level matching unit, the second communication port of the first level matching unit is connected to the communication port of the Bluetooth chip main control module, the wake-up signal port of the wireless remote transmission module is connected to the first end of the first signal isolation unit, the second end of the first signal isolation unit is connected to the interrupt trigger port of the Bluetooth chip main control module, the first reset signal port of the wireless remote transmission module is connected to the first end of the second signal isolation unit, the second end of the second signal isolation unit is connected to the general input / output port of the Bluetooth chip main control module, the second reset signal port of the wireless remote transmission module is connected to the first communication port of the second level matching unit, and the second communication port of the second level matching unit is connected to the reset port of the Bluetooth chip main control module.

[0048] In summary, the level conversion module realizes effective level matching and safe signal isolation between the wireless remote transmission module and the Bluetooth chip main control module through the integrated level matching and signal isolation unit. Its technical effect is to enhance the anti-interference ability of the system and ensure the integrity and reliability of the signal. At the same time, through precise level conversion and isolation protection, the stability and communication efficiency of the entire valve-controlled water meter circuit are improved.

[0049] Further, such as Figure 4 As shown, the first level matching unit includes a resistor R49, a resistor R51, a transistor Q6 and a transistor Q10, the first communication port of the wireless remote transmission module includes a narrowband transmission port, a narrowband receiving port, a 4G communication transmission port and a 4G communication receiving port, the communication port of the Bluetooth chip main control module includes an MCU transmission port and an MCU receiving port, the common node between the narrowband transmission port and the 4G communication transmission port is connected to the emitter of the transistor Q6, the collector of the transistor Q6 is connected to the MCU receiving port, the base of the transistor Q6 is connected to the enable control end of the wireless remote transmission module, the resistor R49 is located between the collector of the transistor Q6 and the power output end of the power control module, the MCU transmission port is connected to the emitter of the transistor Q10, the collector of the transistor Q10 is respectively connected to the narrowband receiving port and the 4G communication receiving port, the base of the transistor Q10 is connected to the enable control end of the wireless remote transmission module, and the resistor R51 is located between the collector of the transistor Q10 and the power output end of the power control module.

[0050] In this embodiment, the 4G communication receiving port is the Cat1 RXD2 pin, and the narrowband receiving port is the NB RXD2-2. The Cat1 RXD2 pin or the NB RXD2-2 becomes the MCU LTXD0 after passing through a transistor. This process involves signal conversion and level matching to ensure that the signal of the Cat1 communication module (or NB-IoT module) can be correctly received by the MCU (Bluetooth chip main control module). The following is a detailed explanation of the process: Signal conversion: The signal is transmitted from the Cat1 communication module to the MCU, and the signal level needs to be converted. The Cat1 communication module and the MCU use different voltage levels, which requires a conversion circuit to match their levels. The role of the transistor: The transistor acts as a switch or amplifier here for level conversion. The basic working principle of the transistor is to control the current between the collector and the emitter through the base current. Specifically, in this application, the transistor can be used for level conversion and signal amplification to ensure that the signal has the correct level and sufficient strength when it is transmitted from the Cat1 module to the MCU.

[0051] Base: Connect to Cat1 RXD2 pin (or NB RXD2-2), receive signal.

[0052] Collector: Connects to a pull-up resistor and supply voltage to provide the desired output level.

[0053] Emitter: Connect to LTXD0 pin of MCU.

[0054] Working principle: When the Cat1RXD2 pin (or NBRXD2-2) sends a signal, the signal is applied to the base of the transistor, turning it on. After turning on, the current flows from the collector to the emitter, and the output signal is transmitted to the LTXD0 pin of the MCU. In this way, the signal is converted from the Cat1 module to a level suitable for MCU reception.

[0055] Level matching: The purpose of level conversion is to ensure that the signal levels between the Cat1 module and the MCU match. For example, the Cat1 module outputs a 1.8V signal, while the MCU requires a 3.3V signal. This level conversion ensures that devices with different voltage levels can communicate correctly.

[0056] To sum up, the signal of Cat1 RXD2 pin (or NB RXD2-2 pin) becomes MCULTXD0 after passing through the transistor, which is a typical signal level conversion process. The transistor plays the role of level conversion and signal amplification in this process, ensuring that the signal of Cat1 communication module can be correctly received and processed by MCU (Bluetooth chip main control module), and the same is true for Cat1TXD2 pin (or NB TXD2-2 pin), so I will not go into details here.

[0057] In summary, the level conversion module realizes precise level matching and signal routing between the narrowband and 4G communication ports of the wireless remote transmission module and the MCU port of the Bluetooth chip main control module through carefully designed resistors and transistor circuits. The technical effect is to ensure seamless compatibility and efficient communication between different communication technologies. At the same time, by enabling the linkage of the control end, flexible control of the wireless communication module is achieved, thereby improving the communication efficiency and reliability of the entire valve-controlled water meter circuit.

[0058] Further, such as Figure 5 As shown, the first signal isolation unit includes a diode D11, the wake-up signal port of the wireless remote transmission module is connected to the positive terminal of the diode D11, and the negative terminal of the diode D11 is connected to the interrupt trigger port of the Bluetooth chip main control module.

[0059] In summary, the first signal isolation unit realizes unidirectional signal transmission and electrical isolation between the wake-up signal port of the wireless remote transmission module and the interrupt trigger port of the Bluetooth chip main control module through the diode D11. The technical effect is to enhance the anti-interference ability of the system, ensure the stable transmission of the wake-up signal, and protect the Bluetooth chip from potential reverse current or voltage shocks, thereby improving the stability and safety of the entire valve-controlled water meter circuit.

[0060] Further, such as Figure 6 As shown, the second signal isolation unit includes a diode D9, the first reset signal port of the wireless remote transmission module is connected to the positive terminal of the diode D9, and the negative terminal of the diode D9 is connected to the universal input / output port of the Bluetooth chip main control module.

[0061] In summary, the second signal isolation unit realizes signal isolation and directional transmission between the first reset signal port of the wireless remote transmission module and the general input / output port of the Bluetooth chip main control module through the diode D9. The technical effect is to ensure the correct unidirectional transmission of the reset signal and prevent potential reverse current damage, thereby enhancing the reliability of the system and the protection of the Bluetooth chip.

[0062] In this embodiment, the Cat1_WAK2 pin is the wake-up signal port of the line remote transmission module, the MCU_EINT pin is the interrupt trigger port of the Bluetooth chip main control module, and the CAT_RST pin is the first reset signal port of the line remote transmission module. The Cat1_WAK2 pin passes through a diode to become the MCU_EINT pin and the CAT_RST pin passes through a diode to become the MCU_IO pin. This can be understood as using a diode for simple signal isolation or protection. The following is a detailed explanation: The role of the diode: Directionality: The diode allows current to flow in only one direction, thereby preventing the signal from being transmitted in reverse. This is useful in protecting circuits and avoiding signal interference. Voltage drop: The diode will have a small voltage drop when it is forward-conducted (usually 0.7V for silicon diodes), which can be used for voltage matching in some cases, but the main purpose is signal transmission. Signal isolation: Cat1_WAK2 pin to MCU_EINT pin: The wake-up signal (WAK2) of the Cat1 module passes through a diode to the external interrupt pin (EINT) of the MCU. The diode here mainly plays the role of signal isolation, ensuring that the wake-up signal can be correctly transmitted to the MCU, while preventing the signal on the MCU pin from affecting the Cat1 module. CAT_RST pin to MCU_IO pin: The reset signal (RST) of the Cat1 module passes through the diode to the general input / output pin (IO) of the MCU. Similarly, the diode plays the role of signal isolation and protection, ensuring that the reset signal can be correctly transmitted, while preventing the signal on the MCU side from affecting the Cat1 module. Protection function: Prevent reverse current: The diode prevents the current from flowing into the Cat1 module from the MCU side in reverse, which can protect the pins of the Cat1 module from being affected by the current on the MCU side. Overvoltage protection: In some cases, the diode can also provide overvoltage protection to prevent signals exceeding a certain voltage threshold from being transmitted to the MCU, thereby protecting the MCU pins. Circuit simplification: Using diodes for simple signal transmission and protection can simplify circuit design and reduce costs. The use of diodes does not require complex level conversion circuits, so it is a cost-effective way to achieve reliable signal transmission and protection. Summary: The Cat1_WAK2 pin passes through a diode to become the MCU_EINT pin and the CAT_RST pin passes through a diode to become the MCU_IO pin. This design is mainly for signal isolation and protection. The diode ensures that the signal can only be transmitted in one direction, prevents reverse current, and provides voltage protection to a certain extent, thereby ensuring that the signal between the Cat1 module and the MCU can be transmitted stably and reliably.

[0063] Further, such as Figure 7As shown, the second level matching unit includes a transistor Q9 and a resistor R40, the reset port of the Bluetooth chip main control module is connected to the collector of the transistor Q9, the emitter of the transistor Q9 is connected to the second reset signal port of the wireless remote transmission module, and the resistor R40 is located between the base of the transistor Q9 and the enable control end of the wireless remote transmission module.

[0064] In this embodiment, in electronic circuit design, the reset signal is a common control signal used to reset the state of a microcontroller or other electronic module to the initial state. The CAT RST MCU pin is the second reset signal port of the wireless remote transmission module. Both the "CAT RST pin" and the "CAT RST MCU pin" are related to the reset function, but their connection methods and purposes are different. Here are some reasons and differences: Signal isolation: The diode connection is used to achieve unidirectional signal transmission to prevent reverse current or voltage from affecting the wireless remote transmission module. The transistor can provide more control capabilities, such as controlling the conduction and cutoff of the transistor through the base signal to achieve switch control of the reset signal. Level conversion: Different modules require different voltage levels to identify the reset signal. Using diodes and transistors can perform level conversion to ensure that the signal is correctly identified between different modules. Control logic: "CAT RST" is directly connected to the input / output (IO) pin of the Bluetooth chip to trigger reset under specific conditions. The "CAT RST MCU" is connected to the reset (REST) ​​pin of the MCU through a transistor to implement more complex control logic, such as controlling the reset process by an external signal. Protection mechanism: Diodes can provide reverse voltage protection to prevent reverse voltage shock. The use of transistors involves more complex protection or control mechanisms. Signal characteristics: Diodes have unidirectional conductivity, while transistors can amplify or switch signals. This difference causes the two reset signals to play different roles in the circuit. Inter-module interaction: In a complex system, different modules require different reset strategies. For example, the wireless remote transmission module needs to be reset independently under specific conditions, while the MCU needs to be reset in coordination according to the system status. Fault diagnosis: In some cases, connecting the reset signal through different paths can be used for fault diagnosis or system monitoring, such as detecting the source and path of the reset signal.

[0065] In summary, the second level matching unit realizes the level conversion and signal matching between the second reset signal port of the wireless remote transmission module and the reset port of the Bluetooth chip main control module through the cooperation of the transistor Q9 and the resistor R40. The technical effect is to ensure the correct and stable transmission of the reset signal between modules with different level requirements, and realize the enable control of the transistor base through the resistor R40, thereby improving the signal compatibility of the system and the reliability of the reset operation.

[0066] Further, such as Fig. 9 As shown, the power control module includes a MOS tube M2, a resistor R12, a resistor R13, a boost chip UM1 and a transistor Q5, the source of the MOS tube M2 is connected to the power supply, the drain of the MOS tube M2 serves as a first power output end of the power control module to output a 3.6V voltage for power supply, the drain of the MOS tube M2 is connected to the power input end of the boost chip UM1, the power output end of the boost chip UM1 serves as a second power output end of the power control module to output a 3.8V voltage for power supply, the drain of the MOS tube M2 is connected to a first end of the resistor R13, the second end of the resistor R13 is connected to a first end of the resistor R12, the second end of the resistor R12 is grounded, the common node between the second end of the resistor R13 and the first end of the resistor R12 is connected to a voltage acquisition port of a Bluetooth chip main control module, the voltage adjustment port of the Bluetooth chip main control module is connected to the base of the transistor Q5, the drain of the MOS tube M2 is connected to the collector of the transistor Q5, and the emitter of the transistor Q5 is grounded.

[0067] In this embodiment, the voltage acquisition port of the Bluetooth chip main control module is the V_TEST pin, and the voltage regulation port of the Bluetooth chip main control module is the NB_V_CTL pin, which is connected between the two resistors R13 and R12 of the power control module to monitor the power supply voltage to ensure that the system operates within the specified voltage range. The NB_V_CTL pin receives the voltage feedback signal from the power control module, that is, the voltage acquisition signal of the V_TEST pin, so that the Bluetooth main control module can monitor the power status.

[0068] In summary, the power control module realizes stable output and regulation of the power supply voltage through the cooperation of MOS tube M2, boost chip UM1 and precision resistors R12 and R13. At the same time, the voltage collection and regulation function of the Bluetooth chip main control module is realized through transistor Q5. The technical effect is to ensure the power supply stability and precise control of the voltage level of the entire valve-controlled water meter circuit, thereby improving the power management efficiency of the system and the reliability of the circuit.

[0069] Further, such as Figure 8As shown, the first power output end of the power control module is connected to the DC-DC conversion module, and the DC-DC conversion module includes an inductor L5, an inductor L6, a capacitor C9, a capacitor C10, a capacitor C11 and a capacitor C12. The first power output end of the power control module is connected to the first end of the inductor L5, the capacitor C9 is located between the second end of the inductor L5 and the ground, the capacitor C10 is located between the second end of the inductor L5 and the ground, and the common node between the second end of the inductor L5 and the capacitor C10 serves as the first voltage output end of the DC-DC conversion module. The first power output end of the power control module is connected to the first end of the inductor L6, the capacitor C11 is located between the second end of the inductor L6 and the ground, the capacitor C12 is located between the second end of the inductor L6 and the ground, and the common node between the second end of the inductor L6 and the capacitor C12 serves as the second voltage output end of the DC-DC conversion module.

[0070] In this embodiment, the DC-DC conversion module realizes voltage conversion and stable output through inductors L5 and L6 and matching capacitors C9, C10, C11 and C12. The working principle is: inductors L5 and L6 store and release energy under the input voltage provided by the first power output terminal of the power control module to form a switching current. When the current in the inductor increases, energy is stored in the inductor; when the current decreases, the stored energy is released. Capacitors C9 and C10, C11 and C12 are connected in parallel with inductors L5 and L6 respectively, which play a filtering role, smooth the ripple in the output voltage, and provide a stable DC output. The common node between the second end of the inductor L5 and the capacitor C10, and the common node between the second end of the inductor L6 and the capacitor C12, respectively, serve as the first and second voltage output terminals of the DC-DC conversion module, providing a stable voltage after conversion and filtering for subsequent circuits. By adjusting the switching frequency and duty cycle, the DC-DC conversion module can achieve different input and output voltage requirements and meet the power supply requirements of different parts in the valve-controlled water meter circuit.

[0071] In summary, the DC-DC conversion module integrated in the power control module achieves efficient voltage conversion and stable output through the coordinated work of inductors L5, L6 and capacitors C9, C10, C11, and C12. The technical effect is that two stable voltage output terminals are provided, ensuring that different parts of the circuit can obtain the required precise voltage, thereby enhancing the power supply stability and efficiency of the entire valve-controlled water meter circuit.

[0072] Further, such as Fig.11 As shown, the valve-controlled water meter circuit also includes a SIM card module, and a SIM communication port of the SIM card module is connected to the second communication port of the wireless remote transmission module.

[0073] In this embodiment, the SIM card module integrated in the valve-controlled water meter circuit is connected to the second communication port of the wireless remote transmission module through its SIM communication port, thereby realizing seamless access and data exchange between the water meter and the mobile communication network. This technical configuration allows the water meter to use the existing cellular network for remote communication through the SIM card module to upload and issue data. The working principle is: the SIM card module receives water consumption data from the water meter and sends it to the service provider's server or directly to the user's smartphone application through the wireless remote transmission module. At the same time, the connection can also receive control instructions or configuration updates from the remote system to realize remote monitoring and control of the water meter. This design not only improves the intelligence level of the water meter, but also provides users with a more flexible and convenient way to manage water use, ensuring the reliability of data transmission and the real-time operation of the water meter.

[0074] In summary, the SIM card module integrated in the valve-controlled water meter circuit is connected to the second communication port of the wireless remote transmission module. The technical effect is to realize the direct connection and data transmission between the water meter and the mobile communication network, provide a stable and reliable remote communication means, and enhance the intelligence level of the water meter and the remote monitoring and management capabilities.

[0075] The above are all preferred embodiments of the present application, and the protection scope of the present application is not limited thereto. Therefore, any equivalent changes made according to the structure, shape, and principle of the present application should be included in the protection scope of the present application.

Claims

1. A valve-controlled water meter circuit with dual-mode communication, characterized in that: The valve-controlled water meter circuit includes a power control module connected to a power supply, a wireless remote transmission module, a level conversion module, a Bluetooth chip main control module and a motor drive module. The first communication port of the wireless remote transmission module is connected to the first communication port of the level conversion module, the second communication port of the level conversion module is connected to the communication port of the Bluetooth chip main control module, the signal output end of the Bluetooth chip main control module is connected to the signal input end of the motor drive module, the signal output end of the motor drive module outputs a signal to control the opening or closing of the valve-controlled water meter, and the power output end of the power control module outputs power for power supply.

2. A valve-controlled water meter circuit with dual-mode communication according to claim 1, characterized in that: The wireless remote transmission module includes a wireless remote transmission chip UB1, and the wireless remote transmission chip UB1 is a Cat.1 wireless communication module.

3. A valve-controlled water meter circuit with dual-mode communication according to claim 1, characterized in that: The level conversion module includes a first level matching unit, a second level matching unit, a first signal isolation unit and a second signal isolation unit. The first communication port of the wireless remote transmission module is connected to the first communication port of the first level matching unit, the second communication port of the first level matching unit is connected to the communication port of the Bluetooth chip main control module, the wake-up signal port of the wireless remote transmission module is connected to the first end of the first signal isolation unit, the second end of the first signal isolation unit is connected to the interrupt trigger port of the Bluetooth chip main control module, the first reset signal port of the wireless remote transmission module is connected to the first end of the second signal isolation unit, the second end of the second signal isolation unit is connected to the general input / output port of the Bluetooth chip main control module, the second reset signal port of the wireless remote transmission module is connected to the first communication port of the second level matching unit, and the second communication port of the second level matching unit is connected to the reset port of the Bluetooth chip main control module.

4. A valve-controlled water meter circuit with dual-mode communication according to claim 3, characterized in that: The first level matching unit includes a resistor R49, a resistor R51, a transistor Q6 and a transistor Q10. The first communication port of the wireless remote transmission module includes a narrowband transmission port, a narrowband receiving port, a 4G communication transmission port and a 4G communication receiving port. The communication port of the Bluetooth chip main control module includes an MCU transmission port and an MCU receiving port. The common node between the narrowband transmission port and the 4G communication transmission port is connected to the emitter of the transistor Q6, and the collector of the transistor Q6 is connected to the MCU receiving port. The base of transistor Q6 is connected to the enable control end of the wireless remote transmission module, the resistor R49 is located between the collector of the transistor Q6 and the power output end of the power control module, the MCU sending port is connected to the emitter of the transistor Q10, the collector of the transistor Q10 is respectively connected to the narrowband receiving port and the 4G communication receiving port, the base of the transistor Q10 is connected to the enable control end of the wireless remote transmission module, and the resistor R51 is located between the collector of the transistor Q10 and the power output end of the power control module.

5. A valve-controlled water meter circuit with dual-mode communication according to claim 3, characterized in that: The first signal isolation unit includes a diode D11, the wake-up signal port of the wireless remote transmission module is connected to the positive terminal of the diode D11, and the negative terminal of the diode D11 is connected to the interrupt trigger port of the Bluetooth chip main control module.

6. A valve-controlled water meter circuit with dual-mode communication according to claim 3, characterized in that: The second signal isolation unit includes a diode D9, the first reset signal port of the wireless remote transmission module is connected to the positive terminal of the diode D9, and the negative terminal of the diode D9 is connected to the universal input / output port of the Bluetooth chip main control module.

7. A valve-controlled water meter circuit with dual-mode communication according to claim 3, characterized in that: The second level matching unit includes a transistor Q9 and a resistor R40. The reset port of the Bluetooth chip main control module is connected to the collector of the transistor Q9. The emitter of the transistor Q9 is connected to the second reset signal port of the wireless remote transmission module. The resistor R40 is located between the base of the transistor Q9 and the enable control end of the wireless remote transmission module.

8. The valve-controlled water meter circuit with dual-mode communication according to claim 1, characterized in that: The power control module includes a MOS tube M2, a resistor R12, a resistor R13, a boost chip UM1 and a transistor Q5. The source of the MOS tube M2 is connected to the power supply. The drain of the MOS tube M2 serves as the first power output terminal of the power control module to output a 3.6V voltage for power supply. The drain of the MOS tube M2 is connected to the power input terminal of the boost chip UM1. The power output terminal of the boost chip UM1 serves as the second power output terminal of the power control module to output a 3.8V voltage for power supply. The drain of the MOS tube M2 is connected to the first end of the resistor R13, the second end of the resistor R13 is connected to the first end of the resistor R12, the second end of the resistor R12 is grounded, the common node between the second end of the resistor R13 and the first end of the resistor R12 is connected to the voltage acquisition port of the Bluetooth chip main control module, the voltage adjustment port of the Bluetooth chip main control module is connected to the base of the transistor Q5, the drain of the MOS tube M2 is connected to the collector of the transistor Q5, and the emitter of the transistor Q5 is grounded.

9. A valve-controlled water meter circuit with dual-mode communication according to claim 8, characterized in that: The first power output end of the power control module is connected to a DC-DC conversion module, and the DC-DC conversion module includes an inductor L5, an inductor L6, a capacitor C9, a capacitor C10, a capacitor C11 and a capacitor C12. The first power output end of the power control module is connected to the first end of the inductor L5, the capacitor C9 is located between the second end of the inductor L5 and the ground, the capacitor C10 is located between the second end of the inductor L5 and the ground, and a common node between the second end of the inductor L5 and the capacitor C10 serves as a first voltage output end of the DC-DC conversion module. The first power output end of the power control module is connected to the first end of the inductor L6, the capacitor C11 is located between the second end of the inductor L6 and the ground, the capacitor C12 is located between the second end of the inductor L6 and the ground, and a common node between the second end of the inductor L6 and the capacitor C12 serves as a second voltage output end of the DC-DC conversion module.

10. The valve-controlled water meter circuit with dual-mode communication according to claim 1, characterized in that: The valve-controlled water meter circuit also includes a SIM card module, and a SIM communication port of the SIM card module is connected to the second communication port of the wireless remote transmission module.

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