Underground low-voltage power supply and carrier communication system and communication method

Abstract

The invention discloses an underground low-voltage power supply and carrier communication system and a communication method, relates to the technical field of carrier communication, and aims to solve the problem that in the underground oil extraction and water injection process, the ground not only needs to supply power to an underground measurement and control device, but also needs to communicate with the underground measurement and control device in a two-way manner; and the traditional cable power supply and communication system and communication method cannot meet the actual requirements. The system comprises a power supply circuit unit and a power receiving circuit unit. The power supply circuit unit comprises a main controller, a power supply, a relay module, a signal receiving module and the like, the power receiving circuit unit comprises a circuit unit 1, a circuit unit 2 and a circuit unit 3, and the circuit units 1-3 are respectively composed of a slave controller module, a storage battery module, a carrier signal sending module, a carrier signal receiving module, a measurement and control module and the like. The system adopts a direct-current power supply and communication mode of one master and multiple slaves, so that underground power supply and communication equipment of an oil field is simplified, the operation efficiency is improved, and the operation and maintenance cost is reduced.

Description

Technical Field

[0001] The present invention relates to the field of electronic circuits and communication technology, and in particular to an underground low-voltage power supply and carrier communication system and a communication method. Background Art

[0002] With the rapid development of social economy, power line carrier communication has been widely used in power systems due to its advantages of long communication distance, low cost, and high signal transmission reliability. Power line carrier communication includes AC power carrier communication and DC power carrier communication. In AC power carrier communication, modulation and transmission are achieved by modulating the fundamental signal into carrier signals of different formats at the moment of AC zero crossing, and demodulation is also achieved by receiving the carrier signal through the receiving circuit at the zero crossing and then decoding. In DC power carrier communication, the signal attenuation is relatively small, the transmission distance is longer than that of AC power carrier communication, and the signal on the DC power line is less interfered, especially in pure DC systems without AC fluctuations, the signal stability is higher. Therefore, compared with other communication methods, such as wireless communication or dedicated wired communication, DC power carrier communication has significant advantages in wiring and maintenance costs.

[0003] In the process of cable-based stratified oil production and water injection in oil fields, the underground measurement and control instruments not only need cable power supply, but also need to communicate with the ground in two directions to control the motor equipment at each layer of the underground well and collect production data (such as temperature, pressure, and flow). The traditional wired communication method requires fixing 1-2 communication lines and power lines on the outside of the lifting string. In practical applications, there are problems such as complex installation, high construction cost, and difficult maintenance. In the wave code-based cable-free stratified oil production and water injection technology, the ground and the underground use the wave code form for two-way communication, and there is no need to fix cables on the outside of the lifting string. However, there is a problem of low communication efficiency. It often takes dozens of minutes to complete a communication, and it is impossible to monitor in real time whether the working voltage, current, battery power and other working status parameters of the measurement and control instruments at each layer of the underground well are normal. In addition, the conventional wave code-based cable-free intelligent distributor cannot replenish power after the battery of the instrument is exhausted, and cannot be reused. In addition, each production well and water injection well in the existing oil field has a set of independent DC power carrier communication systems, which have serious data islands and cannot achieve intelligent measurement and control.

[0004] Based on the industry technology development trend and the above-mentioned problems, the present invention designs a real-time data transmission system for underground low-voltage power supply and DC carrier two-way communication, and designs corresponding two-way transceiver circuits and a communication method suitable for transmission in underground DC cables. While reducing the transmission bit error rate, it can also realize centralized measurement and control of multiple production wells or water injection wells by a single ground control cabinet, laying a foundation for the intelligent upgrade of oil field cable stratified oil production and water injection technology. Summary of the invention

[0005] Based on the existing cabled stratified oil production and water injection technology in oil fields, the technical problem to be solved by the present invention is to provide a new underground stratified measurement and control wired communication system and communication method, which can not only greatly reduce the two-way transmission bit error rate of the system, but also break the data island on site and realize the centralized measurement and control of multiple oil wells in a large range of oil fields. In addition, the present invention also helps to improve the production efficiency of oil fields and provide data support for the intelligent upgrade of oil fields.

[0006] The present invention specifically adopts the following technical solutions to solve the above technical problems:

[0007] The underground low-voltage power supply and carrier communication system is characterized in that the system mainly includes a power supply circuit unit and a power receiving circuit unit; the power supply circuit unit mainly includes a main controller MCU1, a power supply VCC-1, a relay module RL1, a relay module RL2, a relay module RL3, a signal receiving module 1, a signal receiving module 2, and a signal receiving module 3; the power receiving circuit unit mainly includes a circuit unit 1, a circuit unit 2, and a circuit unit 3, and the three circuit units are respectively composed of a slave controller module, a battery module, a carrier signal sending module, a carrier signal receiving module, and a measurement and control module.

[0008] Furthermore, one end of the controlled-end power line of the relay module RL1, the relay module RL2, and the relay module RL3 is respectively connected to the power line of the circuit unit 1, the circuit unit 2, and the circuit unit 3, and the other end of the controlled-end power line is electrically connected to the power supply VCC-1; the control end MCU1-TXD(01) is connected to the signal sending end TXD(01) of the main controller MCU1, the control end MCU1-TXD(02) is connected to the signal sending end TXD(02) of the main controller MCU1, and the control end MCU1-TXD(03) is connected to the signal sending end TXD(03) of the main controller MCU1.

[0009] Furthermore, the signal receiving module 1, the signal receiving module 2 and the signal receiving module 3 are respectively connected in parallel to the power lines connected to the relay module RL1, the relay module RL2 and the relay module RL3; the battery module is respectively electrically connected to the slave controller module and the measurement and control module, and the slave controller module is signal-connected to the measurement and control module; the carrier signal sending module is connected to both ends of the transistors in the circuit unit 1, the circuit unit 2 and the circuit unit 3, and the carrier signal receiving module is connected in parallel to the power lines in the circuit unit 1, the circuit unit 2 and the circuit unit 3.

[0010] Furthermore, the MCU1_TXD(01) port of the relay module RL1 is connected to the base of the transistor Q1, the emitter of the transistor Q1 is grounded, the collector of the transistor Q1 is connected to the output terminal of the relay control end, and the input terminal of the relay control end is connected to the power supply VDD-1 of the main controller MCU1; one input terminal of the relay controlled end is grounded, and the other input terminal is connected to the power supply VCC-1 through the voltage dividing resistor R3, and the output terminal of the relay controlled end is connected to the circuit unit 1, which is used to provide power to a certain downhole measurement and control equipment and realize DC carrier communication.

[0011] Furthermore, the MCU1_TXD(02) port of the relay module RL2 is connected to the base of the transistor Q3, the emitter of the transistor Q3 is grounded, the collector of the transistor Q3 is connected to the output terminal of the relay control end, and the input terminal of the relay control end is connected to the power supply VDD-1 of the main controller MCU1; one input terminal of the relay controlled end is grounded, and the other input terminal is connected to the power supply VCC-1 through the voltage dividing resistor R12, and the output terminal of the relay controlled end is connected to the circuit unit 2; it is used to provide power to another downhole measurement and control equipment and realize DC carrier communication.

[0012] Furthermore, the MCU1_TXD(03) port of the relay module RL3 is connected to the base of the transistor Q5, the emitter of the transistor Q5 is grounded, the collector of the transistor Q5 is connected to the output terminal of the relay control end, and the input terminal of the relay control end is connected to the power supply VDD-1 of the main controller MCU1; one input terminal of the relay controlled end is grounded, and the other input terminal is connected to the power supply VCC-1 through the voltage dividing resistor R22, and the output terminal of the relay controlled end is connected to the circuit unit 3; it is used to provide power to other downhole measurement and control equipment and realize DC carrier communication.

[0013] Furthermore, the signal receiving module 1 is composed of an optical coupler U1, a signal receiving port MCU1-RXD (01) and an auxiliary circuit; the signal receiving port MCU1-RXD (01) is connected to the signal receiving terminal RXD (01) of the main controller MCU1; the primary side of the optical coupler U1 is connected in parallel to the two ends of the voltage divider resistor R3, and is respectively connected to the relay module RL1 and the power supply VCC-1 through the power line; the secondary side of the optical coupler U1, one end is connected to the power supply VDD-1 of the main controller through the resistor R2, and the other end is connected to the signal receiving port MCU1-RXD (01).

[0014] Furthermore, the signal receiving module 2 is composed of an optical coupler U4, a signal receiving port MCU1-RXD (02) and an auxiliary circuit; the signal receiving port MCU1-RXD (02) is connected to the signal receiving terminal RXD (02) of the main controller MCU1; the primary side of the optical coupler U4 is connected in parallel to the two ends of the voltage divider resistor R12, and is respectively connected to the relay module RL2 and the power supply VCC-1 through the power line; the secondary side of the optical coupler U4, one end is connected to the power supply VDD-1 of the main controller through the resistor R11, and the other end is connected to the signal receiving port MCU1-RXD (02).

[0015] Furthermore, the signal receiving module 3 is composed of an optical coupler U7, a signal receiving port MCU1-RXD (03) and an auxiliary circuit; the signal receiving port MCU1-RXD (03) is connected to the signal receiving terminal RXD (03) of the main controller MCU1; the primary side of the optical coupler U7 is connected in parallel to the two ends of the voltage divider resistor R22, and is respectively connected to the relay module RL3 and the power supply VCC-1 through the power line; the secondary side of the optical coupler U7, one end is connected to the power supply VDD-1 of the main controller through the resistor R21, and the other end is connected to the signal receiving port MCU1-RXD (03).

[0016] Furthermore, the outgoing end of the power line connected to the relay module RL1 is connected to the receiving end of the power line in the circuit unit 1; the receiving end power line in the circuit unit 1 is connected to the emitter of the transistor Q2, the collector of the transistor Q2 is connected to the voltage-dividing resistor R9 through the power line, the secondary side of the optical coupler U2 in the carrier signal sending module is respectively connected to the base and emitter of the transistor Q2, one end of the primary side of the optical coupler U2 is connected to the power supply VDD-2 of the slave controller module MCU2, and the other end MCU2-TXD is connected to the signal sending end TXD of the slave controller module MCU2; the primary side of the optical coupler U3 in the carrier signal receiving module is connected in parallel to the two ends of the voltage-dividing resistor R9 in the circuit unit 1, and the output end of the primary side of the optical coupler U3 is connected to the battery module through the power line, one end of the secondary side of the optical coupler U3 is connected to the power supply VDD-2 of the slave controller module MCU2, and the other end MCU2-RXD is connected to the signal receiving port RXD of the slave controller module MCU2; the measurement and control module includes temperature, pressure, flow sensors and servo motors, etc.

[0017] Furthermore, the outgoing end of the power line connected to the relay module RL2 is connected to the receiving end of the power line in the circuit unit 2; the receiving end power line in the circuit unit 2 is connected to the emitter of the transistor Q4, the collector of the transistor Q4 is connected to the voltage-dividing resistor R17 through the power line, the secondary side of the optical coupler U5 in the carrier signal sending module is respectively connected to the base and emitter of the transistor Q4, one end of the primary side of the optical coupler U5 is connected to the power supply VDD-3 of the slave controller module MCU3, and the other end MCU3-TXD is connected to the signal sending end TXD of the slave controller module MCU3; the primary side of the optical coupler U6 in the carrier signal receiving module is connected in parallel to the two ends of the voltage-dividing resistor R17 in the circuit unit 2, and the output end of the primary side of the optical coupler U6 is connected to the battery module through the power line, one end of the secondary side of the optical coupler U6 is connected to the power supply VDD-3 of the slave controller module MCU3, and the other end MCU3-RXD is connected to the signal receiving port RXD of the slave controller module MCU3; the measurement and control module includes temperature, pressure, flow sensors and servo motors, etc.

[0018] Furthermore, the outgoing end of the power line connected to the relay module RL3 is connected to the receiving end of the power line in the circuit unit 3; the receiving end power line in the circuit unit 3 is connected to the emitter of the transistor Q6, the collector of the transistor Q6 is connected to the voltage-dividing resistor R27 through the power line, the secondary side of the optical coupler U8 in the carrier signal sending module is respectively connected to the base and emitter of the transistor Q6, one end of the primary side of the optical coupler U8 is connected to the power supply VDD-4 of the slave controller module MCU4, and the other end MCU4-TXD is connected to the signal sending end TXD of the slave controller module MCU4; the primary side of the optical coupler U9 in the carrier signal receiving module is connected in parallel to the two ends of the voltage-dividing resistor R27 in the circuit unit 3, and the output end of the primary side of the optical coupler U9 is connected to the battery module through the power line, one end of the secondary side of the optical coupler U9 is connected to the power supply VDD-4 of the slave controller module MCU4, and the other end MCU4-RXD is connected to the signal receiving port RXD of the slave controller module MCU4; the measurement and control module includes temperature, pressure, flow sensors and servo motors.

[0019] Furthermore, the default state of the signal sending terminals TXD(01), TXD(02) and TXD(03) of the main controller MCU1 is a low level, and the default state of the signal sending terminal of the carrier signal sending module in the power receiving circuit unit is a high level.

[0020] Furthermore, the communication method of the underground low-voltage power supply and carrier communication system includes the following steps:

[0021] Step 1, when the main controller reads the measurement and control data in a certain circuit unit, the main controller sets the signal sending end connected to the corresponding circuit unit to a high level, so that the controlled end of the connected relay module is closed, and the power line in the circuit unit connected to the controlled end is energized and the battery module is charged;

[0022] Step 2, after the power line is powered on, the main controller sends a data packet containing "0" and "1" to the signal sending end; if "1" is sent, the optical coupler of the carrier signal receiving module in the circuit unit works, and the signal receiving end of the slave controller module receives a high level sent by the main controller; if "0" is sent, the signal sending end is set to a low level, so that the controlled end of the connected relay module is disconnected, and the circuit unit connected to the controlled end is powered off, so that the optical coupler of the carrier signal receiving module in the connected circuit unit does not work, and the signal receiving end of the slave controller module receives a low level sent by the main controller; repeat the "0" or "1" sending process until the "0" and "1" in the data packet are sent, and the signal sending end of the main controller maintains a high level state;

[0023] Step 3, when the slave controller module parses the data packet and sends a response signal, the slave controller module sends a data packet containing "0" and "1" to the signal port of the connected carrier signal sending module; if "1" is sent, the signal port of the carrier signal sending module is set to a high level, so that the power line on the corresponding circuit unit is energized, and after energization, the optical coupler of the signal receiving module connected in parallel to the power line works, and the signal receiving end of the main controller receives the high level sent by the slave controller module; if "0" is sent, the signal port of the carrier signal sending module is set to a low level, so that the triode on the power line connected to the carrier signal sending module is turned off, and then no current flows through the controlled end of the relay module connected to the circuit unit, so that the signal receiving end of the signal receiving module connected in parallel to the power line is set to a low level, and the main controller receives the low level sent by the slave controller module; repeat the "0" or "1" sending process until the "0" and "1" in the data packet are sent;

[0024] Step 4: the signal sending end of the carrier signal sending module and the signal sending end of the main controller are restored to a default state; the main controller parses the data packet to obtain the measurement and control data in the circuit unit;

[0025] Step 5: By repeating steps 1-4, the main controller obtains the measurement and control data in any circuit unit.

[0026] The underground low-voltage power supply and carrier communication system and communication method provided by the present invention adopt a one-master-multiple-slave low-voltage DC carrier circuit design, which can not only realize low-voltage DC power supply but also realize communication function through the underground power line, thereby solving the current underground DC carrier communication has high requirements for power supply and relatively stable working voltage. The problem, at the same time, realizes the centralized measurement and control of multiple production wells or water injection wells by a single control cabinet on the ground. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 This is a structural diagram of the underground low-voltage power supply and carrier communication system.

[0028] Figure 2 Flow chart for communication between underground low-voltage power supply and carrier communication system. DETAILED DESCRIPTION

[0029] In order to make the purpose, technical scheme and advantages of the present invention clearer, the technical scheme of the present invention is clearly and completely described below in combination with the drawings and specific implementation methods in the embodiments. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0030] like Figure 1 The underground low-voltage power supply and carrier communication system shown includes a power supply circuit unit and a power receiving circuit unit;

[0031] The power supply circuit unit mainly includes the main controller MCU1, the power supply VCC-1, the relay module RL1, the relay module RL2, the relay module RL3, the signal receiving module 1, the signal receiving module 2, and the signal receiving module 3. In addition, the power supply circuit unit also includes resistors R3, R12, and R22.

[0032] The power receiving circuit unit mainly includes circuit unit 1, circuit unit 2 and circuit unit 3. The three circuit units are respectively composed of a slave controller module, a battery module Battery, a carrier signal sending module, a carrier signal receiving module, a measurement and control module, etc.

[0033] The relay module RL1 includes a relay J1, a transistor Q1, a resistor R4, a capacitor C2, and a diode D1; the relay module RL2 includes a relay J2, a transistor Q3, a resistor R13, a capacitor C6, and a diode D3; the relay module RL3 includes a relay J3, a transistor Q5, a resistor R23, a capacitor C10, and a diode D5;

[0034] The signal receiving module 1 includes a capacitor C1, a resistor R1, a resistor R2, and an optical coupler U1; the signal receiving module 2 includes a capacitor C5, a resistor R10, a resistor R11, and an optical coupler U4; the signal receiving module 3 includes a capacitor C9, a resistor R20, a resistor R21, and an optical coupler U7;

[0035] The carrier signal sending module in the circuit unit 1 includes an optical coupler U2, a resistor R5, and a resistor R6; the carrier signal receiving module in the circuit unit 1 includes an optical coupler U3, a resistor R7, and a capacitor C3; in addition, the circuit unit 1 also includes a transistor Q2 and a resistor R9.

[0036] The carrier signal sending module in the circuit unit 2 includes an optical coupler U5, a resistor R14, and a resistor R15; the carrier signal receiving module in the circuit unit 2 includes an optical coupler U6, a resistor R16, and a capacitor C7; in addition, the circuit unit 2 also includes a transistor Q4 and a resistor R17.

[0037] The carrier signal sending module in the circuit unit 3 includes an optical coupler U8, a resistor R24, and a resistor R25; the carrier signal receiving module in the circuit unit 3 includes an optical coupler U9, a resistor R26, and a capacitor C11; in addition, the circuit unit 3 also includes a transistor Q6 and a resistor R27.

[0038] One end of the controlled-end power line of the relay module RL1, the relay module RL2, and the relay module RL3 is connected to the power line of the circuit unit 1, the circuit unit 2, and the circuit unit 3 respectively, and the other end of the controlled-end power line is electrically connected to the power supply VCC-1; the control end MCU1-TXD(01) is connected to the signal sending end TXD(01) of the main controller MCU1, the control end MCU1-TXD(02) is connected to the signal sending end TXD(02) of the main controller MCU1, and the control end MCU1-TXD(03) is connected to the signal sending end TXD(03) of the main controller MCU1.

[0039] The signal receiving module 1, the signal receiving module 2 and the signal receiving module 3 are respectively connected in parallel to the power lines connected to the relay module RL1, the relay module RL2 and the relay module RL3; the battery module is respectively electrically connected to the slave controller module and the measurement and control module, and the slave controller module is signal-connected to the measurement and control module; the carrier signal sending module is connected to both ends of the transistors in the circuit unit 1, the circuit unit 2 and the circuit unit 3, and the carrier signal receiving module is connected in parallel to the power lines in the circuit unit 1, the circuit unit 2 and the circuit unit 3.

[0040] The MCU1_TXD(01) port of the relay module RL1 is connected to the base of the transistor Q1, the emitter of the transistor Q1 is grounded, the collector of the transistor Q1 is connected to the output terminal of the relay control end, and the input terminal of the relay control end is connected to the power supply VDD-1 of the main controller MCU1; one input terminal of the relay controlled end is grounded, and the other input terminal is connected to the power supply VCC-1 through the voltage dividing resistor R3, and the output terminal of the relay controlled end is connected to the circuit unit 1, which is used to provide power to a certain underground measurement and control equipment and realize DC carrier communication.

[0041] The MCU1_TXD(02) port of the relay module RL2 is connected to the base of the transistor Q3, the emitter of the transistor Q3 is grounded, the collector of the transistor Q3 is connected to the output terminal of the relay control end, and the input terminal of the relay control end is connected to the power supply VDD-1 of the main controller MCU1; one input terminal of the relay controlled end is grounded, and the other input terminal is connected to the power supply VCC-1 through the voltage dividing resistor R12, and the output terminal of the relay controlled end is connected to the circuit unit 2; it is used to provide power to another downhole measurement and control equipment and realize DC carrier communication.

[0042] The MCU1_TXD(03) port of the relay module RL3 is connected to the base of the transistor Q5, the emitter of the transistor Q5 is grounded, the collector of the transistor Q5 is connected to the output terminal of the relay control end, and the input terminal of the relay control end is connected to the power supply VDD-1 of the main controller MCU1; one input terminal of the relay controlled end is grounded, and the other input terminal is connected to the power supply VCC-1 through the voltage dividing resistor R22, and the output terminal of the relay controlled end is connected to the circuit unit 3; it is used to provide power to other downhole measurement and control equipment and realize DC carrier communication.

[0043] The signal receiving module 1 is composed of an optical coupler U1, a signal receiving port MCU1-RXD (01) and an auxiliary circuit; the signal receiving port MCU1-RXD (01) is connected to the signal receiving terminal RXD (01) of the main controller MCU1; the primary side of the optical coupler U1 is connected in parallel to the two ends of the voltage divider resistor R3, and is respectively connected to the relay module RL1 and the power supply VCC-1 through a power line; the secondary side of the optical coupler U1, one end is connected to the power supply VDD-1 of the main controller through a resistor R2, and the other end is connected to the signal receiving port MCU1-RXD (01).

[0044] The signal receiving module 2 is composed of an optical coupler U4, a signal receiving port MCU1-RXD (02) and an auxiliary circuit; the signal receiving port MCU1-RXD (02) is connected to the signal receiving terminal RXD (02) of the main controller MCU1; the primary side of the optical coupler U4 is connected in parallel to the two ends of the voltage divider resistor R12, and is respectively connected to the relay module RL2 and the power supply VCC-1 through the power line; the secondary side of the optical coupler U4, one end is connected to the power supply VDD-1 of the main controller through the resistor R11, and the other end is connected to the signal receiving port MCU1-RXD (02).

[0045] The signal receiving module 3 is composed of an optical coupler U7, a signal receiving port MCU1-RXD (03) and an auxiliary circuit; the signal receiving port MCU1-RXD (03) is connected to the signal receiving terminal RXD (03) of the main controller MCU1; the primary side of the optical coupler U7 is connected in parallel to the two ends of the voltage divider resistor R22, and is respectively connected to the relay module RL3 and the power supply VCC-1 through the power line; the secondary side of the optical coupler U7, one end is connected to the power supply VDD-1 of the main controller through the resistor R21, and the other end is connected to the signal receiving port MCU1-RXD (03).

[0046] The outgoing end of the power line connected to the relay module RL1 is connected to the receiving end of the power line in the circuit unit 1; the receiving end power line in the circuit unit 1 is connected to the emitter of the transistor Q2, and the collector of the transistor Q2 is connected to the voltage-dividing resistor R9 through the power line. The secondary side of the optical coupler U2 in the carrier signal sending module is respectively connected to the base and emitter of the transistor Q2, one end of the primary side of the optical coupler U2 is connected to the power supply VDD-2 of the slave controller module MCU2, and the other end MCU2-TXD is connected to the signal sending end TXD of the slave controller module MCU2; the primary side of the optical coupler U3 in the carrier signal receiving module is connected in parallel to the two ends of the voltage-dividing resistor R9 in the circuit unit 1, and the output end of the primary side of the optical coupler U3 is connected to the battery module through the power line, one end of the secondary side of the optical coupler U3 is connected to the power supply VDD-2 of the slave controller module MCU2, and the other end MCU2-RXD is connected to the signal receiving port RXD of the slave controller module MCU2; the measurement and control module includes temperature, pressure, flow sensors and servo motors.

[0047] The outgoing end of the power line connected to the relay module RL2 is connected to the receiving end of the power line in the circuit unit 2; the receiving end power line in the circuit unit 2 is connected to the emitter of the transistor Q4, and the collector of the transistor Q4 is connected to the voltage-dividing resistor R17 through the power line. The secondary side of the optical coupler U5 in the carrier signal sending module is respectively connected to the base and emitter of the transistor Q4, one end of the primary side of the optical coupler U5 is connected to the power supply VDD-3 of the slave controller module MCU3, and the other end MCU3-TXD is connected to the signal sending end TXD of the slave controller module MCU3; the primary side of the optical coupler U6 in the carrier signal receiving module is connected in parallel to the two ends of the voltage-dividing resistor R17 in the circuit unit 2, and the output end of the primary side of the optical coupler U6 is connected to the battery module through the power line, one end of the secondary side of the optical coupler U6 is connected to the power supply VDD-3 of the slave controller module MCU3, and the other end MCU3-RXD is connected to the signal receiving port RXD of the slave controller module MCU3; the measurement and control module includes temperature, pressure, flow sensors and servo motors.

[0048] The outgoing end of the power line connected to the relay module RL3 is connected to the receiving end of the power line in the circuit unit 3; the receiving end power line in the circuit unit 3 is connected to the emitter of the transistor Q6, and the collector of the transistor Q6 is connected to the voltage-dividing resistor R27 through the power line. The secondary side of the optical coupler U8 in the carrier signal sending module is respectively connected to the base and emitter of the transistor Q6, one end of the primary side of the optical coupler U8 is connected to the power supply VDD-4 of the slave controller module MCU4, and the other end MCU4-TXD is connected to the signal sending end TXD of the slave controller module MCU4; the primary side of the optical coupler U9 in the carrier signal receiving module is connected in parallel to the two ends of the voltage-dividing resistor R27 in the circuit unit 3, and the output end of the primary side of the optical coupler U9 is connected to the battery module through the power line, one end of the secondary side of the optical coupler U9 is connected to the power supply VDD-4 of the slave controller module MCU4, and the other end MCU4-RXD is connected to the signal receiving port RXD of the slave controller module MCU4; the measurement and control module includes temperature, pressure, flow sensors and servo motors.

[0049] For ease of understanding, the initial state and ports of the system are described in detail below:

[0050] The default state of the signal sending terminals TXD(01), TXD(02) and TXD(03) of the main controller MCU1 is low level, and the default state of the signal sending terminal of the carrier signal sending module in the power receiving circuit unit is high level.

[0051] The base of the transistor Q1 is also grounded through a diode D1 and a capacitor C2 connected in parallel, and is also connected to an incoming line of a relay control terminal in the relay module RL1 through a resistor R4.

[0052] The base of the transistor Q3 is also grounded through a diode D3 and a capacitor C6 connected in parallel, and is also connected to an incoming line of a relay control terminal in the relay module RL2 through a resistor R13.

[0053] The base of the transistor Q5 is also grounded through a diode D5 and a capacitor C10 connected in parallel, and is also connected to the incoming line of the relay control terminal in the relay module RL3 through a resistor R23.

[0054] The output end of the secondary side of the optical coupler U1 is also grounded via a resistor R1 and a capacitor C1 connected in parallel.

[0055] The output end of the secondary side of the optical coupler U4 is also grounded via a resistor R10 and a capacitor C5 connected in parallel.

[0056] The output end of the secondary side of the optical coupler U7 is also grounded via a resistor R20 and a capacitor C9 connected in parallel.

[0057] The base of the transistor Q2 is also grounded through a resistor R5, the base of the transistor Q4 is also grounded through a resistor R14, and the base of the transistor Q6 is also grounded through a resistor R24.

[0058] The secondary side of the optical coupler U3 is also grounded via a resistor R7 and a capacitor C3 connected in parallel.

[0059] The secondary side of the optical coupler U6 is also grounded via a resistor R16 and a capacitor C7 connected in parallel.

[0060] The secondary side of the optical coupler U9 is also grounded via a resistor R26 and a capacitor C11 connected in parallel.

[0061] The circuit unit 1 further includes a capacitor C4 and a diode D2; the circuit unit 2 further includes a capacitor C8 and a diode D4; and the circuit unit 3 further includes a capacitor C12 and a diode D6.

[0062] The power supply VDD-1 provides power to the main controller MCU1, the control end of the relay J1, the control end of the relay J2, the control end of the relay J3, the secondary side of the optical coupler U1, the secondary side of the optical coupler U4, and the secondary side of the optical coupler U7;

[0063] The power supply VDD-2 provides power to the slave controller module, the primary side of the optocoupler U2, and the secondary side of the optocoupler U3 of the circuit unit 1;

[0064] The power supply VDD-3 provides power to the slave controller module, the primary side of the optical coupler U5, and the secondary side of the optical coupler U6 of the circuit unit 2;

[0065] The power supply VDD-4 provides power to the slave controller module, the primary side of the optical coupler U8, and the secondary side of the optical coupler U9 of the circuit unit 3;

[0066] For easier understanding, the system's low-voltage power supply and carrier communication process are described in detail below:

[0067] The power supply process of the system is as follows:

[0068] When the power supply circuit unit on the ground charges a certain underground battery module, its main controller MCU1 sets the corresponding signal sending end pin to a high level. For example, when the power supply circuit unit supplies power to the circuit unit 1 in the power receiving circuit unit, the signal sending end TXD (01) pin of the main controller MCU1 is set to a high level, and the control end MCU1-TXD (01) connected to the TXD (01) pin inputs a high level. At this time, the emitter (E pole) and base (B pole) of the transistor Q1 in the relay module RL1 form a bias voltage, Q1 is turned on, the control end of the relay J1 is energized, the contact is closed, the controlled end is turned on, and the power supply VCC-1 supplies power to the power receiving circuit unit through the power line; at this time, the emitter (E pole) and base (B pole) of the transistor Q2 have a bias voltage, Q2 is turned on, and the power supply VCC-1 charges the battery module Battery through the power line.

[0069] The system's carrier communication method is as follows:

[0070] Step 1, when the main controller MCU1 reads the measurement and control data in a certain circuit unit, the main controller MCU1 sets the signal sending end connected to the corresponding circuit unit to a high level, so that the controlled end of the connected relay module is closed, and the power line in the circuit unit connected to the controlled end is energized and the battery module is charged;

[0071] Step 2, after the power line is powered on, the main controller MCU1 sends a data packet containing "0" and "1" to the signal sending end; if "1" is sent, the optical coupler of the carrier signal receiving module in the circuit unit works, and the signal receiving end of the slave controller module receives a high level sent by the main controller MCU1; if "0" is sent, the signal sending end is set to a low level, so that the controlled end of the connected relay module is disconnected, and the circuit unit connected to the controlled end is powered off, so that the optical coupler of the carrier signal receiving module in the connected circuit unit does not work, and the signal receiving end of the slave controller module receives a low level sent by the main controller MCU1; repeat the "0" or "1" sending process until the "0" and "1" in the data packet are sent, and the signal sending end of the main controller MCU1 maintains a high level state;

[0072] Step 3, when the slave controller module parses the data packet and sends a response signal, the slave controller module sends a data packet containing "0" and "1" to the signal port of the connected carrier signal sending module; if "1" is sent, the signal port of the carrier signal sending module is set to a high level, so that the power line on the corresponding circuit unit is energized, and the optical coupler of the signal receiving module connected in parallel to the power line works after energization, and the signal receiving end of the main controller MCU1 receives the high level sent from the slave controller module; if "0" is sent, the signal port of the carrier signal sending module is set to a low level, so that the triode on the power line connected to the carrier signal sending module is turned off, and then no current flows through the controlled end of the relay module connected to the circuit unit, so that the signal receiving end of the signal receiving module connected in parallel to the power line is set to a low level, and the main controller MCU1 receives the low level sent from the slave controller module; repeat the "0" or "1" sending process until the "0" and "1" in the data packet are sent;

[0073] Step 4: The signal sending end of the carrier signal sending module and the signal sending end of the main controller MCU1 are restored to the default state; the main controller MCU1 parses the data packet to obtain the measurement and control data in the circuit unit;

[0074] Step 5: By repeating steps 1-4, the main controller MCU1 obtains the measurement and control data in any circuit unit.

[0075] like Figure 2 The communication implementation flow chart of the underground low-voltage power supply and carrier communication system shown in the figure, this embodiment takes the main controller MCU1 reading the measurement and control data in the circuit unit 1 as an example to describe the communication implementation process in detail:

[0076] (1) The system starts the power supply process of circuit unit 1, and the battery in circuit unit 1 is charged;

[0077] (2) After the power line is powered on, the main controller MCU1 sends a data packet containing "0" and "1" to the signal sending end TXD (01);

[0078] (3) If the data "1" is sent, the signal transmitting end TXD (01) pin is set to a high level, and the MCU1_TXD (01) port of the relay module RL1 connected to TXD (01) is set to a high level, the emitter (E) and base (B) of the transistor Q1 form a bias voltage, the emitter (E) and collector (C) of the transistor Q1 are turned on, the control end of the relay J1 is energized, the controlled end is closed, and the power supply VCC-1 supplies power to the receiving circuit unit through the power line; at this time, the optocoupler If the voltages at both ends of the primary side of U2 are equal, the secondary side of the optocoupler U2 is not conducting, there is a bias voltage between the emitter (E pole) and base (B pole) of the transistor Q2, and the emitter (E pole) and collector (C pole) of the transistor Q2 are conducting; at this time, a voltage difference appears at both ends of the primary side of the optocoupler U3, and the secondary side of the optocoupler U3 is conducting, and the MCU2-RXD port connected to the secondary side of the optocoupler U3 receives a high-level signal, and the signal receiving end RXD of the slave controller module MCU2 receives the high level sent by the main controller, that is, data "1".

[0079] (4) If the data "0" is sent, the signal transmitting end TXD (01) pin is set to a low level, and the MCU1_TXD (01) port of the relay module RL1 connected to TXD (01) is set to a low level, the emitter (E pole) and base (B pole) bias voltages of the transistor Q1 disappear, and the emitter (E pole) and collector (C pole) ends of Q1 are not conducting. After the control end of the relay J1 loses power, the controlled end is disconnected, and the power receiving circuit unit connected to the controlled end of the relay J1 stops supplying power; at this time, the voltage difference between the two ends of the primary side of the optical coupler U3 disappears, and the secondary side of the optical coupler U3 is not conducting. The MCU2-RXD port connected to the secondary side of the optical coupler U3 receives a low level signal, and the signal receiving end RXD of the slave controller module MCU2 receives the low level sent by the main controller, that is, the data "0".

[0080] (5) Repeat the data "0" or "1" sending process until the "0" and "1" in the data packet are sent, and the signal sending terminal TXD (01) of the main controller MCU1 remains in a high level state;

[0081] (6) When the slave controller module MCU2 parses the data packet and sends a response signal, a data packet containing "0" and "1" is sent from the signal sending terminal TXD of the controller module MCU2 to the signal port MCU2-TXD of the connected carrier signal sending module;

[0082] (7) If data "1" is sent, the signal port MCU2-TXD of the carrier signal sending module is set to a high level, and there is no voltage difference on the primary side of the optocoupler U2. At this time, the secondary side of the optocoupler U2 is not turned on, and there is a bias voltage between the emitter (E pole) and the base (B pole) of the transistor Q2. The emitter (E pole) and the collector (C pole) of the transistor Q2 are turned on, so that the power line on the corresponding circuit unit 1 is energized; after power is turned on, a voltage difference appears on the primary side of the optocoupler U1 of the signal receiving module 1 connected in parallel to the power line. At this time, the secondary side of the optocoupler U1 is turned on, and the MCU1-RXD(01) port connected to the secondary side of the optocoupler U1 receives a high level signal. The signal receiving end RXD(01) of the main controller MCU1 receives the high level sent by the slave controller module MCU2, that is, data "1".

[0083] (8) If data "0" is sent, the signal port MCU2-TXD of the carrier signal sending module is set to a low level, and a voltage difference is formed on the primary side of the optocoupler U2. At this time, the secondary side of the optocoupler U2 is turned on, and the bias voltage of the emitter (E pole) and base (B pole) of the transistor Q2 disappears. The emitter (E pole) and collector (C pole) of the transistor Q2 are not conducting, and then no current flows through the controlled end of the relay module RL1 connected to the circuit unit 1, so that the voltage difference of the primary side of the optocoupler U1 in the signal receiving module 1 connected in parallel with the power line disappears. At this time, the secondary side of the optocoupler U1 is not conducting, and the MCU1-RXD(01) port connected to the secondary side of the optocoupler U1 receives a low level signal. The signal receiving end RXD(01) of the main controller MCU1 receives the low level sent by the slave controller module MCU2, and the main controller receives the low level sent by the slave controller, that is, data "0".

[0084] (9) Repeat the data "0" or "1" sending process until the "0" and "1" in the data packet are sent, the signal sending end of the carrier signal sending module in the circuit unit 1 is restored to the default state, and the signal sending end TXD (01) of the main controller MCU1 is restored to the default state. The main controller MCU1 parses the data packet and obtains the measurement and control data in the circuit unit 1.

[0085] (10) By repeating the above processes (1) to (9), the main controller MCU1 can obtain the measurement and control data in any circuit unit.

Claims

1. An underground low-voltage power supply and carrier communication system, characterized in that: The system includes a power supply circuit unit and a power receiving circuit unit; the power supply circuit unit mainly includes a main controller MCU1, a power supply VCC-1, a relay module RL1, a relay module RL2, a relay module RL3, a signal receiving module 1, a signal receiving module 2, and a signal receiving module 3; the power receiving circuit unit mainly includes a circuit unit 1, a circuit unit 2, and a circuit unit 3, and the three circuit units are respectively composed of a slave controller module, a battery module, a carrier signal sending module, a carrier signal receiving module, and a measurement and control module; one end of the controlled end power line of the relay module RL1, the relay module RL2, and the relay module RL3 is respectively connected to the power line of the circuit unit 1, the circuit unit 2, and the circuit unit 3, and the other end of the controlled end power line is electrically connected to the power supply VCC-1; the control end MCU1-TXD(01) The signal transmitting terminal TXD(01) of the main controller MCU1 is connected, the control terminal MCU1-TXD(02) is connected to the signal transmitting terminal TXD(02) of the main controller MCU1, and the control terminal MCU1-TXD(03) is connected to the signal transmitting terminal TXD(03) of the main controller MCU1; the signal receiving module 1, the signal receiving module 2 and the signal receiving module 3 are respectively connected in parallel to the power lines connected to the relay module RL1, the relay module RL2 and the relay module RL3; the battery module is respectively electrically connected to the slave controller module and the measurement and control module, and the slave controller module is signal-connected to the measurement and control module; the carrier signal transmitting module is connected to the two ends of the triodes in the circuit unit 1, the circuit unit 2 and the circuit unit 3, and the carrier signal receiving module is connected in parallel to the power lines in the circuit unit 1, the circuit unit 2 and the circuit unit 3.

2. The underground low-voltage power supply and carrier communication system according to claim 1 is characterized in that: The MCU1_TXD(01) port of the relay module RL1 is connected to the base of the transistor Q1, the emitter of the transistor Q1 is grounded, the collector is connected to the output terminal of the relay control terminal, and the input terminal of the relay control terminal is connected to the power supply VDD-1 of the main controller; one input terminal of the relay controlled terminal is grounded, and the other input terminal is connected to the power supply VCC-1, and the output terminal of the relay controlled terminal is connected to the circuit unit 1; the MCU1_TXD(02) port of the relay module RL2 is connected to the base of the transistor Q3, the emitter of the transistor Q3 is grounded, the collector is connected to the output terminal of the relay control terminal, and the relay control terminal is connected to the power supply VDD-1 of the main controller; one input terminal of the relay controlled terminal is grounded, and the other input terminal is connected to the power supply VCC-1, and the output terminal of the relay controlled terminal is connected to the circuit unit 1; The input terminal of the terminal is connected to the power supply VDD-1 of the main controller; one input terminal of the relay controlled terminal is grounded, the other input terminal is connected to the power supply VCC-1, and the output terminal of the relay controlled terminal is connected to the circuit unit 2; the MCU1_TXD(03) port of the relay module RL3 is connected to the base of the transistor Q5, the emitter of the transistor Q5 is grounded, the collector is connected to the output terminal of the relay control terminal, and the input terminal of the relay control terminal is connected to the power supply VDD-1 of the main controller; one input terminal of the relay controlled terminal is grounded, the other input terminal is connected to the power supply VCC-1, and the output terminal of the relay controlled terminal is connected to the circuit unit 3.

3. The underground low-voltage power supply and carrier communication system according to claim 1, characterized in that: The signal receiving module 1 is composed of an optical coupler U1, a signal receiving port MCU1-RXD (01) and an auxiliary circuit; the signal receiving port MCU1-RXD (01) is connected to the signal receiving terminal RXD (01) of the main controller MCU1; the primary side of the optical coupler U1 is connected in parallel to the power line connected to the relay module RL1, one end of the secondary side is connected to the power supply VDD-1 of the main controller, and the other end is connected to the signal receiving port MCU1-RXD (01); the signal receiving module 2 is composed of an optical coupler U4, a signal receiving port MCU1-RXD (02) and an auxiliary circuit; the signal receiving port MCU1-RXD (02) is connected to the signal receiving terminal RXD ( 02); the primary side of the optical coupler U4 is connected in parallel to the power line connected to the relay module RL2, one end of the secondary side is connected to the power supply VDD-1 of the main controller, and the other end is connected to the signal receiving port MCU1-RXD (02); the signal receiving module 3 is composed of an optical coupler U7, a signal receiving port MCU1-RXD (03) and an auxiliary circuit; the signal receiving port MCU1-RXD (03) is connected to the signal receiving terminal RXD (03) of the main controller MCU1; the primary side of the optical coupler U7 is connected in parallel to the power line connected to the relay module RL3, one end of the secondary side is connected to the power supply VDD-1 of the main controller, and the other end is connected to the signal receiving port MCU1-RXD (03).

4. The underground low-voltage power supply and carrier communication system according to claim 1, characterized in that: The receiving-end power line in the circuit unit 1 is connected to the emitter of the transistor Q2, the secondary side of the optical coupler U2 of the carrier signal sending module is respectively connected to the base and emitter of the transistor Q2, one end of the primary side of the optical coupler U2 is connected to the power supply VDD-2 of the slave controller module MCU2, and the other end MCU2-TXD is connected to the signal sending end TXD of the slave controller module MCU2; the two ends of the primary side of the optical coupler U3 of the carrier signal receiving module are connected in parallel to the power line in the circuit unit 1, one end of the secondary side of the optical coupler U3 is connected to the power supply VDD-2 of the slave controller module MCU2, and the other end MCU2-RXD is connected to the signal receiving port RXD of the slave controller module MCU2; the measurement and control module includes temperature, pressure, flow sensors and servo motors.

5. The underground low-voltage power supply and carrier communication system according to claim 1, characterized in that: The receiving-end power line in the circuit unit 2 is connected to the emitter of the transistor Q4, the secondary side of the optical coupler U5 of the carrier signal sending module is respectively connected to the base and emitter of the transistor Q4, one end of the primary side of the optical coupler U5 is connected to the power supply VDD-3 of the slave controller module MCU3, and the other end MCU3-TXD is connected to the signal sending end TXD of the slave controller module MCU3; the two ends of the primary side of the optical coupler U6 of the carrier signal receiving module are connected in parallel to the power line in the circuit unit 2, one end of the secondary side of the optical coupler U6 is connected to the power supply VDD-3 of the slave controller module MCU3, and the other end MCU3-RXD is connected to the signal receiving end RXD of the slave controller module MCU3; the measurement and control module includes temperature, pressure, flow sensors and servo motors.

6. The underground low-voltage power supply and carrier communication system according to claim 1, characterized in that: The power line at the receiving end in the circuit unit 3 is connected to the emitter of the transistor Q6, the secondary side of the optical coupler U8 of the carrier signal sending module is respectively connected to the base and emitter of the transistor Q6, one end of the primary side of the optical coupler U8 is connected to the power supply VDD-4 of the slave controller module MCU4, and the other end MCU4-TXD is connected to the signal sending end TXD of the slave controller module MCU4; both ends of the primary side of the optical coupler U9 of the carrier signal receiving module are connected in parallel to the power line in the circuit unit 3, one end of the secondary side of the optical coupler U9 is connected to the power supply VDD-4 of the slave controller module MCU4, and the other end MCU4-RXD is connected to the signal receiving port RXD of the slave controller module MCU4; the measurement and control module includes temperature, pressure, flow sensors and servo motors.

7. The underground low-voltage power supply and carrier communication system according to claim 1, characterized in that: The default state of the signal sending terminals TXD(01), TXD(02) and TXD(03) of the main controller MCU1 is a low level, and the default state of the signal sending terminal of the carrier signal sending module is a high level.

8. An underground low-voltage power supply and carrier communication method, characterized in that: The communication method of the underground low voltage power supply and carrier communication system in claims 1-7 comprises the following steps: Step 1, when the main controller reads the measurement and control data in a certain circuit unit, the main controller sets the signal sending end connected to the corresponding circuit unit to a high level, so that the controlled end of the connected relay module is closed, and the power line in the circuit unit connected to the controlled end is energized and the battery module is charged; Step 2, after the power line is powered on, the main controller sends a data packet containing "0" and "1" to the signal sending end; if "1" is sent, the optical coupler of the carrier signal receiving module in the circuit unit works, and the signal receiving end of the slave controller module receives a high level sent by the main controller; if "0" is sent, the signal sending end is set to a low level, so that the controlled end of the connected relay module is disconnected, and the circuit unit connected to the controlled end is powered off, so that the optical coupler of the carrier signal receiving module in the connected circuit unit does not work, and the signal receiving end of the slave controller module receives a low level sent by the main controller; repeat the "0" or "1" sending process until the "0" and "1" in the data packet are sent, and the signal sending end of the main controller maintains a high level state; Step 3, when the slave controller module parses the data packet and sends a response signal, the slave controller module sends a data packet containing "0" and "1" to the signal port of the connected carrier signal sending module; if "1" is sent, the signal port of the carrier signal sending module is set to a high level, so that the power line on the corresponding circuit unit is energized, and after energization, the optical coupler of the signal receiving module connected in parallel to the power line works, and the signal receiving end of the main controller receives the high level sent by the slave controller module; if "0" is sent, the signal port of the carrier signal sending module is set to a low level, so that the triode on the power line connected to the carrier signal sending module is turned off, and then no current flows through the controlled end of the relay module connected to the circuit unit, so that the signal receiving end of the signal receiving module connected in parallel to the power line is set to a low level, and the main controller receives the low level sent by the slave controller module; Repeat the "0" or "1" sending process until all the "0" and "1" in the data packet are sent; Step 4: the signal sending end of the carrier signal sending module and the signal sending end of the main controller are restored to a default state; the main controller parses the data packet to obtain the measurement and control data in the circuit unit; Step 5: By repeating steps 1-4, the main controller obtains the measurement and control data in any circuit unit.

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