Underground direct current power supply and carrier communication system and bidirectional communication method

Abstract

The invention discloses an underground direct-current power supply and carrier communication system and a bidirectional 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, power needs to be supplied to each underground layer of measurement and control devices, and bidirectional communication needs to be carried out with each underground layer of measurement and control devices. However, an existing system cannot meet 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 and a ground signal receiving module; the power receiving circuit unit comprises a measurement and control circuit unit 1, a measurement and control circuit unit 2 and a measurement and control circuit unit 3; the measurement and control circuit unit 1-3 is composed of a slave controller module, a storage battery module, a carrier signal sending module, a carrier signal receiving module and a measurement and control module. The system adopts a one-master multi-slave direct current power supply and carrier communication mode, so that the reliability of underground power supply and communication is improved, and the field operation efficiency is also improved.

Description

Technical Field

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

[0002] With the rapid development of electronic information technology, power line carrier communication has been widely used in new 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 farther 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, downhole measurement and control instruments not only need cable power supply, but also need to communicate two-way with the ground to control the motor equipment at each layer of the downhole and collect production data (such as temperature, pressure, and flow). The traditional wired communication method requires 1-2 communication lines and power lines to be fixed 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 type cable-free stratified oil production and water injection technology, the ground and the downhole use 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 downhole are normal. In addition, the conventional wave code type cable-free intelligent distributor cannot replenish power after the instrument battery is exhausted and cannot be reused.

[0004] Based on the industry technology development trend and the above-mentioned problems, the present invention designs a real-time data transmission system of underground DC power supply and two-way carrier communication, and designs corresponding power supply circuits and two-way transceiver circuits as well as a half-duplex communication method suitable for transmission in underground DC cables. The present invention not only optimizes the existing cable-based stratified oil production and water injection technology in oil fields, but also reduces the transmission bit error rate of the system, laying a foundation for the intelligent upgrading and transformation of cable-based stratified oil production and water injection technology in oil fields. 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 improve the system's underground stratified measurement and control efficiency. 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 includes a power supply circuit unit and a power receiving circuit unit; the power supply circuit unit mainly includes a main controller, a power supply VCC-1, a relay module RL1, and a ground signal receiving module; the power receiving circuit unit mainly includes a measurement and control circuit unit 1, a measurement and control circuit unit 2, and a measurement and control circuit unit 3, and the measurement and control circuit units 1-3 are respectively composed of a slave controller module, a battery module, a carrier signal sending module, a carrier signal receiving module, a measurement and control module, etc.

[0008] Furthermore, one end of the controlled-end power line of the relay module RL1 is connected to the common power line of the measurement and control circuit unit 1-3, the other end of the controlled-end power line is electrically connected to the power supply VCC-1, and the control end MCU1-TXD is connected to the signal sending end TXD of the main controller; the ground signal receiving module is connected in parallel to the two ends of the series resistor on the power line of the power supply end.

[0009] Furthermore, the battery module is electrically connected to the slave controller module and the measurement and control module respectively, 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 measurement and control circuit unit 1, the measurement and control circuit unit 2 and the measurement and control circuit unit 3, and the carrier signal receiving module is connected in parallel to the power lines in the measurement and control circuit unit 1, the measurement and control circuit unit 2 and the measurement and control circuit unit 3.

[0010] Furthermore, the signal sending terminal MCU1_TXD in 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 end is grounded, and the other input terminal is connected to the power supply VCC-1, and the output terminal of the relay controlled end is connected to the common power line of the measurement and control circuit unit 1-3.

[0011] Furthermore, the ground signal receiving module is composed of an optocoupler U1, a signal receiving port MCU1-RXD and an auxiliary circuit; the signal receiving port MCU1-RXD is connected to the signal receiving terminal RXD of the main controller; the primary side of the optocoupler U1 is connected in parallel to the two ends of the series resistor on the power line at the power supply end, one end of the secondary side of the optocoupler U1 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.

[0012] Furthermore, the power line at the receiving end in the measurement and control circuit unit 1 is connected to the source of the transistor Q2, and the source and gate of the transistor Q2 are connected to the two ends of the resistor R5 in the carrier signal sending module; the signal sending end MCU2-TXD is connected to the signal sending port TXD of the slave controller module MCU2, the base of the transistor Q3 is connected to the signal sending end MCU2-TXD, and is connected to the power supply VDD-2 through a resistor, the collector of the transistor Q3 is connected to the gate of the transistor Q2 through a resistor R6, and the emitter of the transistor Q3 is grounded; the two ends of the primary side of the optical coupler U2 of the carrier signal receiving module are connected in parallel to the power line in the measurement and control circuit unit 1, one end of the secondary 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-RXD is connected to the signal receiving port RXD of the slave controller module MCU2; the measurement and control module mainly includes temperature, pressure, flow sensors and servo motors.

[0013] Furthermore, the power line of the receiving end in the measurement and control circuit unit 2 is connected to the source of the transistor Q4, and the source and gate of the transistor Q4 are connected to the two ends of the resistor R10 in the carrier signal sending module; the signal sending end MCU3-TXD is connected to the signal sending port TXD of the slave controller module MCU3, the base of the transistor Q5 is connected to the signal sending end MCU3-TXD, and is connected to the power supply VDD-3 through a resistor, the collector of the transistor Q5 is connected to the gate of the transistor Q4 through a resistor R11, and the emitter of the transistor Q5 is grounded; 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 measurement and control circuit unit 2, one end of the secondary side of the optical coupler U3 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 mainly includes temperature, pressure, flow sensors and servo motors.

[0014] Furthermore, the power line at the receiving end in the measurement and control circuit unit 3 is connected to the source of the transistor Q6, and the source and gate of the transistor Q6 are connected to the two ends of the resistor R15 in the carrier signal sending module; the signal sending end MCU4-TXD is connected to the signal sending port TXD of the slave controller module MCU4, the base of the transistor Q7 is connected to the signal sending end MCU4-TXD, and is connected to the power supply VDD-4 through a resistor, the collector of the transistor Q7 is connected to the gate of the transistor Q6 through a resistor R16, and the emitter of the transistor Q7 is grounded; 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 measurement and control circuit unit 3, one end of the secondary side of the optical coupler U3 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 mainly includes temperature, pressure, flow sensors and servo motors.

[0015] Furthermore, the default state of the signal sending end TXD of the main controller is a low level, and the default state of the signal sending end of the carrier signal sending module is a high level.

[0016] Furthermore, the communication method of the underground DC power supply and carrier communication system includes the following steps:

[0017] Step 1, when the main controller reads the measurement and control data in a certain measurement and control circuit unit, the signal sending terminal TXD of the main controller is set to a high level, the transistor Q1 is turned on, and the relay control terminal in the relay module passes current, so that the relay controlled terminal is closed, and the common power line of the measurement and control circuit units 1-3 connected to the relay controlled terminal is energized, and the battery module is charged through the power lines in the respective measurement and control circuit units;

[0018] Step 2, after the power line is powered on, the signal sending terminal TXD of the main controller sends a data packet containing "0" and "1" to the signal sending terminal MCU1_TXD in the relay module RL1;

[0019] Step 3, if the data "1" is sent, the signal sending end MCU1_TXD is set to a high level, the transistor Q1 is turned on, the relay control end in the relay module passes current, the relay controlled end is closed, the transistors Q2, Q4 and Q6 connected to the public power line in the measurement and control circuit unit 1-3 pass current, the optical coupler U2, the optical coupler U3 and the optical coupler U4 work, and the signal receiving end of the slave controller module in the measurement and control circuit unit 1-3 receives the high level sent by the main controller;

[0020] Step 4, if the data "0" is sent, the signal sending end MCU1_TXD is set to a low level, the transistor Q1 is turned off, the current of the relay control end in the relay module disappears, the relay controlled end is disconnected, the current of the transistors Q2, Q4 and Q6 connected to the public power line in the measurement and control circuit unit 1-3 disappears, the optical coupler U2, the optical coupler U3 and the optical coupler U4 stop working, and the signal receiving end of the slave controller module in the measurement and control circuit unit 1-3 receives the low level sent by the main controller;

[0021] Step 5, repeat the data "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 remains in a high level state;

[0022] Step 6, the slave controller module parses the data packet and analyzes the address bit in the data packet to determine whether it is the same as its own address bit. If it is the same as its own address bit, the corresponding slave controller module sends a response signal; if it is different from its own address bit, the corresponding slave controller module discards the data packet, sets its own signal sending port to a low level, and delays half a data packet cycle, and restores to the default state after the delay ends;

[0023] Step 7, when sending a response signal, a data packet containing data "0" and "1" is sent from the controller module to the signal sending port of the connected carrier signal sending module;

[0024] Step 8, if the data "1" is sent, the signal sending end in the carrier signal sending module is set to a high level, the transistor connected to the signal sending end is turned on, and a current flows through the power line of the measurement and control circuit unit where the transistor is located. After power is turned on, the optical coupler U1 of the ground signal receiving module connected in parallel to the power line of the power supply end works, and the signal receiving end RXD of the main controller receives the high level sent from the controller module;

[0025] Step 9, if the data "0" is sent, the signal sending end in the carrier signal sending module is set to a low level, the transistor connected to the signal sending end is turned off, and the current on the power line of the measurement and control circuit unit where the transistor is located disappears. After the current disappears, the optical coupler U1 of the ground signal receiving module connected in parallel to the power line of the power supply end stops working, and the signal receiving end RXD of the main controller receives the low level sent from the controller module;

[0026] Step 10, 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 main controller and the signal sending end of the carrier signal sending module are restored to the default state;

[0027] Step 11, the main controller parses the data packet and obtains the measurement and control data in the corresponding measurement and control circuit unit; by repeating steps 1-10, the main controller obtains the measurement and control data in any measurement and control circuit unit.

[0028] The present invention provides an underground DC power supply and carrier communication system and a two-way communication method, which adopt a one-master-multiple-slave DC carrier communication circuit design. Through the underground power line, not only can the power supply of the layered measurement and control device be realized, but also the two-way communication function of the ground controller to the underground layered measurement and control device can be realized, thereby solving the current problems of underground DC carrier communication having high requirements for power supply, relatively stable working voltage, and difficult layered measurement and control. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 This is a structural diagram of the underground DC power supply and carrier communication system.

[0030] Figure 2 Flow chart for the two-way communication between underground DC power supply and carrier communication system. DETAILED DESCRIPTION

[0031] 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.

[0032] like Figure 1 The underground DC power supply and carrier communication system shown includes a power supply circuit unit and a power receiving circuit unit;

[0033] The power supply circuit unit mainly includes the main controller MCU1, the power supply VCC-1, the relay module RL1, the ground signal receiving module 1, the resistor R3 and the power supply end power line. The relay module RL1 mainly includes the relay J1, the transistor Q1, the resistor R4, the capacitor C2 and the diode D1. The ground signal receiving module mainly includes the capacitor C1, the resistor R1, the resistor R2 and the optical coupler U1.

[0034] The power receiving circuit unit at least includes a measurement and control circuit unit 1, a measurement and control circuit unit 2 and a measurement and control circuit unit 3, and the three measurement and control circuit units 1-3 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. In addition, the measurement and control circuit unit 1 also includes at least a transistor Q2, a resistor R8, a capacitor C4, and a diode D2; the measurement and control circuit unit 2 also includes at least a transistor Q4, a resistor R13, a capacitor C6, and a diode D3; the measurement and control circuit unit 3 also includes at least a transistor Q6, a resistor R18, a capacitor C8, and a diode D4.

[0035] The carrier signal sending module in the measurement and control circuit unit 1 includes resistor R5, resistor R6, transistor Q3 and resistor R9 and a signal sending end MCU2-TXD; the carrier signal receiving module in the measurement and control circuit unit 1 includes an optical coupler U2, a resistor R7, a capacitor C3 and a signal receiving end MCU2-RXD.

[0036] The carrier signal sending module in the measurement and control circuit unit 2 includes resistor R10, resistor R11, transistor Q5 and resistor R14 and a signal sending terminal MCU3-TXD; the carrier signal receiving module in the measurement and control circuit unit 2 includes an optical coupler U3, a resistor R12, a capacitor C5 and a signal receiving terminal MCU3-RXD.

[0037] The carrier signal sending module in the measurement and control circuit unit 3 includes resistor R15, resistor R16, transistor Q7 and resistor R19 and a signal sending terminal MCU4-TXD; the carrier signal receiving module in the measurement and control circuit unit 3 includes an optical coupler U4, a resistor R17, a capacitor C7 and a signal receiving terminal MCU4-RXD.

[0038] The ground signal receiving module is connected in parallel to the two ends of the series resistor R3 on the power line of the power supply end; one end of the controlled power line of the relay module RL1 is connected to the common power line of the measurement and control circuit unit 1-3, and the other end of the controlled power line is electrically connected to the power supply VCC-1, and the control end MCU1-TXD is connected to the signal sending end TXD of the main controller.

[0039] The battery module Battery is electrically connected to the slave controller module and the measurement and control module respectively, 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 measurement and control circuit unit 1, the measurement and control circuit unit 2 and the measurement and control circuit unit 3, and the carrier signal receiving module is connected in parallel to the power lines in the measurement and control circuit unit 1, the measurement and control circuit unit 2 and the measurement and control circuit unit 3.

[0040] The signal sending terminal MCU1_TXD in 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 control terminal of the relay J1, and the input terminal of the control terminal of the relay J1 is connected to the power supply VDD-1 of the main controller MCU1; one input terminal of the controlled end of the relay J1 is grounded, and the other input terminal is connected to the power supply VCC-1 through the power line of the power supply end, and the output terminal of the controlled end of the relay J1 is connected to the common power line of the measurement and control circuit unit 1-3.

[0041] The ground signal receiving module is composed of an optocoupler U1, a signal receiving port MCU1-RXD and an auxiliary circuit; the signal receiving port MCU1-RXD is connected to the signal receiving terminal RXD of the main controller MCU1; the primary side of the optocoupler U1 is connected in parallel to the two ends of the series resistor R3 on the power line at the power supply end, one end of the secondary side of the optocoupler U1 is connected to the power supply VDD-1 of the main controller MCU1, and the other end is connected to the signal receiving port MCU1-RXD.

[0042] The power line at the receiving end in the measurement and control circuit unit 1 is connected to the source of the transistor Q2, and the source and gate of the transistor Q2 are connected to the two ends of the resistor R5 in the carrier signal sending module; the signal sending end MCU2-TXD is connected to the signal sending port TXD of the slave controller module MCU2, the base of the transistor Q3 is connected to the signal sending end MCU2-TXD, and is connected to the power supply VDD-2 through a resistor, the collector of the transistor Q3 is connected to the gate of the transistor Q2 through a resistor R6, and the emitter of the transistor Q3 is grounded; the two ends of the primary side of the optical coupler U2 of the carrier signal receiving module are connected in parallel to the power line in the measurement and control circuit unit 1, one end of the secondary 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-RXD is connected to the signal receiving port RXD of the slave controller module MCU2; the measurement and control module mainly includes temperature, pressure, flow sensors and servo motors.

[0043] The power line at the receiving end in the measurement and control circuit unit 2 is connected to the source of the transistor Q4, and the source and gate of the transistor Q4 are connected to the two ends of the resistor R10 in the carrier signal sending module; the signal sending end MCU3-TXD is connected to the signal sending port TXD of the slave controller module MCU3, the base of the transistor Q5 is connected to the signal sending end MCU3-TXD, and is connected to the power supply VDD-3 through a resistor, the collector of the transistor Q5 is connected to the gate of the transistor Q4 through a resistor R11, and the emitter of the transistor Q5 is grounded; 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 measurement and control circuit unit 2, one end of the secondary side of the optical coupler U3 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 mainly includes temperature, pressure, flow sensors and servo motors.

[0044] The power line at the receiving end in the measurement and control circuit unit 3 is connected to the source of the transistor Q6, and the source and gate of the transistor Q6 are connected to the two ends of the resistor R15 in the carrier signal sending module; the signal sending end MCU4-TXD is connected to the signal sending port TXD of the slave controller module MCU4, the base of the transistor Q7 is connected to the signal sending end MCU4-TXD, and is connected to the power supply VDD-4 through a resistor, the collector of the transistor Q7 is connected to the gate of the transistor Q6 through a resistor R16, and the emitter of the transistor Q7 is grounded; 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 measurement and control circuit unit 3, one end of the secondary side of the optical coupler U3 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 mainly includes temperature, pressure, flow sensors and servo motors.

[0045] For ease of understanding, the initial state and ports of the system are described in detail below:

[0046] The default state of the signal sending terminal TXD 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 measurement and control circuit unit 1 - 3 is a high level.

[0047] 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 control terminal of a relay J1 in the relay module RL1 through a resistor R4.

[0048] The output end of the secondary side of the optical coupler U1 is also grounded through a resistor R1 and a capacitor C1 connected in parallel, and the input end of the secondary side is connected to the power supply VDD-1 of the main controller MCU1 through a resistor R2 connected in series.

[0049] The transistors Q2, Q4 and Q6 are PMOS transistors. The secondary side of the optical coupler U2 is also grounded through a resistor R7 and a capacitor C3 connected in parallel. The secondary side of the optical coupler U3 is also grounded through a resistor R12 and a capacitor C5 connected in parallel. The secondary side of the optical coupler U4 is also grounded through a resistor R17 and a capacitor C7 connected in parallel.

[0050] The power supply VDD-1 provides power to the main controller MCU1, the control end of the relay J1, and the secondary side of the optical coupler U1;

[0051] The power supply VDD-2 provides power to the slave controller module MCU2 and the secondary side of the optical coupler U2 of the measurement and control circuit unit 1;

[0052] The power supply VDD-3 provides power to the slave controller module MCU3 and the secondary side of the optical coupler U3 of the measurement and control circuit unit 2;

[0053] The power supply VDD-4 provides power to the slave controller module MCU4 and the secondary side of the optical coupler U4 of the measurement and control circuit unit 3;

[0054] For ease of understanding, the DC power supply and two-way carrier communication process of the system are described in detail below:

[0055] The power supply process of the system is as follows:

[0056] When the power supply circuit unit on the ground charges the battery module Battery in the underground measurement and control circuit unit, its main controller MCU1 sets the corresponding signal sending end TXD pin to a high level, the transistor Q1 is turned on, and the control end of the relay J1 in the relay module RL1 passes current, so that the controlled end of the relay J1 is closed, and the common power line of the measurement and control circuit unit 1-3 connected to the controlled end of the relay J1 is energized. After the common power line is energized, the transistor Q2, the transistor Q4, and the transistor Q6 in the measurement and control circuit unit 1-3 respectively have current passing through them, and charge the battery module Battery through their respective power lines;

[0057] The two-way carrier communication method of the system is as follows:

[0058] (1) Step 1, when the main controller MCU1 reads the measurement and control data in a certain measurement and control circuit unit, the signal sending terminal TXD of the main controller MCU1 is set to a high level, the transistor Q1 is turned on, and the control terminal of the relay J1 in the relay module RL1 passes current, so that the controlled terminal of the relay J1 is closed, and the common power line of the measurement and control circuit units 1-3 connected to the controlled terminal of the relay J1 is energized, and the battery module Battery is charged through the power lines in each measurement and control circuit unit;

[0059] (2) Step 2, after the power line is powered on, the signal sending terminal TXD of the main controller MCU1 sends a data packet containing "0" and "1" to the signal sending terminal MCU1_TXD in the relay module RL1;

[0060] (3) Step 3, if the data "1" is sent, the signal sending terminal MCU1_TXD is set to a high level, the transistor Q1 is turned on, the control terminal of the relay J1 in the relay module RL1 passes current, the controlled terminal of the relay J1 is closed, the transistor Q2, the transistor Q4 and the transistor Q6 connected to the common power line in the measurement and control circuit unit 1-3 pass current, the optical coupler U2, the optical coupler U3 and the optical coupler U4 work, and the signal receiving terminal RXD of the slave controller module in the measurement and control circuit unit 1-3 receives the high level sent by the main controller MCU1;

[0061] (4) Step 4, if the data "0" is sent, the signal sending end MCU1_TXD is set to a low level, the transistor Q1 is turned off, the current at the control end of the relay J1 in the relay module RL1 disappears, the controlled end of the relay J1 is disconnected, the current passing through the transistors Q2, Q4 and Q6 connected to the public power line in the measurement and control circuit unit 1-3 disappears, the optical coupler U2, the optical coupler U3 and the optical coupler U4 stop working, and the signal receiving end RXD of the slave controller module in the measurement and control circuit unit 1-3 receives the low level sent by the main controller MCU1;

[0062] (5) Step 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 of the main controller MCU1 remains in a high level state;

[0063] (6) Step 6, the slave controller module parses the data packet and analyzes the address bits in the data packet to determine whether they are the same as its own address bits. If they are the same as its own address bits, the corresponding slave controller module sends a response signal; if they are different from its own address bits, the corresponding slave controller module discards the data packet, sets its own signal sending end TXD to a low level, and delays half a data packet cycle (the time for the main controller MCU1 to obtain the measurement and control data in a certain measurement and control circuit unit is one data packet cycle), and restores the default state after the delay ends;

[0064] (7) Step 7, when sending a response signal, a data packet containing data "0" and "1" is sent from the controller module to the signal sending port of the connected carrier signal sending module;

[0065] (8) Step 8, if the data "1" is sent, the signal sending end in the carrier signal sending module is set to a high level, the transistor connected to the signal sending end is turned on, and a current flows through the power line of the measurement and control circuit unit where the transistor is located. After power is turned on, the optical coupler U1 of the ground signal receiving module connected in parallel to the power line of the power supply end works, and the signal receiving end RXD of the main controller MCU1 receives the high level sent from the controller module;

[0066] (9) Step 9, if the data "0" is sent, the signal sending end in the carrier signal sending module is set to a low level, the transistor connected to the signal sending end is turned off, and the current on the power line of the measurement and control circuit unit where the transistor is located disappears. After the current disappears, the optical coupler U1 of the ground signal receiving module connected in parallel to the power line of the power supply end stops working, and the signal receiving end RXD of the main controller MCU1 receives the low level sent from the controller module;

[0067] (10) Step 10, 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 main controller MCU1 and the signal sending end of the carrier signal sending module are restored to the default state;

[0068] (11) Step 11, the main controller MCU1 parses the data packet and obtains the measurement and control data in the corresponding measurement and control circuit unit; by repeating steps 1-10, the main controller MCU1 obtains the measurement and control data in any measurement and control circuit unit.

Claims

1. An underground DC 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, a power supply VCC-1, a relay module RL1, and a ground signal receiving module; the power receiving circuit unit mainly includes a measurement and control circuit unit 1, a measurement and control circuit unit 2, and a measurement and control circuit unit 3, wherein the measurement and control circuit units 1-3 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 is connected to the common power line of the measurement and control circuit units 1-3, and the other end of the controlled end power line is connected to the common power line of the measurement and control circuit units 1-3. The end is electrically connected to the power supply VCC-1, and the control end MCU1-TXD is connected to the signal sending end TXD of the main controller; the ground signal receiving module is connected in parallel to the two ends of the series resistor on the power line of the power supply end; the battery module is electrically connected to the slave controller module and the measurement and control module respectively, and the slave controller module is connected to the measurement and control module signal; the carrier signal sending module is connected to the two ends of the transistors in the measurement and control circuit unit 1, the measurement and control circuit unit 2 and the measurement and control circuit unit 3, and the carrier signal receiving module is connected in parallel to the power lines in the measurement and control circuit unit 1, the measurement and control circuit unit 2 and the measurement and control circuit unit 3.

2. The underground DC power supply and carrier communication system according to claim 1, characterized in that: The signal sending terminal MCU1_TXD in 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 common power line of the measurement and control circuit unit 1-3.

3. The underground DC power supply and carrier communication system according to claim 1, characterized in that: The ground signal receiving module is composed of a signal receiving port MCU1-RXD, an optical coupler U1 and an auxiliary circuit; the signal receiving port MCU1-RXD is connected to the signal receiving terminal RXD of the main controller; the primary side of the optical coupler U1 is connected in parallel to the two ends of the series resistor on the power line of the power supply end, one end of the secondary side of the optical coupler U1 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.

4. The underground DC power supply and carrier communication system according to claim 1, characterized in that: The power line at the receiving end in the measurement and control circuit unit 1 is connected to the source of the transistor Q2, and the source and gate of the transistor Q2 are connected to the two ends of the resistor R5 in the carrier signal sending module; the signal sending end MCU2-TXD is connected to the signal sending port TXD of the slave controller module MCU2, the base of the transistor Q3 is connected to the signal sending end MCU2-TXD, and is connected to the power supply VDD-2 through a resistor, the collector of the transistor Q3 is connected to the gate of the transistor Q2 through a resistor R6, and the emitter of the transistor Q3 is grounded; the two ends of the primary side of the optical coupler U2 of the carrier signal receiving module are connected in parallel to the power line in the measurement and control circuit unit 1, one end of the secondary 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-RXD is connected to the signal receiving port RXD of the slave controller module MCU2; the measurement and control module mainly includes temperature, pressure, flow sensors and servo motors.

5. The underground DC power supply and carrier communication system according to claim 1, characterized in that: The power line of the receiving end in the measurement and control circuit unit 2 is connected to the source of the transistor Q4, and the source and gate of the transistor Q4 are connected to the two ends of the resistor R10 in the carrier signal sending module; the signal sending end MCU3-TXD is connected to the signal sending port TXD of the slave controller module MCU3, the base of the transistor Q5 is connected to the signal sending end MCU3-TXD, and is connected to the power supply VDD-3 through a resistor, the collector of the transistor Q5 is connected to the gate of the transistor Q4 through a resistor R11, and the emitter of the transistor Q5 is grounded; 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 measurement and control circuit unit 2, one end of the secondary side of the optical coupler U3 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 mainly includes temperature, pressure, flow sensors and servo motors.

6. The underground DC power supply and carrier communication system according to claim 1, characterized in that: The power line of the receiving end in the measurement and control circuit unit 3 is connected to the source of the transistor Q6, and the source and gate of the transistor Q6 are connected to the two ends of the resistor R15 in the carrier signal sending module; The signal sending end MCU4-TXD is connected to the signal sending port TXD of the slave controller module MCU4, the base of the transistor Q7 is connected to the signal sending end MCU4-TXD, and is connected to the power supply VDD-4 through a resistor, the collector of the transistor Q7 is connected to the gate of the transistor Q6 through a resistor R16, and the emitter of the transistor Q7 is grounded; 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 measurement and control circuit unit 3, one end of the secondary side of the optical coupler U3 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 mainly 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 terminal TXD of the main controller is a low level, and the default state of the signal sending terminal of the carrier signal sending module is a high level.

8. A method for underground DC power supply and carrier two-way communication, characterized in that: The communication method of the underground DC 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 measurement and control circuit unit, the signal sending terminal TXD of the main controller is set to a high level, the transistor Q1 is turned on, and the relay control terminal in the relay module passes current, so that the relay controlled terminal is closed, and the common power line of the measurement and control circuit units 1-3 connected to the relay controlled terminal is energized, and the battery module is charged through the power lines in the respective measurement and control circuit units; Step 2, after the power line is powered on, the signal sending terminal TXD of the main controller sends a data packet containing "0" and "1" to the signal sending terminal MCU1_TXD in the relay module RL1; Step 3, if the data "1" is sent, the signal sending end MCU1_TXD is set to a high level, the transistor Q1 is turned on, the relay control end in the relay module passes current, the relay controlled end is closed, the transistors Q2, Q4 and Q6 connected to the public power line in the measurement and control circuit unit 1-3 pass current, the optical coupler U2, the optical coupler U3 and the optical coupler U4 work, and the signal receiving end of the slave controller module in the measurement and control circuit unit 1-3 receives the high level sent by the main controller; Step 4, if the data "0" is sent, the signal sending end MCU1_TXD is set to a low level, the transistor Q1 is turned off, the current of the relay control end in the relay module disappears, the relay controlled end is disconnected, the current of the transistors Q2, Q4 and Q6 connected to the public power line in the measurement and control circuit unit 1-3 disappears, the optical coupler U2, the optical coupler U3 and the optical coupler U4 stop working, and the signal receiving end of the slave controller module in the measurement and control circuit unit 1-3 receives the low level sent by the main controller; Step 5, repeat the data "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 remains in a high level state; Step 6, the slave controller module parses the data packet and analyzes the address bit in the data packet to determine whether it is the same as its own address bit. If it is the same as its own address bit, the corresponding slave controller module sends a response signal; if it is different from its own address bit, the corresponding slave controller module discards the data packet, sets its own signal sending port to a low level, and delays half a data packet cycle, and restores to the default state after the delay ends; Step 7, when sending a response signal, a data packet containing data "0" and "1" is sent from the controller module to the signal sending port of the connected carrier signal sending module; Step 8, if the data "1" is sent, the signal sending end in the carrier signal sending module is set to a high level, the transistor connected to the signal sending end is turned on, and a current flows through the power line of the measurement and control circuit unit where the transistor is located. After power is turned on, the optical coupler U1 of the ground signal receiving module connected in parallel to the power line of the power supply end works, and the signal receiving end RXD of the main controller receives the high level sent from the controller module; Step 9, if the data "0" is sent, the signal sending end in the carrier signal sending module is set to a low level, the transistor connected to the signal sending end is turned off, and the current on the power line of the measurement and control circuit unit where the transistor is located disappears. After the current disappears, the optical coupler U1 of the ground signal receiving module connected in parallel to the power line of the power supply end stops working, and the signal receiving end RXD of the main controller receives the low level sent from the controller module; Step 10, 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 main controller and the signal sending end of the carrier signal sending module are restored to the default state; Step 11, the main controller parses the data packet and obtains the measurement and control data in the corresponding measurement and control circuit unit; by repeating steps 1-10, the main controller obtains the measurement and control data in any measurement and control circuit unit.

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