A dual-bus communication and energy transmission system

Abstract

The present invention discloses a dual-bus communication and energy transmission system, comprising a slave unit (1) and a host unit (2), wherein the slave unit (1) and the host unit (2) are connected to a bus B (4) via a bus A (3), wherein the slave unit (1) comprises a slave energy storage module (5), a slave microprocessor (6), a slave RS485 transceiver module (7), and a slave optical coupling switch module (8), and wherein the host unit (2) comprises a host optical coupling switch module (9), a host RS485 transceiver module (10), a host microprocessor (11), a DC-DC module (12), and a host energy storage module (13). Information transmission and energy transmission can be realized between the master and slave units by only relying on the dual buses, thereby saving wire materials, having low power consumption, and having strong scalability, and can be applied to improving traditional wired sensor networks or distributed energy collection and other occasions.

Description

Technical Field

[0001] The present invention relates to the field of two-bus communication and energy transmission, and in particular to a two-bus communication and energy transmission system. Background Art

[0002] In the field of communication and control, the dual-bus technology that transmits power and signals at the same time has always been the focus of common concern of the majority of engineering and technical personnel. The dual-bus technology refers to the use of only two wires to connect the host and each slave node. These two wires are used as power transmission lines to provide power to each node, and as signal lines to enable nodes to communicate with each other. Compared with the traditional multi-bus technology, the dual-bus system has the advantages of simple structure, clear division of labor, low cost, and high reliability. In addition, the dual-bus system also has the characteristics of simple interface and small number of buses. In large-scale, remote monitoring systems, such as petroleum, chemical, electric power, fire monitoring, water conservancy monitoring and other systems, it is necessary to accurately and reliably collect the data measured by these detectors, and the master control station also needs to send some control commands to the actuator. In view of the characteristics of this system covering a wide geographical range, a large number of sensors and scattered installation, when the communication distance is long, the wire cost advantage is obvious. The monitoring system using the dual-bus structure has the advantages of easy installation and maintenance, reduced cost, and strong anti-interference ability. It has a very broad development prospect in the application field where relevant physical quantities of multiple production and living places need to be monitored.

[0003] The implementation of the two-bus system usually adopts the scheme of superimposing carrier signals on the power transmission line, such as the invention patent "A two-bus remote power supply and communication device (CN2433782Y)" and the invention patent "A two-bus remote power supply and its communication system (CN1127237C)". However, the communication node couples the signal to the power transmission line, which requires a special signal modulation circuit. When receiving the signal, a special demodulation circuit is also required, resulting in large power transmission losses and high manufacturing costs for the equipment. At the same time, the process requires sensitivity adjustment and poor scalability. In addition, since it is difficult to achieve complete isolation, the carrier signal is often interfered by the power supply circuit and the power consumption circuit, resulting in a short signal transmission distance, low communication speed, and small node capacity, which greatly increases the performance requirements for power supply equipment and power consumption equipment. In addition, in these occasions, the communication data is mainly control information or status information, and the amount of information is relatively small; the real-time communication is relatively weak, and the time response is long. Some people have also proposed new two-bus implementation schemes. For example, Microcomputers and Applications, Issue 9, 2012, Pages 58-59, reported on the research on two-bus technology for time-division transmission of energy / information. The energy / information transmission of two buses was realized by time-division multiplexing, but there are still problems such as complex circuits, poor scalability, low communication rate, and cumbersome sensitivity adjustment. In some application fields, the system is required to be powerful and have ultra-low power consumption characteristics, such as distributed energy harvesting systems. Due to the low density and randomness of weak energy distribution in the environment, the harvested energy is limited, and the power consumption of the conventional two-bus system is too high, making it difficult to apply the conventional two-bus system in it.

[0004] In view of the above defects, the present invention designs a dual-bus communication and energy transmission system, which realizes mode switching through the optocoupler switch module and RS485 transceiver module in the master and slave units. It has high communication rate and strong scalability, and can effectively reduce the system energy transmission loss. Summary of the invention

[0005] The purpose of the present invention is to provide a dual-bus communication and energy transmission system, which realizes mode switching through the optocoupler switch module and the RS485 transceiver module in the master and slave units, so that information transmission and energy transmission can be achieved between the master and slave units only by relying on two buses, and can be applied to improve traditional wired sensor networks or distributed energy collection and other occasions.

[0006] In order to achieve the purpose of the present invention, the following technology is proposed: a two-bus communication and energy transmission system, characterized in that it includes a slave unit (1) and a host unit (2), the slave unit (1) and the host unit (2) are connected through two buses formed by a bus A (3) and a bus B (4), the slave unit (1) includes a slave energy storage module (5), a slave microprocessor (6), a slave RS485 transceiver module (7), and a slave optical coupling switch module (8), and the host unit (2) includes a host optical coupling switch module (9), a host RS485 transceiver module (10), a host microprocessor (11), a DC-DC module (12), and a host energy storage module (13). The slave RS485 transceiver module (7) comprises a slave RS485 chip and a resistor R1, the two ends of the resistor R1 are respectively connected to the A pin and the B pin of the slave RS485 chip, the RXD port, the TXD port, the GPIO1 port and the GPIO2 port of the slave microprocessor (6) are respectively connected to the RO pin, the DI pin, the / R / E pin and the DE pin of the slave RS485 transceiver module (7), the slave energy storage module (5) comprises a slave energy storage and a sliding rheostat RP1, the Vcc1 pin and the GND1 pin of the slave energy storage are respectively connected to the two fixed contacts of the sliding rheostat RP1, and the sliding rheostat The moving contact of the device RP1 is connected to the GPIO4 port of the slave microprocessor (6), the slave optocoupler switch module (8) comprises a slave optocoupler switch 1 and a slave optocoupler switch 2, the IN end of the slave optocoupler switch 1 is connected to the IN end of the slave optocoupler switch 2 and then connected to the GPIO3 port of the slave microprocessor (6), the NO end of the slave optocoupler switch 1 is connected to Vcc1, the NO end of the slave optocoupler switch 2 is connected to GND1, the COM end of the slave optocoupler switch 1 is connected to the B pin of the slave RS485 chip and then connected to the bus B (4), and the COM end of the slave optocoupler switch 2 is connected to the A pin of the slave RS485 and then connected to the bus A (3).The host RS485 transceiver module (10) comprises a host RS485 chip and a resistor R2, wherein the two ends of the resistor R2 are respectively connected to the A pin and the B pin of the host RS485 chip, the RXD port, the TXD port, the GPIO1 port and the GPIO2 port of the host microprocessor (11) are respectively connected to the RO pin, the DI pin, the / R / E pin and the DE pin of the host RS485 chip, the host energy storage module (13) comprises a host energy storage and a sliding rheostat RP2, the Vcc2 end of the host energy storage is connected to one of the fixed contacts of the sliding rheostat RP2 and then connected to the IO2 end of the DC-DC module (12), the GND2 end of the host energy storage is connected to the other fixed contact of the sliding rheostat RP2 and then connected to the DC- The host optical coupler switch module (9) comprises a host optical coupler switch 1 and a host optical coupler switch 2, wherein the IN end of the host optical coupler switch 1 is connected to the IN end of the host optical coupler switch 2 and then connected to the GPIO3 port of the host microprocessor (11), the NO end of the host optical coupler switch 1 is connected to the IO1 end of the DC-DC module (12), the NO end of the host optical coupler switch 2 is connected to the GND end of the DC-DC module (12), the COM end of the host optical coupler switch 1 is connected to the B pin of the host RS485 chip and then connected to the bus B (4), and the COM end of the host optical coupler switch 2 is connected to the A pin of the host RS485 and then connected to the bus A (3).

[0007] Beneficial effects of the present invention:

[0008] 1. The master and slave units can communicate or transmit energy only through two buses, saving wires and simplifying wiring.

[0009] 2. Based on RS485 bus design, there are few peripheral circuits, low power consumption and strong scalability. When new equipment needs to be introduced, it only needs to assign a new address to the newly connected equipment to connect to the system.

[0010] In order to further understand the features and technical contents of the present invention, please refer to the following detailed description and drawings of the present invention. However, the drawings are only provided for reference and illustration and are not intended to limit the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Figure 1 This is a schematic diagram of the overall structure of a dual-bus communication and energy transmission system proposed by the present invention.

[0012] Figure 2 This is a circuit connection diagram of a dual-bus communication and energy transmission system proposed by the present invention.

[0013] Figure 3 This is a schematic diagram of the connection between a host unit and a slave unit based on a dual-bus communication and energy transmission system proposed by the present invention.

[0014] 1: slave unit; 2: host unit; 3: bus A; 4: bus B; 5: slave energy storage module; 6: slave microprocessor; 7: slave RS485 transceiver module; 8: slave optocoupler switch module; 9: host optocoupler switch module; 10: host RS485 transceiver module; 11: host microprocessor; 12: DC-DC module; 13: host energy storage module. DETAILED DESCRIPTION

[0015] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the accompanying drawings in the embodiments of the present invention.

[0016] Specifically, refer to Figure 1 A two-bus communication and energy transmission system comprises a slave unit (1) and a host unit (2), wherein the slave unit (1) and the host unit (2) are connected via two buses formed by a bus A (3) and a bus B (4), wherein the slave unit (1) comprises a slave energy storage module (5), a slave microprocessor (6), a slave RS485 transceiver module (7), and a slave optical coupling switch module (8), and the two buses formed by the bus A (3) and the bus B (4) connect the slave RS485 transceiver module (7) and the slave optical coupling switch module (8), the slave optical coupling switch module (8) connects the slave energy storage module (5), the slave energy storage module (5) connects the slave RS485 transceiver module (7) and the slave microprocessor (6), and the slave microprocessor (6) connects the slave RS485 transceiver module (7) ) and a slave optical coupling switch module (8), the host unit (2) comprises a host optical coupling switch module (9), a host RS485 transceiver module (10), a host microprocessor (11), a DC-DC module (12), and a host energy storage module (13), and the two buses formed by bus A (3) and bus B (4) connect the host RS485 transceiver module (10) and the host optical coupling switch module (9), the host optical coupling switch module (9) is connected to the DC-DC module (12), the DC-DC module (12) is connected to the host energy storage module (13), the host energy storage module (13) is connected to the host RS485 transceiver module (10) and the host microprocessor (11), and the host microprocessor (11) is connected to the host RS485 transceiver module (10) and the host optical coupling switch module (9).

[0017] Specifically, refer to Figure 2The slave RS485 transceiver module (7) includes a slave RS485 chip and a resistor R1, the two ends of the resistor R1 are respectively connected to the A pin and the B pin of the slave RS485 chip, the RXD port, the TXD port, the GPIO1 port and the GPIO2 port of the slave microprocessor (6) are respectively connected to the RO pin, the DI pin, the / R / E pin and the DE pin of the slave RS485 transceiver module (7), the slave energy storage module (5) includes a slave energy storage and a sliding rheostat RP1, the Vcc1 pin and the GND1 pin of the slave energy storage are respectively connected to the two fixed contacts of the sliding rheostat RP1, and the sliding rheostat The moving contact of the device RP1 is connected to the GPIO4 port of the slave microprocessor (6), the slave optocoupler switch module (8) comprises a slave optocoupler switch 1 and a slave optocoupler switch 2, the IN end of the slave optocoupler switch 1 is connected to the IN end of the slave optocoupler switch 2 and then connected to the GPIO3 port of the slave microprocessor (6), the NO end of the slave optocoupler switch 1 is connected to Vcc1, the NO end of the slave optocoupler switch 2 is connected to GND1, the COM end of the slave optocoupler switch 1 is connected to the B pin of the slave RS485 chip and then connected to the bus B (4), and the COM end of the slave optocoupler switch 2 is connected to the A pin of the slave RS485 and then connected to the bus A (3). The host RS485 transceiver module (10) comprises a host RS485 chip and a resistor R2, wherein the two ends of the resistor R2 are respectively connected to the A pin and the B pin of the host RS485 chip, the RXD port, the TXD port, the GPIO1 port and the GPIO2 port of the host microprocessor (11) are respectively connected to the RO pin, the DI pin, the / R / E pin and the DE pin of the host RS485 chip, the host energy storage module (13) comprises a host energy storage and a sliding rheostat RP2, the Vcc2 end of the host energy storage is connected to one of the fixed contacts of the sliding rheostat RP2 and then connected to the IO2 end of the DC-DC module (12), the GND2 end of the host energy storage is connected to the other fixed contact of the sliding rheostat RP2 and then connected to the DC- The host optical coupler switch module (9) comprises a host optical coupler switch 1 and a host optical coupler switch 2, wherein the IN end of the host optical coupler switch 1 is connected to the IN end of the host optical coupler switch 2 and then connected to the GPIO3 port of the host microprocessor (11), the NO end of the host optical coupler switch 1 is connected to the IO1 end of the DC-DC module (12), the NO end of the host optical coupler switch 2 is connected to the GND end of the DC-DC module (12), the COM end of the host optical coupler switch 1 is connected to the B pin of the host RS485 chip and then connected to the bus B (4), and the COM end of the host optical coupler switch 2 is connected to the A pin of the host RS485 and then connected to the bus A (3).

[0018] Specifically, refer to Figure 3 The host unit (2) is connected to the bus A (3) and the bus B (4) to form two buses, and the slave units 1, 2, and finally the slave unit N are connected to the host unit (2) through the bus A (3) and the bus B (4) to form two buses.

[0019] Specifically, the system is applied to improve the traditional wired sensor network. Addresses are assigned to all slave units. When the two buses are used for mutual communication between the slave unit and the host unit, the sensor can send the collected environmental information to the host unit through the slave RS485 transceiver module (7) in the slave unit, and can also receive signal instructions from the host unit. At the same time, the slave microprocessor (6) in the slave unit will continuously detect the voltage of the slave energy storage module (5) in the slave unit. When it is found that the voltage is lower than the set value and the slave unit is at risk of stopping working, the slave microprocessor (6) in the slave unit will send a signal to the host unit through the slave RS485 transceiver module (7) and the A and B buses, indicating that the host needs to provide power to maintain work. After receiving the signal, the host unit will send a response signal to the slave unit. The host microprocessor (11) in the host unit and the slave microprocessor (6) in the slave unit respectively control the optical coupler switches in the host unit and the slave unit to close. At this time, the A and B buses are used to transmit energy, and the host unit starts to transmit energy to the slave unit to maintain the operation of the sensor in the slave unit. When a new slave unit needs to be expanded, it is only necessary to connect the A and B pins of the slave RS485 transceiver module (7) in the slave unit to the A and B buses respectively, and assign a new address to the slave unit.

[0020] Specifically, the system is applied to distributed energy collection. Addresses are assigned to all slave units. The energy collection device stores the collected environmental energy in the slave energy storage module (5) of the slave unit. The slave microprocessor (6) in the slave unit continuously detects the voltage of the slave energy storage module (5). When the voltage of the slave energy storage module (5) in a certain slave unit reaches a set value, the slave microprocessor (6) in the slave unit will send a signal to the host unit through the slave RS485 transceiver module (7), indicating that the collected energy can be transmitted to the host. At this time, the two buses are used for mutual communication between the slave unit and the host unit. After receiving the signal, the host unit sends a response signal to the slave unit. The host microprocessor (11) in the host unit and the slave microprocessor (6) in the slave unit respectively control the host unit and the optical coupler switch in the slave unit to close. The slave unit starts to transmit energy to the host unit and stores the collected energy in the energy storage module (13) of the host unit. At this time, the two buses are used to transmit energy. When a new slave unit needs to be expanded, it is only necessary to connect the A and B pins of the slave RS485 transceiver module (7) of the slave unit to the A and B buses respectively, and allocate a new address to the slave unit.

[0021] Specifically, the system can be used to combine traditional wired sensor networks with distributed energy collection. Addresses are assigned to all slave units. When the second bus is not used to transmit energy, the sensor can send the collected environmental information to the host unit through the slave RS485 transceiver module (7) of the slave unit, and can also receive signal instructions from the host unit. When the environmental energy is sufficient, the energy collection device stores the collected environmental energy in the slave energy storage module (5) of the slave unit, and the slave microprocessor (6) in the slave unit continuously detects the voltage of the slave energy storage module (5). When the voltage in the slave energy storage module (5) is higher than the set value and the electric energy is relatively sufficient, the slave microprocessor (6) in the slave unit sends a signal to the host unit through the slave RS485 transceiver module (7), indicating that the excess energy can be transmitted to the host. After receiving the signal, the host unit sends a response signal to the slave unit, and the host microprocessor (11) in the host unit and the slave microprocessor (6) in the slave unit respectively control the photocoupler switches in the host unit and the slave unit to close, and the slave unit starts to transmit energy to the host unit, allowing the host unit to store energy. At this time, the two buses are used to transmit energy. When energy is difficult to collect in the environment, such as when there is no wind or at night, the slave microprocessor (6) in a slave unit detects that the voltage of the slave energy storage module (5) in the slave unit is lower than the set value, and the slave unit is at risk of stopping working, the slave microprocessor (6) in the slave unit will send a signal to the host unit through the slave RS485 transceiver module (7), indicating that the host needs to provide power to maintain work. After receiving the signal, the host unit sends a response signal to the slave unit, and the host microprocessor (11) in the host unit and the slave microprocessor (6) in the slave unit respectively control the photocoupler switches in the host unit and the slave unit to close, and the host unit starts to transmit energy to the slave unit to maintain work. When a new slave unit needs to be expanded, it is only necessary to connect the A and B pins of the slave RS485 transceiver module (7) of the slave unit to the A and B buses respectively, and allocate a new address to the slave unit.

[0022] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical scheme and inventive concept of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A dual-bus communication and energy transmission system, comprising a slave unit (1) and a master unit (2), characterized in that The slave unit (1) and the host unit (2) are connected via two buses formed by bus A (3) and bus B (4). The slave unit (1) comprises a slave energy storage module (5), a slave microprocessor (6), a slave RS485 transceiver module (7), and a slave optical coupler switch module (8). The host unit (2) comprises a host optical coupler switch module (9), a host RS485 transceiver module (10), a host microprocessor (11), a DC-DC module (12), and a host energy storage module (13). The slave energy storage module (5) comprises a slave energy storage and a sliding rheostat RP1. The Vcc1 pin and the GND1 pin of the slave energy storage are respectively connected to the sliding rheostat RP1. The movable contact of the sliding rheostat RP1 is connected to the GPIO4 port of the slave microprocessor (6), and provides power for the slave microprocessor (6) and the slave RS485 transceiver module (7), and can store the energy collected by the energy collection device or provide power for the sensor. The RXD port, TXD port, GPIO1 port and GPIO2 port of the slave microprocessor (6) are respectively connected to the RO pin, DI pin, / R / E pin and DE pin of the slave RS485 transceiver module (7). The slave RS485 transceiver module (7) includes a slave RS485 chip and a resistor R1. The two ends of the resistor R1 are respectively connected to the A pin and the B pin of the slave RS485 chip. The slave microprocessor The device (6) will continuously detect the voltage of the slave energy storage module (5) to determine the amount of electric energy stored in the slave energy storage module (5) at this time. If the energy stored in the slave energy storage module (5) reaches a set threshold, the slave microprocessor (6) will send a TTL level request signal to the slave RS485 transceiver module (7), indicating that energy can be transmitted to the host unit (2). The slave RS485 transceiver module (7) converts the received TTL level request signal into a differential request signal and transmits the information to the host RS485 transceiver module (10) in the host unit (2) through the two buses formed by bus A (3) and bus B (4). The host RS485 transceiver module (10) can convert the received differential request signal into a differential request signal. The host RS485 transceiver module (10) comprises a host RS485 chip and a resistor R2, the two ends of the resistor R2 are respectively connected to the A pin and the B pin of the host RS485 chip, the RXD port, the TXD port, the GPIO1 port and the GPIO2 port of the host microprocessor (11) are respectively connected to the RO pin, the DI pin, the / R / E pin and the DE pin of the host RS485 chip, and after receiving the request signal from the slave unit (1), the host microprocessor (11) sends a TTL level response signal to the host RS485 transceiver module (10), indicating that the slave unit (1) is allowed to transmit electric energy to the host unit (2).Then, the host microprocessor (11) controls the host optical coupler switch module (9) to close, wherein the host optical coupler switch module (9) comprises a host optical coupler switch 1 and a host optical coupler switch 2, wherein the IN end of the host optical coupler switch 1 is connected to the IN end of the host optical coupler switch 2 and then connected to the GPIO3 port of the host microprocessor (11), the NO end of the host optical coupler switch 1 is connected to the IO1 end of the DC-DC module (12), the NO end of the host optical coupler switch 2 is connected to the GND end of the DC-DC module (12), the COM end of the host optical coupler switch 1 is connected to the B pin of the host RS485 chip and then connected to the bus B (4), and the COM end of the host optical coupler switch 2 is connected to the A pin of the host RS485 and then connected to the bus A (3); The host RS485 transceiver module (10) converts the received TTL level response signal into a differential response signal and transmits the information to the slave RS485 transceiver module (7) in the slave unit (1) through the two buses formed by bus A (3) and bus B (4). The slave RS485 transceiver module (7) can convert the received differential response signal into a TTL level response signal and transmit it to the slave microprocessor (6). Then the slave microprocessor (6) controls the slave optical coupler switch module (8) to close, and the slave energy storage module (5) starts to transmit the information to the host energy storage module (13) through the slave optical coupler switch module (8), bus A (3), bus B (4), host optical coupler switch module (9) and DC-DC module (12). The slave optocoupler switch module (8) comprises a slave optocoupler switch 1 and a slave optocoupler switch 2, the IN end of the slave optocoupler switch 1 is connected to the IN end of the slave optocoupler switch 2 and then connected to the GPIO3 port of the slave microprocessor (6), the NO end of the slave optocoupler switch 1 is connected to Vcc1, the NO end of the slave optocoupler switch 2 is connected to GND1, the COM end of the slave optocoupler switch 1 is connected to the B pin of the slave RS485 chip and then connected to the bus B (4), the COM end of the slave optocoupler switch 2 is connected to the A pin of the slave RS485 and then connected to the bus A (3); the host energy storage module (13) comprises a host energy storage and a sliding rheostat RP2, the Vcc2 end of the host energy storage is connected to the sliding rheostat One of the fixed contacts of the resistor RP2 is connected to the IO2 end of the DC-DC module (12); the GND2 end of the host energy storage is connected to the other fixed contact of the sliding resistor RP2 and then connected to the GND end of the DC-DC module (12); the moving contact of the sliding resistor RP2 is connected to the GPIO4 port of the host microprocessor (11); the host energy storage module (13) provides power for the host RS485 transceiver module (10) and the host microprocessor (11), and can store electric energy from the slave unit (1) through the DC-DC module (12) or transmit electric energy to the slave through the DC-DC module (12); the DC-DC module (12) can ensure the stability of the electric energy transmission process.If the energy stored in the slave energy storage module (5) is too low, the slave microprocessor (6) will send a TTL level request signal to the slave RS485 transceiver module (7), indicating that the host unit (2) needs to provide power to maintain the normal operation of the slave unit (1). The slave RS485 transceiver module (7) converts the received TTL level request signal into a differential request signal and transmits the information to the host RS485 transceiver module (10) in the host unit (2) through the two buses formed by bus A (3) and bus B (4). The host RS485 transceiver module (10) can convert the received differential request signal into a TTL level request signal and transmit it to the host microprocessor (11). After receiving the request signal from the slave unit (1), the host microprocessor (11) will send a TTL level response signal to the host RS485 transceiver module (10), indicating that it can be operated. The host microprocessor (11) controls the host optical coupler switch module (9) to close, and the host RS485 transceiver module (10) converts the received TTL level response signal into a differential response signal and transmits the information to the slave RS485 transceiver module (7) in the slave unit (1) through the two buses formed by bus A (3) and bus B (4). The slave RS485 transceiver module (7) can convert the received differential response signal into a TTL level response signal and transmit it to the slave microprocessor (6). Then, the slave microprocessor (6) controls the slave optical coupler switch module (8) to close, and the host energy storage module (13) starts to transmit electric energy to the slave energy storage module (5) through the DC-DC module (12), the host optical coupler switch module (9), bus A (3), bus B (4) and the slave optical coupler switch module (8).

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