Exhibition hall multimedia display unit start-stop control system and method

Abstract

The invention discloses an exhibition hall multimedia display unit start-stop control system and method, the system comprises a plurality of electric devices arranged in a small area of an exhibition hall, an online interactive UPS power supply, a master station and a plurality of slave stations, the input end of the online interactive UPS power supply is connected with the commercial power input, the output end of the online interactive UPS power supply is connected with a power supply line, and the slave stations are connected with the power supply line. The master station is connected in parallel between a power supply line and a mains supply input end, and the slave station is connected in series between the power supply line and electric equipment; the master station comprises a master station control board, a voltage and current sensor, a master station input side power supply conversion module, a master station electromagnetic relay, a master station output side power supply conversion module and a master station PLC modem master node. According to the invention, a master-slave control and online interactive UPS power supply is adopted, an independent power-on and power-off control method is provided for a multimedia display unit with power-on and power-off time sequence control requirements, and the problem of orderly starting and stopping of a plurality of devices in a small range of an exhibition hall is solved.

Description

Technical Field

[0001] The invention relates to a control system, and in particular to a start-stop control system and method for a multimedia display unit in an exhibition hall. Background Art

[0002] The current centralized start-stop control method for electrical equipment in exhibition halls mostly uses Ethernet or wireless networks to monitor status and transmit control instructions. This requires a large number of electrical equipment and facilities and is costly.

[0003] If a simpler on-off power supply is used to control the opening or stopping of electrical equipment in the exhibition hall, it is necessary to equip electrical equipment that is prone to malfunction due to non-programmed shutdown with a power-off delay shutdown device. However, the existing power-off delay shutdown device cannot coordinate the power-on and power-off sequence of multiple electrical equipment. Summary of the invention

[0004] The technical problem to be solved by the present invention is to provide a start-stop control system for a multimedia display unit in an exhibition hall which has a reasonable design, rich functions, strong versatility and simple structure in view of the deficiencies in the prior art.

[0005] Another technical problem to be solved by the present invention is to provide a control method with a reasonable design and using the above-mentioned exhibition hall multimedia display unit start-stop control system in view of the deficiencies in the prior art.

[0006] In order to achieve the above object, the present invention adopts the following technical solutions: A start-stop control system for a multimedia display unit in an exhibition hall, wherein the system comprises a plurality of electrical devices arranged in a small area of ​​the exhibition hall, an online interactive UPS power supply, a master station and a plurality of slave stations, wherein the slave stations are arranged in a one-to-one correspondence with the electrical devices, the input end of the online interactive UPS power supply is connected to the mains input, the output end of the online interactive UPS power supply is connected to the power supply line, the master station is connected in parallel between the power supply line and the mains input end, and the slave station is connected in series between the power supply line and the electrical devices; the online interactive UPS power supply, the master station and the slave station constitute a small power supply unit that provides start-stop timing control for a plurality of electrical devices in the small area of ​​the exhibition hall; The master station includes a master station control board, a voltage and current sensor, a master station input side power conversion module, a master station electromagnetic relay, a master station output side power conversion module and a master station power cat master node; The voltage and current sensor and the main station input side power conversion module are arranged on the input side of the online interactive UPS power supply. The voltage and current sensor collects the voltage and current values ​​of the power supply line and outputs them to the main station control board. The main station input side power conversion module converts the city power into direct current of various specifications for use by the main station; the main station control board realizes the data acquisition and logic processing functions; one end of the main station power cat master node is connected to the main station control board with an Ethernet interface, and the other end of the main station power cat master node is connected to the power supply line as the power line communication master node; the main station electromagnetic relay and the main station output side power conversion module are arranged on the output side of the online interactive UPS power supply. The main station electromagnetic relay is also connected to the main station control board and controlled by it to control the output end of the online interactive UPS power supply to output power to the power supply line. The slave station includes a slave station control board, a slave station power conversion module, a slave station electromagnetic relay and a slave station powerline slave node. The slave station control board is provided with an RS232 serial port, a timer and a power switch. The slave station control board is connected to the power line through the slave station power conversion module. One end of the slave powerline slave node is connected to the slave station control board through Ethernet, and the other end of the slave powerline slave node is connected to the power line. The slave powerline slave node is also connected to the slave power conversion module. The slave powerline slave node is connected to the master powerline master node through power line carrier communication technology. The slave electromagnetic relay is connected in series between the electrical equipment and the power line and is connected to the slave control board for power supply control.

[0007] The technical problem to be solved by the present invention can also be achieved through the following technical solution: the power supply line is powered by single-phase alternating current, and the wiring is achieved by using a commercial socket strip or on-site wiring.

[0008] The technical problem to be solved by the present invention can also be achieved through the following technical solution. The online interactive UPS power supply adopts a product with a sinusoidal output waveform, and its capacity is mainly calculated based on the total power of the electrical equipment in the constructed system and the required continuous working time after the AC input power is cut off.

[0009] A method for using the above-mentioned exhibition hall multimedia display unit start-stop control system is characterized in that the method uses an online interactive UPS power supply, a master station, and multiple slave stations to form a small power supply unit. When the mains input is cut off, the power-consuming equipment in the system can still maintain power supply until the power-consuming equipment in the system is shut down according to the normal shutdown process in sequence, and then the power supply of the power supply system is cut off; at the same time, when the mains input changes from power off to power on, the power-consuming equipment in the system can be powered on and started in sequence according to a pre-set power-on sequence, meeting the requirements for the power-on sequence of special power-consuming equipment.

[0010] The technical problem to be solved by the present invention can also be achieved by the following technical solution. The method includes a power supply control mode and a power off control mode. The power supply control mode is that at the input end of the online interactive UPS power supply, the master station monitors the mains input state. If the mains input changes from a power-off state to a power-on state, the master station changes from a shutdown state to a power-on state. After the operation is stable, the output side switch of the online interactive UPS power supply is controlled to close to supply power to the output side power supply line. Then, the master station sends power-on instructions to the slave stations in sequence according to the power-on sequence requirements of the power-consuming equipment. When the power supply line on the output side of the online interactive UPS power supply is powered on, the slave station is powered on first and establishes communication with the master station; when all the slave stations are powered on, the master station sends power-on instructions to the slave stations in sequence according to the power-on sequence of the power-consuming equipment. After receiving the power-on instructions, the slave station closes the power switch of the power-consuming equipment, and the power-consuming equipment is powered on and started automatically; The power-off control mode is that if the mains input changes from the power-on state to the power-off state, the power supply in the system is temporarily provided by the online interactive UPS power supply. The master station sends power-off instructions to the slave stations in the system in sequence according to the power-off sequence requirements of the power-consuming equipment in the system. After waiting for the longest time required for the equipment to shut down normally, the master station cuts off the power supply from the online interactive UPS power supply to the output side power supply line, and the master station itself shuts down due to power failure; When the slave station receives the shutdown command from the master station, it sends the shutdown command to the power-consuming equipment through the RS232 serial port and starts the timer. After waiting for the longest time required for the equipment to shut down normally, the power-consuming equipment is shut down programmatically. When the timer ends, the slave station disconnects the power supply switch of the power-consuming equipment. After all the slave stations have completed all power-off instructions, the master station cuts off the power supply of the online interactive UPS power supply to the output side power supply line, and the slave station shuts down due to power outage.

[0011] The technical problem to be solved by the present invention can also be achieved by the following technical solution. The working process of the master station is: When the mains power changes from a power-off state to a power-on state, the voltage and current sensor on the input side of the master station detects the voltage and current signal and sends the power supply status information to the main station control board; at this time, the main station control board is in a shutdown state, but the power conversion module on the input side of the master station starts working due to the mains power input and supplies power to the main station, so the main station is powered on and the program is started; after the program is started, the main station control board collects the output signal of the voltage and current sensor on the input side of the main station, determines that the mains power is on, and then sends a closing signal to the main station electromagnetic relay on the output side of the online interactive UPS power supply; the main station electromagnetic relay adopts a normally open design and closes the path only after receiving the closing signal; at this time, the output side of the online interactive UPS power supply supplies power to the power supply line; the power conversion module on the output side of the main station and the power conversion module on the input side of the main station simultaneously supply power to the main station; the main station control board establishes contact with the slave node of the slave power cat through the main node of the main station power cat and the power line carrier communication technology, and sends heartbeat messages to each other to determine the status of the slave station; when the status of the slave station is stable, according to the power-on sequence of the slave station, the power-on instructions for the electrical equipment are sent to the slave station in sequence; When the AC power changes from the power-on state to the power-off state, the voltage and current sensors on the input side of the master station cannot detect voltage and current signals that meet the AC power supply specifications, and the power conversion module on the input side of the master station cannot supply power to the master station; at this time, the power of the master station is supplied by the power conversion module on the output side of the master station; the control board of the master station determines that the AC power has been disconnected by collecting the output signal of the voltage and current sensors on the output side of the master station, and then sends power-off instructions to the slave stations in sequence through the main node of the power cat of the master station according to the power-off sequence of each power-consuming device; at the same time, a timer is started to wait for the longest time required for the normal shutdown of the equipment, so as to allow the power-consuming equipment to shut down programmatically; when the timer ends, the control board of the master station actively cuts off the electromagnetic relay of the master station; at this time, the master station cannot obtain power from the power conversion module on the output side of the master station, and the master station shuts down due to power failure.

[0012] The technical problem to be solved by the present invention can also be achieved by the following technical solution. The working process of the slave station is: When the power line changes from a power-off state to a power-on state, the slave power conversion module supplies DC power to the slave control board, the slave is powered on and starts, and establishes communication with the master; when the slave receives the power-on instruction sent by the master to the power-consuming device, the slave control board sends a closing signal to the slave electromagnetic relay; the slave electromagnetic relay adopts a normally open design and closes the circuit only after receiving the closing signal; at this time, the power-consuming device obtains power supply from the power line and starts up automatically; When the slave station receives the shutdown command of the electrical equipment issued by the master station, the slave station control board sends the shutdown command to the electrical equipment through the RS232 serial port and starts the timer at the same time; when the timer ends, the slave station control board cuts off the slave station electromagnetic relay and disconnects the power supply to the electrical equipment; when the power supply line changes from the power-on state to the power-off state, the slave station shuts down due to power failure.

[0013] Compared with the prior art, the present invention has the following technical effects: First, the present invention uses power carrier communication to build communication between the master station and the slave station. In practical applications, there is no need to build external communication facilities. The power transmission line is directly used as the transmission medium. The power supply and signal transmission are integrated, which is easy to install and use. Because the amount of data transmitted is extremely small, the communication quality requirements of power carrier communication are not high, and it is suitable for complex and changeable field environments; Second, the present invention can automatically control the startup and shutdown timing of multiple electrical devices in the system only according to the power supply status, without the need for manual control of multiple devices to issue startup or shutdown instructions, thereby improving usage efficiency.

[0014] The present invention adopts a small power supply unit with master-slave control function, which cooperates with a universal online interactive UPS power supply to provide an independent power on and off control method for a multimedia display unit with power on and off timing control requirements, thereby solving the problem of orderly starting and stopping of multiple devices in a small area of ​​the exhibition hall without almost changing the on-site equipment and facilities and the current power on and off control logic. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 This is a structural principle diagram of the start-stop control system of the exhibition hall multimedia display unit of the present invention; Figure 2 This is the principle block diagram of the main station; Figure 3 This is a block diagram of the composition principle of the slave station. DETAILED DESCRIPTION

[0016] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0017] Reference Figure 1 A start-stop control system for a multimedia display unit in an exhibition hall. The system uses an online interactive UPS power supply, a master station, and multiple slave stations to form a small power supply system. When the mains input is cut off, the equipment in the system can still maintain power supply until the equipment in the system shuts down in a normal shutdown process in sequence, and then the power supply of the power supply system is cut off. At the same time, when the mains input changes from power off to power on, the equipment in the system can be powered on and started in sequence according to the pre-set power-on sequence, meeting the requirements for the power-on sequence of special equipment.

[0018] The online interactive UPS power supply uses a product with a sinusoidal output waveform. Its capacity is mainly calculated based on the total power of the equipment in the constructed system and the required continuous working time after the AC input power is cut off.

[0019] The master station is used in conjunction with the online interactive UPS power supply. At the input end of the online interactive UPS power supply, the master station monitors the mains input status. If the mains input changes from the power-off state to the power-on state, the master station changes from the shutdown state to the power-on state. After the operation is stable, the output side switch of the online interactive UPS power supply is controlled to close and supply power to the output side power supply line. Then, the master station sends power-on instructions to the slave stations in the system in turn according to the power-on sequence requirements of the equipment in the system. If the mains input changes from the power-on state to the power-off state, the power supply in the system is temporarily provided by the online interactive UPS power supply. The master station sends power-off instructions to the slave stations in the system in turn according to the power-off sequence requirements of the equipment in the system. After waiting for a long enough time (generally no more than 10 minutes), the master station cuts off the power supply from the online interactive UPS power supply to the output side power supply line, and the master station itself shuts down due to power failure.

[0020] The slave station is used in conjunction with the online interactive UPS power supply and the master station. Ordinary socket strips are used for lead-out wiring at the output end of the UPS power supply, and the slave station is connected in series between the power-consuming device and the socket strip. When the power supply line on the output side of the UPS power supply is powered on, the slave station is powered on first and establishes communication with the master station. When all slave stations are powered on, the master station sends power-on instructions to the slave stations in sequence according to the power-on sequence of the devices. After receiving the power-on instruction, the slave station closes the power switch of the device, and the device is powered on and automatically starts. When the slave station receives the shutdown command sent by the master station, the slave station sends a shutdown command to the device through the RS232 serial port, starts the timer, and waits for a long enough time (generally no more than 5 minutes) for the device to be programmed to shut down. When the timer ends, the slave station disconnects the power switch of the device. When the master station cuts off the power supply from the online interactive UPS power supply to the output side power supply line, the slave station shuts down due to power failure.

[0021] Reference Figure 2 On the input side of the online interactive UPS power supply, the master station is equipped with a master station voltage and current sensor and a master station input side power conversion module. The master station voltage and current sensor collects the voltage and current values ​​of the power supply line and outputs them to the master station control board. The master station input side power conversion module converts the mains power into DC power of various specifications for use by the modules in the master station. The master station control board implements data acquisition and logic processing functions. One end of the power cat master node is connected to the main station control board with an Ethernet interface, and the other end is connected to the power line as the main node of power line communication. On the output side of the online interactive UPS power supply, a master station electromagnetic relay controlled by the main control board is set to control the output end of the online interactive UPS power supply to output power to the power line. The master station output side power conversion module realizes that when the mains power supply is cut off, the master station can still obtain the DC power supply required for work from the master station output side power conversion module until the master station electromagnetic relay on the output side is actively cut off by the master station control board.

[0022] When the mains power changes from a power-off state to a power-on state, the voltage and current sensor of the master station on the input side of the online interactive UPS power supply detects the voltage and current signal and sends data to the main control board. At this time, the main control board is in the shutdown state, but the power conversion module on the input side of the master station starts working due to the mains power input and supplies power to the master station. Therefore, the master station is powered on and the program is started. After the program is started, the master station collects the output signal of the voltage and current sensor of the master station, determines that the mains power is on, and sends a closing signal to the electromagnetic relay on the output side of the online interactive UPS power supply. The electromagnetic relay adopts a normally open design and closes the path only after receiving a closing signal. At this time, the output side of the online interactive UPS power supply supplies power to the power supply line. The power conversion module on the output side of the master station and the power conversion module on the input side of the master station simultaneously supply power to the master station. The master station establishes contact with the slave node of the slave power cat through the master node of the master station power cat through the power line carrier communication technology, and sends heartbeat messages to each other to determine the status of the slave station. When the status of the slave station is stable, the device power-on command is sent to the slave station in sequence according to the power-on sequence of the slave station.

[0023] When the mains power changes from the power-on state to the power-off state, the main station voltage and current sensor on the input side of the online interactive UPS power supply cannot detect the voltage and current signal that meets the mains power supply specifications, and the main station input side power conversion module cannot supply power to the main station. At this time, the power of the main station is supplied by the power conversion module on the output side of the main station. The main station determines that the mains power has been disconnected by collecting the output signal of the main station voltage and current sensor, and then sends the device shutdown command to the slave station in sequence according to the power-off sequence of each device through the main station power cat master node. At the same time, a timer is started to wait for a long enough time for the device to be programmed to shut down. When the timer ends, the main station actively cuts off the main station electromagnetic relay. At this time, the main station cannot obtain power from the power conversion module on the output side of the main station, and the main station shuts down due to power failure.

[0024] Reference Figure 3 The slave station obtains power supply from the power supply line through the slave station power conversion module. The slave station power conversion module converts the mains power into DC power of various specifications for the slave station to work. One end of the powerline cat slave node is connected to the slave station control board through Ethernet, and the other end is connected to the power line. The communication link is established with the master station powerline cat master node through power line carrier communication technology, and heartbeat messages are sent to each other to confirm the status. The slave station control board and the power-consuming equipment are interconnected through RS232 serial port lines, supporting two-way data transmission.

[0025] When the power line changes from a power-off state to a power-on state, the slave power conversion module supplies DC power to the slave. The slave is powered on and starts, and establishes communication with the master. When the slave receives the device power-on command sent by the master, the slave control board sends a closing signal to the slave electromagnetic relay. The electromagnetic relay is designed to be normally open, and the circuit is closed only after receiving the closing signal. At this time, the electrical equipment obtains power supply from the power line and starts up automatically.

[0026] When the slave receives the shutdown command from the master, the slave control board sends the shutdown command to the power-consuming device through the serial port line and starts the timer. When the timer ends, the slave control board cuts off the electromagnetic relay and disconnects the power supply to the power-consuming device. When the power line changes from the power-on state to the power-off state, the slave shuts down due to power failure.

[0027] The present invention uses a main control board with data processing and logic analysis capabilities and a wired or wireless communication module to achieve full automation of data transmission, signal transmission, signal detection, result collection, and logic judgment; a display touch screen is used to display the test results. An interface conversion board is used to adapt to connectors of various models and specifications; only one wiring is required at the signal transmission end and one wiring is required at the signal detection end to achieve full automatic testing and display test results, which greatly simplifies the operation steps, saves test time, and improves test efficiency.

[0028] The present invention can be based on the commonly used online interactive UPS power supply and standard socket strip on the market, using a dedicated master station and slave station to realize the start and stop timing control of multiple devices in a small system. It has a simple structure and strong versatility, and no special modification of electrical equipment is required. The system of the present invention provides a safe and reliable timing start and stop control solution for multiple devices in a small area of ​​the exhibition hall, and has the characteristics of rich functions, strong versatility and simple structure.

[0029] 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 start-stop control system for a multimedia display unit in an exhibition hall, characterized in that: The system includes a plurality of electrical appliances arranged in a small exhibition hall area, an online interactive UPS power supply, a master station and a plurality of slave stations, the slave stations are arranged in a one-to-one correspondence with the electrical appliances, the input end of the online interactive UPS power supply is connected to the mains input, the output end of the online interactive UPS power supply is connected to the power supply line, the master station and the online interactive UPS power supply are connected in parallel between the power supply line and the mains input end, and the slave stations are connected in series between the power supply line and the electrical appliances; the online interactive UPS power supply, the master station and the slave stations constitute a small power supply unit that provides start-stop timing control for a plurality of electrical appliances in the small exhibition hall area; The master station includes a master station control board, a voltage and current sensor, a master station input side power conversion module, a master station electromagnetic relay, a master station output side power conversion module and a master station power cat master node; The voltage and current sensor and the main station input side power conversion module are arranged on the input side of the online interactive UPS power supply. The voltage and current sensor collects the voltage and current values ​​of the power supply line and outputs them to the main station control board. The main station input side power conversion module converts the city power into direct current of various specifications for use by the main station; the main station control board realizes the data acquisition and logic processing functions; one end of the main station power cat master node is connected to the main station control board with an Ethernet interface, and the other end of the main station power cat master node is connected to the power supply line as the power line communication master node; the main station electromagnetic relay and the main station output side power conversion module are arranged on the output side of the online interactive UPS power supply. The main station electromagnetic relay is also connected to the main station control board and controlled by it to control the output end of the online interactive UPS power supply to output power to the power supply line. The slave station includes a slave station control board, a slave station power conversion module, a slave station electromagnetic relay and a slave station powerline slave node. The slave station control board is provided with an RS232 serial port, a timer and a power switch. The slave station control board is connected to the power line through the slave station power conversion module. One end of the slave powerline slave node is connected to the slave station control board through Ethernet, and the other end of the slave powerline slave node is connected to the power line. The slave powerline slave node is also connected to the slave power conversion module. The slave powerline slave node is connected to the master powerline master node through power line carrier communication technology. The slave electromagnetic relay is connected in series between the electrical equipment and the power line and is connected to the slave control board for power supply control.

2. The start-stop control system of the exhibition hall multimedia display unit according to claim 1, characterized in that: The power supply line is powered by single-phase alternating current, and wiring is achieved by using commercial socket strips or on-site wiring.

3. The start-stop control system of the exhibition hall multimedia display unit according to claim 1, characterized in that: The online interactive UPS power supply adopts a product with a sinusoidal output waveform, and its capacity is mainly calculated based on the total power of the electrical equipment in the constructed system and the required continuous working time after the mains input power is cut off.

4. A method for using the start-stop control system of the exhibition hall multimedia display unit according to any one of claims 1 to 3, characterized in that: The method is to use an online interactive UPS power supply, a master station, and multiple slave stations to form a small power supply unit. When the mains input is cut off, the electrical equipment in the system can still maintain power supply until the electrical equipment in the system is shut down according to the normal shutdown process in sequence, and then the power supply of the power supply system is cut off; at the same time, when the mains input changes from power off to power on, the electrical equipment in the system can be powered on and started in sequence according to the pre-set power-on sequence, meeting the requirements for the power-on sequence of special electrical equipment.

5. The method according to claim 4, characterized in that The method includes a power supply control mode and a power off control mode. The power supply control mode is that at the input end of the online interactive UPS power supply, the master station monitors the mains input state. If the mains input changes from a power-off state to a power-on state, the master station changes from a shutdown state to a power-on state. After the operation is stable, the output side switch of the online interactive UPS power supply is controlled to close to supply power to the output side power supply line. Then, the master station sends power-on instructions to the slave stations in sequence according to the power-on sequence requirements of the power-consuming equipment. When the power supply line on the output side of the online interactive UPS is powered on, the slave station is powered on first and establishes communication with the master station; When all slave stations are powered on, the master station sends power-on instructions to the slave stations in sequence according to the power-on sequence of the power-consuming equipment. After receiving the power-on instructions, the slave stations close the power switches of the power-consuming equipment, and the power-on of the power-consuming equipment starts automatically; The power-off control mode is that if the mains input changes from the power-on state to the power-off state, the power supply in the system is temporarily provided by the online interactive UPS power supply. The master station sends power-off instructions to the slave stations in the system in sequence according to the power-off sequence requirements of the power-consuming equipment in the system. After waiting for the longest time required for the equipment to shut down normally, the master station cuts off the power supply from the online interactive UPS power supply to the output side power supply line, and the master station itself shuts down due to power failure; When the slave station receives the shutdown command from the master station, it sends the shutdown command to the power-consuming equipment through the RS232 serial port and starts the timer. After waiting for the longest time required for the equipment to shut down normally, the power-consuming equipment is shut down programmatically. When the timer ends, the slave station disconnects the power supply switch of the power-consuming equipment. After all the slave stations have completed all power-off instructions, the master station cuts off the power supply of the online interactive UPS power supply to the output side power supply line, and the slave station shuts down due to power outage.

6. The method according to claim 4, characterized in that The working process of the master station is as follows: when the mains power changes from a power-off state to a power-on state, the voltage and current sensor on the input side of the master station detects the voltage and current signal and sends the power supply status information to the control board of the master station; at this time, the control board of the master station is in a shutdown state, but the power conversion module on the input side of the master station starts working due to the mains power input and supplies power to the master station, so the master station is powered on and the program is started; after the program is started, the control board of the master station collects the output signal of the voltage and current sensor on the input side of the master station, determines that the mains power is on, and then sends a closing signal to the electromagnetic relay of the master station on the output side of the online interactive UPS power supply; the electromagnetic relay of the master station adopts a normally open design and closes the path only after receiving the closing signal; at this time, the output side of the online interactive UPS power supply supplies power to the power supply line; the power conversion module on the output side of the master station and the power conversion module on the input side of the master station simultaneously supply power to the master station; the control board of the master station establishes contact with the slave node of the slave power cat through the master node of the master station power cat and the power line carrier communication technology, and sends heartbeat messages to each other to determine the status of the slave station; When the slave status is stable, the power-on instructions for the electrical equipment are sent to the slaves in sequence according to the power-on sequence of the slaves; When the AC power changes from the power-on state to the power-off state, the voltage and current sensors on the input side of the master station cannot detect voltage and current signals that meet the AC power supply specifications, and the power conversion module on the input side of the master station cannot supply power to the master station; at this time, the power of the master station is supplied by the power conversion module on the output side of the master station; the control board of the master station determines that the AC power has been disconnected by collecting the output signal of the voltage and current sensors on the input side of the master station, and then sends power-off instructions to the slave stations in sequence through the main node of the power cat of the master station according to the power-off sequence of each power-consuming device; at the same time, a timer is started to wait for the longest time required for the equipment to shut down normally, so as to allow the power-consuming equipment to shut down programmatically; when the timer ends, the control board of the master station actively cuts off the electromagnetic relay of the master station; at this time, the master station cannot obtain power from the power conversion module on the output side of the master station, and the master station shuts down due to power failure.

7. The method according to claim 4, characterized in that The working process of the slave station is as follows: when the power supply line changes from a power-off state to a power-on state, the slave station power conversion module supplies direct current to the slave station control board, the slave station is powered on and starts, and establishes communication with the master station; When the slave station receives the power-on instruction of the electrical equipment sent by the master station, the slave station control board sends a closing signal to the slave station electromagnetic relay; The slave electromagnetic relay adopts a normally open design and closes the circuit only after receiving a closing signal; At this time, the electrical equipment obtains power from the power supply line and starts up automatically; When the slave station receives the shutdown command of the electrical equipment issued by the master station, the slave station control board sends the shutdown command to the electrical equipment through the RS232 serial port and starts the timer at the same time; when the timer ends, the slave station control board cuts off the slave station electromagnetic relay and disconnects the power supply to the electrical equipment; when the power supply line changes from the power-on state to the power-off state, the slave station shuts down due to power failure.

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