CN111601414A - PLC intelligent lamp control method, PLC gateway, PLC lamp and system - Google Patents
PLC intelligent lamp control method, PLC gateway, PLC lamp and system Download PDFInfo
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B45/00—Circuit arrangements for operating light-emitting diodes [LED]
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- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
- G05B19/00—Programme-control systems
- G05B19/02—Programme-control systems electric
- G05B19/418—Total factory control, i.e. centrally controlling a plurality of machines, e.g. direct or distributed numerical control [DNC], flexible manufacturing systems [FMS], integrated manufacturing systems [IMS] or computer integrated manufacturing [CIM]
- G05B19/4185—Total factory control, i.e. centrally controlling a plurality of machines, e.g. direct or distributed numerical control [DNC], flexible manufacturing systems [FMS], integrated manufacturing systems [IMS] or computer integrated manufacturing [CIM] characterised by the network communication
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L12/00—Data switching networks
- H04L12/66—Arrangements for connecting between networks having differing types of switching systems, e.g. gateways
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B45/00—Circuit arrangements for operating light-emitting diodes [LED]
- H05B45/10—Controlling the intensity of the light
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B45/00—Circuit arrangements for operating light-emitting diodes [LED]
- H05B45/30—Driver circuits
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- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B20/00—Energy efficient lighting technologies, e.g. halogen lamps or gas discharge lamps
- Y02B20/40—Control techniques providing energy savings, e.g. smart controller or presence detection
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P90/00—Enabling technologies with a potential contribution to greenhouse gas [GHG] emissions mitigation
- Y02P90/02—Total factory control, e.g. smart factories, flexible manufacturing systems [FMS] or integrated manufacturing systems [IMS]
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Abstract
According to the PLC intelligent lamp control method, the PLC gateway, the PLC lamp and the system, the lamp control instruction containing the information of the current communication frequency band is issued to one or more PLC lamps connected in the PLC local area network where the PLC gateway is located; judging whether response responses which are returned by the PLC lamps and represent that the lamp control instructions are received within a preset time threshold; if yes, keeping the current communication frequency band unchanged; if not, switching to the next adjacent communication frequency band and executing the steps from the beginning. According to the LED driving power supply, the EMI filter in the LED driving power supply can be effectively inhibited from filtering the PLC communication signals, the PLC communication signal-to-noise ratio is improved to the maximum extent, the number of nodes of the PLC lamp capable of being networked is increased, the networking speed of the PLC lamp is accelerated, the network stability of the PLC lamp after networking is improved, the response speed of the PLC lamp to the lamp control command is accelerated, and the consistency of the response action of the PLC lamp to the lamp control command is improved.
Description
Technical Field
The application relates to the field of application of a power line carrier communication technology to indoor intelligent lighting control, in particular to a PLC intelligent lamp control method, a PLC gateway, a PLC lamp and a system.
Background
The broadband power line carrier communication technology (called broadband PLC for short) refers to a power line carrier communication technology with a signal carrier frequency of 1-30MHz, the frequency band effectively avoids the conventional low-frequency interference of a kilohertz frequency band, and the megametric data transmission is realized by adopting an orthogonal or spread spectrum modulation mode. .
Theoretically, the lower the PLC communication frequency band is, the smaller the transmission loss is and the longer the communication signal coverage is; and the higher the PLC communication frequency band is, the faster the communication speed is and the more the communication data volume is. In the management of PLC electric power meter reading business, because the electric power environment is different, so in the different power consumption platform districts in same region, adopt the mode of appointed frequency channel to avoid the PLC signal interference and the crosstalk between the platform interval, for example: the cell a operates in a fixed frequency band a, the adjacent cell B operates in a fixed frequency band B, and so on.
The broadband PLC technology is superior to a wireless communication technology in many technical layers, and avoids the trouble that a special communication line must be laid in the traditional wired communication technology, so that the broadband PLC technology is applied to the fields of intelligent home, indoor intelligent lighting control and the like, and is a technological development trend in recent years.
Different from widely applied PLC electric meter reading systems, the indoor PLC intelligent lamp control system is a technical application started recently, and a plurality of problems still exist, and the problems mainly comprise:
(1) the number of nodes of the PLC lamps capable of being networked is as follows: an LED driving power supply in a PLC lamp belongs to power electronic equipment, and electromagnetic noise can be introduced to a power line by high-frequency harmonic waves in the LED driving power supply. In an illumination field, the more lamps which work simultaneously, the higher the background noise of the power line is gathered, and the lower the signal-to-noise ratio (SNR) of PLC communication and the receiving sensitivity of PLC signals are, so that the number of nodes which can be networked by the PLC lamps is limited.
(2) The network access speed of the PLC lamp is as follows: the reason is the same as above, the LED driving power supply introduces electromagnetic noise, reduces the receiving sensitivity of the PLC single lamp controller to the PLC signal, and reduces the networking speed of the lamp.
(3) Network stability after the PLC lamps are connected into the network: the networked PLC lamps may interrupt communication with the PLC gateway due to too low signal-to-noise ratio, so that the networked PLC lamp nodes are disconnected from the network and offline.
(4) Response speed of the PLC lamp to the lamp control instruction is as follows: the PLC lamps after being connected to the network have slow response to the lamp control instruction due to low receiving sensitivity to PLC signals, so that the response speed is obviously delayed.
(5) The consistency of the response action of the PLC lamp to the lamp control command is as follows: because the response delay time of a plurality of PLC lamps after the network access to the lamp control instruction is different, the consistency of the on-site lamp action pace is poor, and the typical phenomena are as follows: the response to the "all on/all off together" light control command appears as "full on/all off with wadding".
Disclosure of Invention
In view of the above-mentioned shortcomings of the prior art, an object of the present application is to provide a PLC intelligent lamp control method, a PLC gateway, a PLC lamp, and a system, so as to solve at least one problem in the prior art.
In order to achieve the above and other related objects, the present application provides a PLC intelligent lamp control method applied to a PLC gateway, the method including: sending a lamp control instruction containing information of the current communication frequency band to one or more PLC lamps connected in a PLC local area network where a PLC gateway is located; judging whether response responses representing that the lamp control instructions are received and returned by the PLC lamps are received within a preset time threshold value; if yes, keeping the current communication frequency band unchanged; and if not, switching to the next adjacent communication frequency band and executing the steps from the beginning until response responses returned by the PLC lamps are received within a preset time threshold.
In an embodiment of the present application, the switching to the adjacent next communication frequency band is: a range of carrier frequencies is automatically increased as the next communication band.
In an embodiment of the present application, the light control command includes: the control system comprises a single lamp control instruction for any one PLC lamp and a batch lamp control instruction for at least two PLC lamps.
In an embodiment of the present application, the light control command includes: any one or more of switching action, brightness adjustment and color temperature adjustment.
In order to achieve the above and other related objects, the present application provides a PLC intelligent lamp control method applied to a PLC lamp, the method including: receiving a lamp control instruction which contains information of a current communication frequency band and is sent by a PLC gateway connected in a PLC local area network where a PLC lamp is located; and sending a response representing that the lamp control instruction is received back to the PLC gateway, and adjusting the modulation frequency band to the communication frequency band contained in the lamp control instruction so as to demodulate the signal of the lamp control instruction and execute corresponding control action.
To achieve the above and other related objects, the present application provides a PLC gateway, including: a memory, a processor, and a communicator; the memory is to store computer instructions; the processor executes the computer instructions to implement the method applied to the PLC gateway as described above; the communicator is used for being in communication connection with the PLC lamp, the server and the control panel.
To achieve the above and other related objects, the present application provides a PLC lamp including: the LED driving system comprises a PLC single lamp controller, an LED driving power supply and an LED light source; the PLC single lamp controller includes: a memory, a processor, and a communicator; the memory is to store computer instructions; the processor runs the computer instructions to implement the method applied to the PLC lamp as described above; the communicator is used for being in communication connection with the PLC gateway.
In an embodiment of the present application, the LED driving power source includes: an EMI filter, and a power converter.
To achieve the above and other related objects, the present application provides a PLC intelligent lamp control system, which includes: a PLC gateway as described above, and one or more PLC light fixtures as described above: the PLC gateway and each PLC lamp belong to a PLC local area network; the PLC gateway is used for issuing lamp control instructions to each PLC lamp.
In an embodiment of the application, the PLC gateway is in communication connection with a server, so as to remotely receive a lamp control instruction issued by a terminal or a cloud; and/or the PLC gateway is in communication connection with the PLC panel and is used for directly receiving the lamp control command in the lighting field.
In summary, according to the PLC intelligent lamp control method, the PLC gateway, the PLC lamp, and the PLC system of the present application, a lamp control instruction including information of a current communication frequency band is issued to one or more PLC lamps connected in a PLC lan where the PLC gateway is located; judging whether response responses representing that the lamp control instructions are received and returned by the PLC lamps are received within a preset time threshold value; if yes, keeping the current communication frequency band unchanged; and if not, switching to the next adjacent communication frequency band and executing the steps from the beginning until response responses returned by the PLC lamps are received within a preset time threshold.
Has the following beneficial effects:
according to the LED driving power supply, the EMI filter in the LED driving power supply can be effectively inhibited from filtering the PLC communication signals, the PLC communication signal-to-noise ratio is improved to the maximum extent, the number of nodes of the PLC lamp capable of being networked is increased, the networking speed of the PLC lamp is accelerated, the network stability of the PLC lamp after networking is improved, the response speed of the PLC lamp to the lamp control command is accelerated, and the consistency of the response action of the PLC lamp to the lamp control command is improved.
Drawings
Fig. 1 is a schematic view of a scene of a PLC intelligent lamp control system according to an embodiment of the present disclosure.
Fig. 2 is a flowchart illustrating a PLC intelligent lamp control method applied to a PLC gateway according to an embodiment of the present invention.
Fig. 3 is a schematic flowchart illustrating a PLC intelligent lamp control method applied to a PLC lamp according to an embodiment of the present disclosure.
Fig. 4 is a schematic structural diagram of a PLC gateway in an embodiment of the present application.
Fig. 5 is a schematic structural diagram of a PLC lamp according to an embodiment of the present disclosure.
Fig. 6 is a network topology diagram of nodes in the PLC intelligent light control system operating in a fixed communication band according to an embodiment of the present invention.
Fig. 7 is a network topology diagram of nodes in the PLC intelligent light control system operating in an adaptive communication band according to an embodiment of the present invention.
Detailed Description
The following description of the embodiments of the present application is provided by way of specific examples, and other advantages and effects of the present application will be readily apparent to those skilled in the art from the disclosure herein. The present application is capable of other and different embodiments and its several details are capable of modifications and/or changes in various respects, all without departing from the spirit of the present application. It is to be noted that the features in the following embodiments and examples may be combined with each other without conflict.
It should be noted that the drawings provided in the following embodiments are only schematic and illustrate the basic idea of the present application, and although the drawings only show the components related to the present application and are not drawn according to the number, shape and size of the components in actual implementation, the type, quantity and proportion of the components in actual implementation may be changed at will, and the layout of the components may be more complex.
Although there are many communication and sharing points in communication technology, the PLC electric power meter reading and the PLC intelligent lamp control belong to different application fields, have respective service characteristics and technical index requirements, and the main difference is listed in Table 1.
TABLE 1PLC electric power meter reading system and service characteristics thereof, and PLC intelligent lamp control system and service characteristics thereof
As shown in the above table, unlike the widely used PLC power meter reading system, the indoor PLC intelligent lamp control system is a technical application started recently, and has many problems.
In the PLC lamp control system, it is the main problem to be solved by the present application how to increase the number of nodes that the PLC lamp can be networked, increase the network access speed of the PLC lamp, improve the network stability after the PLC lamp is networked, increase the response speed of the PLC lamp to the lamp control command, and improve the consistency of the response action of the PLC lamp to the lamp control command. In order to solve at least one problem, the application provides a PLC intelligent lamp control method, a PLC gateway, a PLC lamp and a system.
Fig. 1 is a schematic view showing a scene of the PLC intelligent lamp control system according to an embodiment of the present invention. As shown, the system comprises: a PLC gateway 110, one or more PLC light fixtures 120.
The PLC lamp 120 is added into a PLC local area network initiated by a PLC gateway 110, and the PLC gateway 110 and each PLC lamp 120 belong to the same PLC local area network; the PLC gateway is used for issuing lamp control instructions to each PLC lamp.
In addition, the PLC gateway 110 may further be in communication connection with the server 130, so as to be used for remotely receiving a lamp control instruction issued by a terminal or a cloud. For example, a user may log in the management and control platform 131 using a suitable human-computer interface (e.g., mobile phone, computer) of the client 132, and then control one or more PLC lighting fixtures 120 through the server 130 and the PLC gateway 110; the client 132 may include an APP management application or a mobile applet installed, and a user may remotely interact with the PLC gateway 110 to control one or more PLC luminaires 120 through the APP management application or the mobile applet.
Secondly, the PLC gateway 110 may also be communicatively connected to the PLC panel 140 for directly receiving the lamp control command. For example, a user may interact directly with the PLC gateway 110 to control one or more PLC light fixtures 120 through a separate or integrated PLC panel 140 disposed on a wall.
It should be noted that, the source of the problem existing in the indoor PLC intelligent lamp control system can be simply summarized as "signal-to-noise ratio on the power line", that is, the ratio between the PLC signal intensity and the electromagnetic noise intensity on the power line, and as long as the PLC communication signal-to-noise ratio is increased, the performance of the PLC intelligent lamp control system in aspects such as lamp networking, lamp control, and the like can be improved. In order to solve the above problems, in the PLC intelligent lamp control method according to the present application, different strategies for allocating a fixed frequency band in the application of the PLC meter reading system are introduced: namely, a strategy of adaptively adjusting a communication frequency band is introduced into a PLC gateway and a PLC lamp.
Fig. 2 is a schematic flowchart illustrating a PLC intelligent light control method applied to a PLC gateway according to an embodiment of the present invention. As shown, the method is applied to a PLC gateway, and includes:
s201: and issuing a lamp control instruction containing the information of the current communication frequency band to one or more PLC lamps connected in a PLC local area network where the PLC gateway is located.
In this embodiment, after the PLC intelligent lamp control system shown in fig. 1 is powered on, the PLC gateway first operates in the default communication frequency band. Preferably, the default communication frequency band is a low frequency band, and generally, the low frequency band has a small transmission loss and a long communication signal coverage.
In this embodiment, after the PLC gateway is powered on to operate, the PLC gateway may issue a lamp control instruction to one or more PLC lamps in the PLC lan where the PLC gateway is located, where the lamp control instruction includes information of a current communication frequency band, such as a default communication frequency band at the beginning. And the PLC gateway issues a lamp control instruction and simultaneously prepares to receive a response returned by the PLC lamp.
S202: and judging whether response responses representing that the lamp control instructions are received in preset time thresholds or not, wherein the response responses are returned by the PLC lamps.
In this embodiment, since harmful electromagnetic noise on the power line is too complex, sometimes beneficial PLC signals are also suppressed, and electromagnetic interference introduced by the LED power source on the power line may reduce the PLC communication signal-to-noise ratio, at this time, the communication frequency band is not suitable. Therefore, a time threshold is added in the method to judge the response which is returned by each PLC lamp and represents that the lamp control instruction is received, so that whether the current communication frequency band is proper or not is determined.
S203: if yes, keeping the current communication frequency band unchanged; if not, switching to the next adjacent communication frequency band and executing the steps from the beginning (re-executing S201-S202) until response responses returned by the PLC lamps are received within a preset time threshold.
In this embodiment, if the PLC gateway can receive a correct response from the PLC lamp within the set time threshold, it indicates that the current communication frequency band is suitable, and the communication frequency band is kept unchanged; if the PLC gateway cannot receive the correct response of the PLC lamp within the set time threshold, the fact that harmful electromagnetic noise on a power line is too complex and beneficial PLC signals are suppressed in the current working communication frequency band indicates that the communication frequency band is not suitable, and then the PLC gateway and the PLC lamp are automatically switched to the next adjacent communication frequency band.
Specifically, the switching to the adjacent next communication band is: a range of carrier frequencies is automatically increased as the next communication band. The PLC communication frequency substantially refers to a carrier frequency of the PLC signal, i.e., a modulation frequency. The carrier signal is produced by the high frequency modulation circuit in the PLC chip, and the modulation frequency can be adjusted according to the tactics automatically, like this patent, the technical principle is: increasing the frequency of the output signal of the high frequency modulation line to a certain frequency band enables the switching to the next adjacent communication frequency band as described in this application.
Generally, the carrier frequency band (i.e. communication band) of the wideband PLC is within 1-30MHz, and can be divided into many small bands, such as band 1: 1-3 MHz; frequency band 2: 4-6 MHz; frequency band 3: 7-9MHz, and so on. Switching to the adjacent next communication band may refer to: and switching from the Kth frequency band to the K +1 th frequency band.
In addition, the switching of the frequency band can be designed in advance on the communication protocol and the control strategy, for example, the specific switching process can be automatically implemented through a chip or a processor in the PLC gateway.
In an embodiment of the present application, the light control command includes: the control system comprises a single lamp control instruction for any one PLC lamp and a batch lamp control instruction for at least two PLC lamps. Additionally, the light control instructions include, but are not limited to, the common: any one or more of switching action, brightness adjustment and color temperature adjustment.
Fig. 3 is a schematic flow chart of a PLC intelligent lamp control method applied to a PLC lamp according to an embodiment of the present invention. As shown, the method is applied to a PLC light fixture, including:
s301: and receiving a lamp control instruction which contains information of the current communication frequency band and is sent by a PLC gateway connected in a PLC local area network where the PLC lamp is located. That is, the light control instruction including the information of the current communication frequency band is issued to one or more PLC light fixtures connected in the PLC lan where the PLC gateway is located, corresponding to step S201 in fig. 2.
S302: and sending a response representing that the lamp control instruction is received back to the PLC gateway, and adjusting the modulation frequency band to the communication frequency band contained in the lamp control instruction so as to demodulate the signal of the lamp control instruction and execute corresponding control action.
In this embodiment, the PLC intelligent lamp control method applied to the PLC lamp is adapted to the PLC intelligent lamp control method applied to the PLC gateway. After receiving the lamp control command signal of the PLC gateway, the PLC module in the PLC lamp, in addition to sending back a response, may also automatically adjust its own carrier frequency to ensure correct signal demodulation, and if adjusting its own carrier frequency may be automatically implemented by a chip or a processor in the PLC gateway.
In an actual scene, the PLC lamp may continuously receive a plurality of lamp control commands including information of different communication frequency bands, and after receiving the lamp control command each time, the PLC lamp executes the task according to S302, that is, sends back a response indicating that the lamp control command is received, and simultaneously adjusts the modulation frequency band to the communication frequency band included in the lamp control command to demodulate the signal of the lamp control command and execute a corresponding control action. If the demodulation is not completed and the lamp control command including the new communication frequency band is received, the PLC lamp may directly re-execute step S302, i.e., the complete process can be always implemented with the latest communication frequency band, and the corresponding control action of the last lamp control command is executed.
Fig. 4 is a schematic structural diagram of a PLC gateway according to an embodiment of the present invention. As shown, the PLC gateway 400 includes: a memory 401, a processor 402, and a communicator 403; the memory 401 is used for storing computer instructions; the processor 402 executes computer instructions to implement the method described in FIG. 2; the communicator 403 is used for connecting to the PLC lamp 500, the server, and the control panel in communication as described in fig. 5.
That is, the PLC gateway 400 may be in communication connection with a server, so as to be used for remotely receiving a lamp control instruction issued by a terminal or a cloud. For example, a user may log in the management and control platform by using a suitable human-machine interface (e.g., a mobile phone or a computer) of the client, and then control one or more PLC lighting fixtures 500 through the server and the PLC gateway 400; wherein, the customer end can be including installing APP management application or cell-phone applet, and the user passes through APP management application or cell-phone applet can be long-range to realize controlling one or more PLC lamps and lanterns 500 with PLC gateway 400 interaction. In addition, the PLC gateway 400 may also be communicatively connected to a PLC panel for directly receiving the light control command. For example, a user may interact directly with the PLC gateway 400 to control one or more PLC light fixtures 500 through a separate or integrated PLC panel disposed on a wall.
In some embodiments, the number of the memory 401 in the PLC gateway 400 may be one or more, the number of the processor 402 may be one or more, the number of the communicator 403 may be one or more, and fig. 4 illustrates one example.
In an embodiment of the present application, the processor 402 in the PLC gateway 400 loads one or more instructions corresponding to the processes of the application program into the memory 401 according to the steps described in fig. 2, and the processor 402 executes the application program stored in the memory 402, thereby implementing the method described in fig. 2.
The Memory 401 may include a Random Access Memory (RAM), and may also include a non-volatile Memory (non-volatile Memory), such as at least one disk Memory. The memory 401 stores an operating system and operating instructions, executable modules or data structures, or a subset thereof, or an expanded set thereof, wherein the operating instructions may include various operating instructions for implementing various operations. The operating system may include various system programs for implementing various basic services and for handling hardware-based tasks.
The Processor 402 may be a general-purpose Processor, and includes a Central Processing Unit (CPU), a Network Processor (NP), and the like; the device can also be a Digital Signal Processor (DSP), an Application Specific Integrated Circuit (ASIC), a Field Programmable Gate Array (FPGA) or other Programmable logic device, a discrete Gate or transistor logic device, or a discrete hardware component.
The communicator 403 is used to implement communication connection between the database access device and other devices (such as a client, a read-write library, and a read-only library). The communicator 403 may include one or more sets of modules of different communication manners, for example, a CAN communication module communicatively connected to a CAN bus. The communication connection may be one or more wired/wireless communication means and combinations thereof. The communication method comprises the following steps: any one or more of the internet, CAN, intranet, Wide Area Network (WAN), Local Area Network (LAN), wireless network, Digital Subscriber Line (DSL) network, frame relay network, Asynchronous Transfer Mode (ATM) network, Virtual Private Network (VPN), and/or any other suitable communication network. For example: any one or a plurality of combinations of WIFI, Bluetooth, NFC, GPRS, GSM and Ethernet.
In some specific applications, the various components of the PLC gateway 400 are coupled together by a bus system that may include a power bus, a control bus, a status signal bus, and the like, in addition to a data bus. But for clarity of explanation the various busses are shown in fig. 4 as a bus system.
Fig. 5 is a schematic structural diagram of a PLC lamp according to an embodiment of the present invention. As shown, the PLC light fixture 500 includes: a PLC single lamp controller 510, an LED driving power supply 520, and an LED light source 530.
The PLC single lamp controller 510 includes: a memory 511, a processor 512, and a communicator 513; the memory 511 is used for storing computer instructions; the processor 512 executes computer instructions to implement the method described in FIG. 3; the communicator 513 is configured to be communicatively connected to the PLC gateway 400 shown in fig. 4. Here, the memory 511, the processor 512, and the communicator 513 are similar to the memory 401, the processor 402, and the communicator 403 of the PLC gateway 400 in fig. 4, and thus, detailed descriptions thereof are omitted.
Wherein the LED driving power supply 520 includes: an EMI filter 521, and a power converter 522.
It should be noted that the LED driving power supply 520 in the PLC lamp 500 belongs to power electronic equipment, is a typical electromagnetic interference noise source, and introduces complex high-frequency interference to the power line, and the electromagnetic interference introduced by the LED driving power supply 520 to the power line may reduce the PLC communication signal-to-noise ratio. And, generally speaking, the greater the fixture power, the more complicated the electromagnetic interference introduced on the power line and the more possible the PLC communication signal-to-noise ratio decreases.
In the PLC lamp 500, in order to pass EMC certification, an EMI filter 521 having a sufficiently large insertion loss must be provided in an electronic circuit of the LED driving power supply 520. An EMI filter 521 in the LED driving power supply 520, which improves the EMC (electromagnetic compatibility) performance of the power supply and obtains EMC certification for the power supply itself; however, for PLC communication, the EMI filter 521 in the driving power supply is a double-edged sword, one: the EMI filter 521 can reduce the electromagnetic pollution of a driving power supply to a power line, reduce harmful background noise on the power line and be beneficial to improving the signal-to-noise ratio of PLC communication; secondly, the following steps: EMI filter 521 will indiscriminately filter out the PLC communication signals that are beneficial on the power line, significantly reducing the PLC communication signal-to-noise ratio.
One important reason for the reduction in PLC communication signal-to-noise ratio is the high frequency noise on the power line from the switching power supply, the lower the high frequency noise, the higher the PLC communication signal-to-noise ratio may be. However, according to the EMC curve test result of the LED driving power disclosed in the industry, the test result completely meets the EMC international standard and the margin is large enough, that is, the EMC performance of the power is good, and then the signal-to-noise ratio of the PLC communication is improved by suppressing the EMI noise of the power, so that there is no room for improvement, and only other measures can be taken.
Therefore, the PLC intelligent lamp control method applied to the PLC gateway and the PLC lamp, respectively, according to the present application is a method capable of overcoming the problem of filtering the useful PLC communication signal by the EMI filter 521, on the premise of maintaining the functions of the EMI filter 521 of the LED driving power supply 520, such as improving the EMC performance of the power supply, and reducing the harmful background noise on the power line.
To achieve the above and other related objects, the present application provides a PLC intelligent lamp control system, which can be seen in fig. 1, and includes: a PLC gateway as shown in fig. 4, and one or more PLC light fixtures as shown in fig. 5: the PLC gateway and each PLC lamp belong to a PLC local area network; the PLC gateway is used for issuing lamp control instructions to each PLC lamp. The PLC gateway is in communication connection with the server and is used for remotely receiving a lamp control instruction issued by a terminal or a cloud end; and/or the PLC gateway is in communication connection with the PLC panel and is used for directly receiving the lamp control instruction.
The implementation of the PLC intelligent lamp control method proposed in the present application is intuitively explained through a field debugging process of a PLC intelligent lamp control system. For example, the intelligent hardware components in the field include: 1PLC gateway, 41 sets of PLC lamps and lanterns. Each set of PLC lamps and lanterns comprises 1PLC single lamp controller, 1 LED drive power supply and 1 LED lamps and lanterns.
In a PLC intelligent lamp control system of a test site, a fixed communication frequency band (0.7M-3M) and an adaptive communication frequency band provided by the application are adopted successively in an attempt to a PLC gateway and a PLC lamp, such as (0.7M-3M), (2.5M-5.7M) and (5.7M-12M), so as to test and compare intelligent lamp control performances under different frequency band strategies, such as: the comparison test results of the PLC intelligent lamp control system on the number of network access nodes, the network access speed, the network topology and the network stability thereof, the controlled response speed of the lamp, the controlled action consistency of the lamp and the like are listed in the following table 2. Fig. 6 shows a network topology diagram of nodes in the PLC intelligent lamp control system operating in a fixed communication frequency band, and fig. 7 shows a network topology diagram of nodes in the PLC intelligent lamp control system operating in an adaptive communication frequency band. Wherein, ball number 1 represents the PLC gateway node, and other digital balls represent PLC lamps and lanterns node. The blank sphere represents the PLC lamp nodes which are online when the network is accessed, and the shaded sphere represents the PLC lamp nodes which are offline after the network is accessed.
Table 2 comparison list of control performance of intelligent lamp by fixed communication frequency band and adaptive adjustment communication frequency band strategy
The comparison result of table 2 shows that the method can effectively suppress the filtering of the EMI filter in the LED driving power supply to the PLC communication signal, and improve the PLC communication signal-to-noise ratio to the maximum extent, thereby increasing the number of nodes that the PLC lamp can be networked, increasing the network access speed of the PLC lamp, improving the network stability after the PLC lamp is networked, increasing the response speed of the PLC lamp to the lamp control instruction, and improving the consistency of the response action of the PLC lamp to the lamp control instruction.
In summary, according to the PLC intelligent lamp control method, the PLC gateway, the PLC lamp, and the PLC system provided in the present application, a lamp control instruction including information of a current communication frequency band is issued to one or more PLC lamps connected in a PLC lan where the PLC gateway is located; judging whether response responses representing that the lamp control instructions are received and returned by the PLC lamps are received within a preset time threshold value; if yes, keeping the current communication frequency band unchanged; and if not, switching to the next adjacent communication frequency band and executing the steps from the beginning until response responses returned by the PLC lamps are received within a preset time threshold.
According to the LED driving power supply, the EMI filter in the LED driving power supply can be effectively inhibited from filtering the PLC communication signals, the PLC communication signal-to-noise ratio is improved to the maximum extent, the number of nodes of the PLC lamp capable of being networked is increased, the networking speed of the PLC lamp is accelerated, the network stability of the PLC lamp after networking is improved, the response speed of the PLC lamp to the lamp control command is accelerated, and the consistency of the response action of the PLC lamp to the lamp control command is improved.
The application effectively overcomes various defects in the prior art and has high industrial utilization value.
The above embodiments are merely illustrative of the principles and utilities of the present application and are not intended to limit the invention. Any person skilled in the art can modify or change the above-described embodiments without departing from the spirit and scope of the present application. Accordingly, it is intended that all equivalent modifications or changes which can be made by those skilled in the art without departing from the spirit and technical spirit of the present invention be covered by the claims of the present application.
Claims (10)
1. A PLC intelligent lamp control method is applied to a PLC gateway, and comprises the following steps:
sending a lamp control instruction containing information of the current communication frequency band to one or more PLC lamps connected in a PLC local area network where a PLC gateway is located;
judging whether response responses representing that the lamp control instructions are received and returned by the PLC lamps are received within a preset time threshold value;
if yes, keeping the current communication frequency band unchanged; and if not, switching to the next adjacent communication frequency band and executing the steps from the beginning until response responses returned by the PLC lamps are received within a preset time threshold.
2. The method of claim 1, wherein the switching to the next adjacent communication band is: a range of carrier frequencies is automatically increased as the next communication band.
3. The method of claim 1, wherein the light control instructions comprise: the control system comprises a single lamp control instruction for any one PLC lamp and a batch lamp control instruction for at least two PLC lamps.
4. The method of claim 3, wherein the lamp control instructions comprise: any one or more of switching action, brightness adjustment and color temperature adjustment.
5. The PLC intelligent lamp control method is applied to a PLC lamp and comprises the following steps:
receiving a lamp control instruction which contains information of a current communication frequency band and is sent by a PLC gateway connected in a PLC local area network where a PLC lamp is located;
and sending a response representing that the lamp control instruction is received back to the PLC gateway, and adjusting the modulation frequency band to the communication frequency band contained in the lamp control instruction so as to demodulate the signal of the lamp control instruction and execute corresponding control action.
6. A PLC gateway, characterized in that the PLC gateway comprises: a memory, a processor, and a communicator; the memory is to store computer instructions; the processor executes computer instructions to realize the method applied to the PLC gateway according to any one of claims 1 to 4; the communicator is used for being in communication connection with the PLC lamp, the server and the control panel.
7. A PLC light fixture, comprising: the LED driving system comprises a PLC single lamp controller, an LED driving power supply and an LED light source;
the PLC single lamp controller includes: a memory, a processor, and a communicator; the memory is to store computer instructions; the processor executes computer instructions to implement the method of any one of claim 5; the communicator is used for being in communication connection with the PLC gateway.
8. The PLC light fixture of claim 7, wherein the LED driver power supply comprises: an EMI filter, and a power converter.
9. A PLC intelligent lamp control system, characterized in that, the system includes: the PLC gateway of claim 6, and one or more PLC light fixtures of claim 7 or 8: the PLC gateway and each PLC lamp belong to a PLC local area network; the PLC gateway is used for issuing lamp control instructions to each PLC lamp.
10. The system of claim 9, wherein the PLC gateway is communicatively connected to a server for remotely receiving the lamp control command transmitted by the terminal or the cloud; and/or the PLC gateway is in communication connection with the PLC panel and is used for directly receiving the lamp control command in the lighting field.
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Application publication date: 20200828 |