CN102571150A - Time-sharing communication system on basis of power grid - Google Patents
Time-sharing communication system on basis of power grid Download PDFInfo
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- CN102571150A CN102571150A CN2011100807873A CN201110080787A CN102571150A CN 102571150 A CN102571150 A CN 102571150A CN 2011100807873 A CN2011100807873 A CN 2011100807873A CN 201110080787 A CN201110080787 A CN 201110080787A CN 102571150 A CN102571150 A CN 102571150A
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Abstract
The invention discloses a time-sharing communication system on the basis of a power grid and particularly relates to a time-sharing communication method of a system consisting of a plurality of control devices which are connected onto the same power grid line and share one power supply switch and a LED (Light-Emitting Diode) point light source and LED rail guarding lamp display system adopting the method. All the control devices of the system are connected onto the same power grid line and share the same power supply switch. A power supply half-wave rectifying circuit is adopted in each control device and all the control devices share one rectifier diode, wherein a working power supply of the system is provided by a half-wave of a power grid cyclic wave; and other half-wave time blocked up by the rectifier diode is used for communication. The time-sharing communication is implemented by using a zero-crossing signal on the power grid cyclic wave as a synchronizing signal, continuously judging and counting the synchronizing signal, determining communication time by a count value and switching on or switching off an electronic switch.
Description
(1) technical field:
The present invention relates to a kind of tdm communication system based on electrical network; Be particularly related to a kind of being connected on the same grid line; And a shared mains switch form the tdm communication method of system by a plurality of control device, and the LED point-source of light display system and the LED guard rail lamp display system of this method of employing.
(2) background technology:
Existing communication based on electrical network mainly is power line carrier communication; It is through carrier system signal to be transmitted on distribution wire; But this method complex structure needs complex device such as setup of modulator-demodulator, communication transceiver, signal amplifier; And owing to realize on the net communicating by letter in supply line and can't break away from the influence of factors such as noisy noise, this communication is unusual difficulty always, more can't in some simple application, promote.
(3) summary of the invention:
Existing communication system all needs the private communication line basically, and this general communication method is complex structure not only, and when communication line was longer, loss will be very big on order wire for signal, will dispose many sub-controllers like this.Order wire is laid in some application scenario inconvenience, and for example existing LED point-source of light display system will be if building that is used for having fitted up or sight spot will be destroyed original finishing rewiring and fit up.The present invention mainly solves and utilizes power line to realize numeral or analog signal communication, problem that need not the private communication line.For example; When being applied to LED point-source of light display system and LED guard rail lamp display system; The private communication line just can be set utilize original lighting circuit or lamp decoration circuit to realize digital signal communication, at this moment available broad pulse is represented numeral " 1 " burst pulse representes numeral " 0 " etc. method communicate.
The communication of the internal system that the present invention is applied to be made up of a plurality of control device, each control device of this system all is connected on the same grid line, and shared same mains switch, and each control device adopts power supply half-wave rectifying circuit, and a shared rectifier diode.When being applied to the LED demonstration, when for example having a plurality of LED point-source of lights or having the display system of a plurality of LED guard rail lamps compositions, at this moment each control device is exactly a point-source of light or a LED guard rail lamp.Generally speaking its shared rectifier diode be loaded on shared mains switch place or as this mains switch part of the whole so that install.After mains switch is connected; The half-wave of grid cyclic wave provides the working power of system; Hemiwave time in addition by the rectifier diode blocking-up is used for communication, and at this moment owing to the buffer action of rectifier diode to other half-wave current, the system communication circuit greatly reduces noise level when communication.
In the system communication circuit electronic switch is housed, it is to utilize grid cyclic wave by the hemiwave time of rectifier diode blocking-up, realizes tdm communication through turning on and off electronic switch.Beginning once the time of communication be to adopt the count value of zero cross signal of detection of grid cycle as time reference so that each control device begins communication when a well-determined grid cyclic wave zero passage.Turn on and off the operate time of electronic switch; Be that zero-crossing timing with grid cyclic wave is a benchmark; And according to the time error of positive and negative hemiwave time and the detection of grid cycle zero cross signal circuit and the electronic switching circuit of grid cyclic wave; Control electronic switch and make it by the beginning of each hemiwave time of rectifier diode blocking-up the time, to connect, turn-off during end.Be at the grid cyclic wave near zero-crossing point its turn-on time, and the turn-off time is after connecting electronic switch, turn-offs when finishing by half-wave standard time and the half-wave of considering error.Electronic switch is to be turned on and off by the hemiwave time of rectifier diode blocking-up at each; But for the little application system of communication information amount; Only need in the time of needs communication, to turn on and off electronic switch in order to save software and hardware resources, and needn't all will turn on and off electronic switch by each cycle after start.For example when being used for demonstration of LED point-source of light or the demonstration of LED guard rail lamp; It is through to the zero cross signal on the grid cyclic wave as synchronizing signal; Continuously synchronizing signal is judged, counted; And with definite time of communicating by letter of count value, this confirms that the count value of call duration time can be that preset or definite by Content of Communication.The work that this count value also is used to keep to have between each control device of the internal system that a plurality of control device form is synchronous, and need not the private communication line.Adopt the synchronizing signal count value to confirm call duration time; It can keep each control device to begin once to communicate by letter and connect electronic switch at same cycle near zero-crossing point; At this moment behind system's energized switch, at first carry out count value zero correction; Be to send several count value zero setting signals by main control unit continuously to other control device at start initial count value set point, count value error when being used to correct each control device start.Turning on and off electronic switch is at the grid cyclic wave near zero-crossing point; It is by cycle zero cross signal testing circuit; Single chip circuit and electronic switch are formed, and all there is error operate time in these circuit, and also there is kinematic error in the grid cyclic wave time; Therefore confirm electronic switch turn on and off the time time, must consider above-mentioned time error.
Behind the system power supply switch open,, single-chip microcomputer continuous acquisition grid cyclic wave, cycle input circuit are used for converting grid cyclic wave into single-chip microcomputer accessible signal, and with single-chip microcomputer the zero cross signal of grid cyclic wave are carried out identification decision and counting.The mains switch 1 that its each control device is shared is used to make each control device in the communication of same grid cyclic wave half-wave.The rectifier diode 2 that each control device is shared is used for the power supply halfwave rectifier, and the blocking-up grid cyclic wave is half-wave current in addition, and it can transmit signal of communication easily on power line.Cycle input circuit 4 is used for the passage of continuous acquisition grid cyclic wave synchronizing signal, and it converts grid cyclic wave into single-chip microcomputer 5 accessible signals, and therewith the grid cyclic wave synchronizing signal is carried out identification decision and counting.Single-chip microcomputer 5 is used for producing and sending various control commands.Electronic switch 6 is used for isolating or connecting telecommunication circuit, and its connection is the control of protected circuit also, and promptly when occurring on the power line surpassing the threshold value of protection voltage, electronic switch 6 is in reliable off state.Signal processing 7 is used for the signal integer, also is used for signal identification, judges with single-chip microcomputer 5 simultaneously.Its storage and drive circuit 8 are used to store the signal that receives and send, and drive circuit for lamp work.
(4) description of drawings:
Fig. 1 is a kind of circuit structure block diagram of LED point-source of light display system or LED guard rail lamp display system.
Wherein power supply 3 is step-down, rectification, filter circuit, and it is that it isolates signal path and high pressure when occurring surpassing the threshold value of protecting voltage on the power line that electronic switch 6 comprises high-voltage isolation protective circuit, so it comprises the circuit of obtaining voltage division signal from power line.Only the draw block diagram A of a control device of this accompanying drawing, all the other block diagrams are identical with it.
(5) embodiment:
Embodiment 1:LED point-source of light display system and LED guard rail lamp display system
When the present invention is used for LED point-source of light display system or LED guard rail lamp display system.Each control device in the system; Be in the system each LED point-source of light or each LED guard rail lamp by shared mains switch 1; Be used to make each control device in the communication of same grid cyclic wave half-wave, shared rectifier diode 2 is loaded on the shared power switch box, is used for the power supply halfwave rectifier; The blocking-up grid cyclic wave in addition half-wave current it signal of communication can be transmitted on power line easily, and when communication with electrical network half-wave current isolation in addition.Power supply 3 is with the step-down of electrical network high pressure and rectification, filtering; Power supply as control device; Cycle input circuit 4 is used for the passage of continuous acquisition grid cyclic wave synchronizing signal; It converts grid cyclic wave into single-chip microcomputer 5 accessible signals, and therewith the grid cyclic wave synchronizing signal is carried out identification decision and counting.The control signal of single-chip microcomputer 5 output electronic switches 6; Be used for the electronic switch isolation or connect telecommunication circuit; In electronic switch 6, also comprise high-voltage isolation protective circuit; It comprises from power line obtains voltage division signal, when voltage division signal surpasses the threshold value of protection voltage, turn-offs electronic switch 6 and avoids high pressure to get into telecommunication circuit.Signal processing 7 is used for signal identification, judges and filters with single-chip microcomputer 5.Signal processing 7 is single-chip microcomputer 5 accessible signals with the conversion of signals that receives also, and conversion of signals to be sent is the signal with suitable potential, so that on power line, transmit.Its storage and drive circuit 8 are used to store the signal that receives and send, and drive circuit for lamp 9 work.
System is the set point of ondomete numerical value or the predetermined point that is provided with by the signal of communication content at call duration time; Utilizing the grid cyclic wave zero cross signal to produce zero passage by single-chip microcomputer 5 interrupts; In interrupt routine, calculate to connect the time of electronic switch 6, and send and go code, single-chip microcomputer 5 is also according to the potential change on the power line; When current potential exceeds safety value, turn-off electronic switch, realize high-voltage isolation protective.
Digital signal is represented numeral by broad pulse " 1 ", burst pulse is represented numeral " and 0 " form, transmit through signal processing 7, electronic switch 6 through single-chip microcomputer 5 serial ports.
Claims (2)
1. tdm communication system based on electrical network; Each control device of this system all is connected on the same grid line; And shared same mains switch, each control device adopts the power supply half-wave rectifying circuit, when being applied to the LED demonstration; Each control device is exactly a point-source of light or a LED guard rail lamp; It is characterized in that the shared rectifier diode of each control device of system, it is to utilize grid cyclic wave by the hemiwave time of rectifier diode blocking-up, realizes tdm communication through turning on and off electronic switch; Be that the zero-crossing timing with grid cyclic wave is a benchmark operate time that turns on and off electronic switch; And according to positive and negative hemiwave time and the circuit of detection of grid cycle zero cross signal and the time error of electronic switching circuit of grid cyclic wave, control electronic switch and make it by the beginning of each hemiwave time of rectifier diode blocking-up the time, to connect, turn-off during end; When being used for demonstration of LED guardrail pipe or the demonstration of LED point-source of light; It is through to the zero cross signal on the grid cyclic wave as synchronizing signal; Continuously synchronizing signal is judged, counted; And confirm time of communication with count value, so that each control device begins communication when well-determined grid cyclic wave zero passage.
2. tdm communication system based on electrical network is characterized in that each control device comprises:
The cycle input circuit is used for the passage of single-chip microcomputer continuous acquisition grid cyclic wave, and it converts grid cyclic wave into single-chip microcomputer accessible signal, and with single-chip microcomputer the zero cross signal of grid cyclic wave is carried out identification decision and counting;
Mains switch, the mains switch that each control device is shared is used to make each control device in the communication of same grid cyclic wave half-wave;
Rectifier diode, the rectifier diode that each control device is shared is used for the power supply halfwave rectifier, and the blocking-up grid cyclic wave is half-wave current in addition;
Electronic switch is used for isolating or connecting telecommunication circuit;
Storage and drive circuit are used to store the signal that receives and send, and drive circuit for lamp work;
Single-chip microcomputer is used for producing and sending various control commands;
Signal processing is used for the signal integer, also is used for signal identification, judges with single-chip microcomputer simultaneously.
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| CN201110080787.3A CN102571150B (en) | 2011-03-22 | 2011-03-22 | Time-sharing communication system on basis of power grid |
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| CN201110080787.3A CN102571150B (en) | 2011-03-22 | 2011-03-22 | Time-sharing communication system on basis of power grid |
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