CN102571150B - 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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- CN102571150B CN102571150B CN201110080787.3A CN201110080787A CN102571150B CN 102571150 B CN102571150 B CN 102571150B CN 201110080787 A CN201110080787 A CN 201110080787A CN 102571150 B CN102571150 B CN 102571150B
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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, being particularly related to one is connected on same grid line, and share a mains switch form the tdm communication method of system by multiple control device, and LED point-source of light display system and the LED guard rail lamp display system of employing the method.
(2) background technology:
The existing communication based on electrical network is mainly power line carrier communication, it is by carrier system, signal to be transmitted on distribution wire, but this method complex structure needs the complex device such as setup of modulator-demodulator, communication transceiver, signal amplifier, and owing to realizing communication on the net in supply line and cannot break away from the impact of the factors such as noisy noise, this communication is always very difficult, more cannot in some simple application, promote.
(3) summary of the invention:
Existing communication system all needs private communication line substantially, not only complex structure of this general communication method, and also in the time that communication line is longer, loss will be very large on order wire for signal, will configure so many sub-controllers.Order wire is laid in some application scenario inconvenience, and for example existing LED point-source of light display system, if building or the sight spot for having fitted up 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 private communication line.For example, in the time being applied to LED point-source of light display system and LED guard rail lamp display system, private communication line just can be set and utilize original lighting circuit or light circuit to realize digital signal communication, at this moment can use broad pulse representative digit " 1 " burst pulse representative digit " 0 " etc. method communicate.
The present invention is applied to the communication of the internal system being made up of multiple control device, and each control device of this system is all connected on same grid line, and shares same mains switch, and each control device adopts power supply half-wave rectifying circuit, and shares a rectifier diode.In the time being applied to LED demonstration, for example, when having multiple LED point-source of lights or having the display system of multiple 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 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, be rectified the another hemiwave time of diode blocking-up for communication, at this moment due to the buffer action of rectifier diode to another half-wave current, system communication circuit greatly reduces noise level in the time of communication.
In system communication circuit, electronic switch is housed, it is to utilize grid cyclic wave to be rectified the hemiwave time of diode blocking-up, realizes tdm communication by turning on and off electronic switch.The time that starts once communication is to adopt the count value of zero cross signal of detection of grid cycle as time reference, so that each control device starts communication in the time of a well-determined grid cyclic wave zero passage.Turn on and off the operate time of electronic switch, that zero-crossing timing taking grid cyclic wave is as benchmark, and according to the time error of the positive and negative hemiwave time of grid cyclic wave and detection of grid cycle zero-crossing signal circuit and electronic switching circuit, control electronic switch and make it to connect in the time of the beginning of each hemiwave time that is rectified diode blocking-up, when end, turn-off.Be at grid cyclic wave near zero-crossing point its turn-on time, and the turn-off time is to connect after electronic switch, while end, turn-offs by half-wave standard time the half-wave of considering error.Electronic switch is to turn on and off at each hemiwave time that is rectified diode blocking-up, but for the little application system of communication information amount, only need within the time of needs communication, turn on and off electronic switch in order to save software and hardware resources, and needn't will turn on and off electronic switch by the each cycle after start.For example, in the time being used for the demonstration of LED point-source of light or the demonstration of LED guard rail lamp, it is as synchronizing signal by the zero cross signal on grid cyclic wave, continuously synchronizing signal is judged, counted, and determine the time of communicating by letter by count value, this determines that the count value of call duration time can be preset or be determined by Content of Communication.This count value is also synchronous for keeping having work between each control device of internal system of multiple control device compositions, and need not private communication line.Adopt synchronizing signal count value to determine call duration time, it can keep each control device to start once communicate by letter and connect electronic switch at same cycle near zero-crossing point, at this moment after switching on power switch, system first carries out count value zero correction, continuously to send several count value zero setting signals by main control unit to other control device at start initial count value set point, count value error while start for correcting each control device.Turning on and off electronic switch is at grid cyclic wave near zero-crossing point, it is by cycle zero passage signal detection circuit, single chip circuit and electronic switch composition, all there is error operate time in these circuit, also there is kinematic error in the grid cyclic wave time, therefore determine electronic switch turn on and off the time time, must consider above-mentioned time error.
After system power supply switch open,, single-chip microcomputer continuous acquisition grid cyclic wave, cycle input circuit is used for grid cyclic wave to be converted to the accessible signal of single-chip microcomputer, and together with single-chip microcomputer, the zero cross signal of grid cyclic wave is carried out to identification decision and counting.The mains switch 1 that its each control device is shared, for making each control device at same grid cyclic wave half wave communication.The rectifier diode 2 that each control device is shared, for power supply halfwave rectifier, the another half-wave current of blocking-up grid cyclic wave, it can transmit signal of communication easily on power line.Cycle input circuit 4 is for the passage of continuous acquisition grid cyclic wave synchronizing signal, and grid cyclic wave is converted to the accessible signal of single-chip microcomputer 5 by it, and therewith grid cyclic wave synchronizing signal is carried out to identification decision and counting.Single-chip microcomputer 5 for generation of and send various control commands.Electronic switch 6 is for isolation or connect telecommunication circuit, and its connection is the control of protected circuit also, and, in the time occurring on power line exceeding the threshold value of protecting voltage, electronic switch 6 is in reliable off state.Signal processes 7 for signal integer, is also used from signal identification, judges with single-chip microcomputer 5 one simultaneously.Its storage and drive circuit 8, for the signal of storing received and transmission, and drive circuit for lamp work.
(4) brief description of the 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 while occurring on power line exceeding the threshold value of protecting voltage, it makes signal path and high pressure isolation that electronic switch 6 comprises high-voltage isolation protective circuit, and therefore it comprises the circuit of obtaining voltage division signal from power line.This accompanying drawing only draws the block diagram A of a control device, and 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 system, be in system each LED point-source of light or each LED guard rail lamp by shared mains switch 1, be used for making each control device at same grid cyclic wave half wave communication, shared rectifier diode 2 is loaded in shared power switch box, for power supply halfwave rectifier, it can transmit signal of communication easily blocking-up grid cyclic wave another half-wave current on power line, and isolates with the another half-wave current of electrical network in the time of communication.Power supply 3 is by the step-down of electrical network high pressure and rectification, filtering, as the power supply of control device, cycle input circuit 4 is for the passage of continuous acquisition grid cyclic wave synchronizing signal, grid cyclic wave is converted to the accessible signal of single-chip microcomputer 5 by it, and therewith grid cyclic wave synchronizing signal is carried out to identification decision and counting.Single-chip microcomputer 5 is exported the control signal of electronic switch 6; for electronic switch isolation or connection telecommunication circuit; in electronic switch 6, also comprise high-voltage isolation protective circuit; it comprises from power line obtains voltage division signal; in the time that voltage division signal exceedes the threshold value of protecting voltage, turn-off electronic switch 6 and avoid high pressure to enter telecommunication circuit.Signal is processed 7 and is used from signal identification, judges and filters with single-chip microcomputer 5 one.Signal is processed 7 and also the signal of reception is converted to the accessible signal of single-chip microcomputer 5, and signal to be sent is converted to the signal with suitable potential, to transmit on power line.Its storage and drive circuit 8, for the signal of storing received and transmission, and drive circuit for lamp 9 to work.
System is the set point of ondomete numerical value or the predetermined point that arranged by signal of communication content at call duration time; utilizing grid cyclic wave zero cross signal to produce zero passage by single-chip microcomputer 5 interrupts; in interrupt routine, calculate the time of connecting electronic switch 6; and transmission goes code; single-chip microcomputer 5 is also according to the potential change on power line; in the time that current potential exceeds safety value, turn-off electronic switch, realize high-voltage isolation protective.
Digital signal is by broad pulse representative digit " 1 ", burst pulse representative digit " and 0 " composition, transmits through signal processing 7, electronic switch 6 by single-chip microcomputer 5 serial ports.
Claims (2)
1. the tdm communication system based on electrical network, each control device of this system is all connected on same grid line, and shared same mains switch, each control device adopts power supply half-wave rectifying circuit, in the time being applied to LED demonstration, each control device is exactly a point-source of light or a LED guard rail lamp, it is characterized in that the each control device of system shares a rectifier diode, described tdm communication system is to utilize grid cyclic wave to be rectified the hemiwave time of diode blocking-up, realize tdm communication by turning on and off electronic switch, be that zero-crossing timing taking grid cyclic wave is as benchmark the operate time that turns on and off electronic switch, and according to the circuit of zero cross signal of the positive and negative hemiwave time of grid cyclic wave and detection of grid cycle and the time error of electronic switching circuit, controlling electronic switch makes it to connect in the time of the beginning of each hemiwave time that is rectified diode blocking-up, when end, turn-off, described tdm communication system is as synchronizing signal by the zero cross signal on grid cyclic wave, continuously synchronizing signal is judged, counted, and determine the time of communicating by letter by count value, so that each control device starts communication in the time of well-determined grid cyclic wave zero passage.
2. the tdm communication system based on electrical network, is characterized in that the each control device that participates in communication in described tdm communication system comprises:
Cycle input circuit, for the passage of single-chip microcomputer continuous acquisition grid cyclic wave, grid cyclic wave is converted to the accessible signal of single-chip microcomputer by it, and together with single-chip microcomputer, the zero cross signal of grid cyclic wave is carried out to identification decision and counting;
Mains switch, the mains switch that each control device is shared, for making half wave communication of each control device at same grid cyclic wave;
Rectifier diode, the rectifier diode that each control device is shared, for power supply halfwave rectifier, the another half-wave current of blocking-up grid cyclic wave;
Electronic switch, for isolation or connection telecommunication circuit;
Storage and drive circuit, for the signal of storing received and transmission, and drive circuit for lamp work;
Single-chip microcomputer, for generation of and send various control commands;
Signal processing, for signal integer, is also used from signal identification, judges with single-chip microcomputer one 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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| CN102571150A CN102571150A (en) | 2012-07-11 |
| CN102571150B true CN102571150B (en) | 2014-06-25 |
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