CN105227240A - Based on the industrial communication systems of visible ray - Google Patents
Based on the industrial communication systems of visible ray Download PDFInfo
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- CN105227240A CN105227240A CN201510729486.7A CN201510729486A CN105227240A CN 105227240 A CN105227240 A CN 105227240A CN 201510729486 A CN201510729486 A CN 201510729486A CN 105227240 A CN105227240 A CN 105227240A
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Abstract
The invention provides a kind of industrial communication systems based on visible ray, comprise communication sending module and communication receipt module; Described communication sending module comprises transmitting terminal interface circuit, transmitting terminal control unit, transmitting terminal signal processing circuit and LED light source; Described communication receipt module comprises photodiode, receiving end signal treatment circuit, receiving terminal control unit and receiving terminal interface circuit; The present invention utilizes LED light source to realize Signal transmissions, the mode of this visible light communication is compared with the radio communication (radio communication, infrared communication) in industrial circle, there is coverage controlled, not easily be stolen, have that high security and confidentiality and transmitting power are high, use occasion is wide, without the advantage such as electromagnetic interference and energy savings.And communication can be carried out anywhere or anytime and not need to lay in addition extra auxiliary equipment, if terminal photelectric receiver is housed just can the visible ray information that sends of receiving end/sending end.
Description
Technical field
The present invention relates to industrial communication field, particularly relate to a kind of industrial communication systems based on visible ray.
Background technology
Along with developing rapidly of LED industry, the visible light communication technology based on LED illumination device is in the opportune moment by industrialization." green illumination " based on LED light source has the feature of protection of the environment, energy savings; and LED have use voltage low, low in energy consumption, life-span long, be easy to miniaturized etc. to modern society and useful many effects thereof, meet the theory of human social.
At present, the radio communication of industrial circle mainly uses radio communication and infrared communication, and its coverage is uncontrollable, is easily stolen, so its fail safe and confidentiality are all extremely limited, and adopts the mode of radio frequency and infrared communication to be subject to electromagnetic interference.
Summary of the invention
The technical problem to be solved in the present invention is the safety issue how solving radio communication.
In order to solve this technical problem, the invention provides a kind of industrial communication systems based on visible ray, comprising communication sending module and communication receipt module; Described communication sending module comprises transmitting terminal interface circuit, transmitting terminal control unit, transmitting terminal signal processing circuit and LED light source; Described communication receipt module comprises photodiode, receiving end signal treatment circuit, receiving terminal control unit and receiving terminal interface circuit;
Described transmitting terminal control unit is converted into digital electric signal after carrying out coding and checking treatment in order to the data flow described transmitting terminal interface circuit transmission come, and transfers to described transmitting terminal signal processing circuit;
Described transmitting terminal signal processing circuit, in order to drive described LED light source luminous according to described digital electric signal, sends light signal;
Described photodiode generates corresponding current signal in order to respond described light signal, and reaches described receiving end signal treatment circuit;
Described receiving end signal treatment circuit in order to obtain corresponding analog signal according to the current signal received, and reaches described receiving terminal control unit;
Described receiving terminal control unit, in order to carry out to the received signal decoding and verifying, obtains data flow, and is transferred to external industrial equipment by described receiving terminal interface.
Optionally, described transmitting terminal interface circuit and receiving terminal interface circuit are CAN interface or 485 interfaces or USB interface.
Optionally, described transmitting terminal signal processing circuit is LED drive circuit, in order to according to 1/0 digital signal received, drives the conducting of described LED light source and power-off to change.
Optionally, described receiving end signal treatment circuit comprises current-voltage conversion unit and programmable analog chip;
Described current-voltage conversion unit exports described programmable analog chip to after being converted into voltage signal in order to the current signal described photodiode feedback come;
Described programmable analog chip, in order to the control according to its outside input, carries out filtering to the voltage signal received and after amplifying, finally exports described receiving terminal control unit to.
Optionally, described programmable analog integrated chip has band pass filter and variable gain amplifier;
Described band pass filter, in order to carry out filtering according to the outside bandwidth determined that inputs to the voltage signal received, then reaches described variable gain amplifier;
Described variable gain amplifier is in order to amplify filtered signal, described in then reaching according to the outside multiplication factor determined that inputs
Receiving terminal control unit.
Described programmable analog chip receives outside input by described receiving terminal control unit, and then carries out filtering and amplification accordingly.
Optionally, the switching frequency of described LED light source is greater than 200Hz.
Optionally, the described industrial communication systems based on visible ray also comprises with thinking the power module that described transmitting terminal interface circuit, transmitting terminal control unit, transmitting terminal signal processing circuit, receiving end signal treatment circuit, receiving terminal control unit and receiving terminal interface circuit are powered.
Optionally, 4PPM is adopted to encode respectively and CRC-16 verification when described transmitting terminal control unit coding and verification; 4PPM is adopted to encode respectively and CRC-16 verification when described receiving terminal control unit decoding and verification.
The present invention utilizes LED light source to realize Signal transmissions, the mode of this visible light communication is compared with the radio communication (radio communication, infrared communication) in industrial circle, there is coverage controlled, not easily be stolen, have that high security and confidentiality and transmitting power are high, use occasion is wide, without the advantage such as electromagnetic interference and energy savings.And communication can be carried out anywhere or anytime and not need to lay in addition extra auxiliary equipment, if terminal photelectric receiver is housed just can the visible ray information that sends of receiving end/sending end.
Accompanying drawing explanation
Fig. 1 is the schematic diagram based on the industrial communication systems of visible ray in one embodiment of the invention;
Fig. 2 is the schematic diagram of sending module of communicating in one embodiment of the invention;
Fig. 3 is the schematic diagram of communication receipt module in one embodiment of the invention;
Fig. 4 is the connection diagram of programmable analog chip and receiving terminal control unit in one embodiment of the invention.
Embodiment
Below with reference to Fig. 1 to Fig. 4, the industrial communication systems based on visible ray provided by the invention is described in detail, it is optional embodiment of the present invention, can think, those skilled in the art can modify to it and polish in the scope not changing the present invention's spirit and content.
Please refer to Fig. 1, the invention provides a kind of industrial communication systems based on visible ray, comprise communication sending module and communication receipt module; Described communication sending module comprises transmitting terminal interface circuit, transmitting terminal control unit, transmitting terminal signal processing circuit and LED light source; Described communication receipt module comprises photodiode, receiving end signal treatment circuit, receiving terminal control unit and receiving terminal interface circuit;
Described transmitting terminal control unit is converted into digital electric signal after carrying out coding and checking treatment in order to the data flow described transmitting terminal interface circuit transmission come, and transfers to described transmitting terminal signal processing circuit;
Described transmitting terminal signal processing circuit, in order to drive described LED light source luminous according to described digital electric signal, sends light signal;
Described photodiode generates corresponding current signal in order to respond described light signal, and reaches described receiving end signal treatment circuit;
Described receiving end signal treatment circuit in order to obtain corresponding analog signal according to the current signal received, and reaches described receiving terminal control unit;
Described receiving terminal control unit, in order to carry out to the received signal decoding and verifying, obtains data flow, and is transferred to external industrial equipment by described receiving terminal interface.
About the process that it sends and receives, can simplify and be expressed as:
When communication sending module sends data, described transmitting terminal control unit is by after described interface circuit receiving data stream, be that the digital electric signal of <10Kbps is transferred to described transmitting terminal signal processing circuit by Data Stream Processing, described transmitting terminal signal processing circuit exports being carried in after digital electric signal process on described LED light source;
When communication receipt module receives data, described photodiode receiving optical signals also converts current signal transfer to described receiving end signal treatment circuit, Received signal strength processing module is controlled by described control unit, the signal of reception is converted to the signal of telecommunication that control unit can receive by described receiving end signal processing module, the datagram received number is treated to data flow by described receiving terminal control unit, and is controlled to industrial equipment by the data stream transmitting after process by described receiving terminal interface circuit.
In optional embodiment of the present invention, the described industrial communication systems based on visible ray also comprises with thinking the power module that described transmitting terminal interface circuit, transmitting terminal control unit, transmitting terminal signal processing circuit, receiving end signal treatment circuit, receiving terminal control unit and receiving terminal interface circuit are powered.
About described communication sending module:
In optional embodiment of the present invention, described transmitting terminal interface circuit is CAN interface or 485 interfaces or USB interface.Described transmitting terminal signal processing circuit is LED drive circuit, in order to according to 1/0 digital signal received, drives the conducting of described LED light source and power-off to change.The switching frequency of described LED light source is greater than 200Hz.4PPM is adopted to encode respectively and CRC-16 verification when described transmitting terminal control unit coding and verification.
Following possibility is attached in process of transmitting above, can be embodied as:
External communication device sends data to transmitting terminal control unit by transmitting terminal interface circuit, transmitting terminal control unit carries out CRC-16 verification for the data received, and the data after verification are carried out 4PPM coding, the data-driven LED after coding constantly carries out switching outputing signal between " bright " and " going out ".In order to make human eye perceives less than the flicker of light, in this possibility, the switching frequency carrying out LED is greater than 200Hz.LED drive circuit employs two-stage amplifying circuit, effectively can strengthen the light intensity of LED, makes LED can be irradiated to farther distance.So far, industrial communication sending module completes and is launched in the mode of visible ray by signal.
About described communication receipt module:
In optional embodiment of the present invention, match with transmitting terminal mentioned above, receiving terminal interface circuit is CAN interface or 485 interfaces or USB interface; 4PPM is adopted to encode respectively and CRC-16 verification when described receiving terminal control unit decoding and verification.
Receiving end signal treatment circuit about wherein:
In optional embodiment of the present invention, please refer to Fig. 3 and Fig. 4, described receiving end signal treatment circuit comprises current-voltage conversion unit and programmable analog chip;
Described current-voltage conversion unit exports described programmable analog chip to after being converted into voltage signal in order to the current signal described photodiode feedback come;
Described programmable analog chip, in order to the control according to its outside input, carries out filtering to the voltage signal received and after amplifying, finally exports described receiving terminal control unit to.
In the further alternative embodiment of the present invention, described programmable analog integrated chip has band pass filter and variable gain amplifier;
Described band pass filter, in order to carry out filtering according to the outside bandwidth determined that inputs to the voltage signal received, then reaches described variable gain amplifier;
Described variable gain amplifier is in order to amplify filtered signal, described in then reaching according to the outside multiplication factor determined that inputs
Receiving terminal control unit.
Described programmable analog chip receives outside input by described receiving terminal control unit, and then carries out filtering and amplification accordingly.Specifically, please refer to Fig. 4, programmable analog chip is also integrated with control response module (controlregister) and chip main circuit (ReconfigurableAnalogCircuit), band pass filter, variable gain amplifier and DA change-over circuit are integrated in described chip main circuit, chip is by the control inputs of the corresponding described receiving terminal control unit of described control response module (controlregister), and the content of input is recorded in the memory (Flashrom) of receiving terminal control unit.
Visible, receiving end signal treatment circuit employs integrated programmable analog chip inside and is integrated with configurable amplifier, synchronously detects amplifier, General operational amplifier, and DA changes, temperature sensor etc.Programmable analog chip is usually used to the small-signal for the treatment of of simulated front end.Control unit can pass through the internal integrated circuit of SPI (SerialPeripheralInterface) Interface Controller programmable analog chip.Wherein the front end amplifier of programmable analog chip plays the logical effect of band, and rear end amplifier plays gain control action, and it selects the capacitance-resistance value be applicable to make bandwidth between 150Hz ~ 15Khz, and makes output voltage meet the input range of AD Acquisition Circuit.
In conjunction with the description of above possibility, previously mentioned receiving course can launch to be described as further:
In receiving circuit, use the visible light signal that photodiode reception LED sends, and be converted into the signal of telecommunication.Current-voltage conversion circuit converts current signal to voltage signal.Variable gain amplifier be used for through conversion after faint voltage signal.Band pass filter is used for the Noise and Interference produced in filtered signal transmitting procedure, obtains smoother square-wave signal.Signal bandwidth, greatly about 10kHz, should be selected the amplifier of appropriate bandwidth and the parameter of band pass filter, otherwise can affect the transmission of signal, causes not can completely to restore signal.Signal after amplification filtering enters receiving terminal control unit after being gathered by AD.Receiving terminal control unit receive AD gather after data carry out 4PPM decoding, CRC-16 verify inspection, and after verifying and checking, correct data are sent to industrial equipment and control.
In sum, the present invention's LED light source realizes Signal transmissions, the mode of this visible light communication is compared with the radio communication (radio communication, infrared communication) in industrial circle, there is coverage controlled, not easily be stolen, have that high security and confidentiality and transmitting power are high, use occasion is wide, without the advantage such as electromagnetic interference and energy savings.And communication can be carried out anywhere or anytime and not need to lay in addition extra auxiliary equipment, if terminal photelectric receiver is housed just can the visible ray information that sends of receiving end/sending end.
Claims (9)
1. based on an industrial communication systems for visible ray, it is characterized in that: comprise communication sending module and communication receipt module; Described communication sending module comprises transmitting terminal interface circuit, transmitting terminal control unit, transmitting terminal signal processing circuit and LED light source; Described communication receipt module comprises photodiode, receiving end signal treatment circuit, receiving terminal control unit and receiving terminal interface circuit;
Described transmitting terminal control unit is converted into digital electric signal after carrying out coding and checking treatment in order to the data flow described transmitting terminal interface circuit transmission come, and transfers to described transmitting terminal signal processing circuit;
Described transmitting terminal signal processing circuit, in order to drive described LED light source luminous according to described digital electric signal, sends light signal;
Described photodiode generates corresponding current signal in order to respond described light signal, and reaches described receiving end signal treatment circuit;
Described receiving end signal treatment circuit in order to obtain corresponding analog signal according to the current signal received, and reaches described receiving terminal control unit;
Described receiving terminal control unit, in order to carry out to the received signal decoding and verifying, obtains data flow, and is transferred to external industrial equipment by described receiving terminal interface.
2. as claimed in claim 1 based on the industrial communication systems of visible ray, it is characterized in that: described transmitting terminal interface circuit and receiving terminal interface circuit are CAN interface or 485 interfaces or USB interface.
3. as claimed in claim 1 based on the industrial communication systems of visible ray, it is characterized in that: described transmitting terminal signal processing circuit is LED drive circuit, in order to according to 1/0 digital signal received, drive the conducting of described LED light source and power-off to change.
4., as claimed in claim 1 based on the industrial communication systems of visible ray, it is characterized in that: described receiving end signal treatment circuit comprises current-voltage conversion unit and programmable analog chip;
Described current-voltage conversion unit exports described programmable analog chip to after being converted into voltage signal in order to the current signal described photodiode feedback come;
Described programmable analog chip, in order to the control according to its outside input, carries out filtering to the voltage signal received and after amplifying, finally exports described receiving terminal control unit to.
5., as claimed in claim 4 based on the industrial communication systems of visible ray, it is characterized in that: described programmable analog integrated chip has band pass filter and variable gain amplifier;
Described band pass filter, in order to carry out filtering according to the outside bandwidth determined that inputs to the voltage signal received, then reaches described variable gain amplifier;
Described variable gain amplifier, in order to amplify filtered signal according to the outside multiplication factor determined that inputs, then reaches described receiving terminal control unit.
6. as claimed in claim 4 based on the industrial communication systems of visible ray, it is characterized in that: described programmable analog chip receives outside input by described receiving terminal control unit, and then carries out filtering and amplification accordingly.
7., as claimed in claim 1 based on the industrial communication systems of visible ray, it is characterized in that: the switching frequency of described LED light source is greater than 200Hz.
8., as claimed in claim 1 based on the industrial communication systems of visible ray, it is characterized in that: also comprise with thinking the power module that described transmitting terminal interface circuit, transmitting terminal control unit, transmitting terminal signal processing circuit, receiving end signal treatment circuit, receiving terminal control unit and receiving terminal interface circuit are powered.
9. as claimed in claim 1 based on the industrial communication systems of visible ray, it is characterized in that: when described transmitting terminal control unit coding and verification, adopt 4PPM to encode respectively and CRC-16 verification; 4PPM is adopted to encode respectively and CRC-16 verification when described receiving terminal control unit decoding and verification.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201510729486.7A CN105227240A (en) | 2015-10-30 | 2015-10-30 | Based on the industrial communication systems of visible ray |
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| CN201510729486.7A CN105227240A (en) | 2015-10-30 | 2015-10-30 | Based on the industrial communication systems of visible ray |
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| CN106961304A (en) * | 2017-02-28 | 2017-07-18 | 深圳前沿通信技术开发有限公司 | The multi-channel control methods, devices and systems of visible light communication |
| CN110618414A (en) * | 2018-06-19 | 2019-12-27 | 广东技术师范学院 | Laser radar scanner based on optomagnetic mode |
| CN113114362A (en) * | 2021-05-14 | 2021-07-13 | 王菊杨 | LED flash communication chip |
| CN114187753A (en) * | 2021-11-25 | 2022-03-15 | 珠海格力电器股份有限公司 | Data transmission device, method, control device and electrical equipment |
| CN116054945A (en) * | 2023-04-06 | 2023-05-02 | 深圳华创芯光科技有限公司 | High-reliability unidirectional optical wireless communication data transmission system |
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| CN113114362A (en) * | 2021-05-14 | 2021-07-13 | 王菊杨 | LED flash communication chip |
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| CN116054945A (en) * | 2023-04-06 | 2023-05-02 | 深圳华创芯光科技有限公司 | High-reliability unidirectional optical wireless communication data transmission system |
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