CN105960045B - The implementation method and device of communication illumination sharing system based on LED high illumination efficiency - Google Patents
The implementation method and device of communication illumination sharing system based on LED high illumination efficiency Download PDFInfo
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- CN105960045B CN105960045B CN201610280899.6A CN201610280899A CN105960045B CN 105960045 B CN105960045 B CN 105960045B CN 201610280899 A CN201610280899 A CN 201610280899A CN 105960045 B CN105960045 B CN 105960045B
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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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- 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
- H05B45/37—Converter circuits
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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]
- H05B45/40—Details of LED load circuits
- H05B45/44—Details of LED load circuits with an active control inside an LED matrix
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Abstract
The invention discloses the implementation methods and device of a kind of communication illumination sharing system of the high illumination efficiency of LED based.Its implementation is to reduce the charge and discharge number of LED junction capacitor using the communication plan of multi-pulse failing edge coding, to reduce the power because of charge and discharge electric consumption, improves illumination efficiency；Using variable length symbol width, driving signal the low level duration is shortened, improves the duty ratio of driving signal, to improve brightness of illumination.Transmitting terminal uses multicomponent coding, and data to be transmitted is divided into one group of the position n, and the code value of every group of data corresponds to different pulse falling edge positions, after signal pulse decline, is risen immediately with the most fast possible speed of system, carries out the transmission of next symbol；Receiving end recovers corresponding code value according to the position of failing edge as time reference using the rising edge of a pulse received, completes data transmission.
Description
Technical field
The present invention relates to LED based visible light communication and lighting areas, high more particularly, to a kind of LED based
The implementation method and device of the communication illumination sharing system of illumination efficiency.
Background technique
White light LEDs have many advantages, such as that energy-saving and environment friendly is efficient as a kind of semiconductor light source, and gradually substitution is traditional
Incandescent lamp, fluorescent lamp, high-voltage gas discharging light become the light source of 21 century most prospect.On the one hand there is white light LEDs transmitting to imitate
The features such as rate is high, to eye-safe；On the other hand, have many advantages, such as that reaction speed is fast, modularity is good.With White-light LED illumination
It promotes, people begin to focus on the visible light communication based on white light LEDs, and white LED lamp can not only use room lighting, but also available
The white light that LED is issued, forms a kind of short-distance wireless optical communication link.Many scholars propose based on illuminating white light
Indoor visible light communication (VLC visible-light communication) system of LED.Controller carries out white light LEDs
The electric signal for transmitting information is converted to optical signal by modulation, realizes that indoor wireless transmits in the way of white light LEDs light-illuminating,
Optical receiving device is installed in white LED lamp light irradiation range simultaneously, converts optical signals to electric signal, it is wireless to establish visible light
Communication system realizes the transmission of information.Compared with traditional radio communication and other wireless communication systems, it is seen that optical communication technology
The advantages that art has transmission power high, is not take up radio-frequency spectrum, no electromagnetic interference and electromagnetic-radiation-free, energy saving.At present
Visible light communication technology has become multiple national research hotspots, most of under test, although total system is existing
It realizes, but from the practical stage there are also with a certain distance from, the performance indexes of system needs to be further increased, and implementation is also required to
It is further perfect.
Presently, there are the problem of first is that excessive power drain problem caused by LED junction capacitor:
The transmission medium of visible light communication is free space, and the angle of divergence of the LED light emitting diode for illumination is bigger,
Therefore the geometry loss of signal transmission is larger, and the signal for eventually arriving at receiver is far smaller than transmitting terminal.Although having reported biography
Defeated rate is greater than the experimental system of 1Gbt/s, but realizes that the distance of high-speed transfer only has several centimetres.
When communication distance becomes larger, loss of signal is serious, and the bit error rate rises, and cannot reach the requirement of signal transmission.
The distance for improving transmission needs to increase the power of transmitting signal, i.e. the optical power output of increase LED, this just needs to increase LED
Light-emitting area, and the increase of area causes the junction capacity of device to increase, and frequency response characteristic decline, maximum communication rate is again
It is restricted.It is not singly LED component, the contradiction of the power characteristic and frequency characteristic of all semiconductor devices on a device design,
Be for a long time all semiconductor device designer institute facings the problem of.There are no can take into account two for report both domestic and external at present
Aspect performance, it is contemplated that can not solve, can only improve to a certain extent in a short time.
On the basis of existing LED component, improve the response speed of system by external drive circuit, realizes that high speed is logical
Letter, common scheme are using preemphasis or equilibrium.But since the junction capacity of illuminating LED is usually larger, in the amount of nF
Grade, High-speed driving signals will generate biggish power consumption to the charge and discharge of this capacitor, to reduce shining for lighting system
Efficiency.There is presently no the schemes that one can preferably solve the problems, such as excessive power drain caused by LED junction capacitor.
In addition, pulse drive signal is used, if keeping signal peak-peak within the scope of the rated current of LED,
Average current is inevitably less than the rated operational current of LED, and brightness of illumination is caused to decline；If keeping brightness of illumination constant,
Average current need to be kept to be equal to rated operational current, i.e. rated current of the peak point current much larger than LED.Since LED is in high current
When, luminous power can approach to saturation, and cause luminous efficiency to decline, and excessive peak point current, may cause the drop of LED life
It is low.
Summary of the invention
In order to overcome the above-mentioned deficiencies of the prior art, present invention firstly provides a kind of communications based on LED high illumination efficiency
Illuminate the implementation method of sharing system.
The present invention also proposes a kind of realization device of communication illumination sharing system based on LED high illumination efficiency.
In order to solve the above technical problems, technical scheme is as follows:
A kind of implementation method of the communication illumination sharing system based on LED high illumination efficiency,
In transmitting terminal, data to be transmitted is divided into the data group of one group of the position n, pattern generator by n merging encoders
Polynary failing edge encoded signal is converted by data group, polynary failing edge encoded signal is after analog line driver amplifies, driving
LED transmitting generates optic communication signal；
In receiving end, photoelectric converter receives optic communication signal, by the judgement of comparator, recovers polynary failing edge and compiles
Code signal is decoded using decoder, obtains n-bit data group, then recover data to be transmitted by data recovery circuit.
Preferably, in transmitting terminal, when each data transmission starts, data to be transmitted signal rises to high electricity from low level
Flat, rising edge is divided into one group every n of signal to be transmitted as time reference, n merging encoders, according to every group of data
Value, exports the pulse signal of different in width, the pulse signal failing edge moment is corresponding with the value of data to be transmitted: setting the minimum of pulse
Slot time is τ, and the value of n-bit data is x, then the width of pulse is (x+1) τ.
Preferably, after n merging encoder output low levels, rise immediately, carry out the transmission of next symbol, so
The length of each code element is variation.
A kind of realization device of the communication illumination sharing system based on LED high illumination efficiency, including n merging encoders,
Pattern generator, analog line driver, LED, photoelectric converter, comparator, decoder and data recovery circuit, by data to be transmitted
It is divided into the data group of one group of the position n by n merging encoders, data group is converted polynary failing edge coding letter by pattern generator
Number, for polynary failing edge encoded signal after analog line driver amplifies, driving LED transmitting generates optic communication signal；Photoelectric conversion
Device receives optic communication signal and recovers polynary failing edge encoded signal by the judgement of comparator, decode using decoder,
N-bit data group is obtained, then data to be transmitted is recovered by data recovery circuit.
Compared with prior art, the beneficial effects of the present invention are:
1, the communication plan encoded using multi-pulse failing edge, reduces the charge and discharge number of LED junction capacitor, to subtract
Lack the power because of charge and discharge electric consumption, improves illumination efficiency；
2, the scheme fixed using low level time, improves the duty ratio of driving signal, improves brightness of illumination and LED
Service life.
Detailed description of the invention
Fig. 1 is the signal waveform schematic diagram of multi-pulse failing edge encoding scheme.
Fig. 2 is the communication process schematic diagram of multi-pulse failing edge coded system.
Fig. 3 is common LED driving schematic diagram.
Fig. 4 is the flow direction schematic diagram of electric current when the driving signal of LED is respectively high and low level.
Fig. 5 is the realization device schematic diagram of communications illuminating system.
Specific embodiment
The attached figures are only used for illustrative purposes and cannot be understood as limitating the patent；In order to better illustrate this embodiment, attached
Scheme certain components to have omission, zoom in or out, does not represent the size of actual product；
To those skilled in the art, it is to be understood that certain known features and its explanation, which may be omitted, in attached drawing
's.The following further describes the technical solution of the present invention with reference to the accompanying drawings and examples.
Basic principle of the invention is to reduce the driving voltage of LED by using multi-pulse failing edge encoding scheme
Transition times reduce because of excessive power drain caused by LED junction capacitor.Variable length symbol width is used simultaneously, is contracted as far as possible
Short the low level duration improves the duty ratio of signal, under the premise of guaranteeing that brightness of illumination is constant, reduces peak point current.
Fig. 1 is the signal waveform schematic diagram of multi-pulse failing edge encoding scheme, and the curve of top is its coding principle:
When each code element starts, signal rises to high level from low level, and rising edge is as time reference.Encoder is number to be transmitted
It is divided into one group according to every n, according to the value of every group of data, exports the pulse signal of different in width.If the minimum slot time of pulse
For τ, then the maximum width of pulse is 2n·τ.Its failing edge moment is corresponding with the value of data to be transmitted group.Receiving end is according to signal
The failing edge moment, recover the value of data to be transmitted, realize the transmission of data.
Curve below Fig. 1 is encoding examples, and the value of the 1st group of data to be transmitted is " 0 ", so pulse only takes up 1 list
The time slot width of position；The value of 2nd group of data to be transmitted is " 5 ", so pulse occupies the time slot width of 6 units；3rd group to be passed
The value of transmission of data is " 4 ", so pulse occupies the time slot width of 5 units.This waveform appears in analog power often
The combination of pulse width modulation and pulse frequency modulated scheme, but be essentially different: pulse width modulation and arteries and veins
Rushing frequency modulating technology is to indicate analog signal with digital signal, be digitally coded method is carried out to analog signal level, and
The present invention is the value with pulse falling edge or pulse width characterization binary data group, belongs to a kind of multicomponent coding mode.
Its communication process is as shown in Figure 2: data to be transmitted is divided into the data group of one group of the position n by n consolidation circuits.
Pattern generator receives data group to be transmitted, is converted to polynary failing edge encoded signal.For example, under realizing n polynary
Drop can use n digit counter to realize along coding: the counting period of counter is set as τ, the value of n data to be transmitted is k,
In each period, encoder output high level, unison counter is started counting, count value and number to be transmitted when counter
When according to being worth identical, encoder output low level, and reset count device.The output pulse width of encoder is equal to k τ in this way, just right
It should be in the value of data to be transmitted.After encoder output low level, is risen immediately with the most fast possible speed of system, carried out next
The transmission of a symbol.The output signal of pattern generator drives LED after analog line driver amplifies, and generates optic communication signal.
In receiving end, photoelectric converter receives optic communication signal, by the judgement of comparator, recovers polynary failing edge and compiles
Code signal finally decodes by decoder, obtains n-bit data group, then recover data to be transmitted by data recovery circuit.Decoding
Device can also be realized using n digit counter: in each signal rising edge, counter is started counting, and the failing edge of signal stops
It counts, count value is with regard to respective pulses width, available corresponding data to be transmitted value.
According to the principle of above scheme, this scheme power consumption caused by LED junction capacitor and brightness of illumination are analyzed respectively
The characteristic of aspect:
1, energy consumption caused by LED junction capacitor
It is common LED driving schematic diagram as shown in Fig. 3 (a), drives LED usually using the driver of a high speed.
But since the junction capacity of illuminating LED is usually larger, in the magnitude of nF, charge and discharge of the High-speed driving signals to this capacitor
Biggish power loss will be generated, to reduce the luminous efficiency of lighting system.Power consumption caused by junction capacity charge and discharge can
To be analyzed according to Fig. 3.Fig. 3 (b) is with the driving schematic diagram after the replacement of the equivalent circuit of LED, in dotted line frame is wherein LED
Equivalent circuit diagram.Because the mainly influence of research LED junction capacitor, ignores the factors such as the series resistance of LED, LED etc.
Effect is a desired illumination diode D and LED junction capacitor CLEDParallel connection.
When the driving signal of LED is respectively high and low level, the flow direction of electric current is as shown in Figure 4.Because capacitor fills
What electric discharge only occurred in signal rises or falls edge, so dividing separately below the case where signal rising edge and failing edge
Analysis:
(1) when signal rising edge, the consumption of circuit energy caused by LED junction capacitor
Fig. 4 (a) be input be high level when current direction, at this time internal drive switch S closure, power supply VHPass through drive
Dynamic device internal resistance ROSo that it is shone to ideal LED power supply, while charging to the junction capacity of LED.
The energy that power supply consumes LED junction capacitor charging is not involved in luminous, is the energy consumption of circuit.Because capacitor does not disappear
Power consumption, so actual power all consumes on driving circuit, i.e., in the internal resistance of driving circuit.The jump of driving signal rising edge
Energy consumption caused by charge and discharge to junction capacity can be calculated with formula (1):
In formula, iCFor the electric current for flowing through LED junction capacitor, vRoFor the voltage in driver internal resistance, VHFor the high electricity of driving signal
Flat voltage, vLEDFor the voltage (equal to the voltage on LED junction capacitor) on LED, trFor signal elevating time.
Electric current for flowing through LED junction capacitor is equal to:
Because the voltage of LED remains unchanged, and junction capacity does not have charge and discharge when signal keeps high level or low level,
The junction resistance of LED and the internal resistance of driver constitute simple bleeder circuit, so having:
R in formulaLEDFor the junction resistance of LED, ROFor the internal resistance of driver.Because the internal resistance of LED is interior much larger than driver
Resistance, so the voltage on LED is approximately equal to low level V before rising edgeL, the voltage after rising edge is approximately equal to VH, by formula
(2), (3) and (4) substitute into formula (1) and can obtain:
V in formulamFor the difference of low and high level.By formula (5) it is found that when signal rising edge, circuit energy caused by junction capacity
Consume it is directly proportional to the size of junction capacity, it is square directly proportional to the peak-to-peak value of driving signal.
(2) when signal failing edge, the consumption of circuit energy caused by LED junction capacitor
Fig. 4 (b) is the current direction of each section when input voltage is low level.Internal drive switch S is closed at this time
It closes, the charge that LED junction capacitor is accumulated in high level is discharged by the internal resistance of driver, and is discharged simultaneously by ideal LED, is put
Electric current is gradually reduced, and LED gradually extinguishes.So having:
It is useless for flowing through the energy of the internal resistance of driver, so circuit energy caused by junction capacity consumes are as follows:
I in formulaDThe equation followed for the electric current for flowing through desired illumination diode, the positive C-V characteristic of ideal LED are as follows:
In formula, I0For the reverse saturation current of LED, q is electronic charge, vDFor LED both end voltage, n is the material with LED
Expect constant related, between 1 to 2, k is Boltzmann constant, and T is absolute temperature.
Formula (6) and formula (8) are substituted into formula (7), when available signal failing edge, energy caused by the junction capacity of LED disappears
Consumption are as follows:
First item is the energy stored on LED junction capacitor in formula, and Section 2 is the energy of LED consumption during failing edge,
Although this portion of energy does not contribute signal of communication, for shining.Because the internal resistance of LED is interior much larger than driver
Resistance, so the energy of driver internal resistance consumption is much larger than the energy of LED consumption, energy caused by LED junction capacitor when signal failing edge
Amount, which dissipates, to be approximately equal to:
(3) when signal jumps, circuit power caused by LED junction capacitor is consumed
The consumption of circuit power caused by LED junction capacitor is equal to the energy consumption jumped every time in the unit time.Therefore, to every
The probability factor of a period jump is α, and signal frequency is the driving signal of f, according to formula (5) and (10), the charge and discharge of junction capacity
Caused power consumption are as follows:
By taking the LED of common power 1W as an example, typical junction capacity 1nF, if driving voltage switching frequency 100MHz, modulation
Voltage 3V, using (to unipolarity nonreturn to zero code α=0.5, other pattern α can be much higher) when unipolarity nonreturn to zero code, power consumption
150mW is reached, this will cause the very big reduction of luminous efficiency.If frequency is further promoted or junction capacity increases (big function
The case where rate LED), this problem will be more serious.
(4) method that circuit power caused by LED junction capacitor consumes is reduced
According to formula (11), the consumption of circuit power caused by LED junction capacitor is reduced, it can be by reducing driving signal jump
Probability, reduce clock frequency, reduce LED junction capacitor, reduce the methods of drive signal amplitude and realize.Because once LED is selected,
Its junction capacity size has just determined substantially, and in order to obtain sufficiently high signal-to-noise ratio, drive signal amplitude also must be sufficiently high, so
Most viable method is exactly the coding or modulation system by improving communication system, reduces the probability of driving signal jump, and
Reduce clock frequency.
The multi-pulse failing edge encoding scheme that the present invention uses can effectively reduce driving signal jump probability and
Clock frequency: for using n m primitive encodings, system transmitting terminal uses the rising edge of driving pulse as timing reference, according to
The data of required transmission, using m primitive encoding, each code value corresponds to different pulse falling edge positions, after driving pulse decline,
Risen immediately with the most fast possible speed of system, carries out the transmission of next symbol.
It can be seen that signal has jumped twice, transmits n bit, each of which period in a symbol time
The probability factor of jump is α=2, and signal frequency isTherefore power consumption caused by its junction capacity charge and discharge are as follows:
Therefore power consumption caused by LED junction capacitor compares basic unipolarity nonreturn to zero code signal, has been reduced to original
'sWhen n is sufficiently large, it can greatly reduce excessive power drain problem caused by LED junction capacitor.
2, brightness of illumination problem caused by pulsed drive
As previously mentioned, use pulse drive signal, if to combine brightness of illumination, luminous efficiency and LED's shines
Service life, best bet are exactly the duty ratio for improving signal.
When considering the duty ratio of signal, if the smallest low level width is tL, the slot time of failing edge difference code value
For tcThen, for n m primitive encodings, average symbol width isAverage duty ratio is
When m is sufficiently large, duty ratio levels off to 1.It can be seen that the solution of the present invention can also be improved LED drive signal
Duty ratio.
It is a kind of realization device of high illumination efficiency visible light communication lighting system of LED based, transmitting terminal as shown in Figure 5
Main n position merging encoder and pattern generator, analog line driver and LED comprising being made of FPGA.Receiving end mainly includes
The decoder and data recovery circuit that optical detector, comparator and FPGA are constituted.The n consolidation circuit and pattern generator connect
Data to be transmitted is received, polynary failing edge encoded signal is converted to, this signal drives LED after driver amplifies, and it is logical to generate light
Believe signal.In receiving end, photoelectric converter receives optic communication signal, by the examination of comparator, recovers polynary failing edge and compiles
Code signal, the decoder decoding finally constituted by FPGA, recovers signal to be transmitted.
Above-mentioned FPGA is using the EP2C5 chip of II series of altera corp cyclone-, and logic unit 4068, on piece is dynamic
State memory total bit number 119808bit, embedded 18x18 multiplier 13, on piece phaselocked loop 2.
ZHL-6A amplifier of the above-mentioned analog line driver using mimi-circuit company, passband 0.0025-500MHz,
Gain 25dB, peak power output 22dBm.
Above-mentioned LED uses the LE_CW_E2B light emitting diode of OSRAM company, rated current 700mA, luminous flux 240-
610lm。
Above-mentioned optical detector uses 1601 photoelectric converters of new port company, spectral response range 320-
1000nm, bandwidth 1GHz, rise time 400ps, equivalent input noise power 31pW, conversion gain 360/W.
Max961 comparator of the above-mentioned discriminator using Maxim, propagation delay 4.5ns, supply voltage 3-5V,
Output level is compatible with TTL and CMOS standard.
Obviously, the above embodiment of the present invention be only to clearly illustrate example of the present invention, and not be pair
The restriction of embodiments of the present invention.For those of ordinary skill in the art, may be used also on the basis of the above description
To make other variations or changes in different ways.There is no necessity and possibility to exhaust all the enbodiments.It is all this
Made any modifications, equivalent replacements, and improvements etc., should be included in the claims in the present invention within the spirit and principle of invention
Protection scope within.
Claims (4)
1. a kind of implementation method of the communication illumination sharing system of high illumination efficiency of LED based, it is characterised in that: the system packet
It includes n merging encoders, the pattern generator that multi-pulse failing edge encodes, analog line driver, LED, photoelectric converter, compare
The decoder and data recovery circuit of device, multi-pulse failing edge coding；The system uses multi-pulse failing edge coding staff
Case, data to be transmitted are divided into the data group of one group of the position n by n merging encoders；Pattern generator receives number to be transmitted
According to group, it is converted to multi-pulse failing edge encoded signal；The output signal of pattern generator is driven after analog line driver amplifies
Dynamic LED, generates optic communication signal；In receiving end, photoelectric converter receives optic communication signal, by the judgement of comparator, restores
Multi-pulse failing edge encoded signal out finally decodes by decoder, obtains n-bit data group, then extensive by data recovery circuit
It appears again data to be transmitted；
(1) using multi-pulse failing edge coding communication plan, LED junction capacitor at the charge and discharge of each code element period 2 times, from
And the power because of the junction capacity charge and discharge electric consumption of LED is reduced, improve system illumination efficiency；
(2) variable length symbol width, each code element period are used, low level only lasts for the smallest slot time, improves driving letter
Number duty ratio, to improve brightness of illumination.
2. implementation method according to claim 1, which is characterized in that be passed when each data transmission starts in transmitting terminal
Transmission of data signal rises to high level from low level, and rising edge is as time reference, and n merging encoders are signal to be transmitted
Every n is divided into one group, according to the value of every group of data, exports the pulse signal of different in width, the pulse signal failing edge moment with it is to be passed
The value of transmission of data is corresponding: set the minimum slot time of pulse as, the value of n-bit data is x, then the width of pulse is。
3. implementation method according to claim 1, which is characterized in that after n merging encoder output low levels, immediately
Rise, carry out the transmission of next symbol, so the length of each code element is variation.
4. a kind of realization device of the communication illumination sharing system based on LED high illumination efficiency, which is characterized in that closed including n
And encoder, pattern generator, analog line driver, LED, photoelectric converter, comparator, decoder and data recovery circuit, it will
Data to be transmitted is divided into the data group of one group of the position n by n merging encoders, and data group is converted polynary arteries and veins by pattern generator
Failing edge encoded signal is rushed, for multi-pulse failing edge encoded signal after analog line driver amplifies, driving LED transmitting generates light
Signal of communication；Photoelectric converter receives optic communication signal, by the judgement of comparator, recovers multi-pulse failing edge coding letter
Number, it is decoded using decoder, obtains n-bit data group, then data to be transmitted is recovered by data recovery circuit.
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| CN107231192A (en) * | 2017-02-28 | 2017-10-03 | 华南师范大学 | The data transmission method and LED visible light communication system of double level pulse widths codings |
| CN108667558B (en) * | 2017-03-31 | 2020-11-27 | 圣邦微电子（北京）股份有限公司 | Coding method suitable for transmitting short content |
| CN107782438A (en) * | 2017-11-28 | 2018-03-09 | 广西师范大学 | Optical fiber raster vibration measuring system based on pulse code and edge filter demodulation method |
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