CN105099567B - A kind of emitter of the visible light communication system based on white light LEDs - Google Patents
A kind of emitter of the visible light communication system based on white light LEDs Download PDFInfo
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- CN105099567B CN105099567B CN201510516181.8A CN201510516181A CN105099567B CN 105099567 B CN105099567 B CN 105099567B CN 201510516181 A CN201510516181 A CN 201510516181A CN 105099567 B CN105099567 B CN 105099567B
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Abstract
The invention discloses a kind of emitter of the visible light communication system based on white light LEDs, including at least one set of input circuit, modulation circuit, drive circuit and LED array；Wherein, the input circuit sends described modulation circuit to by the analog electrical signal for receiving extraneous input and by the analog electrical signal；The modulation circuit is acquired to the analog electrical signal, is then converted into data signal and is sent described drive circuit to；Finally, the drive circuit lights the LED array according to described data signal, the LED array is realized electro-optic conversion by the rule stabilized illumination of modulated signal.Therefore, during the present invention completely solves the visible light communications of existing white light LEDs, when modulated signal brownout in emitter, or when not being inconsistent with the gate drive voltages of needs, the problem of causing LED to be unable to steady operation.
Description
Technical field
The present invention relates to the communications field, particularly relates to a kind of emitter of the visible light communication system based on white light LEDs.
Background technology
At present, as shown in figure 1, the visible light communication system based on white light LEDs, emitter can turn electric signal
Optical signal is turned to, is then that optical signal is sent to reception device by free space by optical channel, last reception device can
The optical signal with certain frequency of reception is converted into raw electrical signal.Wherein, the visible light communication system based on white light LEDs
The core technology of emitter be electro-optic conversion technology, and the core of electro-optic conversion technology is LED actuation techniques.
Existing LED actuation techniques have typical triode (NPN pipes) driving, PWM control drivings, and electric capacity pressure drop drives,
IC integrated drivings.In triode drives LED technology, triode is typically to flow the device for controlling current mode, the electric current of colelctor electrode
Change with the change of the electric current of base stage.This LED type of drive has several unavoidable problems：First, the measurement of electric current
Inconvenience, and be inconvenient to adjust；Second, when base stage needs the signal of the outputs such as external other feature boards such as single-chip microcomputer, FPGA
When, electric current will carry out the amplification of very high magnification numbe, could drive triode.Because the electric current of in general feature board output is all very
Small, only milliampere magnitude can not be used directly；3rd, triode driving is typically only suitable for low power LED drivings, high-power
LED need driving current it is very big, the electric current of base stage is extremely difficult to.
In PWM controls driving LED technology, although brightness and the colour temperature of LED can be controlled well, there is several ask
Topic should be noted：First, pwm signal is either by caused by hardware or by caused by software, being required for the outer of complexity
Circuit is enclosed, cost is high, and device noise is big.Second, PWM control actuation techniques are typically also only applicable to low power LED drivings.
In electric capacity pressure drop actuation techniques, electric capacity is difficult to adjust difficult the shortcomings that measuring it is clear that in addition, electric capacity is one non-
Linear element, the processes of charging and discharging all need the regular hour, are unavoidable the problem of delay.IC integrated drivings LED
Technology, although effectively improve above-mentioned actuation techniques, TC integrated chip costs are too high, cause to popularize.
The content of the invention
In view of this, it is an object of the invention to propose a kind of transmitting dress of visible light communication system based on white light LEDs
Put, above-named type of drive in the prior art can be overcome the shortcomings of, and realize that cost is low, good linearity, while surely
Qualitative height.
Based on the emitter of the above-mentioned purpose visible light communication system provided by the invention based on white light LEDs, including extremely
Few one group input circuit, modulation circuit, drive circuit and LED array；Wherein, the input circuit will receive extraneous input
Analog electrical signal simultaneously sends the analog electrical signal to described modulation circuit；The modulation circuit is adopted to the analog electrical signal
Collection, it is then converted into data signal and sends described drive circuit to；Finally, the drive circuit is according to described data signal
The LED array is lighted, the LED array is realized electro-optic conversion by the rule stabilized illumination of modulated signal.
Alternatively, described modulation circuit includes acquisition processing module and A/D modular converters, and the acquisition processing module will
The analog electrical signal of described input circuit transmission is acquired, and is then sent to the A/D modular converters, the A/D conversions
The analog electrical signal of collection is then changed into data signal by module, and gives the digital data transmission to described drive circuit.
Further, the A/D modular converters have carried out analog electrical signal and have been changed into after data signal, and the numeral is believed
Number the acquisition processing module is returned to, then the acquisition processing module is subject to coded modulation again, is finally directly output to institute
The drive circuit stated has the carrier signal of certain dutycycle.
Further, the modulation circuit includes display screen, and the display screen is connected with the acquisition processing module, by described in
The operating result of acquisition processing module and the A/D modular converters is shown；In addition, by the display screen to the collection
The signal transacting of processing module and the A/D modular converters is controlled, assigns instruction；
Modulation circuit further comprises the system clock module being connected with the acquisition processing module, the system clock module
The time of the acquisition processing module and the A/D modular converters is controlled；In addition, the acquisition processing module and described
A/D modular converters show various time-triggered protocols in the system clock module.
Alternatively, the drive circuit includes the voltage stabilization and current stabilization that common source voltage amplifier circuit and common source on-off circuit form
LED drive circuit；Wherein, the voltage signal that the modulation module exports is amplified to common source switch electricity by common source voltage amplifier circuit
Road required voltage amplitude, then common source on-off circuit directly drive the LED array.
Further, the drain electrode of the common source voltage amplifier circuit of the drive circuit concatenates a drain resistance Rd1Form
The output resistance R of whole common source amplifying circuit0, then drain resistance Rd1DC voltage VCC2 is connected to again；Common source voltage amplification electricity
The source electrode on road concatenates a source resistance Rs1, source resistance Rs1The ground wire of circuit is connected to again；The grid of common source voltage amplifier circuit
Up and down and couple two divider resistance Rg1And Rg2Input resistance R as whole common source amplifying circuiti, described input resistance Ri
It is connected to again on the output line of modulation circuit 2；The now gain of circuit is：
gmFor FET mutual conductance, AvFor voltage gain, AvsFor source voltage gain, RisFor source voltage internal resistance, v0For output
Resistance R0Voltage, viFor input resistance RiVoltage, RdFor drain resistance, Rs is source resistance, vsFor grid voltage.
Further, the grid of the common source on-off circuit is connected to the drain electrode of corresponding common source power amplifier circuit, described common
The source electrode of source switching circuit concatenates a source resistance Rs2, then source resistance Rs2The source resistance R of source switching circuit togethers1
Altogether；The drain electrode of the common source on-off circuit concatenates a drain resistance Rd2, then drain resistance Rd2With described LED array
Series connection, is finally connected to D.C. regulated power supply VCC1 again；The grid of the common source on-off circuit is obtained through common source power amplifier circuit
Modulated signal after amplification, driving FET make on-off circuit produce saturated drain current IDSS, then flow through LED array
Electric current：
rdsFor the mutual conductance of FET, in saturation region rdsFor infinity.
Alternatively, the LED array of the emitter includes at least two LED pixels, and uses parallel way.
Further, the P electrode of each LED pixel is connected to corresponding D.C. regulated power supply VCC, described each
The drain electrode of the corresponding common source on-off circuit of N electrode connection of LED pixel.
Further, word, music, video analog signal are input in the modulation circuit by described input circuit.
From the above it can be seen that the emitter of the visible light communication system provided by the invention based on white light LEDs,
Modulation circuit by the analog electrical signal for receiving extraneous input and to is sent the analog electrical signal by input circuit；Modulation electricity
Road is acquired to the analog electrical signal, is then converted into data signal and is sent drive circuit to；Finally, the drive circuit root
LED array is lighted according to data signal, LED array is realized electro-optic conversion by the rule stabilized illumination of modulated signal.So as to institute
State the emitter of the visible light communication system of the LED based on white light and can completely solve the visible rays of existing white light LEDs and lead to
During letter, when modulated signal brownout in emitter, or when not being inconsistent with the gate drive voltages of needs, LED is caused
Lamp is unable to the problem of steady operation.
Brief description of the drawings
Fig. 1 is the structural representation of the visible light communication system based on white light LEDs in the prior art；
Fig. 2 is the structural representation of the emitter of visible light communication system of the embodiment of the present invention based on white light LEDs；
Fig. 3 is the structural representation of modulation circuit of the embodiment of the present invention；
Fig. 4 is the structural representation of drive circuit of the embodiment of the present invention；
Fig. 5 is the structural representation of LED array of the embodiment of the present invention.
Embodiment
For the object, technical solutions and advantages of the present invention are more clearly understood, below in conjunction with specific embodiment, and reference
Accompanying drawing, the present invention is described in more detail.
In one embodiment of the invention, as shown in Fig. 2 leading to for visible ray of the embodiment of the present invention based on white light LEDs
The structural representation of the emitter of letter system.The emitter of the visible light communication system based on white light LEDs includes：It is defeated
Enter circuit 1, modulation circuit 2, drive circuit 3 and LED array 4.Wherein, input circuit 1 can will receive the simulation of extraneous input
Electric signal simultaneously sends the analog electrical signal to modulation circuit 2, and modulation circuit 2 is acquired to the analog electrical signal, Ran Houzhuan
It is changed to data signal and sends drive circuit 3 to.Afterwards, drive circuit 3 lights LED array 4 according to described data signal, makes
The LED array 4 presses the rule stabilized illumination of modulated signal, realizes electro-optic conversion.
It is preferred that the LED in the LED array 4 is a current device in itself, the size of current flowed through directly determines
LED luminosity.For optical communication system, LED luminosity directly influences transmission speed and the reception of signal
Sensitivity.Preferably, the LED normal luminous in LED array 4 is made, it is necessary to assure voltage stabilization and current stabilization drives.
It should be noted that described input circuit 1 analog signals such as word, music, video can be input to it is described
In modulation circuit 2.It is preferred that input circuit 1 is to be connected on pinboard to form using data line.
In addition, what deserves to be explained is, the emitter of the visible light communication system of the present invention based on white light LEDs can
To be to comprise at least a drive circuit 3 of modulation circuit 2, one of input circuit 1, one and a LED array 4.It is superincumbent
The emitter is only illustrated in embodiment includes one group of foregoing circuit, and certain emitter can also include two
Group, three groups or more foregoing circuits.
In another embodiment of the present invention, as shown in fig.3, described modulation circuit 2 includes acquisition processing module
201 and A/D modular converters 202.The analog electrical signal that input circuit 1 transmits can be acquired by acquisition processing module 201, so
After be sent to A/D modular converters 202, the analog electrical signal of collection is then changed into data signal by A/D modular converters 202, and will
The digital data transmission is to drive circuit 3.
Preferably, A/D modular converters 202 have carried out analog electrical signal and have been changed into after data signal, can be by the numeral
Signal returns to acquisition processing module 201, and then acquisition processing module 201 is subject to coded modulation again, is finally directly output to drive
Dynamic circuit 3 has the carrier signal of certain dutycycle, such as 010101 sequence.Therefore, modulation circuit 2 of the present invention can
Change the frequency of signal by adjusting dutycycle, control the bright dark switching rate of the LED array 4, the whole communication of control actually
The transmission rate of system.Moreover, the frequency of carrier signal that modulation circuit 2 exports can reach more than 1MHZ, i.e. transmission rate can be with
Reach more than 1Mbpt.
What deserves to be explained is acquisition processing module 201 and A/D modular converters 202, which can use, data acquisition and conversion
The microprocessor chip of function, the crystal oscillator frequency of its microprocessor chip are not less than 16MHZ, it is possible to achieve data acquisition process and
A/D is changed；From PPW (pulse position width) modulation system, the lasting width of high level " 1 ", when representing that LED array is lighted
Between, the lasting width of low level " 0 ", represent the time that LED array is extinguished.The modulation circuit structure and modulation methods that the present invention uses
Formula is not limited to the modulation circuit structure and modulation system that Fig. 3 is provided.
It is preferred that modulation circuit 2 can also include display screen 203.The display screen 203 is connected with acquisition processing module 201,
The operating result of acquisition processing module 201 and A/D modular converters 202 can be shown.Furthermore it is possible to pass through display screen
The signal transacting of 203 pairs of acquisition processing modules 201 and A/D modular converters 202 is controlled, assigns instruction.
As one embodiment, modulation circuit 2 further comprises the system clock module being connected with acquisition processing module 201
204.Described system clock module 204 can be controlled to the time of acquisition processing module 201 and A/D modular converters 202,
Such as：Timesharing control, timing, timestamp etc..In addition, acquisition processing module 201 and A/D modular converters 202 can be when will be various
Between handle and shown in system clock module 204.
As one embodiment of the present of invention, as shown in fig.4, drive circuit 3 is designed as common source voltage in embodiment
The LED drive circuit of the voltage stabilization and current stabilization of amplifying circuit and common source on-off circuit composition.Wherein, common source voltage amplifier circuit will be modulated
The voltage signal of module output is amplified to common source on-off circuit required voltage amplitude, you can with by voltage amplification.Then, common source
On-off circuit directly drives LED array 4, and LED is lit when condition reaches, and when condition does not reach, LED extinguishes.Need
Illustrate, because the grid of common source on-off circuit needs sufficiently large voltage drain electrode is produced appropriate electric current, ensure
LED normal works.So need to connect common source voltage amplifier circuit before common source on-off circuit.
It is preferred that common source voltage amplifier circuit and common source on-off circuit built by FET and some passive resistances and
Into.Preferably, the power and current requirements of the LED array 4 needed according to the present invention, common source voltage amplifier circuit and common source switch
FET in circuit selects the FET of voltage control electric current type.
As an alternative embodiment of the invention, the drain electrode of the common source voltage amplifier circuit of drive circuit 3 concatenates a leakage
Electrode resistance Rd1Form the output resistance R of whole common source amplifying circuit0, then drain resistance Rd1DC voltage VCC2 is connected to again.Altogether
The source electrode of source voltage amplifier circuit concatenates a source resistance Rs1, source resistance Rs1The ground wire of circuit is connected to again.Common source voltage is put
The grid of big circuit up and down and couples two divider resistance Rg1And Rg2Input resistance R as whole common source amplifying circuiti(Ri=
Rg1//Rg2), described input resistance RiIt is connected to again on the output line of modulation circuit 2.The now gain of circuit is：
gmFor FET mutual conductance, AvFor voltage gain, AvsFor source voltage gain, RisFor source voltage internal resistance, v0For output
Resistance R0Voltage, viFor input resistance RiVoltage, RdFor drain resistance, Rs is source resistance, vsFor grid voltage.
It is preferred that the grid of common source on-off circuit is connected to the drain electrode of corresponding common source power amplifier circuit.Common source on-off circuit
Source electrode concatenate a source resistance Rs2, then source resistance Rs2The source resistance R of source switching circuit togethers1Altogether.Common source is opened
The drain electrode on powered-down road concatenates a drain resistance Rd2, then drain resistance Rd2Connect with described LED array 4, be finally connected to again
D.C. regulated power supply VCC1.Preferably, drain resistance Rd2To be adjustable.The grid of common source on-off circuit is obtained through common source power supply
Modulated signal after amplifying circuit amplification, driving FET make on-off circuit produce saturated drain current IDSS, then flow through
The electric current of LED array 4：
rdsFor the mutual conductance of FET, in saturation region rdsFor infinity.
As one embodiment of the present of invention, as shown in figure 5, the structural representation for LED array of the embodiment of the present invention.Institute
Stating the LED array 4 of emitter includes at least two LED pixels, and uses parallel way.It is preferred that the work(of the LED pixel
Rate is 1W, electric current 350mA.Preferably, the P electrode of each LED pixel is connected to corresponding D.C. regulated power supply VCC, each
The drain electrode of the corresponding common source on-off circuit of N electrode connection of LED pixel.
In summary, the emitter of the visible light communication system provided by the invention based on white light LEDs, is creatively carried
Having gone out one kind has voltage stabilization and current stabilization driving function, the emitter for having high switching rate again；At the same time, the present invention considers
Cost, operability, performance, stability, linear and voltage stabilization and current stabilization factor, it is especially set out be related to put using common source pole tension
Big FET driving LED emitter, realize switching rate (can reach more than MHZ up to a hundred switching speed soon
Rate), the advantages that circuit structure is simple.
Moreover, LED emitter LED P electrode is driven to connect direct current using the FET of common source voltage amplification
The drain electrode of voltage-stabilized power supply VCC, LED N electrode connection FET, one resistance of drain series of FET, FET
Source electrode concatenates a protective resistance and then is grounded, fet gate connection modulated signal；When the voltage of modulated signal is more than field
During the threshold voltage of effect pipe, FET conducting, voltage-stabilized power supply VCC power supplies make circuit produce electric current, and LED is lit, with
The rule of modulated signal carries out bright dark switching, so as to realize that electric signal is converted into optical signal；FET now is equivalent to
One current-stabilizing switch power source, the advantages of FET actuation techniques：First, the conducting resistance very little of FET is general to only have
Several milliohms are to tens milliohms, the voltage very little dropped on FET, conduction loss very little；Second, FET is most notable
Characteristic be that switching characteristic is good because conducting resistance is small, turn-on rate is fast, and the switching rate of switch is high；3rd, FET is
Voltage control electric current type FET, the size of FET drain electric current depend on the big of the voltage of added modulated signal
It is small.When the modulated signal voltage driving FET for being added in fet gate, saturated drain current, direct-flow voltage regulation source are produced
The maximum current that VCC is provided is exactly described saturated drain current, this ensure that LED luminance, considerably increases driving force,
Improve utilization rate of electrical.
Further, the LED drive device of voltage stabilization and current stabilization, common source are formed using common source voltage amplifier circuit and common source on-off circuit
Voltage amplifier circuit and common source on-off circuit are built by FET and some passive resistances, the most significant spy of FET
Property is exactly that characteristic of opening the light is good, is typical voltage control electric current type device, has an advantage in that to be exactly that pin is few in addition, peripheral circuit
It is simple easily to realize, avoid the positive and negative operating voltage that conventional amplifier is additionally required, it is not necessary to extra chip power supply voltage；Most
Afterwards, the emitter of the whole described visible light communication system based on white light LEDs is easy, compact, it is easy to accomplish.
Those of ordinary skills in the art should understand that：The specific embodiment of the present invention is the foregoing is only, and
The limitation present invention is not used in, within the spirit and principles of the invention, any modification, equivalent substitution and improvements done etc.,
It should be included within protection scope of the present invention.
Claims (5)
1. a kind of emitter of the visible light communication system based on white light LEDs, it is characterised in that include the input of at least one set
Circuit, modulation circuit, drive circuit and LED array；Wherein, the input circuit will receive the analog electrical signal of extraneous input simultaneously
The analog electrical signal is sent to described modulation circuit；The modulation circuit is acquired to the analog electrical signal, is then changed
For data signal and send described drive circuit to；Finally, the drive circuit lights the LED according to described data signal
Array, the LED array is set to realize electro-optic conversion by the rule stabilized illumination of modulated signal；
Described modulation circuit includes acquisition processing module and A/D modular converters, and the acquisition processing module is by described input
The analog electrical signal of circuit transmission is acquired, and is then sent to the A/D modular converters, the A/D modular converters will then be adopted
The analog electrical signal of collection is changed into data signal, and gives the digital data transmission to described drive circuit；
The modulation circuit includes display screen, and the display screen is connected with the acquisition processing module, by the acquisition processing module
It is shown with the operating result of the A/D modular converters；In addition, by the display screen to the acquisition processing module and institute
The signal transacting for stating A/D modular converters is controlled, assigns instruction；
Modulation circuit further comprises the system clock module being connected with the acquisition processing module, and the system clock module is to institute
The time for stating acquisition processing module and the A/D modular converters is controlled；In addition, the acquisition processing module and the A/D
Modular converter shows various time-triggered protocols in the system clock module；
The drive circuit includes the LED driving electricity for the voltage stabilization and current stabilization that common source voltage amplifier circuit and common source on-off circuit form
Road；Wherein, the voltage signal that the modulation module exports is amplified to common source on-off circuit needs by common source voltage amplifier circuit
Voltage amplitude, then common source on-off circuit directly drive the LED array；
The drain electrode of the common source voltage amplifier circuit of the drive circuit concatenates a drain resistance Rd1Form whole common source amplification electricity
The output resistance R on road0, then drain resistance Rd1DC voltage VCC2 is connected to again；The source electrode concatenation one of common source voltage amplifier circuit
Individual source resistance Rs1, source resistance Rs1The ground wire of circuit is connected to again；The grid of common source voltage amplifier circuit up and down and couple two
Divider resistance Rg1And Rg2Input resistance R as whole common source amplifying circuiti, described input resistance R is connected to modulation circuit 2 again
Output line on；The now gain of circuit is：
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gmFor FET mutual conductance, AvFor voltage gain, AvsFor source voltage gain, RisFor source voltage internal resistance, v0For output resistance R0
Voltage, viFor input resistance RiVoltage, RdFor drain resistance, Rs is source resistance, vsFor grid voltage；
The grid of the common source on-off circuit is connected to the drain electrode of corresponding common source power amplifier circuit, the source of the common source on-off circuit
Pole concatenates a source resistance Rs2, then source resistance Rs2The source resistance R of source switching circuit togethers1Altogether；The common source is opened
The drain electrode on powered-down road concatenates a drain resistance Rd2, then drain resistance Rd2Connect with described LED array, be finally connected to again
D.C. regulated power supply VCC1；The grid of the common source on-off circuit obtains the modulation letter after the amplification of common source power amplifier circuit
Number, driving FET makes on-off circuit produce saturated drain current IDSS, then flow through the electric current of LED array：
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rdsFor the mutual conductance of FET, in saturation region rdsFor infinity.
2. emitter according to claim 1, it is characterised in that the A/D modular converters have carried out analog electrical signal
It is changed into after data signal, the data signal is returned into the acquisition processing module, then the acquisition processing module is again
It is subject to coded modulation, being finally directly output to described drive circuit has the carrier signal of certain dutycycle.
3. emitter according to claim 1, it is characterised in that the LED array of the emitter includes at least two
Individual LED pixel, and use parallel way.
4. emitter according to claim 3, it is characterised in that the P electrode of each LED pixel is connected to correspondingly
D.C. regulated power supply VCC, the drain electrode of the corresponding common source on-off circuit of N electrode connection of each LED pixel.
5. emitter as claimed in any of claims 1 to 4, it is characterised in that described input circuit is by text
Word, music, video analog signal are input in the modulation circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510516181.8A CN105099567B (en) | 2015-08-20 | 2015-08-20 | A kind of emitter of the visible light communication system based on white light LEDs |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510516181.8A CN105099567B (en) | 2015-08-20 | 2015-08-20 | A kind of emitter of the visible light communication system based on white light LEDs |
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| CN105429704A (en) * | 2015-11-30 | 2016-03-23 | 上海航天测控通信研究所 | Visible light modulation system for visible light communication |
| CN105611677B (en) * | 2016-03-03 | 2018-11-06 | 威宇（北京）光电技术有限公司 | A kind of downlink communication system with ACLED lighting sources |
| CN109089351A (en) * | 2018-10-18 | 2018-12-25 | 上海灿瑞科技股份有限公司 | A kind of LED drive power chip |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2007011373A (en) * | 2005-06-30 | 2007-01-18 | Lg Phillips Lcd Co Ltd | Electroluminescence device |
| CN102801473A (en) * | 2012-08-06 | 2012-11-28 | 南京邮电大学 | Visible light video communication system based on digital signal processing |
| CN103532625A (en) * | 2013-10-14 | 2014-01-22 | 江苏大学 | White-light LED (light-emitting diode) speech signal communication transceiving system |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2007011373A (en) * | 2005-06-30 | 2007-01-18 | Lg Phillips Lcd Co Ltd | Electroluminescence device |
| CN102801473A (en) * | 2012-08-06 | 2012-11-28 | 南京邮电大学 | Visible light video communication system based on digital signal processing |
| CN103532625A (en) * | 2013-10-14 | 2014-01-22 | 江苏大学 | White-light LED (light-emitting diode) speech signal communication transceiving system |
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