CN103166904A - Method and system of parallel emission of multichannel carrier light signals - Google Patents
Method and system of parallel emission of multichannel carrier light signals Download PDFInfo
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Abstract
The invention discloses a method and a system of parallel emission of multichannel carrier light signals. The system drives a direct numerical frequency synthesizer chip to generate a square signal through intellectualized control of a control terminal, wherein frequency and phase positions of the square signal are continuous and controllable, and the system outputs the square signal to control a light emitting diode (LED) to flicker in fixed frequency. During the working process of the LED, an LED drive module and an optical feedback module act together and enable the LED to output carrier light signals which are stable in power in long power mode, the optical feedback module feeds received LED power instability fluctuation back by using a photovoltaic conversion diode and restrains power fluctuation by being combined with the LED drive module, and furthermore the multichannel carrier light signals which are controllable in frequency and phase position are generated by arranging a multichannel square signal generator and an LED module in parallel. The whole system is intelligent and controllable, high in integration level, low in power consumption, stable and reliable in work, and wide in application scope, can be extended in multiple channels, and is an integrated carrier light generating system.
Description
Technical field
The present invention relates to launching technique and the system of light signal, relate in particular to parallel launching technique and the system of multichannel carrier light signal.
Background technology
Along with the development of photoelectric technology, light signal is more and more as the occasion of carrier signal, for example needs multichannel carrier light to launch simultaneously in parallel spectrum detection technique, enters material to be checked, and carries material relevant information to be checked and be sent to receiving terminal.The frequency of this multipath light signal transmitting-receiving scheme to multipath light signal, phase place and degree of stability have higher requirements.For another example, optical communication is the major way of future communications, send useful signal with light wave as information carrier, carrier wave light is being born vital effect as the carrier wave in optical signal modulation, no matter that useful signal with electrical signal form is converted to light signal and directly sends, or useful signal is modulated on the carrier wave light signal sends, light emission module is all the core link of whole system.In wireless communications application, signal is propagated in air with form of light waves, is sent to receiving terminal, and the generation of light wave also plays a crucial role in communication process as mentioned above.
Carrier wave light is used so extensively, and as the signal source of above-mentioned application scenario, the quality of its performance has directly determined the service behaviour of application system, and the emission of stabilized carrier light is very important.In existing carrier wave light radiation pattern, also there is no at present a kind of strong carrier wave light emission system of strong adaptability, autgmentability for the various application occasions design, existing carrier wave light emission system mainly relies on signal generator transmit square waves modulation signal, control laser or semiconductor laser LD (Laser Diode with square-wave signal, LD) emission carrier wave light signal, this system has following shortcoming:
(1) tranmitting frequency is single: generally for stationary applications occasion design tranmitting frequency, the carrier wave optical signal frequency relies on signal generator and produces existing carrier wave photosystem, is only applicable to stationary applications occasion designed system, and inconvenience loads on other operational environments.
(2) light path is single: different carrier wave light application scenarios requires to be confined to self-demand to the light path number, and existing system is difficult to reply when the situation of needs expansion light path.
(3) frequency switching problem: general carrier wave light emission system frequency is fixed, inconvenience is regulated, minority frequency adjustable system exists phase place discontinuous when switching frequency, switch speed is slower, the problems such as certain delay are arranged, not being suitable for needs quick switching frequency, and requires the continuous occasion of phase place when switching.
(4) the carrier wave light emitting power is unstable: carrier wave light is stable of crucial importance as its transmitting power of light signal, existing system generally relies on the circuit control power outputs such as constant current driving, there is certain current drift in the LED driver module, the performance of luminescent device own can not guarantee not produce instantaneous saltus step in the stable situation of drive current in addition, and overall performance has much room for improvement.
(5) portable poor: existing carrier wave photosystem integrated level is low, and consideration is module integrated with all, and volume own is larger, and is portable low.
(6) intelligent degree is low: can not accomplish intellectuality during the work of carrier wave photosystem, adjustment process is comparatively complicated, relies on manual adjustments, and it is convenient not to use.
(7) power consumption is high: signal generator itself needs 220V voltage, and is larger for electrical power consumed, and luminescent device adopts laser and LD more, and power dissipation ratio LED is high, environmental protection and energy saving not.
In a word, existing carrier wave light emission system design work pattern is single, switch speed is low, phase place is discontinuous, optional tranmitting frequency is less, the light path autgmentability is poor, whole portability is low, power consumption is high, not environmental protection, though can deal with certain application scenario, adaptability is not high, and intelligent degree is low.
Summary of the invention
For the problems referred to above, in the urgent need to developing a kind of parallel launching technique and system of multichannel carrier light signal.
Thus, the present invention proposes following thinking and solves the problems referred to above, the present invention relates to a kind of parallel emission system of multichannel carrier light signal, comprises square wave generation module, LED driver module, light feedback module, control terminal module, wherein
At least two prescription ripple generation modules, wherein each prescription ripple generation module comprises that a Direct Digital frequency synthesis (Direct Digital Synthesizer, DDS) chip and chip periphery circuit produce one road square-wave signal;
At least two group LED driver modules, wherein each group comprises a LED Light-Emitting Diode and relevant connection circuit, mates to realize respectively the output of LED light signal with the square wave generation module of corresponding group;
At least two group light feedback modules, wherein each group comprises opto-electronic conversion diode, operational amplifier, and the relevant connection circuit, the light signal of the corresponding group of reception LED driver module is exported the light signal of LED driver module is exported and is realized FEEDBACK CONTROL respectively;
The control terminal module comprises single-chip microcomputer, SCM peripheral circuit, single-chip microcomputer control program and control inputs interface infrared remote control module, is used for the output of each prescription ripple generation module is controlled.
Preferably, described at least two group LED driver modules can be adjusted LED unstable wave kinetic power according to the feedback signal that correspondence is organized light feedback module output, make corresponding group LED driver module with the carrier wave light signal of long power mode stable output power.
Preferably, also comprise at least two group high-speed switching circuit modules, described each group high-speed switching circuit module realizes that the fast and stable of LED flicker switches between the square-wave signal module and LED driver module of correspondence group.
In addition, the invention still further relates to a kind of parallel launching technique of multichannel carrier light signal, comprise following steps:
Realize overall intellectuality control by the control terminal module, drive the Direct Digital Frequency Synthesizers chip and produce square-wave signal, this square wave signal controlling LED is glimmering with fixed frequency under the monitoring of light feedback module and under the control of LED driver module.
In addition, the invention still further relates to a kind of parallel launching technique of multichannel carrier light signal, comprise following steps:
Under the control of control terminal module, at least two prescription ripple generation modules produce one road square-wave signal separately;
Described each road square-wave signal is controlled the one group of LED driver module of correspondence at least two group LED driver modules, realizes the output of each paths of LEDs light signal;
The output of the LED light signal of the corresponding group of light feedback module monitoring of the correspondence group at least two group light feedback modules, and correspondence group LED driver module is carried out FEEDBACK CONTROL.
Preferably, described square-wave signal frequency and phase place are controlled continuously, and driving LED is glimmered with fixed frequency.
Preferably, described square-wave signal is controlled LED, glimmer with constant power under the control of light feedback module and LED driver module, the light feedback module adopts the opto-electronic conversion diode with the LED power erratic fluctuations feedback that receives, the LED driver module makes it with the carrier wave light signal of long power mode stable output power according to the fluctuation of LED power erratic fluctuations Modulating Power.
Preferably, described method can be carried out multichannel carrier light emission expansion according to the different application occasion, described expanded function is based on the program updates of control module and the connectivity scenario of each independent path, and path expansion number is not limit, but each independent path connected mode is constant.
The present invention has the following advantages owing to taking above technical scheme:
1, electric impulse signal produces: DDS adopts digital technology, it has following advantage: (1) frequency inverted is fast: DDS is without any feedback element, frequency switching time changes the time by the FREQUENCY CONTROL word state and circuit delay time determines, change-over time very short (I reach 400ns); (2) frequency resolution is high, and the frequency number is many: the resolution of DDS output frequency and frequency number increase with the figure place exponentially of phase accumulator, and little hertz of resolution can satisfy fine frequency and control requirement; (3) phase place is continuous: DDS only needs to change frequency control word, and does not change original phase-accumulated value when changing frequency, and therefore phase drift is little when frequency shift; (4) phase noise is little: the DDS phase noise depends primarily on the phase noise of reference source, if the reference clock source phase noise is little, the frequency plot noise of DDS generation is also little so; (5) control easily, reliable and stable.
The above-mentioned advantage of DDS determines that directly the square-wave signal of native system has the characteristics such as frequency stabilization, frequency is many, phase noise is little, phase place is continuous, control is convenient, so carrier wave light of the present invention is widely used, and applicability is strong.
2, the LED constant current drives: the present invention adopts the current regulator diode driving LED, and the current regulator diode integrated level is high, strong adaptability, and stability is remarkable, realizes simple circuit, and electric current and voltage control only need rely on the connection in series-parallel of a plurality of current regulator diodes to realize.
3, LED light feedback: the light feedback module gathers the unstable light signal that LED driver module instantaneous noise produces, be translated into the signal of telecommunication and feed back to drive circuit, luminous power is finely tuned, make LED utilizing emitted light signal power constant, so system can be used for utilizing carrier wave light as measurement means and to the demanding occasion of carrier wave optical power stability.
4, high-speed switching circuit: high-speed switching circuit is connected square wave signal of telecommunication generation module and LED driver module, overcomes the shortcomings such as operating lag that the LED driver module may exist, and makes final carrier wave light signal duty ratio stable, and frequency is high, can be applicable to the high frequency occasion.
5, control terminal is controlled a plurality of light paths: control terminal machine programmable operations DDS chip generation multichannel independence square-wave signal, every road signal is mutually fully independent, can be used to control LED and realize that different frequency carrier wave light signal occurs, and each road square-wave signal can be realized according to the programming of different application demand the switching of frequency, when using single-chip microcomputer as control module, can add infrared remote control incoming frequency and phase place, and make system realize miniaturization, intelligent, simple to operate easy-to-use, debug the advantages such as quick and convenient.
6, multichannel carrier light occurs: in the present invention, the corresponding DDS chip of one road carrier wave light according to the different application occasion, can be expanded light path as required.Only need respective optical path is arranged, can produce the wanted carrier light signal, and integrate multiple signals by control terminal, autgmentability is strong, and expansion is convenient easily to be realized, is applicable to the emission of multichannel carrier wave optical signal modulation and multichannel light signal.
Description of drawings
For further illustrating structure of the present invention, feature and purpose thereof, the present invention is described in detail below in conjunction with accompanying drawing and preferred embodiment, wherein:
Fig. 1 is the whole theory diagram of the parallel transmitter module of multichannel carrier light of the present invention;
Fig. 2 is the catenation principle block diagram of speed-sensitive switch of the present invention, LED constant current and light feedback module;
Fig. 3 be square-wave signal generation module of the present invention and with the catenation principle block diagram of control terminal;
Fig. 4 is that multichannel carrier light expanded function of the present invention realizes theory diagram.
Embodiment
For making the purpose, technical solutions and advantages of the present invention clearer, below in conjunction with specific embodiment, and with reference to accompanying drawing, the present invention is described in further detail.
As shown in Figure 1, native system is divided into lower module: square wave generation module, LED driver module, light feedback module, control terminal module are described in detail as follows:
1, carrier wave light is born and loaded other useful light signal tasks, and is very high to its performance requirement in application.Therefore carrier wave light square wave frequency and duty ratio must be stablized and accurate, and this requirement not only is embodied in transmitting terminal, and for any receiving terminal, stable frequency and duty ratio are all necessary to conversion and the demodulation of later stage signal.Square wave generation module of the present invention adopts DDS to produce square wave as electric impulse signal, DDS is a kind of frequency synthesizer of total digitalization, and after given reference clock frequency, output signal frequency only depends on frequency control word, not disturbed by other factors, the application scenario is extensive.
2, in the LED driver module, LED is responsible for electric impulse signal is converted into light signal to realize the transmission of light signal, the field such as that LED is widely used in is backlight, signal demonstration, illumination, has volume little, low in energy consumption, the life-span is long, is convenient to regulation and control and the characteristics such as pollution-free.LED is current drives, and its power output directly is decided by current strength, and luminous efficient, even for guaranteeing LED, the LED drive source should be constant current output.Current LED drive circuit design majority exists circuit complicated, the not high and circuit cost high of efficient.The LED drive circuit of the present invention's design adopts current regulator diode, current regulator diode forward conduction, output constant current, oppositely cut-off, no-output.As long as in place in circuit, the constant current purpose can be realized in the loop on request.
3, all there is instantaneous noise in any circuit, and is as the same for the LED constant-current driven module.When occasion that carrier wave light is applied to optical power stability is had relatively high expectations, this point has just determined the service behaviour of system.Unstable to the influence of peak current so that LED luminous power in order to prevent instantaneous noise, the present invention adds the light inlet feedback module, and unstable optical signal feedback to the LED driver module, is finely tuned electric current, guarantees the stable of LED luminous power.
The factors such as 4, consider that carrier wave light may be applied to the high frequency occasion, LED driver module response speed may cause the drift of final optical signal frequency and square-wave signal delay, and level switching time is long.The present invention adds the high-speed switching circuit module between square-wave signal module and LED driver module, realize that the fast and stable of LED flicker switches, and is fit to high frequency carrier light and occurs, and the light signal duty ratio is stable, and between high-low power, switch speed is fast, postpones short.
5, in order to enlarge the application scenario of native system, the present invention utilizes the programmable features of DDS chip, adopt single-chip microcomputer and computer as host computer to DDS chip write frequency and phase control words, realize that square wave instant, that phase place is continuous switches and multiple paths of square signals produces, need to be applicable to the occasion of a plurality of photo-signal channels, to realize the output of multichannel carrier light.
As shown in Figure 2, the present invention adopts square-wave signal control LED light source to glimmer with fixed frequency, produces wanted carrier light.square-wave signal is produced by the DDS chip, the AD7008 of Analog Devices company for example, AD9833, AD0952 etc., DDS connection external crystal-controlled oscillation source, to the external crystal-controlled oscillation frequency division, programming writes DDS control bit OPBITEN makes it put 1, DDS can export the MSB of its DAC data, this signal is the square wave form, concrete frequency and phase information load particular value by the required frequency respective frequencies of calculative determination control word to DDS chip frequency control register, produce the square-wave signal of fixed frequency, and utilize the phase control register of DDS chip, write the particular phases control word, the demand for control of realization to phase place.In whole square wave generating process, FREQUENCY CONTROL register and phase control register can be reset at any time, to load different frequency control words and phase control words, whole transfer process is as long as external crystal-controlled oscillation is reliable and stable, the square-wave signal that occurs can accomplish that phase place is continuous, frequency stabilization, frequency resolution is high.
Square-wave signal is controlled high-speed switching circuit, responds fast in order to control LED, and stable flicker, high-speed switching circuit adopts the speed-sensitive switch triode, and base stage connects square-wave signal, and emitter grounding, collector electrode connect power supply and respective load.When the square wave low level arrived, triode emitter-base bandgap grading and collector electrode disconnected, and the loading of power supply institute can't ground connection, and the loop is obstructed, and the load no current passes through; When the square wave high level arrives, triode emitter-base bandgap grading and collector electrode conducting, power supply institute's loading loop conducting, there is electric current to pass through in circuit, load is started working, and high speed triode fast response time can be converted to loaded work piece and halted state with as far as possible little delay with square-wave signal.
Above-mentioned speed-sensitive switch load access LED driver module, square-wave signal can be controlled the work of LED driver module and stop, and realizing the LED flicker, and luminous power is constant during flicker.The LED driver module utilizes current regulator diode and LED series connection form, if the required electric current of LED can increase drive current by a plurality of current regulator diodes in parallel greatly.The circuit side connector case is simple, and integrated level is high, and power consumption is little.
LED sends light signal and also will feed back through the light feedback module, LED sends the collection of optical signals PD photoelectric conversion tube, the PD pipe converts the light signal that gathers to the signal of telecommunication, take back the LED driver module through feedback circuit, to LED driver module current feedback, detailed process is as follows: in feedback module, metal-oxide-semiconductor and LED are in parallel, shunting current regulator diode electric current, the drift of LED utilizing emitted light exceeds when setting operating current, PD converts this light signal to current signal and controls metal-oxide-semiconductor shunting increase by feedback loop, the LED electric current is got back to normal value like this, when the LED utilizing emitted light drifts about lower than the setting operating current, PD is with this signal back metal-oxide-semiconductor, feedback loop is controlled the metal-oxide-semiconductor shunting and is reduced, the LED shunting increases gets back to operating current, so just, realized LED utilizing emitted light power invariability, light signal is directly fed back to drive circuit, need not depend on the performance of constant-current circuit, whole emission process is reliable and stable.
As shown in Figure 3, control terminal of the present invention adopts PC to write serial communication program and be loaded on single-chip microcomputer, utilize microcontroller serial port to connect DDS chip controls register port, the DDS chip is write required frequency and phase control words, and enable the DDS chip and begin to occur square-wave signal.
As shown in Figure 4, because single-chip microcomputer has multichannel IO port, microcontroller serial port RX and DX termination can be entered the SCLK of DDS and SDATA end respectively as data write clock signal path and the data signal path of DDS chip, other IO ports enable control port as the FYNC that Enable Pin is connected to the DDS chip, the writing and stop of control frequency and phase data.Consider the expansion that multichannel occurs, a plurality of DDS chips share RX and DX ports share data transmission path and the data tranmitting data register path of a single-chip microcomputer, and each DDS accesses respectively No. one single-chip microcomputer IO interface, just control corresponding DDS chip square wave by program control IO interface level and enable, the multichannel DDS chip controls of form-separating when realizing.Only need a slice single-chip microcomputer just can control a plurality of DDS chips different frequencies occurs, also can utilize coding and decoding circuit to whole DDS Enable Pin geocoding when the IO mouth is not enough, single-chip I/O mouth enables corresponding DDS by the programming addressing, so just, can according to different occasion spread signal paths, realize the multichannel expanded function.
Above-described specific embodiment; purpose of the present invention, technical scheme and beneficial effect are further described; be understood that; the above is only specific embodiments of the invention; be not limited to the present invention; within the spirit and principles in the present invention all, any modification of making, be equal to replacement, improvement etc., within all should being included in protection scope of the present invention.
Claims (13)
1. the parallel emission system of a multichannel carrier light signal, comprise square wave generation module, LED driver module, light feedback module, control terminal module, wherein
At least two prescription ripple generation modules, wherein each prescription ripple generation module comprises that a Direct Digital frequency synthesis chip and chip periphery circuit produce one road square-wave signal;
At least two group LED driver modules, wherein each group LED driver module comprises a LED Light-Emitting Diode and relevant connection circuit, mates to realize respectively the output of LED light signal with the square wave generation module of corresponding group;
At least two group light feedback modules, wherein each group light feedback module comprises opto-electronic conversion diode, operational amplifier, and the relevant connection circuit, the light signal of the corresponding group of reception LED driver module is exported the light signal of LED driver module is exported and is realized FEEDBACK CONTROL respectively;
The control terminal module comprises single-chip microcomputer, SCM peripheral circuit and control inputs interface infrared remote control module, is used for the output of each prescription ripple generation module is controlled respectively.
2. the parallel emission system of multichannel carrier light signal as claimed in claim 1, wherein said at least two group LED driver modules, can adjust LED unstable wave kinetic power according to the feedback signal that correspondence is organized light feedback module output, make corresponding group LED driver module with the carrier wave light signal of long power mode stable output power.
3. the parallel emission system of multichannel carrier light signal as claimed in claim 1, the high-speed switching circuit module that also comprises at least two groups and described square-wave signal module coupling, described each group high-speed switching circuit module realizes that the fast and stable of LED flicker switches between the square-wave signal module and LED driver module of correspondence group.
4. the parallel emission system of multichannel carrier light signal as claimed in claim 1, wherein said at least two prescription ripple transmitter modules, can set according to the application scenario tranmitting frequency of lightwave signal, and can switch at any time new frequency, in handoff procedure, phase place is controlled continuously.
5. the parallel emission system of multichannel carrier light signal as claimed in claim 1, wherein said at least two group light feedback circuit modules, can stablize the transmitting power of corresponding group LED, in time feed back to corresponding group LED drive circuit according to the transient change of correspondence group LED luminous power, and the power that brings of acting in conjunction fine setting instantaneous noise is unstable with it, makes corresponding group LED be operated in long power mode.
6. the parallel emission system of multichannel carrier light signal as claimed in claim 1, wherein said control terminal module can be controlled square wave generation module and produce the characteristic frequency square-wave signal, square-wave signal is controlled LED and is glimmered with characteristic frequency, and LED constant-current driven module and light feedback module are used for adjusting the LED drive current makes its transmitting power stable.
7. the parallel launching technique of a multichannel carrier light signal comprises following steps:
Realize overall intellectuality control by the control terminal module, drive the Direct Digital Frequency Synthesizers chip and produce square-wave signal, this square wave signal controlling LED is glimmering with fixed frequency under the monitoring of light feedback module and under the control of LED driver module.
8. the parallel launching technique of a multichannel carrier light signal comprises following steps:
Under the control of control terminal module, at least two prescription ripple generation modules produce one road square-wave signal separately;
Described each road square-wave signal is controlled the one group of LED driver module of correspondence at least two group LED driver modules, realizes the output of each paths of LEDs light signal;
The output of the LED light signal of the corresponding group of light feedback module monitoring of the correspondence group at least two group light feedback modules, and correspondence group LED driver module is carried out FEEDBACK CONTROL.
9. as the parallel launching technique of claim 7,8 described multichannel carrier light signals, wherein when the light feedback module of described corresponding group is monitored the output of the corresponding LED light signal of organizing, the feedback signal of the light feedback module of corresponding group is input in the LED driver module of corresponding group, to realize that corresponding group LED driver module is with the carrier wave light signal of long power mode stable output power.
10. as the parallel launching technique of claim 7,8 described multichannel carrier light signals, wherein said square-wave signal frequency and phase place are controlled continuously, and driving LED is glimmered with fixed frequency.
11. the parallel launching technique as claim 7,8 described multichannel carrier light signals, wherein said each road square-wave signal is controlled the LED of corresponding group, glimmer with constant power under the control of the light feedback module of correspondence group and LED driver module, described smooth feedback module adopts the opto-electronic conversion diode with the LED power erratic fluctuations feedback that receives, the LED driver module of described corresponding group makes it with the carrier wave light signal of long power mode stable output power according to the fluctuation of LED power erratic fluctuations Modulating Power.
12. the parallel launching technique as claim 7,8 described multichannel carrier light signals, wherein said method can be carried out multichannel carrier light emission expansion according to the different application occasion, described expanded function is based on the program updates of control module and the connectivity scenario of each independent path, path expansion number is not limit, but each independent path connected mode is constant.
13. as the parallel launching technique of claim 7,8 described multichannel carrier light signals, it is characterized in that described each prescription ripple generation module, comprise a slice DDS Direct Digital frequency synthesis chip and chip periphery circuit; Described each group LED driver module comprises specific wavelength LED Light-Emitting Diode, current regulator diode, high speed triode switch, peripheral coupling and connecting circuit; Described each group light feedback module comprises opto-electronic conversion diode, operational amplifier, and each connecting circuit; Described control terminal module comprises single-chip microcomputer, SCM peripheral circuit and control inputs interface infrared remote control module.
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