CN103166904B - A kind of parallel transmitting method of multichannel carrier light signal and system - Google Patents
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Abstract
The present invention discloses the parallel of a kind of multichannel carrier light signal and stablizes launching system and method, by the intelligentized control method of control terminal, drive Direct Digital Frequency Synthesizers chip generation square wave signal, this square wave signal frequency and Phase Continuation are controlled, export square wave signal control LED to glimmer with fixed frequency, in LED operation process, LED drive module and light feedback module acting in conjunction make it with the carrier light signal of long power mode stable output power, the LED power erratic fluctuations of reception is fed back and is suppressed fluctuation of power in conjunction with LED drive module by light feedback module employing opto-electronic conversion diode, and by arranging multiple paths of square signals producer parallel and LED module produces channelized frequencies and the controlled carrier light signal of phase place. the whole system intelligence of the present invention is controlled, integrated level height, low in energy consumption, and working stability is reliable, can multichannel expand, wide accommodation, is a kind of integration carrier light generation systems.
Description
Technical field
The present invention relates to the transmitting method of optical signal and system, particularly relate to parallel transmitting method and the system of multichannel carrier light signal.
Background technology
Along with the development of photoelectric technology, optical signal gets more and more as the occasion of carrier wave signal, such as, needs multichannel carrier light to launch in parallel spectrum detection technique simultaneously, enters material to be checked, and carry material relevant information to be checked and be sent to receiving end. The frequency of multipath light signal, phase place and degree of stability are had higher requirements by this kind of multipath light signal transmitting-receiving scheme. For another example, optical communication is the main mode of future communications, useful signal is sent as information carrier using light wave, carrier light carries most important effect as the carrier wave in optical signal modulation, no matter it is the useful signal of electrical signal form is converted to optical signal directly send, or being modulated on carrier light signal by useful signal and send, light emission module is all the core link of whole system. In wireless communications application, signal is propagated in atmosphere with form of light waves, is sent to receiving end, and the generation of light wave also plays keying action as mentioned above in communication process.
So extensively, as the signal source of above-mentioned application scenario, the quality of its performance directly determines the serviceability of application system in carrier light application, and stable carrier light is launched very important. In existing carrier light launching means, also there is no at present a kind of strong adaptability for various application occasions design, carrier light launching system that extendability is strong, existing carrier light launching system mainly relies on signal generator transmit square waves modulation signal, laser apparatus or semiconductor laser LD (LaserDiode is controlled with square wave signal, LD) launching carrier light signal, this system has following shortcoming:
(1) transmitting frequency is single: existing carrier light system generally designs transmitting frequency for stationary applications occasion, and carrier light signal frequency relies on signal generator and produces, and is only applicable to the system of stationary applications occasion design, and inconvenience loads on other Working environments.
(2) light path is single: light path number is required to be confined to self-demand by different carrier light application scenarios, and when needing the situation expanding light path, existing system is difficult to reply.
(3) frequency error factor problem: general carrier light launching system frequency is fixed, inconvenience regulates, it is discontinuous to there is phase place when switching frequency in minority frequency-adjustable system, switch speed is slower, there are the problems such as certain delay, it is not suitable for and needs quick switching frequency, and when switching, require the occasion of Phase Continuation.
(4) carrier light transmitted power is unstable: carrier light is extremely important as the stability of its transmitted power of light signal, existing system generally relies on the control circui output ratings such as constant-current driving, there is certain current drift in LED drive module, not producing instantaneous saltus step when the performance of luminescent device own can not ensure driving current stabilization in addition, overall performance has much room for improvement.
(5) portability is poor: existing carrier light level of integrated system is low, does not consider all module integrated, and volume own is relatively big, and portability is low.
(6) intelligence degree is low: can not accomplishing intellectuality during carrier light system works, regulate process is comparatively complicated, relies on manual regulation, it may also be useful to convenient not.
(7) power consumption height: signal generator itself needs 220V voltage, relatively big for electrical power consumed, and luminescent device many employings laser apparatus and LD, power consumption is higher than LED, inadequate environmental protection and energy saving.
In a word, existing carrier light launching system design effort pattern is single, switch speed is low, phase place is discontinuous, optional transmitting frequency is less, light path extendability portability poor, overall is low, power consumption height, not environmentally, though certain application scenario can be dealt with, but adaptability is not high, intelligence degree is low.
Summary of the invention
For the problems referred to above, urgently need to develop parallel transmitting method and the system of a kind of multichannel carrier light signal.
Thus, the present invention proposes following thinking and solves the problem, and the present invention relates to the parallel launching system of a kind of multichannel carrier light signal, comprises square wave generation module, LED drive module, light feedback module, control terminal module, wherein
At least two prescription ripple generation modules, wherein each prescription ripple generation module comprises direct digital synthesis technique (DirectDigitalSynthesizer, a DDS) chip and chip periphery circuit produces a road square wave signal;
At least two group LED drive module, wherein each group comprises a LED light emitting diode and relevant connection circuit, realizes the output of LED light signal with the square wave generation module of corresponding group coupling respectively;
At least two group light feedback modules, wherein each group comprises opto-electronic conversion diode, operational amplifier, and relevant connection circuit, and the optical signal of LED drive module is exported and realizes feedback control by the optical signal output of reception corresponding group LED drive module respectively;
Control terminal module, comprises micro-chip, SCM peripheral circuit, micro-chip control program and the infrared remote control module of control inputs interface, for the output of each prescription ripple generation module being controlled.
Preferably, at least two described group LED drive module, it is possible to LED erratic fluctuations power is adjusted by the feedback signal feeding back module output according to correspondence group light, make corresponding group LED drive module with the carrier light signal of long power mode stable output power.
Preferably, also comprising at least two group high-speed switching circuit modules, described each group of high-speed switching circuit module is between the square wave signal module and LED drive module of correspondence group, it is achieved the fast and stable switching of LED flicker.
In addition, the present invention also relates to a kind of parallel transmitting method of multichannel carrier light signal, comprises following step:
Realizing overall intelligentized control method by control terminal module, drive Direct Digital Frequency Synthesizers chip to produce square wave signal, this square wave signal control LED, glimmers with fixed frequency feed back the monitoring of module at light under and under the control of LED drive module.
In addition, the present invention also relates to a kind of parallel transmitting method of multichannel carrier light signal, comprises following step:
Under the control of control terminal module, at least two prescription ripple generation modules produce a road square wave signal separately;
Correspondence one group of LED drive module in the square wave signal control at least two group LED drive module of described each road, it is achieved the output of each paths of LEDs optical signal;
The output of the LED light signal of the light feedback module monitors correspondence group of the corresponding group at least two group light feedback modules, and correspondence group LED drive module is carried out feedback control.
Preferably, described square wave signal frequency and Phase Continuation are controlled, drive LED to glimmer with fixed frequency.
Preferably, described square wave signal control LED, glimmer with constant power under the control that light feeds back module and LED drive module, the LED power erratic fluctuations that light feedback module adopts opto-electronic conversion diode to receive is fed back, LED drive module fluctuates according to LED power erratic fluctuations Modulating Power so that it is with the carrier light signal of long power mode stable output power.
Preferably, described method can carry out multichannel carrier light according to different application occasion and launch expansion, the connection scheme of the program updates of described extended functionality based on control module and each independent path, path expansion number is not limit, but each independent path mode of connection is constant.
The present invention, owing to taking above technical scheme, has the following advantages:
1, electric impulse signal produces: DDS adopts digital technology, it has following advantage: (1) frequency inverted is fast: DDS is without any feedback link, the frequency inverted time changes time and circuit delay time by frequency control word state and determines, switching time very short (most I reach 400ns); (2) frequency resolving power height, frequency number is many: resolving power and the frequency number of DDS output frequency increase with the figure place exponentially of phase-accumulated device, and resolving power can reach micro-hertz, can meet fine frequency control overflow; (3) Phase Continuation: DDS, when changing frequency, only need to change frequency control word, and not change original phase accumulation value, and therefore when frequency changes, phase drift is little; (4) phase place noise is little: DDS phase place noise depends primarily on the phase place noise of reference source, if reference clock source phase place noise is little, the frequency phase noise that so DDS produces is also little; (5) control is easily, reliable and stable.
The above-mentioned advantage of DDS directly determines that the square wave signal of native system has frequency stabilization, frequency is many, phase place noise is little, Phase Continuation, the feature such as easy to control, and therefore carrier light of the present invention is widely used, and suitability is strong.
2, LED constant current drives: the present invention adopts constant current diode to drive LED, and constant current diode integrated level height, strong adaptability, stability is remarkable, it is achieved simple circuit, and electric current and voltage control only need to rely on the series-parallel connection of multiple constant current diode to realize.
3, LED light feedback: the unstable optical signal that the light feedback instantaneous noise of module acquires LED drive module produces, it is translated into electrical signal and feeds back to driving circuit, luminous power is finely tuned, making LED emission optical signal power constant, therefore system can be used for utilizing carrier light as measurement means and the occasion that carrier light power stability requirement is high.
4, high-speed switching circuit: high-speed switching circuit is connected square wave electrical signal generation module and LED drive module, overcomes the shortcomings such as the response delay that LED drive module may exist, makes final carrier light signal stable duty ratio, frequency height, can be applicable to high frequency occasion.
5, control terminal controls multiple light path: control terminal machine programmable operations DDS chip generation multichannel independence square wave signal, every road signal is mutually completely independent, can be used to control LED and realize different frequency carrier optical signal generation, and each road square wave signal can according to the switching of different application demand programming realization frequency, when using micro-chip as control module, infrared remote control input frequency and phase place can be added, 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, and a corresponding DDS chip of road carrier light, according to different application occasion, can expand light path as required. Only respective optical path need to being arranged, can produce required carrier light signal, and integrate multichannel signal by control terminal, by force, expansion is convenient easily to be realized extendability, is applicable to hyperchannel carrier light signal madulation and the transmitting of multichannel light signal.
Accompanying drawing explanation
For the structure of the present invention, feature and object thereof are described further, below in conjunction with accompanying drawing and preferred embodiment, the present invention is described in detail, wherein:
Fig. 1 is the overall functional block diagram that the multichannel carrier light of the present invention launches module parallel;
Fig. 2 is the connection functional block diagram of the high speed switch of the present invention, LED constant current and light feedback module;
Fig. 3 be the present invention square wave signal generator module and with the connection functional block diagram of control terminal;
The multichannel carrier light extended functionality that Fig. 4 is the present invention realizes functional block diagram.
Embodiment
For making the object, technical solutions and advantages of the present invention clearly understand, 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 drive module, light feedback module, control terminal module, be described in detail as follows:
1, carrier light undertakes and loads other useful optical signal tasks, in application, its performance requriements is very high. Therefore carrier light square wave frequency and dutycycle must be stablized and accurately, this requirement is not only embodied in transmitting end, and for any receiving end, the conversion of later stage signal and demodulation are all necessary by stable frequency and dutycycle. The square wave generation module of the present invention adopts DDS to produce square wave as electric impulse signal, DDS is the frequency synthesizer of a kind of total digitalization, and after given reference clock frequency, output signal frequency only depends on frequency control word, not disturbing by other factors, application scenario is extensive.
2, in LED drive module, LED is responsible for electric impulse signal being converted into optical signal to realize the transmission of optical signal, and LED is widely used in the fields such as backlight, Signal aspects, illumination, there is volume little, low in energy consumption, the life-span is long, is convenient to regulation and control and the feature such as pollution-free. LED is that electric current drives, and its output rating is directly decided by strength of current, and for ensureing that LED is luminous efficient, even, LED drives source to should be constant current output. There is circuit complexity in current LED drive circuit design majority, efficiency is not high and the feature such as circuit cost height. The LED drive circuit of inventive design adopts constant current diode, and constant current diode forward conducting, output constant current, oppositely ends, no-output. As long as on request in put in circuit, loop can realize constant current object.
3, all there is instantaneous noise in any circuit, drives module as the same for LED constant current. When carrier light is applied to the occasion that optical power stability requirement is higher, this point just determines the serviceability of system. In order to prevent instantaneous noise that the impact of electric current so that LED luminous power is unstable, the present invention adds light inlet feedback module, by instability optical signal feedback to LED drive module, is finely tuned by electric current, ensures the stable of LED luminous power.
4, considering that carrier light may be applied to high frequency occasion, LED drive module response speed may cause the drift of final optical signal frequency and square wave signal delay, and it's switching time pastes the factors such as long level. The present invention adds high-speed switching circuit module between square wave signal module and LED drive module, it is achieved the fast and stable switching of LED flicker, is applicable to high frequency carrier light and occurs, optical signal stable duty ratio, and between high-low power, switch speed is fast, postpones short.
5, in order to expand the application scenario of native system, the present invention utilizes the programmable features of DDS chip, adopt micro-chip and computer as upper computer to DDS chip write frequency and phase control words, realize square wave instant, Phase Continuation switching and multiple paths of square signals generation, it is applicable to need the occasion of multiple photo-signal channel, it is achieved multichannel carrier light exports.
As shown in Figure 2, the present invention adopts square wave signal control LED/light source to glimmer with fixed frequency, produces required carrier light. square wave signal is produced by DDS chip, the such as AD7008 of AnalogDevices company, AD9833, AD0952 etc., DDS connects external crystal-controlled oscillation source, to outside crystal oscillation fractional frequency, programming write DDS control bit OPBITEN makes it put 1, DDS can export the MSB of its DAC data, this signal is square wave form, by calculating, concrete frequency and phase place information then determine that DDS chip frequency control register is loaded particular value by required frequency respective frequencies control word, produce the square wave signal of fixed frequency, and utilize the phase control register of DDS chip, write particular phases control word, realize the demand for control to phase place. in whole square wave generation process, frequency control register and phase control register can reset at any time, to load different frequency control words and phase control words, as long as whole switching process external crystal-controlled oscillation is reliable and stable, the square wave signal occurred can accomplish Phase Continuation, frequency stabilization, frequency resolving power height.
Square wave signal control high-speed switching circuit, responds fast to control LED, stable flicker, and high-speed switching circuit adopts high speed switch triode, and base stage connects square wave signal, and emitter grounding, collector electrode connects power supply and respective load. When square wave lower level arrives, triode emitter-base bandgap grading and collector electrode disconnect, load added by power supply cannot ground connection, loop is obstructed, and load no current passes through; When square wave high level arrives, triode emitter-base bandgap grading and collector electrode conducting, load circuit conducting added by power supply, circuit there is electric current pass through, load is started working, and three grades of pipe fast response times, can be converted to load work and stopping state by square wave signal with delay little as far as possible at a high speed.
Above-mentioned high speed switching load access LED drive module, square wave signal can control work and the stopping of LED drive module, and to realize LED flicker, and when glimmering, luminous power is constant. LED drive module utilizes constant current diode and LED strip connection form, if electric current needed for LED can increase large-drive-current by multiple constant current diode in parallel greatly. Circuit side connector case is simple, and integrated level height, power consumption is little.
LED sends optical signal and also to be fed back module through light and feed back, LED sends optical signals PD photoelectric conversion tube collection, PD pipe converts the optical signal of collection to electrical signal, LED drive module is connect back through reaction circuit, to LED drive module current feedback, detailed process is as follows: in feedback module, MOS pipe and LED are in parallel, shunting constant current diode current, when the drift of LED emission light exceeds setting working current, this optical signal is converted to electric current signal and controls the shunting increase of MOS pipe by feedback loop by PD, such LED current returns to normal value, when the drift of LED emission light is lower than setting working current, this signal back MOS is managed by PD, feedback loop control MOS pipe shunting reduces, LED shunts increase and returns to working current, so just, achieve LED emission luminous power constant, optical signal is directly fed back to driving circuit, do not need to depend on the performance of constant current circuit, whole transmitting process stabilization is reliable.
As shown in Figure 3, control terminal of the present invention adopts PC to write serial communication program and be loaded on micro-chip, utilizing microcontroller serial port to connect DDS chip controls register port, to the required frequency of DDS chip write and phase control words, and enable DDS chip starts square wave signal.
As shown in Figure 4, owing to micro-chip has multichannel I/O port, SCLK and the SDATA end that microcontroller serial port RX and DX termination can enter DDS enters clock signal path and data signal path as the data write of DDS chip, other I/O port are connected to the enable control port of FYNC of DDS chip as Enable Pin, the write of controlled frequency and phase data and stopping. Consider the expansion that multichannel occurs, RX and the DX ports share data that multiple DDS chip shares a micro-chip send path and data transmission clock path, and each DDS accesses a road micro-chip I/O interface respectively, occur enable by the time variable control I/O interface level corresponding DDS chip square wave of height control, it is achieved the multichannel DDS chip controls of time-division form. Only need a slice micro-chip just can control multiple DDS chip and different frequencies occurs, coding and decoding circuit also can be utilized when I/O port is not enough to be encoded whole DDS Enable Pin address, single-chip I/O mouth is by the enable corresponding DDS of programming addressing, so just, can according to different occasion spread signal path, it is achieved multichannel extended functionality.
Above-described specific embodiment; the object of the present invention, technical scheme and useful effect have been further described; it it should be understood that; the foregoing is only specific embodiments of the invention; it is not limited to the present invention; within the spirit and principles in the present invention all, any amendment of making, equivalent replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (12)
1. a parallel launching system for multichannel carrier light signal, comprises square wave generation module, LED drive module, light feedback module, control terminal module, wherein
At least two prescription ripple generation modules, wherein each prescription ripple generation module comprises a direct digital synthesis technique chip and chip periphery circuit produces a road square wave signal;
At least two group LED drive module, wherein each group of LED drive module comprises a LED light emitting diode and relevant connection circuit, realizes the output of LED light signal with the square wave generation module of corresponding group coupling respectively;
At least two group light feedback modules, wherein each group of light feedback module comprises opto-electronic conversion diode, operational amplifier, and relevant connection circuit, the optical signal output of LED drive module is realized feedback control by the optical signal output receiving corresponding group LED drive module respectively;
Control terminal module, comprises micro-chip, SCM peripheral circuit and the infrared remote control module of control inputs interface, for the output of each prescription ripple generation module being controlled respectively.
2. the parallel launching system of multichannel carrier light signal as claimed in claim 1, at least two wherein said group LED drive module, LED erratic fluctuations power is adjusted by the feedback signal for exporting according to correspondence group light feedback module, makes corresponding group LED drive module with the carrier light signal of long power mode stable output power.
3. the parallel launching system of multichannel carrier light signal as claimed in claim 1, also comprise the high-speed switching circuit module that at least two groups are mated with described square wave generation module, described each group of high-speed switching circuit module is between the square wave generation module and LED drive module of correspondence group, it is achieved the fast and stable switching of LED flicker.
4. the parallel launching system of multichannel carrier light signal as claimed in claim 1, at least two wherein said prescription ripple generation modules, for setting the transmitting frequency of lightwave signal according to application scenario, and can switching new frequency at any time, in handoff procedure, Phase Continuation is controlled.
5. the parallel launching system of multichannel carrier light signal as claimed in claim 1, at least two wherein said group light feedback modules, for the transmitted power of stable correspondence group LED, temporal variation according to correspondence group LED luminous power feeds back to corresponding group LED drive circuit in time, and the power instability that instantaneous noise brings is finely tuned in acting in conjunction with it, make corresponding group LED operation at long power mode.
6. the parallel launching system of multichannel carrier light signal as claimed in claim 1, for controlling, square wave generation module produces specific frequency square wave signal to wherein said control terminal module, square wave signal control LED then is used for adjusting LED drive current with specific frequency scintillation, LED drive module and light feedback module makes its transmitted power stablize.
7. a parallel transmitting method for multichannel carrier light signal, comprises following step:
Under the control of control terminal module, at least two prescription ripple generation modules produce a road square wave signal separately;
Correspondence one group of LED drive module in the square wave signal control at least two group LED drive module of described each road, it is achieved the output of each paths of LEDs optical signal;
The output of the LED light signal of the light feedback module monitors correspondence group of the corresponding group at least two group light feedback modules, and correspondence group LED drive module is carried out feedback control.
8. the parallel transmitting method of multichannel carrier light signal as claimed in claim 7, wherein when the output of the light corresponding LED light signal organized of feedback module monitors of described correspondence group, the feedback signal of the light feedback module of corresponding group is input in the LED drive module of corresponding group, to realize corresponding group LED drive module with the carrier light signal of long power mode stable output power.
9. the parallel transmitting method of multichannel carrier light signal as claimed in claim 7, frequency and the Phase Continuation of wherein said square wave signal are controlled, drive LED to glimmer with fixed frequency.
10. the parallel transmitting method of multichannel carrier light signal as claimed in claim 7, the LED of the wherein said corresponding group of each road square wave signal control, glimmer with constant power under the light feedback module of correspondence group and the control of LED drive module, described light feedback module adopts opto-electronic conversion diode the LED power erratic fluctuations of reception to be fed back, the LED drive module of described correspondence group fluctuates according to LED power erratic fluctuations Modulating Power so that it is with the carrier light signal of long power mode stable output power.
The parallel transmitting method of 11. multichannel carrier light signals as claimed in claim 7, wherein said method can carry out multichannel carrier light according to different application occasion and launch expansion, the connection scheme of the program updates of extended functionality based on control terminal module and each independent path, path expansion number is not limit, but each independent path mode of connection is constant.
The parallel transmitting method of 12. multichannel carrier light signals as claimed in claim 7, it is characterised in that described each prescription ripple generation module, comprises a slice DDS direct digital synthesis technique chip and chip periphery circuit; Described each group of LED drive module, comprises specific wavelength LED light emitting diode, constant current diode, high speed triode switch, peripheral coupling and junction circuit; Described each group of light feedback module, comprises opto-electronic conversion diode, operational amplifier, and each junction circuit; Described control terminal module, comprises micro-chip, SCM peripheral circuit and the infrared remote control module of control inputs interface.
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| 基于单片机的智能信号发生器设计;张文军;《机电工程技术》;20100930;全文 * |
| 遥测系统信号校准中的DDS技术应用研究;任光;《硅谷》;20120115;全文 * |
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