CN104883800A - GHz high-speed LED optical communication driver - Google Patents
GHz high-speed LED optical communication driver Download PDFInfo
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- CN104883800A CN104883800A CN201510330960.9A CN201510330960A CN104883800A CN 104883800 A CN104883800 A CN 104883800A CN 201510330960 A CN201510330960 A CN 201510330960A CN 104883800 A CN104883800 A CN 104883800A
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Abstract
The invention discloses a GHz high-speed LED optical communication driver. A power supply module is used for outputting a needed constant voltage for supply, and limiting an output current. An LED working module consists of a resonant cavity, an LED, and a K101. A control module comprises a PWM generation device, a positive Buffer and a negative Buffer, and is used for the on/off control of the switch K101. A constant current module consists of a resistor, a capacitor, and an operational amplifier. The cathode of the LED is sequentially connected with the switch K101 and the resistor in a series manner, and then is grounded. The resonant cavity is in parallel connection with the LED. One end of a current-limiting constant voltage unit is connected with the anode of the LED, and the other end of the current-limiting constant voltage unit is grounded. An output end of the PWM generation device is connected with the input end of the positive Buffer and the input end of the negative Buffer at the same time. The output ends of the positive Buffer and the negative Buffer output control signals so as to control the switch K101. The driver can achieve the high-speed on/off of the switch K101, thereby achieving the superspeed light modulation of the LED.
Description
Technical field
The present invention relates to a kind of LED light communication drivers, particularly relate to a kind of GHz high speed LED high speed optical communication driver.
Background technology
The LED light communication technology is a kind of brand-new communication technology progressively grown up in recent years, and a lot of relevant technical research is also in the starting stage, especially almost blank especially in the technology of high speed LED component, high-speed switching circuit.Optical communication to realize superfast optical switch speed, and be not the speed-sensitive switch in circuit common, this point it is emphasized that the switching rate of light, and switching rate that is non-electronic or hole.Optical communication is in order to the deficiency of the wireless communications application such as supplementary WIFI, and substituting WIFI in some field becomes a kind of brand-new communication mode.The LED light communication technology is a kind of brand-new communication technology progressively grown up in recent years, and a lot of relevant technical research is also in the starting stage, especially almost blank especially in the technology of high speed LED component, high-speed switching circuit.A LED switch of connecting carries out the field that simple modulation is brand-new developing, and LED light communication needs the driving modulation circuit support of a high speed, there is no the modulation solution of a system at present in superfast application.
Summary of the invention
Technical problem to be solved by this invention is for above-mentioned the deficiencies in the prior art, provides a kind of high speed LED light communications driver, the present invention relates to the superfast LED light modulation of GHz that a kind of LED high speed optical communication driver can realize system.
For realizing above-mentioned technology, the technical scheme that the present invention takes is: a kind of GHz high speed LED light communications driver, comprises power supply unit, LED operational module, switch control module and constant flow module; It is characterized in that: supply module is made up of current limliting constant voltage power supply unit, power for the constant voltage needed for applicable output and output current is limited; LED operational module is made up of resonant cavity, LED and K switch 101; Control module comprises PWM generating means, positive electricity Buffer, negative electricity Buffer, for carrying out switch control rule to switch K101; Constant flow module is made up of resistance, electric capacity and amplifier; The negative electrode of LED connect successively with K switch 101, resistance after ground connection; Resonant cavity is in parallel with LED; Current limliting constant voltage unit one end is connected with LED anode, other end ground connection; The output of PWM generating means is connected with the input of positive electricity Buffer and negative electricity Buffer input simultaneously; The output of positive electricity Buffer and negative electricity Buffer output export control signal with control switch K101; The in-phase input end ground connection of amplifier, inverting input is connected with the ungrounded end of resistance; Electric capacity C1 is connected with between the inverting input of amplifier and the output of amplifier; The output of amplifier is also connected with pressure limiting constant current unit.
As further improved technical scheme of the present invention, described pressure limiting constant current unit comprises filter, rectifier bridge and the circuit for power conversion of connecting successively; The filter other end is AC input, inputs for civil power; Civil power enters circuit for power conversion after filter filtering, rectifier bridge rectification; Described circuit for power conversion is powered for realizing DC-DC to produce a constant voltage be applicable to needed for output and limits output current, and the voltage of output is Va, Vb and Vg tri-groups.
As further improved technical scheme of the present invention, also comprise the PFC be connected between rectifier bridge and circuit for power conversion; Described PFC is used for Active PFC and produces a high voltage direct current exporting, to reduce the humorous wave interference to civil power.
As further improved technical scheme of the present invention, described K switch 101 is High Electron Mobility Transistor.
As further improved technical scheme of the present invention, when PWM generating means produces a positive voltage, positive electricity Buffer and negative electricity Buffer driving switch K101 is open-minded, LED is powered by current limliting constant voltage power supply unit and constant flow module forward and produces the electric current of an overshoot, make LED shinny fast, now resonant cavity storage power simultaneously; When PWM generating means produces a specific negative voltage, positive electricity Buffer and negative electricity Buffer driving switch K101 closes, and resonant cavity produces a reverse spike voltage by resonance and oppositely powers to LED, to accelerate the shutoff of LED; Described resonant cavity, after controlling resonant parameter, can control the time of oppositely power supply, to realize sequencing control, resonant cavity and LED turn-off time can be compared.
As further improved technical scheme of the present invention, described control device comprises frequency conversion engine, reference clock signal source, reference power supply, voltage controlled oscillator, compensating network, program control and buffer; Also comprise electric capacity C2; Reference clock signal source, reference power supply, voltage controlled oscillator, compensating network are connected with frequency conversion engine respectively with programme controlled output; The output of reference power supply is also connected with program control, and programme controlled output is also connected with buffer simultaneously; For control switch K101 after the output series capacitance C2 of buffer.
PFC Chinese is: Active PFC, in the present invention, PFC is as power factor correction circuit, in order to increase the angle of flow of rectifier, revises the waveform of input current and makes it to follow the sine wave that voltage waveform becomes ideal, thus reduce input harmonics content, improve the mutual interference of electrical network.In addition, the decline due to harmonic content also makes the disturbance composition of rear stage system reduce, and improves the performance of system.PWM is the abbreviation of English " PulseWidth Modulation ", is called for short pulse-width modulation, is a kind of method of high frequency chopping, is realized the function accurately controlled output parameter by the size of duty ratio in regulating cycle.
Operation principle of the present invention: a: current limliting constant voltage power supply unit is in order to provide supply module, wherein AC input is civil power input, filter carries out filtering, rectifier bridge carries out rectification, PFC carries out Active PFC and produces a high voltage direct current exporting, PFC module is only the humorous wave interference reduced civil power, circuit for power conversion be realize DC-DC with produce one be applicable to exporting needed for constant voltage power and output current limited, the voltage of output is Va, Vb and Vg tri-groups and more other group output voltages, b: resonant cavity, LED and K switch 101 forms LED operational module, c:PWM generating means and positive electricity Buffer, negative electricity Buffer forms the control module to the switch control rule of switch K101, this control module the most important thing is just realizing, the power supply of negative voltage, what adopt is " relatively " level conversion method, as Fig. 3, Vg gives the ground of control chip as control chip simultaneously, and Vg<0, ground connection when in other words the ground of control chip will work lower than LED, but power supply Vvco and Vref needed for chip must be positive relative to Vg, then Va=Vvco+Vg>0, Vb=Vref+Vg>0, ground connection when being worked relative to LED by the output regulating the value of Vg then can realize control chip is just, negative voltage driving, and realize ultrahigh speed control (because be immediately produced by control chip simultaneously, there is no the demand of change-over time, just power consumption slightly increases), d: resistance, electric capacity and amplifier form constant flow module.
When control chip produces a high level (level when this high level works relative to LED is just), open-minded by positive electricity Buffer and negative electricity Buffer driving switch K101, the forward voltage that LED is produced by conversion by civil power carries out powering and produces the electric current of an overshoot, LED is shinny fast, now resonant cavity storage power simultaneously.When control chip produces a specific low level (level when this low level works relative to LED is negative), closed by positive electricity Buffer and negative electricity Buffer driving switch K101, resonant cavity produces a reverse spike voltage by resonance and oppositely powers to LED, and the electricity accelerating LED turns off.In addition, the time that strictly can control oppositely power supply by accurately controlling resonant parameter is also sequential control methods, itself and LED electrical turn-off time can be compared, thus the charge carrier radiation recombination efficiency avoiding band curvature to bring declines and light shutoff speed is accelerated.
So-called overshoot is open-minded, refers to that the ascent stage that LED is starting is in momentary excess current operating state, just enters the constant current operation state of stable state subsequently.So-called electricity turns off and light shutoff refers to that in fact LED has two turn off process, and one is broken by the TURP of outer loading, and be called that electricity turns off, now LED can't extinguish at once, but is just extinguishing after a bit of time; The extinguishing of light is referred to as light and turns off, and so, corresponding with it also has electric-opening and light are opened, in other words, and the electricity of LED and only have certain sequential relationship.
The present invention can realize the GHz high speed open and close of K switch 101, thus realizes the high speed light modulation to LED.Simply connecting from tradition, to carry out modulation to LED different for a regular tap pipe, present invention employs the resonance method, method opened in overshoot, High Electron Mobility Transistor that inverse injection method, band curvature orthosis, the sequencing control of innovation and relative level transformation approach, positive/negative-pressure drive method to go driving one novel, such as HEMT device, it works in Linear Amplifer state, and provides the GHz ultrahigh speed of a system to drive solution.
Accompanying drawing explanation
Fig. 1 is principle general diagram of the present invention.
Fig. 2 of the present inventionly realizes theory diagram.
Fig. 3 is that LED drive circuit of the present invention resolves schematic diagram.
Below in conjunction with accompanying drawing, the specific embodiment of the present invention is described further.
Embodiment
Embodiment 1
See Fig. 1, this GHz high speed LED light communications driver, comprise power supply unit, LED operational module, switch control module and constant flow module; It is characterized in that: supply module is made up of current limliting constant voltage power supply unit, power for the constant voltage needed for applicable output and output current is limited; LED operational module is made up of resonant cavity, LED and K switch 101; Control module comprises PWM generating means, positive electricity Buffer, negative electricity Buffer, for carrying out switch control rule to switch K101; Constant flow module is made up of resistance, electric capacity and amplifier; The negative electrode of LED connect successively with K switch 101, resistance after ground connection; Resonant cavity is in parallel with LED; Current limliting constant voltage unit one end is connected with LED anode, other end ground connection; The output of PWM generating means is connected with the input of positive electricity Buffer and negative electricity Buffer input simultaneously; The output of positive electricity Buffer and negative electricity Buffer output export control signal with control switch K101; The in-phase input end ground connection of amplifier, inverting input is connected with the ungrounded end of resistance; Electric capacity C1 is connected with between the inverting input of amplifier and the output of amplifier; The output of amplifier is also connected with pressure limiting constant current unit.
Preferably, in the present embodiment 1, see Fig. 2, described pressure limiting constant current unit comprises filter, rectifier bridge and the circuit for power conversion of connecting successively; The filter other end is AC input, inputs for civil power; Civil power enters circuit for power conversion after filter filtering, rectifier bridge rectification; Described circuit for power conversion is powered for realizing DC-DC to produce a constant voltage be applicable to needed for output and limits output current, and the voltage of output is Va, Vb and Vg tri-groups.Also comprise the PFC be connected between rectifier bridge and circuit for power conversion; Described PFC is used for Active PFC and produces a high voltage direct current exporting, to reduce the humorous wave interference to civil power.K switch 101 is High Electron Mobility Transistor.When PWM generating means produces a positive voltage, positive electricity Buffer and negative electricity Buffer driving switch K101 is open-minded, LED is powered by current limliting constant voltage power supply unit and constant flow module forward and produces the electric current of an overshoot, makes LED shinny fast, now resonant cavity storage power simultaneously; When PWM generating means produces a specific negative voltage, positive electricity Buffer and negative electricity Buffer driving switch K101 closes, and resonant cavity produces a reverse spike voltage by resonance and oppositely powers to LED, to accelerate the shutoff of LED; Described resonant cavity, after controlling resonant parameter, can control the time of oppositely power supply, to realize sequencing control, resonant cavity and LED turn-off time can be compared.Described control device comprises frequency conversion engine, reference clock signal source, reference power supply, voltage controlled oscillator, compensating network, program control and buffer; Also comprise electric capacity C2; Reference clock signal source, reference power supply, voltage controlled oscillator, compensating network are connected with frequency conversion engine respectively with programme controlled output; The output of reference power supply is also connected with program control, and programme controlled output is also connected with buffer simultaneously; For control switch K101 after the output series capacitance C2 of buffer.
The course of work of this GHz high speed LED light communications driver in fact simply, open and close two processes exactly: when PWM generating means produces a positive voltage, drive High Electron Mobility Transistor K101 open-minded by positive electricity Buffer, LED is powered by current limliting constant voltage supply module and constant flow module forward and produces the electric current of an overshoot, LED is shinny fast, now resonant cavity storage power simultaneously.When PWM generating means produces a specific negative voltage, drive High Electron Mobility Transistor K101 to close by negative electricity Buffer, resonant cavity produces a reverse spike voltage by resonance and oppositely powers to LED, and the electricity accelerating LED turns off.In addition, the time that strictly can control oppositely power supply by accurately controlling resonant parameter is also sequential control methods, itself and LED electrical turn-off time can be compared, thus the charge carrier radiation recombination efficiency avoiding band curvature to bring declines and light shutoff speed is accelerated.
Claims (6)
1. a GHz high speed LED light communications driver, comprises power supply unit, LED operational module, switch control module and constant flow module; It is characterized in that: supply module is made up of current limliting constant voltage power supply unit, power for the constant voltage needed for applicable output and output current is limited; LED operational module is made up of resonant cavity, LED and K switch 101; Control module comprises PWM generating means, positive electricity Buffer, negative electricity Buffer, for carrying out switch control rule to switch K101; Constant flow module is made up of resistance, electric capacity and amplifier; The negative electrode of LED connect successively with K switch 101, resistance after ground connection; Resonant cavity is in parallel with LED; Current limliting constant voltage unit one end is connected with LED anode, other end ground connection; The output of PWM generating means is connected with the input of positive electricity Buffer and negative electricity Buffer input simultaneously; The output of positive electricity Buffer and negative electricity Buffer output export control signal with control switch K101; The in-phase input end ground connection of amplifier, inverting input is connected with the ungrounded end of resistance; Electric capacity C1 is connected with between the inverting input of amplifier and the output of amplifier; The output of amplifier is also connected with pressure limiting constant current unit.
2. GHz high speed LED light communications driver according to claim 1, is characterized in that: described pressure limiting constant current unit comprises filter, rectifier bridge and the circuit for power conversion of connecting successively; The filter other end is AC input, inputs for civil power; Civil power enters circuit for power conversion after filter filtering, rectifier bridge rectification; Described circuit for power conversion is powered for realizing DC-DC to produce a constant voltage be applicable to needed for output and limits output current, and the voltage of output is Va, Vb and Vg tri-groups.
3. GHz high speed LED light communications driver according to claim 2, is characterized in that: also comprise the PFC be connected between rectifier bridge and circuit for power conversion; Described PFC is used for Active PFC and produces a high voltage direct current exporting, to reduce the humorous wave interference to civil power.
4. GHz high speed LED light communications driver according to claim 1, is characterized in that: described K switch 101 is High Electron Mobility Transistor.
5. the GHz high speed LED light communications driver according to claim 1 or 2 or 3 or 4, it is characterized in that: when PWM generating means produces a positive voltage, positive electricity Buffer and negative electricity Buffer driving switch K101 is open-minded, LED is powered by current limliting constant voltage power supply unit and constant flow module forward and produces the electric current of an overshoot, make LED shinny fast, now resonant cavity storage power simultaneously; When PWM generating means produces a specific negative voltage, positive electricity Buffer and negative electricity Buffer driving switch K101 closes, and resonant cavity produces a reverse spike voltage by resonance and oppositely powers to LED, to accelerate the shutoff of LED; Described resonant cavity, after controlling resonant parameter, can control the time of oppositely power supply, to realize sequencing control, resonant cavity and LED turn-off time can be compared.
6. the GHz high speed LED light communications driver according to claim 1 or 2 or 3 or 4, is characterized in that: described control device comprises frequency conversion engine, reference clock signal source, reference power supply, voltage controlled oscillator, compensating network, program control and buffer; Also comprise electric capacity C2; Reference clock signal source, reference power supply, voltage controlled oscillator, compensating network are connected with frequency conversion engine respectively with programme controlled output; The output of reference power supply is also connected with program control, and programme controlled output is also connected with buffer simultaneously; For control switch K101 after the output series capacitance C2 of buffer.
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| WO2013177757A1 (en) * | 2012-05-30 | 2013-12-05 | Zou Gaodi | Led light adjustment driver and led light source system |
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2015
- 2015-06-15 CN CN201510330960.9A patent/CN104883800B/en active Active
Patent Citations (6)
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|---|---|---|---|---|
| US20020139998A1 (en) * | 2000-12-22 | 2002-10-03 | Thales | Voltage offset diode |
| US20060291512A1 (en) * | 2005-06-24 | 2006-12-28 | Borschowa Lawrence A | Apparatus and method for driving laser diodes |
| CN101132115A (en) * | 2007-08-30 | 2008-02-27 | 吉林大学 | High power laser diode driver |
| CN101540476A (en) * | 2009-04-07 | 2009-09-23 | 吉林大学 | Constant current driver of digital semiconductor laser |
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| WO2013177757A1 (en) * | 2012-05-30 | 2013-12-05 | Zou Gaodi | Led light adjustment driver and led light source system |
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| CN104883800B (en) | 2017-04-12 |
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