CN104349526B - White light LEDs communication drive circuit and white light LEDs communication drivers method - Google Patents
White light LEDs communication drive circuit and white light LEDs communication drivers method Download PDFInfo
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- CN104349526B CN104349526B CN201310311480.9A CN201310311480A CN104349526B CN 104349526 B CN104349526 B CN 104349526B CN 201310311480 A CN201310311480 A CN 201310311480A CN 104349526 B CN104349526 B CN 104349526B
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Abstract
The present invention provides a kind of white light LEDs communication drive circuit and white light LEDs communication drivers method, and circuit includes: self adaptation DC/DC translation circuit, voltage clamping circuit and current control circuit；The input of described self adaptation DC/DC translation circuit is for being connected with power supply；The outfan of described self adaptation DC/DC translation circuit is connected with the first input end of described voltage clamping circuit；First outfan of described voltage clamping circuit is for being connected with the input of LED group；Second outfan feedback link of described voltage clamping circuit is to described self adaptation DC/DC translation circuit；Supply line between first outfan and described LED group of described voltage clamping circuit connects described current control circuit.Have that high efficiency, energy consumption be low, wide output voltage, the advantage that mounts not determined number LED.
Description
Technical field
The invention belongs to technical field of circuit design, be specifically related to a kind of white light LEDs communication drive circuit and white
Light LED communication driving method.
Background technology
White light LEDs communication technology refers to: utilize the luminescence response characteristic of LED component high speed point off, at transmitting terminal,
Transmission information is adjusted by the optical carrier that the most imperceptible high speed making LED send is modulated
System and transmission；At receiving terminal, utilize the electrooptical devices such as photodiode to receive optical carrier, and obtain
Information must be transmitted.
As can be seen here, in the white light communications field, the transmission of its signal relies on white light to propagate the most in atmosphere,
There is no other medium, therefore, luminous power be there are certain requirements, especially when field telecommunication, to light
Power requirement is higher.Owing to the luminescent core parts of white light communication system are that LED, LED drive electricity by LED
Road drives, and in prior art, LED drive circuit has the problem that operating current is less and power consumption is big, causes
Single led luminosity is difficult to meet the requirement of light source in white light communication system；Further, for meeting light
Source demand, needs to use multiple LED, accordingly, needs to configure multiple LED drive circuit, on the one hand, increase
Add optical system complexity；On the other hand, introduce the interference between each light source, thus reduce communication
Quality.Additionally, existing LED output electric current immobilizes, the problem with actually used inconvenience.
Summary of the invention
The defect existed for prior art, the present invention provides a kind of white light LEDs communication drive circuit and white light
LED communication driving method, has that high efficiency, energy consumption be low, wide output voltage, mounts not determined number LED
Advantage.
The technical solution used in the present invention is as follows:
The present invention provides a kind of white light LEDs communication drive circuit, including: self adaptation DC/DC translation circuit,
Voltage clamping circuit and current control circuit；The input of described self adaptation DC/DC translation circuit is for power supply even
Connect；The outfan of described self adaptation DC/DC translation circuit is connected with the first input end of described voltage clamping circuit；
First outfan of described voltage clamping circuit is for being connected with the input of LED group；The of described voltage clamping circuit
Two outfan feedback links are to described self adaptation DC/DC translation circuit；The first output at described voltage clamping circuit
Hold and described current control circuit of connecting in the supply line between described LED group.
Preferably, described voltage clamping circuit include electric current adjust metal-oxide-semiconductor, sample circuit, signal integration circuit and
Amplifying circuit；Described electric current adjusts the source electrode of metal-oxide-semiconductor and the output of described self adaptation DC/DC translation circuit
End connects；Described electric current adjusts the drain electrode of metal-oxide-semiconductor and is connected with the input of described LED group；Described adopt
The input of sample circuit adjusts the source electrode of metal-oxide-semiconductor with described electric current respectively and described electric current adjusts metal-oxide-semiconductor
Drain electrode connects, and the outfan of described sample circuit is connected with the input of described signal integration circuit；Described letter
Number outfan of integrating circuit is connected with the input of described amplifying circuit；The outfan of described amplifying circuit is anti-
Feedback is connected to the input of described self adaptation DC/DC translation circuit.
Preferably, described current control circuit includes: controller, D/A converter, current sampling circuit,
Signal amplification circuit and driving matrix current adjustment circuit；Described current sampling circuit is arranged on described electric current and adjusts
In supply line between drain electrode and the described LED group of metal-oxide-semiconductor, the outfan of described current sampling circuit
Being connected with the input of described signal amplification circuit, the outfan of described signal amplification circuit drives electricity with described
Stream adjusts the first input end of circuit and connects, and the outfan of described controller is connected by described D/A converter
To the second input of described driving matrix current adjustment circuit, the outfan of described driving matrix current adjustment circuit and institute
State electric current and adjust the grid connection of metal-oxide-semiconductor.
Preferably, described controller is single-chip microcomputer.
Preferably, described power supply is Switching Power Supply.
The present invention also provides for a kind of white light LEDs communication drivers side applying above-mentioned white light LEDs communication drive circuit
Method, comprises the following steps:
S1, is installed to the confession to described LED group of the described power supply by described white light LEDs communication drive circuit
In electric line；
S2a, when needs transmission data, modulates data in LED group, finally with the shape of optical signal
These data are sent by formula；
During these data send, described sample circuit gathers described electric current and adjusts working as of metal-oxide-semiconductor two ends
Front magnitude of voltage U1, after described current voltage value U1 integration amplification, produces pincers pressure feedback voltage, then
Described pincers pressure feedback voltage is transferred to the comparison input of described self adaptation DC/DC translation circuit；Described from
Adaptation DC/DC translation circuit, by described pincers pressure feedback voltage is compared and judged, produces and clamps voltage-controlled system
Instruction, the magnitude of voltage that described electric current adjusts metal-oxide-semiconductor two ends clamps within maximum voltage value；It addition, it is described
Self adaptation DC/DC translation circuit, according to described pincers pressure feedback voltage and current loading condition, adjusts certainly automatically
The output voltage U2 of body, makes U2=U1+U3；Wherein, U3 is the terminal voltage value of present load.
Preferably, after S1, also include:
S2b, described current sampling circuit gathers described electric current and adjusts the output current value of metal-oxide-semiconductor drain side,
After described output current value is amplified, obtain current signal I1, then described current signal I1 is transferred to institute
State the first input end driving matrix current adjustment circuit；
Described controller produces digital quantity reference value, described digital quantity reference value is changed by D/A converter
For analog quantity reference value, then described analog quantity reference value is transferred to the of described driving matrix current adjustment circuit
Two inputs；
Described driving matrix current adjustment circuit compares the described current signal I1 and described analog quantity benchmark received
Value, produces driving instruction, drives described electric current to adjust the grid of metal-oxide-semiconductor by described driving instruction, changes
Described electric current adjusts the constant current output current value of metal-oxide-semiconductor drain side.
Preferably, in S2a, described in modulate data on LED group particularly as follows:
When single-chip microcomputer receives, by serial ports, the data needing to send, by I/O port by described data with 0,1
Form control electric current adjusts the break-make of metal-oxide-semiconductor grid, thus these data is modulated in LED group.
Beneficial effects of the present invention is as follows:
The white light LEDs communication drive circuit of present invention offer and white light LEDs communication drivers method, have following
Advantage: can drive big electric current, meets the demand of LED power, also has high efficiency, energy consumption low, wide
Output voltage, the advantage mounting not determined number LED；Also there is simple in construction, easy to control and modulation rate
High advantage, can merge with visible light communication system well.
Accompanying drawing explanation
The circuit theory diagrams of the white light LEDs communication drive circuit that Fig. 1 provides for the present invention；
Voltage clamping circuit that Fig. 2 provides for the present invention and the circuit theory diagrams of current control circuit；
The circuit diagram of the self adaptation DC/DC translation circuit that Fig. 3 provides for the present invention；
Voltage clamping circuit that Fig. 4 provides for the present invention and the circuit diagram of current control circuit；
The circuit theory diagrams of the single-chip microcomputer that Fig. 5 provides for the present invention；
The circuit diagram of the single-chip microcomputer that Fig. 6 provides for the present invention.
Detailed description of the invention
Below in conjunction with accompanying drawing, the present invention is described in detail:
As it is shown in figure 1, the present invention provides a kind of white light LEDs communication drive circuit, including: self adaptation DC/DC
Translation circuit, voltage clamping circuit and current control circuit；The input of described self adaptation DC/DC translation circuit is used
In being connected with power supply；The outfan of described self adaptation DC/DC translation circuit is defeated with the first of described voltage clamping circuit
Enter end to connect；First outfan of described voltage clamping circuit is for being connected with the input of LED group；Described pincers
Second outfan feedback link of volt circuit is to described self adaptation DC/DC translation circuit；At described voltage clamping circuit
The first outfan and described LED group between supply line on connect described current control circuit.Such as figure
Shown in 3, for the circuit diagram of self adaptation DC/DC translation circuit.
As shown in Figure 2, Figure 4 shows, voltage clamping circuit includes that electric current adjusts metal-oxide-semiconductor, sample circuit, signal integration
Circuit and amplifying circuit；Described electric current adjusts the source electrode of metal-oxide-semiconductor and described self adaptation DC/DC translation circuit
Outfan connect；Described electric current adjusts the drain electrode of metal-oxide-semiconductor and is connected with the input of described LED group；
The input of described sample circuit adjusts source electrode and the adjustment of described electric current of metal-oxide-semiconductor respectively with described electric current
The drain electrode of metal-oxide-semiconductor connects, and the outfan of described sample circuit is connected with the input of described signal integration circuit；
The outfan of described signal integration circuit is connected with the input of described amplifying circuit；Described amplifying circuit defeated
Go out to hold feedback link to arrive the input of described self adaptation DC/DC translation circuit.
Current control circuit includes: controller, D/A converter, current sampling circuit, signal amplification circuit
With driving matrix current adjustment circuit；Described current sampling circuit be arranged on described electric current adjust metal-oxide-semiconductor drain electrode with
In supply line between described LED group, the outfan of described current sampling circuit amplifies with described signal
The input of circuit connects, the of the outfan of described signal amplification circuit and described driving matrix current adjustment circuit
One input connects, and the outfan of described controller is connected to described driving electric current by described D/A converter
Adjusting the second input of circuit, the outfan of described driving matrix current adjustment circuit adjusts MOS with described electric current
The grid of pipe connects.Wherein, controller is preferably single-chip microcomputer, and as seen in figs. 5-6, the circuit for single-chip microcomputer is former
Reason figure and circuit diagram.Power supply is preferably Switching Power Supply, by using Switching Power Supply, can effectively reduce driving
The volume of circuit, alleviates the cooling requirements of drive circuit, in application process, also simplify system structure.
For above-mentioned white light LEDs communication drive circuit, the white light LEDs communication drivers method carried out, including with
Lower step:
S1, is installed to the confession to described LED group of the described power supply by described white light LEDs communication drive circuit
In electric line；
S2a, when needs transmission data, modulates data in LED group, finally with the shape of optical signal
These data are sent by formula.Concrete, data modulation can be that external microcontroller drives or internal Micro Controller Unit (MCU) driving.
Concrete process is: when single-chip microcomputer receives, by serial ports, the data needing to send, by I/O port by described
Data adjust the break-make of metal-oxide-semiconductor grid with 0,1 form control electric current, thus these data are modulated LED
In lamp group, then send with the form of optical signal；At receiving terminal, after receiving optical signal, to optical signal
Be demodulated, i.e. reduction obtains this data.
During these data send, described sample circuit gathers described electric current and adjusts working as of metal-oxide-semiconductor two ends
Front magnitude of voltage U1, after described current voltage value U1 integration amplification, produces pincers pressure feedback voltage, then
Described pincers pressure feedback voltage is transferred to the comparison input of described self adaptation DC/DC translation circuit；Described from
Adaptation DC/DC translation circuit, by described pincers pressure feedback voltage is compared and judged, produces and clamps voltage-controlled system
Instruction, the magnitude of voltage that described electric current adjusts metal-oxide-semiconductor two ends clamps within maximum voltage value；It addition, it is described
Self adaptation DC/DC translation circuit, according to described pincers pressure feedback voltage and current loading condition, adjusts certainly automatically
The output voltage U2 of body, makes U2=U1+U3；Wherein, U3 is the terminal voltage value of present load.Reality should
In with, self adaptation DC/DC translation circuit output voltage can be to adjust in the range of the width of 7～36V.
By pincers pressure effect, the magnitude of voltage at metal-oxide-semiconductor two ends is made to clamp within maximum voltage value, self adaptation
DC/DC translation circuit, according to current loading condition, automatically adjusts the output voltage of self, has the advantage that
(1) improve the work efficiency of whole circuit；
(2) reduce electric current and adjust the power consumption of metal-oxide-semiconductor, it is not necessary to use extra fin, for a long time
Task driven circuit is without obvious temperature rise；
(3) for a LED communication drive circuit, it is adjusted by self adaptation DC/DC translation circuit defeated
Go out voltage, can freely mount several LED, meet varying number LED light source demand, there is use spirit
Live, visible light communication system designs simple advantage；It addition, the interference that it also avoid between different light source, carry
High white light communication quality.
It is exemplified below: the maximum voltage value at metal-oxide-semiconductor two ends is 0.3V, then only mounts when this communication drive circuit
During one LED, the constant current value of LED is 3A, and now, the terminal voltage value of LED is 3V, then:
Self adaptation DC/DC translation circuit is according to the magnitude of voltage needed for the LED of mounting, self adaptation output voltage
U2=0.3V+3V=3.3V；Now, effective power P1=3V*3A=9W of load；It is total that DC/DC exports
Power=3A*3.3V=9.9W；The work efficiency of whole circuit is: 9W/9.9W=90.9%.And for uneasiness
The LED drive circuit of the voltage clamping circuit of the dress present invention, electric power output voltage value is usually 30V, and is fixing
Constant, then: output power of power supply=30V*3A=90W；Now, the work efficiency of whole circuit is: 9
W/90W=10%.As can be seen here, white light LEDs communication drive circuit provided by the present invention, there is work
The advantage that efficiency is high.
It addition, for white light LEDs communication drive circuit provided by the present invention, the power consumption of metal-oxide-semiconductor is:
0.3V*3A=0.9W；And for not installing the LED drive circuit of the voltage clamping circuit of the present invention, metal-oxide-semiconductor
Power consumption is: 27V*3A=81W；Visible, for not installing the LED drive circuit of the voltage clamping circuit of the present invention,
The power consumption of metal-oxide-semiconductor is very big, accordingly, it would be desirable to use extra fin, reduces the temperature of metal-oxide-semiconductor.
And in the present invention, the power consumption of metal-oxide-semiconductor is the least, so, it is not necessary to use extra fin.
It addition, after S1, also include:
S2b, described current sampling circuit gathers described electric current and adjusts the output current value of metal-oxide-semiconductor drain side,
After described output current value is amplified, obtain current signal I1, then described current signal I1 is transferred to institute
State the first input end driving matrix current adjustment circuit；
Described controller produces digital quantity reference value, described digital quantity reference value is changed by D/A converter
For analog quantity reference value, then described analog quantity reference value is transferred to the of described driving matrix current adjustment circuit
Two inputs；
Described driving matrix current adjustment circuit compares the described current signal I1 and described analog quantity benchmark received
Value, produces driving instruction, drives described electric current to adjust the grid of metal-oxide-semiconductor by described driving instruction, changes
Described electric current adjusts the constant current output current value of metal-oxide-semiconductor drain side, thus reaches to adjust the mesh of LED luminance
's.
By this step, single-chip microcomputer uses automatic control mode, it is not necessary to changes hardware parameter, can change
The output electric current of white light LEDs communication drive circuit, thus meet the demand of different LED luminosity, have
Debug simple advantage, greatly optimize the conceptual design of visible light communication system.
In sum, the white light LEDs communication drive circuit of present invention offer and white light LEDs communication drivers method,
Have the advantage that the big electric current of driving, meet the demand of LED power, also there is high efficiency, energy
The advantage consume low, wide output voltage, mounting not determined number LED；Also have simple in construction, easy to control and
The advantage that modulation rate is high, can merge with visible light communication system well.
The above is only the preferred embodiment of the present invention, it is noted that common for the art
For technical staff, under the premise without departing from the principles of the invention, it is also possible to make some improvements and modifications,
These improvements and modifications also should regard protection scope of the present invention.
Claims (7)
1. a white light LEDs communication drive circuit, it is characterised in that including: self adaptation DC/DC converts
Circuit, voltage clamping circuit and current control circuit；The input of described self adaptation DC/DC translation circuit for
Power supply connects；The outfan of described self adaptation DC/DC translation circuit and the first input end of described voltage clamping circuit
Connect；First outfan of described voltage clamping circuit is for being connected with the input of LED group；Described pincers piezoelectricity
The second outfan feedback link on road is to described self adaptation DC/DC translation circuit；At described voltage clamping circuit
Connect in supply line between one outfan with described LED group described current control circuit；
Wherein, described voltage clamping circuit includes that electric current adjusts metal-oxide-semiconductor, sample circuit, signal integration circuit and puts
Big circuit；Described electric current adjusts the source electrode of metal-oxide-semiconductor and the outfan of described self adaptation DC/DC translation circuit
Connect；Described electric current adjusts the drain electrode of metal-oxide-semiconductor and is connected with the input of described LED group；Described sampling
The input of circuit adjusts source electrode and the leakage of described electric current adjustment metal-oxide-semiconductor of metal-oxide-semiconductor respectively with described electric current
Pole connects, and the outfan of described sample circuit is connected with the input of described signal integration circuit；Described signal
The outfan of integrating circuit is connected with the input of described amplifying circuit；The outfan feedback of described amplifying circuit
It is connected to the input of described self adaptation DC/DC translation circuit.
White light LEDs communication drive circuit the most according to claim 1, it is characterised in that described electricity
Flow control circuit includes: controller, D/A converter, current sampling circuit, signal amplification circuit and driving
Matrix current adjustment circuit；Described current sampling circuit is arranged on described electric current and adjusts the drain electrode of metal-oxide-semiconductor with described
In supply line between LED group, the outfan of described current sampling circuit and described signal amplification circuit
Input connect, the outfan of described signal amplification circuit is defeated with the first of described driving matrix current adjustment circuit
Entering end to connect, the outfan of described controller is connected to described driving electric current by described D/A converter and adjusts
Second input of circuit, the outfan of described driving matrix current adjustment circuit adjusts metal-oxide-semiconductor with described electric current
Grid connects.
White light LEDs communication drive circuit the most according to claim 2, it is characterised in that described control
Device processed is single-chip microcomputer.
White light LEDs communication drive circuit the most according to claim 1, it is characterised in that described electricity
Source is Switching Power Supply.
5. the white light LEDs communication being applied to white light LEDs communication drive circuit described in claim 3 is driven
Dynamic method, it is characterised in that comprise the following steps:
S1, is installed to the confession to described LED group of the described power supply by described white light LEDs communication drive circuit
In electric line；
S2a, when needs transmission data, modulates data in LED group, finally with the shape of optical signal
These data are sent by formula；
During these data send, described sample circuit gathers described electric current and adjusts working as of metal-oxide-semiconductor two ends
Front magnitude of voltage U1, after described current voltage value U1 integration amplification, produces pincers pressure feedback voltage, then
Described pincers pressure feedback voltage is transferred to the comparison input of described self adaptation DC/DC translation circuit；Described from
Adaptation DC/DC translation circuit, by described pincers pressure feedback voltage is compared and judged, produces and clamps voltage-controlled system
Instruction, the magnitude of voltage that described electric current adjusts metal-oxide-semiconductor two ends clamps within maximum voltage value；It addition, it is described
Self adaptation DC/DC translation circuit, according to described pincers pressure feedback voltage and current loading condition, adjusts certainly automatically
The output voltage U2 of body, makes U2=U1+U3；Wherein, U3 is the terminal voltage value of present load.
White light LEDs communication drivers method the most according to claim 5, it is characterised in that after S1,
Also include:
S2b, described current sampling circuit gathers described electric current and adjusts the output current value of metal-oxide-semiconductor drain side,
After described output current value is amplified, obtain current signal I1, then described current signal I1 is transferred to institute
State the first input end driving matrix current adjustment circuit；
Described controller produces digital quantity reference value, described digital quantity reference value is changed by D/A converter
For analog quantity reference value, then described analog quantity reference value is transferred to the of described driving matrix current adjustment circuit
Two inputs；
Described driving matrix current adjustment circuit compares the described current signal I1 and described analog quantity benchmark received
Value, produces driving instruction, drives described electric current to adjust the grid of metal-oxide-semiconductor by described driving instruction, changes
Described electric current adjusts the constant current output current value of metal-oxide-semiconductor drain side.
White light LEDs communication drivers method the most according to claim 5, it is characterised in that in S2a,
Described modulate data on LED group particularly as follows:
When single-chip microcomputer receives, by serial ports, the data needing to send, by I/O port by described data with 0,1
Form control electric current adjusts the break-make of metal-oxide-semiconductor grid, thus these data is modulated in LED group.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201310311480.9A CN104349526B (en) | 2013-07-23 | 2013-07-23 | White light LEDs communication drive circuit and white light LEDs communication drivers method |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310311480.9A CN104349526B (en) | 2013-07-23 | 2013-07-23 | White light LEDs communication drive circuit and white light LEDs communication drivers method |
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| CN104349526B true CN104349526B (en) | 2016-09-14 |
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101833929A (en) * | 2010-05-11 | 2010-09-15 | 福建捷联电子有限公司 | Single-string LED lamp tube push-pull type direct-current high-voltage drive circuit of liquid-crystal display |
| CN102740572A (en) * | 2012-07-18 | 2012-10-17 | 广州凯盛电子科技有限公司 | Driving power supply control circuit |
| CN103118454A (en) * | 2011-09-23 | 2013-05-22 | 英飞凌科技股份有限公司 | Digital switching converter control |
| CN203327342U (en) * | 2013-07-23 | 2013-12-04 | 北京华通时空通信技术有限公司 | White-light LED communication drive circuit |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105246194B (en) * | 2011-11-15 | 2018-07-03 | 昂宝电子（上海）有限公司 | For the LED illumination System and method of the current constant control in various operation modes |
-
2013
- 2013-07-23 CN CN201310311480.9A patent/CN104349526B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101833929A (en) * | 2010-05-11 | 2010-09-15 | 福建捷联电子有限公司 | Single-string LED lamp tube push-pull type direct-current high-voltage drive circuit of liquid-crystal display |
| CN103118454A (en) * | 2011-09-23 | 2013-05-22 | 英飞凌科技股份有限公司 | Digital switching converter control |
| CN102740572A (en) * | 2012-07-18 | 2012-10-17 | 广州凯盛电子科技有限公司 | Driving power supply control circuit |
| CN203327342U (en) * | 2013-07-23 | 2013-12-04 | 北京华通时空通信技术有限公司 | White-light LED communication drive circuit |
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