CN105848372A - Multi-lamp networking drive circuit and method for visible communication - Google Patents
Multi-lamp networking drive circuit and method for visible communication Download PDFInfo
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- CN105848372A CN105848372A CN201510011508.6A CN201510011508A CN105848372A CN 105848372 A CN105848372 A CN 105848372A CN 201510011508 A CN201510011508 A CN 201510011508A CN 105848372 A CN105848372 A CN 105848372A
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Abstract
The invention discloses a multi-lamp networking drive circuit and method for visible communication, and the drive circuit comprises a transmission main controller. A differential transmitting circuit in the transmission main controller enables a single-end signal to be converted into a differential signal, and is connected with an input end of each transmission branch controller through a transmission main controller. The transmission branch controllers are respectively provided with a parallel output end, and the input end of the adjacent transmission branch controller is connected with the parallel output end of the other transmission branch controller. The input end of the transmission branch controller is a differential signal receiving circuit, and the differential signal receiving circuit converts the signal into a single-end signal which is the same as a visible modulated electric signal A. The single-end signal is electrically isolated by the output end of the differential signal receiving circuit, and then is outputted to the input end of a modulation driver. The modulation driver is a switching capacitor type square-wave effective-value constant-current driver, and a signal B of the input end of the modulation driver is the same as the visible modulated electric signal A. The circuit achieves the high-efficiency electro-optic conversion of the visible communication signal, and meets the requirements of constant-current drive in an optimal drive mode of an LED illuminating light source.
Description
Technical field
The present invention relates to technical field of visible light communication, be specifically related to a kind of for visible light communication
Many light fixtures networking drive circuit and driving method.
Background technology
In the prior art, LED illumination light source that is ripe and that produced in enormous quantities is utilized
(as LED fluorescent lamp tube, LED flat lamp, LED lamp affixed to the ceiling, LED, LED lamp bar,
LED spotlight, LED string, LED down etc.) as the signal transmitting unit of visible light communication,
The cost of visible light communication will be reduced, reduce the door that visible light communication technology comes into the market
Bank, the penetration and promotion speed of quickening visible light communication technology.By the modulation telecommunications of visible light communication
Number transmission is also loaded into and organizes LED illumination light source more, is key problem in technology and the difficulty realizing above-mentioned imagination
Point.
Summary of the invention
It is an object of the invention to provide one to be transferred to organize LED by visible ray modulation signal more
Lighting source, and while LED is carried out constant-current driving, load-modulate signal, by electricity
Signal is converted to the method for optical signal.Thus can be using existing multiple LED illumination light source as can
See the signal transmitting unit of optic communication.Cost is realized on the premise of ensureing high speed, high reliability
Cheap visible light communication system.
There is provided a kind of many light fixtures networking drive circuit for visible light communication, including for inputting
The transmission main controller of visible ray modulation signal A, is provided with signal isolation in described transmission main controller
Circuit, the difference transtation mission circuit being connected with isolation circuit output end, difference transtation mission circuit will be single
After end signal is converted to differential signal, by a pair twisted-pair feeder and in many transmission iversion controllers
Only the input of transmission iversion controller is connected, and every transmission iversion controller also has a Parallel opertation
End, the input of an adjacent transmission iversion controller and the parallel outputs of another transmission iversion controller
It is connected；The input of described transmission iversion controller is differential signal receiving circuit, and differential signal connects
Receive circuit and be again converted to the single-ended signal identical with visible ray modulation signal A, connect from difference
Receive the outfan output of circuit, carry out electrically insulating and exporting modulating driver through isolation circuit
On input；Signal B on the input of modulating driver is identical with visible ray modulated signal A；
Modulating driver is connected with LED illumination lamp.
Networking in drive circuit at above-mentioned many light fixtures for visible light communication, described modulation drives
Device is switched capacitor square wave virtual value constant-flow driver, by energy storing of switch electric capacity, at a high speed
Mosfet driver and high speed MOSFET power tube electrical connection composition；Modulating driver embeds
In LED illumination lamp；Constant-flow driver and LED group in LED illumination lamp change
After former connected mode with the energy storing of switch electric capacity in modulating driver, high-speed MOSFET driver device,
High speed MOSFET power tube is reintegrated and is connected；Energy storing of switch electric capacity is parallel to constant-current driving
The outfan of device, LED group is connected on positive output end and the high speed MOSFET merit of constant-flow driver
In the drain D of rate pipe, the source S of MOSFET power tube and the negative output terminal of constant-flow driver
Outfan connected, that grid G receives high-speed MOSFET driver device；Visible ray modulated signal B
Receive on the input of high-speed MOSFET driver device, drive through electric current, output signal is added to
The grid G of MOSFET power tube, controls fast conducting and the cut-off of MOSFET power tube.
There is provided a kind of many light fixtures networking driving method for visible light communication, including walking as follows
Rapid:
(1) visible ray modulation signal A is added to transmit the signal isolation circuit 11 of main controller 1
Input, through electric isolution from isolation circuit 11 outfan receive difference transtation mission circuit 12
On input.After single-ended signal being converted to differential signal by difference transtation mission circuit, it is added in one
It is transmitted on twisted-pair feeder 2.
(2) input of many other transmission iversion controllers 3 of many group LED illumination lamp it is positioned at also
It is coupled on twisted-pair feeder 2；Enter the differential signal of input of transmission iversion controller 3 through differential received
Circuit 32 is converted to the single-ended signal identical with visible ray modulation signal A again, from difference
Receive the outfan output of circuit 32, carry out electrically insulating and exporting modulation through isolation circuit 31
On the input of driver 4.Signal B on the input of modulating driver 4 adjusts with visible ray
Signal A processed is identical.
(3) modulating driver 4 is switched capacitor square wave virtual value constant-flow driver, by opening
Close storage capacitor 41, high-speed MOSFET driver device 42 and high speed MOSFET power tube 43 groups
Become.Modulating driver 4 is embedded in LED illumination lamp 5.In LED illumination lamp 5
Constant-flow driver 51 and LED group 52 change after former connected mode with in modulating driver 4
Energy storing of switch electric capacity 41, high-speed MOSFET driver device 42, high speed MOSFET power tube 43 weight
Newly integrate and be connected.Energy storing of switch electric capacity 41 is parallel to the outfan of constant-flow driver 51, LED
Lamp group 52 is connected on the positive output end of constant-flow driver 51 and the leakage of high speed MOSFET power tube 43
On the D of pole, the negative output terminal phase of the source S of MOSFET power tube 43 and constant-flow driver 51
Even, grid G receives the outfan of high-speed MOSFET driver device 42.Visible ray modulated signal B
Receive on the input of high-speed MOSFET driver device 42, drive through electric current, output signal is added
To the grid G of MOSFET power tube 43, control the fast conducting of MOSFET power tube and cut
Only.Export at constant-flow driver 51, energy storing of switch electric capacity 41, mosfet driver 42 and
Under the common effect of the MOSFET power tube 43 being on off state, LED group 52 flows
The square wave current virtual value crossed is equal with the electric current that constant-flow driver exports, and reaching square wave current has
The effect that valid value is constant.Both met the needs of LED group constant-current driving, achieved again visible
The high efficiency electrical/optical conversion of optic communication signal.
Transmission iversion controller, modulating driver and LED illumination lamp are deposited with many groups form after connecting
?.It is one group as transmitted iversion controller 3, modulating driver 4 and LED illumination lamp 5, transmission
Iversion controller 6, modulating driver 7 and LED illumination lamp 8 are another group, etc..Maximum group
Number is up to 32-256.Transmission main controller 1, many group transmission iversion controllers, modulating driver and LED
Lighting is generally individually positioned at (or inside furred ceiling) on the ceiling at light source place.Transmission master control
The connected mode of device 1 and transmission iversion controller is point to multi--point.Transmission main controller 1 is with broadcaster
Visible ray modulation signal A transmission is the most only transmitted iversion controller by formula, then be modulated driver,
Modulation signal is converted to visible light communication optical signal by LED illumination lamp, and sends to LED
In the illumination region that lighting light source is covered.
Transmission main controller is with the transmission difference transtation mission circuit of iversion controller, differential received circuit can be direct
Utilize existing RS-485 and M-LVDS technology.Very wide, the covering in LED illumination light source distribution
Area the biggest and apart from each other in the case of use the transceiving chip of RS-485.Lead to requiring
Speed is the highest and LED illumination light source uses the transmitting-receiving of M-LVDS in the case of the nearest for letter
Chip.
The present invention isolates circuit and can use Phototube Coupling, Magnetic isolation and the number of Capacitor apart mode
Word isolation circuit.
LED constant-current driver, LED group in LED illumination lamp can use special LED
Lamp group and LED constant-current driver, it is possible to directly use above-mentioned portion contained in existing LED lamp
Part.Wherein LED group can use tandem type or connection in series-parallel combined, and LED constant-current driver can
Use the various circuit forms such as the switch mode constant current of AC or DC input, linear constant current.
The present invention compared with prior art, has clear advantage and an effect: visible electro optic modulator
Signal is transmitted in a differential manner by RS-485 technology or M-LVDS technology and is distributed, energy
The effectively electromagnetic interference of suppression self, have that anti-external disturbance ability is strong, communication range big, away from
Feature high with transmission speed away from from.A transmission main controller can be realized to up to 32-256 group
The Point To Multipoint Multicast formula signal transmission of LED lamp.Due to before difference transtation mission circuit and difference
Receive after circuit and employ isolation circuit, make visible light communication system hop and system its
Its part isolation, serves the effect that security isolation, noise isolation and ground loop eliminate, anti-
Interference performance improves further, and can prevent surge voltage, the peak voltage destruction to system.
The capacitance switch formula square wave virtual value constant current method that modulating driver uses, not only achieves visible
The high efficiency electrical/optical conversion of optic communication signal, the most also meets LED illumination light source
The requirement of good type of drive-constant-current driving.In a word, the one that the present invention provides is for visible ray
Many light fixtures networking of communication and driving method, can directly utilize ripe and produce in enormous quantities
Many groups LED illumination light source, on the premise of not affecting illumination performance, it is achieved that high efficiency
Visible light communication signal modulation, have the signal of telecommunication transmit reliable and stable, optical signal area coverage
Big and that system cost is low, installation enforcement quantities is little feature, can promote visible light communication skill
The popularization and application of art.
Accompanying drawing explanation
Fig. 1 is the schematic block circuit diagram of the present invention.
Fig. 2 is that the modulating driver of the present invention uses electric current to flow out (Current Source) pattern
Connection circuit theory diagrams with LED illumination lamp.
Fig. 3 is the another kind of topological structure modulating driver of the present invention, uses electric current to flow into
(Current Sink) pattern and the connection circuit theory diagrams of LED illumination lamp.
Labelling in figure: 1: transmission main controller, 11: isolation circuit, 12: difference transtation mission circuit；
2: twisted-pair feeder；3: transmission iversion controller, 32: differential received circuit, 31: isolation circuit；
4: modulating driver；5:LED lighting, 51:LED constant-flow driver, 52:LED
Lamp group.
Detailed description of the invention
Embodiment one: with reference to shown in Fig. 1, Fig. 2: provide a kind of many for visible light communication
Group LED lamp networking drive circuit and driving method, including for inputting visible ray modulation telecommunications
The transmission main controller 1 of number A, is provided with signal isolation circuit 11 in described transmission main controller 1, with
The difference transtation mission circuit 12 that isolation circuit 11 outfan is connected, difference transtation mission circuit 12 will
After single-ended signal is converted to differential signal, by a pair twisted-pair feeder 2 and many transmission iversion controllers 3
In one transmission iversion controller 3 input be connected, every transmission iversion controller 3 also have one
Parallel outputs, the input of an adjacent transmission iversion controller 3 transmits iversion controller 3 with another
Parallel outputs be connected；The input of described transmission iversion controller 3 is that differential signal receives electricity
Road 32, differential signal receiving circuit 32 is converted to identical with visible ray modulation signal A again
Single-ended signal, export from the outfan of differential received circuit 32, carry out through isolation circuit 31
Electrically insulate and export on the input of modulating driver 4；On the input of modulating driver 4
Signal B identical with visible ray modulated signal A；Modulating driver is with LED illumination lamp 5 even
Connect.
Networking in drive circuit at above-mentioned many light fixtures for visible light communication, described modulation drives
Device 4 is switched capacitor square wave virtual value constant-flow driver 51, by energy storing of switch electric capacity 41,
High-speed MOSFET driver device 42 and high speed MOSFET power tube 43 electrical connection composition；Modulation is driven
Dynamic device 4 is embedded in LED illumination lamp；Constant-flow driver 51 He in LED illumination lamp
LED group change after former connected mode with the energy storing of switch electric capacity in modulating driver, at a high speed
Mosfet driver, high speed MOSFET power tube are reintegrated and are connected；Energy storing of switch electric capacity
Be parallel to the outfan of constant-flow driver, LED group be connected on the positive output end of constant-flow driver with
In the drain D of high speed MOSFET power tube, the source S of MOSFET power tube and constant-current driving
The negative output terminal of device is connected, grid G receives the outfan of high-speed MOSFET driver device；Visible
Light modulating signal B receives on the input of high-speed MOSFET driver device, drives through electric current, will
Output signal is added to the grid G of MOSFET power tube, controls quickly leading of MOSFET power tube
Lead to and cut-off.
There is provided a kind of many light fixtures networking driving method for visible light communication, including walking as follows
Rapid:
(1) visible ray modulation signal A is added to transmit the signal isolation circuit of main controller 1
The input of 11, receives difference transtation mission circuit 12 through electric isolution from the outfan of isolation circuit 11
Input on.After single-ended signal being converted to differential signal by difference transtation mission circuit, it is added in
It is transmitted on a pair twisted-pair feeder 2；
(2) it is provided with the input of many transmission iversion controllers 3 corresponding with organizing LED illumination lamp more
End is parallel on twisted-pair feeder 2.Enter the differential signal of input of transmission iversion controller 3 through difference
Receive circuit 32 and be again converted to the single-ended signal identical with visible ray modulation signal A, from
The outfan output of differential received circuit 32, carries out electrically insulating and exporting through isolation circuit 31
On the input of modulating driver 4.Signal B on the input of modulating driver 4 is with visible
Light modulating signal A is identical.
(3) modulating driver 4 is switched capacitor square wave virtual value constant-flow driver, by opening
Close storage capacitor 41, high-speed MOSFET driver device 42 and high speed MOSFET power tube 43 groups
Become；Modulating driver 4 is embedded in LED illumination lamp 5.In LED illumination lamp 5
Constant-flow driver 51 and LED group 52 change after former connected mode with in modulating driver 4
Energy storing of switch electric capacity 41, high-speed MOSFET driver device 42, high speed MOSFET power tube 43 weight
Newly integrate and be connected；In constant-flow driver 51, constant-current source is connected into " outflow " (Current Source)
Pattern.Energy storing of switch electric capacity 41 is parallel to the outfan of constant-flow driver 51, LED group 52
Be connected on the positive output end of constant-flow driver 51 and high speed MOSFET power tube 43 drain D it
Between, the source S of MOSFET power tube 43 is connected with the negative output terminal of constant-flow driver 51,
Grid G receives the outfan of high-speed MOSFET driver device 42.Visible ray modulated signal B is received
On the input of high-speed MOSFET driver device 42, drive through electric current, output signal is added to
The grid G of MOSFET power tube 43, controls fast conducting and the cut-off of MOSFET power tube.
Export at constant-flow driver 51, energy storing of switch electric capacity 41, mosfet driver 42 and be in
Under the common effect of the MOSFET power tube 43 of on off state, LED group 52 flows through
The electric current that square wave current virtual value exports with constant-flow driver is equal, reaches square wave current virtual value
Constant effect.Both met the needs of LED group constant-current driving, and achieved again visible ray and lead to
The high efficiency electrical/optical conversion of letter signal.
(4) to organize shape after transmission iversion controller, modulating driver and LED illumination lamp connect more
Formula exists.It is one group as transmitted iversion controller 3, modulating driver 4 and LED illumination lamp 5,
Transmission iversion controller 6, modulating driver 7 and LED illumination lamp 8 are another group, etc..?
Big group number is up to 32-256.Transmission main controller 1, many group transmission iversion controller, modulating driver
With on the ceiling that LED illumination lamp is generally individually positioned at light source place (or inside furred ceiling).Pass
The connected mode of defeated main controller 1 and transmission iversion controller is point to multi--point.Transmission main controller 1 with
Visible ray modulation signal A transmission is the most only transmitted iversion controller by broadcast mode, then is modulated and drives
Modulation signal is converted to visible light communication optical signal by dynamic device, LED illumination lamp, and sends
To the illumination region that LED illumination lamp light source is covered.
(5) transmission main controller and transmission the difference transtation mission circuit of iversion controller, differential received circuit
Existing RS-485 and M-LVDS technology can be directly utilized.Very wide in LED illumination light source distribution,
Area coverage the biggest and apart from each other in the case of use the transceiving chip of RS-485.Wanting
Ask traffic rate the highest and LED illumination light source uses M-LVDS's in the case of relatively near
Transceiving chip.
(6) present invention isolates circuit and can use Phototube Coupling, Magnetic isolation and Capacitor apart side
The numeral isolation circuit of formula.
(7) LED constant-current driver in LED illumination lamp, LED group can use special
LED group and LED constant-current driver, it is possible to directly use in existing LED lamp contained upper
State parts.Wherein LED group can use tandem type or connection in series-parallel combined, and LED constant current drives
Device can use the various circuit forms such as switch mode constant current, the linear constant current that AC or DC inputs.
Modulating driver
Embodiment two: with reference to shown in Fig. 3 is the modulating driver using electric current inflow pattern with
The connection circuit theory diagrams of LED illumination lamp.
Use the modulating driver of electric current inflow pattern and the connection circuit of LED illumination lamp；Adjust
Driver 4 processed is switched capacitor square wave virtual value constant-flow driver, by energy storing of switch electric capacity
41, high-speed MOSFET driver device 42 and high speed MOSFET power tube 43 form.Modulation drives
Device 4 is embedded in LED illumination lamp 5.Constant-flow driver 51 in LED illumination lamp 5
With LED group 52 change after former connected mode with the energy storing of switch electric capacity in modulating driver 4
41, high-speed MOSFET driver device 42, high speed MOSFET power tube 43 are reintegrated and are connected.
In constant-flow driver 51, constant-current source connects into " inflow " (Current Sink) pattern.Switch
Storage capacitor 41 be parallel to constant-flow driver 51 Constant current input end and publicly between, LED
Lamp group 52 is connected on power supply positive supply and the high speed MOSFET power tube 43 of constant-flow driver 51
Between drain D, the source S of MOSFET power tube 43 is defeated with the constant current of constant-flow driver 51
Enter the outfan that end is connected, grid G receives high-speed MOSFET driver device 42.Visible ray is modulated
Signal B receives on the input of high-speed MOSFET driver device 42, drives through electric current, will output
Signal is added to the grid G of MOSFET power tube 43, controls quickly leading of MOSFET power tube
Lead to and cut-off.Drive at constant-flow driver 51 constant current input, energy storing of switch electric capacity 41, MOSFET
Under the common effect of the MOSFET power tube 43 moving device 42 and be on off state, LED
The square wave current virtual value flow through in group 52 is equal with the electric current I1 that constant-flow driver inputs, and reaches
To the effect that square wave current virtual value is constant.
Foregoing circuit had both met the needs of LED group constant-current driving, achieves again visible ray and leads to
The high efficiency electrical/optical conversion of letter signal.
Claims (6)
1. the many light fixtures networking drive circuit for visible light communication, it is characterised in that:
Including the transmission main controller for inputting visible ray modulation signal A, in described transmission main controller
It is provided with signal isolation circuit, the difference transtation mission circuit being connected with isolation circuit output end, difference
After single-ended signal is converted to differential signal by transtation mission circuit, by a pair twisted-pair feeder and many transmission
The input of a transmission iversion controller in iversion controller is connected, and every transmission iversion controller also has
One parallel outputs, the input of an adjacent transmission iversion controller and another transmission iversion controller
Parallel outputs is connected；The input of described transmission iversion controller is differential signal receiving circuit,
Differential signal receiving circuit is converted to the single-ended letter identical with visible ray modulation signal A again
Number, export from the outfan of differential received circuit, carry out electrically insulating and exporting through isolation circuit
On the input of modulating driver；Signal B on the input of modulating driver adjusts with visible ray
Signal A processed is identical；Modulating driver is connected with LED illumination lamp.
Many light fixtures for visible light communication the most according to claim 1 are networked and are driven electricity
Road, it is characterised in that: modulating driver is switched capacitor square wave virtual value constant-flow driver,
It is made up of energy storing of switch electric capacity, high-speed MOSFET driver device and high speed MOSFET power tube；Adjust
Driver processed is embedded in LED illumination lamp；Constant-flow driver in LED illumination lamp and LED
With the energy storing of switch electric capacity in modulating driver, high speed MOSFET after the lamp group former connected mode of change
Driver, high speed MOSFET power tube are reintegrated and are connected；Constant current in constant-flow driver
Source is connected into " outflow " pattern；Energy storing of switch electric capacity is parallel to the outfan of constant-flow driver, LED
Lamp group is connected between the positive output end of constant-flow driver and the drain D of high speed MOSFET power tube,
The source S of MOSFET power tube is connected with the negative output terminal of constant-flow driver, grid G is received
The outfan of high-speed MOSFET driver device；Visible ray modulated signal B is received high speed MOSFET and is driven
On the input of dynamic device, drive through electric current, output signal is added to the grid of MOSFET power tube
Pole G, controls fast conducting and the cut-off of MOSFET power tube.
Many light fixtures for visible light communication the most according to claim 1 are networked and are driven electricity
Road, it is characterised in that: described modulating driver is to use electric current inflow pattern modulating driver
Switched capacitor square wave virtual value constant-flow driver, by energy storing of switch electric capacity, high speed MOSFET
Driver and high speed MOSFET power tube composition；Modulating driver is embedded in LED illumination lamp
In；Constant-flow driver in LED illumination lamp and LED group change after former connected mode with tune
Energy storing of switch electric capacity in driver processed, high-speed MOSFET driver device, high speed MOSFET power
Pipe is reintegrated and is connected；In constant-flow driver, constant-current source connects into " inflow " pattern；Switch
Storage capacitor be parallel to constant-flow driver Constant current input end and publicly between, LED group
It is connected between power supply positive supply and the drain D of high speed MOSFET power tube of constant-flow driver,
The source S of MOSFET power tube is connected with the constant current input of constant-flow driver, grid G connects
Outfan to high-speed MOSFET driver device；Visible ray modulated signal B receives high speed MOSFET
On the input of driver, drive through electric current, output signal is added to MOSFET power tube
Grid G, controls fast conducting and the cut-off of MOSFET power tube.
4. the many light fixtures networking driving method for visible light communication, it is characterised in that:
Comprise the steps:
(1) visible ray modulation signal A is added to transmit the signal isolation circuit of main controller 1
The input of 11, receives the defeated of difference transtation mission circuit through electric isolution from the outfan of isolation circuit
Enter on end.After single-ended signal being converted to differential signal by difference transtation mission circuit, it is added in a pair
It is transmitted on twisted-pair feeder；
(2) input being positioned at many other transmission iversion controllers of many group LED illumination lamp is in parallel
On twisted-pair feeder；Enter the differential signal of input of transmission iversion controller through differential received circuit weight
Newly be converted to the single-ended signal identical with visible ray modulation signal A, from differential received circuit
Outfan exports, and carries out electrically insulating and exporting the input of modulating driver through isolation circuit
On.Signal B on the input of modulating driver 4 is identical with visible ray modulated signal A；
(3) modulating driver is switched capacitor square wave virtual value constant-flow driver, by switching
Storage capacitor, high-speed MOSFET driver device and high speed MOSFET power tube composition；Modulation drives
Device is embedded in LED illumination lamp；Constant-flow driver in LED illumination lamp and LED group
Drive with the energy storing of switch electric capacity in modulating driver, high speed MOSFET after changing former connected mode
Dynamic device, high speed MOSFET power tube are reintegrated and are connected；Constant-current source in constant-flow driver
It is connected into " outflow " pattern；Energy storing of switch electric capacity is parallel to the outfan of constant-flow driver, LED
Lamp group is connected between the positive output end of constant-flow driver and the drain D of high speed MOSFET power tube,
The source S of MOSFET power tube is connected with the negative output terminal of constant-flow driver, grid G is received
The outfan of high-speed MOSFET driver device；Visible ray modulated signal B is received high speed MOSFET and is driven
On the input of dynamic device, drive through electric current, output signal is added to the grid of MOSFET power tube
Pole G, controls fast conducting and the cut-off of MOSFET power tube.
A kind of many light fixtures for visible light communication the most according to claim 4 are networked and are driven
Dynamic method, it is characterised in that: described transmission iversion controller, modulating driver and LED illumination lamp
Arrange with many group forms after connection；As transmitted iversion controller, modulating driver and LED illumination lamp
Being one group, transmission iversion controller, modulating driver and LED illumination lamp are another group, maximum group
Number is up to 32-256；Transmission main controller, many group transmission iversion controllers, modulating driver and LED
Lighting is generally individually positioned on the ceiling at light source place；Transmission main controller and transmission iversion controller
Connected mode be point to multi--point；Visible ray is modulated telecommunications with broadcast mode by transmission main controller
Iversion controller is the most only transmitted in number A transmission, then be modulated driver, LED illumination lamp will modulation
The signal of telecommunication is converted to visible light communication optical signal, and sends to LED illumination lamp light source and covered
Illumination region in；
Described transmission main controller and transmission iversion controller difference transtation mission circuit, differential received circuit can
Use existing RS-485 and M-LVDS technology；Very wide, the covering in LED illumination light source distribution
Area the biggest and apart from each other in the case of use the transceiving chip of RS-485；Lead to requiring
Speed is the highest and LED illumination light source uses the transmitting-receiving of M-LVDS in the case of the nearest for letter
Chip.
A kind of many light fixtures for visible light communication the most according to claim 4 are networked and are driven
Dynamic method, it is characterised in that: isolation circuit can be the one in lower column circuits: Phototube Coupling,
The numeral isolation circuit of Magnetic isolation and Capacitor apart mode；LED constant-current driver, LED group
Can use special LED group and LED constant-current driver, wherein LED group can use series connection
Type or connection in series-parallel are combined, and LED constant-current driver can use the switching regulator that AC or DC inputs
Constant current, linear constant current circuit form.
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| CN201510011508.6A CN105848372A (en) | 2015-01-12 | 2015-01-12 | Multi-lamp networking drive circuit and method for visible communication |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN108122393A (en) * | 2016-11-30 | 2018-06-05 | 深圳市海洋王照明工程有限公司 | A kind of lighting apparatus and its data transmission method |
| JP2018200762A (en) * | 2017-05-25 | 2018-12-20 | パナソニックＩｐマネジメント株式会社 | Lighting device, luminaire, and signboard |
| CN111565489A (en) * | 2020-05-28 | 2020-08-21 | 宁波工程学院 | LED drive circuit with independently controllable illumination and visible light communication |
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