CN110087358A - A kind of lighting control system and lamps and lanterns - Google Patents
A kind of lighting control system and lamps and lanterns Download PDFInfo
- Publication number
- CN110087358A CN110087358A CN201810072015.7A CN201810072015A CN110087358A CN 110087358 A CN110087358 A CN 110087358A CN 201810072015 A CN201810072015 A CN 201810072015A CN 110087358 A CN110087358 A CN 110087358A
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- lighting
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- power supply
- group
- control system
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Classifications
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B45/00—Circuit arrangements for operating light-emitting diodes [LED]
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B47/00—Circuit arrangements for operating light sources in general, i.e. where the type of light source is not relevant
- H05B47/10—Controlling the light source
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- Circuit Arrangement For Electric Light Sources In General (AREA)
Abstract
The present invention is suitable for lighting technical field, provides a kind of lighting control system and lamps and lanterns, comprising: drive module, control module, lighting module, the first connector group and the second connector group；Drive module is connect with control module by the first connector group；Drive module is connect with lighting module by the second connector group；Drive module selects the lighting method of lighting module according to the instruction of control module；The lighting method of lighting module includes spotlighting and floodlighting.Through the invention, so that lighting control system can satisfy the lighting demand under several scenes.
Description
Technical field
The invention belongs to lighting technical field more particularly to a kind of lighting control system and lamps and lanterns.
Background technique
The characteristic that light with movable is convenient for carrying due to it has filled up the white space that city's electric lighting can not touch.With
The expansion of application field and market, more stringent requirements are proposed to light with movable by user.
However, existing movable illumination device can only adjust the luminous intensity of lamps and lanterns, but in some scenes, only adjust
Luminous intensity is not able to satisfy lighting demand.
Summary of the invention
In view of this, the embodiment of the invention provides a kind of lighting control system and lamps and lanterns, to solve to move in the prior art
Dynamic illuminator is not able to satisfy the problem of lighting demand.
First aspect of the embodiment of the present invention provides a kind of lighting control system, comprising: drive module, control module, photograph
Bright module, the first connector group and the second connector group；
The drive module is connect with the control module by the first connector group；
The drive module is connect with the lighting module by the second connector group；
The drive module selects the lighting method of the lighting module according to the instruction of the control module；
The lighting method of the lighting module includes spotlighting and floodlighting.
Second aspect of the embodiment of the present invention provides a kind of lamps and lanterns, including above-mentioned lighting control system.
Existing beneficial effect is the embodiment of the present invention compared with prior art: by installing a variety of light in drive module
Driving method meet the lighting demand under different scenes to realize a variety of light illumination modes.
Detailed description of the invention
It to describe the technical solutions in the embodiments of the present invention more clearly, below will be to embodiment or existing skill
Attached drawing needed in art description is briefly described, it should be apparent that, the accompanying drawings in the following description is only
It is some embodiments of the present invention, for those of ordinary skill in the art, without any creative labor,
It is also possible to obtain other drawings based on these drawings.
Fig. 1 is the structural schematic diagram for the lighting control system that first embodiment of the invention provides；
Fig. 2 is the concrete structure schematic diagram for the lighting control system that second embodiment of the invention provides；
Fig. 3 is the electrical block diagram of the second power supply unit in Fig. 2；
Fig. 4 is the electrical block diagram of the second built-in power part of third power supply unit in Fig. 2；
Fig. 5 is the electrical block diagram of the second singlechip wake-up circuit part of third power supply unit in Fig. 2.
Specific embodiment
In being described below, for illustration and not for limitation, the tool of such as particular system structure, technology etc is proposed
Body details, to understand thoroughly the embodiment of the present invention.However, it will be clear to one skilled in the art that there is no these specific
The present invention also may be implemented in the other embodiments of details.In other situations, it omits to well-known system, device, electricity
The detailed description of road and method, in case unnecessary details interferes description of the invention.
In order to illustrate technical solutions according to the invention, the following is a description of specific embodiments.
Embodiment one
Fig. 1 shows the structural schematic diagram of the lighting control system of first embodiment of the invention offer, for ease of description,
Only the parts related to this embodiment are shown, and details are as follows:
A kind of lighting control system, comprising: drive module 1, control module 2, lighting module 3, the first connector group 4 and
Two connector groups 5；The drive module 1 is connect with the control module 2 by the first connector group 4；The driving mould
Block 1 is connect with the lighting module 3 by the second connector group 5；The drive module 1 is according to the control module 2
Instruction selects the lighting method of the lighting module 3；The lighting method of the lighting module 3 includes that spotlighting and floodlight shine
It is bright.
The spotlighting refers to a kind of spotlight good to the convergence effect of light, uses 4 LED light in the present embodiment
Pearl and drive module 1 realize spotlighting；The floodlighting is a kind of to keep outdoor target or place brighter than ambient enviroment
Bright illumination realizes floodlighting using 6 LED lamp beads and drive module 1 in the present embodiment.
It should be noted that the first connector group 4 is made of two the first connectors, one is arranged in drive module 1,
Another is arranged in lighting module 3.Similarly, the second connector group 5 is made of two the second connectors, and a setting is driving
In module 1, another is arranged in control module 2.Connection relationship between two connectors is by connecting terminal or aerial right
Connecting terminal is constituted.
In the present embodiment, by installing the driving method of two kinds of light, two kinds for realizing lighting module in drive module
Light illumination mode, so that lighting control system is suitable for the lighting demand of various scenes.
Embodiment two
Fig. 2 gives the specific structure of the lighting control system of second embodiment of the invention offer, specific as follows:
A kind of lighting control system, including the drive module 1 in such as embodiment one, control module 2, lighting module 3, first
Connector group 4 and the second connector group 5, the drive module 1 are connected with the control module 2 by the first connector group 4
It connects；The drive module 1 is connect with the lighting module 3 by the second connector group 5；The drive module 1 is according to institute
The instruction for stating control module 2 selects the lighting method of the lighting module 3；The lighting method of the lighting module 3 includes optically focused
Illumination and floodlighting.
The drive module 1 includes: optically focused driving unit 11, floodlight driving unit 12, warning lamp driving unit 13, first
Power supply unit 14, the second power supply unit 15 and third power supply unit 16；First power supply unit 14, for being driven to the optically focused
Moving cell 11 and the floodlight driving unit 12 power supply；Second power supply unit 15 is used for the warning lamp driving unit
13 and the control module 2 power；16 circumscribed USB of third power supply unit (Universal Serial Bus, the general serial
Bus) socket 6.
In drive module 1, the power supply unit containing there are three, to meet the electricity of difference required for the different function of disparate modules
Numerical value and current values are pressed, specifically:
First power supply unit 14, for powering to the optically focused driving unit 11 and the floodlight driving unit 12；
Second power supply unit 15, for powering to the warning lamp driving unit 13 and the control module 2；
The external general-purpose serial bus USB socket 6 of third power supply unit 16.
Wherein, the first power supply unit 14 includes first singlechip and lithium battery group, and the lithium battery group passes through described first
Single-chip microcontroller is powered to the optically focused driving unit and the floodlight driving unit, and the first singlechip passes through the lithium electricity
PWM (Pulse Width Modulation, pulsewidth modulation) signal of pond group output, adjusts the optically focused driving unit and described
The driving signal of floodlight driving unit.
In the present embodiment, lithium battery group can power to optically focused driving unit 11, and can give floodlight driving unit
12 power supply, and the optically focused driving unit 11 and floodlight driving unit 12 all have PWM dimming function, first singlechip according to
The pulse-width modulation PWM signal of the lithium battery group output, is given to driving signal with specific reference to duty size ratio and is adjusted, make to shine
Bright module 3 can be realized non-pole light regulating.
It is preferred that above-mentioned lithium battery group is using 7 strings 5 and mode, so that discharge voltage is in 19V-30V, to ensure lamp
Tool can start in low temperature environment, by the starting voltage pull-down of optically focused driving unit 11 to 16V；Dimmer voltage is within 5V；6
Lamp bead；Lamp bead operating voltage is calculated by every 2.7V-3.3V；Therefore output voltage is 16.2V-19.8V.First power supply unit
14 further include lithium battery charger, can be charged for lithium battery group, and replacement battery is avoided.
The circuit structure of second power supply unit 15 is as shown in Figure 3: the second power supply unit 15 include the first built-in power V1 and
The input terminal of voltage conversion chip U1, the voltage conversion chip U1 include the first filter capacitor C1, first filter capacitor
C1 connects the control module 2 by the first connector group 4；The output end of the voltage conversion chip U1 includes the second filter
Wave capacitor C2, the second filter capacitor C2 connect the lighting module 3 by the second connector group 5.
In the present embodiment, after the voltage of the first built-in power output is handled by the first filter capacitor, it is input to voltage
The input terminal of conversion chip after voltage conversion chip output voltage, is output to the second company after handling by the second filter capacitor again
Device group 5 is connect, thus by voltage output into lighting module 3；Meanwhile first filter capacitor pass through the first connector group 4 and control
Module 2 connects, and control module 2 is enabled to read battery voltage information and charging voltage signal.
It is preferred that above-mentioned voltage conversion chip can use 34063 chips.
Third power supply unit 16 includes the second built-in power V2, second singlechip U2, second singlechip wake-up circuit 41；
Fig. 4 shows the circuit structure of the second part built-in power V2 in third power supply unit 16.Second built-in power V2
Output end has fuse, is passing through 42 output voltage of single-chip microcontroller external circuit to second singlechip U2, second singlechip U2's is defeated
Outlet has reduction voltage circuit 43, the input terminal of 43 output voltage of reduction voltage circuit to second singlechip wake-up circuit 41.
Fig. 5 shows the circuit structure of 41 part of second singlechip wake-up circuit in third power supply unit 16, and described second
Single-chip microcontroller wake-up circuit 41 includes voltage amplifier circuit 411 (not marking in figure)；The voltage amplifier circuit 411, in institute
When stating USB socket access device, the output end output voltage signal of the second singlechip wake-up circuit 41 is controlled, and amplifies institute
Voltage signal is stated, so that the second singlechip U2 connects the second built-in power V2 and powers to the USB socket.Specifically, electric
It presses amplifying circuit 411 that there is port PA1 and PA2, can connect the output end of the second above-mentioned built-in power V2；
The course of work of foregoing circuit are as follows: when accessing electrical appliance in USB socket, i.e. the pin of socket USB+ and USB- accesses
After electrical equipment, forming circuit generates a faint voltage, the i.e. output of second singlechip wake-up circuit 41 between USB pin
End obtains a faint voltage signal, this voltage signal is using the voltage amplifier circuit in second singlechip wake-up circuit 41
411 export voltage amplification to the port PA1 and PA2 of voltage amplifier circuit, so that second singlechip U2 connects the second in-built electrical
It powers after the V2 of source to USB socket.
In the present embodiment, for the discharge voltage of the second built-in power V2 in 19V-30V, USB socket is mainly used for output electricity
It presses to mobile phone, hand-held lamps and lanterns emergent charging, such product charge voltage range is in 5V or so, for the purpose of Emergency use, function
Rate 5W can meet requirement.Therefore design output voltage is in 5V/1A；But actually chip input driving voltage is up to
36V, up to 3mA, loss is too big for power consumption, therefore second singlechip is added and does arousal function, and second singlechip is in the standby state
Power consumption only uA rank.
The control module 2 includes main control chip 21, push-button unit 22, display unit 23 and pressure unit 24；It is described to press
Key unit 22 is connect by the pressure unit 24 with the main control chip 21；The display unit 23 connects with main control chip 21
It connects；The main control chip 21 is connect by the first connector group 4 with the drive module 1.
The main control chip 21 uses high performance processor, it is desirable that have AD mouthful, can read battery voltage signal with
Charging voltage signal；Dim signal is divided into 100 parts, 8 bit processors i.e. 28=256, processor digit selects 8/16
Meet；But because design need to have clocking capability, longest timing reaches 8h or more.It is calculated, is had using 1S with single-chip microcontroller timing within 8 hours
Standby capacity is up to 8 × 60 × 60=28800；Eight bit register has been unsatisfactory for demand, comprehensively consider processor need to select 16 or with
On.Simultaneous processor has multiport, and AD resets, and data transmission, screen data etc., port number is 20.
Because monolith control panel is needed using waterproof construction, push-button unit 22 is tired according to traditional touch switch waterproof
Difficulty uses the special big price of Waterproof push-button volume.It is preferred that being placed on control panel shell, pressing using film key
Key service life is greater than 5000 times.
The display unit 23 can show operating mode picture: gather general, optically focused, floodlight, electric discharge remaining time, battery electricity
Amount display and charging display, non-pole light regulating diagram etc..
Control module 2 mainly uses 3.3V power supply control plate, therefore is converted to 5V input voltage using voltage dropping power supply 24
3.3V supply voltage, it is preferable that LDO (low dropout regulator, low pressure difference linear voltage regulator) scheme is used,
Compared to the pressure drop scenario of Traditional DC output direct current output, the cost of LDO linear voltage regulator is low, and low noise, quiescent current is small,
Outward element is few, usually only needs one or two of shunt capacitance.
The lighting module 3 includes LED optically focused lamp group 31, LED floodlight group 32 and warning lamp group 33；The LED optically focused
Lamp group 31, LED floodlight group 32 and warning lamp group 33 are connect by the second connector group 5 with the drive module 1.
The LED optically focused lamp group 31, the effect of LED floodlight group 32 are identical with embodiment one, for realizing floodlight photograph
Bright and spotlighting.And warn the light source of lamp group 33 using circular rings around reddish yellow dichromatism lamp bead equidistant interval layout, for showing
The working condition of present lighting control system.For example, warning lamp group 33 show feux rouges be always on, indicate lighting control system according to
It is bright；Warning lamp group 33 shows feux rouges and flashes, and indicates that the spotlighting driving 11 and floodlighting in drive module 1 drive 12
Power supply unit not enough power supply etc..
In the present embodiment, by installing the driving method of two kinds of light, two kinds for realizing lighting module in drive module
Light illumination mode, while non-pole light regulating is realized by pwm signal, so that lighting control system meets the requirement of several scenes.
And multiple power supply units are provided in drive module, meet the supply voltage requirement of disparate modules, while realizing different functions,
The practicability for increasing lighting control system is effectively reduced the electric energy loss of system, extends the use of lighting control system
Service life.
Embodiment three
Third embodiment of the invention additionally provides a kind of lamps and lanterns, and the lamps and lanterns include that any one of above-described embodiment such as shines
Bright control system.
In the above-described embodiments, it all emphasizes particularly on different fields to the description of each embodiment, is not described in detail or remembers in some embodiment
The part of load may refer to the associated description of other embodiments.
Those of ordinary skill in the art may be aware that list described in conjunction with the examples disclosed in the embodiments of the present disclosure
Member and algorithm steps can be realized with the combination of electronic hardware or computer software and electronic hardware.These functions are actually
It is implemented in hardware or software, the specific application and design constraint depending on technical solution.Professional technician
Each specific application can be used different methods to achieve the described function, but this realization is it is not considered that exceed
The scope of the present invention.
In embodiment provided by the present invention, it should be understood that disclosed device/terminal device and method, it can be with
It realizes by another way.For example, device described above/terminal device embodiment is only schematical, for example, institute
The division of module or unit is stated, only a kind of logical function partition, there may be another division manner in actual implementation, such as
Multiple units or components can be combined or can be integrated into another system, or some features can be ignored or not executed.Separately
A bit, shown or discussed mutual coupling or direct-coupling or communication connection can be through some interfaces, device
Or the INDIRECT COUPLING or communication connection of unit, it can be electrical property, mechanical or other forms.
It, can also be in addition, the functional units in various embodiments of the present invention may be integrated into one processing unit
It is that each unit physically exists alone, can also be integrated in one unit with two or more units.Above-mentioned integrated list
Member both can take the form of hardware realization, can also realize in the form of software functional units.
If the integrated module/unit be realized in the form of SFU software functional unit and as independent product sale or
In use, can store in a computer readable storage medium.Based on this understanding, the present invention realizes above-mentioned implementation
All or part of the process in example method, can also instruct relevant hardware to complete, the meter by computer program
Calculation machine program can be stored in a computer readable storage medium, the computer program when being executed by processor, it can be achieved that on
The step of stating each embodiment of the method.Wherein, the computer program includes computer program code, the computer program generation
Code can be source code form, object identification code form, executable file or certain intermediate forms etc..The computer-readable medium
It may include: any entity or device, recording medium, USB flash disk, mobile hard disk, magnetic that can carry the computer program code
Dish, CD, computer storage, read-only memory (ROM, Read-Only Memory), random access memory (RAM,
Random Access Memory), electric carrier signal, telecommunication signal and software distribution medium etc..It should be noted that described
The content that computer-readable medium includes can carry out increasing appropriate according to the requirement made laws in jurisdiction with patent practice
Subtract, such as does not include electric carrier signal and electricity according to legislation and patent practice, computer-readable medium in certain jurisdictions
Believe signal.
Embodiment described above is merely illustrative of the technical solution of the present invention, rather than its limitations；Although referring to aforementioned reality
Applying example, invention is explained in detail, those skilled in the art should understand that: it still can be to aforementioned each
Technical solution documented by embodiment is modified or equivalent replacement of some of the technical features；And these are modified
Or replacement, the spirit and scope for technical solution of various embodiments of the present invention that it does not separate the essence of the corresponding technical solution should all
It is included within protection scope of the present invention.
Claims (10)
1. a kind of lighting control system characterized by comprising drive module, control module, lighting module, the first connector
Group and the second connector group；
The drive module is connect with the control module by the first connector group；
The drive module is connect with the lighting module by the second connector group；
The drive module selects the lighting method of the lighting module according to the instruction of the control module；
The lighting method of the lighting module includes spotlighting and floodlighting.
2. lighting control system as described in claim 1, which is characterized in that the drive module include: optically focused driving unit,
Floodlight driving unit, warning lamp driving unit, the first power supply unit, the second power supply unit and third power supply unit；
First power supply unit, for powering to the optically focused driving unit and the floodlight driving unit；
Second power supply unit, for powering to the warning lamp driving unit and the control module；
The external general-purpose serial bus USB socket of third power supply unit.
3. lighting control system as claimed in claim 2, which is characterized in that first power supply unit includes first singlechip
And lithium battery group, the lithium battery group is by the first singlechip to the optically focused driving unit and the floodlight driving unit
Power supply.
4. lighting control system as claimed in claim 3, which is characterized in that the first singlechip is used for through the lithium electricity
The pulse-width modulation PWM signal of pond group output, adjusts the driving signal of the optically focused driving unit and the floodlight driving unit.
5. lighting control system as claimed in claim 3, which is characterized in that first power supply unit further includes that lithium battery fills
Electric appliance.
6. lighting control system as claimed in claim 2, which is characterized in that second power supply unit includes the first in-built electrical
Source and voltage conversion chip, the input terminal of the voltage conversion chip include the first filter capacitor, and first filter capacitor is logical
It crosses the first connector group and connects the control module；
The output end of the voltage conversion chip includes the second filter capacitor, and second filter capacitor is connected by described second
Device group connects the lighting module.
7. lighting control system as claimed in claim 2, which is characterized in that the third power supply unit includes the second in-built electrical
Source, second singlechip, second singlechip wake-up circuit；
The second singlechip wake-up circuit includes voltage amplifier circuit；
The voltage amplifier circuit, for controlling the second singlechip wake-up circuit in the USB socket access device
Output end output voltage signal, and amplify the voltage signal, so that the second singlechip connects built-in power to the USB
Socket power supply.
8. lighting control system as described in claim 1, which is characterized in that the control module includes main control chip, key
Unit, display unit and pressure unit；
The push-button unit is connected with the main control chip by the pressure unit；The display unit and the main control chip
Connection；
The main control chip is connect by the first connector group with the drive module.
9. lighting control system as described in claim 1, which is characterized in that the lighting module include LED optically focused lamp group,
LED floodlight group and warning lamp group；
The LED optically focused lamp group, LED floodlight group and warning lamp group are connected by the second connector group and the drive module
It connects.
10. a kind of lamps and lanterns, which is characterized in that the lamps and lanterns include the Lighting control system of any one as described in claim 1 to 9
System.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810072015.7A CN110087358B (en) | 2018-01-25 | 2018-01-25 | Illumination control system and lamp |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810072015.7A CN110087358B (en) | 2018-01-25 | 2018-01-25 | Illumination control system and lamp |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN110087358A true CN110087358A (en) | 2019-08-02 |
| CN110087358B CN110087358B (en) | 2021-11-02 |
Family
ID=67411930
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201810072015.7A Active CN110087358B (en) | 2018-01-25 | 2018-01-25 | Illumination control system and lamp |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN110087358B (en) |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101702859A (en) * | 2009-11-12 | 2010-05-05 | 北京星光影视设备科技股份有限公司 | Lamp cup type cold light lamp control system capable of adjusting light one by one |
| CN201521832U (en) * | 2009-09-25 | 2010-07-07 | 镇江市旋丽电器有限公司 | Art space light illumination design lighting-effect device |
| CN202674908U (en) * | 2012-05-25 | 2013-01-16 | 李文杰 | Lamp with multi-action switch |
| CN102980051A (en) * | 2011-09-06 | 2013-03-20 | 泰金宝电通股份有限公司 | Light-emitting device |
| CN205208408U (en) * | 2015-11-30 | 2016-05-04 | 深圳市尚为照明有限公司 | Portable multipurpose solar lamp |
-
2018
- 2018-01-25 CN CN201810072015.7A patent/CN110087358B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201521832U (en) * | 2009-09-25 | 2010-07-07 | 镇江市旋丽电器有限公司 | Art space light illumination design lighting-effect device |
| CN101702859A (en) * | 2009-11-12 | 2010-05-05 | 北京星光影视设备科技股份有限公司 | Lamp cup type cold light lamp control system capable of adjusting light one by one |
| CN102980051A (en) * | 2011-09-06 | 2013-03-20 | 泰金宝电通股份有限公司 | Light-emitting device |
| CN202674908U (en) * | 2012-05-25 | 2013-01-16 | 李文杰 | Lamp with multi-action switch |
| CN205208408U (en) * | 2015-11-30 | 2016-05-04 | 深圳市尚为照明有限公司 | Portable multipurpose solar lamp |
Also Published As
| Publication number | Publication date |
|---|---|
| CN110087358B (en) | 2021-11-02 |
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Effective date of registration: 20210918 Address after: 518000 room 1106, 11th floor, building B, haiyangwang science and technology building, Gaoxin West Road, Dongzhou community, Guangming Street, Guangming District, Shenzhen City, Guangdong Province Applicant after: Shenzhen haiyangwang railway Lighting Technology Co.,Ltd. Applicant after: SHEN ZHEN OCEAN'S KING LIGHTING ENGINEERING Co.,Ltd. Applicant after: OCEAN'S KING LIGHTING SCIENCE & TECHNOLOGY Co.,Ltd. Applicant after: OCEAN'S KING (DONGGUAN) LIGHTING TECHNOLOGY Co.,Ltd. Address before: 518000 north side of the second floor of the main plant of Huaye company, No.84 Dongbin Road, Nanshan District, Shenzhen City, Guangdong Province Applicant before: SHEN ZHEN OCEAN'S KING LIGHTING ENGINEERING Co.,Ltd. Applicant before: OCEAN'S KING LIGHTING SCIENCE & TECHNOLOGY Co.,Ltd. Applicant before: OCEAN'S KING (DONGGUAN) LIGHTING TECHNOLOGY Co.,Ltd. |
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