CN207638940U - LED light string control system - Google Patents
LED light string control system Download PDFInfo
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- CN207638940U CN207638940U CN201721741584.3U CN201721741584U CN207638940U CN 207638940 U CN207638940 U CN 207638940U CN 201721741584 U CN201721741584 U CN 201721741584U CN 207638940 U CN207638940 U CN 207638940U
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- led light
- polar voltages
- polarity
- light string
- control system
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B20/00—Energy efficient lighting technologies, e.g. halogen lamps or gas discharge lamps
- Y02B20/40—Control techniques providing energy savings, e.g. smart controller or presence detection
Abstract
The utility model discloses a kind of LED light string control systems, including Power Management Unit, electrodeless changeable output unit and LED light serializer circuit, electrodeless changeable output unit to be electrically connected respectively with Power Management Unit and LED light serializer circuit；Power Management Unit is used to provide DC power supply to control system；Electrodeless changeable output unit is used for chronologically to the polar voltages of LED light string circuit output assigned frequency, wherein, there are two polar voltages output ports for the output end setting of electrodeless changeable output unit, and there are two polar voltages input ports for the setting of LED light string circuit input end.Implement the utility model, the traditional multiple-way system LED light serializer circuit of LED light string positive-negative connected circuitry instead simplifies production process, production cost is greatly saved, simple in structure, convenient for safeguarding.
Description
Technical field
The utility model is related to LED light control technology fields, and system is controlled more specifically to a kind of LED light string
System
Background technology
LED light source has the characteristics that light efficiency is high, small, spectrum is narrow, long lifespan, and using these characteristics, we can create
Produce more high-quality and intelligent lighting environment.Studies have pointed out that the light source color temperature of lighting environment adjusts human physiological functions
It plays a role, and the colour temperature for the sunlight that the mankind adapt to the most is also as the time is continually changing among one day；
Meanwhile in some special occasions, such as museum, hospital and commodity exhibition hall, people are also required to one can be according to practical need
Seek the lighting control system being adjusted to light source color temperature.
Include mainly positive output line and several negative output lines, every cathode in existing LED circuit control technology
Output line connects the negative pole end of one group of LED light group, and the positive terminal of multigroup LED light group is connected to positive output line altogether.This LED light string
The major defect of the mode of connection is that line is more, complicated, of high cost.
Patent [CN201610166211] discloses a kind of LED light string of positive-negative connected formula, including controller, LED module.Institute
It includes at least 2 groups of LED light groups to state LED module, further includes main line one, main line two, at least 2 groups of LED light groups are series at main line
One, between main line two, every group of LED light group includes the LED lamp bead of several forward and reverse alternately parallel connections.As LED light string has 100
LED lamp bead, you can use the positive inverse parallel of every 10 LED lamp beads for one group, 10 groups of connection types being in series.This connection type
Although in the circuit connection of LED light string, simplified, it is still relative complex, it can be seen that by its patent text
It will again connect after a certain number of LED light parallel connections, cause its control mode still complicated, and at least need three lines
It is connected in series with each parallel connection LED lamp group, cost is also higher.
Invention content
The technical problem to be solved by the present invention is to for existing LED light string circuit structure complexity, safeguard, production
The higher problem of cost proposes a kind of LED light string control system, by the way that electrodeless changeable output unit is arranged, refers to according to sequential
In the voltage to LED light serializer circuit for enabling output particular polarity, adjacent LED light polarity on the contrary, constitute in turn in LED light serializer circuit
Positive-negative connected circuit by obtaining the voltage of particular polarity, and then lights corresponding polar LED light.The LED light string of the utility model
The traditional multiple-way system LED light serializer circuit of positive-negative connected circuitry instead, simplifies production process, production cost is greatly saved.And
And it is simple in structure, convenient for safeguarding.
In a first aspect, a kind of LED light string control system, including Power Management Unit are proposed, wherein further including electrodeless
Changeable output unit and LED light serializer circuit, the electrodeless changeable output unit are electric with Power Management Unit and LED light string respectively
Road is electrically connected,
The Power Management Unit is used to provide direct current to the LED light string control system；It is described electrodeless changeable
Output unit is used for chronologically to the polar voltages of the LED light string circuit output assigned frequency, wherein described electrodeless changeable defeated
The output end for going out unit is arranged there are two polar voltages output port, polarity that there are two the LED light string circuit input end settings
Control source port, the polarity include positive and negative two polarity.
In conjunction with the utility model in a first aspect, two polar voltages output ends described in the first possible realization method
Mouth is respectively the first polar voltages output port and the second polar voltages output port, described two polar voltages input ports point
Not Wei the first polar voltages input port and the second polar voltages input port, the first polar voltages output port and second
Polar voltages output port is electrically connected with the first polar voltages input port and the second polar voltages input port.
In conjunction with the first possible realization method of the first aspect of the utility model, in second of possible realization method
The first polar voltages input port is arranged on the first polarity connecting line of the LED light serializer circuit, second polarity
Control source port is arranged on the second polarity connecting line of the LED light serializer circuit, the first polarity connecting line with it is described
Second polarity connecting line is electrically connected, LED light be connected in parallel the first polarity connecting line and the second polarity connecting line it
Between.
In conjunction with second of possible realization method of the first aspect of the utility model, in the third possible realization method
The quantity of the LED light is more than 2.
In conjunction with the third possible realization method of the first aspect of the utility model, in the 4th kind of possible realization method
The adjacent LED light polarity of any two is opposite.
In conjunction with the utility model in a first aspect, in the 5th kind of possible realization method, the electrodeless changeable output unit
Including instruction input module, MCU and polar voltages output port module, the MCU respectively with described instruction input module with
And polar voltages output port module electrical connection；
For described instruction input module for exporting control, timing instructions to the MCU, the MCU control polarities voltage is defeated
Exit port module exports the changed polarity voltage of assigned frequency to the first, second polar voltages output port.
In conjunction with the utility model in a first aspect, electrodeless changeable output unit described in the 6th kind of possible realization method is
The electrodeless changeable output unit of DC power supply, the electrodeless changeable output unit of battery case series or the electrodeless changeable output of solar energy series are single
First is any.
By implement the utility model proposes a kind of LED light string control system, pass through and electrodeless changeable output be set
Unit, according to timing instructions export particular polarity voltage to LED light serializer circuit in, adjacent LED light pole in LED light serializer circuit
Property on the contrary, constitute positive-negative connected circuit in turn, by obtaining the voltage of particular polarity, and then light corresponding polar LED light.This reality
With the traditional multiple-way system LED light serializer circuit of novel LED light string positive-negative connected circuitry instead, production process is simplified, is saved significantly
About production cost.And it is simple in structure, convenient for safeguarding.When the polarity frequency sweep of above-mentioned timing variations is more than 24HZ, it is equivalent to
All polar LED light are lighted simultaneously, and then show its decorative effect.
Description of the drawings
It is required in being described below to embodiment in order to illustrate more clearly of the technical scheme in the embodiment of the utility model
Attached drawing to be used is briefly described, it should be apparent that, the accompanying drawings in the following description is only some realities of the utility model
Example is applied, it for those of ordinary skill in the art, without creative efforts, can also be according to these attached drawings
Obtain other attached drawings.
Fig. 1 is that a kind of logic of LED light string control system embodiment provided by the utility model forms connection signal
Figure；
Fig. 2 is that a kind of port of LED light string control system provided by the utility model connects embodiment schematic diagram；
Fig. 3 is that the electrodeless changeable output unit in a kind of LED light string control system provided by the utility model is implemented
The logical connection schematic diagram of example；
Fig. 4 is that the DC power supply power supply in a kind of LED light string control system provided by the utility model is electrodeless changeable
The port connection diagram of output unit embodiment；
Fig. 5 is that the battery case series power in a kind of LED light string control system provided by the utility model is electrodeless more
Become the port connection diagram of output unit embodiment；
Fig. 6 is that the solar energy series power supply in a kind of LED light string control system provided by the utility model is electrodeless more
Become the port connection diagram of output unit embodiment；
Fig. 7 is the first implementation of the LED light serializer circuit in a kind of LED light string control system provided by the utility model
The port connection diagram of example；
Fig. 8 is the second implementation of the LED light serializer circuit in a kind of LED light string control system provided by the utility model
The port connection diagram of example；
Fig. 9 is that the third of the LED light serializer circuit in a kind of LED light string control system provided by the utility model is implemented
The port connection diagram of example；
Figure 10 is a kind of LED light string control method embodiment step flow diagram provided by the utility model；
The sub-step flow signal that Figure 11 is step S2 in a kind of LED light string control method provided by the utility model
Figure；
Detailed description of main elements：10 --- Power Management Unit 10,20 --- electrodeless changeable output unit, 21 --- instruction it is defeated
Enter --- MCU, 23 --- polar voltages output port module, the ends a --- the first polar voltages output port, the b of module, 22
Hold --- the second polar voltages output port, 30 --- LED light serializer circuit, the ends A --- the first polar voltages input port, B
End --- the second polar voltages input port.
Specific implementation mode
In order to make the purpose of the utility model, technical solutions and advantages more clearly understood, below in conjunction with attached drawing and implementation
Example, the present invention will be further described in detail.It should be appreciated that specific embodiment described herein is only explaining this
Utility model is not used to limit the utility model.
System embodiment
Referring to FIG. 1, Fig. 1 is a kind of logical groups of LED light string control system embodiment provided by the utility model
At connection diagram.For existing LED light string circuit structure complexity, safeguard, the higher problem of production cost proposes that one kind is novel
LED light string control system, system include Power Management Unit 10, electrodeless changeable output unit 20 and LED light serializer circuit, electrodeless more
Become output unit 20 to be electrically connected with Power Management Unit 10 and LED light serializer circuit respectively, wherein electrodeless changeable output unit 20
Output end setting there are two polar voltages output port, there are two polar voltages input terminals for the setting of LED light string circuit input end
Mouthful, polarity is positive and negative two polarity.LED light string positive-negative connected circuit in the utility model limits control circuit, structure using 2 lines
Simply, it is convenient for safeguarding, instead of traditional multiple-way system LED light serializer circuit, simplifies production process, be greatly saved and be produced into
This.
Specifically, Power Management Unit 10 is used to provide direct current to LED light string control system；Electrodeless changeable output
Unit 20 is for chronologically to the polar voltages of LED light string circuit output assigned frequency, above-mentioned defined frequency to be less than 24HZ
When, eye recognition goes out the fade effect of LED light, when more than or equal to 24HZ, exceeds the identification reaction range of human eye, is equivalent to complete
Portion's lightening LED lamp changes frequency sweep to reach specific decorative effect as needed in practice.
Those skilled in the art know that electrodeless 20 pole of changeable output unit in the utility model is for chronologically output rule
Determine the polar voltages of frequency, main function is so that treated DC voltage generates change in polarity, with LED light string electricity
The voltage of Lu Lian, change in polarity light the LED light in foregoing circuit, therefore, any to be equal to this unit progress identical function
Replacement belongs to the scope of protection of the utility model.
Referring to FIG. 2, the port connection that Fig. 2 is a kind of LED light string control system provided by the utility model is implemented
It illustrates and is intended to；Polar voltages output port there are two being arranged in the output end of electrodeless changeable output unit 20, specifically, two poles
Property voltage output port is respectively the first polar voltages output port and the second polar voltages output port, if above-mentioned polar voltages
Output port is respectively the ends a and the ends b, and processed polar voltages are passed through in the ends a and the ends b for exporting, and above-mentioned processing can be stated
It, in order to meet the needs to brightness, needs to improve for example, for the lamp string circuit containing multiple LED light for the processing to voltage
Polarity input voltage, above-mentioned two electrical connection corresponding with two input ports of LED light serializer circuit.
Polar voltages input port there are two being arranged in the input terminal of LED light serializer circuit, specifically, two polar voltages are defeated
Inbound port is respectively the first polar voltages input port and the second polar voltages input port, if above-mentioned polar voltages input port
Respectively side a and b, the control circuit where side a and b are respectively A lines, B lines, above-mentioned A lines, the connection of B lines, the art
Personnel know that above-mentioned A lines, B lines connection one semi-enclosed DC circuit of composition, side a and b is the both ends of opposed polarity.The ends a
It is connected respectively in side a and b with the ends b.
Further, first polarity connecting line of the first polar voltages input port setting (ends a) in LED light serializer circuit
On, the second polar voltages input port (ends b) is arranged on the second polarity connecting line of LED light serializer circuit, the connection of the first polarity
Line is electrically connected with the second polarity connecting line, and LED light is connected in parallel between the first polarity connecting line and the second polarity connecting line.And
The quantity of the LED light of connection is more than 2, and the adjacent LED light polarity of any two is on the contrary, opposite polarity LED light is alternately connected in parallel on
To reach the decorative effect of variation in circuit, those skilled in the art know, the positive revertive control in the utility model can be stated
For：
The adjacent LED light polarity of any two is on the contrary, referring to FIG. 7, Fig. 7 is that one kind provided by the utility model is novel
The port connection diagram of the first embodiment of LED light serializer circuit in LED light string control system.
Any one group of LED light polarity adjacent thereto is on the contrary, referring to FIG. 9, Fig. 9 is provided by the utility model a kind of new
The port connection diagram of the 3rd embodiment of LED light serializer circuit in type LED light string control system.
Two LED light group polarity of arbitrary neighborhood are on the contrary, referring to FIG. 8, Fig. 8 is that one kind provided by the utility model is novel
The port connection diagram of the second embodiment of LED light serializer circuit in LED light string control system.
It should be noted that the quantity of above-mentioned LED light group is identical or different, to any LED light group in the utility model
Quantity is not restricted.
Further, referring to FIG. 3, Fig. 3 is the nothing in a kind of LED light string control system provided by the utility model
The logical connection schematic diagram of extremely changeable 20 embodiment of output unit.
Electrodeless changeable output unit 20 includes instruction input module 21, MCU22 and polar voltages output port module 23,
MCU22 is electrically connected with instruction input module 21 and polar voltages output port module 23 respectively；Instruction input module 21 is used for
Output control, timing instructions to MCU22, power management module are used to handle 10 voltage of Power Management Unit of reception,
And receive MCU22 control command output assigned frequency changed polarity voltage to the first, second polar voltages output port.
The positive and negative connection of LED light group in the utility model can be used in the circuit that any DC power supply provides.It please refers to
Fig. 4-6, Fig. 4 are that the DC power supply power supply in a kind of LED light string control system provided by the utility model is electrodeless changeable defeated
Go out the port connection diagram of 20 embodiment of unit；Fig. 5 is in a kind of LED light string control system provided by the utility model
Electrodeless 20 embodiment of changeable output unit of battery case series power port connection diagram；Fig. 6 provides for the utility model
A kind of LED light string control system in solar energy series power electrodeless 20 embodiment of changeable output unit port connection
Schematic diagram, specifically, electrodeless changeable output unit 20 is the electrodeless changeable output unit 20 of DC power supply, battery case series is electrodeless more
Become any of output unit 20 or the electrodeless changeable output unit of solar energy series 20.
The utility model also provides a kind of LED light string control method, referring to FIG. 10, Figure 10 carries for the utility model
A kind of LED light string control method embodiment step flow diagram supplied, including：
S1, Power Management Unit 10 provide direct current to system.
The positive and negative connection of LED light group in the utility model can be used in the circuit that any DC power supply provides, specifically,
Electrodeless changeable output unit 20 be the electrodeless changeable output unit 20 of DC power supply, the battery case electrodeless changeable output unit 20 of series or
The electrodeless changeable output unit of solar energy series 20 it is any.
S2, electrodeless changeable output unit 20 chronologically export the polar voltages of assigned frequency.Step S2, please refers to Fig.1 1,
Figure 11 is the sub-step flow diagram of step S2 in a kind of LED light string control method provided by the utility model, including：
S21, instruction input module 21 are in advance by the polar voltages control instruction of assigned frequency to input MCU22.
S22, MCU22 control polarity voltage output port module 23 handles the supply voltage of input, obtains one group
The voltage of specified polarity, and it is respectively transmitted to two polar voltages output ports of setting.
Those skilled in the art know that the 20 extremely changeable output unit of electrodeless changeable output unit in the utility model is used for
The polar voltages of assigned frequency are chronologically exported, main function is so that treated DC voltage generates polarity change
Change, connect with LED light serializer circuit, the voltage of change in polarity lights the LED light in foregoing circuit, any to carry out identical work(to this unit
The equivalent replacement of energy belongs to the scope of protection of the utility model.
Polar voltages output port there are two being arranged in the output end of electrodeless changeable output unit 20, specifically, two poles
Property voltage output port is respectively the first polar voltages output port and the second polar voltages output port, if above-mentioned polar voltages
Output port is respectively the ends a and the ends b, and processed polar voltages are passed through in the ends a and the ends b for exporting, and above-mentioned processing can be stated
For the processing to voltage, for example, the lamp string circuit containing multiple LED light needs to carry to meet the needs to brightness at one
Highly polar input voltage, above-mentioned two electrical connection corresponding with two input ports of LED light serializer circuit.
Input port port there are two being arranged in the input terminal of LED light serializer circuit, specifically, two polar voltages input terminals
Mouth is respectively the first polar voltages input port and the second polar voltages input port, if above-mentioned polar voltages input port is distinguished
For side a and b, the control circuit where side a and b is respectively A lines, B lines, above-mentioned A lines, the connection of B lines, those skilled in the art
Know, above-mentioned A lines, B lines connection one semi-enclosed DC circuit of composition, side a and b is the both ends of opposed polarity.The ends a and b
End is connected respectively in side a and b.
Further, first polarity connecting line of the first polar voltages input port setting (ends a) in LED light serializer circuit
On, the second polar voltages input port (ends b) is arranged on the second polarity connecting line of LED light serializer circuit, the connection of the first polarity
Line is electrically connected with the second polarity connecting line, and LED light is connected in parallel between the first polarity connecting line and the second polarity connecting line.And
The quantity of the LED light of connection is more than 2, and the adjacent LED light polarity of any two is on the contrary, opposite polarity LED light is alternately connected in parallel on
To reach the decorative effect of variation in circuit, the positive revertive control in the utility model can be expressed as, the adjacent LED of any two
Lamp polarity is opposite, any one group of LED light polarity adjacent thereto is opposite or two LED light group polarity of arbitrary neighborhood are opposite.
It should be noted that the quantity of above-mentioned LED light group is identical or different, to any LED light group in the utility model
Quantity is not restricted.
Further, electrodeless changeable output unit 20 includes instruction input module 21, MCU22 and polar voltages output end
Mouth mold block 23, MCU22 are electrically connected with instruction input module 21 and polar voltages output port module 23 respectively；Instruction input mould
Block 21 for exporting control, timing instructions to MCU22, power management module for 10 voltage of Power Management Unit of reception into
Row processing, and the changed polarity voltage for receiving the control command output assigned frequency of MCU22 is exported to the first, second polar voltages
Port.
S3, according to polar voltages, corresponding polar LED light in lightening LED lamp serializer circuit；Wherein, electrodeless changeable output is single
There are two polar voltages output ports for the output end setting of member 20, and there are two polar voltages are defeated for the setting of LED light string circuit input end
Inbound port, polarity are positive and negative two polarity.
By implement the utility model proposes a kind of LED light string control system, pass through and electrodeless changeable output be set
Unit 20, according to timing instructions export particular polarity voltage to LED light serializer circuit in, adjacent LED light in LED light serializer circuit
Polarity by obtaining the voltage of particular polarity, and then lights corresponding polar LED light on the contrary, constitute positive-negative connected circuit in turn.This
The traditional multiple-way system LED light serializer circuit of the LED light string positive-negative connected circuitry instead of utility model, simplifies production process, significantly
Production cost is saved.And it is simple in structure, convenient for safeguarding.When the polarity frequency sweep of above-mentioned timing variations is more than 24HZ, quite
All polar LED light are lighted in simultaneously, and then show its decorative effect.
The embodiments of the present invention are described above in conjunction with attached drawing, but the utility model is not limited to
The specific implementation mode stated, the above mentioned embodiment is only schematical, rather than restrictive, this field it is common
Technical staff is not departing from the utility model aims and scope of the claimed protection situation under the enlightenment of the utility model
Under, many forms can be also made, these are belonged within the protection of the utility model.
Claims (7)
1. a kind of LED light string control system, including Power Management Unit, which is characterized in that further include electrodeless changeable output
Unit and LED light serializer circuit, the electrodeless changeable output unit are electrically connected with Power Management Unit and LED light serializer circuit respectively
It connects,
The Power Management Unit is used to provide direct current to the control system；The electrodeless changeable output unit is on time
Polar voltages of the sequence to the LED light string circuit output assigned frequency, wherein the output end of the electrodeless changeable output unit is set
Polar voltages output port there are two setting, there are two polar voltages input ports for the LED light string circuit input end setting, described
Polarity includes positive and negative two polarity.
2. LED light string control system as described in claim 1, which is characterized in that described two polar voltages output ends
Mouth is respectively the first polar voltages output port and the second polar voltages output port, described two polar voltages input ports point
Not Wei the first polar voltages input port and the second polar voltages input port, the first polar voltages output port and second
Polar voltages output port is electrically connected with the first polar voltages input port and the second polar voltages input port.
3. LED light string control system as claimed in claim 2, which is characterized in that the first polar voltages input terminal
Mouth is arranged on the first polarity connecting line of the LED light serializer circuit, and the second polar voltages input port is arranged described
On second polarity connecting line of LED light serializer circuit, the first polarity connecting line is electrically connected with the second polarity connecting line,
LED light is connected in parallel between the first polarity connecting line and the second polarity connecting line.
4. LED light string control system as claimed in claim 3, which is characterized in that the quantity of the LED light is more than 2.
5. LED light string control system as described in claim 1, which is characterized in that the adjacent LED light polarity of any two
On the contrary.
6. LED light string control system as described in claim 1, which is characterized in that the electrodeless changeable output unit packet
Include instruction input module, MCU and polar voltages output port module, the MCU respectively with described instruction input module and
Polar voltages output port module is electrically connected；
For described instruction input module for exporting control instruction, timing instructions to the MCU, the MCU control polarities voltage is defeated
Exit port module exports the changed polarity voltage of assigned frequency to the first, second polar voltages output port.
7. LED light string control system as described in claim 1, which is characterized in that the electrodeless changeable output unit is
The electrodeless changeable output unit of DC power supply, the electrodeless changeable output unit of battery case series or the electrodeless changeable output of solar energy series are single
First is any.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721741584.3U CN207638940U (en) | 2017-12-14 | 2017-12-14 | LED light string control system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721741584.3U CN207638940U (en) | 2017-12-14 | 2017-12-14 | LED light string control system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN207638940U true CN207638940U (en) | 2018-07-20 |
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ID=62863580
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|---|---|---|---|
| CN201721741584.3U Active CN207638940U (en) | 2017-12-14 | 2017-12-14 | LED light string control system |
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| CN (1) | CN207638940U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109963371A (en) * | 2017-12-14 | 2019-07-02 | 东莞市荣升电子实业有限公司 | LED light string control system and method |
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2017
- 2017-12-14 CN CN201721741584.3U patent/CN207638940U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109963371A (en) * | 2017-12-14 | 2019-07-02 | 东莞市荣升电子实业有限公司 | LED light string control system and method |
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Effective date of registration: 20210226 Address after: 167 Luhu East Road, Dali Management District, Qingxi Town, Dongguan City, Guangdong Province Patentee after: Xie Huarong Address before: No. 167, Luhu East Road, Dali Management District, Qingxi Town, Dongguan City, Guangdong Province, 523660 Patentee before: Dongguan Rongsheng Electronic Industrial Co.,Ltd. |