CN113898903A - LED street lamp and control method thereof - Google Patents

LED street lamp and control method thereof Download PDF

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Publication number
CN113898903A
CN113898903A CN202110980663.4A CN202110980663A CN113898903A CN 113898903 A CN113898903 A CN 113898903A CN 202110980663 A CN202110980663 A CN 202110980663A CN 113898903 A CN113898903 A CN 113898903A
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CN
China
Prior art keywords
lamp
led
circuit board
led street
lamp body
Prior art date
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Pending
Application number
CN202110980663.4A
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Chinese (zh)
Inventor
蒋夏静
楼鸿玮
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Migang New Materials Technology Shanghai Co ltd
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Migang New Materials Technology Shanghai Co ltd
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Publication of CN113898903A publication Critical patent/CN113898903A/en
Pending legal-status Critical Current

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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21S—NON-PORTABLE LIGHTING DEVICES; SYSTEMS THEREOF; VEHICLE LIGHTING DEVICES SPECIALLY ADAPTED FOR VEHICLE EXTERIORS
    • F21S8/00—Lighting devices intended for fixed installation
    • F21S8/08—Lighting devices intended for fixed installation with a standard
    • F21S8/085—Lighting devices intended for fixed installation with a standard of high-built type, e.g. street light
    • F21S8/086—Lighting devices intended for fixed installation with a standard of high-built type, e.g. street light with lighting device attached sideways of the standard, e.g. for roads and highways
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21V—FUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
    • F21V23/00—Arrangement of electric circuit elements in or on lighting devices
    • F21V23/003—Arrangement of electric circuit elements in or on lighting devices the elements being electronics drivers or controllers for operating the light source, e.g. for a LED array
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21V—FUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
    • F21V29/00—Protecting lighting devices from thermal damage; Cooling or heating arrangements specially adapted for lighting devices or systems
    • F21V29/50—Cooling arrangements
    • F21V29/60—Cooling arrangements characterised by the use of a forced flow of gas, e.g. air
    • F21V29/67—Cooling arrangements characterised by the use of a forced flow of gas, e.g. air characterised by the arrangement of fans
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21V—FUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
    • F21V29/00—Protecting lighting devices from thermal damage; Cooling or heating arrangements specially adapted for lighting devices or systems
    • F21V29/50—Cooling arrangements
    • F21V29/70—Cooling arrangements characterised by passive heat-dissipating elements, e.g. heat-sinks
    • F21V29/74—Cooling arrangements characterised by passive heat-dissipating elements, e.g. heat-sinks with fins or blades
    • F21V29/76—Cooling arrangements characterised by passive heat-dissipating elements, e.g. heat-sinks with fins or blades with essentially identical parallel planar fins or blades, e.g. with comb-like cross-section
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21W—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES F21K, F21L, F21S and F21V, RELATING TO USES OR APPLICATIONS OF LIGHTING DEVICES OR SYSTEMS
    • F21W2131/00—Use or application of lighting devices or systems not provided for in codes F21W2102/00-F21W2121/00
    • F21W2131/10—Outdoor lighting
    • F21W2131/103—Outdoor lighting of streets or roads
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21Y—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES F21K, F21L, F21S and F21V, RELATING TO THE FORM OR THE KIND OF THE LIGHT SOURCES OR OF THE COLOUR OF THE LIGHT EMITTED
    • F21Y2115/00—Light-generating elements of semiconductor light sources
    • F21Y2115/10—Light-emitting diodes [LED]

Abstract

The invention provides an LED street lamp and a control method thereof, wherein the LED street lamp comprises a lamp body and a driving power supply, wherein the lamp body comprises a circuit board, at least one LED chip and a plurality of lamp beads, the LED chip and the plurality of lamp beads are arranged on the circuit board, the plurality of lamp beads and the at least one LED chip are electrically connected through the circuit board, the circuit board of the lamp body is electrically connected with the driving power supply, the driving power supply outputs given current and voltage, and the LED chip is controlled to work below rated working current through the circuit board and the plurality of lamp beads so as to improve the lighting effect.

Description

LED street lamp and control method thereof
Technical Field
The invention relates to the technical field of lighting equipment, in particular to an LED street lamp and a control method thereof.
Background
An LED, a solid-state semiconductor device that converts electricity into light, has a p-n junction composed of a p-type semiconductor and an n-type semiconductor at its core. The LED is used as a semiconductor device, and the LED is distinguished from incandescent lamps and fluorescent lamps by the light emitting principle, so that the LED has the advantages of high light emitting efficiency, long service life, environmental protection and small volume. Although in recent years, due to the improvement of photoelectric conversion efficiency and light emission luminance, LEDs gradually penetrate into industries such as general lighting, automobile lighting, and the like. However, in view of the global street lamp lighting market, the traditional high-energy-consumption lighting products still occupy a large part of the market, which is unfavorable for the global situation development of increasingly tense energy sources, and if the traditional solid-state light source is replaced by the energy-saving LED products, a large amount of energy sources can be saved, the greenhouse effect caused by carbon dioxide, the acid rain caused by sulfur dioxide, the mercury pollution and the like can be reduced. Therefore, the promotion of the efficient, energy-saving, environment-friendly and long-life LED products is very urgent and necessary.
In addition, the prior art LED light source as a street lamp has at least one of the following technical problems; firstly, the high-energy consumption street lamp replaced by the LED street lamp in the prior art basically adopts an integrated structure of the LED lamp and a power supply, the service life of the LED can reach 10 ten thousand hours, but the LED driving power supply does not keep up with the actual service life of the current LED. In the actual use process, the failed LED lamp is caused by the failure of the LED driving with a high probability, which also brings great maintenance cost (including lifting cars, road control, etc.) to the later maintenance process of the LED street lamp. Secondly, the LED light source in the prior art has a problem of low electrical-to-optical conversion rate as a street lamp, but the current value of the LED light source is usually increased to increase the luminous flux of the LED light source, which has a negative effect of increased power consumption. Third, the LED chip of the prior art generates a large amount of heat during operation, and thus a large current affects the lifespan and thermal stability of the LED.
Disclosure of Invention
One of the main advantages of the present invention is to provide an LED street lamp and a control method thereof, wherein the LED street lamp includes a lamp body and a driving power supply, and the driving power supply controls the lamp body to operate in a high-voltage and low-current operating mode, which is beneficial to improving the light emitting efficiency of the LED street lamp.
Another advantage of the present invention is to provide an LED street lamp and a control method thereof, in which the driving power supply of the LED street lamp drives an LED chip based on a high-voltage and low-current manner, thereby preventing the chip from working under a high current condition, and improving the light-decay resistance and thermal stability of the LED.
Another advantage of the present invention is to provide an LED street lamp and a control method thereof, wherein the LED street lamp has a high luminous efficiency of a light source, a high luminous intensity of a lamp bead, and a high power density, and can effectively improve an energy utilization rate, achieve an energy saving and emission reduction effect, and improve the energy saving rate by more than 80% compared with a conventional high energy consumption street lamp.
Another advantage of the present invention is to provide an LED street lamp and a control method thereof, wherein the LED street lamp further includes a lamp housing with a heat dissipation function, and the lamp housing is disposed on the lamp housing, which is beneficial to solving the heat dissipation problem of 3 core links, i.e., a chip is connected to a lamp bead, a lamp bead is connected to a substrate, and a substrate is connected to a housing device, and can effectively prolong the life of an LED light source.
Another advantage of the present invention is to provide an LED street lamp and a control method thereof, wherein the lamp body of the LED street lamp is structurally separated from the driving power supply, which is beneficial to reduce the post-maintenance cost of the LED street lamp and is beneficial to popularization and application of the LED street lamp.
Another advantage of the present invention is to provide an LED street lamp and a control method thereof, wherein the LED street lamp only needs to replace a bulb during use, and does not need to replace an original lamp housing of the street lamp, thereby greatly reducing waste of unnecessary resources.
The invention aims to solve the technical problem of the prior art, and aims to provide a novel LED street lamp with high light efficiency and low energy consumption, which can save energy consumption.
The invention also aims to provide a control method of the novel LED street lamp with high light efficiency and low energy consumption, which can save energy consumption.
In order to achieve the first purpose, the invention provides a novel LED street lamp with high light efficiency and low energy consumption, which comprises an LED lamp body and an LED driving power supply which are designed in a split mode, wherein the LED lamp body comprises a shell made of high heat conduction materials, the plane part of the shell is provided with an LED lamp bead patch PCB board in a laminating mode, the top of the shell is provided with a radiating fin and a radiating fan, one end of the shell is provided with a convenient installation component, and the LED lamp bead patch PCB board and the radiating fan are connected with the LED driving power supply through wires.
In accordance with one aspect of the present invention, the foregoing and other objects and advantages are achieved by an LED street lamp comprising:
a lamp body; and
a drive power supply, wherein the lamp body includes a circuit board, set up in at least an LED chip and a plurality of lamp pearl of circuit board, wherein a plurality of lamp pearls with at least an LED chip passes through electrical connection is realized to the circuit board, wherein the lamp body the circuit board with drive power supply electrically connects, drive power supply output given current and voltage, through the circuit board with a plurality of lamp pearl control the LED chip is being less than below rated operating current work to improve the light efficiency.
According to an embodiment of the present invention, the total number of the plurality of lamp beads is set to S ═ m × n, the lamp beads are arranged in a m-string-n parallel manner, the driving power supply outputs a given current I and a given voltage V, and the photoelectric characteristics of the chip are as follows:
V＝V1+V2+…+Vm
I＝I1+I2+…In；
so that n is connected with the LED lamp bead (I)1,I2,…,In) The current value of (a) is controlled to be 69.5% or less of the rated operating current of the LED chip.
According to an embodiment of the present invention, the at least one LED chip comprises an SMD holder and at least one chip unit disposed on the SMD holder, wherein the chip unit is fixed to the circuit board by the SMD holder.
According to one embodiment of the invention, the chip units are integrated in the SMD holder in series or/and parallel.
According to one embodiment of the invention, the LED chip operating current is controlled to be below 25.5% of the rated current.
According to an embodiment of the invention, the driving power output voltage value is between 100-150V.
According to an embodiment of the present invention, the driving power source is disposed separately from the lamp body, so that the driving power source is mounted on a supporting rod of a street lamp post, and the lamp body is fixed to an extending rod of the street lamp post.
According to an embodiment of the present invention, the lamp further comprises a lamp housing, wherein the lamp body is fixed to the lamp housing, and heat generated during operation is transferred to the lamp housing, and dissipated outwards by the lamp housing.
According to an embodiment of the present invention, the lamp housing includes a support plate and at least one heat dissipation fin disposed on the support plate, wherein the support plate is of a flat plate structure, the lamp body is fixed to the support plate, and the support plate fixedly supports the lamp body, wherein heat generated by the operation of the lamp body is conducted to the support plate of the lamp housing, and the heat dissipation fin is integrally formed on one side of the support plate, and the heat dissipation area is increased by the heat dissipation fin.
According to an embodiment of the present invention, a plurality of flow guiding grooves are formed between the heat dissipating fins, wherein the flow guiding grooves are communicated with the external environment, and the flow guiding grooves between the heat dissipating fins are used for guiding the flowing direction of the airflow.
According to an embodiment of the present invention, the lamp further comprises a heat sink, wherein the heat sink is disposed on the lamp housing, and the heat sink dissipates heat to the lamp housing by active heat dissipation.
According to an embodiment of the present invention, the lamp further comprises an electrical connector, wherein the electrical connector is used for electrically connecting the driving power source and the lamp body, and the electrical connection between the lamp body and the driving power source is realized through the electrical connector.
According to an embodiment of the present invention, the lighting device further comprises a clamp, wherein the clamp is disposed on the light pole, and the lamp housing and the lamp body are fixed by the clamp.
According to one embodiment of the invention, the clamp comprises a fixed bottom plate and at least one pressing plate, wherein a clamping space is arranged between the bottom plate and the pressing plate, and the electric connector of the LED street lamp can be fixed in the clamping space by the fixed bottom plate and the pressing plate.
According to another aspect of the present invention, the present invention further provides a method for controlling an LED street lamp, wherein the method for controlling an LED street lamp comprises the following steps:
(a) outputting a given current I and a given voltage V to a lamp body, wherein the lamp body comprises a circuit board, and at least one LED chip and a plurality of lamp beads which are arranged on the circuit board, wherein the at least one LED chip and the plurality of lamp beads are electrically connected through the circuit board, and the plurality of lamp beads are arranged on the circuit board in a series-parallel mode; and
(b) and controlling the LED chip to work below rated working current based on the light emitting characteristics of the LED chip so as to improve the light source lighting effect of the LED street lamp.
According to one embodiment of the present invention, the number of the lamp beads is S ═ m × n, the lamp bead arrangement is performed in a m-serial-n parallel manner, and the photoelectric characteristics of the chip can be known as:
V＝V1+V2+…+Vm
I＝I1+I2+…Inwherein by the lamp bead (I)1,I2,…,In) The current value of (a) is controlled to be 69.5% or less of the rated operating current of the LED chip.
According to an embodiment of the invention, the at least one LED chip is integrated on the circuit board in a serial or/and parallel manner, and is electrically connected to the circuit board and the phase of the lamp body through a driving power supply, and the driving power supply outputs the given current and voltage, and the current passing through the LED chip is reduced through the lamp bead and the circuit board, so as to control the lighting effect of the light source of the LED street lamp.
According to one embodiment of the invention, the operating voltage output by the driving power supply is 100V to 150V.
Further objects and advantages of the invention will be fully apparent from the ensuing description and drawings.
These and other objects, features and advantages of the present invention will become more fully apparent from the following detailed description and the accompanying drawings.
Drawings
FIG. 1 is a schematic structural diagram of the present invention.
Fig. 2 is a schematic perspective view of an LED lamp body according to the present invention.
Fig. 3 is a schematic front view of the LED lamp body according to the present invention.
Fig. 4 is a schematic top view of the LED lamp body according to the present invention.
Fig. 5 is a left side view structural schematic diagram of the LED lamp body according to the present invention.
Fig. 6 is a right view structural schematic diagram of the LED lamp body according to the present invention.
Fig. 7 is a schematic bottom view of the LED lamp body according to the present invention.
FIG. 8 is a schematic structural diagram of an LED lamp bead patch PCB board in the invention.
Fig. 9 is a schematic top view of the lamp bead of the present invention.
Fig. 10 is a schematic view of the structure of the lamp bead of the present invention.
FIG. 11 is a schematic view of the connecting plate according to the present invention.
Fig. 12 is a schematic structural diagram of an LED street lamp according to a second preferred embodiment of the invention.
Fig. 13A and 13B are schematic structural diagrams of a lamp body of the LED street lamp according to the second preferred embodiment of the invention.
Fig. 14 is a schematic diagram of a design of an LED bead patch of the LED street lamp according to the second preferred embodiment of the invention.
Fig. 15A and 15B are schematic structural views of a lamp housing of the LED street lamp according to the second preferred embodiment of the invention.
Fig. 16 is a schematic view illustrating an installation of the heat dissipation fan of the LED street lamp according to the second preferred embodiment of the invention.
Fig. 17A to 17B are schematic structural views of a fixing clip of the LED street lamp according to the second preferred embodiment of the invention.
Fig. 18 is a flowchart illustrating a control method of the LED street lamp according to the second preferred embodiment of the invention.
Detailed Description
The following description is presented to disclose the invention so as to enable any person skilled in the art to practice the invention. The preferred embodiments in the following description are given by way of example only, and other obvious variations will occur to those skilled in the art. The basic principles of the invention, as defined in the following description, may be applied to other embodiments, variations, modifications, equivalents, and other technical solutions without departing from the spirit and scope of the invention.
It will be understood by those skilled in the art that in the present disclosure, the terms "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like are used in an orientation or positional relationship indicated in the drawings for ease of description and simplicity of description, and do not indicate or imply that the referenced devices or components must be in a particular orientation, constructed and operated in a particular orientation, and thus the above terms are not to be construed as limiting the present invention.
It is understood that the terms "a" and "an" should be interpreted as meaning that a number of one element or element is one in one embodiment, while a number of other elements is one in another embodiment, and the terms "a" and "an" should not be interpreted as limiting the number.
The invention will be further described with reference to specific embodiments shown in the drawings.
Referring to fig. 1-10, a novel high-light-efficiency low-energy-consumption LED street lamp includes a split-type LED lamp body 1 and an LED driving power supply 2. The LED lamp body 1 comprises a shell 3 made of high-heat-conduction materials, the plane part of the shell 3 is attached to an LED lamp bead patch PCB 4, and the top of the shell 3 is provided with a radiating fin 5 and a radiating fan 6. One end of the shell 3 is provided with a convenient mounting component 7, and the LED lamp bead patch PCB board 4 and the cooling fan 6 are connected with the LED driving power supply 2 through wires.
LED lamp pearl paster PCB board 4 includes PCB base plate 8, and PCB base plate 8' S plane part is equipped with m and concatenates n and the lamp pearl 9 of structural arrangement, and wherein m, n are greater than or equal to 1, and m lamp pearl 9 concatenates into one row promptly, and n is arranged such lamp pearl 9 parallelly connected, and lamp pearl total number S on the PCB base plate 8 is m x n. The PCB substrate 8 is attached to the plane part of the shell 3, so that the heat of the lamp bead 9 is easier to radiate. The lamp bead 9 includes an SMD holder 10, and N (N is greater than or equal to 1) LED chips 11 are arranged in the SMD holder 10, where the N LED chips are arranged in series or/and parallel circuit (i.e. a is connected in series with B, where a is equal to B. The LED chips 11 are integrated in the SMD holder 10 in series or/and parallel, and the LED chips 11 can be selected from chips with different power ratings.
Radiating fin 5 extends along the length direction of shell 3, and radiating fin 5's one end is equipped with the logical groove 12 that is used for installing radiator fan 6, and radiating fin 5 and 3 formula structures as an organic whole of shell are favorable to the heat of LED lamp pearl to dispel the heat fast to reduce the wick temperature. The radiating fins 5 and the radiating fan 6 are combined to conduct active heat radiation, so that effective heat radiation can be guaranteed, meanwhile, the manufacturing cost of aluminum alloy is reduced, and the LED bulb has very important significance in popularization of novel LED bulbs.
In the embodiment, the housing 3 is made of a high thermal conductivity aluminum alloy material, and has high corrosion resistance and oxidation resistance; the novel shell is designed with enough heat dissipation area and is attached to the PCB, and the novel appearance design is adopted, so that light source heat on the PCB can be effectively and quickly dissipated. In other embodiments, the housing 3 is also made of a copper material with high thermal conductivity.
Convenient installation component 7 is the drum structure, and the peripheral cover of convenient installation component 7 is equipped with connecting bottom plate 13, and connecting bottom plate 13 middle part is equipped with the mounting hole 18 that corresponds with convenient installation component 7, and the periphery of mounting hole 18 is equipped with 4 bolt holes that are used for passing the bolt, locks through the bolt between convenient installation component 7 and the connecting bottom plate 13 for install convenient installation component 7 in lamp shade 17 through bottom plate 13. Stability and reliability against various disturbances (typhoon, vibration, etc.) during later use can be ensured, and further improvement in safety and reliability after replacement is ensured by the easy-to-mount member 7.
The LED street lamp further comprises a lamp post 16, a lampshade 17 used for installing the LED lamp body 1 is arranged at the top of the lamp post 16, the LED driving power supply 2 is installed at the bottom of the lamp post 16, and the LED lamp body 1 and the LED driving power supply 2 are connected with each other through an electric wire in the lamp post 16. Because the LED street lamp basically adopts the structure of integrating the LED lamp and the power supply at present, the service life of the LED can reach 10 ten thousand hours, but the LED driving power supply does not keep up with the actual service life of the LED at present. In the actual use process, the failed LED lamp is caused by the failure of the LED driver with a high probability, which also brings great maintenance cost (including lifting cars, road control, etc.) to the later maintenance process of the LED street lamp, further hindering the popularization and application of the LED street lamp. Therefore, the implementation process of the invention adopts the technology of separating the LED lamp body 1 from the LED driving power supply 2, the LED lamp body 1 of the original street lamp is reserved, only the new LED driving power supply 2 needs to be replaced, the resources are saved to the maximum extent, and the problems of the direction and the storage of the original shell after the LED lamp is replaced at present are solved; meanwhile, the LED driving power supply 2 is arranged at the bottom of the street lamp pole 16 by combining the selection principle (high-voltage low-current scheme) of the LED driving power supply, so that the later maintenance cost of the LED street lamp bulb is greatly reduced.
The utility model provides a novel high light efficiency low energy consumption LED street lamp's control method, is less than LED chip 11's rated current through controlling LED drive power supply 2 output current control n and the operating current of lamp pearl 9, and LED drive power supply 2 outputs given current I and voltage V, can know by the chip photoelectric characteristic:
V＝V1+V2+…+Vm
I＝I1+I2+…In；
according to the LED lamp, the driving power supply is adopted to output high voltage and small current, and the working current (I1, I2, … and In) of the n-folded lamp beads 9 is reduced to be less than 65% of the rated working current of the LED chip 11 according to the light emitting characteristics of the LED chip, so that the light efficiency of the LED lamp is improved by more than 30%. Particularly, when the working current of the LED chip 11 is less than 20% of the rated current, the light efficiency of the light source can be improved by more than 55%, and in the prior art, the light efficiency can reach more than 230LM/W, and high light efficiency means high electro-optic conversion efficiency, thereby improving the effective utilization of electric energy.
The invention can improve the luminous efficiency of the LED light source and improve the electro-optic conversion efficiency. The PCB is combined with the LED driving power supply, and the LED chip is driven in a high-voltage low-current mode, so that the chip is prevented from working under the condition of high current, and the light attenuation resistance and the thermal stability of the LED are improved. The light source of the invention has high lighting effect, high luminous intensity of the lamp beads and high power density, can effectively improve the energy utilization rate, achieves the effects of energy conservation and emission reduction, and improves the energy-saving rate by more than 80 percent compared with the traditional high-energy consumption street lamp. The invention solves the heat dissipation problem of 3 core links of connecting the chip to the lamp bead, connecting the lamp bead to the substrate and connecting the substrate to the shell device through a novel shell design and an active heat dissipation device, and can effectively prolong the service life of the LED light source. The LED street lamp adopts the LED bulb and LED drive separation technology, greatly reduces the later maintenance cost of the LED street lamp, and is beneficial to the popularization of the LED street lamp. Only the bulb needs to be replaced, the original street lamp shell does not need to be replaced, and waste of resources is greatly reduced.
The above is only a preferred embodiment of the present invention, and it should be noted that it is obvious to those skilled in the art that several variations and modifications can be made without departing from the structure of the present invention, which will not affect the effect of the implementation of the present invention and the utility of the patent.
Referring to fig. 12 to 18 of the drawings accompanying the present specification, an LED street lamp and a control method thereof according to a second preferred embodiment of the present invention will be explained in the following description. The LED street light is adapted to be installed on a light pole 100A, wherein the LED street light is supported by the light pole 100A and irradiates in a specific direction to form a specific illumination area. The street lamp post 100A comprises a support rod 101A and an extension rod 102A supported and extended from the support rod 101A, wherein the support rod 101A is fixed on the ground, and the extension rod 102A extends outwards from the top of the support rod 101A, so that the street lamp can provide a suitable illumination area.
The LED street lamp includes a lamp body 10A and a driving power source 20A electrically connected to the lamp body 10A, wherein the driving power source 20A is separated from the lamp body 10A, the lamp body 10A is disposed on the extension rod 102A of the light pole 100A, the driving power source 20A is disposed on the support rod 101A of the light pole 100A, and the driving power source 20A provides operating power to the lamp body 10A and controls an operating state of the lamp body 10A. It is worth mentioning that the driving power source 20A is installed inside the support rod 101A, and the driving power source 20A is protected by the support rod 101A. Preferably, in the preferred embodiment of the present invention, the driving power source 20A is disposed above the ground to facilitate inspection and replacement by workers.
The technical personnel in the field can understand that the LED street lamp replaces the high-energy-consumption street lamp at present and basically adopts an integrated structure of an LED lamp and a power supply, the service life of the LED can reach 10 ten thousand hours, but the LED driving power supply does not keep up with the actual service life of the LED at present; in the actual use process, the failed LED lamp is caused by the failure of the LED driving with a high probability, which also brings great maintenance cost (including lifting cars, road control, etc.) to the later maintenance process of the LED street lamp. Therefore, in the preferred embodiment of the invention, the technology of separating the LED bulb from the power supply is adopted, the original street lamp housing is reserved, the traditional light source is replaced by the novel LED bulb, the resources are saved to the greatest extent, and the problems of orientation and storage of the original housing after the LED lamp is replaced at present are solved.
As shown in fig. 13A and 13B, the lamp body 10A includes a circuit board 11A, at least one LED chip 12A disposed on the circuit board 11A, and a plurality of beads 13A, wherein the plurality of beads 13A and the at least one LED chip 12A are electrically connected through the circuit board 11A. Preferably, the at least one LED chip 12A and the plurality of beads 13A are distributed on two sides of the circuit board 11A. The circuit board 11A has a front surface and a back surface facing back from the front surface, wherein the at least one LED chip 12A is disposed on the back surface of the circuit board 11A, and the plurality of beads 13A are disposed on the front surface of the circuit board 11A.
Preferably, in this preferred embodiment of the present invention, the circuit board 11A is implemented as a PCB circuit board. The at least one LED chip 12A includes an SMD holder 121A and at least one chip unit 122A disposed on the SMD holder 121A, wherein the chip unit 122A is fixed to the reverse surface of the circuit board 11A by the SMD holder 121A. It is worth mentioning that the SMD support is internally distributed with N (N is more than or equal to 1) LED chips and a circuit structure, the LED chips are integrated in the SMD support in a serial connection or/and parallel connection mode, and the LED chips can select chips with different rated powers. Preferably, in the preferred embodiment of the present invention, the light source is encapsulated by using a low thermal resistance and stable encapsulating material.
As shown in fig. 13B, the packaged light source is designed to be arranged on a PCB, and in the implementation method, the lamp bead arrangement is arranged in a manner of m strings and n parallel (i.e., mCnB). In detail, in the preferred embodiment of the present invention, the plurality of lamp beads 13A are attached to the front surface of the circuit board 11A in a series-parallel manner. And setting the total number of the lamp beads 13A as S ═ m × n, wherein m of the lamp beads 13A are connected in series, and n of the m lamp beads 13A are connected in parallel to form a lamp bead array.
In the preferred embodiment of the invention, according to the light-emitting characteristics of the LED chip, the novel LED lamp bead package is adopted, and the unique PCB circuit design and the selection of the output parameters of the LED driving power supply are combined, so that the novel bulb under the technical scheme has higher light-emitting efficiency, and compared with a common LED lamp, the photoelectric conversion efficiency is greatly improved, and the effective utilization of energy is improved.
In the preferred embodiment of the present invention, the driving power source 20A is electrically connected to the circuit board 11A of the lamp body 10A, and the driving power source 20A outputs a given current I and a given voltage V, which are known from the chip optoelectronic characteristics:
V＝V1+V2+…+Vm
I＝I1+I2+…In
preferably, in the preferred embodiment of the present invention, the driving power supply 20A outputs a high voltage, and a small current is formed through the lamp bead 13A, so that the n-parallel LED lamp beads (I) are connected based on the design of the PCB circuit according to the light emitting characteristics of the LED chip1,I2,…,In) The current value of the LED light source is controlled to be less than 69.5% of the rated working current of the LED chip, and therefore the lighting effect of the LED light source on the PCB is improved by more than 30%. More preferably, when the operating current of the LED chip 12A is less than 46.5% of the rated current, the light efficiency of the light source can reach 230LM/W or more, and high light efficiency means high electro-optical conversion efficiency, thereby improving the effective utilization of electric energy. That is to say, the driving power supply outputs high voltage, and the working current of the LED chip 12A is controlled to be below 46.5% of the rated current through the circuit board 11A, so that the light source efficiency of the lamp bead 13A reaches above 230LM/W, and the effective utilization of electric energy is further improved. Preferably, in the preferred embodiment of the present invention, the operating current of the LED chip 11A is 25.5% or less of the rated current.
It is worth mentioning that the driving power supply 20A outputs rated voltage and current to the lamp body 10A, the current flowing through the LED chip 12A is controlled by the arrangement of the circuit board 11A, the LED chip 12A and the lamp beads 13A of the lamp body 10A, and the voltage at two ends of the series circuit is equal to the sum of the voltage drops of the lamp beads connected in series; the sum of the currents of the parallel circuits is the total current. In short, the driving power supply 20A outputs high voltage and constant current, and the arrangement of the lamp beads of the lamp body 10A controls the current flowing through the LED chip 12A to be less than 69.5% of the rated current, thereby improving the lighting effect. Preferably, in the preferred embodiment of the present invention, the driving power supply 20A outputs a high voltage and a constant current, and the arrangement of the lamp beads of the lamp body 10A controls the current flowing through the LED chip 12A to be less than 46.5% of the rated current, so as to improve the lighting effect.
As will be understood by those skilled in the art, the driving power source 20A is electrically connected to the lamp body 10A in a high voltage output manner, which can effectively reduce the line loss, i.e., the power loss between the driving power source 20A and the lamp body 10A in the split structure of the driving power source 20A and the lamp body 10A. Preferably, the output voltage value of the driving power supply 20A is between 100 and 150V.
As shown in fig. 15A and 15B, in the preferred embodiment of the present invention, the LED street lamp further includes a lamp housing 30A, wherein the lamp body 10A is fixed to the lamp housing 30A, and the lamp body 10A is fixedly supported by the lamp housing 30A. The lamp body 10A is attached to the lamp housing 30A, heat generated by the lamp body 10A in the working process is transferred to the lamp housing 30A, and the lamp housing 30A dissipates heat outwards, so that the heat accumulation is prevented from affecting the service life of the lamp body 10A.
Preferably, in the preferred embodiment of the present invention, the lamp housing 30A is made of an aluminum alloy material, so as to reduce the temperature of a P-N junction of the LED lamp bead during use, avoid color temperature drift of the phosphor, and yellowing easily, effectively solve the problem of low light emitting efficiency caused by undesirable color temperature drift of the phosphor, and improve the service life of the LED light source.
The lamp housing 30A includes a supporting plate 31A, at least one heat dissipating fin 32A disposed on the supporting plate 31A, and a connecting end 33A, wherein the supporting plate 31A is a flat plate structure, the lamp body 10A is fixed to the supporting plate 31A, and the supporting plate 31A fixedly supports the lamp body 10A. The circuit board 11A of the lamp body 10A is fixed to the support plate 31A, wherein heat generated by the operation of the lamp body 10A is conducted to the support plate 31A of the lamp housing 30A. The heat dissipation fins 32A are integrally formed on the other side of the support plate 31A, and the heat dissipation area is increased by the heat dissipation fins 32A, thereby improving the heat dissipation effect of the lamp housing 30A. Preferably, the heat dissipation fins 32A are longitudinally arranged in a fin shape on the back side of the support plate 31A, wherein the heat dissipation fins 32A are located on opposite sides of the lamp body 10A.
A plurality of flow guide grooves 320A are formed between the heat dissipation fins 32A, wherein the flow guide grooves 320A are connected to the external environment and allow the airflow to pass through. In other words, the flow guiding grooves 320A between the heat dissipating fins 32A are used to guide the flow direction of the airflow, so that the hot airflow moves from the inside to the outside, thereby facilitating heat conduction and cooling.
Accordingly, the heat dissipation fins 32A are inclined from the connection end 33A along the longitudinal direction to form a streamline structure with a high inner side and a low outer side, so that the flow guide grooves 320A between the heat dissipation fins 32A have a structure with a deep inner side and a shallow outer side, so that the inner hot air flows through the flow guide grooves 320A to the outer side. It is understood that in a rainy weather, water may be guided by the heat dissipation fins 32A to move from the inside to the outside through the guide grooves 320A, thereby preventing water from entering the inside of the lamp body 10A.
The connection end 33A is located at one side of the support plate 31A, and connects and supports the support plate 31A to extend to one side through the connection end 33A. Preferably, in this preferred embodiment of the present invention, the connection end 33A is implemented as a half-loop-mounted connection structure.
It should be noted that, in the preferred embodiment of the present invention, the circuit board 11A of the lamp body 10A is fixed to the supporting plate 31A of the lamp housing 30A in a heat-conducting manner, wherein the heat generated by the lamp body 10A is conducted to the supporting plate 31A through the circuit board 11A, and then is dissipated by the supporting plate 31A and the heat dissipation fins 32A, so as to reduce the temperature of the lamp body 10A. In other words, in the preferred embodiment of the present invention, the lamp housing 30A is made of a high thermal conductive aluminum alloy material, which has high corrosion resistance and oxidation resistance; the lamp housing 30A is designed to have a sufficient heat dissipation area to be attached to a PCB, and a novel appearance design is adopted, so that light source heat on the PCB can be dissipated effectively and rapidly.
The LED street lamp further comprises a heat sink 40A, wherein the heat sink 40A is disposed on the lamp housing 30A, and the heat sink 40A dissipates heat to the lamp housing 30A in an active heat dissipation manner. The heat sink 40A is electrically connected to the driving power source 20A, and the driving power source 20A supplies operating power to the heat sink 40A. The lamp housing 30A is further provided with a mounting groove 300A, and the heat sink 40A is fixedly disposed in the mounting groove 300A of the lamp housing 30A. It should be noted that the mounting groove 300A of the lamp housing 30A is formed inside the heat dissipation fin 32A of the lamp housing 30A, and the heat sink 40A is fixed to the mounting groove 300A of the lamp housing 30A by the support plate 31A.
Preferably, in the preferred embodiment of the present invention, the heat sink 40A is implemented as a heat dissipation fan, wherein the heat sink 40A blows air towards the heat dissipation fins 32A when powered on, so as to accelerate the air flow, thereby improving the heat dissipation effect. It will be understood by those skilled in the art that the specific embodiment of the heat sink 40A is shown herein by way of example only, and not by way of limitation. In other alternative embodiments of the present invention, the heat sink 40A may also be implemented as other heat dissipating devices, such as a water cooling device. It should be noted that, in the preferred embodiment of the present invention, the lamp housing 30A is added with the heat sink 40A for active heat dissipation, so as to ensure effective heat dissipation and reduce the manufacturing cost of the aluminum alloy.
As shown in fig. 16, the LED street lamp further includes an electrical connector 50A, wherein the electrical connector 50A is used to electrically connect the driving power source 20A and the lamp body 10A, i.e., the electrical connection between the lamp body 10A and the driving power source 20A is realized through the electrical connector 50A. The electrical connector 50A is fixedly connected with the lamp housing 30A, and is connected and fixed with the lamp housing 30A through the electrical connector 50A. It is worth mentioning that in this preferred embodiment of the present invention, the light bulb installed in the existing light pole can be replaced without changing the light pole 100A of the prior art. The electric connector 50A includes a fixed end 51A and certainly an electricity link 52A that the integrative outside extends of fixed end 51A, wherein the electric connector 50A the fixed end 51A with the lamp body 30A link 33A is connected fixedly mutually, wherein the electric connector 50A electricity link 52A is helical structure, and pass through electricity link 52A with the positive and negative pole looks electric connection of drive power supply 20A.
The LED street lamp further includes a clamp 60A, wherein the clamp 60A is disposed on the lamp post 100A, and fixes the lamp housing 30A and the lamp body 10A by the clamp 60A, so as to prevent the stability of the LED street lamp from being affected by vibration or wind. The clamp 60A is fixed to the extension rod 102A of the light pole, and the electrical connector 50A is fixed by the clamp 60A in a clamping manner, so that the installation stability of the LED street lamp is increased. In short, in the preferred embodiment of the present invention, during the replacement of the conventional high energy consumption street lamp bulb by the lamp body 10A of the LED street lamp, since the lamp housing 30A and the lamp body 10A have a certain weight, in order to ensure stability and reliability against various disturbances (typhoon, vibration, etc.) during the later use, the safety and reliability after the replacement are further improved by the clip 60A.
The fixture 60A includes a fixed base plate 61A and at least one pressing plate 62A, wherein a clamping space 601A is provided between the base plate 61A and the pressing plate 62A, and the electrical connector 50A of the LED street lamp can be fixed in the clamping space 601A by the fixed base plate 61A and the pressing plate 62A. It will be appreciated that the shape and size of the clamping space 601A of the clamp 60A is adapted to the shape and size of the electrical connector 50A.
The clamp 60A further includes a pad 63A, wherein the pad 63A is disposed inside the pressing plate 62A of the clamp 60A, the clamping force and the vibration of the pressing plate 62A on the electrical connector 50A are buffered by the pad 63A, and the relative sliding of the electrical connector 50A is prevented by the pad 63A, thereby maintaining the stability of the installation. Preferably, in this preferred embodiment of the present invention, the pad 63A is implemented as a rubber pad or a plastic spring pad. More preferably, the liner 63A is wrapped inside the platen 62A.
It is worth mentioning that in the preferred embodiment of the invention, on the basis of reserving the street lamp pole in the prior art, the original street lamp shell is reserved by replacing the bulb in the prior art, the LED street lamp is used for replacing the traditional light source, so that the resource is saved to the greatest extent, and the problems of orientation and storage of the original shell after the LED street lamp is used for replacing at present are solved; meanwhile, the driving power supply 20A is arranged at the bottom of the street lamp pole by combining the selection principle (high-voltage low-current scheme) of the driving power supply 20A, so that the later maintenance cost of the LED street lamp is greatly reduced.
It should be noted that, in the preferred embodiment of the present invention, the housing made of an excellent aluminum alloy material is adopted, and an active heat dissipation manner is combined, so that the temperature of the P-N junction of the LED lamp bead is reduced in the using process, the color temperature drift of the phosphor is avoided, the phenomenon of yellowing is easily caused, the problem of low luminous efficiency caused by the bad phenomenon of color temperature drift of the phosphor is effectively solved, and the service life of the LED light source is prolonged. Through the fixed centre gripping of anchor clamps 60A for LED street lamp has higher security and reliability after the replacement, and this system adopts the embodiment of lamp body 10A and drive power supply 20A power separation simultaneously, has greatly reduced the maintenance cost in LED street lamp later stage. The implementation of the invention does not need to replace the original lampshade, can achieve the purposes of reducing energy consumption and improving economic benefits, and further popularizes the application of the LED light source in the general illumination field, thereby having great practical value.
A specific example of the LED street lamp is provided below, wherein the voltage output by the driving power supply 20A is DC100V, and the output current is 450 mA; the rated power of the LED chip 12A is 0.5w, and the rated current is 150 mA; the packaging specification of the lamp beads is 2 strings and 1 parallel, namely the LED chips are 2 strings and 1 parallel; wherein the circuit board 11A design specification: 19, 22 parallel strings, that is, the number of the lamp beads 13A is 418. It can be understood that the current of the LED chip 12A is controlled by the circuit design of the lamp bead 13A and the circuit board, wherein the current passing through the LED chip 13A is 20mA, and the light effect is controlled by controlling the current of the LED chip 13A.
It is worth mentioning that the specific example of the LED street lamp described above is merely exemplary and not limiting. Therefore, in other embodiments of the present invention, the LED street lamp can be implemented in other alternative ways, which are not limited herein.
In the preferred embodiment of the invention, the design process of the LED street lamp comprises the steps of selecting an LED chip based on the output overall lighting effect, selecting the packaging specification of a lamp bead according to the selected chip, and then determining the power supply parameters and the design of a circuit board. In short, in the present invention, a small current of the current is defined by the packaging manner of the LED chip 12A and the lamp bead, so as to realize high light efficiency of the street lamp.
It is worth mentioning that, in the above specific example, if the lamp bead packaging specification is: 1 string and 2 parallel (the number of the LED chips 12A placed on the bracket is unchanged, but the serial-parallel mode is changed), if the current flowing through the LED chips 12A is controlled to be about 20mA, the corresponding circuit design specification of the circuit board 11A is 38 strings and 11 parallel, so as to keep the same whole light effect output. That is, different light effects can be realized by changing the series-parallel connection mode of the LED chip 12A and the circuit design of the circuit board 11A.
It is worth mentioning that, in the preferred embodiment of the present invention, for different LED chips 12A and different packaging forms of the lamp beads 13A (i.e. the initial light effect is predetermined), the driving power supply 20A drives and the circuit board 11A controls the output of the light effect of the whole lamp (depending on the peak value of the light effect of the chip). The current of the LED chip 12A is controlled by specification setting of the circuit design of the lamp bead 13A and the circuit board 11A.
It is worth mentioning that the light effect of the lamp bead packaged by the LED chip 12A is smaller as the current increases. The whole lamp is 200 LM/W; then the light efficiency of the lamp bead (i.e. the initial light efficiency) needs to consider the loss of the following factors: the power efficiency (9-10% loss), the light interference loss between lamp beads is about 5%, and the loss of the shell (determined according to the specific shell and measured) can be roughly calculated to ensure that the light efficiency of the original lamp beads is more than 240LM/W and the light efficiency of the whole lamp can be 200 LM/W. The circuit of the PCB and the lamp bead can be designed by knowing the approximate value of the current flowing through the chip. For example, the light efficiency of 200LM/W is achieved by setting the whole lamp, designing a PCB and selecting a corresponding LED driving power supply.
Referring to another aspect of the present invention, as shown in fig. 18, the present invention further provides an LED street lamp control method, wherein the LED street lamp control method includes the steps of:
(a) outputting a given current I and a given voltage V to a lamp body 10A, wherein the lamp body 10A includes a circuit board 11A, and at least one LED chip 12A and a plurality of lamp beads 13A disposed on the circuit board 11A, wherein the at least one LED chip 12A and the plurality of lamp beads 13A are electrically connected through the circuit board 11A, and wherein the plurality of lamp beads 13A are arranged on the circuit board 11A in a series-parallel manner; and
(b) and controlling the LED chip 12A to work below rated working current based on the light emitting characteristics of the LED chip so as to improve the light source lighting effect of the LED street lamp.
In the above LED street lamp control method of the present invention, the number of the lamp beads 13A is S ═ m × n, the lamp bead arrangement is arranged in a m-string-n-parallel (i.e., mCnB) manner, and the photoelectric characteristics of the chip are known as:
V＝V1+V2+…+Vm
I＝I1+I2+…Inwherein by the lamp bead (I)1,I2,…,In) The current value of (a) is controlled to be 69.5% or less of the rated operating current of the LED chip.
In the LED street lamp control method of the present invention, the at least one LED chip 12A is integrated on the circuit board 11A in a serial or/and parallel manner. The LED street lamp is electrically connected with the circuit board 11A of the lamp body 10A through a driving power supply 20A, the driving power supply 20A outputs the given current and voltage, and the current passing through the LED chip is reduced through the lamp bead and the circuit board 11A so as to control the light source lighting effect of the LED street lamp.
Preferably, in the preferred embodiment of the present invention, the operating voltage output by the driving power supply 20A is 100V to 150V.
It will be appreciated by persons skilled in the art that the embodiments of the invention described above and shown in the drawings are given by way of example only and are not limiting of the invention. The objects of the invention have been fully and effectively accomplished. The functional and structural principles of the present invention have been shown and described in the examples, and any variations or modifications of the embodiments of the present invention may be made without departing from the principles.

Claims (16)

1. An LED street lamp, comprising:
a lamp body; and
a drive power supply, wherein the lamp body includes a circuit board, set up in at least an LED chip and a plurality of lamp pearl of circuit board, wherein a plurality of lamp pearls with at least an LED chip passes through electrical connection is realized to the circuit board, wherein the lamp body the circuit board with drive power supply electrically connects, drive power supply output given current and voltage, through the circuit board with a plurality of lamp pearl control the LED chip is being less than below rated operating current work to improve the light efficiency.
2. The LED street lamp according to claim 1, wherein the total number of the plurality of lamp beads is S ═ m × n, the lamp beads are arranged in m series-n parallel, the driving power supply outputs a given current I and a given voltage V, and the photoelectric characteristics of the chip are known as:
V＝V1+V2+…+Vm
I＝I1+I2+…In；
so that n is connected with the LED lamp bead (I)1,I2,…,In) The current value of (a) is controlled to be 69.5% or less of the rated operating current of the LED chip.
3. The LED street light according to claim 2, wherein the at least one LED chip comprises an SMD holder and at least one chip unit disposed on the SMD holder, wherein the chip unit is fixed to the circuit board by the SMD holder.
4. The LED street light according to claim 3, wherein the chip units are integrated in the SMD holder in series or/and in parallel.
5. The LED street lamp according to claim 2, wherein the LED chip operating current is controlled to be below 25.5% of the rated current.
6. The LED street light according to claim 2, wherein the driving power source is provided separately from the lamp body so that the driving power source is mounted on a support rod of a street light pole, and the lamp body is fixed to an extension rod of the street light pole.
7. The LED street lamp according to any one of claims 2 to 6, further comprising a lamp housing, wherein the lamp body is fixed to the lamp housing, and heat generated during operation is transferred to the lamp housing, and dissipated outwards by the lamp housing.
8. The LED street lamp according to claim 7, wherein the lamp housing comprises a support plate and at least one heat dissipation fin disposed on the support plate, wherein the support plate has a plate-shaped structure, the lamp body is fixed to the support plate, and the support plate fixedly supports the lamp body, wherein heat generated by the operation of the lamp body is transferred to the support plate of the lamp housing, and the heat dissipation fin is integrally formed on one side of the support plate, thereby increasing a heat dissipation area.
9. The LED street light according to claim 8, wherein a plurality of flow guide grooves are formed between the heat dissipation fins, wherein the flow guide grooves are communicated with the external environment, and the flow guide grooves between the heat dissipation fins are used for guiding the flowing direction of the airflow.
10. The LED street lamp according to claim 8, further comprising a heat sink, wherein the heat sink is disposed on the lamp housing, and the heat sink actively dissipates heat from the lamp housing.
11. The LED street light according to claim 8, further comprising an electrical connector, wherein the electrical connector is used to electrically connect the driving power source and the lamp body, and the electrical connection between the lamp body and the driving power source is achieved through the electrical connector.
12. The LED street light according to claim 11, further comprising a clip, wherein the clip is disposed on the light pole, and the lamp housing and the lamp body are fixed by the clip.
13. The LED street light according to claim 12, wherein the clamp comprises a fixed bottom plate and at least one pressing plate, wherein a clamping space is formed between the bottom plate and the pressing plate, and the electrical connector of the LED street light can be fixed in the clamping space by the fixed bottom plate and the pressing plate.
14. The LED street lamp control method is characterized by comprising the following steps:
(a) outputting a given current I and a given voltage V to a lamp body, wherein the lamp body comprises a circuit board, and at least one LED chip and a plurality of lamp beads which are arranged on the circuit board, wherein the at least one LED chip and the plurality of lamp beads are electrically connected through the circuit board, and the plurality of lamp beads are arranged on the circuit board in a series-parallel mode; and
(b) and controlling the LED chip to work below rated working current based on the light emitting characteristics of the LED chip so as to improve the light source lighting effect of the LED street lamp.
15. The control method according to claim 14, wherein the number of the lamp beads is S ═ m × n, the lamp bead arrangement is arranged in a m-serial-n-parallel manner, and the photoelectric characteristics of the chip are known as:
Figure FDA0003228971800000021
wherein by the lamp bead (I)1,I2,…,In) The current value of (a) is controlled to be 69.5% or less of the rated operating current of the LED chip.
16. The control method according to claim 15, wherein the at least one LED chip is integrated on the circuit board in series or/and parallel, electrically connected to the circuit board and the phase of the lamp body through a driving power source, and the driving power source outputs the given current and voltage, and the current passing through the LED chip is reduced through the lamp bead and the circuit board, so as to control the lighting effect of the light source of the LED street lamp.
CN202110980663.4A 2020-10-27 2021-08-25 LED street lamp and control method thereof Pending CN113898903A (en)

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