CN101240892B - High heat dispersion LED road lamp - Google Patents

Abstract

The present invention provides a LED street lamp having high heat dispersion, including a LED source and its driving circuit, the LED source and its driving circuit are fixed on the aluminum base circuit wafer, characterized in that the aluminum base circuit wafer is fixed on the metallic lamp case, being integrity with radiator and lamp. The LED street lamp of the invention greatly enhances the radiating performance of the LED circuit wafer, reduces working temperature of LED directional light, enhances working life of LED source.

Description

A LED street lamp with high heat dissipation performance

technical field

The invention relates to LED lighting technology, in particular to a high-power LED street lamp with high heat dissipation performance.

Background technique

As a new generation of light source technology, LED lighting technology has the characteristics of energy saving, environmental protection, long life and small size, and can be widely used in various indications, displays, decorations, backlights, general lighting and urban night scenes.

The LED light source adopts a modular combination of self-contained constant current drive and DC drive. With ultra-low power consumption, compared with traditional light sources, it can save energy by more than 80%.

The service life of LED is generally considered to be 100,000 hours under ideal conditions. In actual use, its light intensity will gradually decay with time (that is, light decay), that is, the efficiency of the LED light source to convert electrical energy into light energy will gradually decrease.

In the application of LED light source, especially in the application of high-power and high-brightness LED light source, the light decay of LED light source is directly related to its node operating temperature. When the operating temperature of the node is higher than 60°C, the working life of the light source will be significantly reduced. Experiments have shown that: when the operating temperature of the LED exceeds 60°C, the LED light decay will increase by 10% for every 5°C increase in the operating temperature of the LED. Under normal circumstances, the operating temperature of the LED should be controlled The service life of more than 50,000 hours can be guaranteed only when the temperature is below 60°C. Therefore, how to reduce the node temperature has become the key to ensure the reliable working life of the LED light source. However, in practical applications, for the sake of aesthetic appreciation, the lamps often cannot be made too large, so the LED light source and its driving circuit chip are often set in Within a limited space, the operating temperature of nodes is reduced entirely by natural heat dissipation, so the effect is very poor.

In order to better control and reduce the working temperature of LED nodes, people use metal-based circuit boards with strong heat dissipation performance (such as aluminum-based circuit boards) to improve the heat dissipation effect of LED nodes. However, since circuit boards often need to be sealed in the lamp shell Inside the body, the aluminum-based circuit board uses the limited air in the lamp for conduction and heat dissipation, which is difficult to achieve the desired effect.

At present, LED street lamps at home and abroad are basically converted from conventional street lamp shells. Its disadvantages are: the volume and shape of the lamp shell of the street lamp are limited, and the volume used for the LED radiator cannot be very large, so the thermal conductivity is low, and the heat generated by the LED light source cannot be directly exported from the lamp shell quickly; the heat of the light source is concentrated, and the working temperature of the LED is too high. High, the LED power cannot be made too large. This limits the application and promotion of high-power and high-brightness LED light sources in urban lighting and landscapes such as street lamps.

Contents of the invention

In view of the shortcomings and deficiencies in the prior art, the purpose of the present invention is to provide an LED street lamp with high heat dissipation performance, so as to reduce the problem of large LED light attenuation caused by high node temperature in high-power LED street lamps. Thereby improving and extending the service life and effect of the LED light source.

Technical scheme of the present invention is as follows:

An LED street lamp with high heat dissipation performance, including an LED light source and its drive circuit, the LED light source and its drive circuit are fixed on an aluminum-based circuit board, characterized in that: the aluminum-based circuit board is directly fixed on a metal on the lamp housing.

The lamp housing is a trough-shaped cross-sectional structure, and the trough-shaped structure includes a bottom plate and side plates located on both sides of the bottom plate, wherein the two side plates form the sides of the street lamp housing, and the bottom plate serves as the bottom or top surface of the shell. The aluminum-based circuit board is directly fixed on the inner side of the base plate.

The middle part of the inner side of the bottom plate is a plane, and the aluminum-based circuit board is fixed on the plane; the middle part of the outer side of the bottom plate is provided with an arc-shaped groove along the longitudinal direction of the bottom plate, and the arc-shaped groove is fitted with an arc-shaped pressure plate. The lamp post of the street lamp can be inserted into the arc-shaped groove and fastened by the arc-shaped pressing plate.

The two sides of the arc-shaped groove are provided with T-shaped grooves for fastening the arc-shaped pressure plate with bolts, and the two sides of the arc-shaped pressure plate are correspondingly provided with fastening holes.

A heat dissipation channel is also provided on the outer surface of the bottom plate, and the heat dissipation channel is a groove structure arranged on both sides of the arc-shaped groove and longitudinally penetrating the bottom plate.

A plurality of cooling channels are arranged symmetrically on both sides of the outer surface of the floor.

Thermal conductive silicone grease is coated between the aluminum-based circuit board and the lamp housing.

The LED street lamp adopts modular light source distribution, that is, each street lamp can be composed of one or a group of LED light source modules connected in parallel, and each LED light source module is uniformly distributed on a metal base circuit board by a group of light emitting units. The light emitting unit includes at least one LED light emitting tube and its drive circuit.

The LED light emitting tube has a light diffusion angle greater than or equal to 110°.

Technical effect of the present invention is as follows:

At present, LED street lamps generally use a fixed frame inside the lamp housing to install and fix the LED circuit board. This installation structure will inevitably lead to a small space between the LED circuit board and the lamp housing. The heat dissipation is mainly based on the conduction of the circuit board through the air medium. The shell, and then the heat is conducted to the outside by the shell. Due to the poor thermal conductivity of the air, the heat dissipation efficiency of the existing LED street lamps is very low, which leads to the unfavorable situation of high node temperature of the LED light source and low service life.

The LED street lamp of the present invention completely overcomes the above-mentioned defects and deficiencies existing in the existing LED street lamps because the aluminum-based circuit board is directly fixed on the metal lamp housing. On the other hand, the heat energy generated by the LED light source accumulated on the aluminum-based circuit board can be quickly transferred to the outside space by using the metal lamp housing, thereby effectively reducing the operating temperature of the LED node and greatly improving the LED performance. The working life of the light source increases the service life of the street lamp accordingly, which is equivalent to reducing the application cost of the street lamp and improving the application effect of the LED light source. Under the situation of energy shortage, it adapts to the development trend of energy saving and consumption reduction, and has huge Promote value.

Secondly, the outer surface of the lamp housing is provided with an arc-shaped groove and an arc-shaped pressure plate. When installing, the street lamp pole can be directly inserted into the arc-shaped groove and fastened by the arc-shaped pressure plate, so the installation is very simple.

Furthermore, a number of heat dissipation channels are provided on the outer surface of the lamp housing, which can increase the heat dissipation surface area of the lamp housing and improve the heat dissipation efficiency.

In addition, the LED street lamp of the present invention adopts modular light source distribution. Each street lamp can be composed of one or more LED light source modules connected in parallel. The light emitting unit includes at least one LED light emitting tube and its driving circuit. This modular light source distribution method, first, can give street lamp managers a lot of room for adjustment. They can freely increase or delete LED light source modules in street lamps according to changes in environmental conditions, and increase or reduce the power of LED street lamps. Avoid insufficient brightness or waste of electric energy; second, this modular LED light source is composed of parallel connections, even if one of the LED light sources is damaged, it will not affect the use of the entire street lamp, which can improve the reliability of the street lamp; Third, this modular distribution of light sources can make the distribution of LED light sources more uniform, improve the heat dissipation of the circuit board, and reduce the operating temperature of the LED light source nodes.

Description of drawings

Accompanying drawing 1 shows the schematic cross-sectional view of street lamp housing of the present invention;

Accompanying drawing 2 shows the installation schematic diagram of LED street lamp of the present invention;

Figure 3 is a schematic diagram showing the distribution of the LED light source modules of the present invention.

Detailed ways

The present invention will be further described below in conjunction with accompanying drawing.

FIG. 1 is a schematic structural view of a lamp housing of an LED street lamp according to the present invention.

The housing 1 is a metal U-shaped groove structure. There are side plates 3 on both sides of the bottom plate 2, and a cavity is formed in the middle. The inner surface of the cavity can also be used as the emitting surface. The circuit board module is fixed on it (see accompanying drawing 3). In this embodiment, there are two bottom plates 2 arranged in parallel in the housing 1. Of course, according to the actual needs of street lamps, the bottom plates 2 can be arranged in a single row or in three rows. ,or more.

The LED circuit board is directly fixed on the metal shell 1, and the heat generated by the LED circuit board can be directly conducted out by using the metal shell with good thermal conductivity, which can effectively control the working temperature of the LED node, improve the service life of the light source and ensure the light source The brightness is stable for a long time.

Considering economy and processing performance, the housing 1 is preferably made of aluminum alloy.

The middle part of the outer surface of the bottom plate 2 of the housing 1 is longitudinally provided with a semicircular groove 6. The present invention arranges T-shaped grooves 7 longitudinally on both sides of the semicircular groove 6. When installing, only the light pole 9 needs to be inserted into the In the semicircular groove 6, the light pole 9 can be firmly fastened with the housing 1 by using the matching semicircular pressure plate 8 and fastening bolts. Since the installation position of the light pole 9 can be moved, it is convenient to adjust the position of the light body on the light pole. Fixed position on 9. The installation method of the present invention is simple and convenient, not only can reduce processing and installation costs, but also can greatly simplify the on-site construction and installation of street lamps, and reduce safety hazards caused by complicated installation when construction personnel operate at high altitudes.

The inner sides of the ends of the two side plates 3 are provided with grooves 4 facing each other. When in use, light-transmitting surfaces such as glass plates and sealing materials can be inserted into the grooves 4 to seal and isolate the inner cavity of the street lamp. In this embodiment, the inner side of the side plate 3 of the housing 1 is provided with a plurality of grooves at different positions, so as to select different positions for installing the light-transmitting plate of the lamp.

In practical applications, sealing covers 10 (as shown in FIG. 3 ) can be fitted on the two open ends of the housing 1 to reduce the intrusion of dust and mosquitoes and improve the light transmittance of the light source.

In order to further improve the heat dissipation capability of the housing 1, a number of heat dissipation passages 5 are also arranged on the outer surface of the bottom plate 2 of the housing 1. The heat dissipation passages 5 are groove structures arranged longitudinally along the housing. By arranging a large number of heat dissipation passages 5, it is possible to The heat dissipation surface area of the casing 1 is effectively increased, and the heat dissipation efficiency of the casing 1 is improved.

Experiments have proved that the use of the housing 1 of the present invention can significantly improve the heat dissipation effect of the circuit board, ensure that the working temperature of the LED light source node is below 60°C, and the working life of the LED light source is more than 50,000 hours.

As another feature of the LED street lamp of the present invention, the LED street lamp of the present invention adopts modular light source distribution. Each LED light source module 11 consists of a group of light emitting units evenly distributed on a metal base circuit board, and each light emitting unit includes at least one LED light emitting tube and its driving circuit. This modular light source distribution method, first, can give street lamp managers a lot of room for adjustment. They can freely increase or delete LED light source modules in street lamps according to changes in environmental conditions, and increase or reduce the power of LED street lamps. Avoid insufficient brightness or waste of electric energy; second, because the circuit composition of this modular LED light source is connected in parallel, even if one of the LED light sources is damaged, it will not affect the use of the entire street lamp, which can improve the reliability of the street lamp. Third, this modular light source distribution can make the distribution of LED light sources more uniform, improve the heat dissipation of the circuit board, and reduce the operating temperature of the LED light source nodes.

The light-emitting tube of the LED light source of the present invention adopts the LED light-emitting tube with a large diffusion angle, and its refraction angle is more than 110 degrees. Under the condition of not using a special optical lens, the illuminated area of the street lamp can be increased, and the luminous flux can be increased by 15%.

The above are only preferred embodiments of the present invention. It should be pointed out that for those skilled in the art, based on the spirit and essence of the present invention, other modifications and improvements can also be made, but these modifications and improvements will all fall within the protection scope of the present invention.

Claims (8)

1. A LED street lamp with high heat dissipation performance, comprising an LED light source and its drive circuit, the LED light source and its drive circuit are fixed on an aluminum-based circuit board, characterized in that: the aluminum-based circuit board is directly fixed on a metal The housing is made of a trough-shaped cross-section structure, the trough-shaped structure includes a bottom plate and side plates located on both sides of the bottom plate, a cavity is formed in the middle of the shell, and the inner surface of the cavity doubles as a heat dissipation surface. The inner bottom plate of the housing is arranged in parallel, and the inner bottom plate of the housing is single row or two rows or three rows or more. On the top surface, the aluminum-based circuit board is directly fixed on the inner surface of the bottom plate. 2. A LED street lamp with high heat dissipation performance according to claim 1, characterized in that: the middle part of the outer surface of the bottom plate is provided with an arc-shaped groove along the longitudinal direction of the bottom plate, and the arc-shaped groove is fitted with an arc-shaped pressure plate, The lamp post of the street lamp can be inserted into the arc-shaped groove and fastened by the arc-shaped pressing plate. 3. A LED street lamp with high heat dissipation performance as claimed in claim 2, characterized in that: the two sides of the arc-shaped groove are provided with T-shaped grooves for fastening the arc-shaped pressure plate with bolts, and the two sides of the arc-shaped pressure plate correspond to Fastening holes are provided. 4. The LED street lamp with high heat dissipation performance as claimed in claim 3, characterized in that: a heat dissipation channel is provided on the outer surface of the bottom plate, and the heat dissipation channel is an edge arranged on both sides of the arc-shaped groove. A groove structure that runs through the bottom plate longitudinally. 5 . The LED street lamp with high heat dissipation performance according to claim 4 , wherein a plurality of heat dissipation channels are arranged symmetrically on both sides of the outer surface of the base plate. 6 . 6. The LED street lamp with high heat dissipation performance according to claim 5, characterized in that: thermal conductive silicone grease is coated between the aluminum-based circuit board and the lamp housing. 7. A LED street lamp with high heat dissipation performance as claimed in claim 1, characterized in that: the LED street lamp adopts modular light source distribution, that is, each street lamp can be composed of one or a group of LED light source modules connected in parallel, and each LED Each light source module consists of a group of light emitting units uniformly distributed on a metal base circuit board, and each light emitting unit includes at least one LED light emitting tube and its driving circuit. 8. The LED street lamp with high heat dissipation performance according to claim 7, wherein the LED light emitting tube has a light diffusion angle greater than or equal to 110°.

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