TWI417480B - Led lamp - Google Patents

Description

LED lighting

The invention relates to an LED lighting fixture, in particular to an LED lighting fixture with a heat dissipation structure.

Compared with traditional light sources, light-emitting diodes (LEDs) have higher luminous efficiency (light source temperature is lower than general bulbs), low radiation, low power consumption, long life, low voltage, fast start-up, environmental protection, anti-seismic compression, Lighting fixtures can be miniaturized. Lighting devices using LEDs as light sources are currently used in a variety of lighting applications, such as indoor lighting, outdoor lighting, portable lighting (such as flashlights), and ambient lighting. The LED generates heat during operation, and the heat between the air with the heat and the air in the surrounding environment dissipates heat, but the heat dissipation method has limited effect, especially after the LED is used for a long time, the heat dissipation method alone cannot be used. The generated heat is evacuated in time, which causes the LED temperature to rise, which seriously affects the luminous efficiency of the LED and the service life of the LED lamp.

In order to solve the problem of heat dissipation of LED lamps, in the prior art, heat-dissipating fins are added to the lamp housing. Although this method effectively increases the heat dissipation area, it increases the volume and weight of the LED lamps, and the fin spacing is too small. It can cause dust impurities and the like to deposit in the fin gap, resulting in a decrease in heat dissipation capability.

In view of this, the present invention provides an LED lighting fixture that is lightweight and has good heat dissipation.

An LED lighting fixture includes a heat dissipation base, an LED substrate, a driving circuit board, and a power connector, and the LED substrate is provided with a plurality of light emitting diodes. One end of the heat dissipation base is connected to the power connector, the other end is fixed to the LED substrate, and the driving circuit board is received in the heat dissipation base; and the heat dissipation base sidewall is provided with a flow guiding hole.

When the LED lighting device is working, the air guiding hole formed on the side of the heat dissipating base forms an inner flow field inside the heat dissipating base, and the cold air enters from the diversion hole close to the power substrate, and is discharged from the diversion hole close to the power connector. The cold air entering the inside of the heat sink base can exchange heat between the inner side wall of the heat sink base and the drive circuit board.

100‧‧‧LED lighting

10‧‧‧shade

20‧‧‧heating base

21‧‧‧ first end

22‧‧‧ second end

23‧‧‧ recess

24‧‧‧ Heat sink fins

25‧‧‧Inlet

30‧‧‧Power connector

40‧‧‧LED substrate

41‧‧‧Lighting diode

42‧‧‧ screws

50‧‧‧Drive Module

51‧‧‧Drive Circuit Board

52‧‧‧Upper cover

53‧‧‧ Lower cover

54‧‧‧ screws

1 is a perspective view of an LED lighting fixture in accordance with an embodiment of the present invention.

2 is an exploded view of the LED lighting fixture of FIG. 1.

3 is a schematic structural view of a heat dissipation base of the LED lighting fixture of FIG. 1.

4 is a schematic structural view of a driving module of the LED lighting fixture of FIG. 1.

FIG. 5 is a schematic diagram of a heat dissipation mode of the LED lighting fixture of FIG. 1. FIG.

Referring to FIG. 1 , the LED lighting fixture 100 includes a lamp cover 10 , a heat dissipation base 20 , and a power connector 30 . The lamp cover 10 and the power connector 30 are respectively fixed to both ends of the heat dissipation base 20. The power connector 30 is used to connect to a power source, and the power connector 30 is a universal power interface such as a screw power connector or a bayonet power connector.

Referring to FIG. 2 , the LED lighting fixture 100 further includes an LED substrate 40 and a driving module 50 . A plurality of light emitting diodes 41 are also mounted on the LED substrate 40. The driving module 50 is electrically connected to the power connector 30 and the LED substrate 40, and the driving module 50 passes through the power connector. 30 Acquires electric energy from the outside to drive the light-emitting diode 41 to emit light.

The lamp cover 10 is fixed on the heat dissipation base 20, and the light emitted from the light-emitting diode 41 is emitted through the lamp cover 10 to the outside of the LED lighting device 100. The lampshade 10 can be fixed to the heat dissipation base 20 by a screw connection, a snap, an adhesive or the like. In the present embodiment, the lampshade 10 uses a transparent plastic as a substrate, and mixes light diffusion particles in an appropriate ratio therein to increase the light scattering effect and soften the light. In other embodiments, a rough surface may be provided on the inner surface of the lampshade 10 to increase the light diffusing scattering effect of the lampshade.

Referring to FIG. 3 together, in the present embodiment, the heat dissipation base 20 is a hollow cone-like body, and the cone is formed by opposing two symmetric semi-cones. The heat sink base 20 includes a first end portion 21 and a second end portion 22 having a diameter that is greater than a diameter of the second end portion 22. A recess 23 is formed in the first end portion 21 of the heat dissipation base 20, and the LED substrate 40 is fixed in the recess 23. In the present embodiment, the LED substrate 40 is fixed in the recess 23 by the screw 42. The second end 22 is fixed to the power connector 30. The outer surface of the heat dissipation base 20 is further provided with a plurality of heat dissipation fins 24 spaced apart from each other. The heat dissipation fins 24 are used to increase the surface area of the heat dissipation base 20, thereby increasing the contact area with the air, thereby improving the heat dissipation efficiency. . The side of the heat dissipation base 20 is further provided with a flow guiding hole 25. In the embodiment, the heat dissipation base 20 includes at least one row of flow guiding holes 25 distributed radially on the side of the heat dissipation base 20, the at least one column guide The number of the flow holes 25 in the flow holes 25 is at least two.

In the present embodiment, the heat dissipation base 20 is made of a heat dissipation material having good thermal conductivity, such as an aluminum alloy. Preferably, a heat conducting medium (not shown) is disposed between the LED substrate 40 and the first end portion 21 of the heat dissipation base 20 for uniformly conducting heat emitted by the LED substrate 40 to the heat dissipation base 20 during operation. . In the present embodiment, the LED substrate The thermally conductive medium between the 40 and the first end 21 of the heat sink base 20 is a thermally conductive tape.

Referring to FIG. 2 and FIG. 4 together, the driving module 50 is housed inside the heat dissipation base 20. The driving module 50 includes a driving circuit board 51, an upper cover body 52, and a lower cover body 53. The driving circuit board 51 is accommodated between the upper cover body 52 and the lower cover body 53. The upper cover 52 is locked to the lower cover 53 by screws 54. The upper cover 52 and the lower cover 53 can provide insulation and waterproof protection for the drive circuit board. The upper cover 52 and the lower cover 53 are each provided with an opening 55 through which a wire (not shown) is passed, thereby allowing the drive circuit board 51 to be electrically connected to the LED substrate 40 and the power connector 30.

Referring to FIG. 5 , when the LED lighting fixture 100 is in operation, the heat generated by the LEDs 41 is conducted to the first end portion 21 of the heat dissipation base 20 via the heat conductive medium, and then conducted to the heat dissipation fins 24 by the first end portion 21 . The heat sink fins 24 exchange heat with the air to dissipate heat. At the same time, the flow guiding hole 25 formed on the side of the heat dissipation base 20 forms an internal flow field inside the heat dissipation base 20, and the cold air enters from the flow guiding hole 25 near the first end portion 21, and the flow guiding hole from the second end portion 22 25 discharge. The cold air entering the heat dissipation base 20 can exchange heat with the inner side wall of the heat dissipation base 20 and the driving module 50, thereby effectively improving the heat dissipation efficiency.

It is to be understood by those skilled in the art that the above embodiments are only intended to illustrate the invention, and are not intended to limit the invention, as long as it is within the spirit of the invention Changes and modifications are intended to fall within the scope of the invention.

10‧‧‧shade

30‧‧‧Power connector

Claims (8)

An LED lighting fixture comprising a heat dissipation base, an LED substrate, a driving circuit board and a power connector, wherein the LED substrate is provided with a plurality of light emitting diodes, wherein the heat sink base comprises a diametrically opposite first end portion and a second end portion having a diameter larger than a diameter of the second end portion, the second end portion of the heat dissipation base being connected to the power connector, the first end portion being fixed to the LED substrate, and the driving circuit board being received in the second end portion The heat dissipation base has at least one row of flow guiding holes radially distributed on the side of the heat dissipation base. The LED lighting fixture of claim 1, wherein a heat conductive medium is disposed between the LED substrate and the heat dissipation base, and heat generated by the LED substrate is conducted to the heat dissipation base via the heat conductive medium. The LED lighting fixture of claim 2, wherein the heat conductive medium is one of a graphite heat conductive sheet, a thermal conductive tape or a ceramic heat conducting plate. The LED lighting fixture of claim 1, further comprising a lamp cover, the lamp cover being fixed on the heat dissipation base, and the light emitted by the light emitting diode is emitted through the lamp cover to the outside of the LED lighting fixture. The LED lighting fixture of claim 4, wherein the lampshade is made of a transparent plastic mixed with light-diffusing particles. The LED lighting fixture of claim 4, wherein the lamp cover surface is attached with a light diffusing film. The LED lighting fixture of claim 1, wherein the heat dissipating base side is provided with a plurality of fins spaced apart from each other by a certain distance. The LED lighting fixture of claim 1, wherein the number of the guide holes in each of the at least one column of the flow guiding holes is at least two.