TWI393837B - Led illuminating apparatus - Google Patents

Description

Light-emitting diode lighting device

The invention relates to a light-emitting diode lighting device.

At present, Light Emitting Diode (LED) has been widely used in many fields, especially in street lamps. Here, a novel light-emitting diode can be found in Daniel A. Steigerwald et al., IEEE Journal on Selected Topics in Quantum Electronics, Vol. 8, No. 2, March/April 2002, Illumination With Solid State Lighting Technology. .

Since the temperature of the light-emitting diode is gradually increased when the light-emitting diode is illuminated, the working voltage, the wavelength of the light, and the intensity of the light output are greatly affected when the temperature reaches a certain level. In the continuous operation of the lighting device, if the heat generated by the light-emitting diode cannot be dissipated in time, the components such as the light-emitting diode may be damaged, so that the lighting device cannot operate normally. In order to avoid this situation, it is necessary to provide a heat dissipating component to the light emitting diode, such as a heat dissipating fan, a heat pipe, etc. Since the heat dissipating fan has low heat dissipation efficiency, a heat pipe is often used as the heat dissipating component, however, the heat pipe is used as a heat sink. In the illuminating device of the heat dissipating component, the heat pipe is generally disposed in parallel with the plane of the light emitting diode, that is, the heat receiving end and the condensing end of the heat pipe are in the same plane and the plane is parallel to the plane of the light emitting diode, so that the heat pipe The heat dissipation efficiency of the heat pipe is not high.

A light-emitting diode lighting device with high heat dissipation efficiency will be described below by way of example.

A light-emitting diode lighting device includes: a lamp cover, a light-emitting module and a heat-dissipating module. The light cover includes a heat dissipation housing and a light exiting portion. The light emitting module is disposed in the heat dissipation housing and opposite to the light emitting portion. The light emitting module includes a plurality of light emitting diodes, and the light emitted by the plurality of light emitting diodes is The heat emitting module is disposed in the heat dissipation housing and located on a side of the light emitting module away from the light emitting portion, the heat dissipation module includes a plurality of heat pipes, and the evaporation ends of the plurality of heat pipes and the plurality The light emitting diodes are thermally connected, and the condensation end thereof is thermally connected to the heat dissipation housing.

Compared with the prior art, the evaporation end of the plurality of heat pipes in the light-emitting diode lighting device is thermally connected to the plurality of light-emitting diodes, and the heat generated by the plurality of light-emitting diodes can be quickly transmitted to the heat pipe, and the plurality of heat-emitting diodes are quickly transferred to the heat pipe. The condensing end of the heat pipe is thermally connected to the heat dissipating casing, and the heat can be transferred to the air in time, so that the illuminating diode lighting device can effectively improve the heat dissipating efficiency, and the heat dissipating module in the illuminating diode illuminating device The light-emitting diode is located on one side of the light-emitting diode, and does not block or absorb the light emitted by the light-emitting diode, thereby avoiding light loss caused by the heat-dissipating module.

The embodiments of the present invention will be further described in detail below with reference to the accompanying drawings.

Referring to FIG. 1 , an embodiment of the present invention provides a light-emitting diode lighting device 100 with high heat dissipation efficiency, comprising: a lampshade 10 and a lamp cover 10 The light emitting module 20 and a heat dissipation module 30.

The lamp cover 10 includes a heat dissipation housing 11 , a light exit portion 13 , and a diffusion plate 12 disposed on the light exit portion 13 . The light exit portion 13 can be an opening, as shown in FIG. 1, or can be made of a transparent material.

The light-emitting module 20 is disposed in the heat-dissipating housing 11 and opposite to the light-emitting portion 13 . The light-emitting module 20 includes a reflector 22 and a plurality of LEDs 21 disposed on the inner surface of the reflector 22 . The plurality of light emitting diodes 21 are arranged in an array, for example, a matrix or a linear array.

The heat dissipation module 30 is disposed in the heat dissipation housing 11 and located on a side of the light emitting module 20 away from the light exit portion 13 . The heat dissipation module 30 includes a first heat conduction plate 32, a second heat conduction plate 33, and a plurality of heat pipes 31. The plurality of light-emitting diodes 21 are remote from one side of the light-emitting portion 13 and are thermally connected to the first heat-conducting plate 32. The second heat-conducting plate 33 is fixed to the heat-dissipating casing 11. The evaporation end 311 of the plurality of heat pipes 31 is fixed to one side of the first heat conducting plate 32 away from the plurality of light emitting diodes 21, and the condensation end 312 of the plurality of heat pipes 31 passes through the second heat conducting plate 33 and the heat radiating shell Body 11 is thermally connected. The plurality of heat pipes 31 are parallel to each other and spaced apart from each other, and are in one-to-one correspondence with the plurality of light-emitting diodes 21, and the length direction of the plurality of heat pipes 31 and the normal vector direction of the plane in which the plurality of light-emitting diodes 21 are located M parallel.

The reflector 22 reflects the light emitted from the light-emitting diode 21 and incident thereon to the diffusing plate 12, and the diffusing plate 12 equalizes the light and emits the light from the light-emitting portion 13. The arrangement of the reflector 22 reduces light loss and improves light utilization efficiency.

In the general case, the complex light-emitting diode 21 has an electro-optical conversion efficiency of about 40%, the remaining 60% of the electrical energy is converted into heat. The heat generated by the operation of the plurality of LEDs 21 is transmitted to the first heat conducting plate 32 via the reflector 22, thereby preventing a large amount of heat from being accumulated in the reflector 22, causing the temperature to be too high to affect the plurality of LEDs. The polar body 21 works normally. The first heat conducting plate 32 can be a metal plate such as a copper plate having good thermal conductivity, and the absorbed heat is quickly transmitted to the evaporation end 311 of the plurality of heat pipes 31 thermally connected to the first heat conducting plate 32.

Referring to FIG. 2, the working fluid of the plurality of heat pipes 31 changes into a gaseous state by absorbing heat in the evaporation end 311, and the gaseous working fluid reaches the condensing end 312 to release the absorbed heat and is converted into a liquid state, and then passes through the capillary structure layer 313. It flows back to the evaporation end 311. The condensing end 312 is thermally connected to the second heat conducting plate 33. The second heat conducting plate 32 is a metal plate such as a copper plate having good thermal conductivity, and is thermally connected to the heat dissipating casing 11, and the heat dissipating casing 11 and the air are naturally The convection is performed, so that the heat generated by the illuminating diode device 100 during operation and transmitted by the condensing end 312 is transmitted to the outside to achieve the purpose of heat dissipation.

In summary, the present invention has indeed met the requirements of the invention patent, and has filed a patent application according to law. However, the above description is only a preferred embodiment of the present invention, and the scope of the patent application of the present invention cannot be limited thereto. Equivalent modifications or variations made by those skilled in the art in light of the spirit of the invention are intended to be included within the scope of the following claims.

100‧‧‧Lighting diode lighting device

10‧‧‧shade

20‧‧‧Lighting module

30‧‧‧ Thermal Module

11‧‧‧ Thermal housing

13‧‧‧Lighting Department

12‧‧‧Diffuser

22‧‧‧reflector

21‧‧‧Lighting diode

32‧‧‧heat conducting plate

33‧‧‧Second heat conducting plate

31‧‧‧ heat pipe

311‧‧‧Evaporation end

312‧‧‧ Condensed end

313‧‧‧Capillary structure

1 is a schematic cross-sectional view of a light-emitting diode lighting device according to an embodiment of the present invention; and FIG. 2 is a schematic view showing the working principle of the heat pipe shown in FIG.

100‧‧‧Lighting diode lighting device

10‧‧‧shade

20‧‧‧Lighting module

30‧‧‧ Thermal Module

11‧‧‧ Thermal housing

13‧‧‧Lighting Department

12‧‧‧Diffuser

22‧‧‧reflector

21‧‧‧Lighting diode

32‧‧‧First heat conducting plate

33‧‧‧Second heat conducting plate

31‧‧‧ heat pipe

311‧‧‧Evaporation end

312‧‧‧ Condensed end

Claims (9)

A light-emitting diode lighting device includes: a light cover, a light-emitting module and a heat-dissipating module, wherein: the light cover comprises a heat-dissipating housing and a light-emitting portion; the light-emitting module is disposed in the heat-dissipating housing and The light emitting module includes a plurality of light emitting diodes, and the light emitted by the plurality of light emitting diodes is emitted through the light emitting portion; and the heat dissipating module is disposed in the heat dissipating housing and located in the light emitting module The heat dissipation module includes a first heat conducting plate and a plurality of heat pipes, and the side of the plurality of light emitting diodes away from the light emitting portion is thermally connected to the first heat conducting plate. The evaporation ends of the plurality of heat pipes are fixed on the first heat conducting plate and are thermally connected to the plurality of light emitting diodes, and the condensation end thereof is thermally connected to the heat dissipation case. The light-emitting diode lighting device of claim 1, wherein the light-emitting portion is provided with a diffusing plate for homogenizing the light emitted by the plurality of light-emitting diodes. The illuminating diode module of claim 1, wherein the illuminating module further comprises a reflector for emitting the plurality of illuminating diodes and incident thereon Light is reflected to the light exit portion to be emitted. The illuminating diode illuminating device of claim 1, wherein the first heat conducting plate is a copper plate. The illuminating diode illuminating device of claim 1, wherein the heat dissipating module further comprises a second heat conducting plate, the second heat conducting plate is fixed on the heat dissipating casing, and the plurality of heat pipes are condensed. End via the second heat conduction The board is thermally coupled to the heat sink housing. The illuminating diode illuminating device of claim 5, wherein the second heat conducting plate is a copper plate. The illuminating diode illuminating device of claim 1, wherein the plurality of heat pipes are in one-to-one correspondence with the plurality of illuminating diodes. The illuminating diode illuminating device of claim 7, wherein the plurality of heat pipes are parallel and spaced apart from each other. The illuminating diode illuminating device of claim 1, wherein a length direction of each of the plurality of heat pipes is parallel to a normal vector direction of a plane in which the plurality of light emitting diodes are located.