High-power LED multi-hole phase-changing heat sink structure

Abstract

A high-power LED multi-hole phase-changing heat sink structure comprises a radiator inner cavity. A plurality of radiator fins are arranged on the top face of the radiator inner cavity. A metal multi-hole structure is arranged in the radiator inner cavity in a sintering mode. Holes of the metal multi-hole structure are filled with phase-changing materials. An LED electronic chip is arranged on the bottom face of the radiator inner cavity. The melting point of the phase-changing materials is lower than the normal working temperature of the LED electronic chip. The response speed of phase-changing latent heat storing can be increased, the weight and the cost of an LED radiating structure are lowered, a part of heat emitted by the chip during LED working is dissipated in a natural-convection mode, a large part is stored by latent heat absorbed during a phase-changing material melting process, meanwhile, the temperature of the LED chip is controlled through the melting point of the phase-changing materials, and radiating performance is improved. The high-power LED multi-hole phase-changing heat sink structure has the advantages of being simple in structure, light in weight, small in size, good in adjusting performance, good in radiating effect, long in service life, free from external energy loss and environment pollution and the like.

Description

technical field [0001] The invention relates to the lighting field, in particular to a high-power LED porous phase-change heat sink structure. technical background [0002] In recent years, with the shortage of energy supply, semiconductor light-emitting diode (Light Emitting Diode) lighting has been widely valued by countries all over the world. Because of its advantages of high luminous efficiency, long life, safety and environmental protection, it is called the fourth generation Lighting source or green light source, LED lighting has been widely used in special-purpose lighting systems such as mobile phone flashlights, display backlights, signs and signal lights, and miner's lamps. In view of the advantages of LEDs, it will be used in household lighting, car headlights, stage lighting and High-power lighting fields such as construction site lighting show great potential and prospects. However, although the brightness of high-power LED lights is higher, the heat generated...

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Problems solved by technology

Patent CN2735548 discloses a cooling box packaged with silicon oil and a disturbance system is designed in the box to reduce the temperature of the LED chip. The disadvantage is that the disturbance system requires additional energy consumption and poor reliability.

Patent CN1828956A discloses a high-power LED heat-dissipating package. Its principle is to use the heat pipe of the phase change boiling heat transfer method to dissipate heat to the environment. LED devices that are greatly affected by the ambient temperature of the terminal and are not suitable for the structure of the light array

Patent CN101315927A discloses a high-power LED phase-change heat sink structure. The principle is to use the liquid-gas phase change of the working medium to realize the thermal isothermal effect of the heat sink body to reduce the temperature of the LED chip. The disadvantage is that the heat transfer capacity depends on the phase change. Encapsulation of variable materials

Patent WO2009110987A1 discloses a heat storage system using phase-change materials for LED lamps. Its structure is to replace the traditional metal heat sink with a heat sink with a cavity. When the change material melts, it absorbs heat to store energy to reduce the temperature of the LED chip. The disadvantage is that the thermal conductivity of the phase change material is low and the heat transfer capacity is limited.

Patent US20090322229A1 discloses a new type of LED lighting device. Its principle is to reduce the temperature of the LED chip by transferring the heat of the LED chip to the phase-change material buried in the ground through a heat pipe. The disadvantage is that the cost of this structure is high. Occasions are limited, not conducive to promotion

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