At present, one of the biggest technical problems of LED lamps is heat dissipation. Poor heat dissipation has become the cause of premature aging of LED light sources and restricting the further development of driving power. Only by dissipating heat as soon as possible can the cavity temperature in the LED lamp be effectively reduced, and the power supply can be protected from working in a long-lasting high temperature environment, and the premature aging of the LED light source due to long-term high temperature operation can be avoided.

Because the LED light source itself does not have infrared or ultraviolet rays, the LED light source itself has no radiation heat dissipation function. The heat dissipation method of the LED lamp can only export heat through the radiator closely combined with the LED lamp bead plate. The radiator must have the functions of heat conduction, heat convection, and heat radiation.

For any radiator, in addition to quickly transferring heat from the heating source to the surface of the radiator, the most important thing is to dissipate heat into the air by convection and radiation. Heat conduction only solves the way of heat transfer, and thermal convection is the main function of the radiator. The heat dissipation performance is mainly determined by the heat dissipation area, shape, and the ability of natural convection intensity. Thermal radiation is only an auxiliary function. Generally speaking, if the distance from the heat source to the surface of the radiator is less than 5mm, as long as the thermal conductivity of the material is greater than 5, the heat can be exported, and the rest of the heat dissipation must be dominated by thermal convection.

Most LED lighting sources still use low-voltage (VF=3.2V) and high-current (IF=200-700mA) LED lamp beads. Due to the high heat during operation, aluminum alloys with higher thermal conductivity must be used. Usually there are die-cast aluminum radiators, extruded aluminum radiators, and stamped aluminum radiators.

Die-cast aluminum radiator

Die-casting aluminum radiator is a technology of pressure casting parts. The liquid zinc, copper, and aluminum alloy is poured into the inlet of the die-casting machine, and the die-casting machine is die-casted to cast a radiator with a pre-designed mold. The heat dissipation wing cannot be made thin, and it is difficult to maximize the heat dissipation area.

Extruded aluminum radiator

Extruded aluminum radiator is a radiator in which liquid aluminum is extruded through a fixed die, and then a bar is cut into the required shape by machining. The radiating wing can be made many and thin, and the heat dissipation area can be expanded to the greatest extent. When the radiating wing is working, air convection is automatically formed to diffuse heat, and the heat dissipation effect is better.

Stamped aluminum radiator

The stamped aluminum radiator presses and pulls the steel and aluminum alloy plates through a punch and die to make it into a cup-shaped radiator. The inner and outer periphery of the stamped and formed radiator is smooth, and the heat dissipation area is limited due to no wings.

Dongguan Zhigao Industrial Co., Ltd. specializes in processing aluminum automotive power amplifier radiators, aluminum home audio radiators and aluminum LED radiators. Welcome to order.