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As we all know, the heat dissipation issue of LEDs is the biggest concern for LED strips manufacturers. In order to solve this problem, the aluminum substrate can be used because aluminum has a high thermal conductivity and good heat dissipation, helping LEDs effectively dissipate the heat. The aluminum PCB is a special metal-based copper clad laminate with good thermal conductivity, electrical insulation properties, and machinability. The PCB should also be placed close to the aluminum base as much as possible to reduce the thermal resistance generated by the potting compound.
The aluminum substrate uses surface mount technology (SMT) and a special circuit design scheme to increase thermal diffusion, reduce operating temperature, increase product power density and reliability, and extend product life. Moreover, the LED light bar using the aluminum substrate is smaller in size, lower in hardware and assembly cost, and better in mechanical durability than the traditional ceramic substrate.
The aluminum-based copper clad laminate is a metal circuit board composed of the copper foil, the thermally conductive insulating layer, and the metal substrate, and its structure is divided into three layers as below.
1. Circuit layer: The circuit layer, i.e. copper foil is usually etched to form a printed circuit so that the various components are connected to each other. In general, the circuit layer is required to have a large current carrying capacity, so that a thick copper foil should be used, and the thickness is generally 35μm to 280μm.
2. Insulation layer: The thermal conductive insulation layer is the core technology of the aluminum substrate. It has small thermal resistance, excellent viscoelasticity, heat aging resistance, and can withstand mechanical and thermal stress.
3. Base Layer: The metal base layer is a supporting member of the aluminum substrate, which is required to have high thermal conductivity. Generally used aluminum or copper (the copper can provide better thermal conductivity), suitable for conventional machinings such as drilling, punching, and cutting.
The aluminum PCB has excellent heat dissipation, good insulation, and mechanical properties. At present, because of the excellent performance of the aluminum substrate, it has become the most common substrate in the production of rigid LED strip lights.
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