Aluminum base board is a kind of metal clad plate with good heat dissipation function. Generally, a single panel consists of three layers, namely, circuit layer (copper foil), insulation layer and metal base layer.
Common in LED lighting products. There are two sides, the white side is the welding LED pin, and the other side is the color of aluminum, which will contact with the thermal conductivity after applying thermal coagulation. There are currently ceramic base board and so on.
LED aluminum base board is PCB, is also the meaning of printed circuit board, just the material of circuit board is aluminum alloy, before our general circuit board material is glass fiber, but because the LED heat is larger, so the circuit board of LED lamps is generally aluminum base board, can conduct heat quickly, other equipment or electrical circuit board or glass fiber board!
Working principle of aluminum base board
The surface of the power device is mounted on the circuit layer. The heat generated during the operation of the device is quickly transferred through the insulation layer to the metal base, and then the metal base will transfer the heat, so as to realize the heat dissipation of the device.
Compared with the traditional fr-4, aluminum base board can reduce the thermal resistance to the minimum, so that the aluminum base board has excellent thermal conductivity; Compared with thick film ceramic circuit, its mechanical properties are very good. In addition, aluminum base baord has the following unique advantages: meet RoHs requirements. More suitable for SMT process.
In the circuit design scheme, the heat diffusion is processed very effectively, so as to reduce the operating temperature of the module, extend the service life, and improve the power density and reliability. Reduce the assembly of radiators and other hardware (including thermal interface materials), reduce the volume of products, reduce the hardware and assembly costs. The optimization combination of power circuit and control circuit. Replace brittle ceramic base board for better mechanical durability.
Aluminum base board structure composition
1. Line layer
The circuit layer (usually electrolytic copper foil) is etched to form a printed circuit for assembly and connection of devices. With the same thickness and line width, aluminum base board can carry higher currents than traditional fr-4.
2. Insulation layer
Insulation layer is the core technology of aluminum base board, mainly used for bonding, insulation and heat conduction. Aluminum base board insulation layer is the largest thermal conductivity barrier in the power module structure. The better the heat conduction performance of the insulation layer is, the more beneficial it is to the diffusion of heat generated during the operation of the device, and the more beneficial it is to reduce the operating temperature of the device, so as to increase the power load of the module, reduce the volume, extend the life and improve the power output.
3. Metal base
The type of metal used for insulating metal substrates depends on the thermal expansion coefficient, thermal conductivity, strength, hardness, weight, surface condition and cost of the metal substrates.
Generally, considering the cost and technical performance, aluminum base board is an ideal choice. There are 6061, 5052, 1060 and so on. If there are higher thermal conductivity, mechanical properties, electrical properties and other special performance requirements, copper base board, stainless steel plate, iron base board and silicon steel plate can also be used.
We are committed to being a high quality PCB manufacturer and service provider.
Post time: Sep-26-2019