The difference between copper base PCB, fake double-sided copper base PCB and true double-sided copper base PCB

Copper base PCB is the best heat dissipation and the most expensive circuit board among metal-based PCBs. Generally, copper base PCB include single-sided copper PCB, double-sided copper base PCB, and fake double-sided copper base PCB. The specific advantages of copper base PCB make them widely used in areas with large changes in high and low temperatures, as well as in the precision communication equipment and LED car light markets. The pad production processes of copper substrate manufacturers generally include immersion gold, OSP, HASL, immersion silver, etc.

Authenticity of true and false double-sided copper base PCB

Fake double-sided copper base PCB are generally designed by customers with two layers of circuits, but they are not connected to each other. The real double-sided copper base PCB is the double-sided circuit layer designed by the customer with vias connecting the two-sided circuits.

The copper base PCB, circuit layer requires a large current carrying capacity, so a thicker copper foil should be used, with a thickness of generally 35μm~280μm; the thermal conductive insulation layer is the core technology of the copper substrate. The core thermal conductive component is composed of aluminum oxide and silicon powder and a polymer filled with epoxy resin. It has a small thermal resistance (0.15), excellent viscoelastic properties, and is resistant to thermal aging and can withstand mechanical and thermal stress.

The copper substrate metal base is the supporting component of the copper substrate. It is required to have high thermal conductivity. It is generally a copper plate. Copper plates can also be used (copper plates can provide better thermal conductivity). It is suitable for conventional mechanical processing such as drilling, punching and cutting.

The structure of the real and fake double-sided copper substrate can be divided into 5 layers: 1 layer is the top copper foil, 2 layers are thermal conductive insulation materials, 3 layers are aluminum plates, 4 layers are bottom insulation materials, and 5 layers are bottom copper foil. Their functions are as follows:

The 1st layer of copper foil is used as the top circuit pattern (conductive).

The 2nd insulating layer is also the key layer to reflect the thermal conductivity, also known as the thermal conductive layer, which plays a dual role of thermal conductivity and insulation. Whether the heat generated by the LED lamp can be quickly transferred to the aluminum plate, it is necessary to know the thermal resistance of the thermal conductive insulating material.

The function of the 3rd layer is to transfer the heat conducted by the thermal conductive insulating material to the lamp cup again. There is also an installation function.

The functions of the 4th and 5th layers are the same as those of the 2nd and 1st layers above.

Through the above structure, we can easily understand the thermal conductivity and heat dissipation principle of the copper base PCB. In addition, the special process of copper base PCB processing and the thermoelectric separation production technology have improved the thermal conductivity of the copper base PCB by several times. Therefore, most designers who make LED copper base PCB now design a thermoelectric separation thermal conductivity method to make the heat dissipation performance of the copper base PCB better.

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