PCB circuit boards can be seen everywhere in various applications of electrical appliances and instruments. The reliability of circuit boards is an important guarantee to ensure the normal operation of various functions. However, on many circuit boards, we often see that many are large areas of copper, designing circuit boards. Large areas of copper are used.
Generally speaking, large area copper has two functions. One is for heat dissipation. Due to the excessive current of the circuit board, the power rises. Therefore, in addition to adding the necessary heat dissipation components, such as heat sinks, heat dissipation fans, etc., but for some circuit boards, It is not enough to rely on these. If it is pure heat dissipation, it is necessary to increase the soldering layer while increasing the copper foil area, and add tin to enhance heat dissipation.
It is worth noting that, due to the large area of copper, over-peak or long-term heating of the PCB, the adhesion between the PCB and the copper foil is reduced, and the volatile gas accumulated in it cannot be discharged over time. Due to the effect of thermal expansion and contraction, it will The copper foil expands and falls off, so if the copper area is very large, you should consider whether there is such a problem, especially when the temperature is relatively high, you can open it or design it as a grid network.
The other is to enhance the anti-interference ability of the circuit. Due to the large area of copper plating, the impedance of the ground wire can be reduced, and the signal can be shielded to reduce mutual interference. Especially for some high-speed PCB boards, in addition to thickening the ground wire as much as possible, the circuit board is necessary. Ground all free places, that is, “full ground”, which can effectively reduce parasitic inductance, and at the same time, a large area of ground can effectively reduce noise radiation. For example, for some touch chip circuits, each button is covered with a ground wire, which reduces the anti-interference ability.