What is the function of copper-coated PCB?

PCB circuit board in all kinds of electrical appliances and instruments can be seen everywhere, the reliability of circuit board is an important guarantee to ensure the normal operation of various functions, but in many circuit boards we often see a lot of large area of copper coating, design circuit board with large area of copper coating.
In general there are two kinds of large copper clad, one kind is to heat dissipation, due to the increasing power circuit current is too large, so in addition to add the necessary cooling elements, such as heat sinks, cooling fan, etc., but for some circuit board but these are not enough, if simply heat dissipation effect, at the same time in the increase of the area of the copper foil to help increase welding layer, And add tin to enhance heat dissipation.
Worthy of note that because of the large copper clad in long-term heat wave or PCB, the PCB with a lower degree of copper foil adhesive, gradually accumulated inside the escaping gas can’t go out, because of the heat bilges cold shrink effect, can make the copper foil and falls off phenomenon, so if the copper clad area is very big to consider whether there is this kind of problem, Especially when the temperature is relatively high, it can be windowed or designed as a grid network.

Another is to enhance anti-jamming circuit, due to the large copper can decrease the impedance of the ground, can reduce the mutual interference shielding signal, especially for some high speed PCB, in addition to the bold grounding line as far as possible, circuit board above the necessary spare parts should be grounded, namely “ground”, so that we can effectively reduce the parasitic inductance, at the same time, Large area grounding can effectively reduce noise radiation, etc. For example, for some touch chip circuits, the floor line is spread all around each key, which reduces the anti-interference ability