Copper plating is an important part of PCB circuit board design. The so-called copper pouring is to use the idle space on the PCB as a reference plane, and then fill it with solid copper. The significance of copper coating is to reduce the impedance of the ground wire and improve the anti-interference ability; to reduce the voltage drop and improve the power supply efficiency; to connect to the ground wire can also reduce the loop area. Next, let professional engineers take you to understand how to apply copper on PCB circuit boards?
There are generally two basic ways to apply copper to PCB circuit boards, namely, large-area copper application and grid copper.
1. Large-area copper coating has the dual functions of increasing current and shielding. However, if there is a large area of copper pouring, the board may warp or even bubble if it is subjected to wave soldering. Therefore, for large-area copper plating, several slots are generally opened to relieve copper foil blistering.
2. The simple mesh copper coating mainly plays a shielding role, and the effect of increasing the current is reduced. From the perspective of heat dissipation, grid copper not only reduces the heating surface of copper, but also plays a certain role in electromagnetic shielding. But it should be pointed out that the grid is composed of traces in staggered directions. We all know that for the circuit, the width of the trace has its corresponding "electrical length" for the operating frequency of the PCB circuit board; when the operating frequency is not very high, or the role of the grid line is not obvious, Once the electrical length matches the working frequency, there will be a big problem that the circuit cannot work normally at all, and signals that interfere with the working of the system will be emitted everywhere. Therefore, for engineers who like to use grid copper, it is recommended to choose according to the working condition of the circuit board. Therefore, for high-frequency circuits with high anti-interference requirements, it is better to use grid-count copper; and for low-frequency circuits with high-current circuits, it is better to use complete large-area copper.
