PCB News - Knowledge about PCB copper

PCB copper pour knowledge sharing, copper pour is a common operation, it is to cover the area of the circuit board without wiring with copper film. This can enhance the anti-interference performance of the circuit board. The so-called copper pour is to use the unused space on the PCB as a reference surface and then fill it with solid copper. These copper areas are also called copper pour. Copper coating can reduce ground wire impedance and improve anti-interference ability; reduce voltage drop and improve power supply efficiency; in addition, connect to ground wire to reduce loop area.

1. There are several issues that need to be dealt with in copper coating:

1. Single-point connection of different grounds: The method is to connect through 0 ohm resistors or magnetic beads or inductance.

2. Copper-clad near the crystal oscillator, the crystal oscillator in the circuit is a high-frequency emission source: the method is to coat copper around the crystal oscillator, and then ground the shell of the crystal oscillator separately.

3. Dead zone problem: If you think it is too big, it will not cost much to define a ground via and add it in.

2. What are the benefits of copper coating?

Improve power efficiency, reduce high-frequency PCB interference, and the other is that it looks beautiful!

Is it better for large area copper pour or grid copper pour?

cannot be generalized. why? If the copper is covered with a large area, if the wave soldering is used, the board may be uplifted or even blistered. From this point of view, the heat dissipation of the grid is better. Usually it is a multi-purpose grid with high anti-interference requirements for high-frequency circuits, and circuits with large currents in low-frequency circuits are commonly used with complete copper.

When starting wiring, the ground wire should be treated the same. When wiring, the ground wire should be routed well. You can't rely on adding vias after copper plating to eliminate the ground pins for the connection. This effect is very bad. Of course, if the grid copper is used, these ground connections will affect the appearance. If you are careful, delete it.

Copper filling is intelligent. This operation will actively judge the network properties of the vias and pads in the copper filling area, which absolutely conforms to the safety distance you set. This is different from drawing copper skin, and there is no drawing copper skin. This feature.

There are many functions of copper filling. Filling the back of the double-sided board with copper and connecting it to the ground can reduce interference, increase the laying range of the ground wire, reduce low impedance, and so on. Therefore, after the wiring of the PCB board is basically completed, it is often necessary to fill it. copper.

The above is an introduction to the knowledge about PCB copper coating. Ipcb also provides PCB manufacturers and PCB manufacturing technology.