Fill means to draw a solid copper sheet to connect all the wires and vias in the region together, regardless of whether they belong to the same network. If there are VCC and GND networks in the drawn area, using the fill command will connect the elements of the two networks together, which may cause a short circuit.
Polygon pour: cut the copper pouring area. For example, if you need to optimize or reduce the copper pouring area, you can use line to divide the reduced area into two copper pouring areas, and delete the unnecessary copper pouring areas directly.
Polygon pour copper: build a copper digging area in the copper pouring area. For example, some important networks or components need to be hollowed out, such as the common RF signal, which usually needs to be hollowed out. And the RJ45 area under the transformer.
Polygon pour: pouring copper. Its function is similar to that of fill, and it is also used to draw a large area of copper sheet; But the difference lies in the word “pouring”. Copper pouring has unique intelligence, and it will actively distinguish the network of vias and solder joints in the copper pouring area. If vias and solder joints belong to the same network, copper pouring will connect vias, solder joints and copper sheet according to the set rules. On the contrary, a safe distance will be kept between the copper sheet and the via and solder joint. The intelligence of copper pouring is also reflected in its ability to automatically delete dead copper.
To sum up, fill can cause short circuit, so why use it?
Even though fill has its shortcomings, it also has its use environment. For example, when there are high current power supply chips such as lm7805 and amc2576, if a large area of copper sheet is needed to heat the chip, there can only be one network on this copper sheet, and it is just right to use the fill command.
Therefore, the fill command is often used in the early stage of circuit board design. After the layout is completed, use fill to draw all the special areas, so as to avoid making mistakes in the subsequent design.
In short, in the circuit board design process, the two tools are used together.
Plane: plane layer (negative), suitable for the whole board with only one power supply or ground network. If there are multiple power supply or ground networks, you can use line to draw a closed box in a certain power supply or area, and then double-click the closed box to assign the corresponding power supply or ground network to this area. It can reduce a lot of engineering data than add layer, and the computer’s reaction speed is faster in processing high-speed PCB. In the process of revision or modification, we can deeply realize the benefits of plane.
Method 1: select the copper sheet to be trimmed, and the shortcut key m + G can adjust the shape of the copper sheet at will.
Method 2: when repairing copper, you can use plane [shortcut key p + y] to repair obtuse angle.