source:Industry News release time:2022-09-14 Article author:yu Popular:pcb
Copper cladding is an important part of PCB circuit board design. The so-called copper cladding is to use the idle space on the PCB as a reference plane and fill it with solid copper. These copper areas are also called copper pouring.
The significance of copper cladding is to reduce the impedance of the ground wire and improve the anti-interference ability; reduce the voltage drop and improve the power efficiency; connect with the ground wire to reduce the loop area. Also for the purpose of keeping the PCB from being deformed as much as possible during soldering, most PCB manufacturers also require PCB circuit board designers to fill copper or grid-like ground wires in the open area of the PCB circuit board.
We all know that in the case of high frequency, the distributed capacitance of the wiring on the printed circuit board will play a role. When the length is greater than 1/20 of the corresponding wavelength of the noise frequency, an antenna effect will occur, and the noise will be emitted through the wiring. . If there is a poorly grounded copper pour in the PCB, the copper pour becomes a tool for spreading noise.
Therefore, in high-frequency circuits, don't think that the ground wire is grounded somewhere, this is the "ground wire". Be sure to punch vias in the wiring at a spacing of less than λ/20 to be "well grounded" to the ground plane of the multilayer board. If the copper cladding is handled properly, the copper cladding not only increases the current, but also plays a dual role of shielding interference.
There are generally two basic ways of copper cladding, that is, large-area copper cladding and grid copper. People often ask whether large-area copper cladding is better or grid copper cladding is better. This is not a good generalization!
Large-area copper cladding has the dual functions of increasing current and shielding, but large-area copper cladding may cause the board to warp or even blister if it is subjected to wave soldering. Therefore, when a large area is covered with copper, several slots are generally opened to alleviate the blistering of the copper foil. WeChat public account: Shenzhen LED Chamber of Commerce
Simple grid copper cladding is mainly for shielding, and the effect of increasing the current is reduced. From the perspective of heat dissipation, the grid is good (it reduces the heating surface of copper) and plays a certain role in electromagnetic shielding.
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