source:Other information release time:2023-03-14 Hits: Popular:PCB Assembly company
The so -called copper covering is to use the idle space on the flexible circuit board as the benchmark surface, and then fill it with solid copper. These copper areas are also called irrigation copper. The significance of copper covering is to reduce the impedance of the ground and improve the anti -interference ability; reduce the pressure drop and improve the efficiency of the power; connect with the ground line, and can also reduce the area of the circuit. For the purpose of making PCB as much as possible when welding, most PCB manufacturers will also require the PCB designer to fill the copper leather or grid -like ground wire in the open area of the PCB. Is it possible to reward, is it "benefits is greater than disadvantages" or "disadvantages than benefits"?
Everyone knows that in the case of high frequency, the distributed capacitors on the wiring on the printing circuit board will work. When the length is greater than 1/20 of the corresponding wavelength of the noise frequency, an antenna effect will be produced, and the noise will be launched outward through the wiring. If there is a copper cover with bad grounding in PCB, copper covering becomes a tool for spreading noise. Therefore, in the high -frequency circuit, do not think that it is "grounded to connect the ground on the ground. "Line", must play holes on the wiring at a distance of less than λ/20, and "good ground" with the horizon of multi -layer boards. If the copper covering treatment is appropriate, the copper covering not only has increased current, but also has a dual effect of shielding interference.
There are two basic ways of copper covering, namely a large area of copper covering and grid copper. It is often asked that large -scale copper covering is better or mesh covering copper. It is not easy to generalize. why? Large -scale copper covers has a dual effect of increasing current and shielding, but large -scale copper is covered. If the peak is welded, the board may be tilted and even foam. Therefore, large areas of copper covering generally open a few grooves to relieve copper foil foam. The simple grid covering copper is mainly shielded, and the role of increased current is reduced. From the perspective of heat dissipation (It reduced the heating surface of copper)) It also plays a certain role of electromagnetic shielding.
It should be pointed out that the grid is composed of a routing in the staggered direction. We know that for the circuit, the width of the wiring on the circuit board has its corresponding "electrical length" (the actual size is divided by the actual size. The number of numbers corresponding to the working frequency is available, and the relevant books are visible). When the operating frequency is not very high, the role of the grid line is not obvious. Once the electrical length and the working frequency match, it is very bad. It is found that the circuit cannot work normally, and the signal of the interference system work everywhere. Therefore, for my colleagues who use grids, my suggestion is to choose the work of the circuit board designed, do not hold a thing to do not let go. Therefore, high -frequency circuit counter -interference requirements are high -use grids, low -frequency circuits have large -current circuits and other commonly used copper.
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