PCB circuit board is the basis of all electronic circuit design electronic components, as the main support, which is equipped with all the components of the circuit. The role of PCB is not only a combination of scattered components, but also to ensure the regularity of circuit design, a good way to avoid the artificial cable and wiring caused by confusion and error.

This article on the power supply design of the PCB circuit board of the five key design points for a detailed introduction.

1, to have a reasonable direction

Such as input / output, AC / DC, strong / weak signal, high frequency / low frequency, high voltage / low voltage and so on. Their direction should be linear (or separate), not blending each other. The aim is to prevent mutual interference. The best direction is to follow the line, but generally difficult to achieve, the most unfavorable direction is the ring, but fortunately can be set to bring improvement. For DC, small signal, low voltage PCB design requirements can be lower. So "reasonable" is relative.

2, choose a good grounding: grounding is often the most important

Small grounding point I do not know how many engineering and technical personnel to do it on how much discussion, which shows its importance. Under normal circumstances require a total point, such as: forward amplifier of the ground should be merged and then connected with the trunk and so on. In reality, it is difficult to do so because of various restrictions, but should try to follow. The problem is quite flexible in practice, and everyone has their own set of solutions that can be easily understood if it is specific to the circuit board.

3, reasonable layout power supply filter / decoupling capacitor

Generally only a few power filter / decoupling capacitors are plotted in the schematic, but they are not indicated where they should be. In fact, these capacitors are for switching devices (gate) or other components need to filter / decoupling set, the layout of these capacitors should be close to these components, too far away from no effect. Interestingly, when the power supply filter / decoupling capacitor layout is reasonable, the grounding point of the problem becomes less obvious.

4, the line diameter required buried hole through the hole size appropriate

Conditional wide line never do fine; high pressure and high frequency line should be slippery, shall not have sharp chamfer, turn not use right angle. Ground wire should be as wide as possible, it is best to use a large area of ​​copper, this docking point problem has a considerable improvement. The size of the pad or wire hole is too small, or the size of the pad is not properly matched to the borehole size. The former is detrimental to manual drilling, which is detrimental to CNC drilling. Easy to drill into a "c" shape, while the drill is drilled off the pad. Wire is too small, and a large area of ​​the non-wiring area and not set copper, easily lead to uneven corrosion. That is, when the non-wiring area after corrosion, fine wire is likely to corrosion too far, or broken off, or completely broken. Therefore, the role of copper is not only set to increase the ground area and anti-jamming.

5, the number of holes through the solder joint and line density

Some problems in the early stages of circuit production is not easy to be found, they tend to emerge in the late, such as too many lines too, Shen copper process will be buried in a little carelessness. Therefore, the design should be minimized through the hole. Parallel to the parallel line density is too large, easy to connect into a piece of welding. Therefore, the line density should be determined according to the level of welding process. The distance between the solder joints is too small, is not conducive to manual welding, only to reduce the efficiency to solve the welding quality. Otherwise it will leave hidden dangers. Therefore, the determination of the minimum distance of the solder joint should take into account the quality and efficiency of the welding personnel.

If you can fully understand and master the above PCB circuit board design considerations, it can greatly improve the design efficiency and product quality. In the production to correct the existence of errors, will be able to save a lot of time and cost, saving rework time and material investment.