21 general principles of wiring in circuit board design_ Provided by Chengdu circuit board design

SO SCM development guide 21

A widely circulated piece on the Internet , Who is better, the Indian electrician on the left or the German electrician on the right , Indian electricians can strip cocoons in disorder 、 Comb the hemp disorderly , German electricians work in accordance with rules , From the perspective of personal ability , It seems that Indian electricians are slightly better , But I still recommend German electrician , After all, I followed the rules from the beginning 、 Standard and tidy , There is no need to make that mess , It's very painful , After all , People with good body and strong resistance , People who use drugs to overcome diseases later , It's a lot easier .

Wiring in the circuit board is the same , Only by following the right rules , In order to build a reliable and durable circuit board , It's like having a vaccination first , later stage “ Fall ill ” Is less likely .

So what rules should circuit board wiring generally follow ？

1、 General rules

-> The wiring width should be as wide as possible , Generally, the power supply and ground wire should be wider

The circuit on the circuit board is actually a wire , Of course, the thicker the wire, the better , So the resistance is small , Good for current transmission . But infinite width is impossible , But the linewidth must meet at least a minimum , This is calculated according to the carrying capacity required by the line , A reference from the Internet is shown in the figure 2.

-> The larger the line spacing is, the better

The greater the distance between lines , Generally, the better the insulation 、 The smaller the interference between each other . Again , Infinite spacing is also impossible , This needs to establish a balance with the size of the circuit board , However, the wire spacing must at least meet the insulation requirements .

-> Components should be arranged and wired in a modular way . Relevant components are placed close , Then the wiring can also be shortened as far as possible .

2、 Routing rules

-> The wiring should be as short as possible , If there are three points of connection, connect them in turn , Try not to go far and then return to connect ;

-> Try not to parallel the lines between different layers , Avoid parasitic capacitance ;

-> The wiring should be as straight as possible , Turning use 45° Corner or arc , Avoid electromagnetic radiation , Especially in high-frequency circuits ;

-> Try not to put wires between component pins ;

3、 Anti interference principle

-> The principle of segregation . To prevent mutual interference , Sensitive lines should be separated as far as possible , Such as high-frequency lines and analog lines , Between AC and DC lines ;

-> Place a ground wire or ground plane between the lines with serious crosstalk , It can isolate and reduce crosstalk ;

Of course , There are other principles to follow , Not enough .

When routing automatically , Except linewidth 、 The line spacing can be set in the rule editor , Other principles cannot be met by automatic wiring . So in engineering application , Generally, handle sensitive and important lines with manual wiring first , The rest can adopt automatic wiring to speed up the design progress .

At the end of this section , Wonderful to be continued . Provide single chip microcomputer 、PLC、 Circuit board 、 controller 、 Instruments and Apparatuses 、 Software 、APP、 Electromechanical equipment or system 、 Industrial control 、 Automatic control system 、 Control system development and design customization .

Reference resources ：

[1] Multi-storey PCB Wiring rules and skills of circuit board

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