Why Do You Have to Avoid Right Angles When Drawing PCB Traces?
When we solder circuit boards or repair electronic products, we will find that the copper foil wires arranged on all circuit boards are not straight lines, but various turning lines with a certain angle. This is because the electronic components on the electronic circuit boards are The devices are relatively dense, so try to avoid various electronic components when wiring, so the wiring must have various turns.
The most important thing is that when we usually use software to draw copper foil lines on circuit boards, we not only use wires to connect components, but also pay attention to not drawing copper foil lines at right angles at the corners when wiring. This is mainly to prevent The copper foil circuit on the circuit board causes interference to the electronic components near it when it is energized, and the anti-interference performance of the entire circuit board can be improved by various ways of corner routing.
Therefore, when designing a PCB circuit board, whether it is manual wiring or automatic wiring.
Six Wire Routing Methods Are Generally Used.
- 45° corner
- 45° arc angle
- 90° arc angle
- 90° right angle corner
- Arbitrary corner
- Smooth arc corners
In addition, when designing and drawing circuit PCB boards, we must not only consider the position of components, the anti-interference of the circuit board, etc., but also consider the safety and stability of the circuit board. For example, the safe distance between two wires, especially when the PCB circuit board is going to pass high voltage, the circuit on the circuit board should turn smoothly without sharp chamfers, otherwise it will cause the circuit board to fire and break down, or even cause damage to the circuit board. cause a fire.
Especially in high-frequency circuits, the wiring on the circuit board can’t just follow a straight line.
All copper foil lines should be rounded or beveled at 45° when turning, because the right angle or sharp angle will also affect the electrical performance of the circuit in the case of high frequency circuits and high wiring density.
If the wiring of our circuit board is double-sided, the wires on both sides should be oblique or bent, or the wires on both sides can be perpendicular to each other, and must not be parallel to each other, so as to avoid interference.
When we make the traces on the PCB board, the inner angle of the turning point of the printed wires should generally not be less than 90°. In most cases, 135° or rounded corners are selected, which can also reduce the parasitic resistance and parasitic inductance of the printed wires.
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