Printed Circuit Board Power Wiring Rules Six Skills

PCB power routing is a very important part of printed circuit board design. The quality of power wiring directly affects the stability and performance of the circuit. This article will introduce several PCB power wiring skills to help you better deal with power wiring problems when designing PCB.

1. Reasonable choice of power supply path

In PCB design, the choice of power supply path is very important. The power supply path should be shortened as much as possible to reduce the resistance of the power line and reduce the power loss. At the same time, the power cord should be avoided as far as possible with other signal lines to reduce electromagnetic interference. In the layout, the power supply path can be planned into a grid shape, so that the power supply is more evenly distributed on the PCB board.

2. The use of appropriate power layer

Modern PCB design usually adopts multi-layer board structure, and reasonable selection of power layer can effectively improve the quality of power wiring. In the design, the power layer can be considered to be adjacent to the ground in order to facilitate the quick connection of the power supply. In addition, an independent power layer can also be set up inside the PCB to provide power to key components to improve the stability and performance of the circuit.

3. The use of decoupling capacitor

Decoupling capacitors play a very important role in power supply wiring. It can reduce the fluctuation of the power supply and improve the stability and anti-interference ability of the power supply. In the design, the decoupling capacitor should be placed as close as possible to the power input to reduce the resistance and inductance of the power line. In addition, the capacity and voltage resistance of the decoupling capacitor should be selected according to the specific application scenario.

4. Pay attention to the layout of the power supply

In PCB design, the layout of power and ground is very important. It should be ensured that there is a good connection between the power source and the ground to reduce the ground resistance and improve the stability of the circuit. At the same time, too many signal lines should be avoided between the power source and the ground to reduce electromagnetic interference. In the layout, the power and ground lines can be planned into a grid shape, so that the power and ground lines are more evenly distributed on the PCB board.

5. The use of filters

The filter can effectively reduce the noise and interference on the power line and improve the quality of the power supply. In the design, you can consider setting a filter between the power input and the decoupling capacitor to reduce the high-frequency noise on the power line. In addition, a special filtering network can be set up inside the PCB to reduce noise and interference on the power line.

6. Set power protection area reasonably

In PCB design, a power protection zone is the area around the power cord that is used to protect the cord from interference. In the layout, the power protection area should be set as large as possible to improve the anti-interference ability of the power supply. In addition, some protective measures can also be set up in the power supply protection area, such as magnetic rings, shielding covers, etc., to further reduce the noise and interference on the power line.

PCB power routing is a very important part of printed circuit board design. Through reasonable selection of power supply path, the use of appropriate power layer, decoupling capacitor, pay attention to the layout of the power supply, the use of filters and the setting of power protection areas, the quality of power supply wiring can be effectively improved to ensure the stability and performance of the circuit.