How to Reduce the Electromagnetic Interference of Industry Control PCB

How to Reduce the Electromagnetic Interference of Industry Control PCB

1. Reduce the Industry Control PCB loop, each loop is equivalent to an antenna, so we need to minimize the number of loops, the area of the loop and the antenna effect of the loop. Ensure that the signal has only one loop path at any two points, avoid artificial loops, and try to use the power layer.

2. Perform block processing according to different functions in the Industry Control PCB. In this process, the strong and weak electrical signals are separated, and the digital and analog signal circuits must be separated. The filter network of each part of the circuit must be connected nearby, which can not only reduce the radiation, but also improve the anti-interference ability of the circuit and reduce the chance of interference.

3. For wiring considerations, there should be no traces close to the frame of the Industry Control PCB to avoid disconnection during production. The power line should be wide, so the loop resistance will be reduced. The signal lines should be as short as possible and the number of vias should be reduced. The digital circuit and the analog circuit should be isolated by the ground wire, and the digital ground wire and the analog ground wire should be separated, and finally connected to the power ground.