(1) First and foremost, the PCB size must be considered. If the PCB is too large, the printed lines become longer, leading to increased impedance, reduced noise immunity, and higher costs. Conversely, a PCB that is too small will have poor heat dissipation and nearby lines are more susceptible to interference. The shape of the circuit board is rectangular, with a length-to-width ratio of 3:2 or 4:3. Components located on the edges of the circuit board are generally not less than 2mm from the edge.
(2) When placing components, consider future welding and avoid crowding them too closely.
(3) Center the layout around the core components of each functional circuit. The components should be evenly, neatly, and compactly arranged on the PCB, with an effort to minimize and shorten the leads and connections between components. The decoupling capacitors should be as close as possible to the VCC of the devices. Aviation ground power 2, 36V aviation power 1, 400Hz frequency converter power 7, 115/200V power 2, 27V DC power 5, 400Hz power 12, aviation power
(4) In high-frequency working conditions, it is necessary to consider the distributed parameters between components. That's why the circuit should ideally arrange components in parallel. This not only enhances aesthetics but also facilitates assembly and soldering, making mass production easier.
(5) Arranging the positions of functional circuit units according to the circuit flow will facilitate signal flow, ensuring that the signals maintain a consistent direction as much as possible.
(6) The primary principle in layout is to ensure the connectivity of wiring. When moving components, pay attention to the connections of flying leads, and place components with wired connections together.
(7) Minimize loop area as much as possible to suppress the radiation interference of the variable frequency power supply.
