Maximum Allowable Working Current of Printed Wire
The maximum allowable working current of printed wire can be calculated using the formula: I = KT^0.44A^0.75. Here, K is the correction factor, with values of 0.024 for inner layer and 0.048 for outer layer copper-clad wires. T represents the maximum temperature rise in degrees Celsius, A is the cross-sectional area of the copper clad wire in mil, and I is the maximum allowable current in Amperes.
Principles of Environmental Effects
Consider the application environment when designing a PCB. For instance, in environments prone to vibration or deformation, using thin copper film wires may lead to peeling and breakage.
Safe Working Principles
Ensure safe operation by maintaining a minimum distance between wires to withstand voltage peaks. Smooth high-voltage wires and avoid sharp chamfers to prevent circuit breakdown.
Convenient Assembly and Standard Principles
Design wiring layouts for easy assembly. When dealing with large ground and power lines on a PCB, consider opening windows for corrosion prevention. Follow assembly specifications to prevent misunderstandings, especially when using surface pads or gold finger plugs.
Economic Principles
Design with economic considerations in mind, understanding that thinner wires and smaller vias may increase costs. Knowledge of processing and assembly processes is key to adhering to this principle.
Thermal Effect Principle
When designing a printed board, distribute heat load evenly, use radiators for parts, and consider forced air cooling. Arrange devices on the board strategically based on heat dissipation, calorific value, and heat resistance to optimize thermal management.
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