PCB News - What does the pcb board slotting mean?

What does the PCB board slotting mean?

What does it mean to slot the PCB board? Slotting and slotting can be drawn on a mechanical layer, the width of the slot is the line width, and the shape of the slot is the line shape. If you need a ring, you can use the mechanical layer to draw multiple arcs. When drawing, it is enough to indicate that the mechanical layer is a slotted layer.

Between the strong and weak current on the PCB, the PCB material can also withstand a certain withstand voltage, but the PCB will be stained with dust and moisture after long-term use, resulting in a decrease in the withstand voltage, which means a decrease in the creepage distance.

Note: Creepage distance is the phenomenon that the insulation resistance decreases after the surface of the insulator is contaminated and damp, and a current (or even an arc) is generated under high voltage.

Between the high voltages of the components, the slotting of the PCB board can only be used to prevent insufficient creepage distance and increase the leakage current after the PCB board is damp. After the PCB is slotted, direct air isolation is used for short distances, and the electrical clearance, and its withstand voltage will be guaranteed to a certain extent. Slotting under the transformer is for better heat dissipation of the transformer while reducing EMC radiation caused by distributed capacitance.

The electric strength is the best in solid or liquid, such as diode PN junction, insulating grid of MOS tube, transformer oil. For example, the diameter of the bushing of a power transformer is not large, and the distance between the core column and the transformer shell is not large, but because it is in the transformer oil and ceramics, it can withstand very high voltages. (The casing is quite long, and the surface is made of corrugations and grooves to increase the distance along the surface.

Then there is normal temperature, normal pressure or high-pressure gas. The worst electric strength is solid, because the surface of the solid will be contaminated with dust and moisture.

The above is some knowledge of PCB slotting, I hope it will be helpful to you!
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