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How do the electronic components inside the rainproof switching power supply maintain normal electrical insulation performance in a humid environment?

Release Time : 2024-12-12
In a humid outdoor environment, the electronic components inside the rainproof switching power supply need to maintain normal electrical insulation performance. A multi-pronged approach and a carefully constructed protection system are required.

Component selection is the key first step. Electronic components with high insulation performance are preferred, such as ceramic capacitors and mica capacitors. They are naturally low in water absorption and high in dielectric constant. Even if the humidity soars, they can still adhere to their insulation duties and effectively block current leakage. For resistors, metal film resistors, with their dense metal oxide film layer, can resist water vapor erosion, ensure stable resistance values, and prevent short circuits due to moisture. For core devices such as transistors and integrated circuits, products with moisture-proof packaging technology are selected. The plastic packaging material tightly wraps the chip, like an indestructible armor, keeping moisture out.

Circuit board design and protection technology are crucial. The surface of the circuit board will be coated with a special moisture-proof paint. This thin but tough paint film seamlessly fills the tiny gaps between the lines, cuts off the water vapor channel, and does not affect the high-speed galloping of electronic signals. In high humidity areas, such as the high voltage side of the power supply, a multi-layer circuit board design is used, and the inner signal layer is surrounded by the outer ground shielding layer, which not only resists external electric field interference, but also adds a safety lock to the insulation performance in humidity.

Strict control of process details in the production process. The welding process adheres to the principle of fast and accurate, using low-temperature lead-free solder to reduce thermal shock and prevent excessive water vapor from being absorbed into the components; after welding, it is immediately sent to a nitrogen-protected drying room to drive away residual moisture and stabilize the component welding points and internal structure. When wiring, the power line and the signal line are kept at a safe distance to avoid creepage caused by the proximity of the lines in a humid environment; the high-voltage line is additionally wrapped with an insulating sleeve, and a silicone sleeve is selected, which is resistant to moisture and weather and can escort high-voltage transmission in humidity.

Daily operation and maintenance should not be underestimated either. Perform regular inspections and use insulation resistance testers to monitor the insulation resistance of key nodes. Once the value is abnormal, immediately check for hidden dangers. When the power supply is idle, store it in a dry constant temperature cabinet. The built-in desiccant continuously absorbs any water vapor that may be mixed in, ensuring that the electronic components are always ready for action. Even if it rains heavily and the air is humid, the electrical insulation performance can be maintained, allowing the rainproof switching power supply to operate reliably and continue to deliver strong power to outdoor equipment.
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