How to design the shielding overlap of inverter connectors

Designing the shielding overlap of inverter connectors is crucial for ensuring the continuity of the cable shielding layer and maintaining overall shielding effectiveness. The shielding overlap requires a low-impedance, 360-degree electrical connection. Design considerations include: selecting shielded connectors with metal housings, such as metal D-sub connectors, shielded terminal blocks, and shielded aviation plugs. During connector installation, the metal housing must achieve low-impedance contact with the metal panel of the inverter cabinet, typically achieved through the connector's built-in metal clamps, spring clips, or conductive sealing rings, pressing them firmly against the unpainted metal panel when tightening the screws.

The cable shielding layer should be reliably connected to the connector's metal housing via the shielding clip or crimp terminals at the rear of the connector to terminate the shielding layer. For multi-core cables, the shielding layer should cover all cores as much as possible and overlap uniformly at the connector. Avoid using the "pigtail" method of twisting the shielding layer into a single strand and then soldering it, as this results in very high impedance at high frequencies. The IP rating and shielding effectiveness requirements of the connector must be considered during the design process. ENT Electronics offers a variety of shielded connectors and accessories to help engineers achieve shielded overlap designs that meet EMC requirements.