Electric vehicles have many electronic devices, the current will generate a magnetic field, and the parts of the vehicle must have the ability to resist interference. In particular, electric vehicles are now used as a carrier, and unmanned driving will be more developed on this basis, so this technical issue is very important. For high-voltage systems, shielded connectors and cables are very important, but we should give priority to system-level layout. This is a prerequisite. If your OBC, the location of your layout, including the system in the system DCDC itself may have some congenital problems, even if the connector is well made, there will be various signal interference problems, so the system type should be considered first, and then the component level should be considered.