US Patent 9439316 Submersible power distribution system and methods of assembly thereof

A submersible power distribution system is provided. The system includes at least one receptacle configured to be exposed to an underwater environment and a plurality of power conversion modules positioned within the at least one receptacle. Each of the plurality of power conversion modules includes a first enclosure configured to be exposed to the underwater environment, the first enclosure defining a first interior cavity configured to have a first pressure. Power conversion modules also include at least one second enclosure positioned within the first interior cavity. The at least one second enclosure defines a second interior cavity configured to have a second pressure that is lower than the first pressure. The at least one second enclosure is configured to restrict exposure of non-pressure-tolerant power electronics in the second interior cavity to the first pressure.