Diagnostic Module Power Transfer via I/O Interface

The patent introduces an intermediary power transfer mechanism through the I/O interface that enables power flow from the diagnostic equipment to the electronic device's diagnostic subcomponent. This mediator role allows the diagnostic module to receive power externally when the device's power supply fails, resolving the contradiction between maintaining simple structure and ensuring reliable diagnostic capability under power loss conditions.

The patent implements dynamic power direction control where the I/O interface can bidirectionally transfer power depending on the operational state. During normal operation, the electronic device powers the diagnostic module; during power failure, the diagnostic equipment powers the module. This dynamic adaptation ensures the diagnostic subcomponent remains operational regardless of power source availability, improving both ease of operation and reliability.

The patent applies multi-functionality to the I/O interface by enabling it to perform both data communication and bidirectional power transfer. The interface is designed to detect power loss conditions and automatically switch power flow direction, allowing a single interface to serve multiple functions. This universal design improves adaptability without significantly increasing complexity, as the same physical interface handles both data and power tasks.