Abstract
This disclosure describes a simplified power-management circuit for electronic devices with dual power inputs (e.g., USB-C and DC Barrel Jack). It utilizes the internal mechanical shunt of a standard DC barrel jack to physically disconnect the ground path of the secondary power source (USB-C) when an external power adapter is inserted. This provides galvanic isolation between power sources without the need for active semiconductors or complex comparator circuits.
Creative Commons License
This work is licensed under a Creative Commons Attribution 4.0 License.
Recommended Citation
Bara, Pellumb, "Ground-Isolation Power Switching for Multi-Source DC Inputs via Mechanical Shunt", Technical Disclosure Commons, (February 09, 2026)
https://www.tdcommons.org/dpubs_series/9301
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