Preprint reveals a new charging system for mobile devices in off-grid scenarios, suggesting improved emergency communication solutions.
This preprint presents a hybrid off-grid mobile device charging architecture integrating a rapid-stroke spring-piston electromagnetic generator, threshold-triggered domino pulse conversion, and ambient radio-frequency (RF) energy supplementation. The system converts human mechanical input into watt-level electrical power while utilizing ambient RF as background energy, storing energy in supercapacitors for burst-mode 5V USB output suitable for emergency and off-grid smartphone charging. The architecture respects fundamental energy conservation principles and is intended for practical emergency communication, disaster preparedness, and remote operation scenarios.
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Rami Alkhaleeli (2026) studied this question.
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