Wireless Battery Charging Methods for Distributed Soldier Electronic Devices

Period of Performance: 06/17/2009 - 12/17/2009


Phase 1 SBIR

Recipient Firm

Eltron Research, Inc.
4600 Nautilus Court South
Boulder, CO 80301
Principal Investigator


Today s leading technology for wireless medium power transfer (less than 1kva) from a power transmission station to a load(s) is made possible by means of a magnetically linked resonant power transmission system. This system differs from a magnetically coupled transformer system in that for the magnetically linked resonant system the power transmitter and load(s) are operating at the same center frequency, with a very narrow bandwidth. In the Phase I project, we will demonstrate the ease, reliability and effective range that Eltron s system has. Eltron s system design takes full advantage of system impedance matching using a custom, unidirectional power emitter and spherical receiver antenna to maintain system s frequency and phase lock, producing a power transfer efficiency exceeding 75%. Eltron s system can be modified to accommodate unattended, untethered automatic recharging of a single cell to multi-celled secondary battery power pack used in portable equipment. The equipment containing the secondary batteries can be placed at a varying distance within two to three meters and at any arbitrary rotation relative to the charging system s emitter. Internal to the stated equipment will be a smart battery charger that regulates the batteries charge, depending on the number of batteries it contains.