A system for robust and efficient wireless power transfer

Phys.org  May 18, 2020
Wireless power transfer set-ups typically suffer from an inherent sensitivity to the relative movement of the device with respect to the power source. Previous implementations to deliver robust wireless power transfer even while a device is moving rapidly have relied on an inefficient gain element based on an operation-amplifier circuit, which has inherent loss, and hence have exhibited poor total system efficiency. Researchers at Stanford University have shown that robust and efficient wireless power transfer can be achieved by using a power-efficient switch-mode amplifier with current-sensing feedback in a parity–time symmetric circuit. The parity–time symmetry guarantees that the effective load impedance on the switch-mode amplifier remains constant, and hence the amplifier maintains high efficiency despite variation of the transfer distance. They demonstrated such a system that wirelessly transferred around 10 W of power to a moving device with a nearly constant total efficiency of 92% and over a distance from 0 to 65 cm…read more. TECHNICAL ARTICLE

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