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 […]