A Multi-Cycle Switching Technique for Efficient Ultrasonic Wireless Power Delivery

作者：Gougheri Hesam Sadeghi; Kiani Mehdi^*

来源：IEEE TRANSACTIONS ON CIRCUITS AND SYSTEMS II-EXPRESS BRIEFS, 2018, 65(3): 286-290.

DOI：10.1109/TCSII.2017.2689014

• Wireless power transmission
• biomedical implants
• ultrasound
• power management
• efficiency

A multi-cycle switching technique is proposed for efficient ultrasonic power delivery by providing dc-level shifting and load transformation in the receiver (Rx) side. This technique can increase the power delivery efficiency in the Rx and achieve larger voltages across the load (R-L). In the proposed switching scheme, the Rx transducer is first shorted for several power carrier cycles, T-p, to store the energy into the Rx ultrasonic transducer, and then is opened to deliver the energy to the load. A circuit model for this scheme has been presented and verified by simulations. In a proof-of-concept measurement setup, the proposed ultrasonic WPT link, operating at f(p) = 1/T-p = 1.02 MHz, achieved a large rectified voltage (V-L) of 4.7 V by shorting the Rx transducer for 5xT(p) and then delivered the energy to an R-L of 100 k Omega within T-p, with the switching rate of f(sw) = 1/6T(p) = 170 kHz. For the same input power, a conventional ultrasonic link with a passive full-wave rectifier achieved a small V-L of 1 V.

• 出版日期2018-3