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 (RL). In the proposed switching scheme, the Rx transducer is first shorted for several power carrier cycles, Tp, 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 fp = 1/Tp = 1.02 MHz, achieved a large rectified voltage (VL) of 4.7 V by shorting the Rx transducer for 5×Tp and then delivered the energy to an RL of 100 kΩ within Tp, with the switching rate of fsw = 1/6Tp = 170 kHz. For the same input power, a conventional ultrasonic link with a passive full-wave rectifier achieved a small VL of 1 V.
|Original language||English (US)|
|Number of pages||5|
|Journal||IEEE Transactions on Circuits and Systems II: Express Briefs|
|State||Published - Mar 2018|
All Science Journal Classification (ASJC) codes
- Electrical and Electronic Engineering