Page 38 - PEN eBook July 2023
P. 38
POWER SUPPLY
Loss Analysis in
Low-Power
High-Frequency WPTSes
By Saumitra Jagdale, contributing writer for Power Electronics News
Wireless power transfer systems (WPTSes) for wearable and portable applications are gaining
popularity as the demand for wireless mobile phone and smartwatch chargers increases. Due
to the considerably low coupling factor (<0.1) between the primary transmitting (Tx) coil and
the secondary receiving (Rx) coil in such applications, achieving high efficiency has been very
challenging. Moreover, many consumer electronics are now battery-operated, which has greatly
increased interest in designing charging platforms for multiple receivers. Recently, for such kinds of
applications, there has been a push for operation in the restricted and unlicensed lower ISM band
at 6.78 MHz.
38 JULY 2023 | www.powerelectronicsnews.com
