Page 6 - PEN eBook March 2022
P. 6
COVER STORY — SEMICONDUCTORS
Enabling Greater Power
Density in Charger and
Adapter Designs with
Highly Efficient GaN-Based
Converters
By Zhong Fang Wang, principal applications engineer, and Matt Yang, senior
staff applications engineer, both at Infineon Technologies
The most popular power converter topology used in today’s charger and adapter applications
is quasi-resonant (QR) flyback topology, thanks to its simple structure and control, low
bill-of-materials cost, and high efficiency due to valley-switching operation. However, the
frequency-dependent switching loss of the switches and the leakage energy loss of the transformer
limit the maximum switching frequency of the QR flyback converter and thus limit the power
density.
6 MARCH 2022 | www.powerelectronicsnews.com
