TY - JOUR
T1 - Analysis and Design of Load-Independent Series Resonant Power Amplifier with Constant Current Output and Its Application for WPT System
AU - Komiyama, Yutaro
AU - Komanaka, Ayano
AU - Zhu, Wenqi
AU - Konishi, Akihiro
AU - Nguyen, Kien
AU - Sekiya, Hiroo
N1 - Publisher Copyright:
© 1986-2012 IEEE.
PY - 2024/5/1
Y1 - 2024/5/1
N2 - This article presents an analysis and design of a load-independent (LI) series resonant (SR) power amplifier with constant current (CC) output, along with its application for an MHz wireless power transfer (WPT) system. A novel inverse Class E power amplifier is introduced, which essentially produces a sinusoidal output current even with a low-Q SR filter. Besides, the proposed amplifier achieves zero-current switching and CC output simultaneously, regardless of the load resistance. The LI operation is obtained for a specific set of component values, whose design conditions are clarified analytically in this article. The experiment was carried out with a WPT system incorporating the proposed amplifier as a transmitter and the Class D rectifier as a receiver. Although the input reactance of the Class D rectifier changed against dc-load variations due to the parasitic capacitances, the proposed amplifier showed consistent CC operation by using the low-Q SR filter. Also, the proposed WPT system maintained a low total harmonic distortion of the transmission current over the wide load range, even with the low-Q output filter. The prototype WPT system with the proposed amplifier achieved 88% power-delivery efficiency with 60 W output power at 3.39 MHz transmission frequency. The experimental results showed the effectiveness of the proposed amplifier.
AB - This article presents an analysis and design of a load-independent (LI) series resonant (SR) power amplifier with constant current (CC) output, along with its application for an MHz wireless power transfer (WPT) system. A novel inverse Class E power amplifier is introduced, which essentially produces a sinusoidal output current even with a low-Q SR filter. Besides, the proposed amplifier achieves zero-current switching and CC output simultaneously, regardless of the load resistance. The LI operation is obtained for a specific set of component values, whose design conditions are clarified analytically in this article. The experiment was carried out with a WPT system incorporating the proposed amplifier as a transmitter and the Class D rectifier as a receiver. Although the input reactance of the Class D rectifier changed against dc-load variations due to the parasitic capacitances, the proposed amplifier showed consistent CC operation by using the low-Q SR filter. Also, the proposed WPT system maintained a low total harmonic distortion of the transmission current over the wide load range, even with the low-Q output filter. The prototype WPT system with the proposed amplifier achieved 88% power-delivery efficiency with 60 W output power at 3.39 MHz transmission frequency. The experimental results showed the effectiveness of the proposed amplifier.
KW - Constant current (CC)
KW - inverse class e amplifier
KW - load-independent (LI)
KW - total harmonic distortion (THD)
KW - wireless power transfer (WPT)
UR - http://www.scopus.com/inward/record.url?scp=85186086325&partnerID=8YFLogxK
U2 - 10.1109/TPEL.2024.3367373
DO - 10.1109/TPEL.2024.3367373
M3 - Article
AN - SCOPUS:85186086325
SN - 0885-8993
VL - 39
SP - 6515
EP - 6525
JO - IEEE Transactions on Power Electronics
JF - IEEE Transactions on Power Electronics
IS - 5
ER -