A virtual carrier phase shift pulse width modulation strategy for asymmetrical cascaded multilevel power amplifiers

Authors

Yufei YUE, School of electrical and information engineering, Changsha University of Science and Technology, Changsha 410114, China
Xinglong WU, School of electrical and information engineering, Changsha University of Science and Technology, Changsha 410114, ChinaFollow
Xi YANG, School of electrical and information engineering, Changsha University of Science and Technology, Changsha 410114, China
Wen WANG, School of electrical and information engineering, Changsha University of Science and Technology, Changsha 410114, China
Xin TANG, School of electrical and information engineering, Changsha University of Science and Technology, Changsha 410114, China

Keywords

H‑bridge power module;asymmetrical cascaded multilevel power amplifier; virtual carrier phase shift pulse width modulation; high fidelity performance

Abstract

Conventional cascaded H‑bridge power amplifier (CHB‑PA) with N identical H‑bridge power modules (HBPMs) could create 2N+1 levels of output voltage at most, and the output voltage level will directly affect the sinusoidal characteristic and fidelity performance of power amplifiers. With the same number of cascaded HBPMs, this paper firstly proposes an asymmetrical cascaded multilevel power amplifier (ACM‑PA). Secondly, a virtual carrier phase shift pulse width modulation (VCPS‑PWM) strategy is proposed for ACM‑PA, which with the same HBPM number as conventional CHB‑PA, to increase the output voltage level up to 6N-3. Comparative simulation and experimental results are included to validate that the proposed ACM‑PA and VCPS‑PWM could obviously increase the output voltage level and decrease the total harmonic distortion (THD) of load current, thus to improve the fidelity performance of power amplifiers.

DOI

10.19781/j.issn.1673-9140.2023.05.008

First Page

75

Last Page

86

Recommended Citation

YUE, Yufei; WU, Xinglong; YANG, Xi; WANG, Wen; and TANG, Xin (2024) "A virtual carrier phase shift pulse width modulation strategy for asymmetrical cascaded multilevel power amplifiers," Journal of Electric Power Science and Technology: Vol. 38: Iss. 5, Article 8.
DOI: 10.19781/j.issn.1673-9140.2023.05.008
Available at: https://jepst.researchcommons.org/journal/vol38/iss5/8