Open AccessSoft‐switching single‐stage three‐level power amplifier for high‐voltage audio distribution systems
Author(s) -
Guo Shilin,
Su Jianhui,
Chen Xuejian,
Yu Xiang
Publication year - 2016
Publication title -
electronics letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.375
H-Index - 146
eISSN - 1350-911X
pISSN - 0013-5194
DOI - 10.1049/el.2016.2220
Subject(s) - commutation , amplifier , inductor , voltage , commutation cell , capacitor , electronic engineering , electrical engineering , pulse width modulation , computer science , engineering , power factor , cmos , constant power circuit
An isolated fully soft‐switching single‐stage three‐level power amplifier (SS3L) based on dual auxiliary networks (DAN) is proposed in this Letter. Compared with the conventional class‐D power amplifier, the proposed DAN‐SS3L achieves high level of integration without bulky dc link capacitor, and high‐efficiency by single‐stage conversion and zero voltage switching for all the switches under different operating conditions from light load to full load, which is suitable for high‐voltage audio distribution systems. By adopting active auxiliary network, the energy stored in the leakage inductor can be recycled, which eliminates the pulse width modulation voltage spikes. The passive auxiliary network provides enough reactive current for primary‐side switches, extending soft‐switching range. In addition, commutation overlap strategy is employed to enable natural commutation of bidirectional switches. Experimental results of a 200 W prototype are presented to verify the analysis results.