Open AccessBattery powered high efficiency single‐stage switching amplifier
Author(s) -
Zhong Shu,
Xu Jianping,
Chen Xuejian,
Zhou Xiang
Publication year - 2016
Publication title -
electronics letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.375
H-Index - 146
ISSN - 1350-911X
DOI - 10.1049/el.2016.0810
Subject(s) - amplifier , stage (stratigraphy) , electrical engineering , single stage , battery (electricity) , materials science , electronic engineering , engineering , power (physics) , physics , cmos , paleontology , quantum mechanics , aerospace engineering , biology
A high efficiency single‐stage switching amplifier based on high‐frequency link inverter is proposed. Bipolar phase shift modulation is adopted in the proposed switching amplifier. Auxiliary circuits including freewheeling diodes, clamp capacitors and active clamp bridge (ACB) are added to provide a current flowing path for the inductor current during the dead time of the bidirectional switches. The ACB is synchronised with primary‐side switches to absorb the leakage inductor energy and clamp the secondary‐side transformer voltages. With single‐stage conversion and leakage inductor energy recycle, high efficiency of the proposed switching amplifier is achieved. A 5 V/25 W prototype is presented to verify the analysis results of the proposed switching amplifier.