NDLI: Switch-linear hybrid envelope-tracking power supply with multilevel structure

Content Provider	IEEE Xplore Digital Library
Author	Qian Jin Xinbo Ruan
Copyright Year	2013
Description	Author affiliation: Aero-Power Sci-tech Center, Nanjing Univ. of Aeronaut. & Astronaut., Nanjing, China (Qian Jin; Xinbo Ruan)
Abstract	Based on the research of parallel-switch-linear hybrid envelope tracking (ET) power supply, this paper proposes a new topology where a multilevel structure converter in parallel with a linear amplifier. Adopting discrete level modulation, the converter operates each switcher only once during every tracking period. So it can achieve higher tracking bandwidth with the same switching frequency, compared to other schemes. Due to the poor anti-jamming capability of the comparators used in control circuits, the bandwidth must be lowered to suppress the high frequency noise. However, the low bandwidth leads to the limited loop gain at the tracking frequency, which is unable to reduce the load admittances of linear amplifier, forcing it to output an extra fundamental wave current component. This decreases the system efficiency greatly. The full feed-forward of the output voltage scheme is adopted to eliminate the influences from the output voltage to the linear amplifier output current. A prototype is built aiming for 300kHz sine wave tracking, with 10V~26V output voltage and 50W peak output power. The experimental results verify the effectiveness of theoretical analysis.
Sponsorship	IEEE Ind. Electron. Soc.
Starting Page	1325
Ending Page	1330
File Size	643295
Page Count	6
File Format	PDF
ISBN	9781479902248
ISSN	1553572X
DOI	10.1109/IECON.2013.6699324
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2013-11-10
Publisher Place	Austria
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Power supplies Switching frequency Modulation Switches Bandwidth Voltage control Inductance feed-forward power amplifier envelope tracking multilevel structure
Content Type	Text
Resource Type	Article

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