Conference paper
Multilevel tracking power supply for switch-mode audio power amplifiers
Switch-mode technology is the common choice for high efficiency audio power amplifiers. The dynamic nature of real audio reduces efficiency as less continuous output power can be achieved. Based on methods used for RF amplifiers this paper proposes to employ envelope tracking techniques to the power supply in order to improve efficiency.
A 100 W prototype system was designed. Measured results show that systems employing envelope tracking can improve system efficiency from 2% to 12%, i.e. a factor of 6. The temperature rise is strongly reduced, especially for the switching power MOSFETs where it is halved from 100 ◦C to 50 ◦C.
| Language: | English |
|---|---|
| Publisher: | IEEE |
| Year: | 2018 |
| Pages: | 406-411 |
| Proceedings: | 2018 IEEE Applied Power Electronics Conference and Exposition |
| ISBN: | 1538611791 , 1538611805 , 1538611813 , 9781538611791 , 9781538611807 and 9781538611814 |
| ISSN: | 10482334 and 24706647 |
| Types: | Conference paper |
| DOI: | 10.1109/APEC.2018.8341043 |
| ORCIDs: | Iversen, Niels Elkjær , Knott, Arnold and Andersen, Michael A. E. |
Multiplexing Power generation Power measurement Power supplies RF amplifiers Switches Temperature measurement Voltage measurement audio-frequency amplifiers envelope tracking high efficiency audio power amplifiers multilevel tracking power supply power 100.0 W power MOSFET power amplifiers radiofrequency amplifiers switch-mode audio power amplifiers switch-mode technology switched mode power supplies switching power MOSFET
