Higher Power Density Amplifiers

Iversen NE, Dahl NJ, Knott A, Andersen MAE. Higher Power Density Amplifiers. J Audio Eng Soc. 2018;66(12):1051-1061. doi:10.17743/jaes.2018.0064

@article{Iversen2018_19878,
  author = {Iversen, Niels E. and Dahl, Nicolai J. and Knott, Arnold and Andersen, Michael A.E.},
  title = {{Higher Power Density Amplifiers}},
  journal = {Journal of the Audio Engineering Society},
  volume = {66},
  number = {12},
  pages = {1051--1061},
  year = {2018},
  month = dec,
  publisher = {Audio Engineering Society},
  doi = {10.17743/jaes.2018.0064},
  url = {https://doi.org/10.17743/jaes.2018.0064}
}

TY  - JOUR
TI  - Higher Power Density Amplifiers
AU  - Iversen, Niels E.
AU  - Dahl, Nicolai J.
AU  - Knott, Arnold
AU  - Andersen, Michael A.E.
T2  - Journal of the Audio Engineering Society
J2  - J. Audio Eng. Soc.
VL  - 66
IS  - 12
SP  - 1051
EP  - 1061
PY  - 2018
DA  - 2018/12/06
DO  - 10.17743/jaes.2018.0064
UR  - https://doi.org/10.17743/jaes.2018.0064
PB  - Audio Engineering Society
LA  - en
AB  - This paper proposes a new switching strategy for switch-mode power audio amplifiers that reduces the power dissipation in the switching devices of the power stage. The strategy is based on a thorough analysis of the loss mechanism and operating conditions of the power stage and how it relates to the audio input. The strategy utilizes a high-ripple current combined with full state control to improve soft switching capabilities. This shifts the losses from switching devices to the filter inductors, which are less sensitive to loss variations because of a larger form factor. Measured results on 100-W test amplifiers show that the proposed strategy reduces the power dissipation within the switches, causing up to 45°C temperature reduction locally in the switches and up to 35°C globally in the amplifier. THD+N levels are reduced to 0.03 % and power density of the implemented amplifiers is 6 W/cm3. Two amplifiers were implemented.
ER  -