PWM Power Audio Amplifier With Voltage/Current Mixed Feedback for High-Efficiency Speakers
Adduci, P.; Botti, E.; Dallago, E.; Venchi, G.
Industrial Electronics, IEEE Transactions on
Volume 54, Issue 2, April 2007 Page(s):1141 - 1149
Digital Object Identifier   10.1109/TIE.2007.892610
Summary:High-efficiency speakers significantly improve electrical to sound power conversion efficiency by reducing the power dissipation over the speaker coil. However, they require some equalization of the input signal. In this paper, a new driving technique based on a pulsewidth-modulation switching amplifier is presented. This exploits a double voltage/current feedback to obtain automatic equalization. Furthermore, the double feedback allows the output resonant filter to be included in the feedback path, compensating for its nonlinearity. Finally, the mixed feedback acts as intrinsic current limiter. Both theoretical analysis and simulations demonstrate that this system is feasible. The results were also confirmed by measurements using a prototype

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