Multi-Cell Switch-Mode Power Amplifier with Closed-Loop Hybrid Output Voltage Filter
Conference: PCIM Europe 2015 - International Exhibition and Conference for Power Electronics, Intelligent Motion, Renewable Energy and Energy Management
05/19/2015 - 05/20/2015 at Nürnberg, Deutschland
Proceedings: PCIM Europe 2015
Pages: 8Language: englishTyp: PDF
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Authors:
Votzi, H. L.; Ertl, H. (University of Technology Vienna, Institute of Energy Systems and Electrical Drives, Power Electronics Section, Gusshausstr. 27-29, 1040 Wien, Vienna, Austria)
Abstract:
In this paper a promising novel output voltage filtering concept for multi-cell switch-mode power amplifiers is analyzed. The proposed hybrid filtering concept is based on a passive LC filter enhanced by a linear-mode correction stage of small rated power. Using this principle, also "sub-harmonic" (i.e. low-frequency) switching noise distortions (typically appearing in real interleaved multi-cell switching amplifiers) can be effectively suppressed which is not possible using conventional LC filters. Combining the new hybrid filtering approach with a switch-mode power amplifier formed by an arrangement of low-voltage MOSFET switching cells finally results in a power source of high output voltage precision at high efficiency rates.