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High Precision Switched Mode Amplifier with an Auxiliary Bias Circuit
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| Author(s) |
Jan SCHELLEKENS, Jorge DUARTE, Henk HUISMAN, Marcel HENDRIX, Elena LOMONOVA, Mark CARIS |
| Abstract |
Blanking time, also referred to as dead-time, is one of the dominant sources of output current and voltagedistortion in pulse-width modulated power amplifiers. Extensive studies are known on elimination,minimization, and compensation of the effect. Most techniques achieve a reduction of the distortion butare not capable of completely removing it. Topologies like the opposed current converter do not requiredead-time and therefore do not suffer from this nonlinear effect.In order to ensure continuous conduction mode, opposed current converters require bias current thatnormally flows through the output filter inductors. This paper presents an alternative approach wherethe bias current is supplied from additional current controlled switching legs. A modulation strategyis proposed and guidelines are given for the design of the inductive components. Finally the inductorvolume of the proposed topology is compared to the opposed current converter equal showing that bothtopologies are comparable with respect to volume of the passive components. |
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| Filename: | 0345-epe2013-full-12122495.pdf |
| Filesize: | 1.439 MB |
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| Type |
Members Only |
| Date |
Last modified 2014-02-09 by System |
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