Switching Frequency Control for a DS-PWM

Conference: PCIM Europe 2018 - International Exhibition and Conference for Power Electronics, Intelligent Motion, Renewable Energy and Energy Management
06/05/2018 - 06/07/2018 at Nürnberg, Deutschland

Proceedings: PCIM Europe 2018

Pages: 8Language: englishTyp: PDF

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Klein, Axel; Thielmann, Malte; Schumacher, Walter (Technical University of Braunschweig, Germany)

In 2014 Homann and Schumacher presented a new PWM-modulator (ΔƩ-PWM). This hysteresis based modulator allows to fully utilize the advantages of the δ σ signal processing (DSSP). Because of the hysteresis based switching cycle of the ΔƩ-PWM one main feature is a variable switching frequency. In this paper a method for controlling the average switching frequency is presented. In order to guarantee a lower PWM frequency boundary, an frequency guard is presented. The paper finishes with an experimental verification of the presented PWM frequency controller and frequency guard.