Evaluation and Suppression of Oscillations in Inductive Power Transfer Systems With Constant Voltage Load and Pulse Skipping Modulation

This article identifies how constant voltage load characteristics cause inductive power transfer systems to exhibit a poorly damped oscillation mode. When operated with pulse skipping strategies such as pulse density modulation (PDM), the skipped voltage pulses can excite this mode and cause severe oscillations that do not appear in systems with a constant resistance load. The critical mode is identified from a linearized state-space model of the system and two control approaches are proposed for attenuating the oscillations in current amplitude and power flow. First, the influence of the operating frequency on the critical eigenvalue is analyzed and it is shown how slightly off-resonant operation can increase the damping of the oscillation mode. Second, an active damping method based on sending current feedback control is studied. The active damping is based on phase shift modulation with limited phase shift angles applied to the PDM signal when oscillations are detected. The effectiveness and feasibility of the proposed methods are validated by simulations and experimental results from a small-scale laboratory prototype.

Automated summary

This article discusses the influence of constant voltage load characteristics on inductive power transfer systems, causing poorly damped oscillation mode. It identifies a critical mode from a linearized state-space model and proposes two control approaches to attenuate the oscillations. The first approach analyzes the influence of operating frequency and how slightly off-resonant operation can increase damping. The second approach studies active damping based on phase shift modulation with limited phase shift angles applied to the PDM signal when oscillations are detected.