Abstract
Inductive-resonant wireless power transfer systems are often used for wireless transfer of electric power. However, they are significant sources of radiated electromagnetic emissions. The effect of spread-spectrum approach based on classical switching frequency modulation of inductive-resonant wireless power transfer system inverter operating frequency and multi-frequency technique on the radiated emissions and efficiency is studied experimentally in detail. The influence of the classical frequency modulation and multi-frequency technique parameters on the peak radiated emission levels and the efficiency of the inductive-resonant wireless power transfer system are investigated more comprehensively. It is shown in the paper that the spread-spectrum approaches can lead to an appreciable radiated emissions reduction with small or large impact on the system’s efficiency. Some useful recommendations on how to choose parameters of the periodic switching frequency modulation or the multi-frequency technique considering a trade-off between the radiated emissions reduction and the efficiency are also proposed.
Highlights
Nowadays, one of the popular subfields of electronics and electrical engineering is transferring electric power without wires—wireless power transfer (WPT)
While a wireless battery charging of mobile electronic devices is often considered as an unnecessary extra, some applications of wireless power transfer should receive attention
In order to study the effect of periodic switching frequency modulation (SFM) and multi-frequency technique on th radiated emissions and the efficiency of the inductive-resonant WPT system, an experi mental prototype of the system has been designed and practically built
Summary
One of the popular subfields of electronics and electrical engineering is transferring electric power without wires—wireless power transfer (WPT). While a wireless battery charging of mobile electronic devices is often considered as an unnecessary extra, some applications of wireless power transfer should receive attention They include: wireless charging of the batteries for electrical vehicles [1–3]; wireless charging of mobile robots; wireless charging of the batteries for biomedical implanted devices [4]; dynamic electrical vehicle charging [5]; WPT to moving sensors [6]; WPT to wireless sensor networks nodes [7,8]. The inductive-resonant WPT method may be used at low power levels for battery charging of mobile electronic devices or implanted pacemakers as well as at mid and high power levels for the charging of batteries for light-duty electrical vehicles (e.g., passenger cars, etc.) and heavy-duty electrical vehicles (e.g., electrical tractors or buses) as well as mobile robots.
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