Abstract
In a magnetic coupling resonant wireless power transfer (MCR-WPT) system, energy is transferred between transmitter and receiver coils with same natural resonant frequency ω0. Studying energy transfer mechanism is the theoretical basis of MCR-WPT control. This paper takes the MCR-WPT system with two coils as the research object. Firstly, the model of the system is established. Then, combined with the theory of waves, the change of the capacitor charge of the two resonant circuits is analysed, which is drawn up during the linear superposition of two different frequency modes and is also a modulation wave with a specific system resonant frequency ωs as the carrier frequency and ωΔ as the modulation frequency. Where ωs is different from ω0. Next, the energy of the two resonant circuits is analysed, which is transferred with the beat frequency 2ωΔ. Finally, ANSYS Simplorer and Maxwell co-simulation is used to verify the correctness of the theory of this paper.
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