Abstract
In order to enhance the tolerance of frequency misalignment and solve the amplitude-bandwidth limitation issue of the traditional linear resonance wireless power transfer (WPT) system, this paper proposes a non-linear resonance WPT (NLR-WPT) system which is mainly composed of high frequency power supply, primary linear resonator, secondary non-linear resonator, and load. Such non-linear resonator can be implemented with passive linear capacitor and magnetic saturation inductor, and it can be described by Duffing equation. It has been shown that the bandwidth of NLR-WPT system in the nonlinear state is 1.7 times larger than that in the linear state. In addition, the output voltage basically stabilizes at the same level, the voltage fluctuation is less than 5% over the power frequency ranging from 25.6 kHz to 31.8 kHz, and high overall efficiency of 86.5% can be achieved under a wide range of frequency (27.5 kHz-30.1 kHz). Furthermore, the range of frequency can be extended significantly over which the output voltage is maintained even while the compensate capacitance, load, or coupling coefficient values vary in a certain range. The experimental results agree well with the theoretical analysis and verify the validity of the NLR-WPT system with non-linear resonator. This paper provides a simple and effective scheme to suppress the fluctuation of output voltage, which is suitable for the applications of constant voltage charging such as moving devices or electric vehicles.
Highlights
Coupled resonance (MCR) wireless power transfer (WPT) has grown from a fledgling technology to an alternative technology for domestic and industrial applications [1], [2]
The primary linear resonator is driven by a high-frequency power supply, while the magnetic energy is transmitted from primary linear resonator to the secondary linear resonator through time-varying magnetic fields
Both the primary linear resonator and the secondary linear resonator are composed of compensation network and coil, which is the key to the Magnetically coupled resonance (MCR)-WPT system [7]
Summary
Coupled resonance (MCR) wireless power transfer (WPT) has grown from a fledgling technology to an alternative technology for domestic and industrial applications [1], [2]. A variable inductor is proposed to track power frequency by changing the natural resonant frequency, which use the characteristic of magnetic saturation and its equivalent inductance can be varied continuously by changing the DC bias [19] Both of the above methods can change the reactance of the nonlinear capacitor or inductor in continuous values, the system can be operated in resonance state by adjusting the natural resonance frequency. It is not fundamentally different from the traditional linear resonator, the problems such as complexity, cost, size, and the additional power consumption of the system still exist.
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