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• W2808220253 abstract "Wireless power transfer with a self-tuning <italic xmlns:mml=http://www.w3.org/1998/Math/MathML xmlns:xlink=http://www.w3.org/1999/xlink>LCC</i> inverter using pulsewidth modulation (PWM) controlled switched capacitor is proposed in this paper in order to compensate for the variations of Tx inductance. Usually, receivers contain magnetic and conductive materials for shielding and mechanical support. The inductance of the Tx coil is sensitive to the variation of Tx–Rx alignment because the interaction between the Tx coil and the Rx magnetic–conductive materials is also varied. It is shown that the detuning of the Tx inductance value exacerbates the losses in the <italic xmlns:mml=http://www.w3.org/1998/Math/MathML xmlns:xlink=http://www.w3.org/1999/xlink>LCC</i> inverter. In the proposed method, the PWM duty ratio of a single capacitor adjusts the effective output impedance of the <italic xmlns:mml=http://www.w3.org/1998/Math/MathML xmlns:xlink=http://www.w3.org/1999/xlink>LCC</i> inverter. The PWM feedback loop is designed such that the power factor and the real-part impedance of the <italic xmlns:mml=http://www.w3.org/1998/Math/MathML xmlns:xlink=http://www.w3.org/1999/xlink>LCC</i> inverter are maximized. The PWM switch is turned <sc xmlns:mml=http://www.w3.org/1998/Math/MathML xmlns:xlink=http://www.w3.org/1999/xlink>on</small> at zero voltage and turned <sc xmlns:mml=http://www.w3.org/1998/Math/MathML xmlns:xlink=http://www.w3.org/1999/xlink>off</small> with low <italic xmlns:mml=http://www.w3.org/1998/Math/MathML xmlns:xlink=http://www.w3.org/1999/xlink>dv</i> / <italic xmlns:mml=http://www.w3.org/1998/Math/MathML xmlns:xlink=http://www.w3.org/1999/xlink>dt</i> , minimizing switching losses. Such a soft-switching tunable capacitor can handle higher power compared to the traditional hard-switching capacitor, p-n junction capacitor, or an analog IC capacitor. Another advantage of the proposed technique is the continuity in achievable capacitance value using only one capacitor. The feedback can be fully implemented by analog components, obviating the necessity of digital samplings, ADC/DACs, and microcontrollers. The power of 54 W is transferred at 76.6% and 60.7% with and without the proposed method, respectively." @default.
• W2808220253 created "2018-06-21" @default.
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• W2808220253 date "2019-05-01" @default.
• W2808220253 modified "2023-10-06" @default.
• W2808220253 title "Self-Tuning <italic>LCC</italic> Inverter Using PWM-Controlled Switched Capacitor for Inductive Wireless Power Transfer" @default.
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• W2808220253 doi "https://doi.org/10.1109/tie.2018.2844796" @default.
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