Packaging and details of a wireless power device
First Claim
Patent Images
1. An apparatus for delivering power to a load via a wireless field, comprising:
- an antenna coil;
a resonant circuit comprising said antenna coil and a capacitor in series with said antenna coil, said resonant circuit configured to receive power transmitted from a transmitter via a non-modulated wireless magnetic field at a frequency; and
a power converting circuit, coupled to said antenna coil, the power converting circuit configured to receive a signal at a receive power level from the antenna coil and to convert the received signal to a charging signal, the charging signal having a voltage and current satisfying the requirements of a battery and sufficient to charge the battery, the power converting circuit configured to vary an impedance based on the received power level to tune the resonant circuit such that the resonant circuit resonates at the frequency.
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Abstract
A wireless power system includes a power source, power receiver, and components thereof. The system can also include a parasitic antenna that can improve the coupling to the power source in various modes. The antenna can have both a variable capacitor and a variable inductor, and both of those can be changed in order to change characteristics of the matching.
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Citations
29 Claims
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1. An apparatus for delivering power to a load via a wireless field, comprising:
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an antenna coil; a resonant circuit comprising said antenna coil and a capacitor in series with said antenna coil, said resonant circuit configured to receive power transmitted from a transmitter via a non-modulated wireless magnetic field at a frequency; and a power converting circuit, coupled to said antenna coil, the power converting circuit configured to receive a signal at a receive power level from the antenna coil and to convert the received signal to a charging signal, the charging signal having a voltage and current satisfying the requirements of a battery and sufficient to charge the battery, the power converting circuit configured to vary an impedance based on the received power level to tune the resonant circuit such that the resonant circuit resonates at the frequency. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16)
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17. A method comprising:
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receiving power via a resonant circuit from a non-modulated wireless magnetic field at an operating frequency and at a receive power level; converting the received power, so as to charge a battery, with a power converting circuit having an impedance value that is variable; and varying the impedance value of the power converting circuit to tune the resonant frequency of the resonant circuit based on the received power level. - View Dependent Claims (18, 19, 20, 21, 22, 23, 24)
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25. An apparatus comprising:
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means for receiving power via a resonant means from a non-modulated wireless magnetic field at an operating frequency and at a receive power level; means for converting the received power, so as to charge a battery, the means for converting the received power having an impedance value that is variable; and means for varying the impedance value of the means for converting the received power, to tune a resonant frequency of the resonant means based on the received power level. - View Dependent Claims (26, 27, 28, 29)
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Specification