Method and apparatus with negative resistance in wireless power transfers
First Claim
1. A wireless power-receive circuit, comprising:
- a receive antenna configured to receive power from an electromagnetic field;
a capacitance element operably coupled with the receive antenna and comprising a capacitance value and an equivalent series resistance value; and
a negative resistance generator operably coupled in series with the capacitance element and coupled to a load, the load configured to draw power from the electromagnetic field, the negative resistance generator being configured to generate a negative resistance value to at least partially offset the equivalent series resistance value and an ohmic resistance of the receive antenna.
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Accused Products
Abstract
Exemplary embodiments are directed to wireless power transfer. Antenna circuits use negative resistance to offset resistance from other elements in the circuit. The antenna circuits include an antenna for coupling with a near field radiation at a resonant frequency and a capacitance element connected in series with the receive antenna. The antenna circuits also include a negative resistance generator connected in series with the capacitance element. In the case of a receive antenna, and possibly a repeater antenna, a load is connected in series with the negative resistance generator. The load may draw power from the near field radiation when the antenna circuit oscillates near the resonant frequency. In the case of a transmit antenna, a signal generator is coupled in series with the antenna for applying signal power to the antenna circuit to generate an electromagnetic field at the resonant frequency creating a coupling-mode region within a near field.
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Citations
31 Claims
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1. A wireless power-receive circuit, comprising:
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a receive antenna configured to receive power from an electromagnetic field; a capacitance element operably coupled with the receive antenna and comprising a capacitance value and an equivalent series resistance value; and a negative resistance generator operably coupled in series with the capacitance element and coupled to a load, the load configured to draw power from the electromagnetic field, the negative resistance generator being configured to generate a negative resistance value to at least partially offset the equivalent series resistance value and an ohmic resistance of the receive antenna. - View Dependent Claims (2, 3, 4, 5)
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6. A wireless power-transmit circuit, comprising:
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a transmit antenna configured to generate an electromagnetic field; a capacitance element operably coupled with the transmit antenna and having a capacitance value and an equivalent series resistance value; a negative resistance generator operably coupled in series with the capacitance element, the negative resistance generator being configured to generate a negative resistance value to at least partially offset the equivalent series resistance value and an ohmic resistance of the transmit antenna; and a signal generator operably coupled between the transmit antenna and the negative resistance generator, the signal generator configured to apply a power signal to the wireless power-transmit antenna to generate the electromagnetic field. - View Dependent Claims (7, 8, 9, 10)
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11. A wireless power-repeater circuit, comprising:
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a repeater antenna configured to be coupled with an electromagnetic field within a first region of the electromagnetic field for transferring power, the repeater antenna configured to repeat the electromagnetic field in a second region for transferring power, the second region being different from the first region; a capacitance element operably coupled with the repeater antenna, the capacitance element having a capacitance value and an equivalent series resistance value; and a negative resistance generator operably coupled in series with the capacitance element and coupled to a load, the negative resistance generator configured to generate a negative resistance value to at least partially offset the equivalent series resistance value and an ohmic resistance of the repeater antenna. - View Dependent Claims (12, 13, 14, 15)
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16. A method, comprising:
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generating an electromagnetic field with a transmit antenna circuit for transferring power within a region to a receive antenna disposed within the region the transmit antenna circuit including a transmit antenna, a capacitance element operably coupled with the transmit antenna and having a capacitance value and an equivalent series resistance value, a negative resistance generator operably coupled in series with the capacitance element, and a signal generator coupled between the transmit antenna and the negative resistance generator and setting a negative resistance value of the negative resistance generator to at least partially offset the equivalent resistance value and an ohmic resistance of the transmit antenna. - View Dependent Claims (17)
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18. A method, comprising:
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receiving power at a receive antenna circuit via an electromagnetic field generated by a transmit antenna circuit, the electromagnetic field having a region for transferring power, and the receive antenna circuit including a receive antenna disposed within the region, a capacitance element operably coupled with the receive antenna and having a capacitance value and an equivalent series resistance value, and a negative resistance generator operably coupled in series with the capacitance element and coupled to a load, the load configured to draw power from the electromagnetic field; and setting a negative resistance value of the negative resistance generator to at least partially offset the equivalent resistance value and an ohmic resistance of the receive antenna. - View Dependent Claims (19)
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20. A method, comprising:
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repeating an electromagnetic field generated by a transmit antenna circuit, the electromagnetic field having a first region for transferring power, the repeating of the electromagnetic field including creating a second region that is different from the first region with a repeater antenna circuit to transfer power to a receive antenna circuit including a receive antenna disposed within the second region, the repeater antenna circuit including a repeater antenna, a capacitance element operably coupled with the repeater antenna and having a capacitance value and an equivalent series resistance value, and a negative resistance generator operably coupled in series with the capacitance element and coupled to a load; and setting a negative resistance value of the negative resistance generator to at least partially offset the equivalent resistance value and an ohmic resistance of the repeater antenna. - View Dependent Claims (21, 22, 23)
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24. A wireless power transfer system, comprising:
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means for generating an electromagnetic field for transferring power within a region to a receive antenna disposed within the region, the means for generating including a transmit antenna and a capacitance element operably coupled with the transmit antenna, the capacitance element having a capacitance value and an equivalent series resistance value; means, coupled in series with the capacitance element, for setting a negative resistance value to at least partially offset the equivalent resistance value and an ohmic resistance of the transmit antenna; and
means, coupled between the transmit antenna and the means for setting a negative resistance value, for applying a power signal to the transmit antenna. - View Dependent Claims (25)
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26. A wireless power transfer system, comprising:
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means for receiving power via an electromagnetic field generated by a transmit antenna circuit, the electromagnetic field having a region for transferring power, and the means for receiving power including a receive antenna disposed within the region and a capacitance element operably coupled with the receive antenna, the capacitance element having a capacitance value and an equivalent series resistance value; and means, coupled in series with the capacitance element and coupled to a load configured to draw power from the electromagnetic field, for setting a negative resistance value to at least partially offset the equivalent resistance value and an ohmic resistance of the receive antenna. - View Dependent Claims (27)
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28. A wireless power transfer system, comprising:
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means for repeating an electromagnetic field generated by a transmit antenna circuit, the electromagnetic field having a first region for transferring power, the repeating of the electromagnetic field including creating a second region that is different from the first region, to transfer power to a receive antenna circuit including a receive antenna disposed within the second region, the means for repeating including a repeater antenna and a capacitance element operably coupled with the repeater antenna, the capacitance element having a capacitance value and an equivalent series resistance value; and means, coupled in series with the capacitance element and coupled to a load, for setting a negative resistance value to at least partially offset the equivalent resistance value and an ohmic resistance of the repeater antenna. - View Dependent Claims (29, 30, 31)
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Specification