METHOD AND APPARATUS WITH NEGATIVE RESISTANCE IN WIRELESS POWER TRANSFERS
First Claim
1. A wireless power-receive circuit, comprising:
- a receive antenna for coupling with a near field radiation at a resonant frequency;
a capacitance element operably coupled in series with the receive antenna and comprising a capacitance value and an equivalent series resistance value;
a negative resistance generator operably coupled in series with the capacitance element and comprising a negative resistance value; and
a load operably coupled in series with the negative resistance generator and for drawing power from the near field radiation when the wireless power-receive circuit oscillates substantially near the resonant frequency.
1 Assignment
0 Petitions
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
28 Claims
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1. A wireless power-receive circuit, comprising:
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a receive antenna for coupling with a near field radiation at a resonant frequency; a capacitance element operably coupled in series with the receive antenna and comprising a capacitance value and an equivalent series resistance value; a negative resistance generator operably coupled in series with the capacitance element and comprising a negative resistance value; and a load operably coupled in series with the negative resistance generator and for drawing power from the near field radiation when the wireless power-receive circuit oscillates substantially near the resonant frequency. - View Dependent Claims (2, 3, 4)
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5. A wireless power-transmit circuit, comprising:
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a transmit antenna for generating a near field radiation at a resonant frequency; a capacitance element operably coupled in series with the transmit antenna and comprising a capacitance value and an equivalent series resistance value; a negative resistance generator operably coupled in series with the capacitance element and comprising a negative resistance value; and a signal generator operably coupled in series with the negative resistance generator and for applying a signal power to the wireless power-transmit circuit such that the wireless power-transmit circuit oscillates substantially near the resonant frequency. - View Dependent Claims (6, 7, 8)
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9. A wireless power-repeater circuit, comprising:
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a repeater antenna for coupling with a near field radiation in a coupling-mode region at a resonant frequency and generating a repeated coupling-mode region different from the coupling-mode region; a capacitance element operably coupled in series with the repeater 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 comprising a negative resistance value. - View Dependent Claims (10, 11, 12)
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13. A method, comprising:
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generating an electromagnetic field at a resonant frequency of a transmit antenna to create a coupling-mode region within a near field of the transmit antenna; and receiving power from the coupling-mode region with a receive antenna disposed within the coupling-mode region, wherein the receive antenna resonates substantially near the resonant frequency; wherein the generating the electromagnetic field includes setting a negative resistance value of a transmit component of the transmit antenna to offset at least some of an equivalent series resistance value of other transmit components of the transmit antenna. - View Dependent Claims (14)
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15. A method, comprising:
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generating an electromagnetic field at a resonant frequency of a transmit antenna to create a coupling-mode region within a near field of the transmit antenna; and receiving power from the coupling-mode region with a receive antenna disposed within the coupling-mode region, wherein the receive antenna resonates substantially near the resonant frequency; wherein the receiving power from the coupling-mode region includes setting a negative resistance value of a receive component of the receive antenna to offset at least some of an equivalent series resistance value of other receive components of the receive antenna. - View Dependent Claims (16)
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17. A method, comprising:
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generating an electromagnetic field at a resonant frequency of a transmit antenna to create a coupling-mode region within a near field of the transmit antenna; repeating the electromagnetic field to create a repeated coupling-mode region different from the coupling-mode region with a repeater antenna; and receiving power from the repeated coupling-mode region with a receive antenna disposed within the coupling-mode region, wherein the receive antenna resonates substantially near the resonant frequency; wherein the generating the electromagnetic field includes setting a negative resistance value of a transmit component of the transmit antenna to offset at least some of an equivalent series resistance value of other transmit components of the transmit antenna. - View Dependent Claims (18, 19, 20)
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21. A wireless power transfer system, comprising:
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a means for generating an electromagnetic field at a resonant frequency of a transmit antenna to create a coupling-mode region within a near field of the transmit antenna; and a means for receiving power from the coupling-mode region with a receive antenna disposed within the coupling-mode region, wherein the receive antenna resonates substantially near the resonant frequency; wherein the means for generating the electromagnetic field includes a means for setting a negative resistance value of a transmit component of the transmit antenna to offset at least some of an equivalent series resistance value of other transmit components of the transmit antenna. - View Dependent Claims (22)
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23. A wireless power transfer system, comprising:
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a means for generating an electromagnetic field at a resonant frequency of a transmit antenna to create a coupling-mode region within a near field of the transmit antenna; and a means for receiving power from the coupling-mode region with a receive antenna disposed within the coupling-mode region, wherein the receive antenna resonates substantially near the resonant frequency; wherein the means for receiving power from the coupling-mode region includes a means for setting a negative resistance value of a receive component of the receive antenna to offset at least some of an equivalent series resistance value of other receive components of the receive antenna. - View Dependent Claims (24)
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25. A wireless power transfer system, comprising:
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a means for generating an electromagnetic field at a resonant frequency of a transmit antenna to create a coupling-mode region within a near field of the transmit antenna; a means for repeating the electromagnetic field to create a repeated coupling-mode region different from the coupling-mode region with a repeater antenna; and a means for receiving power from the repeated coupling-mode region with a receive antenna disposed within the repeated coupling-mode region, wherein the receive antenna resonates substantially near the resonant frequency; wherein the means for generating the electromagnetic field includes a means for setting a negative resistance value of a transmit component of the transmit antenna to offset at least some of an equivalent series resistance value of other transmit components of the transmit antenna. - View Dependent Claims (26, 27, 28)
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Specification