Three-Coil Topology for Wireless Power Transfer
First Claim
1. A power-transmitting unit configured to wirelessly transmit power in a wireless power transfer system, the power-transmitting unit comprising:
- an alternating-current (AC) power source;
a primary resonator comprising a primary coil, the primary resonator being electrically coupled to the power source such that a primary-coil current flows through the primary coil when the primary resonator is excited by the power source; and
a repeater resonator comprising a repeater coil end-to-end adjacent to the primary coil, the repeater resonator being electrically isolated from the power source, wherein the repeater coil and the primary coil are separated by a distance selected, and the repeater coil is configured, to amplify the primary-coil current by inductively generating a repeater-coil current that flows through the repeater coil and that is substantially greater than the primary-coil current;
so that when wirelessly transmitting the power, the power-transmitting unit generates a magnetic field for wireless power transfer with contribution from both the primary-coil current and the repeater-coil current while the power source is not required to provide a terminal voltage across the repeater coil to sustain the receiver-coil current, which is a current substantially greater than the primary-coil current, thereby discouraging occurrence of voltage stress at the power source.
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Accused Products
Abstract
A system using a three-coil topology for wireless power transfer is disclosed. The system comprises a primary resonator coupled to a power source, a repeater resonator and a receiver resonator. The primary resonator has a primary coil, and the repeater resonator has a repeater coil adjacent to the primary coil. The repeater coil and the primary coil are separated by a distance selected, and the repeater coil is configured, to amplify a primary-coil current by inductively generating a repeater-coil current that is substantially greater than the primary-coil current. A magnetic field contributed from both the primary-coil current and the repeater-coil current is generated while the power source needs not provide a terminal voltage across the repeater coil, thereby discouraging occurrence of voltage stress at the power source. The receiver resonator has a receiver coil, which receives the magnetic field to inductively generate a receiver-coil current for feeding to a load.
20 Citations
20 Claims
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1. A power-transmitting unit configured to wirelessly transmit power in a wireless power transfer system, the power-transmitting unit comprising:
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an alternating-current (AC) power source; a primary resonator comprising a primary coil, the primary resonator being electrically coupled to the power source such that a primary-coil current flows through the primary coil when the primary resonator is excited by the power source; and a repeater resonator comprising a repeater coil end-to-end adjacent to the primary coil, the repeater resonator being electrically isolated from the power source, wherein the repeater coil and the primary coil are separated by a distance selected, and the repeater coil is configured, to amplify the primary-coil current by inductively generating a repeater-coil current that flows through the repeater coil and that is substantially greater than the primary-coil current; so that when wirelessly transmitting the power, the power-transmitting unit generates a magnetic field for wireless power transfer with contribution from both the primary-coil current and the repeater-coil current while the power source is not required to provide a terminal voltage across the repeater coil to sustain the receiver-coil current, which is a current substantially greater than the primary-coil current, thereby discouraging occurrence of voltage stress at the power source. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
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14. A method for wirelessly transmitting power from a transmitting side to a receiving side, the transmitting side having a primary resonator, a repeater resonator and an alternating-current (AC) power source, the primary resonator comprising a primary coil, the repeater resonator comprising a repeater coil, the receiving side having a receiver resonator which comprises a receiver coil, the method comprising:
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positioning the primary coil to be end-to-end adjacent to the repeater coil; electrically isolating the repeater resonator from the power source; exciting the primary resonator by the power source to generate a primary-coil current flowing through the primary coil; selecting a distance between the repeater coil and the primary coil such that the primary-coil current inductively generates a repeater-coil current that flows through the repeater coil and that is substantially greater than the primary-coil current, so that the transmitting side is enabled to generate a magnetic field with contribution from both the primary-coil current and the repeater-coil current while the power source is not required to provide a terminal voltage across the repeater coil to sustain the repeater-coil current, which is a current substantially greater than the primary-coil current, to thereby discourage occurrence of voltage stress at the power source; and receiving the magnetic field by the receiver coil so as to inductively generate a receiver current that flows through the receiver coil for feeding to a load at the receiving side. - View Dependent Claims (15, 16, 17, 18, 19, 20)
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Specification