Wireless power transmission system
First Claim
1. A wireless power transmission apparatus comprising:
- a transmitting antenna configured to magnetically couple and resonate with a receiving antenna included in a power receiving apparatus at a resonant frequency (f0) that falls within a first frequency range extending from a minimum transmission frequency (ftrmin) to a maximum transmission frequency (ftrmax), wherein one of the transmitting antenna and the receiving antenna is a series resonant circuit, and the other of the transmitting antenna and the receiving antenna is a parallel resonant circuit; and
a control circuit configured to control a transmission frequency within the first frequency range according to a magnitude of electric power to be transmitted from the transmitting antenna to the receiving antenna,wherein when the transmitting antenna magnetically couples and resonates with the receiving antenna at the resonant frequency f0, the resonant frequency f0 splits into a first resonant frequency (fL) being lower than the resonant frequency (f0) and a second resonant frequency (fH) being higher than the resonant frequency (f0),wherein if the magnitude of the electric power to be transmitted is greater than a reference magnitude, the control circuit sets the transmission frequency to be a value that falls within a second frequency range extending from the resonant frequency (f0) to the maximum transmission frequency (ftrmax), andwherein if the magnitude of the electric power to be transmitted is smaller than the reference magnitude, the control circuit sets the transmission frequency to be a value that falls within a third frequency range extending from the minimum transmission frequency (ftrmin) to the resonant frequency (f0).
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Abstract
A wireless power transmission system according to the present disclosure includes: a pair of antennas, between which power is transmissible wirelessly by resonant magnetic coupling at a frequency f0, one of which is a series resonant circuit, and the other of which is a parallel resonant circuit; and a control section, which controls a transmission frequency according to the magnitude of the power being transmitted between the antennas. If the power transmitted between the antennas is greater than a reference value P1, the control section sets the transmission frequency to be a value that falls within a first level range that is higher than the frequency f0. But if the power is smaller than the reference value P1, then the control section sets the transmission frequency to be a value that falls within a second level range that is lower than the first level range.
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Citations
11 Claims
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1. A wireless power transmission apparatus comprising:
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a transmitting antenna configured to magnetically couple and resonate with a receiving antenna included in a power receiving apparatus at a resonant frequency (f0) that falls within a first frequency range extending from a minimum transmission frequency (ftrmin) to a maximum transmission frequency (ftrmax), wherein one of the transmitting antenna and the receiving antenna is a series resonant circuit, and the other of the transmitting antenna and the receiving antenna is a parallel resonant circuit; and a control circuit configured to control a transmission frequency within the first frequency range according to a magnitude of electric power to be transmitted from the transmitting antenna to the receiving antenna, wherein when the transmitting antenna magnetically couples and resonates with the receiving antenna at the resonant frequency f0, the resonant frequency f0 splits into a first resonant frequency (fL) being lower than the resonant frequency (f0) and a second resonant frequency (fH) being higher than the resonant frequency (f0), wherein if the magnitude of the electric power to be transmitted is greater than a reference magnitude, the control circuit sets the transmission frequency to be a value that falls within a second frequency range extending from the resonant frequency (f0) to the maximum transmission frequency (ftrmax), and wherein if the magnitude of the electric power to be transmitted is smaller than the reference magnitude, the control circuit sets the transmission frequency to be a value that falls within a third frequency range extending from the minimum transmission frequency (ftrmin) to the resonant frequency (f0). - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A wireless power transmission system comprising a power transmitting apparatus and a power receiving apparatus comprising a receiving antenna, the power transmitting apparatus comprising:
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a transmitting antenna configured to magnetically couple and resonate with the receiving antenna included in the power receiving apparatus at a resonant frequency (f0) that falls within a first frequency range extending from a minimum transmission frequency (ftrmin) to a maximum transmission frequency (ftrmax), wherein one of the transmitting antenna and the receiving antenna is a series resonant circuit, and the other of the transmitting antenna and the receiving antenna is a parallel resonant circuit; and a control circuit configured to control a transmission frequency within the first frequency range according to a magnitude of electric power to be transmitted from the transmitting antenna to the receiving antenna, wherein when the transmitting antenna magnetically couples and resonates with the receiving antenna at the resonant frequency f0, the resonant frequency f0 splits into a first resonant frequency (fL) being lower than the resonant frequency (f0) and a second resonant frequency (fH) being higher than the resonant frequency (f0), wherein if the magnitude of the electric power to be transmitted is greater than a reference magnitude, the control circuit sets the transmission frequency to be a value that falls within a second frequency range extending from the resonant frequency (f0) to the maximum transmission frequency (ftrmax), and wherein if the magnitude of the electric power to be transmitted is smaller than the reference magnitude, the control circuit sets the transmission frequency to be a value that falls within a third frequency range extending from the minimum transmission frequency (ftrmin) to the resonant frequency (f0). - View Dependent Claims (9, 10, 11)
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Specification