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 when the transmitting antenna is a series resonant circuit, the receiving antenna is a parallel resonant circuit, and when the receiving antenna is a series resonant circuit, the transmitting antenna is a parallel resonant circuit; and
a control circuit configured to control a transmission frequency according to a magnitude of electric power to be transmitted from the transmitting antenna to the receiving antenna, a first magnitude of electric power associated with the maximum transmission frequency (ftrmax) being higher than a second magnitude of electric power associated with the resonant frequency (f0), the second magnitude being higher than a third magnitude of electric power associated with the minimum transmission frequency (ftrmin),wherein if the magnitude of the electric power to be transmitted is greater than the second magnitude, the control circuit selects the transmission frequency within a second frequency range extending from the resonant frequency (f0) to the maximum transmission frequency (ftrmax),wherein if the magnitude of the electric power to be transmitted is smaller than the second magnitude, the control circuit selects the transmission frequency within a third frequency range extending from the minimum transmission frequency (ftrmin) to the resonant frequency (f0),wherein when the transmitting antenna magnetically couples and resonates with the receive antenna at the resonant frequency f0, the resonant frequency f0 splits into a resonant frequency (fL) of an odd mode and a resonant frequency (fH) of an even mode being higher than the resonant frequency (fL), andwherein the split resonant frequency (fL) is lower than the transmission frequency (ftrmin) and the split resonant frequency (fH) is higher than the transmission frequency (ftrmax).
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Accused Products
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
10 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 when the transmitting antenna is a series resonant circuit, the receiving antenna is a parallel resonant circuit, and when the receiving antenna is a series resonant circuit, the transmitting antenna is a parallel resonant circuit; and a control circuit configured to control a transmission frequency according to a magnitude of electric power to be transmitted from the transmitting antenna to the receiving antenna, a first magnitude of electric power associated with the maximum transmission frequency (ftrmax) being higher than a second magnitude of electric power associated with the resonant frequency (f0), the second magnitude being higher than a third magnitude of electric power associated with the minimum transmission frequency (ftrmin), wherein if the magnitude of the electric power to be transmitted is greater than the second magnitude, the control circuit selects the transmission frequency within a second frequency range extending from the resonant frequency (f0) to the maximum transmission frequency (ftrmax), wherein if the magnitude of the electric power to be transmitted is smaller than the second magnitude, the control circuit selects the transmission frequency within a third frequency range extending from the minimum transmission frequency (ftrmin) to the resonant frequency (f0), wherein when the transmitting antenna magnetically couples and resonates with the receive antenna at the resonant frequency f0, the resonant frequency f0 splits into a resonant frequency (fL) of an odd mode and a resonant frequency (fH) of an even mode being higher than the resonant frequency (fL), and wherein the split resonant frequency (fL) is lower than the transmission frequency (ftrmin) and the split resonant frequency (fH) is higher than the transmission frequency (ftrmax). - 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 when the transmitting antenna is a series resonant circuit, the receiving antenna is a parallel resonant circuit, and when the receiving antenna is a series resonant circuit, the transmitting antenna is a parallel resonant circuit; and a control circuit configured to control a transmission frequency according to a magnitude of electric power to be transmitted from the transmitting antenna to the receiving antenna, a first magnitude of electric power associated with the maximum transmission frequency (ftrmax) being higher than a second magnitude of electric power associated with the resonant frequency (f0), the second magnitude being higher than a third magnitude of electric power associated with the minimum transmission frequency (ftrmin), wherein if the magnitude of the electric power to be transmitted is greater than the second magnitude, the control circuit selects the transmission frequency within a second frequency range extending from the resonant frequency (f0) to the maximum transmission frequency (ftrmax), wherein if the magnitude of the electric power to be transmitted is smaller than the second magnitude, the control circuit selects the transmission frequency within a third frequency range extending from the minimum transmission frequency (ftrmin) to the resonant frequency (f0), wherein when the transmitting antenna magnetically couples and resonates with the receive antenna at the resonant frequency f0, the resonant frequency f0 splits into a resonant frequency (fL) of an odd mode and a resonant frequency (fH) of an even mode being higher than the resonant frequency (fL), and wherein the split resonant frequency (fL) is lower than the transmission frequency (ftrmin) and the split resonant frequency (fH) is higher than the transmission frequency (ftrmax).
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9. 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 when the transmitting antenna is a series resonant circuit, the receiving antenna is a parallel resonant circuit, and when the receiving antenna is a series resonant circuit, the transmitting antenna is a parallel resonant circuit; a control circuit configured to control a transmission frequency according to a magnitude of electric power to be transmitted from the transmitting antenna to the receiving antenna, a first magnitude of electric power associated with the maximum transmission frequency (ftrmax) being higher than a second magnitude of electric power associated with the resonant frequency (f0), the second magnitude being higher than a third magnitude of electric power associated with the minimum transmission frequency (ftrmin); and an oscillator to which the control circuit sets the transmission frequency and which adjusts the magnitude of the electric power to be transmitted from the transmitting antenna, wherein if the magnitude of the electric power to be transmitted is greater than the second magnitude, the control circuit selects the transmission frequency within a second frequency range extending from the resonant frequency (f0) to the maximum transmission frequency (ftrmax), wherein if the magnitude of the electric power to be transmitted is smaller than the second magnitude, the control circuit selects the transmission frequency within a third frequency range extending from the minimum transmission frequency (ftrmin) to the resonant frequency (f0), and wherein when the power receiving apparatus is activated, an input impedance Zin of the transmitting antenna is equal to an output impedance Zoc of the oscillator.
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10. 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 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 when the transmitting antenna is a series resonant circuit, the receiving antenna is a parallel resonant circuit, and when the receiving antenna is a series resonant circuit, the transmitting antenna is a parallel resonant circuit; a control circuit configured to control a transmission frequency according to a magnitude of electric power to be transmitted from the transmitting antenna to the receiving antenna, a first magnitude of electric power associated with the maximum transmission frequency (ftrmax) being higher than a second magnitude of electric power associated with the resonant frequency (f0), the second magnitude being higher than a third magnitude of electric power associated with the minimum transmission frequency (ftrmin); and an oscillator to which the control circuit sets the transmission frequency and which adjusts the magnitude of the electric power to be transmitted from the transmitting antenna, wherein if the magnitude of the electric power to be transmitted is greater than the second magnitude, the control circuit selects the transmission frequency within a second frequency range extending from the resonant frequency (f0) to the maximum transmission frequency (ftrmax), wherein if the magnitude of the electric power to be transmitted is smaller than the second magnitude, the control circuit selects the transmission frequency within a third frequency range extending from the minimum transmission frequency (ftrmin) to the resonant frequency (f0), and wherein when the power receiving apparatus is activated, an input impedance Zin of the transmitting antenna is equal to an output impedance Zoc of the oscillator.
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Specification