Power Transfer Device, Power Supply Device and Power Receiving Device
First Claim
1. A power transfer device comprising:
- a transformer that couples a primary circuit and a secondary circuit and has a coupling constant of less than one; and
capacitances that are respectively provided in the primary circuit and the secondary circuit, and connected in series with coils that form the transformer, whereincircuit constants of the primary circuit and the secondary circuit are set so that the primary circuit and the secondary circuit resonate at the same frequency and a product of the square of the coupling constant, a Q value of the primary circuit and a Q value of the secondary circuit is one, andthe primary circuit transfers power to the secondary circuit by means of the transformer, using a carrier wave having the resonance frequency.
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Accused Products
Abstract
A power transfer device includes: a transformer that couples a primary circuit and a secondary circuit and has a coupling constant of less than 1; and capacitances that are respectively provided in the primary circuit and the secondary circuit, and connected in series with coils that form the transformer. Circuit constants of the primary circuit and the secondary circuit are set so that the primary circuit and the secondary circuit resonate at the same frequency and a product of the square of the coupling constant, a Q value of the primary circuit and a Q value of the secondary circuit is 1. The primary circuit transfers power to the secondary circuit by means of the transformer, using a carrier wave having the resonance frequency.
29 Citations
13 Claims
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1. A power transfer device comprising:
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a transformer that couples a primary circuit and a secondary circuit and has a coupling constant of less than one; and capacitances that are respectively provided in the primary circuit and the secondary circuit, and connected in series with coils that form the transformer, wherein circuit constants of the primary circuit and the secondary circuit are set so that the primary circuit and the secondary circuit resonate at the same frequency and a product of the square of the coupling constant, a Q value of the primary circuit and a Q value of the secondary circuit is one, and the primary circuit transfers power to the secondary circuit by means of the transformer, using a carrier wave having the resonance frequency. - View Dependent Claims (3, 4, 5, 6, 7)
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2. A power transfer device comprising:
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a first transformer that couples a primary circuit and a secondary circuit and has a coupling constant of less than, one; a second transformer that couples the secondary circuit and a tertiary circuit; and capacitances that are respectively provided in the primary circuit, the secondary circuit and the tertiary circuit, and connected in series with coils that form one of the first transformer and the second transformer, wherein circuit constants of the primary circuit, the secondary circuit and the tertiary circuit are set so that the primary circuit, the secondary circuit and the tertiary circuit resonate at the same frequency and a product of the square of the coupling constant of the first transformer, an inductance and a resistance of the primary circuit is equal to a product of the square of a coupling constant of the second transformer, an inductance and a resistance of the tertiary circuit, and the primary circuit transfers power to the tertiary circuit via the secondary circuit by means of the first transformer and the second transformer, using a carrier wave having the resonance frequency. - View Dependent Claims (8, 9)
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10. A power supply device comprising:
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a primary circuit including a coil that forms a transformer having a coupling constant of less than one with a coil of a power receiving device to be coupled with, the power receiving device having a secondary circuit that includes the coil and a capacitance connected in series, and a capacitance that is connected In series with the coil of the primary circuit, wherein a circuit constant of the primary circuit is set so that the primary circuit and the secondary circuit resonate at the same frequency and a product of the square of the coupling constant, a Q value of the primary circuit and a Q value of the secondary circuit is one, and the primary circuit transfers power to the secondary circuit by means of the transformer, using a carrier wave having the resonance frequency.
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11. A power receiving device comprising:
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a secondary circuit including a coil that forms a transformer having a coupling constant of less than one with a coil of a power supply device to be coupled with, the power supply device having a primary circuit that includes the coil and a capacitance connected in series, and a capacitance that is connected in series with the coil of the secondary circuit, wherein a circuit constant of the secondary circuit is set so that the primary circuit and the secondary circuit resonate at the same frequency and a product of the square of the coupling constant, a Q value of the primary circuit and a Q value of the secondary circuit is one, and the secondary circuit receives power that is transferred from the primary circuit by means of the transformer using a carrier wave having the resonance frequency.
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12. A power supply device comprising:
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a primary circuit including a coil that forms a first transformer having a coupling constant of less than one with a coil of a secondary circuit of a power receiving device to be coupled with, the power receiving device having a secondary circuit and a tertiary circuit that each include a coil and a capacitance connected in series and that are coupled via a second transformer, and a capacitance that is connected in series with the coil of the primary circuit, wherein a circuit constant of the primary circuit is set so that the primary circuit, the secondary circuit and the tertiary circuit resonate at the;
same frequency and a product of the square of the coupling constant of the first transformer, an inductance and a resistance of the primary circuit is equal to a product of the square of the coupling constant of the second transformer, an inductance and a resistance of the tertiary circuit, andthe primary circuit transfers power to the tertiary circuit via the secondary circuit by means of the first transformer and the second transformer, using a carrier wave having the resonance frequency.
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13. A power receiving device comprising:
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a secondary circuit including a first coil that forms a first transformer having a coupling constant of less than one with a coil of a power supply device to be coupled with, the power supply device having a primary circuit that includes the coil and a capacitance connected in series, and a capacitance that is connected in series with the first coil; and a tertiary circuit including a third coil that forms a second transformer with a second coil of the secondary circuit to be coupled with, the second coil being connected in series with the first coil, and a capacitance that Is connected in series with the third coil, wherein circuit constants of the secondary circuit and the tertiary circuit are set so that the primary circuit, the secondary circuit and the tertiary circuit resonate at the same frequency and a product of the square of the coupling constant of the first transformer, an inductance and a resistance of the primary circuit is equal to a product of the square of a coupling constant of the second transformer, an inductance and a resistance of the tertiary circuit, and the tertiary circuit receives power that is transferred from the primary circuit via the secondary circuit by means of the second transformer using a carrier wave having the resonance frequency.
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Specification