Planar spiral induction coil having increased quality (Q)-factor and method for designing planar spiral induction coil
First Claim
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1. A planar spiral induction coil comprising:
- a strip-shaped coil having at least one turn, the at least one turn having a width that changes as a distance from a beginning of the strip-shaped coil increases in a length direction of the strip-shaped coil,wherein each turn of the at least one turn has a respective width that causes an equal current to flow through each turn of the at least one turn, andwherein a shape of each turn of the at least one turn is a torus having a rectangular portion connecting between turns having different widths.
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Abstract
A planar spiral induction coil includes a strip-shaped coil having at least one turn. The at least one turn has a width that changes as a distance from a beginning of the strip-shaped coil increases in a length direction of the strip-shaped coil. Each turn of the at least one turn has a respective width that causes an equal current to flow through each turn of the at least one turn.
4 Citations
19 Claims
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1. A planar spiral induction coil comprising:
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a strip-shaped coil having at least one turn, the at least one turn having a width that changes as a distance from a beginning of the strip-shaped coil increases in a length direction of the strip-shaped coil, wherein each turn of the at least one turn has a respective width that causes an equal current to flow through each turn of the at least one turn, and wherein a shape of each turn of the at least one turn is a torus having a rectangular portion connecting between turns having different widths. - View Dependent Claims (2, 3, 4, 5)
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6. A wireless power transmitter comprising:
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a source resonator configured to transmit wireless power to a wireless power receiver via resonance with a target resonator of the wireless power receiver, and comprising a planar spiral induction coil, the planar spiral induction coil comprising a strip-shaped coil having at least one turn, the at least one turn having a width that changes as a distance from a beginning of the strip-shaped coil increases in a length direction of the strip-shaped coil; and a power supply configured to supply power to the source resonator, wherein each turn of the at least one turn has a respective width that causes an equal current to flow through each turn of the at least one turn, and wherein a shape of each turn of the at least one turn is a torus having a rectangular portion connecting between turns having different widths.
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7. A wireless power receiver comprising:
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a target resonator configured to receive wireless power from a wireless power transmitter via resonance with a source resonator of the wireless power transmitter, and comprising a planar spiral induction coil, the planar spiral induction coil comprising a strip-shaped coil having at least one turn, the at least one turn having a width that changes as a distance from a beginning of the strip-shaped coil increases in a length direction of the strip-shaped coil; and a load configured to receive power from the target resonator, wherein each turn of the at least one turn has a respective width that causes an equal current to flow through each turn of the at least one turn, and wherein a shape of each turn of the at least one turn is a torus having a rectangular portion connecting between turns having different widths.
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8. A method of designing a planar spiral induction coil, the method comprising:
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setting a number of turns of at least one turn in a strip-shaped coil included in the planar spiral induction coil, the at least one turn having a width that changes as a distance from a beginning of the strip-shaped coil increases in a length direction of the strip-shaped coil; and determining a respective width of each turn of the at least one turn so that an equal current flows through each turn of the at least one turn and, wherein a shape of each turn of the at least one turn is a torus having a rectangular portion connecting between turns having different widths. - View Dependent Claims (9, 10, 11, 12, 13, 14)
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15. A planar spiral induction coil comprising:
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a planar coil having at least one turn, wherein each turn of the at least one turn has a respective width that is different from a respective width of every other turn of the at least one turn and causes an equal current to flow through each turn of the at least one turn, and wherein a shape of each turn of the at least one turn is a torus having a rectangular portion connecting between turns having different widths. - View Dependent Claims (16, 17, 18, 19)
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Specification