WIRELESS POWER TRANSMISSION SYSTEM
First Claim
1. A wireless power transmission system for transmitting power over a resonant magnetic field, the system comprising a power-transmitting resonator and a power-receiving resonator,wherein at least one of the power-transmitting resonator and the power-receiving resonator is a series resonant circuit, andwherein the series resonant circuit includes:
- an inductor including spiral wiring and first, second and third extended wires, the first extended wire connecting a first connection point of the spiral wiring to a power supplying structure, the second extended wire connecting a second connection point of the spiral wiring, which is different from the first connection point, to the power supplying structure, the third extended wire connecting a third connection point of the spiral wiring, which is more distant from the first connection point than the second connection point is, to the power supplying structure;
multiple switches, two of which are connected to the second and third extended wires, respectively; and
multiple capacitors, each of which is connected in series to a corresponding one of the second and third extended wires by way of a corresponding one of the switches,wherein the series resonant circuit has an inductance varied according to which current path has been chosen by selectively turning ON one of the switches, andwherein the capacitances of the capacitors are defined so that the series resonant circuit has a substantially same resonant frequency irrespective of what switch has been turned ON selectively, andwherein the spiral wiring has a low-resistance portion, which is located in a range from the second connection point through the first connection point and of which the wiring resistance per unit length at the resonant frequency is set to be lower than in at least a part of the other range of the spiral wiring.
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Accused Products
Abstract
The wireless power transmission system of this invention transmits power over a resonant magnetic field. The system includes a power-transmitting resonator 105 and a power-receiving resonator 107, at least one of which is a series resonant circuit with an inductor including spiral wiring 201 and extended wires 213, 207a, 207b and 207c. The extended wire 213 connects a point 203 of the spiral wiring 201 to a power supplying structure, while the extended wires 207a, 207b and 207c connect other points of the spiral wiring 201 to the power supplying structure. Capacitors 209a, 209b and 209c and switches 211a, 211b and 211c are connected to the extended wires 207a, 207b and 207c, respectively. The series resonant circuit has its inductance varied according to which current path has been chosen by selectively turning ON one of the switches. A wiring portion 201a of the spiral wiring 201 has a low-resistance portion 2010, of which the wiring resistance per unit length at a resonant frequency is set to be lower than in at least a part of the rest of the spiral wiring.
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Citations
20 Claims
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1. A wireless power transmission system for transmitting power over a resonant magnetic field, the system comprising a power-transmitting resonator and a power-receiving resonator,
wherein at least one of the power-transmitting resonator and the power-receiving resonator is a series resonant circuit, and wherein the series resonant circuit includes: -
an inductor including spiral wiring and first, second and third extended wires, the first extended wire connecting a first connection point of the spiral wiring to a power supplying structure, the second extended wire connecting a second connection point of the spiral wiring, which is different from the first connection point, to the power supplying structure, the third extended wire connecting a third connection point of the spiral wiring, which is more distant from the first connection point than the second connection point is, to the power supplying structure; multiple switches, two of which are connected to the second and third extended wires, respectively; and multiple capacitors, each of which is connected in series to a corresponding one of the second and third extended wires by way of a corresponding one of the switches, wherein the series resonant circuit has an inductance varied according to which current path has been chosen by selectively turning ON one of the switches, and wherein the capacitances of the capacitors are defined so that the series resonant circuit has a substantially same resonant frequency irrespective of what switch has been turned ON selectively, and wherein the spiral wiring has a low-resistance portion, which is located in a range from the second connection point through the first connection point and of which the wiring resistance per unit length at the resonant frequency is set to be lower than in at least a part of the other range of the spiral wiring. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19)
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20. A wireless power transmission unit comprising one of a power-transmitting resonator and a power-receiving resonator and transmitting or receiving power to/from the other resonator over a resonant magnetic field,
wherein the unit comprises a series resonant circuit that functions as the power-transmitting resonator or the power-receiving resonator, and wherein the series resonant circuit includes: -
an inductor including spiral wiring and first, second and third extended wires, the first extended wire connecting a first connection point of the spiral wiring to a power supplying structure, the second extended wire connecting a second connection point of the spiral wiring, which is different from the first connection point, to the power supplying structure, the third extended wire connecting a third connection point of the spiral wiring, which is more distant from the first connection point than the second connection point is, to the power supplying structure; multiple switches, two of which are connected to the second and third extended wires, respectively; and multiple capacitors, each of which is connected in series to a corresponding one of the second and third extended wires by way of a corresponding one of the switches, wherein the series resonant circuit has its inductance varied according to which current path has been chosen by selectively turning ON one of the switches, and wherein the capacitances of the capacitors are defined so that the series resonant circuit has a substantially same resonant frequency irrespective of what switch has been turned ON selectively, and wherein the spiral wiring has a low-resistance portion, which is located in a range from the second connection point through the first connection point and of which the wiring resistance per unit length at the resonant frequency is set to be lower than in at least a part of the other range of the spiral wiring.
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Specification