Charging device having small loop transmission coils for wireless charging a target device
First Claim
1. A charging device to wirelessly charge a target device, comprising:
- a coil antenna having a first surface facing a first direction at which the target device is placed for charging and a second surface facing an opposite direction from the first direction, generating a first magnetic field;
a plurality of pairs of metallic small loop transmission coils arranged to the second surface side of the coil antenna, to generate a second magnetic field in response to the first magnetic field to enhance the first magnetic field, the first and second magnetic fields being directed in the first direction; and
wherein a first one of each pair of metallic small loop transmission coils is coupled to a second one of the pair in parallel and a size of the first one of each pair is different from that of the second one of the pair, such that when a distance between the target device and the first surface is changed, one of the pair of metallic small loop transmission coils is enabled to be resonant with the coil antenna, andwherein inductance and capacitance values, for each metallic small loop transmission coil, with a number of turns N, turn width W, spacing between turn S, inner diameter D1, outer diameter D2, inductance L, capacitance C, and frequency f, the inductance Lloop and capacitance Ctotal are determined by formula (1) below;
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Accused Products
Abstract
A charging device to wirelessly charge a target device, including: a coil antenna having a first surface facing a first direction at which the target device is placed for charging and a second surface facing an opposite direction from the first direction, generating a first magnetic field; a plurality of pairs of metallic small loop transmission coils arranged to the second surface side of the coil antenna, to generate a second magnetic field in response to the first magnetic field to enhance the first magnetic field, the first and second magnetic fields being directed in the first direction; and wherein a first one of each pair of metallic small loop transmission coils is coupled to a second one of the pair in parallel and a size of the first one of each pair is different from that of the second one of the pair, such that when a distance between the target device and the first surface is changed, one of the pair of metallic small loop transmission coils is enabled to be resonant with the coil antenna.
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Citations
18 Claims
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1. A charging device to wirelessly charge a target device, comprising:
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a coil antenna having a first surface facing a first direction at which the target device is placed for charging and a second surface facing an opposite direction from the first direction, generating a first magnetic field; a plurality of pairs of metallic small loop transmission coils arranged to the second surface side of the coil antenna, to generate a second magnetic field in response to the first magnetic field to enhance the first magnetic field, the first and second magnetic fields being directed in the first direction; and wherein a first one of each pair of metallic small loop transmission coils is coupled to a second one of the pair in parallel and a size of the first one of each pair is different from that of the second one of the pair, such that when a distance between the target device and the first surface is changed, one of the pair of metallic small loop transmission coils is enabled to be resonant with the coil antenna, and wherein inductance and capacitance values, for each metallic small loop transmission coil, with a number of turns N, turn width W, spacing between turn S, inner diameter D1, outer diameter D2, inductance L, capacitance C, and frequency f, the inductance Lloop and capacitance Ctotal are determined by formula (1) below; - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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13. A method of wirelessly charging a target device, comprising:
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generating a first magnetic field from a second surface of a coil antenna, the coil antenna having a first surface facing a first direction at which the target device is placed for charging and the second surface facing an opposite direction from the first direction; and generating a second magnetic field using a plurality of pairs of metallic small loop transmission coils arranged to the second surface side of the coil antenna in response to the first magnetic field, the first and second magnetic fields being directed in the first direction; wherein a first one of each pair of metallic small loop transmission coils is coupled to a second one of the pair in parallel and a size of the first one of each pair is different from that of the second one of the pair, such that when a distance between the target device and the first surface is changed, one of the pair of metallic small loop transmission coils is enabled to be resonant with the coil antenna wherein capacitors are respectively connected to each small loop transmission coil in series, and wherein inductance and capacitance values, for each metallic small loop transmission coil, with a number of turns N, turn width W, spacing between turn S, inner diameter D1, outer diameter D2, inductance L, capacitance C, and frequency f, the inductance Lloop and capacitance Ctotal are determined by formula (1) below; - View Dependent Claims (14, 15, 16, 17)
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18. A method of designing a charging device to wirelessly charge a target device, comprising:
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a coil antenna having a first surface facing a first direction at which the target device is placed for charging and a second surface facing an opposite direction from the first direction, generating a first magnetic field; a plurality of pairs of metallic small loop transmission coils arranged to the second surface side of the coil antenna, to generate a second magnetic field in response to the first magnetic field to enhance the first magnetic field, the first and second magnetic fields being directed in the first direction; and wherein a first one of each pair of metallic small loop transmission coils is coupled to a second one of the pair in parallel and a size of the first one of each pair is different from that of the second one of the pair, such that when a distance between the target device and the first surface is changed, one of the pair of metallic small loop transmission coils is enabled to be resonant with the coil antenna, the method comprising; determining inductance and capacitance values, for each metallic small loop transmission coil, with a number of turns N, turn width W, spacing between turn S, inner diameter D1, outer diameter D2, inductance L, capacitance C, and frequency tf, the inductance Lloop and capacitance Ctotal by formulae (1) and (2) below;
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Specification