Wireless power transmission system for free-position wireless charging of multiple devices
First Claim
1. A wireless power transfer system for transmitting and receiving power between a transmitting coil of a transmitter and a receiving coil of a receiver via magnetic coupling, wherein:
- the transmitting coil and the receiving coil are configured such that center positions thereof are arranged at horizontally different positions to implement wireless power transfer in a way of horizontally free positioning, and are configured to transmit and receive power in a wireless manner via a uniform mutual inductance within a preset range between the transmitting coil and the receiving coil,wherein the preset range satisfies the equation
(MaxMI−
MinMI)/MaxMI<
0.2,wherein MaxMI is a maximum mutual inductance of the preset range and MinMI is a minimum mutual inductance of the preset range.
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Accused Products
Abstract
The present invention relates to a near-field wireless power transfer system capable of having a constant efficiency regardless of a charging position of a receiver by only using a simple impedance matching circuit without using a separate existing complex adaptive impedance matching circuit or control circuit, and simultaneously transmitting power without having difficulty with impedance matching even for wireless power transmission to a plurality of electronic devices by applying a wireless power transmitter with a transmitting coil having a structure to generate a uniform mutual inductance between the transmitting coil of the wireless power transmitter and a receiver coil of each of the plurality of electronic devices.
21 Citations
39 Claims
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1. A wireless power transfer system for transmitting and receiving power between a transmitting coil of a transmitter and a receiving coil of a receiver via magnetic coupling, wherein:
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the transmitting coil and the receiving coil are configured such that center positions thereof are arranged at horizontally different positions to implement wireless power transfer in a way of horizontally free positioning, and are configured to transmit and receive power in a wireless manner via a uniform mutual inductance within a preset range between the transmitting coil and the receiving coil, wherein the preset range satisfies the equation
(MaxMI−
MinMI)/MaxMI<
0.2,wherein MaxMI is a maximum mutual inductance of the preset range and MinMI is a minimum mutual inductance of the preset range. - View Dependent Claims (2, 3, 4, 5)
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6. A coil assembly, comprising:
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a first coil part through which current flows in a direction of input current applied from a first end of the coil assembly, the first coil part being disposed between the first end and a second end of the coil assembly; and a second coil part connected to the first coil part through which current flows in the direction of the input current, the second coil part being concentrically formed with the first coil part and configured such that current flows in a direction opposite to that of the input current, wherein the coil assembly transfers wireless power depending on mutual inductance with respective target coils, relative center positions of which are horizontally different from each other. - View Dependent Claims (7, 8, 9, 10, 11, 12, 13, 14)
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15. A coil assembly, comprising:
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a coil part through which current flows in a direction of input current applied from a first end of the coil assembly, the coil part being disposed between the first end and a second end of the coil assembly, wherein the coil part comprises; a first coil part concentrically wound one or more times towards a center thereof so that current flows in a direction of the input current; and a second coil part, a center of which is aligned with that of the first coil part and in which two or more coils are connected in parallel and are concentrically wound so that current flows in the direction of the input current, and wherein the coil assembly transfers wireless power via magnetic coupling with respective target coils, relative center positions of which are horizontally different from each other. - View Dependent Claims (16, 17, 18, 19)
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20. A wireless power transfer system for transmitting/receiving power between a transmitting coil of a transmitter and a receiving coil of a receiver via magnetic coupling, wherein the transmitting coil or the receiving coil comprises:
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a first coil part concentrically wound one or more times towards a center thereof so that current flows in a direction of an input current applied from a first end of the transmitting coil or the receiving coil, the first coil part being disposed between the first end and a second end of the transmitting coil or the receiving coil; and a coil part A connected to the first coil part in which the current flows in the direction of the input current, the coil part A having a center aligned with that of the first coil part and being concentrically arranged with the first coil part, the coil part A being configured such that, in the coil part A, current flows in a direction opposite to that of the input current;
ora coil part B having a center aligned with that of the first coil part, the coil part B being configured such that two or more coils are connected in parallel and are concentrically wound so that, in the coil part B, current flows in a same direction of the input current, wherein the transmitting coil transmits power to one or more receiving coils, relative center positions of which are horizontally different from each other. - View Dependent Claims (21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39)
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Specification