Wireless power transmission system
First Claim
1. A wireless power transmission system for feeding power by wireless from a feeding coil to a receiving coil, comprising:
- the feeding coil;
a transmission control circuit that supplies AC power to the feeding coil at a drive frequency so as to make the feeding coil feed the AC power to the receiving coil;
the receiving coil;
a loading circuit that receives power from the receiving coil; and
a magnetic body that is disposed between the feeding coil and receiving coil, the magnetic body being disposed inside a space between coil surfaces of the feeding coil and receiving coil,wherein the magnetic body is disposed so that a coil axis connecting a central axis of the feeding coil and a central axis of the receiving coil passes through the magnetic body, andwherein the magnetic body is configured such that, during power transmission from the feeding coil to the receiving coil, the magnetic body does not move.
1 Assignment
0 Petitions
Accused Products
Abstract
To improve power transmission efficiency in wireless power feeding by using a magnetic body. A wireless power transmission system 100 feeds power by wireless from a feeding coil L2 to a receiving coil L3 based on a magnetic-field resonance phenomenon between the feeding coil L2 and receiving coil L3. A transmission control circuit 200 supplies AC power to the feeding coil L2 at a drive frequency so as to make the feeding coil L2 feed the AC power to the receiving coil L3. A magnetic body F is disposed between the feeding coil L2 and receiving coil L3. The magnetic body F is disposed in a space between coil surfaces of the feeding coil L2 and receiving coil L3.
27 Citations
11 Claims
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1. A wireless power transmission system for feeding power by wireless from a feeding coil to a receiving coil, comprising:
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the feeding coil; a transmission control circuit that supplies AC power to the feeding coil at a drive frequency so as to make the feeding coil feed the AC power to the receiving coil; the receiving coil; a loading circuit that receives power from the receiving coil; and a magnetic body that is disposed between the feeding coil and receiving coil, the magnetic body being disposed inside a space between coil surfaces of the feeding coil and receiving coil, wherein the magnetic body is disposed so that a coil axis connecting a central axis of the feeding coil and a central axis of the receiving coil passes through the magnetic body, and wherein the magnetic body is configured such that, during power transmission from the feeding coil to the receiving coil, the magnetic body does not move. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A wireless power transmission system for feeding power by wireless from a feeding coil to a receiving coil, comprising:
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the feeding coil; a transmission control circuit that supplies AC power to the feeding coil at a drive frequency so as to make the feeding coil feed the AC power to the receiving coil; the receiving coil; a loading circuit that receives power from the receiving coil; a magnetic body that is disposed between the feeding coil and receiving coil, the magnetic body being disposed inside a space between coil surfaces of the feeding coil and receiving coil; and a phase detection circuit that detects a phase difference between a voltage phase and a current phase of the AC power, wherein the magnetic body is disposed so that a coil axis connecting a central axis of the feeding coil and a central axis of the receiving coil passes through the magnetic body, and the transmission control circuit adjusts the drive frequency so as to reduce the phase difference to make the drive frequency track the resonance frequency. - View Dependent Claims (11)
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Specification