Wireless power feeder
First Claim
1. A wireless power feeder for feeding power by wireless from a feeding coil to a receiving coil using a magnetic field resonance phenomenon between the feeding coil and receiving coil, the power feeder comprising:
- the feeding coil;
a power transmission control circuit that supplies AC power at a drive frequency to the feeding coil so as to make the feeding coil feed AC power to the receiving coil; and
a phase detection circuit that detects the phase difference between the voltage phase and current phase of the AC power, whereinthe phase detection circuit detects the deviation between a first detection period during which the voltage level of the AC power falls within a predetermined range and a second detection period during which the current level of the AC power falls within a predetermined range to detect the phase difference.
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Accused Products
Abstract
A wireless power feeder 116 feeds power by wireless from a feeding coil L2 to a receiving coil L3 using a magnetic field resonance phenomenon. A power transmission control circuit 200 supplies AC power at a drive frequency fo to the feeding coil L2, thereby making the feeding coil L2 feed the AC power to the receiving coil L3. A phase detection circuit 150 detects the phase difference between the voltage phase and current phase of the AC power. Concretely, the phase detection circuit compares a first detection time period during which a signal T2 assumes a high level and a second detection time period during which a signal S2 assumes a high level and detects the length of the time period in which the first and second detection periods overlap each other to detect the phase difference.
46 Citations
12 Claims
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1. A wireless power feeder for feeding power by wireless from a feeding coil to a receiving coil using a magnetic field resonance phenomenon between the feeding coil and receiving coil, the power feeder comprising:
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the feeding coil; a power transmission control circuit that supplies AC power at a drive frequency to the feeding coil so as to make the feeding coil feed AC power to the receiving coil; and a phase detection circuit that detects the phase difference between the voltage phase and current phase of the AC power, wherein the phase detection circuit detects the deviation between a first detection period during which the voltage level of the AC power falls within a predetermined range and a second detection period during which the current level of the AC power falls within a predetermined range to detect the phase difference. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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Specification
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- Resources
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Current AssigneeTDK Corporation
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Original AssigneeTDK Corporation
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InventorsUrano, Takashi
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Primary Examiner(s)Deberadinis, Robert L.
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Application NumberUS13/178,743Publication NumberTime in Patent Office1,061 DaysField of Search307/104US Class Current307/104CPC Class CodesH02J 50/12 of the resonant type
