Power transmission device
First Claim
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1. A power transmission device comprising:
- a first power transmitter; and
a second power transmitter, whereinthe first power transmitter includesa first primary side resonance coil configured to receive power from an AC power source,a first phase difference detection unit configured to detect a first phase difference between a phase of a first current flowing to the first primary side resonance coil and a phase of a first voltage supplied to the first primary side resonance coil,a first variable capacitance unit provided at the first primary side resonance coil, anda first control unit configured to adjust a first capacitance of the first variable capacitance unit such that a resonance frequency is attained, based on a variation degree of the first phase difference with respect to a variation of the first capacitance when the first capacitance is varied, and whereinthe second power transmitter includesa phase adjustment unit connected to the AC power source,a second primary side resonance coil configured to receive power from the AC power source via the phase adjustment unit, the second primary side resonance coil being arranged beside the first primary side resonance coil,a second phase difference detection unit configured to detect a second phase difference between a phase of a second current flowing to the second primary side resonance coil and a phase of a second voltage supplied to the second primary side resonance coil,a second variable capacitance unit provided at the second primary side resonance coil, anda second control unit configured to adjust a second capacitance of the second variable capacitance unit such that a resonance frequency is attained, based on a variation degree of the second phase difference to a variation of the second capacitance when the second capacitance is varied, and whereinthe first control unit adjusts the resonance frequency of the first power transmitter in a state where the second power transmitter is off, andthe second control unit adjusts the resonance frequency of the second power transmitter in a state where the first power transmitter is off.
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Abstract
A power transmission device that adjusts the resonance frequency of a plurality of power transmitters with high precision, is provided.
The power transmission device includes a first power transmitter and a second power transmitter that respectively adjust the capacitance such that a resonance frequency is attained, based on a variation degree of a phase difference with respect to a variation of the capacitance when the capacitance of a variable capacitance unit is varied, and the first control unit adjusts the resonance frequency of the first power transmitter in a state where the second power transmitter is off, and the second control unit adjusts the resonance frequency of the second power transmitter in a state where the first power transmitter is off.
9 Citations
7 Claims
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1. A power transmission device comprising:
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a first power transmitter; and a second power transmitter, wherein the first power transmitter includes a first primary side resonance coil configured to receive power from an AC power source, a first phase difference detection unit configured to detect a first phase difference between a phase of a first current flowing to the first primary side resonance coil and a phase of a first voltage supplied to the first primary side resonance coil, a first variable capacitance unit provided at the first primary side resonance coil, and a first control unit configured to adjust a first capacitance of the first variable capacitance unit such that a resonance frequency is attained, based on a variation degree of the first phase difference with respect to a variation of the first capacitance when the first capacitance is varied, and wherein the second power transmitter includes a phase adjustment unit connected to the AC power source, a second primary side resonance coil configured to receive power from the AC power source via the phase adjustment unit, the second primary side resonance coil being arranged beside the first primary side resonance coil, a second phase difference detection unit configured to detect a second phase difference between a phase of a second current flowing to the second primary side resonance coil and a phase of a second voltage supplied to the second primary side resonance coil, a second variable capacitance unit provided at the second primary side resonance coil, and a second control unit configured to adjust a second capacitance of the second variable capacitance unit such that a resonance frequency is attained, based on a variation degree of the second phase difference to a variation of the second capacitance when the second capacitance is varied, and wherein the first control unit adjusts the resonance frequency of the first power transmitter in a state where the second power transmitter is off, and the second control unit adjusts the resonance frequency of the second power transmitter in a state where the first power transmitter is off. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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Specification
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Current AssigneeFujitsu Limited
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Original AssigneeFujitsu Limited
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InventorsUchida, Akiyoshi, Shimokawa, Satoshi
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Primary Examiner(s)Barnie, Rexford
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Assistant Examiner(s)WILLOUGHBY, TERRENCE RONIQUE
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Application NumberUS15/083,465Publication NumberTime in Patent Office224 DaysField of SearchUS Class Current1/1CPC Class CodesH01F 38/14 Inductive couplings for wir...H02J 50/12 of the resonant typeH02J 50/90 involving detection or opti...
