NON-CONTACT POWER TRANSMISSION APPARATUS AND POWER TRANSMISSION METHOD USING A NON-CONTACT POWER TRANSMISSION APPARATUS
First Claim
1. A non-contact power transmission apparatus comprising an alternating current power source and a resonant system, the resonant system including a primary coil connected to the alternating current power source, a primary-side resonance coil, a secondary-side resonance coil, a secondary coil, and a load connected to the secondary coil, the non-contact power transmission apparatus further comprising:
- a state detecting section that detects a state of the resonant system; and
a variable impedance circuit arranged between the alternating current power source and the primary coil,wherein the variable impedance circuit is configured in such a manner that the impedance of the variable impedance circuit is adjusted based on the state of the resonant system detected by the state detecting section to match an input impedance of the resonant system at a resonant frequency of the resonant system with an impedance of alternating current power source circuitry excluding the primary coil.
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Accused Products
Abstract
Disclosed is a non-contact power transmission apparatus provided with an AC power source and a resonant system. The resonant system has a primary coil that is connected with the AC power source, a primary-side resonance coil, a secondary-side resonance coil, a secondary coil and a load that is connected with the secondary coil. In addition, the non-contact power transmission apparatus is provided with a state detection unit and a variable-impedance circuit. The state detection unit detects the state of the resonant system. The variable-impedance circuit is constructed so as to adjust its own impedance in accordance with the state of the resonant system detected by the state detection unit, in such a way that the input impedance and the output impedance at the resonant frequency of the resonant system are matching.
102 Citations
13 Claims
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1. A non-contact power transmission apparatus comprising an alternating current power source and a resonant system, the resonant system including a primary coil connected to the alternating current power source, a primary-side resonance coil, a secondary-side resonance coil, a secondary coil, and a load connected to the secondary coil, the non-contact power transmission apparatus further comprising:
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a state detecting section that detects a state of the resonant system; and a variable impedance circuit arranged between the alternating current power source and the primary coil, wherein the variable impedance circuit is configured in such a manner that the impedance of the variable impedance circuit is adjusted based on the state of the resonant system detected by the state detecting section to match an input impedance of the resonant system at a resonant frequency of the resonant system with an impedance of alternating current power source circuitry excluding the primary coil. - View Dependent Claims (2, 3, 4, 5)
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6. A non-contact power transmission apparatus having an alternating current power source and a resonant system, the resonant system including a primary coil connected to the alternating current power source, a primary-side resonance coil, a secondary-side resonance coil, a secondary coil, and a load connected to the secondary coil, the non-contact power transmission apparatus further comprising:
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a variable impedance circuit that has a variable reactance element and is arranged between the secondary coil and the load, and a control section that controls the variable impedance circuit, wherein the control section controls reactance of the variable reactance element with respect to change of a parameter representing a state of the resonant system, thereby adjusting impedance of the variable impedance circuit in such a manner as to prevent change of input impedance of the resonant system at the frequency of alternating voltage output from the alternating current power source. - View Dependent Claims (7, 8, 9, 10, 11)
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12. A power transmission method using a non-contact power transmission apparatus having an alternating current power source and a resonant system, the resonant system including a primary coil connected to the alternating current power source, a primary-side resonance coil, a secondary-side resonance coil, a secondary coil, and a load connected to the secondary coil, the power transmission method comprising:
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arranging a variable impedance circuit between the secondary coil and the load; and adjusting the impedance of the variable impedance circuit in such a manner as to prevent change of input impedance of the resonant system at a frequency of alternating voltage output from the alternating current power source with respect to change of a parameter indicating a state of the resonant system. - View Dependent Claims (13)
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Specification