Power feeding device and wireless power feeding system
First Claim
1. A wireless power feeding device comprising:
- a high frequency power source configured to output an alternating-current signal;
a first resonant coil configured to resonate with a second resonant coil of a wireless power reception device;
a coil electromagnetically coupled to the first resonant coil;
a transmission-reception circuit configured to generate a first wireless signal and demodulate a second wireless signal from the wireless power reception device;
a matching circuit configured to match impedance between the high frequency power source and the coil in accordance with a power value of the second wireless signal, the power value being detected by the wireless power reception device; and
a control circuit configured to generate a data signal of the first wireless signal in accordance with the power value of the second wireless signal, the data signal including parameters of the matching circuit.
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Accused Products
Abstract
A resonant power feeding system that can provide high power transmission efficiency between a power feeding device and a power reception device without dynamically controlling the oscillation frequency in accordance with the distance between the power feeding device and the power reception device. High power transmission efficiency between the power feeding device and the power reception device is obtained by addition of a structure for adjusting the matching condition to both the power reception device and the power feeding device. Specifically, a transmission-reception circuit and a matching circuit are provided in both the power reception device and the power feeding device, and wireless signals for adjusting the matching circuit are transmitted and received through a resonant coil. Thus, the power feeding device can efficiently supply power to the power reception device without adjusting the oscillation frequency.
75 Citations
18 Claims
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1. A wireless power feeding device comprising:
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a high frequency power source configured to output an alternating-current signal; a first resonant coil configured to resonate with a second resonant coil of a wireless power reception device; a coil electromagnetically coupled to the first resonant coil; a transmission-reception circuit configured to generate a first wireless signal and demodulate a second wireless signal from the wireless power reception device; a matching circuit configured to match impedance between the high frequency power source and the coil in accordance with a power value of the second wireless signal, the power value being detected by the wireless power reception device; and a control circuit configured to generate a data signal of the first wireless signal in accordance with the power value of the second wireless signal, the data signal including parameters of the matching circuit. - View Dependent Claims (2, 3, 4, 5)
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6. A wireless power reception device for receiving power signals from a wireless power feeding device having a first resonant coil, the device comprising:
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a rectifier circuit; a second resonant coil configured to resonate with the first resonant coil of the wireless power feeding device; a coil electromagnetically coupled to the second resonant coil; a transmission-reception circuit configured to demodulate a first wireless signal from the wireless power feeding device and generate a second wireless signal; a matching circuit configured to match impedance between the rectifier circuit and the coil in accordance with a data signal of the first wireless signal, the data signal including parameters of the matching circuit; and a control circuit configured to generate a data of the second wireless signal including a power value received from the wireless power feeding device. - View Dependent Claims (7, 8, 9, 10)
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11. A wireless power feeding system comprising:
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a wireless power feeding device comprising; a high frequency power source configured to output an alternating-current signal; a first resonant coil configured to resonate with a second resonant coil; a first coil electromagnetically coupled to the first resonant coil; a first transmission-reception circuit configured to generate a first wireless signal and demodulate a second wireless signal; a first matching circuit configured to match impedance between the high frequency power source and the first coil in accordance with a power value of the second wireless signal, the power value being detected by a wireless power reception device; and a first control circuit configured to generate a data signal of the first wireless signal in accordance with the power value of the second wireless signal, the data signal including parameters of the first matching circuit, and the wireless power reception device comprising; the second resonant coil configured to resonate with the first resonant coil; a second coil electromagnetically coupled to the second resonant coil; a rectifier circuit; a second transmission-reception circuit configured to generate the second wireless signal and demodulate the first wireless signal; a second matching circuit configured to match impedance between the rectifier circuit and the second coil in accordance with the data signal of the first wireless signal; and a second control circuit configured to generate the second wireless signal including the power value. - View Dependent Claims (12, 13, 14, 15, 16, 17, 18)
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Specification