Wireless power transmission system
First Claim
1. A wireless power transmission system comprising:
- a power transmission apparatus;
a power reception apparatus; and
a relay apparatus arranged between the power transmission apparatus and the power reception apparatus,wherein the power transmission apparatus includesa power transmission inverter circuit that converts power transmission direct current power supplied from an external power supply into power transmission alternating current power, anda power transmission power transmission antenna that wirelessly transmits the power transmission alternating current power,wherein the relay apparatus includesa relay power reception antenna that is electromagnetically coupled with the power transmission power transmission antenna and that receives the transmitted power transmission alternating current power,a relay rectifier that converts the received power transmission alternating current power into relay direct current power,a relay inverter circuit that converts the relay direct current power into relay alternating current power, anda relay power transmission antenna that wirelessly transmits the relay alternating current power,wherein the power reception apparatus includesa power reception power reception antenna that is electromagnetically coupled with the relay power transmission antenna and that receives the transmitted relay alternating current power, andwherein the relay apparatus includesa relay amplitude modulator that, when the relay apparatus transmits binary relay transmission data to the power transmission apparatus through the electromagnetic coupling between the relay power reception antenna and the power transmission power transmission antenna, varies amplitude of voltage of the power transmission alternating current power received by the relay power reception antenna between a first amplitude and a second amplitude, anda relay control circuit causes the relay inverter circuit to eliminate a difference between a third amplitude of the relay alternating current power, which corresponds to the first amplitude, and a fourth amplitude of the relay alternating current power, which corresponds to the second amplitude.
1 Assignment
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Accused Products
Abstract
A relay apparatus in a wireless power transmission system includes a relay power reception antenna that receives power transmission alternating current power from a power transmission power transmission antenna, a relay rectifier that converts the power transmission alternating current power into relay direct current power, a relay inverter circuit that converts the relay direct current power into relay alternating current power, and a relay power transmission antenna that wirelessly transmits the relay alternating current power. When transmitting data to the power transmission apparatus through amplitude modulation, the relay apparatus varies amplitude of voltage of the power transmission alternating current power received by the relay power reception antenna between a first amplitude and a second amplitude and performs control for eliminating a difference between a third amplitude of the relay alternating current power and a fourth amplitude of the relay alternating current power.
14 Citations
17 Claims
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1. A wireless power transmission system comprising:
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a power transmission apparatus; a power reception apparatus; and a relay apparatus arranged between the power transmission apparatus and the power reception apparatus, wherein the power transmission apparatus includes a power transmission inverter circuit that converts power transmission direct current power supplied from an external power supply into power transmission alternating current power, and a power transmission power transmission antenna that wirelessly transmits the power transmission alternating current power, wherein the relay apparatus includes a relay power reception antenna that is electromagnetically coupled with the power transmission power transmission antenna and that receives the transmitted power transmission alternating current power, a relay rectifier that converts the received power transmission alternating current power into relay direct current power, a relay inverter circuit that converts the relay direct current power into relay alternating current power, and a relay power transmission antenna that wirelessly transmits the relay alternating current power, wherein the power reception apparatus includes a power reception power reception antenna that is electromagnetically coupled with the relay power transmission antenna and that receives the transmitted relay alternating current power, and wherein the relay apparatus includes a relay amplitude modulator that, when the relay apparatus transmits binary relay transmission data to the power transmission apparatus through the electromagnetic coupling between the relay power reception antenna and the power transmission power transmission antenna, varies amplitude of voltage of the power transmission alternating current power received by the relay power reception antenna between a first amplitude and a second amplitude, and a relay control circuit causes the relay inverter circuit to eliminate a difference between a third amplitude of the relay alternating current power, which corresponds to the first amplitude, and a fourth amplitude of the relay alternating current power, which corresponds to the second amplitude. - View Dependent Claims (2, 3, 4)
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5. A wireless power transmission system comprising:
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a power transmission apparatus; a power reception apparatus; and N (N is an integer equal to or larger than
2) relay apparatuses that are arranged between the power transmission apparatus and the power reception apparatus and that are sorted as first to N-th relay apparatuses in descending order of closeness to the power transmission apparatus,wherein the power transmission apparatus includes a power transmission inverter circuit that converts power transmission direct current power supplied from an external power supply into power transmission alternating current power, and a power transmission power transmission antenna that wirelessly transmits the power transmission alternating current power, wherein the first one of the N relay apparatuses includes a first relay power reception antenna that is electromagnetically coupled with the power transmission power transmission antenna and that receives the transmitted power transmission alternating current power, a first relay rectifier that converts the received power transmission alternating current power into first relay direct current power, a first relay inverter circuit that converts the first relay direct current power into first relay alternating current power, and a first relay power transmission antenna that wirelessly transmits the first relay alternating current power, wherein an i-th (i=2 to N) one of the N relay apparatuses includes an i-th relay power reception antenna that is electromagnetically coupled with an (i−
1)th relay power transmission antenna and that receives (i−
1)th relay alternating current power,an i-th relay rectifier that converts the received (i−
1)th relay alternating current power into i-th relay direct current power,an i-th relay inverter circuit that converts the i-th relay direct current power into i-th relay alternating current power, and an i-th relay power transmission antenna that wirelessly transmits the i-th relay alternating current power, wherein the power reception apparatus includes a power reception power reception antenna that is electromagnetically coupled with an N-th relay power transmission antenna and that receives N-th relay alternating current power, and wherein the i-th (i=2 to N) relay apparatus includes an i-th relay amplitude modulator that, when the i-th relay apparatus transmits binary i-th relay transmission data to the (i−
1)th relay apparatus through the electromagnetic coupling between the i-th relay power reception antenna and the (i−
1)th relay power transmission antenna, varies amplitude of voltage of the (i−
1)th relay alternating current power received by the i-th relay power reception antenna between a first amplitude and a second amplitude, andan i-th relay control circuit causes the relay inverter circuit to eliminate a difference between a third amplitude of the i-th relay alternating current power, which corresponds to the first amplitude, and a fourth amplitude of the i-th relay alternating current power, which corresponds to the second amplitude. - View Dependent Claims (6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17)
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Specification