Wireless power transmission system
First Claim
1. A wireless power transmission system comprising:
- a power transmitting device includingan inverter circuit that converts a first DC power supplied from a power source into AC power and outputs the AC power,a power transmitting antenna that wirelessly transmits the output AC power, anda power transmission control circuit that adjusts voltage and frequency of the AC power output from the inverter circuit;
a power receiving device includinga power receiving antenna that receives the AC power transmitted from the power transmitting antenna, anda rectifying circuit that converts the received AC power into a second DC power; and
a load into which the second DC power is input,wherein the power transmitting device and the power receiving device are capable of being coupled and detached,wherein the power receiving device further includes a receiving-side transmitter that transmits, to the power transmitting device, control information of the power receiving device including (i) a coupling coefficient between the power transmitting antenna and the power receiving antenna, (ii) requested voltage of the load of the power receiving device, and (iii) load impedance of the load,wherein the power transmitting device further includesa transmitting-side receiver that receives the control information of the power receiving device from the receiving-side transmitter, anda table containing control parameters correlated with (i) the coupling coefficient, (ii) the requested voltage, and (iii) the load impedance,and wherein the power transmission control circuit initially;
causes the inverter circuit to output preliminary AC power to activate the receiving-side transmitter of the power receiving device in a state where the power transmitting device and power receiving device are coupled, the preliminary AC power being lower than a power to activate the load of the power receiving device,causes the transmitting-side receiver to receive the control information of the power receiving device from the power receiving device during the inverter circuit outputting the preliminary AC power,determines the control parameter based on the control information by referring to the table, andadjusts the voltage of the AC power output from the inverter circuit using the control parameter,after the power transmission control circuit has adjusted the voltage of the AC power output from the inverter circuit using the control parameter, the power receiving device creates and transmits, to the power transmitting device via the receiving-side transmitter, control error signals representing a difference between a requested voltage value of the load and a current voltage value of the load, andthe power transmission control circuit adjusts the voltage of the AC power output from the inverter circuit using the control error signals in order to output the power to activate the load.
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Accused Products
Abstract
A wireless power transmission system includes a power transmitting device, power receiving device, and load. The power transmitting device includes an inverter circuit, power transmitting antenna, power transmission control circuit, and transmitting-side receiver. The power receiving device includes a power receiving antenna, rectifying circuit, and receiving-side transmitter. The power transmission control circuit causes the inverter circuit to output preliminary AC power to activate the power receiving device. The receiving-side transmitter transmits, to the power transmitting device, control information of the power receiving device including (i) a coupling coefficient between the power transmitting antenna and the power receiving antenna, (ii) requested voltage of the power receiving device, and (iii) load impedance of the load. The power transmission control circuit determines the control parameter based on the control information by referring to the table, based on the control information, and adjusts the voltage and frequency of the AC power output from the inverter circuit using the control parameter.
14 Citations
12 Claims
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1. A wireless power transmission system comprising:
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a power transmitting device including an inverter circuit that converts a first DC power supplied from a power source into AC power and outputs the AC power, a power transmitting antenna that wirelessly transmits the output AC power, and a power transmission control circuit that adjusts voltage and frequency of the AC power output from the inverter circuit; a power receiving device including a power receiving antenna that receives the AC power transmitted from the power transmitting antenna, and a rectifying circuit that converts the received AC power into a second DC power; and a load into which the second DC power is input, wherein the power transmitting device and the power receiving device are capable of being coupled and detached, wherein the power receiving device further includes a receiving-side transmitter that transmits, to the power transmitting device, control information of the power receiving device including (i) a coupling coefficient between the power transmitting antenna and the power receiving antenna, (ii) requested voltage of the load of the power receiving device, and (iii) load impedance of the load, wherein the power transmitting device further includes a transmitting-side receiver that receives the control information of the power receiving device from the receiving-side transmitter, and a table containing control parameters correlated with (i) the coupling coefficient, (ii) the requested voltage, and (iii) the load impedance, and wherein the power transmission control circuit initially; causes the inverter circuit to output preliminary AC power to activate the receiving-side transmitter of the power receiving device in a state where the power transmitting device and power receiving device are coupled, the preliminary AC power being lower than a power to activate the load of the power receiving device, causes the transmitting-side receiver to receive the control information of the power receiving device from the power receiving device during the inverter circuit outputting the preliminary AC power, determines the control parameter based on the control information by referring to the table, and adjusts the voltage of the AC power output from the inverter circuit using the control parameter, after the power transmission control circuit has adjusted the voltage of the AC power output from the inverter circuit using the control parameter, the power receiving device creates and transmits, to the power transmitting device via the receiving-side transmitter, control error signals representing a difference between a requested voltage value of the load and a current voltage value of the load, and the power transmission control circuit adjusts the voltage of the AC power output from the inverter circuit using the control error signals in order to output the power to activate the load. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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Specification