Detection apparatus, electric power receiving apparatus, electric power transmission apparatus, wireless electric power transmission system, and detection method
First Claim
Patent Images
1. A power transmission device comprising:
- a resonance circuit including a coil and a capacitor;
communication circuitry configured to perform communication with a power reception device;
detection circuitry configured to measure a first Q-value of the resonance circuit;
control circuitry configured to supply an alternating current to the resonance circuit for the measurement of the Q-value and to control the detection circuitry to measure the first Q-value, in a state where the resonance circuit is not transmitting power; and
determination circuitry configured to receive an information received from the power reception device in response to a request from the communication circuitry, whereinthe determination circuitry is configured to compare the first Q-value with a threshold value to determine whether a foreign object is in a space affecting the power transmission, andthe threshold value is a second Q-value that is based on the information received from the power reception device.
0 Assignments
0 Petitions
Accused Products
Abstract
A method for wireless power transmission includes obtaining, via a Q-value circuit, first and second voltages at respective first and second nodes of a resonance circuit. The first and second voltages are effective to determine if foreign matter is present in a space affecting wireless power transmission. The method includes controlling a switching section between the Q-value circuit and the resonance circuit such that at least a part of the electric power transmission process occurs at a different time than when the first and second voltages are obtained.
6 Citations
17 Claims
-
1. A power transmission device comprising:
-
a resonance circuit including a coil and a capacitor; communication circuitry configured to perform communication with a power reception device; detection circuitry configured to measure a first Q-value of the resonance circuit; control circuitry configured to supply an alternating current to the resonance circuit for the measurement of the Q-value and to control the detection circuitry to measure the first Q-value, in a state where the resonance circuit is not transmitting power; and determination circuitry configured to receive an information received from the power reception device in response to a request from the communication circuitry, wherein the determination circuitry is configured to compare the first Q-value with a threshold value to determine whether a foreign object is in a space affecting the power transmission, and the threshold value is a second Q-value that is based on the information received from the power reception device. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
-
-
12. A power transfer system comprising:
-
a power transmission device; and a power reception device, wherein the power transmission device includes; a resonance circuit including a coil and a capacitor, communication circuitry configured to perform communication with the power reception device, detection circuitry configured to measure a Q-value of the resonance circuit, control circuitry configured to supply an alternating current to the resonance circuit for the measurement of the Q-value and to control the detection circuitry to measure the Q-value, in a state where the resonance circuit is not transferring power, and determination circuitry configured to receive an information received from the power reception device in response to a request from the communication circuitry, wherein the determination circuitry is configured to compare the first Q-value with a threshold value to determine whether a foreign object is in a space affecting the power transmission, and the threshold value is a second Q-value that is based on the information received from the power reception device. - View Dependent Claims (13, 14, 15, 16, 17)
-
Specification