Detection apparatus, electric power receiving apparatus, electric power transmission apparatus, wireless electric power transmission system, and detection method
First Claim
Patent Images
1. An energy receiver to receive energy in a wireless manner from an energy transmitter, said energy receiver comprising:
- a resonance circuit including at least an inductor, a first capacitor, and a second capacitor;
a Q-value circuit configured to be selectively connected to the resonance circuit, the Q-value circuit being configured to obtain a first voltage taken at a first node of the resonance circuit and a second voltage taken at a second node of the resonance circuit, wherein, the first and second capacitors are connected in series between the first and second nodes; and
a switching circuit having a plurality switches to selectively connect the resonance circuit to the Q-value circuit,wherein the Q-value circuit includes;
a computing circuit configured to compute a Q-value based on the first voltage and the second voltage, the Q-value being a ratio of the first voltage relative to the second voltage, anda control circuit configured to compare the Q-value with a threshold value to determine when foreign matter is in a space affecting the wireless reception of energy, and configured to control the switching circuit such that electric power is received by the energy receiver at a different time than when the first and second voltages are obtained, andwherein the Q-value circuit is configured to detect an electromagnetically coupled state of at least the inductor.
1 Assignment
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.
9 Citations
16 Claims
-
1. An energy receiver to receive energy in a wireless manner from an energy transmitter, said energy receiver comprising:
-
a resonance circuit including at least an inductor, a first capacitor, and a second capacitor; a Q-value circuit configured to be selectively connected to the resonance circuit, the Q-value circuit being configured to obtain a first voltage taken at a first node of the resonance circuit and a second voltage taken at a second node of the resonance circuit, wherein, the first and second capacitors are connected in series between the first and second nodes; and a switching circuit having a plurality switches to selectively connect the resonance circuit to the Q-value circuit, wherein the Q-value circuit includes; a computing circuit configured to compute a Q-value based on the first voltage and the second voltage, the Q-value being a ratio of the first voltage relative to the second voltage, and a control circuit configured to compare the Q-value with a threshold value to determine when foreign matter is in a space affecting the wireless reception of energy, and configured to control the switching circuit such that electric power is received by the energy receiver at a different time than when the first and second voltages are obtained, and wherein the Q-value circuit is configured to detect an electromagnetically coupled state of at least the inductor. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14)
-
-
15. A method to detect foreign matter in a space affecting wireless transmission of electric power from a transmitter to a receiver, said method comprising:
-
receiving electric energy from a resonance circuit that includes at least an inductor, a first capacitor, and a second capacitor; obtaining, by a Q-value circuit configured to be selectively connected to the resonance circuit, a first voltage taken at a first node of the resonance circuit and a second voltage taken at a second node of the resonance circuit; selectively connecting, by a switching circuit having a plurality of switches, the resonance circuit to the Q-value circuit; controlling the switching circuit such that electric power is received by the receiver at a different time than when the first and second voltages are obtained; and detecting an electromagnetically coupled state of at least the inductor, wherein the first and second capacitors are connected in series between the first and second nodes, a Q-value is computed based on the first voltage and the second voltage, the Q-value being a ratio of the first voltage relative to the second voltage; and the Q-value is compared with a threshold value to determine when foreign matter is in a space affecting the wireless reception of energy.
-
-
16. An energy transmitter to transmit energy in a wireless manner to an energy receiver, said energy transmitter comprising:
-
a resonance circuit including at least an inductor, a first capacitor, and a second capacitor; a Q-value circuit configured to be selectively connected to the resonance circuit, the Q-value circuit being configured to determine a relationship of a first voltage taken at a first node relative to a second voltage taken at a second node; and a switching circuit having a plurality switches to selectively connect the resonance circuit to the Q-value circuit, wherein, the first and second capacitors are connected in series between the first and second nodes, wherein the Q-value circuit includes; a computing circuit configured to compute a Q-value based on the first voltage and the second voltage, the Q-value being a ratio of the first voltage relative to the second voltage; and a control circuit configured to compare the Q-value with a threshold value to determine when foreign matter is in a space affecting the wireless reception of energy, and configured to control the switching circuit such that electric power is received by the energy receiver at a different time than when the first and second voltages are obtained, and wherein the Q-value circuit is configured to detect an electromagnetically coupled state of at least the inductor.
-
Specification