Metal object detection device
First Claim
1. A metal object detection device applied to a non-contact power feeding device that performs power transfer between a primary coil and a secondary coil in a non-contact manner, the metal object detection device comprising:
- a plurality of detection coils detecting a metal object present in a path of a magnetic flux generated by at least one of the primary coil and the secondary coil;
a capacitor configuring a resonant circuit in cooperation with each of at least two of the plurality of detection coils;
a first series connection body including one of a series connection body having at least one of the resonant circuits and a first passive element, the at least one of the resonant circuits and the first passive element being connected in series, and a series connection body having the detection coil and the capacitor configuring one of the resonant circuits, the detection coil and the capacitor being connected in series;
a second series connection body including one of a series connection body having at least one of the resonant circuits except for the resonant circuit configuring the first series connection body and a second passive element, the at least one of the resonant circuits except for the resonant circuit configuring the first series connection body and the second passive element being connected in series, and a series connection body having the detection coil and the capacitor configuring one of the resonant circuits except for the resonant circuit configuring the first series connection body, the detection coil and the capacitor configuring one of the resonant circuits except for the resonant circuit configuring the first series connection body being connected in series;
a voltage applying unit applying an AC voltage to both ends of each of the first series connection body and the second series connection body; and
a processing unit performing a process for detecting the metal object on the basis of a potential difference between a connection point included in the first series connection body and a connection point included in the second series connection body.
1 Assignment
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Accused Products
Abstract
A metal object detection device includes a plurality of detection coils, a capacitor configuring a resonant circuit in cooperation with each of at least two of the detection coils, a first series connection body, a second series connection body, a voltage applying unit, and a processing unit. The voltage applying unit applies an AC voltage to both ends of each of the first series connection body and the second series connection body. The processing unit performs a process for detecting the metal object on the basis of a potential difference between a connection point included in the first series connection body and a connection point included in the second series connection body.
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Citations
28 Claims
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1. A metal object detection device applied to a non-contact power feeding device that performs power transfer between a primary coil and a secondary coil in a non-contact manner, the metal object detection device comprising:
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a plurality of detection coils detecting a metal object present in a path of a magnetic flux generated by at least one of the primary coil and the secondary coil; a capacitor configuring a resonant circuit in cooperation with each of at least two of the plurality of detection coils; a first series connection body including one of a series connection body having at least one of the resonant circuits and a first passive element, the at least one of the resonant circuits and the first passive element being connected in series, and a series connection body having the detection coil and the capacitor configuring one of the resonant circuits, the detection coil and the capacitor being connected in series; a second series connection body including one of a series connection body having at least one of the resonant circuits except for the resonant circuit configuring the first series connection body and a second passive element, the at least one of the resonant circuits except for the resonant circuit configuring the first series connection body and the second passive element being connected in series, and a series connection body having the detection coil and the capacitor configuring one of the resonant circuits except for the resonant circuit configuring the first series connection body, the detection coil and the capacitor configuring one of the resonant circuits except for the resonant circuit configuring the first series connection body being connected in series; a voltage applying unit applying an AC voltage to both ends of each of the first series connection body and the second series connection body; and a processing unit performing a process for detecting the metal object on the basis of a potential difference between a connection point included in the first series connection body and a connection point included in the second series connection body. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 28)
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17. A metal object detection device applied to a non-contact power feeding device that performs power transfer between a primary coil and a secondary coil in a non-contact manner, the metal object detection device comprising:
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a detection coil detecting a metal object present in a path of a magnetic flux generated by at least one of the primary coil and the secondary coil when the power transfer is performed in the non-contact manner; a supply unit supplying an AC power to the detection coil; and a processing unit performing a process for detecting the metal object on the basis of a change in impedance of the detection coil when the AC power is supplied to the supply unit, wherein; the detection coil concurrently includes a portion in which an induced current flows in a predetermined direction, and a portion in which the induced current flows in a direction opposite to the predetermined direction when a main magnetic flux circulating between the primary coil and the secondary coil passes through the detection coil; and the detection coil includes a series connection body having a first winding part wound around one of a pair of axes that is in parallel to and spaced from each other in a specified direction, and a second winding part wound around the other of the pair of axes in a direction opposite to the specified direction, as the portion in which the induced current flows in the predetermined direction, and the portion in which the induced current flows in the direction opposite to the predetermined direction. - View Dependent Claims (18, 19, 20, 21, 22, 23, 24, 25, 26, 27)
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Specification