Contactless power supplying system and metal foreign object detection device of contactless power supplying system
First Claim
1. A contactless power supplying system comprising:
- a power supplying device including a primary coil and a high-frequency inverter that applies high-frequency current to the primary coil;
an appliance including a secondary coil that generates an induced electromotive force using an alternate magnetic field generated by the current flowing to the primary coil, wherein the appliance uses the electromotive force generated at the secondary coil to supply power to a load; and
a metal foreign object detection device includingan antenna coil,an oscillation circuit that applies high-frequency current to the antenna coil, anda detection circuit that detects a change in voltage or current observed at one of the oscillation circuit and the antenna coil, whereinthe oscillation circuit includes a component having a design value that generates oscillation in a range of oscillation conditions from immediately after the oscillation circuit starts to generate oscillation to just before a stable and continuous oscillation condition, andthe metal foreign object detection device detects, with the detection circuit, a suspension of the oscillation of the oscillation circuit or an attenuation in amplitude of the oscillation based on a change in an electric characteristic of the antenna coil caused by a metal foreign object arranged on the power supplying device, and controls the power supplying device.
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0 Petitions
Accused Products
Abstract
A contactless power supplying system, which excites a primary coil of a power supplying device to generate an induced electromotive force at a secondary coil of an appliance arranged on the device and supply the induced electromotive force to a load of the appliance, includes a metal foreign object detection device. The metal foreign object detection device includes an antenna coil, an oscillation circuit, and a detection circuit. The oscillation circuit includes a component having a design value that generates oscillation in a range of oscillation conditions from immediately after the oscillation circuit starts to generate oscillation to just before a stable and continuous oscillation condition. The detection circuit detects a suspension of the oscillation or an attenuation in amplitude of the oscillation based on a change in an electric characteristic of the antenna coil caused by a metal foreign object on the power supplying device.
19 Citations
20 Claims
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1. A contactless power supplying system comprising:
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a power supplying device including a primary coil and a high-frequency inverter that applies high-frequency current to the primary coil; an appliance including a secondary coil that generates an induced electromotive force using an alternate magnetic field generated by the current flowing to the primary coil, wherein the appliance uses the electromotive force generated at the secondary coil to supply power to a load; and a metal foreign object detection device including an antenna coil, an oscillation circuit that applies high-frequency current to the antenna coil, and a detection circuit that detects a change in voltage or current observed at one of the oscillation circuit and the antenna coil, wherein the oscillation circuit includes a component having a design value that generates oscillation in a range of oscillation conditions from immediately after the oscillation circuit starts to generate oscillation to just before a stable and continuous oscillation condition, and the metal foreign object detection device detects, with the detection circuit, a suspension of the oscillation of the oscillation circuit or an attenuation in amplitude of the oscillation based on a change in an electric characteristic of the antenna coil caused by a metal foreign object arranged on the power supplying device, and controls the power supplying device. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A metal foreign object detection device for a contactless power supplying system that excites a primary coil of a power supplying device to generate an induced electromotive force with electromagnetic induction at a secondary coil of an appliance arranged on the power supplying device and supply the induced electromotive force to a load of the appliance, the metal foreign object detection device comprising:
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an antenna coil; an oscillation circuit that applies high-frequency current to the antenna coil; and a detection circuit that detects a change in voltage or current observed at one of the oscillation circuit and the antenna coil, wherein the oscillation circuit includes a component having a design value that generates oscillation in a range of oscillation conditions from immediately after the oscillation circuit starts to generate oscillation to just before a stable and continuous oscillation condition, and the detection circuit detects suspension of the oscillation of the oscillation circuit or an attenuation in amplitude of the oscillation based on a change in an electric characteristic of the antenna coil caused by a metal foreign object arranged on the power supplying device, and controls the power supplying device. - View Dependent Claims (12, 13, 14, 15, 16, 17, 18, 19, 20)
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Specification