Power transmission device, wireless power feeding system, and control method
First Claim
1. A power transmission device which performs a power transmission process for transmitting power in a wireless manner through electromagnetic field resonance coupling using a resonance circuit,wherein, in a case where a resonance frequency of the resonance circuit set to be the same as a frequency of a power transmission signal which is output as transmission power is deviated during transmission of the power, the power transmission device detects a direction in which the resonance frequency is deviated and controls the power transmission process on the basis of a detection result thereof, andwherein the power transmission device further determines whether the resonance frequency is deviated by a presence of a non-metallic object.
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Accused Products
Abstract
The present power transmission device performs a power transmission process for transmitting power in a wireless manner through electromagnetic field resonance coupling using a resonance circuit. In a case where a resonance frequency of the resonance circuit set to be the same as a frequency of a power transmission signal which is output as transmission power is deviated during transmission of the power, the present power transmission device detects a direction in which the resonance frequency is deviated and controls the power transmission process on the basis of a detection result thereof. Consequently, it is possible to determine not only whether or not a foreign substance is present in a power transmission region but also determines whether or not the foreign substance influences wireless power transmission with high accuracy, and thus reliability of the wireless power transmission system can be improved.
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Citations
20 Claims
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1. A power transmission device which performs a power transmission process for transmitting power in a wireless manner through electromagnetic field resonance coupling using a resonance circuit,
wherein, in a case where a resonance frequency of the resonance circuit set to be the same as a frequency of a power transmission signal which is output as transmission power is deviated during transmission of the power, the power transmission device detects a direction in which the resonance frequency is deviated and controls the power transmission process on the basis of a detection result thereof, and wherein the power transmission device further determines whether the resonance frequency is deviated by a presence of a non-metallic object.
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16. A control method for controlling power transmission in a wireless power feeding system which includes a power transmission device and a power reception device and performs transmission and reception of power through electromagnetic field resonance coupling using power transmission side and power reception side resonance circuits which are respectively provided in the power transmission device and the power reception device, the method comprising:
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performing by the power transmission device; setting a resonance frequency of the power transmission side resonance circuit so that the resonance frequency is the same as a frequency of a power transmission signal which is output as transmission power; starting transmission of the power after setting the resonance frequency; and detecting a direction in which the resonance frequency is deviated in a case where the resonance frequency, after being set, is deviated during transmission of the power and to control a process related to transmission of the power on the basis of a detection result thereof; and determining whether the resonance frequency is deviated by a presence of a non-metallic object. - View Dependent Claims (17, 18, 19, 20)
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Specification