CONTACTLESS POWER TRANSMISSION SYSTEM
First Claim
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1. A contactless power transmission system, comprising a power transmitting device including power transmission coils for transmitting power, and a power receiving device including a power receiving coil to be magnetically coupled to the power transmission coils,whereinthe power transmitting device includes:
- a placing portion, on which the power receiving device is to be placed,a plurality of power transmission coils arranged below the placing portion,an oscillator for oscillating the respective power transmission coils while separately exciting them,a detector for detecting the inductances of the respective power transmission coils, anda determiner for determining the placed position of the power receiving device on the placing portion based on the inductances of the respective power transmission coils detected by the detector; and
the oscillator specifies a plurality of power transmission coils to be oscillated based on the placed position determined by the determiner and sets parameters of currents to flow into the respective power transmission coils so as to mutually shift the waveforms of currents to flow into the plurality of specified power transmission coils.
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Abstract
Power saving is promoted by oscillating only power transmission coil contributing to contactless charging without using any communication means.
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Citations
20 Claims
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1. A contactless power transmission system, comprising a power transmitting device including power transmission coils for transmitting power, and a power receiving device including a power receiving coil to be magnetically coupled to the power transmission coils,
wherein the power transmitting device includes: -
a placing portion, on which the power receiving device is to be placed, a plurality of power transmission coils arranged below the placing portion, an oscillator for oscillating the respective power transmission coils while separately exciting them, a detector for detecting the inductances of the respective power transmission coils, and a determiner for determining the placed position of the power receiving device on the placing portion based on the inductances of the respective power transmission coils detected by the detector; and the oscillator specifies a plurality of power transmission coils to be oscillated based on the placed position determined by the determiner and sets parameters of currents to flow into the respective power transmission coils so as to mutually shift the waveforms of currents to flow into the plurality of specified power transmission coils. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20)
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Specification