Power transmission device
First Claim
1. A power transmission device, comprising:
- a power transmission coil which transmits electric power to a power receiving coil by an electromagnetic induction method;
a driving unit which supplies a driving voltage to the power transmission coil;
a detection unit which detects an amplitude of an electric current flowing in the power transmission coil based on the driving voltage supplied by the driving unit;
a control unit which changes an amplitude of the driving voltage supplied by the driving unit;
a characteristic determining unit which determines whether the amplitude of the electric current detected by the detection unit is increased at a constant rate when the control unit gradually increases the amplitude of the driving voltage supplied to the power transmission coil from a minimum value; and
a transmission stopping control unit which stops power transmission by the power transmission coil if the characteristic determining unit determines that the amplitude of the electric current is increased at a constant rate.
1 Assignment
0 Petitions
Accused Products
Abstract
A power transmission device includes: a power transmission coil to transmit electric power to a power receiving coil by an electromagnetic induction method; a driving unit to supply a driving voltage to the power transmission coil; a detection unit to detect an electric current flowing in the power transmission coil based on the driving voltage; a control unit to change an amplitude of the driving voltage; a starting point detection unit to detect the amplitude of the driving voltage as a characteristic point at which an electric current starts to flow in the power receiving coil, on a characteristic line representing a relationship between the driving voltage supplied to the power transmission coil and the electric current detected by the detection unit; and a transmission stopping control unit to stop power transmission by the power transmission coil if the characteristic point is not detected by the starting point detection unit.
18 Citations
1 Claim
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1. A power transmission device, comprising:
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a power transmission coil which transmits electric power to a power receiving coil by an electromagnetic induction method; a driving unit which supplies a driving voltage to the power transmission coil; a detection unit which detects an amplitude of an electric current flowing in the power transmission coil based on the driving voltage supplied by the driving unit; a control unit which changes an amplitude of the driving voltage supplied by the driving unit; a characteristic determining unit which determines whether the amplitude of the electric current detected by the detection unit is increased at a constant rate when the control unit gradually increases the amplitude of the driving voltage supplied to the power transmission coil from a minimum value; and a transmission stopping control unit which stops power transmission by the power transmission coil if the characteristic determining unit determines that the amplitude of the electric current is increased at a constant rate.
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Specification