Equipment and method for transmitting electric power
First Claim
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1. An electric power transmission device for transmitting electric power between a primary coil and a secondary coil, comprising:
- signal generating means for generating and transmitting an oscillation signal having a fixed frequency;
current supplying means for supplying current to said primary coil;
driving means for drive-controlling a conduction and interruption of said current from said current supplying means to said primary coil at the frequency of said oscillation signal;
said primary coil generating a time-varying magnetic flux at said frequency of said oscillation signal caused by the conduction and interruption of said current by said driving control means;
said secondary coil having a capacitance element connected thereto in parallel for generating an induced electromotive force in accordance with a linkage of said time-varying magnetic flux produced by said primary coil, and for oscillating an induced current generated using said induced electromotive force between said capacitance element and said secondary coil with a frequency higher than said frequency of said oscillation signal as a resonant frequency, wherein said electric power is transmitted from said primary coil to said secondary coil by generating said induced electromotive force in said secondary coil by the linkage of said time-varying magnetic generated in said primary coil.
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Abstract
In an electric power transmission device which transmits electric power between a primary coil and a secondary coil, a resonant frequency of the secondary coil side is arranged to become higher than a frequency of an oscillation signal of the primary coil side, so that a capacitance can be made small and the coupling coefficient of the primary coil and the secondary coil can be made high. Thus, efficiency of power transmission from the primary coil side to the secondary coil side can be improved.
130 Citations
14 Claims
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1. An electric power transmission device for transmitting electric power between a primary coil and a secondary coil, comprising:
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signal generating means for generating and transmitting an oscillation signal having a fixed frequency; current supplying means for supplying current to said primary coil; driving means for drive-controlling a conduction and interruption of said current from said current supplying means to said primary coil at the frequency of said oscillation signal; said primary coil generating a time-varying magnetic flux at said frequency of said oscillation signal caused by the conduction and interruption of said current by said driving control means; said secondary coil having a capacitance element connected thereto in parallel for generating an induced electromotive force in accordance with a linkage of said time-varying magnetic flux produced by said primary coil, and for oscillating an induced current generated using said induced electromotive force between said capacitance element and said secondary coil with a frequency higher than said frequency of said oscillation signal as a resonant frequency, wherein said electric power is transmitted from said primary coil to said secondary coil by generating said induced electromotive force in said secondary coil by the linkage of said time-varying magnetic generated in said primary coil. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. An electric power transmission method for transmitting electric power between a primary coil and a secondary coil which are out of contact with each other, comprising the steps of:
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drive-controlling a current conduction and interruption of current to said primary coil in accordance with an oscillation signal having a predetermined frequency; generating a time-varying magnetic flux at the frequency of said oscillation signal in said primary coil by said conduction and interruption of the current by said driving control means; and transmitting said electric power from said primary coil to said secondary coil by generating an induced electromotive force in said secondary coil by the linkage of said generated magnetic flux in said primary coil, wherein an induced current generated by said induced electromotive force is resonated with a frequency higher than the frequency of said oscillation signal. - View Dependent Claims (10, 11, 12, 13, 14)
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Specification