ELECTRIC FIELD COUPLING TYPE WIRELESS ELECTRIC POWER TRANSMITTING SYSTEM AND ELECTRIC POWER RECEIVING APPARATUS INCLUDED THE SAME
First Claim
1. A power receiving apparatus that receives electric power transmitted from a power transmitting apparatus that includes a power supply circuit that generates an AC voltage of a predetermined transmitting frequency, at least one pair of power transmitting electrodes, and a resonant circuit coupled between the power supply circuit and the at least one pair of power transmitting electrodes and that applies the AC voltage across the at least one pair of power transmitting electrodes, the power receiving apparatus comprising:
- a load circuit;
at least one pair of power receiving electrodes that generate a coupling capacitive coupling with the at least one pair of power transmitting electrodes when the power receiving apparatus is positioned adjacent the power transmitting apparatus;
a resonant circuit coupled between the load circuit and the at least one pair of power receiving electrodes that applies the AC voltage to the load circuit; and
an overvoltage suppressing circuit comprising an impedance element and coupled in parallel to the resonant circuit of the power receiving apparatus, the impedance element having an impedance value that suppresses an increase in a voltage across the at least one pair of power receiving electrodes when a value of the coupling capacitance decreases.
1 Assignment
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Accused Products
Abstract
An electric power receiving apparatus of an electric power transmitting system includes an overvoltage suppressing unit connected in parallel to a resonant circuit. The overvoltage suppressing unit is formed by an impedance element. Impedance of the impedance element is set to such a value that a rise in a voltage across at least one pair of electric power receiving electrodes is suppressed as compared to a case in which the impedance element is not connected, in the process in which coupling capacitance Cm between electric power transmitting electrodes and the electric power receiving electrodes changes from a value held while the electric power transmitting electrodes and the electric power receiving electrodes are in a predetermined positional relationship during normal electric power transmission to substantially zero.
11 Citations
20 Claims
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1. A power receiving apparatus that receives electric power transmitted from a power transmitting apparatus that includes a power supply circuit that generates an AC voltage of a predetermined transmitting frequency, at least one pair of power transmitting electrodes, and a resonant circuit coupled between the power supply circuit and the at least one pair of power transmitting electrodes and that applies the AC voltage across the at least one pair of power transmitting electrodes, the power receiving apparatus comprising:
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a load circuit; at least one pair of power receiving electrodes that generate a coupling capacitive coupling with the at least one pair of power transmitting electrodes when the power receiving apparatus is positioned adjacent the power transmitting apparatus; a resonant circuit coupled between the load circuit and the at least one pair of power receiving electrodes that applies the AC voltage to the load circuit; and an overvoltage suppressing circuit comprising an impedance element and coupled in parallel to the resonant circuit of the power receiving apparatus, the impedance element having an impedance value that suppresses an increase in a voltage across the at least one pair of power receiving electrodes when a value of the coupling capacitance decreases. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15)
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16. An power transmitting system, comprising:
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an power transmitting apparatus including; a power supply circuit that generates an AC voltage of a predetermined frequency, at least one pair of power transmitting electrodes, and a resonant circuit coupled between the power supply circuit and the at least one pair of electric power transmitting electrodes and that applies the AC voltage across the at least one pair of power transmitting electrodes; and a power receiving apparatus comprising; a load circuit; at least one pair of power receiving electrodes that generate a coupling capacitive coupling with the at least one pair of power transmitting electrodes; a resonant circuit coupled between the load circuit and the at least one pair of power receiving electrodes that applies the AC voltage to the load circuit; and an overvoltage suppressing circuit comprising an impedance element and coupled in parallel to the resonant circuit of the power receiving apparatus, the impedance element having an impedance value that suppresses an increase in a voltage across the at least one pair of power receiving electrodes when a value of the coupling capacitance decreases. - View Dependent Claims (17, 18, 19, 20)
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Specification