INDUCED POWER TRANSMISSION CIRCUIT
First Claim
1. An inductive electric power transfer circuit, comprising:
- a transmitter antenna connected with a series power supply circuit that supply electric power at angular frequency ω
;
a receiver antenna connected with a series load circuit that consume the electric power;
capacitance C1 which is connected between both ends of the transmitter antenna; and
capacitance C2 which is connected between both ends of the receiver antenna;
wherein distance between the transmitter antenna and the receiver antenna is not greater than ½
/2π
wavelengths of electromagnetic field at the angular frequency ω
, the transmitter antenna has effective self-inductance L1, and the receiver antenna has effective self-inductance L2, the magnetic inductive coupling factor between the transmitter antenna and the receiver antenna is represented by the symbol k, and wherein with a phase angle β
that is not less than zero and not greater than pi, the angular frequency ω
is reciprocal of square root of L2×
C2×
(1+k×
cos (β
)), the power supply circuit has output impedance of k ω
L1×
sin (β
)≡
r1, and the load circuit has input impedance of kω
L2×
sin (β
)≡
r2, thereby efficiently transferring power from the power supply circuit to the load circuit through space.
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Accused Products
Abstract
To provide an induced power transmission circuit that transmits, from a transmission antenna (1) connected to a power supply circuit, an AC power having an angular frequency ω to a spaced reception antenna (2) with an excellent efficiency, thereby transmitting it to a load circuit. The induced power transmission circuit comprises a circuit the two ends of which are coupled by a capacitor (C1) and in which the power supply circuit is connected in series to a midway port (1) (P1) of the transmission antenna (1) having an effective self-inductance L1; and a circuit the two ends of which are coupled by a capacitor (C2) and in which the load circuit is connected in series to a midway port (2) (P2) of the reception antenna (2) having an effective self-inductance L2; wherein for a coupling coefficient k of the electromagnetic induction between the antennas and for a phase angle β having an arbitrary value, the angular frequency ω is set to the square root of the reciprocal of a value of L2×C2×(1+k*cos (β)), the output impedance of the power supply circuit is set to approximately kωL1*sin (β), and the input impedance of the load circuit is set to approximately kωL2*sin (β). There is also provided an impedance converting circuit that converts the circuit impedances.
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Citations
12 Claims
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1. An inductive electric power transfer circuit, comprising:
-
a transmitter antenna connected with a series power supply circuit that supply electric power at angular frequency ω
;a receiver antenna connected with a series load circuit that consume the electric power; capacitance C1 which is connected between both ends of the transmitter antenna; and capacitance C2 which is connected between both ends of the receiver antenna; wherein distance between the transmitter antenna and the receiver antenna is not greater than ½
/2π
wavelengths of electromagnetic field at the angular frequency ω
, the transmitter antenna has effective self-inductance L1, and the receiver antenna has effective self-inductance L2, the magnetic inductive coupling factor between the transmitter antenna and the receiver antenna is represented by the symbol k, and wherein with a phase angle β
that is not less than zero and not greater than pi, the angular frequency ω
is reciprocal of square root of L2×
C2×
(1+k×
cos (β
)), the power supply circuit has output impedance of k ω
L1×
sin (β
)≡
r1, and the load circuit has input impedance of kω
L2×
sin (β
)≡
r2, thereby efficiently transferring power from the power supply circuit to the load circuit through space. - View Dependent Claims (2, 3, 4, 5, 6, 7)
-
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8. An inductive electric power transfer circuit, comprising:
-
a transmitter antenna connected with a series power supply circuit that supply electric power at angular frequency ω
;a receiver antenna connected with a series load circuit that consume the electric power; capacitance C1 which is connected between both ends of the transmitter antenna; and capacitance C2 which is connected between both ends of the receiver antenna; wherein distance between the transmitter antenna and the receiver antenna is not greater than ½
π
wavelengths of electromagnetic field at the angular frequency ω
, the transmitter antenna has effective self-inductance L1, the receiver antenna has effective self-inductance L2, the mutual inductance between the transmitter antenna and the receiver antenna is represented by the symbol M, and output impedance of the power supply circuit is represented by the symbol Z1, and wherein the angular frequency ω
is reciprocal of square root of L2×
C2, and the load circuit has input impedance of (ω
M)2/Z1, thereby efficiently transferring power from the power supply circuit to the load circuit through space. - View Dependent Claims (9, 10, 11, 12)
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Specification