Coil unit and noncontact power transmission apparatus
AssigneePanasonic Corporation
InventorsNorihiro MIYASHITA, Atsushi FUJITA, Hideki SADAKATA, Yoshiharu OMORI
Life of this patent
Estimating the term…
Abstract
A coil unit configured to transmit or receive electric power by electromagnetic induction in a noncontact manner, including: a coil into or from both terminals of which a high-frequency voltage is input or output; a metal conductor placed near the coil; and a first capacitor and a second capacitor connected to the terminals of the coil, wherein the ratio of the capacitance between the first capacitor and the second capacitor is set to a value at which a current induced into the metal conductor due to capacitance coupling when a high-frequency voltage is input into or output from the coil is reduced.
Claims12
A coil unit configured to transmit or receive electric power by electromagnetic induction in a noncontact manner, comprising:
- a coil into or from both terminals of which a high-frequency voltage is input or output;
- a metal conductor placed near the coil;
- and
- a first capacitor and a second capacitor connected to the terminals of the coil, wherein
- the ratio of the capacitance between the first capacitor and the second capacitor is set to a value at which a current induced into the metal conductor due to capacitance coupling when a high-frequency voltage is input into or output from the coil is reduced.
A noncontact power transmission apparatus configured to transmit electric power from a power-transmitting coil to a power-receiving coil by electromagnetic induction in a noncontact manner,
- wherein
- at least one of the power-transmitting coil and the power-receiving coil includes
- a coil into or from both terminals of which a high-frequency voltage is input or output,
- a metal conductor placed near the coil, and
- a first capacitor and a second capacitor connected to the terminals of the coil, and
- the ratio of the capacitance between the first capacitor and the second capacitor is set to a value at which a current induced into the metal conductor due to capacitance coupling when a high-frequency voltage is input into or output from the coil is reduced.
A coil unit configured to transmit or receive electric power by electromagnetic induction in a noncontact manner, comprising:
- a coil into or from both terminals of which a high-frequency voltage is input or output;
- a metal conductor placed near the coil;
- and
- a capacitor inserted in the coil,
- wherein
- the coil is separated by the capacitor into a first coil and a second coil different in the magnitude of inductance, and
- the ratio of the inductance between the first coil and the second coil is set to a value at which a current induced into the metal conductor due to capacitance coupling when a high-frequency voltage is input into or output from the coil is reduced.
A coil unit configured to transmit or receive electric power by electromagnetic induction in a noncontact manner, comprising:
- a coil into or from both terminals of which a high-frequency voltage is input or output;
- a metal conductor placed near the coil;
- and
- a ground site at which the coil is grounded,
- wherein
- the coil is separated by the ground site into a first coil and a second coil different in the magnitude of inductance, and
- the ratio of the inductance between the first coil and the second coil is set to a value at which a current induced into the metal conductor due to capacitance coupling when a high-frequency voltage is input into or output from the coil is reduced.
Dependencies are inferred from the claim text.