Nissan Motor Company Limited

Throngnumchai Kraisorn

Toshihiro Kai

Yuusuke Minagawa

Yuuya Yamauchi

Yusuke Minagawa

Akinori Okubo

Kentaro Shin

Yuya Yamauchi

A switching device according to the present invention comprises: a main circuit including a switching element; a control circuit which generates a control signal for switching the switching element between an on state and an off state; and a first signal line and a second signal line which transfer the control signal outputted from the control circuit, to the main circuit. The value of the characteristic impedance (Z) of the first and second signal lines is set between the value of the output impedance (Z) of the control circuit and the value of the input impedance (Z) of the main circuit.

Switching device

A non-contact power feeding apparatus transmits, by at least magnetic coupling, an electric power in a non-contact manner to a power reception coil from a power transmission coil. The transmission coil is electrically connected to an alternating-current power source. The non-contact power feeding apparatus outputs an electric power to a load electrically connected to the power reception coil. The non-contact power feeding apparatus includes a coupling state estimator configured to estimate a coupling state between the power transmission coil and the power reception coil. The non-contact power feeding apparatus also includes an available output power calculator configured to calculate an available output power that can be output to the load, based on a limit value of a circuit element of a power feeding circuit including the power transmission coil and the power reception coil and on the coupling state.

Non-contact power feeding apparatus and non-contact power feeding method

There are provided with: a secondary windingto which an electric power is supplied in a non-contact manner from a primary windingby an alternating-current power source; a first circuit sectionconnected in parallel to the secondary winding; and a second circuit sectionconnected in series to a parallel circuit of the secondary windingand the first circuit section. An impedance of the first circuit sectionis larger than an impedance of the second circuit section.

Non-contact power feeding apparatus

A non-contact power supply device comprises: a primary winding (); and a secondary winding () to which an electric power is supplied from an alternating current power supply via the primary winding, wherein an impedance characteristic of Zwith respect to a frequency is such that a minimal value is provided in the proximity of a frequency of a fundamental wave component of the alternating current power supply and another impedance characteristic of Zwith respect to the frequency is such that the frequency of the fundamental wave component is provided between the frequency which is nearest to the frequency of the fundamental wave component and at which a maximal value is provided and the frequency which is nearest to the frequency of the fundamental wave component and at which the minimal value is provided.

Non-contact power supply device

A contactless power feeding apparatus includes a secondary winding to which power is supplied from a primary winding by an AC power supply. An impedance absolute-value characteristic of Zhas a frequency of a fundamental wave component to be between a frequency where a local maximum exists and that is nearest to the frequency of the fundamental wave component, and a frequency where a local minimum exists and that is nearest to the frequency of the fundamental wave component. An impedance absolute-value characteristic of Zhas the frequency of the fundamental wave component to be between a frequency where the local maximum exists and that is nearest to the frequency of the fundamental wave component, and a frequency where the local minimum exists and that is nearest to the frequency of the fundamental wave component.

Contactless power feeding apparatus

A non-contact charging device is provided with: a power receiving device which has at least a power receiving coil which receives electrical power, in a non-contact manner, from a power transmitting coil by means of a magnetic connection; a battery which is charged by the electrical power; a charge-state detection means, which detects the charge-state of the battery; a position detection means which detects the position of the power transmitting coil; and a charge time calculation means, which calculates a first charge time for the battery according to the charge-state as detected by the charge-state detection means and a first position of the power transmitting coil as detected by the position detection means.

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Yokohama, Japan

Throngnumchai Kraisorn