Central Japan Railway Company

Fuji Electric Co., Ltd.

Toyo Electric Mfg. Co., Ltd.

Yoshiyasu Hagiwara

Toshiaki Murai

Tadashi Sawada

Masayuki Tobikawa

Tomotaka Nishijima

Ayako Saga

Yuki Kashiwagi

Koji Maruyama

Yukio Takahashi

Michio Tamate

Daisuke Shimode

Takehisa Kashima

Toshiya Kaneko

Takayoshi Tanaka

An equivalent circuit of a converter () is represented by a series connection between an equivalent capacitor () and an equivalent resistor (), and the converter () includes a controller that adjusts a power factor of the input power by controlling a capacitive reactance (Xc) of the equivalent capacitor ().

Converter and power receiving apparatus

Provided is a coil mounting structure for a device that comprises a primary coil to be supplied with an alternating current, and a secondary coil arranged facing the primary coil and configured to supply an electric power to a load provided in a housing by using an induced voltage generated by an electromagnetic field produced by the primary coil. The coil mounting structure comprises at least one mounting part provided in a region of the housing, the region facing the primary coil, and the at least one mounting part is configured to hold the secondary coil to the housing. The at least one mounting part comprises at least one gap area configured to interrupt a circuit generated by the at least one mounting part.

Coil mounting structure

In a power supply device, the bridge circuit is configured by connecting, in parallel, a plurality of series circuits of an inverse-parallel connection circuit of a semiconductor switch and a diode. A control unit controls switching of a semiconductor switch so that a voltage v between AC terminals becomes zero voltage in equal periods &#x3b1; before and after a center point shifted from one zero crossing point in one cycle of the input current by a compensation period (angle) &#x3b2; calculated from a voltage applied to a resonance circuit constituted by the power receiving coil and a resonance capacitor Cand an induced voltage of the power receiving coil, and becomes a positive-negative voltage whose peak value is the voltage Vbetween DC terminals in other periods.

Power supply device

An electric power receiving device in one aspect of embodiments of the present disclosure comprises an electric power receiving section and a converting section. The converting section comprises a compensation voltage generating section. The compensation voltage generating section generates a compensation voltage capable of canceling out a reactance component in the electric power receiving section, and applies the compensation voltage to the electric power receiving section. The compensation voltage generating section comprises a phase changing section, a physical quantity detecting section, and a searching section. The searching section searches a target phase of the compensation voltage that brings the electric power receiving device into a substantially resonant state, based on a physical quantity detected by the physical quantity detecting section. The compensation voltage generating section determines the compensation voltage having the target phase as the compensation voltage to be applied to the electric power receiving section.

Electric power receiving device and method of receiving electric power

In a power supply device, the bridge circuit including a plurality of switching arms which is an inverse-parallel circuit of a semiconductor switch and a diode. The power supply device includes a control unit. The control unit switches the semiconductor switch such that a voltage v between AC terminals becomes a positive-negative voltage whose peak value is the voltage Vbetween the DC terminals only during prescribed time periods before and after a point that has deviated from each zero crossing point ZCP of a current i by a prescribed compensation period &#x3c6; and such that the voltage v between the AC terminals becomes a zero voltage during the other time periods, and sets the compensation period &#x3c6; such that a time period during which the voltage v between the AC terminals becomes a zero voltage is the shortest.

Power supply device with a resonant bridge circuit control unit

Growing community of inventors

Kanagawa, Japan

Yoshiyasu Hagiwara