Fuji Electric Co., Ltd.

Central Japan Railway Company

Ayako Saga

Toshiaki Murai

Tadashi Sawada

Yoshiyasu Hagiwara

Tomotaka Nishijima

Masayuki Tobikawa

Koji Maruyama

Michio Tamate

Kotaro Yamazawa

Toshiya Kaneko

Toshiyuki Nakata

Tomoki Uruma

Tomonori Tsunawaki

Hiroki Matsuoka

Daiki Ishimaru

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

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

Tokyo, Japan

Ayako Saga