Kabushiki Kaisha Yaskawa Denki

Yaskawa America, Inc.

Kenji Mitsuda

Taisuke Katayama

Hiroshi Takagi

Eiji Yamamoto

Takashi Tanaka

Thomas Bryan Sasada

An inverter system includes an inverter apparatus and a smoothing capacitor charging-power apparatus. The inverter apparatus includes a transformer and an inverter cell. The transformer includes primary windings and secondary windings. Each of the inverter cells includes a converter circuit, a smoothing capacitor, and an inverter circuit. The converter circuit is configured to convert an intermediate alternating-current voltage to a direct-current voltage. The smoothing capacitor is configured to smooth the direct-current voltage. The inverter circuit is configured to at least partially generate a phase voltage of a variable alternating-current voltage from the direct-current voltage smoothed by the smoothing capacitor. Electric power is to be supplied from a second power supply different from a first power supply to the smoothing capacitor charging-power apparatus. The smoothing capacitor charging-power apparatus is electrically connected to the primary windings to supply initial charging power to the smoothing capacitor via the primary windings and the secondary windings.

Inverter system, inverter apparatus, and method of controlling inverter system

A power conversion apparatus includes a power conversion device connected to a 3-phase AC power source, a first fuse positioned on a first phase of the source between the conversion device and the source, a second fuse positioned on a second phase of the source between the conversion device and the source, a first voltage detection device which detects first voltage between a third phase and the first phase of the source on the conversion device side with respect to the first fuse, a second voltage detection device which detects second voltage between the third and second phases of the source on the conversion device side with respect to the second fuse, and a status detection device connected to the first and second voltage devices such that the status device detects status of the first and second fuses based on comparison between detection result of the first and second voltage.

Power conversion apparatus, status detection device, and method for status detection

A power conversion device according to an aspect of an embodiment includes a power conversion unit and a control unit. The power conversion unit includes N (N is an integer number not less than two) power converters that output voltages on the basis of base signals having the same period and phase differences equivalent to &#xbd;N of the period of the base signal. The control unit controls the N power converters by using &#xbd; of the period of the base signal as a control period and shifts each of control timings of the N power converters by the &#xbd;N of the period of the base signal.

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Kitakyushu, Japan

Kenji Mitsuda