Kabushiki Kaisha Toshiba

Mitsubishi Paper Mills Limited

Mitsubishi Electric Corporation

Toshiyuki Baba

Yuusuke Kouno

Yuichiro Nozaki

Yasuomi Maki

Tsunehito Fujita

Isao Ebihara

Masanori Yasue

Masatoshi Minegishi

An auxiliary power supply device according to an embodiment includes a high-frequency transformer; a chopper to convert a DC power; an inverter to convert output power of the chopper into AC power and supply the AC power to the high-frequency transformer; a DC capacitor connected to a DC end of the inverter; a resonant capacitor to generate a resonance according to switching of the inverter; a rectifier to convert, into DC power, the AC power supplied from the inverter via the high-frequency transformer; and a controller to calculate a resonant frequency of a resonant circuit including the resonant capacitor based on a value supplied from a detector and detect a decrease in capacity of the resonant capacitor using the resonant frequency and the value of the DC input current.

Auxiliary power supply device having resonant circuit

In an electric power conversion device according to an embodiment, a chopper converts electric power from a power supply into direct-current power. An inverter converts the direct-current power into alternating-current power. Pairs of resonant capacitors are connected to a direct-current input section of the inverter. Each of the pairs is in series. Primary windings of high-frequency transformers are connected to the inverter and respective midpoints of the pairs of resonant capacitors. The high-frequency transformers convert the alternating-current power of the inverter. Rectifiers convert alternating-current power supplied from secondary windings of the high-frequency transformers into direct-current power. One or more voltage detectors detect output voltage of one or more of the rectifiers. A control device controls the chopper on the basis of output of the voltage detectors such that an output voltage of the direct-current power comes to a predetermined voltage value.

Electric power conversion device and control method of electric power conversion device

A non-woven glass fiber-containing sheet composed of a top layer of a mixture of glass fiber with other fiber and a back layer of a mixture of fiber other than glass fiber with polyvinyl chloride fiber or polyvinyl chloride latex flocculate is a suitable substrate for processing it into flooring, walling, roofing, etc. by impregnating it with a polyvinyl chloride sol to strengthen the sheet without exudation of the sol onto the back layer surface.

Glass-containing sheet substrate

Growing community of inventors

Tokyo, Japan

Toshiyuki Baba