Mitsubishi Electric Corporation

Naoki Moritake

Masaru Kobayashi

Matahiko Ikeda

Hirotoshi Maekawa

Takao Mitsui

Nobuhiro Kihara

Tomohiro Kimura

Ryota Kondo

Ryuichi Ishii

Satoshi Ishibashi

Yuta Komatsu

Toshinori Yamane

Shinsuke Idenoue

Mai Uenaka

Kazunari Masudome

Kenji Matsuda

An upper switching device and a lower switching device in an electric-power conversion unit are separately driven to close by an upper closing command signal and a lower closing command signal, respectively, generated by a calculation control unit; in response to occurrence of an excessive current abnormality or an excessive voltage abnormality, upper and lower selection circuits and a penetration prevention circuit provided in a signal path select an upper three-phase short-circuiting command signal or a lower three-phase short-circuiting command signal, or an upper-and-lower six-phase cutoff command signal, and a penetration prevention time prohibits upper and lower switching devices from being concurrently closed; when an excessive voltage abnormality occurs, the three-phase short-circuiting command signal is immediately generated, without an advanced cutoff operation being performed. As a result, excessive-voltage breakage of the circuit components is prevented.

Motor control apparatus

An object of this invention is to obtain a control apparatus and a control method for a DC/DC converter, with which a DC/DC converter can be controlled with superior stability and responsiveness while reducing the size of a storage medium. A calculation value is calculated in accordance with a specific control method using a differential voltage between a target output voltage and an output voltage, whereupon a control calculation value is calculated from the calculation value and an input voltage.

Control apparatus and control method for DC/DC converter capable of bidirectional power transfer

A power converter has one set of two semiconductor switches performing switching actions, each of which is formed of an FET and a free wheel diode connected in anti-parallel to the FET, and a smoothing capacitor, and convers power by complementary switching actions of the FETs in the semiconductor switches. The power converter is provided with a current sensor that detects a direction of a current flowing through the semiconductor switches and a gate generation portion that skips ON signals of PWM gate signals of the semiconductor switches when the direction of the current flowing through the semiconductor switches is negative.

Power converter using a field effect transistor and a diode

Disclosed is a DC-DC power conversion apparatus () including two or more switching units (SU, SU) each of which further includes two semiconductor switching elements (Sa, Sb), and wherein each of the semiconductor switching elements (S, S, S, S) of each of the switching units are all connected in series, and which also includes an energy transition capacitor (C) for conducting charging/discharging, and an inductor (L). The DC-DC power conversion apparatus () is also provided with a control unit that makes the semiconductor elements execute operations in four types of switching modes, according to the ratio (V/V) of the input/output voltages of the power conversion apparatus and the direction of the power transmission, and that also makes the elements carry out a current-discontinuing operation wherein the inductor current will become zero during switching operation, upon low load.

DC-DC power conversion apparatus

The invention provides a reactor to be built in a power converter. In the reactor, an induction component composed of a coil being a winding of a conductor wire, a core in which interior a magnetic path is formed and an insulation bobbin positioning and engaging a wire wound part of the coil is housed in a case to be soaked with a mold resin. Inner bottom face of the case has a plurality of surfaces having not less than two different heights letting the outside bottom of the case a reference surface, and the lower end face of the core is in contact with any of the case inner bottom surfaces excluding the lowest inner bottom surface. As a result, the reactor is suitable for on-vehicle applications to achieve reduced article variation as well as a longer service life, a shorter operation time and decreased cost.

Reactor

Growing community of inventors

Chiyoda-ku, Japan

Naoki Moritake