Mitsubishi Electric Corporation

Mitsubishi Denki Kabushiki Kaisha

Masataka Yabuuchi

Hidetoshi Kitanaka

Keiji Nakatsu

Akihiko Iwata

Satoshi Azuma

Kengo Sugahara

Daisuke Itoh

The object is to effectively reduce the resonant current flowing inside a converter unit and an inverter unit in a power conversion apparatus for an electric vehicle. The power conversion apparatus includes a converter unit that converts an alternating-current power into a direct-current power, an inverter unit that converts the direct-current power into an intended alternating-current power and supplies the intended alternating-current power to an electric motor that drives an electric vehicle, a housing that accommodates the converter unit and the inverter unit and a part of which is connected to ground, and a magnetic core that is disposed inside the housing and that suppresses the resonant current flowing between the converter unit and the inverter unit.

Power conversion apparatus for electric vehicle

Provided is a controlling device for a railway electric car, the controlling device being able to detect a slipping/sliding phenomenon during, in particular, high-speed travel and to exercise slipping/sliding control in an appropriate manner. A slip controlling unitincludes a first adhesion level index generating unit and a second adhesion level index generating unit. In a normal slipping state in which an acceleration changes instantaneously, torque control is exercised by using a first adhesion level index generated by the first adhesion level index generating unit based on an acceleration deviation and a speed deviation. In a slipping state during high-speed travel, because the acceleration deviation and the speed deviation are small, torque control is exercised by using a second adhesion level index generated by multiplying the first adhesion level index by a gain equal to or smaller than 1 generated by the second adhesion level index generating unit.

Controlling device for railway electric car

A first threshold is determined, with reference to an absolute acceleration that is determined in accordance with a vehicle usage condition, to detect an acceleration change generated in acceleration of a self-axle speed that is a maximum speed (a minimum speed in a decelerating operation) of revolving speeds of plural motors that drive plural driving wheel axles. When the acceleration exceeds the first threshold, a system for generating a target torque command value reduced in accordance with the acceleration deviation is separated by setting an output of a comparator circuit to level '0', and a first-order delay circuit outputs the target torque command value subjected to a reduction process during a processing period designated by an output of a delay time generating circuit.

Electric train car controlling device

A cooling device for cooling a plurality of switching elements included in each of a converter unit and an inverter unit includes a fin base that serves as a switching element attachment plane on which the switching elements are mounted and a plurality of fins arranged on a plane opposite to the switching element attachment plane. When an electric power converting circuit is a single- or multi-phase bridge circuit including a plurality of sets of legs each formed with a positive-side arm and a negative-side arm, the switching elements constituting the legs of different phases are arranged in a row on the fin base in a traveling direction of a railway electric car.

Electric power converting apparatus

A pulsed power supply device in which a capacitor (,) having a charged voltage is discharged quickly upon closure of a switch (,). First and second series circuits (,) are connected to each other in series and provided between the output terminals of a DC voltage source (,). The first series circuit (,) is a series circuit of a first reactor (,) and a first forward-direction diode (,), and the second series circuit (,) is a series circuit of a second forward-direction diode (,) and a switch (,). A third series circuit (,) that is a series circuit of a capacitor (,), a second reactor (,), and a discharge tube (,) is connected in parallel to the second series circuit (,). Upon closure of the switch (,), the discharge tube emits light and, on the other hand, the capacitor (,) is discharged to produce an oscillation current, whereby a voltage develops across the capacitor (,) in the polarity opposite to the polarity at the time of the initial charging. Since this voltage is added to a power source voltage and reused in the next charging cycle, the pulsed power supply device has a high efficiency.

Pulsed power supply device

A small-sized pulsed power supply unit capable of being manufactured at low cost. A switch (4) is connected in parallel to a capacitor (5) and a discharge load (6) in such a manner that it forms a closed circuit together with a DC voltage source (1) and a reactor (2) when the switch (4) is turned on, so as to store electromagnetic energy in the reactor (2), and a closed circuit together with the reactor (2), the capacitor (5) and the discharge load (6) when the switch (4) is turned off, so as to charge the electromagnetic energy stored in the reactor (2) to the capacitor (5) as electrostatic energy at a charge voltage higher than an output DC voltage of the DC voltage source (1). A voltage detector (7) detects the voltage of the DC voltage source (1), and a current detector (8) detects a current flowing through the reactor (2). A control circuit (9A) switches on and off the switch (4) based on the detected voltage and the detected current.

Growing community of inventors

Tokyo, Japan

Masataka Yabuuchi