Kabushiki Kaisha Toshiba

Toshiba Corporation

Yosuke Nakazawa

Ryuta Hasegawa

Kazuaki Yuuki

Kentaro Suzuki

Tadashi Tokumasu

Kazuto Sakai

Masanori Arata

Ryoichi Kurosawa

Shun Taniguchi

Shinichi Toda

Masayuki Nogi

Yuusuke Kouno

Mikio Takabatake

Tomoyuki Makino

Ikuo Yasuoka

Takeru Murao

Yoshio Hashidate

Takeshi Kitahata

Hiroshi Mochikawa

Kazuya Yasui

Atsuhiko Kuzumaki

Katsuhisa Inagaki

Takashi Takagi

Daichi Suzuki

Satoshi Koizumi

Hitoshi Taguchi

Motoyasu Mochizuki

Teruyuki Ishizuki

Shinichi Noda

Nobumitsu Tada

Yushi Koyama

Makoto Takeda

Hiromichi Tai

Hiroaki Nakashima

Yoshinobu Nakamura

Jin Kato

Mitsuhiro Numazaki

Shunsuke Tamada

Kazuyasu Takimoto

Naotaka Iio

Kazuaki Yuki

Shoichi Irokawa

Takeru Koga

Tetsu Tone

Yoshinori Sugimoto

Takuro Arai

Kazuaki Fukuda

Kyungsoo Lee

Hisanori Shibata

Takahiko Minami

Masahiro Tsumenaga

Yuuki Tsukinari

Yosuke Kouno

In a power converter a DC positive terminal of a DC power supply is connected to a switching element, the DC negative terminal of the DC power supply is connected to a switching element. A capacitor and a capacitor connected in series are connected in parallel with the DC power supply, and a DC neutral point divided by the capacitor and the capacitor is connected to a switching element and a switching element. The switching element is connected to the positive terminal of a chopper cell group circuit, and the switching element is connected to the negative terminal of a chopper cell group circuit. The negative terminal of the chopper cell group circuit is connected to the positive terminal of the chopper cell group circuit, and the connection node therebetween serves as an output AC terminal.

Neutral point power converter with first and second chopper cell groups

A vehicle power conversion device includes a two-level converter, a three-level converter and one cooling device. The two-level converter includes a capacitor, first switching devices and second switching devices. The three-level converter includes two capacitors, third switching devices, fourth switching devices and a bidirectional switch. The first and second switching devices are embedded in first power modules, and the third and fourth switching devices are embedded in second power modules. The second power modules have dielectric strength voltages at least equal to a voltage applicable to any one of the two capacitors connected in series included in the three-level converter, and the first power modules have dielectric strength voltages at least equal to a sum of a voltage applicable to any one of the two capacitors connected in series included in the three-level converter and a voltage applicable to the capacitor included in the two-level converter.

Vehicle power conversion device

An electric power conversion apparatus according to an embodiment includes, wherein when a constituent element constituted of a leg in which two switching elements provided with self-arc-extinguishing capability are connected in series, and a capacitor connected in parallel with the leg is made a converter unit, and a constituent element formed by connecting one or more converter units in series is made a phase arm, a phase arm on the positive side, a single-phase four-winding transformer, and a phase arm on the negative side are included in each of three phases, one end of the phase arm on the positive side is connected to the positive side of a secondary winding of the four-winding transformer, and the other end thereof is connected to a DC positive side terminal.

Electric power conversion apparatus

According to one embodiment, there is provided a switching element driving power supply circuit that converts a main circuit voltage into a driving voltage of power-converting switching elements. The circuit includes a plurality of insulating power supplies, and a plurality of switching element driving power supply units. The insulating power supplies have respective direct-current input circuit ends connected in series, respective input-side circuits and output-side circuits insulated from each other, and respective output circuit ends connected in parallel. The power supply units are connected in parallel with the output circuit ends, and supplying power to the gate driving circuits of the power conversion switching elements.

Switching element driving power supply circuit

According to an embodiment, a power conversion apparatus for a vehicle is provided with a single-phase two-level converter and a single-phase three-level converter. The single-phase two-level converter is composed of a capacitor, first to fourth controllable switching devices, diodes connected in antiparallel with the controllable switching devices, respectively. The single-phase three-level converter is composed of two series-connected capacitors, fifth to tenth controllable switching devices, diodes connected in antiparallel with the controllable switching devices, respectively. The single-phase two-level converter and the single-phase three-phase converter are connected in series at the AC input/output points. The single-phase two-level converter has smaller switching loss than the single-phase three-level converter, and the single-phase three-level converter has higher withstand voltage property than the single-phase two-level converter.

Power conversion apparatus for vehicle and vehicle

An embodiment of an electric vehicle drive apparatus includes a rotary electric motor, an electromagnet apparatus, an electric motor controller, and an electromagnet controller. The rotary electric motor drives at least one wheel. The electromagnet controller generates at least one of an attraction force between a rail and a bogie, and a propulsion force. The electromagnet controller controls the electromagnet apparatus. The rotary electric motor and the electromagnet apparatus are provided on the same bogie.

Electric vehicle drive apparatus, method of driving an electric vehicle, and program

A power conversion apparatus comprises a first converter connected to a second converter. The first converter includes a first capacitor and the second converter includes a second capacitor connected in series to a third capacitor. The capacitors are each connected in parallel with a respective resistor. The power conversion apparatus also includes a bypass switch connected in parallel to the first converter and in series to the second converter. A control module is configured to control a single-phase output voltage by operation of the first converter, the second converter, and the bypass switch.

Power conversion apparatus

A control system for controlling a synchronous motor having a magnet in a rotor includes an inverter configured to output an AC current for driving the motor, a gate command generating unit configured to generate a gate command for controlling the inverter, a current detecting unit configured to detect the AC current output by the inverter, a magnetic pole position estimating unit configured to estimate a magnetic pole position based on the AC current detected by the current detecting unit and generate an estimation signal, a current command generating unit configured to generate a current command and an estimation command for controlling the inverter to output an AC current with a predetermined level, and a magnetic polarity determination unit configured to determine the polarity of the magnet based on the estimation signal.

Magnetic polarity determination device, permanent magnet synchronous motor control device, and magnetic polarity determination method

A reactive power compensator according to an embodiment comprises: multilevel inverter circuits respectively constituting each of the three phases; a filter circuit for reducing harmonics connected between the output terminals of each of the multilevel inverter circuits and a power system interconnection terminal; and a control section for causing prescribed three-phase AC voltage to be output by controlling each of said multilevel inverter circuits. Each of the multilevel inverter circuits is constituted by connecting in series one or more single-phase full-bridge single-pulse inverters and is arranged to convert DC voltage to respective positive and negative single-pulse voltages once per cycle of the fundamental wave of the voltage instruction value.

Multilevel reactive power compensator

An inexpensive and space-saving power conversion device is provided which can eliminate a high-cost and large reactor like a buffer reactor. A device includes multiple switching elementsperforming conversion between DC and AC upon switching, a unitary unit C including the switching elements, and a capacitor, and unit armsP,N each including at least one unitary unit C. The primary side of a transformeris connected between the pair of unit armsP,N so as to suppress a short-circuit current by a leakage inductance component.

Power conversion device

In one embodiment, an electric power converting device includes a converter which converts a three-phase AC voltage output from a three-phase AC power source, into a DC voltage of each phase of a three-phase AC load, and an inverter which converts the DC voltage converted by the converter, into a single-phase AC voltage of each phase of the three-phase AC load. The converter includes for each phase of an electric power system a circuit which consists of a plurality of switching elements connected in series. The electric power converting device controls on/off of a switching element corresponding to one of phases of the electric power system in the converter such that a voltage which reduces fluctuation of a DC voltage applied between the converter and the inverter and corresponding to each phase of the three-phase AC load is output from the converter for each phase of the electric power system.

Electric power converting device and electric power converting method

According to one embodiment, a semiconductor switch includes a main element including a switching element and an antiparallel diode, and a reverse voltage application circuit. The reverse voltage application circuit includes an auxiliary electric-power supply, a high-speed free wheeling diode, an auxiliary element, and a capacitor. The high-speed free wheeling diode comprises a plurality of diodes connected in series.

Semiconductor switch having reverse voltage application circuit and power supply device including the same

Disclosed herein are electric vehicle control device which can distribute the heat generated by the semiconductor devices in the DC/AC converter efficiently. Also disclosed herein are methods of converting DC to AC while keeping the heat value of the semiconductor devices stable.

Electric vehicle control device

According to one embodiment, four VVVF main circuit inverters for supplying electric power to drive a permanent-magnet synchronous motor are packaged into one unit. The four VVVF main circuit inverters are configured as a 4-in-1 inverter unit which shares a cooling mechanism for radiating heat generated due to power supply operation for the permanent-magnet synchronous motors to outside. A 2-in-1 semiconductor device package in which two semiconductor elements to convert electric power are packaged into one unit to be able to drive a permanent-magnet synchronous motor is contained in the 4-in-1 inverter unit. Thereby, individual control of inverters and reducing the size of the entire apparatus can be achieved for the electric-vehicle control apparatus.

Electric-vehicle control apparatus

A breakeris opened when a pantographis lowered. The pantographis connected to an overhead wire. Voltage and its phase of the overhead wire are detected by a detector. Power is supplied from a power storage deviceto a tertiary windingvia a power convertersuch that a primary side of the main transformerhas the same voltage and phase as the overhead wire so as to reversely excite the main transformer. When the voltage of the main transformerhas the same phase as the voltage of the overhead wire, the breakeris turned on and then the pantographis raised, to connect the overhead wireand the main transformerto each other, thereby preventing the occurrence of an excitation inrush current to the main transformer

Rolling stock system and control method thereof

Growing community of inventors

Tokyo, Japan

Yosuke Nakazawa