Kabushiki Kaisha Toshiba

Toshiba Infrastructure Systems & Solutions Corporation

Ryuichi Morikawa

Mami Mizutani

Shinichiro Kosugi

Nobuo Shibuya

Ryuta Hasegawa

Shuji Ono

Kazuto Kuroda

Hiroshi Mochikawa

Masayuki Kubota

Hiroshi Uchino

Yukitaka Monden

Takafumi Nakahama

Yuki Kuwano

Masahiro Tohara

Nobumitsu Tada

Kazuhide Ashida

Tadashi Nishikawa

Fumiyuki Yamane

Yushi Koyama

Takashi Akiba

Kiyoshi Kusunoki

Yasuyuki Ito

Masami Hirata

Koji Maki

Takeo Kanai

Yasuhiro Miyamoto

Shunsuke Tamada

Takuro Arai

Toshiharu Oobu

Takeo Kakuchi

According to an embodiment, there is provided an apparatus which can hold down an energy loss and can avoid an increase in size. The apparatus includes a cell including a floating capacitor connected in parallel to an upper-side switching element and a lower-side switching element; an upper arm include including first switch circuits, each including a first switching element, a first diode and a first capacitor, are connected in series; a lower arm including second switch circuits, each including a second switching element, a second diode and a second capacitor, are connected in series; and a circuit which connects a low-side terminal of the cell and a low-side terminal of the first capacitor and connects a high-side terminal of the cell and a high-side terminal of the second capacitor.

Power conversion apparatus

Provided is a battery system capable of preventing the voltage that is applied to the voltage detection circuit from exceeding the withstand voltage of the voltage detection circuit when the connection between the cells in the battery module is disconnected, and preventing an overcurrent from flowing in the cell voltage detection circuit and the module. The modules are internally provided with a battery voltage measurement circuitfor measuring the voltage of each cell. A reverse voltage protective diodeis disposed in the power supply route of the battery voltage measurement circuit, and adapted such that the anode thereof is connected to the negative electrode of a drive power source of the voltage measurement circuit and the cathode thereof is connected to the positive electrode of the drive power source of the voltage measurement circuit. A fuseas an overcurrent protective element is provided to the power supply route of the battery voltage measurement circuit

Battery system

According to one of the embodiment, an assembled battery has a plurality of cells electrically connected in series. A charge amount difference detection circuit detects charge amount difference of the cells. Wherein, while a charging or discharge current is being applied to the cells, the charge amount difference detection circuit detects charge amount differences greater than a charge amount of a reference cell having a minimum charge amount, the charge amount differences of the cells are determined by addition of the charging or discharge currents during a period corresponding to the time differences between the reference cell and the other cells reaching a predetermined specific voltage, discharge switches are controlled by a switch controller, based on the charging amount differences.

Assembled battery unit and vehicle

A battery system includes a battery unit in which battery arms are connected in parallel, and a charge/discharge control device that controls charge/discharge of the battery unit. Each of the battery arms includes: a battery composed of one or more battery cells connected in series; a switch connected in series to the battery; and a battery monitoring device that, in a case of having detected abnormality of the battery, opens the switch to thereby isolate the battery arm including the abnormal battery, and sends a switch opening signal indicating that the switch has been opened to the charge/discharge control device. The charge/discharge control device performs a control to reduce a charge/discharge current or charge/discharge power of the battery unit when the switch opening signal is sent from the battery monitoring device of the battery unit to the charge/discharge control device.

Battery system using battery unit in which battery arms are connected in parallel

According to one embodiment, the power supply management portion includes a timer configured to output an ON signal every time set by the control circuit, an OR circuit configured to receive supply of an output signal from the timer, an external signal supplied from outside, and a switch control signal output from the control circuit, and a switch circuit configured to switch output of the power source voltage from an external power source according to an output signal from the OR circuit, and the control circuit turns on a switch control signal after confirming which of the output signal from the timer or the external signal has turned on the switch circuit and turns off the switch control signal when both of the output signal from the timer and the signal supplied from outside are turned off.

Secondary battery device and vehicle

A torque limit section that applies limit to a torque instruction value of an electric motor such that a switching elements temperature is restricted to no more than an element upper limiting temperature includes a torque restriction section that finds a torque restriction value for restricting the torque of the electric motor in accordance with the said switching elements temperature; a torque restriction mitigation section that finds a torque restriction mitigation value for mitigating the torque limit value in accordance with the integrated value of the deviation of the element upper limiting temperature and the switching elements temperature; a first subtractor that finds a torque restriction value by subtracting the torque restriction mitigation value from the torque limit value; and a second subtractor that finds a limited torque instruction value obtained by subtracting the torque limit value from the torque instruction value and outputs this to the gate generating section.

Inverter device, electric automobile in which the inverter device is mounted, and hybrid automobile in which the inverter device is mounted

According to one embodiment, a temperature detection circuit is provided which requires only a small number of additional components, thus minimizing an increase in costs and which offers an insulating property and high responsiveness. A temperature detection circuit outputs a first PWM signal corresponding to a temperature of a first temperature sensor from a photointerrupter as a signal insulated from the first temperature sensor. A temperature detection circuit outputs a second PWM signal corresponding to a temperature of a second temperature sensor from a photointerrupter as a signal insulated from the second temperature sensor. A controlling arithmetic apparatus calculates a higher one of the temperatures detected by the first and second temperature sensors based on the PWM signals output from the photointerrupter.

Temperature detection circuit

A digital signal transfer device generates from a modulating section () a modulated signal responsive to a digital input signal and transfers this to a demodulating section () through a pulse transformer (). The demodulating section () generates from the modulated signal an output signal in which the digital input signal waveform is restored.

Digital signal transfer device

A control apparatus for a power converter having a plurality of semiconductor switching devices that converts DC power into AC power and outputs three levels of voltages, including a command voltage generator configured to output a command voltage vector that represents a voltage to be output from the power converter, an integrator configured to calculate a difference integral vector by integrating a difference between the command voltage vector and an output voltage vector that represents a voltage command for the power converter, a difference vector calculator configured to calculate difference vectors by subtracting the command voltage vector from each of the possible output voltage vectors, a vector selector configured to select one of the possible output voltage vectors which corresponds to one of the difference vectors making the largest angle with the difference integral vector as the output voltage vector only if the difference integral vector exceeds a predetermined value, and a gate signal generator configured to determine one of switching states that includes a plurality of ON-OFF pattern signals for turning on and off the semiconductor switching devices on the basis of the output voltage vector.

Control apparatus for power converter

The controller for a power converter of the present invention, connects a transformer in series with the AC system, and has devices which find the voltage drop portion generated by the impedance of this transformer when introducing a voltage in series by an inverter into the above-mentioned AC system via this transformer, and control the output of the above-mentioned inverter to compensate this voltage drop portion.

Controller for power converter

Growing community of inventors

Higashimurayama, Japan

Ryuichi Morikawa