Mitsubishi Electric Corporation

Yutaka Kuboyama

Hirokazu Nakabayashi

Ryota Kondo

Kikuo Izumi

Naoki Nishio

Yusuke Higaki

Takahiro Kato

Shoji Morita

A charging device for charging a storage battery mounted on an electric vehicle includes: a first relay to generate a communication start signal for causing communication between the charging device and the electric vehicle to be started; a cable including a connector for connection to a plug of the electric vehicle at one end to electrically connect the charging device and the electric vehicle; a signal line included in the cable and connected to the first relay; a power supply circuit to pass a current to the signal line when the connector is connected to the plug; a current detection circuit to detect a current flowing in the signal line; and a controller to control the first relay and start the communication when the current detection circuit detects the current.

Charging device and charging/discharging device

A power conversion system includes one power conversion device and one or more power conversion devices. The power conversion device includes a power converter that controls output voltage to be a preset voltage to apply the preset voltage to a load on the basis of an output from a power supply. The power conversion device controls the power converter so that a detected value of the first voltage detected by a voltage detector becomes a preset voltage value. The power conversion devices each include a power converter that controls output current to be a preset current to supply the preset current to the load on the basis of an output from a power supply. The power conversion devices each controls operation of the power converter on the basis of the detected value of the first voltage. The power conversion device controls operation of the power converter by changing the first voltage.

Power conversion system

A power conversion device includes a power converter connected to an electrical storage device that stores DC power, and having a function to convert the DC power stored in the electrical storage device into AC power, and also having a function to output the AC power to one or both of a customer load and a power system; a detection unit that detects voltage and current at a first point on a power line that connects the power converter with the power system; and a control unit that generates a drive command for controlling the power converter based on the voltage and the current detected by the detection unit. The customer load is connected to a second point, on the power line, between the power converter and the first point. The power converter operates on the basis of the drive command generated by the control unit.

Power conversion device

A power management system for supplying generated power from a solar cell, which is the power generator, to a power grid and a storage battery, which is the power storage device, includes a controller that controls charging power supplied to the storage battery and output power from the solar cell in order for the generated power not to flow backward to the power grid; a voltage monitoring unit that monitors the voltage of the power grid; and a current monitoring unit that monitors the current from the power grid. The controller controls the charging power sent to the storage battery in accordance with power purchased from the power grid on the basis of the voltage and the current; and the storage battery and the solar cell are controlled in accordance with different thresholds of purchased power.

Power management system

A temperature estimation device calculates a first estimation temperature of a reactor on the basis of a reference estimation temperature to which a first lag period is provided and outputs from a temperature change amount calculation unit to which a second lag period is provided, predicts a second temperature change amount of the reactor over a predetermined period on the basis of the first estimation temperature, and then predicts a second estimation temperature of the reactor.

Growing community of inventors

Tokyo, Japan

Yutaka Kuboyama