Hitachi Automotive Systems, Ltd.

Hitachi Astemo Ltd.

Eigo Kishimoto

Takae Shimada

Fumihiro Sato

Kenji Kubo

Hiroyuki Shoji

Takayuki Oouchi

Shintaro Tanaka

Kohei Myoen

Takuya Ishigaki

Naoya Takahashi

Takayuki Ouchi

Shinyu Ko

A first torque calculation unitcalculates torque TQ_DC currently generated by a motorbased on a DC current DC. A second torque calculation unitcalculates torque TQ_UVW currently generated by the motorbased on U-phase, V-phase, and W-phase currents. A torque limit calculation unitcalculates a torque limit TQ_LMTusing a torque limit characteristic map measured in advance based on a current limit DC_LMT. A torque limit correction unitcompares first torque TQ_DC with second torque TQ_UVW to calculate a torque variation degree KP. Then, the torque limit TQ_LMTis corrected using the variation degree KPto calculate a torque limit TQ_LMT. As a result, even if required torque reaches the torque limit, the DC current does not exceed the current limit, and the output of the motor can be fully utilized by approaching the current limit.

Motor control device

An object of the present invention is to provide a highly efficient power supply device. A power supply deviceaccording to the present invention includes a bidirectional DC-DC converterand an insulated DC-DC converter. The bidirectional DC-DC converterreceives a main batteryand outputs a direct-current link voltage Vlink. The insulated DC-DC converterreceives the link voltage Vlink and supplies power to a load. The link voltage Vlink, which is an output of the bidirectional DC-DC converter, changes according to the output voltage of the insulated DC-DC converter

Power supply device

An object of the present invention is to provide a charging apparatus having high efficiency of charging a battery by inputting an alternating current voltage. A charging apparatus that charges a direct current battery includes a step-down converter unit to which a direct current voltage from a power supply is input and that converts the direct current voltage, and when a voltage of the direct current battery is between a predetermined first voltage smaller than a charge completion voltage of the direct current battery and the charge completion voltage, a variable voltage that increases from the first voltage to the charge completion voltage in accordance with charging of the direct current battery is input to the step-down converter unit.

Power supply apparatus

Provided is a power source device having a high efficiency. A power source deviceincludes an insulated AC-DC converterwhich receives a voltage of an AC power sourceand outputs a link voltage Vlink, a bidirectional DC-DC converterwhich receives the link voltage Vlink to charge a main battery, an insulated DC-DC converterwhich receives the link voltage Vlink to supply power to a load, an operation mode in which the power is supplied from the AC power sourceto the main battery, and an operation mode in which the power is supplied from the main batteryto the load

Power source device

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Hitachinaka, Japan

Eigo Kishimoto