Hitachi, Ltd.

Hitachi Automotive Systems, Ltd.

Masahiro Seo

Toshiyuki Ajima

Takafumi Hara

Shigehisa Aoyagi

Hiroshi Kamizuma

Tetsuya Kawashima

Masaki Kashima

Yawara Kato

Hangxian Gao

There is provided a power conversion apparatus including a first power semiconductor module, a second power semiconductor module, a control circuit for driving the first power semiconductor module and the second power semiconductor module, and liquid-cooling type cooling jackets, wherein the second power semiconductor module is disposed closer to an upper surface in the gravity direction than the first power semiconductor module is, the cooling jackets include a refrigerant containing hydrogen molecules and a refrigerant flow path at least between the first power semiconductor module and the second power semiconductor module, and the control circuit performs control such that the operating time period of the second power semiconductor module is shorter than the operating time period of the first power semiconductor module.

Power conversion apparatus

A motor driving device controls driving of an inverter device, detects current values in two phases, and compensates a value. The motor driving device detects current values in two phases, namely, a maximum phase current value and a minimum phase current value, within a single cycle of a PWM carrier frequency. The motor driving device compensates a value obtained by subtracting an absolute value of a difference between two absolute values, namely, the detected maximum phase current value and minimum phase current value, from the smaller value of the absolute values, as the offset current component.

Inverter driving device, electric brake apparatus, and electric power steering apparatus

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Tokyo, Japan

Masahiro Seo