Hitachi Automotive Systems, Ltd.

Ryusuke Sahara

Taizo Yamawaki

Atsushi Arata

Hiroki Yamashita

Mitsuhiko Watanabe

Ming Liu

Yasushi Sugiyama

Tomohiko Yano

Kenichi Hoshino

A power supply apparatus that can realize ripple reduction, and an electronic control unit including the power supply apparatus are provided. In view of this, a PWM controller generates a PWM signal, and a PFM controller generates a PFM signal having a phase independent of the PWM signal. A level-fixed period generating circuit sets a level-fixed period having a start timing at a selection timing set to an edge of the PFM signal. A mode selecting circuit selects, at the selection timing and as a switching control signal, the PWM signal instead of the PFM signal, and controls a logic level of the switching control signal in the level-fixed period starting at the selection timing, such that the logic level becomes a fixed logic level.

Power supply apparatus and electronic control unit

A load drive system for driving a load supplied with power from a power line includes a control unit which controls switching between the power line and the load and a communication unit which communicates using voltage and current of the power line. When performing the switching, the control unit controls, based on a width of a transition period of the power-line current, the transition period being attributable to the switching, timing of the switching so as to move the transition period away from a center of a period corresponding to a symbol communicated by the communication unit.

Load drive system and load drive method

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Ibaraki, Japan

Ryusuke Sahara