Hitachi Automotive Systems, Ltd.

Kohei Onda

Takuya Mayuzumi

Mitsuhiko Watanabe

Akira Mishima

Ayumu Hatanaka

Fumiaki Nasu

Disclosed is an electromagnetic valve driving circuit capable of reducing a load of a booster circuit. A boost driving FETis connected to a route formed between the booster circuitand a first terminal of an injector. A battery-side driving FETand a battery protection diode Db are connected to a route formed between a positive-polarity side of a power supply and the first terminal of the injector. A freewheeling diode Df is connected at a first terminal thereof to a portion between the first terminal of the injectorand the battery protection diode Db, and at a second terminal thereof to a grounding side of the power supply. An injector downstream-side driving FETis connected to a route formed between the second terminal of the injectorand the grounding side of the power supply. In addition to operating the FETs, andaccording to a level of a current which flows through the injector, a control circuitactivates the battery-side driving FETduring a period in which the boost driving FETrepeatedly turns on and off a plurality of times.

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Hitachi, Japan

Kohei Onda