Zexel Gmbh

Yoichi Noguchi

Hiroshi Ohsawa

Nobuo Sasagake

An EMI prevention circuit has a first ground pattern grounded to a car body and a second ground pattern connected to the first ground patter by way of an EMI condenser. A large-current ground line through which a large current flows is connected to the first ground pattern by way of an EMI condenser. A small-current ground line in which a small current flows is directly connected to the second ground pattern without using any EMI condenser in between. Because of this, even when a ground potential of the first ground pattern fluctuates by a noise due to driving a large-current load, since the second ground pattern is directly connected to a ground side of a car battery, the second ground pattern is maintained at a ground potential of the car battery and does not fluctuate. Also, when any high-frequency noise invades from a radio communication set and a portable telephone set, since the second ground pattern is connected to the first ground pattern by way of an EMI condenser, the high-frequency noise is discharged to the car body through the first ground pattern.

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Higashimatsuyama, Japan

Yoichi Noguchi