Title:
車載用コントロールユニットのEMI用接地構造
Document Type and Number:
Japanese Patent JP3581971
Kind Code:
B2
Abstract:
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.
Inventors:
Yoichi Noguchi
Nobuo Sasakake
Hiroshi Osawa
Nobuo Sasakake
Hiroshi Osawa
Application Number:
JP15016796A
Publication Date:
October 27, 2004
Filing Date:
May 22, 1996
Export Citation:
Assignee:
Bosch Automotive Systems, Inc.
International Classes:
H04B15/04; H05K1/02; B60R16/02; H05K9/00; (IPC1-7): H05K9/00; B60R16/02
Domestic Patent References:
| JP1125595U | ||||
| JP4354111A | ||||
| JP1070397U | ||||
| JP55141841A |
Attorney, Agent or Firm:
Noboru Tsukada