公开(公告)号：US5841202A

公开(公告)日：1998-11-24

申请号：US856580

申请日：1997-05-15

申请人： Yoichi Noguchi ,  Nobuo Sasagake ,  Hiroshi Ohsawa

发明人： Yoichi Noguchi ,  Nobuo Sasagake ,  Hiroshi Ohsawa

IPC分类号： B60R16/02 ,  H04B15/04 ,  H05K1/02 ,  H05K9/00 ,  F02P15/00

CPC分类号： H05K9/0066 ,  H04B15/04 ,  H05K1/0216 ,  H05K1/0215 ,  H05K1/0231 ,  H05K2201/093 ,  H05K2201/09663 ,  H05K2201/09781

摘要： 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.

摘要翻译： EMI防止电路具有接地到车体的第一接地图案​​和通过EMI电容器连接到第一接地图案​​的第二接地图案。 大电流流过的大电流接地线通过EMI电容器连接到第一接地图案​​。 其中小电流流动的小电流接地线直接连接到第二接地图案，而不在其间使用任何EMI电容器。 因此，即使第一接地图的接地电位由于驱动大电流负载而发生噪声而波动，由于第二接地图案直接连接到汽车电池的接地侧，所以保持第二接地图案 处于汽车电池的地电位并且不波动。 此外，当从无线电通信装置和便携式电话机入侵任何高频噪声时，由于第二接地图案通过EMI电容器连接到第一接地图案​​，所以高频噪声被排放到车体 通过第一个地面图案。