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1. 发明授权

US5841202A EMI prevention circuit for a car-mounted electronic control unit 失效
标题翻译：用于车载电子控制单元的EMI防止电路
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。

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