公开(公告)号：DE10019696B4

公开(公告)日：2007-06-06

申请号：DE10019696

申请日：2000-04-20

Applicant: INT RECTIFIER CORP

Inventor： DUBHASHI AJIT ,  VAYSSE BERTRAND

IPC: H02M1/12 ,  H02M1/14 ,  H02M1/44 ,  H02M5/45 ,  H02M7/00 ,  H02P23/00

Abstract: Conductive EMI in motor drive circuits is reduced by interposing inductors in the ground line. The common mode current enters the motor drive circuit through the two supply leads and leaves the system through the ground lead. The ground current typically is very high frequency but very low in rms amperage. Interposing an induction (low current, very high L) in the ground line advantageously reduces EMI. The inventive method reduces.or eliminates the need for filtering capacitors across the rectifier of the motor drive circuit. In addition, the inventive method minimizes the common mode choke to merely a wraparound ferrite core over the input wires. EMI emissions are reduced further by sandwiching ground traces along with power traces and connecting to.the heat sink with the shortest possible route. This reduces the ground loop area, which consequently reduces emissions.

公开(公告)号：DE10019696A1

公开(公告)日：2001-10-04

申请号：DE10019696

申请日：2000-04-20

Applicant: INT RECTIFIER CORP

Inventor： DUBHASHI AJIT ,  VAYSSE BERTRAND

IPC: H02M1/12 ,  H02M1/14 ,  H02M1/44 ,  H02M5/45 ,  H02M7/00 ,  H02P23/00

Abstract: Conductive EMI in motor drive circuits is reduced by interposing inductors in the ground line. The common mode current enters the motor drive circuit through the two supply leads and leaves the system through the ground lead. The ground current typically is very high frequency but very low in rms amperage. Interposing an induction (low current, very high L) in the ground line advantageously reduces EMI. The inventive method reduces.or eliminates the need for filtering capacitors across the rectifier of the motor drive circuit. In addition, the inventive method minimizes the common mode choke to merely a wraparound ferrite core over the input wires. EMI emissions are reduced further by sandwiching ground traces along with power traces and connecting to.the heat sink with the shortest possible route. This reduces the ground loop area, which consequently reduces emissions.