公开(公告)号：US10447225B2

公开(公告)日：2019-10-15

申请号：US15794817

申请日：2017-10-26

Applicant: Huawei Technologies Co., Ltd.

Inventor： Changsheng Pei ,  Yongbing Gao ,  Heling Zhang

IPC: H03H1/00 ,  H03H7/42 ,  H02J3/01 ,  H02J3/24 ,  H03D3/08 ,  H02M1/12 ,  H02J3/18

Abstract: A filter apparatus, which includes a feedback active common-mode filter and a feed-forward active common-mode filter, the feedback active common-mode filter includes a common-mode noise detection component and a first filter circuit, and the feed-forward active common-mode filter includes the common-mode noise detection component and a second filter circuit, where the first filter circuit is connected between the common-mode noise detection component and the device, and performs feedback filtering on a first common-mode noise signal, to obtain a second common-mode noise signal; the common-mode noise detection component is connected between the first filter circuit and the second filter circuit, detects the second common-mode noise signal, and provides the second filter circuit with the second common-mode noise signal; and the second filter circuit is connected between an external power source and the common-mode noise detection component, and performs feed-forward filtering on the second common-mode noise signal.