US 12,463,612 B2
Pi-type noise filter disposed within a case and including first and second partitions with a gap therebetween that are interposed between stages of the filter
Jia Li, Tokyo (JP); Aya Tooyama, Tokyo (JP); and Hirofumi Shimizu, Hitachinaka (JP)
Assigned to HITACHI ASTEMO, LTD., Hitachinaka (JP)
Appl. No. 17/924,392
Filed by Hitachi Astemo, Ltd., Hitachinaka (JP)
PCT Filed Mar. 10, 2021, PCT No. PCT/JP2021/009695
§ 371(c)(1), (2) Date Nov. 10, 2022,
PCT Pub. No. WO2021/229908, PCT Pub. Date Nov. 18, 2021.
Claims priority of application No. 2020-083659 (JP), filed on May 12, 2020.
Prior Publication US 2023/0299734 A1, Sep. 21, 2023
Int. Cl. H03H 1/00 (2006.01); H02M 1/44 (2007.01); H02M 7/48 (2007.01); H03H 7/01 (2006.01); B60L 15/00 (2006.01); H02M 1/12 (2006.01)
CPC H03H 1/0007 (2013.01) [H02M 1/44 (2013.01); H02M 7/48 (2013.01); H03H 7/01 (2013.01); B60L 15/007 (2013.01); H02M 1/123 (2021.05); H02M 1/126 (2013.01)] 4 Claims
OG exemplary drawing
 
1. A filter device comprising:
a π-type noise filter; and
a metal case for eclosing the π-type noise filter therein, and in which a first ground point and a second ground point are formed;
wherein:
the π-type noise filter includes: a magnetic core configured to surround a direct current wiring including a positive electrode wiring and a negative electrode wiring; a first capacitor disposed in a stage preceding the magnetic core and connected to the direct current wiring; and a second capacitor disposed in a stage subsequent to the magnetic core and connected to the direct current wiring, each of the first capacitor and the second capacitor connected to a corresponding one of the first ground point and the second ground point,
a first partition and a second partition are interposed between the preceding stage and the subsequent stage of the π-type noise filter in the metal case, and
a first surface of the first partition opposes a first surface of the second partition across a predetermined gap, a second surface of the first partition opposes the first ground point, and a second surface of the second partition opposes the second ground point.