US 12,294,348 B2
Single stage EMI filter design to meet EMI requirements
Karan Goel, Gurugram (IN); Chander Gupta, Gurugram (IN); Sujoy Mandal, Gurugram (IN); and Anand Kumar, Gurugram (IN)
Assigned to Ciena Corporation, Hanover, MD (US)
Filed by Ciena Corporation, Hanover, MD (US)
Filed on Apr. 6, 2023, as Appl. No. 18/296,581.
Claims priority of application No. 202211025522 (IN), filed on May 2, 2022.
Prior Publication US 2023/0361747 A1, Nov. 9, 2023
Int. Cl. H03H 7/01 (2006.01); H03H 7/42 (2006.01)
CPC H03H 7/427 (2013.01) [H03H 7/0115 (2013.01); H03H 7/0153 (2013.01)] 20 Claims
OG exemplary drawing
 
1. A single stage electromagnetic interference (EMI) filter circuit comprising:
a power source input configured to connect to a power source;
an equivalent common mode and differential mode filter including a single inductor having both common mode inductance for common mode filtering and specific parasitic inductance; and
a differential capacitance stage connected to the single inductor in parallel, wherein a combination of the specific parasitic inductance and capacitance of the differential capacitance stage are used to provide differential mode filtering.