US 12,114,409 B2
Energy metering and surge current detection
Johannes Adrianus Cornelis Misdom, Weert (NL)
Assigned to SIGNIFY HOLDING B.V., Eindhoven (NL)
Appl. No. 17/916,069
Filed by SIGNIFY HOLDING B.V., Eindhoven (NL)
PCT Filed Mar. 26, 2021, PCT No. PCT/EP2021/058042
§ 371(c)(1), (2) Date Sep. 30, 2022,
PCT Pub. No. WO2021/204569, PCT Pub. Date Oct. 14, 2021.
Claims priority of application No. 20169051 (EP), filed on Apr. 9, 2020.
Prior Publication US 2023/0156894 A1, May 18, 2023
Int. Cl. H05B 47/25 (2020.01); G01R 19/165 (2006.01); G01R 22/06 (2006.01); H02H 1/00 (2006.01)
CPC H05B 47/25 (2020.01) [G01R 19/16571 (2013.01); G01R 22/065 (2013.01); H02H 1/0007 (2013.01)] 14 Claims
OG exemplary drawing
 
1. A circuit for energy metering and surge current detection, comprising:
a current transformer having a primary winding and a secondary winding (L2, L3);
a first current sensing arrangement connected to the secondary winding, for energy metering; and
a second current sensing arrangement connected to the secondary winding, for surge current detection, wherein the second current sensing arrangement comprises a high pass filter, wherein the secondary winding comprises first and second winding portions in series, wherein a virtual earth is defined at the junction between the first and second winding portions, and the ends of the first and second winding portions opposite the junction each connect to a transformer output through a respective forward diode, and wherein the first and second current sensing arrangement are each connected to the transformer output and to the virtual earth.