US 11,754,611 B2
Electromagnetic interference suppression circuit and related sensing circuit
Franki Ngai Kit Poon, Shatin (HK); and Peter On Bon Chan, Shatin (HK)
Assigned to AnApp Technologies Limited, Kowloon (HK)
Appl. No. 17/275,598
Filed by AnApp Technologies Limited, Kowloon (HK)
PCT Filed Jul. 21, 2020, PCT No. PCT/CN2020/103351
§ 371(c)(1), (2) Date Mar. 11, 2021,
PCT Pub. No. WO2022/016395, PCT Pub. Date Jan. 27, 2022.
Prior Publication US 2022/0026480 A1, Jan. 27, 2022
Int. Cl. G01R 31/00 (2006.01)
CPC G01R 31/002 (2013.01) 16 Claims
OG exemplary drawing
1. A sensing circuit for an electromagnetic interference suppression circuit, comprising:
an input adapted to be connected on a power line and in series between a load and a shunt circuit connected across power lines between a power source and the load; and
an output operatively coupled with the input, and adapted to provide a signal (Vs) associated with an electromagnetic interference signal (Vn) generated by or at the load and arranged to be experienced by the shunt circuit for determining a suppression signal (Vn′) for reducing, or substantially eliminating, the electromagnetic interference signal (Vn);
wherein the sensing circuit comprises:
a resonator circuit; and
a transformer connected in parallel with the resonator circuit;
wherein one of the transformer and the resonator circuit provides the input and the other one of the transformer and the resonator circuit provides the output.