US 12,456,916 B2
Power filter
Zhongfeng Pan, Shanghai (CN); Chong Liu, Jiangsu (CN); Weijia Lu, Shanghai (CN); Lei Wang, Jiangsu (CN); Qingfeng Xia, Jiangsu (CN); Shangpeng Li, Jiangsu (CN); Qiang Zhou, Shanghai (CN); and Guangjun Qin, Shanghai (CN)
Assigned to HARMAN BECKER AUTOMOTIVE SYSTEMS GMBH, Karlsbad-Ittersbach (DE)
Filed by Harman Becker Automotive Systems GmbH, Karlsbad (DE)
Filed on Sep. 16, 2022, as Appl. No. 17/933,043.
Claims priority of application No. 202111091247.5 (CN), filed on Sep. 17, 2021.
Prior Publication US 2023/0089880 A1, Mar. 23, 2023
Int. Cl. H02M 1/32 (2007.01); H02M 1/44 (2007.01); H02M 3/155 (2006.01)
CPC H02M 1/32 (2013.01) [H02M 1/44 (2013.01); H02M 3/155 (2013.01)] 8 Claims
OG exemplary drawing
 
1. A power filter, comprising:
an overvoltage protection circuit, and
an LC filter circuit connected to the overvoltage protection circuit,
wherein the overvoltage protection circuit comprises a voltage regulator and a peak compensation circuit, and the peak compensation circuit is configured to generate a gain peak at a resonance frequency of the LC filter circuit, so as to compensate for a gain dip at the voltage regulator stage occurring at the resonance frequency of the LC filter circuit, wherein the peak compensation circuit comprises an equivalent inductance circuit and RC (resistor-capacitor) components connected in parallel, and wherein the RC components comprise a first resistor and a first capacitor connected in parallel, and the equivalent inductance circuit comprises an operational amplifier and a second resistor connected between a reverse input terminal and an output terminal of the operational amplifier.