公开(公告)号：US11990833B2

公开(公告)日：2024-05-21

申请号：US17917628

申请日：2020-07-13

Applicant: Mitsubishi Electric Corporation

Inventor： Yasuaki Furusho ,  Ryota Asakura ,  Ryosuke Kobayashi ,  Mamoru Kamikura

IPC: H02M1/12

CPC classification number: H02M1/126

Abstract: Provided is a low-cost noise filter having a noise suppression effect that is not reduced even when a resonance frequency changes according to changes in temperature. A noise filter includes: a noise detection unit which detects a common mode noise; a cancellation signal output unit; an injection unit which injects a cancellation signal; and a grounded capacitor. The cancellation signal output unit includes a filter part which generates the cancellation signal from the common mode noise, and an amplification part which amplifies the cancellation signal. A temperature dependence of a product of an inductance value and a capacitance value of a main circuit portion including the noise detection unit, the injection unit, and the grounded capacitor, and a temperature dependence of a product of an inductance value and a capacitance value of the filter part, are equal to each other.