US 11,990,833 B2
Noise filter
Yasuaki Furusho, Tokyo (JP); Ryota Asakura, Tokyo (JP); Ryosuke Kobayashi, Tokyo (JP); and Mamoru Kamikura, Tokyo (JP)
Assigned to MITSUBISHI ELECTRIC CORPORATION, Tokyo (JP)
Appl. No. 17/917,628
Filed by Mitsubishi Electric Corporation, Tokyo (JP)
PCT Filed Jul. 13, 2020, PCT No. PCT/JP2020/027197
§ 371(c)(1), (2) Date Oct. 7, 2022,
PCT Pub. No. WO2022/013905, PCT Pub. Date Jan. 20, 2022.
Prior Publication US 2023/0179085 A1, Jun. 8, 2023
Int. Cl. H02M 1/12 (2006.01)
CPC H02M 1/126 (2013.01) 10 Claims
OG exemplary drawing
 
1. A noise filter comprising:
a noise detector which detects a common mode noise on an electrical path;
a cancellation signal output circuitry which generates a cancellation signal from the detected common mode noise and outputs the cancellation signal;
an injector which injects the cancellation signal into the electrical path; and
a grounded capacitor connected to the electrical path, wherein
the cancellation signal output circuitry includes
a filter part which generates the cancellation signal by filtering the detected common mode noise, and
an amplification part which amplifies the cancellation signal, and
a temperature dependence of a product of an inductance value and a capacitance value of a main circuit portion including the noise detector, the injector, 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.