US 12,438,440 B2
Noise reduction circuit, power conversion device, and refrigeration apparatus
Kodai Okuzono, Osaka (JP); Yoshitsugu Koyama, Osaka (JP); Masaki Kono, Osaka (JP); Hirotaka Doi, Osaka (JP); and Reiji Kawashima, Osaka (JP)
Assigned to DAIKIN INDUSTRIES, LTD., Osaka (JP)
Filed by DAIKIN INDUSTRIES, LTD., Osaka (JP)
Filed on Mar. 29, 2024, as Appl. No. 18/621,289.
Application 18/621,289 is a continuation of application No. PCT/JP2022/036641, filed on Sep. 30, 2022.
Claims priority of application No. 2021-162110 (JP), filed on Sep. 30, 2021.
Prior Publication US 2024/0243730 A1, Jul. 18, 2024
Int. Cl. H02M 1/12 (2006.01); H02M 1/44 (2007.01); H02M 5/42 (2006.01); H03H 11/04 (2006.01)
CPC H02M 1/123 (2021.05) [H02M 1/44 (2013.01); H02M 5/42 (2013.01); H03H 11/04 (2013.01)] 14 Claims
OG exemplary drawing
 
1. A noise reduction circuit comprising:
noise canceler circuitry configured to inject a compensation current into a power line and ground to reduce a common mode noise current that flows through the power line and the ground into a commercial power supply from a power converter with a switching element connected to the commercial power supply; and
overcurrent inhibitor circuitry provided on a compensation current path through which the compensation current flows, the overcurrent inhibitor circuitry being configured to inhibit application of an overcurrent to the noise canceler circuitry.