Title:
NOISE REDUCTION CIRCUIT, LOAD SYSTEM, POWER CONVERSION DEVICE, AND REFRIGERATING APPARATUS
Document Type and Number:
Japanese Patent JP2023051880
Kind Code:
A
Abstract:
To provide a noise reduction circuit.SOLUTION: A noise reduction circuit 30a comprises: noise cancelers 34a to 36a that reduce a common mode noise current flowing via a power line and an earth from a power converter 20 connected to an AC power supply 100 with a compensation current; and a DC power supply unit 33a for the noise cancelers. A voltage Vcc of a DC power supply V of the DC power supply part is less than 2/3 of a DC link voltage of the power converter. The voltage Vcc is set to a maximum value of V or √2 times or more of an actual value of V, when a connection point of a path (a coupling capacitor part 32a) connecting the power line with the ground and the power line is a first connection point, a connection point of the path and the ground is a second connection point, the common node noise current of the power line on the AC power supply side of the first connection point is Ig, the compensation current is Io, a path impedance is Z1, and the impedance on the AC power supply side of the first and second connection points is Z2 and V=2*(Z1*Io-Z2*Ig).SELECTED DRAWING: Figure 1
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Inventors:
OKUZONO KOTA
KOYAMA YOSHITSUGU
KONO MASAKI
DOI HIROYOSHI
KAWASHIMA REIJI
KOYAMA YOSHITSUGU
KONO MASAKI
DOI HIROYOSHI
KAWASHIMA REIJI
Application Number:
JP2022157967A
Publication Date:
April 11, 2023
Filing Date:
September 30, 2022
Export Citation:
Assignee:
DAIKIN IND LTD
International Classes:
H02M1/12; F25B49/02; H02M7/48; H03H7/09
Domestic Patent References:
| JP2004534500A | 2004-11-11 | |||
| JP2006333647A | 2006-12-07 | |||
| JP2017038500A | 2017-02-16 | |||
| JP2002252985A | 2002-09-06 |
Attorney, Agent or Firm:
Jiro Furube
Shintaro Kishi
Hiroyuki Kubo
Shintaro Kishi
Hiroyuki Kubo