Title:
HARMONIC SUPPRESSION DEVICE AND AIR CONDITIONING SYSTEM
Document Type and Number:
WIPO Patent Application WO/2021/240642
Kind Code:
A1
Abstract:
A harmonic suppression device comprises: a rectifier in which a plurality of vertical arms are connected in parallel, an upper-side switching element and a lower-side switching element being connected in series in each vertical arm, and the phases of an AC power source being connected at a center point that is the connection point between the upper-side switching element and the lower-side switching element; a load current detection unit that detects the load current inputted to a harmonic generation load from the AC power source; a first and second drive circuit that turn the upper-side switching element and the lower-side switching element on and off; and a control device that generates a control signal for causing the first and second drive circuits to turn the upper-side switching element and the lower-side switching element on and off, the control device selecting, from among the load currents of the phases of the AC power source, the phase for which the load current is smallest as a charging phase, and turning the lower-side switching element corresponding to the charging phase in the second drive circuit on and off, whereby the bootstrap capacitor of the first drive circuit corresponding to the charging phase is charged.
Inventors:
ISHIKURA KEISUKE (JP)
HASHIMOTO AKINORI (JP)
ISHIKAWA SHUTA (JP)
HASHIMOTO AKINORI (JP)
ISHIKAWA SHUTA (JP)
Application Number:
PCT/JP2020/020731
Publication Date:
December 02, 2021
Filing Date:
May 26, 2020
Export Citation:
Assignee:
MITSUBISHI ELECTRIC CORP (JP)
International Classes:
H02M7/12; H02M1/08
Foreign References:
| JP2012050177A | 2012-03-08 | |||
| KR20190090542A | 2019-08-02 | |||
| JPH1175363A | 1999-03-16 | |||
| JP2016158432A | 2016-09-01 |
Attorney, Agent or Firm:
KISA PATENT & TRADEMARK FIRM (JP)
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