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Patent Searching and Data


Title:
METHOD AND APPARATUS FOR CIRCUIT MONITORING
Document Type and Number:
WIPO Patent Application WO/2020/073198
Kind Code:
A1
Abstract:
A method for circuit monitoring includes detecting a waveform of first voltage at a DC-link capacitor in a power converter, the first voltage being generated by turning on a chopper circuit coupling in parallel to the DC-link (310); determining a phase angle shift of the waveform of first voltage with respect to a waveform of second voltage at a rectifier in the power converter or a power supply for the power converter (320); determining magnitude of the waveform of first voltage (330); and determining, based on at least one of the magnitude and the phase angle shift, a parameter indicative of a health condition of the DC-link capacitor (340). An apparatus is also provided.

Inventors:
MENG JINLEI (CN)
WANG BO (CN)
DENG HAITAO (CN)
Application Number:
PCT/CN2018/109502
Publication Date:
April 16, 2020
Filing Date:
October 09, 2018
Export Citation:
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Assignee:
ABB SCHWEIZ AG (CH)
MENG JINLEI (CN)
WANG BO (CN)
DENG HAITAO (CN)
International Classes:
H02M5/458
Foreign References:
US20130155729A12013-06-20
CN105785136A2016-07-20
CN101918852A2010-12-15
CN106464148A2017-02-22
CN103529315A2014-01-22
CN105830326A2016-08-03
CN108352779A2018-07-31
Other References:
See also references of EP 3864745A4
Attorney, Agent or Firm:
KING & WOOD MALLESONS (CN)
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