Electric power conversion systems – Current conversion – Including an a.c.-d.c.-a.c. converter
Patent
1990-04-20
1991-11-12
Wong, Peter S.
Electric power conversion systems
Current conversion
Including an a.c.-d.c.-a.c. converter
363 39, 363 65, H02M 542
Patent
active
050653024
ABSTRACT:
In an adjustable a.c. power supply for an air-conditioner system, comprising a first frequency converter for driving a compressor motor of a first air-conditioner, a second frequency converter for driving a compressor motor of a second air-conditioner, and a common a.c. power supply for delivering a.c. power to both frequency converters, a rectifier included in at least one frequency converter is constructed as a controllable rectifier and subjected to phase-control so that a synthetic higher harmonic current of the two frequency converters as viewed from the a.c. power supply is reduced. By conducting phase-control of plural controllable rectifiers in a manner that, e.g., one rectifier has a phase-control angle of zero degrees and the other rectifier has a phase-control angle of 30 degrees, load current from the a.c. power supply is permitted to have a waveform closer to a sine wave, i.e., a waveform in which higher harmonic components are further reduced.
REFERENCES:
patent: 4814964 (1989-03-01), Schauder et al.
patent: 4849870 (1989-07-01), Heinrich
patent: 4849950 (1989-07-01), Sugiura et al.
Mitsubishi Denki K.K., "Inverter Application Manual", Nov. 20, 1988, pp. 268-269.
Kabushiki Kaisha Toshiba
Wong Peter S.
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