Electric power conversion systems – Current conversion – With means to introduce or eliminate frequency components
Patent
1989-02-02
1992-07-21
Beha, Jr., William H.
Electric power conversion systems
Current conversion
With means to introduce or eliminate frequency components
363 43, 363 72, H02M 7521, H02M 75387
Patent
active
051328925
ABSTRACT:
Disclosed is a controller which controls the a.c. (alternating current) on the basis of pulse-width modulation (PWM) for a multiple inverter which transforms d.c. power into high-voltage, high-capacity a.c. power with variable voltage and/or variable frequency. Several 3-phase inverter circuits connected through a transformer are used to form a polyphase mulitple inverter which produces the output voltage and current with synthesized voltage and current waveforms. The PWM controller produces multiple pulse trains within a half cycle of the a.c. output waveform and varies the equivalent voltage of pulses in a sinusoidal waveform, thereby obtaining a smooth output voltage and current waveforms. A plurality of 3-phase inverter main circuits connected to the d.c. power source have semiconductor switches, which are turned on or off integrally in PWM control mode in response to the on-off pulse signals provided by a single integral PWM signal generator, so that the instantaneous voltage variation is relatively small in the entire inverter output voltage range and the number of switching operations for the semiconductor switches is made minimal.
REFERENCES:
patent: 3638094 (1972-01-01), Ve Nard
patent: 4063143 (1977-12-01), Forstbauer
patent: 4167775 (1979-09-01), Baker et al.
patent: 4447786 (1984-05-01), Saar et al.
Institute of Electrical Engineers of Japan, "Technical Trend of Self Turn-Off Devices Application in Power Converting Facilities", Jan. 1984, p. 52.
Beha Jr. William H.
Mitsubishi Denki & Kabushiki Kaisha
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