Electric power conversion systems – Current conversion – With means to introduce or eliminate frequency components
Patent
1988-02-26
1989-02-21
Beha, Jr., William H.
Electric power conversion systems
Current conversion
With means to introduce or eliminate frequency components
318811, H02M 75387
Patent
active
048071030
ABSTRACT:
An apparatus for controlling a PWM controlled inverter adapted to effect the waveform control of the inverter output voltage in accordance with the memory content of ROM in which instantaneous output voltage data are memorized. This control apparatus comprises a ROM in which the instantaneous output voltage outputs thereof in the PWM control are memorized, and in which the number of addresses within a predetermined electrical angle section is set to a fixed value irrespective of the number of switching times within the electrical angle section, an electrical angle counter in which duration corresponding to the duration time data read from the ROM is set, an address counter responding to the count-up of the electrical angle counter to advance the read address of the ROM, and a controller for controlling the output voltage of the inverter in accordance with an instantaneous output voltage corresponding to the instantaneous output voltage data read from the ROM.
REFERENCES:
patent: 4099109 (1978-07-01), Abbondanti
patent: 4410937 (1983-10-01), Uesugi
patent: 4513362 (1985-04-01), Aizawa
patent: 4698744 (1987-10-01), Itani et al.
patent: 4727468 (1988-02-01), Maekana
Beha Jr. William H.
Foley & Lardner Schwartz, Jeffery, Schwaab, Mack, Blumenthal & Evans
Kabushiki Kaisha Toshiba
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