Method and apparatus for controlling PWM inverter

Details Method and apparatus for controlling PWM inverter Method and apparatus for controlling PWM inverter

1985-08-19

1986-12-16

Evans, Arthur G.

Electricity: motive power systems

Induction motor systems

318802, H02P 742

Patent

active

046299599

ABSTRACT:
An induction motor is driven by a PWM inverter including switching elements such as gate turn-off thyristors of Graetz connection. Turn-on of the PWM inverter is controlled by PWM pulse signals generated from a pulse width modulator. The pulse width modulator includes comparators having a hysteresis characteristic which generate the PWM pulse signals on the basis of the magnitude and polarity of current errors between current command pattern signals and signals indicative of detected output currents of the PWM inverter. A signal generator generates an AC signal which is applied to the comparators so that the PWM pulse signals generated from the comparators act to increase the effective value of the neutral voltage of the output of the PWM inverter.

REFERENCES:
patent: 4227138 (1980-10-01), Espelage et al.
patent: 4230974 (1980-10-01), Espelage et al.
patent: 4314190 (1982-02-01), Walker et al.
patent: 4314191 (1982-02-01), Kawada et al.
patent: 4320331 (1982-03-01), Plunkett
patent: 4376894 (1983-03-01), Vogler

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