Three-phase PWM inverter providing an improved output sinusoidal

Details Three-phase PWM inverter providing an improved output sinusoidal Three-phase PWM inverter providing an improved output sinusoidal

1991-07-19

1993-01-26

Stephan, Steven L.

Electric power conversion systems

Current conversion

With condition responsive means to control the output...

363 95, H02M 75387

Patent

active

051827018

ABSTRACT:
In an inverter in which six switching elements of an inverter main circuit is controlled to be turned on and off under a switching pattern in which a voltage space vector composed of adjacent two of six fundamental voltage vectors out of phase from one another by an electrical angle of .pi./3 and a zero vector figures a circular locus so that a three-phase substantially sinusoidal voltage is obtained, a three-phase PWM signal generating device includes a circuit in which two switching patterns of the same kind are formed before and after the formation of the switching pattern corresponding to the zero vector, respectively, a circuit in which the switching pattern corresponding to the zero vector is held for half of its holding time when the voltage space vector passes an intermediate phase position between the two adjacent fundamental voltage vectors, and a circuit in which when the magnitude of the command voltage vector exceeds the region of a circular locus figured by the fundamental voltage vector, the command voltage vector is converted to a new command voltage vector so as to meet the region.

REFERENCES:
patent: 4720777 (1988-01-01), Yokoi
patent: 4722042 (1988-01-01), Asano et al.
patent: 4800478 (1989-01-01), Takahashi
patent: 4847743 (1989-07-01), Kamiyama
patent: 4924373 (1990-05-01), Inaba et al.
patent: 4994950 (1991-02-01), Gritter
patent: 4994956 (1991-02-01), Kirchberg et al.
patent: 5001619 (1991-03-01), Nakajima et al.

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