Control apparatus for pulse width modulation inverters

Details Control apparatus for pulse width modulation inverters Control apparatus for pulse width modulation inverters

1987-01-13

1988-02-02

Salce, Patrick R.

Electric power conversion systems

Current conversion

With means to introduce or eliminate frequency components

363 95, 363135, 318811, H02M 7527

Patent

active

047232013

ABSTRACT:
In a PWM inverter, a first three pulse mode, in which three voltage pulses exist within 120.degree. in the electric angle of the inverter output voltage, is changed over to a single pulse mode, in which the pulse width is equal to 120.degree., through a second three pulse mode, which is composed of two voltage pulses on both sides outside the period of 120.degree. and a center voltage pulse therebetween.
The jump of the output voltage and the phase deviation therein upon changeover between the three pulse mode and the single pulse mode is prevented by controlling the pulse width of the two side pulses and the intervals between the center pulse and the side pulses.

REFERENCES:
patent: 3819992 (1974-06-01), Opal et al.
patent: 4615000 (1986-09-01), Fujii et al.
patent: 4636928 (1987-01-01), Deguchi et al.

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