Pulsed width modulation method for power transforming apparatus

Details Pulsed width modulation method for power transforming apparatus Pulsed width modulation method for power transforming apparatus

1997-10-01

1998-12-22

Wong, Peter S.

Electric power conversion systems

Current conversion

With means to introduce or eliminate frequency components

363 34, 363 37, 363 98, 318722, H02J 102, H02J 300, H02M 545, H02P 146

Patent

active

058525513

ABSTRACT:
An improved pulse width modulation method for a power transforming apparatus which is capable of decreasing a switching efficiency loss by providing a phase having the maximum size of a phase current which is not switched. The method includes the steps of a first step for computing a phase voltage command in accordance with a phase of a voltage from the load circuit, a second step for performing a three-phase pulse width modulation with respect to the phase voltage command when the voltage and frequency applied to the load circuit are below a predetermined value, a third step for computing new phase voltage commands which have the same phase as the phase of a current when the voltage and frequency applied to the load circuit are above a predetermined value, and a fourth step for performing a pulse width modulation so that a switching operation having the maximum absolute value of the current among the new phase voltage commands obtained in the third step becomes idle.

REFERENCES:
patent: 3967173 (1976-06-01), Stich
patent: 5182463 (1993-01-01), Yamamoto et al.
patent: 5585708 (1996-12-01), Richardson et al.
patent: 5608301 (1997-03-01), Inaniwa et al.

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