Current estimator for a three phase invertor with PWM period adj

Details Current estimator for a three phase invertor with PWM period adj Current estimator for a three phase invertor with PWM period adj

Filed on

1997-07-30

Date issued

2000-04-11

Examiner

Hecker, Stuart N.

Patent Class

Electric power conversion systems

SubClass

Current conversion

SubSubClass

With condition responsive means to control the output...

Other Related Categories

363132, H02M 324, H02M 744

Type

Patent

Status

active

Patent number

060494743

Description

ABSTRACT:
Method of control of a three-phase or multi-three-phase invertor (1) supplied from a DC voltage source (2) and controlled by a processor (5) for deriving, in the course of successive slaving periods, signals for pulse-width-modulation control of the transistors of the invertor. It consists, from measuring the power supply current of the invertor and from taking account of the switching states of the transistors, in reconstituting the phase currents. When, within a PWM period, a time interval (u1, u2) between the instant of switching of a transistor of one phase and the instant of switching of a corresponding transistor of a following phase becomes less than a predetermined threshold value, preventing the measurement, a PWM is generated defining a measurement time interval, of sufficient duration to allow measurement of the effects of the switching on the line current, and the duration of the other PWMs of the same slaving period is reduced, by a value such that the sum of the reductions of these other PWMs compensates for the increase in the PWM defining the measurement interval.

REFERENCES:
patent: 4788485 (1988-11-01), Kawagishi et al.
patent: 4870556 (1989-09-01), Inaba et al.
patent: 5163172 (1992-11-01), Hakala
patent: 5309349 (1994-05-01), Kwan
patent: 5449990 (1995-09-01), Bowling et al.
patent: 5729449 (1998-03-01), Takada et al.
patent: 5757636 (1998-05-01), Fletcher

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