Electric power conversion apparatus

Details Electric power conversion apparatus Electric power conversion apparatus

1997-11-19

1999-09-28

Nguyen, Matthew

Electric power conversion systems

Phase conversion without intermediate conversion to d.c.

With automatic voltage magnitude or phase angle control

H02M 500

Patent

active

059598581

ABSTRACT:
A sine wave input converter provided with a phase sequence computation unit which inputs two line voltages or two phase voltages of the three phase ac power supply, computes the phase of a sine wave voltage of one of these two inputs, and determines on the basis of computation using these two input voltages and the phase whether the phase sequence is positive or antiphase, which is determined depending on whether the result of computation assumes a constant value, or becomes a sine wave oscillating between positive and negative values. Power supply interruption can be determined from the same computation result.

REFERENCES:
patent: 4021704 (1977-05-01), Norbeck
patent: 4443747 (1984-04-01), Chausse et al.
patent: 4490780 (1984-12-01), Nondahl
patent: 5103152 (1992-04-01), Tsurumaki
patent: 5621296 (1997-04-01), Werner et al.

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