Method of detecting phase-loss state of three-phase power...

Details Method of detecting phase-loss state of three-phase power... Method of detecting phase-loss state of three-phase power...

2008-04-08

2008-04-08

Nguyen, Matthew V. (Department: 2838)

Electric power conversion systems

Current conversion

Including automatic or integral protection means

C361S085000

Reexamination Certificate

active

11196245

ABSTRACT:
The disclosure relates to a method of detecting the phase-loss state of the three-phase power supply. When the phase-loss condition occurs in the input three-phase power supply of the power converter, it is determined whether the three-phase power source is in the phase-loss state through the characteristic of the frequency and amplitude variations of the ripple voltage of the DC bus, and through the sampling and the continuous detecting of the ripple voltage variations by making use of the sensor of the power converter in cooperation with the software calculation, it is determined whether the three-phase power source is in a phase-loss state. When the detected ripple voltage of the DC bus fulfills the phase-loss conditions, it is determined that the three-phase power source is in a phase-loss state.

REFERENCES:
patent: 4159514 (1979-06-01), Kakalec
patent: 4823226 (1989-04-01), Reed et al.
patent: 5570258 (1996-10-01), Manning
patent: 5665256 (1997-09-01), Toth

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