Method and device for reducing the influence of a DC...

Details Method and device for reducing the influence of a DC... Method and device for reducing the influence of a DC...

2009-03-11

2011-10-04

Masih, Karen (Department: 2837)

Electricity: motive power systems

Phasing or angular or linear positional control of movable...

C318S812000, C318S772000

Reexamination Certificate

active

08030870

ABSTRACT:
A method for reducing the influence of a DC component in a load current of an asynchronous three-phase motor, in which the voltages of two of the three phases are controlled by adjusting firing angles of semiconductor devices of the type turning-off at zero-crossing of the current therethrough comprises the steps carried out for each said controlled phase: detecting turn-off times of the semiconductor devices, calculating a value of a change of firing angle of the semiconductor devices needed for changing the length of the time period between two subsequent turn-off times for compensating for the influence of a DC component, and determining the firing angle of said semiconductor devices in dependence of the result of this calculation.

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Supplementary Partial European Search Report; EP 07 79 4208; Sep. 9, 2009; 12 pages.
International Search Report, Dec. 14, 2007, 4 pages.

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