Control method and apparatus for a UFC for minimizing input current distortions
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United States of America Patent
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Apr 8, 1986
Grant Date -
N/A
app pub date -
Apr 3, 1984
filing date -
Apr 3, 1984
priority date (Note) -
Expired
status (Latency Note)
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Abstract
In a pulse-width modulated unrestricted frequency changer (UFC) the harmonic contents of the input current are minimized by splitting the active time intervals within the fundamental time frame into at least two pulses which are located within such time frame and controlled in width as if individual PWM single-pulse UFC's were controlled having a phase shift between each other so as to eliminate or reduce undesired frequency components. Such elimination or minimization of selected frequency components is used to reduce the size of the lowpass filter at the input of the UFC, namely by allowing a higher cut-off resonance limit.
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