Electric power conversion systems – Frequency conversion without intermediate conversion to d.c. – By semiconductor converter
Patent
1984-04-03
1986-04-08
Beha, Jr., William H.
Electric power conversion systems
Frequency conversion without intermediate conversion to d.c.
By semiconductor converter
318810, 363165, H02M 5257
Patent
active
045816964
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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patent: 4488216 (1984-12-01), Gyugyi et al.
Gyugyi et al., "Static Power Frequency Changers", pp. 5-14 and 363-383, John Wiley & Son, 1976.
Cho Gyu-Hyeong
Gyugyi Laszlo
Heinrich Theodore M.
Beha Jr. William H.
Lorin C. M.
Sterrett Jeffrey
Westinghouse Electric Corp.
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