Interlaced pulse-width modulated unrestricted frequency...

H - Electricity – 02 – M

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318/120, 321/7

H02M 5/257 (2006.01) H02M 5/27 (2006.01) H02P 27/16 (2006.01)

Patent

CA 1231755

36 ABSTRACT OF THE DISCLOSURE In a static frequency changer controlled by adjusting the time of conduction of the bilateral switching units forming static converters, the time of conduction is split into n time intervals of respective subdurations adding up to be equivalent to the effective time of con- duction of the controlled switching unit, and such sub- durations are spread and distributed throughout the time period of control of the switching unit both within the original switching pattern of each converter and between the effective times of conduction of the respective con- verters, thereby to minimize harmonic distortion of the input supply current of the frequency changer.

478094

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