Current spreading circuit

H - Electricity – 02 – M

Patent

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321/83

H02M 7/155 (2006.01) H02M 3/28 (2006.01) H02M 3/33 (2006.01) H02M 3/337 (2006.01)

Patent

CA 1216022

ABSTRACT OF THE DISCLOSURE A current spreading circuit which in a pre- ferred embodiment is constructed as a power supply circuit having higher power factor and decreased current crest factor. The circuit preferably com- prises an input circuit for receiving an input AC voltage and rectifying this voltage and an output circuit for providing a DC output voltage. A pulse- width-modulator intercouples between the input and output circuits and includes a portion which is adapted to pass input AC current in pulse-width increments with the pulse-width varying in inverse proportion to the AC voltage. In this manner, when the instantaneous AC voltage is low, the pulse widths are wider and conversely when the voltage is high, the pulse widths are narrower. In one version of the invention, the pulse width modulation is carried out by a programmed variable ratio transformer. In one preferred embodiment of the present invention, the current spreading circuit is of a quasi cosecant type while in another preferred embodiment of the invention, there is a combination of pulse-width- modulation with a typical input filter circuit includ- ing an OR circuit at the output to provide the neces- sary combining.

446875

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