AC to DC conversion system with current spreading circuit

Electric power conversion systems – Current conversion – Including d.c.-a.c.-d.c. converter

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363 37, 363 48, 363 70, H02P 1324

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active

045232660

ABSTRACT:
A power supply circuit having a higher power factor and decreased current crest factor. The circuit preferably comprises 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-modulation circuit intercouples between the input and output circuits and includes a controlled circuit adapted to pass input AC current in pulse-wide 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 including an OR circuit at the output to provide the necessary combining.

REFERENCES:
patent: 4319317 (1982-03-01), Fukui et al.
patent: 4330816 (1982-05-01), Imazeki et al.
Goyal et al., "Miniturization of Thyristorized Power Supplies Using Pulse Width Modulation Techniques", Journal of the Institution of Electronics and Telecommunication Engineers, vol. 22, No. 6, pp. 402-405, Jun. 1976, (India).
Williams, "Exploit D/A Converters in Unusual Controller Design", EDN, pp. 111-116, Nov. 25, 1981.

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