Digitally controlled power supply with high power factor

Details Digitally controlled power supply with high power factor Digitally controlled power supply with high power factor

H - Electricity

02

P

323/4, 321/83

H02P 13/24 (1980.01)

Patent

CA 1171906

DIGITALLY CONTROLLED POWER SUPPLY Abstract of the Disclosure A high power factor AC to DC power supply having a high frequency pulse producing circuit comprising an in- ductor supplied with rectified raw AC power through a semiconductor switch which provides dynamic power factor correction by maintaining the width of the on-times of the switch substantially constant throughout each cycle of the input AC power. The peak energy stored in the in- ductor during the on-times are a function of the ampli- tude of the instantaneous voltage of said rectified AC power, so that each time the switch is turned off, the output pulse of current supplied to the load by the in- ductor has a time duration which is a direct function of the instantaneous voltage value of the rectified AC power. The output load has a filter whose time constant is greater than a cycle of said rectified AC power, and the average on-time of said switch is varied over a num- ber of cycles of said AC power to regulate the output voltage of said supply.

373812

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