Vermogenstoevoersysteem met een hoge vermogensfactor.

摘要

The present invention relates to a high power factor power supply system of high efficiency which is small in size and light in weight. The invention operates by setting the input power factor to 1 and by controlling a resonant converter. The power factor power supply system according to this invention includes: a full wave rectifying means for rectifying an alternating signal; a voltage dividing means for dividing a rectified signal; a capacitor connected in parallel to the voltage dividing means; an inductor connected to the full wave rectifying means; switching means for controlling a supply of current flowing in the inductor; a resonant circuit portion formed of the inductor and capacitor and connected to the switching means; an output circuit for receiving a signal of the resonant circuit portion, rectifying and then transmitting the signal to a load; and a controlling circuit for providing a switching controlling signal to the switching means. The controlling circuit includes a saw tooth wave signal generator, comparing means for comparing an output of the voltage dividing means with a signal of the saw tooth wave signal generator, and a frequency divider for generating a switching controlling signal having a zero area at each switching pulse according to an output of the comparing means.