Patent ID: 8736190

Claim:
A single stage, primary side, Power Factor Correction (PFC) driver circuit, the circuit comprising: a rectifier circuit configured to rectify an alternating input voltage; an inductor coupled in series with the rectifier circuit; a diode coupled in series with the inductor and an output load; a switch coupled to the inductor; a switch control circuit coupled to the switch and configured for: generating a first signal for commanding the switch to allow the inductor to transfer energy provided by a rectified input voltage to the output load, the first signal having a first frequency with a duty cycle in proportion to an amplitude of the rectified input voltage; generating a second signal for commanding the switch, the second signal having a second frequency that is higher than the first frequency; and commanding the switch with the second signal based on the first signal, the commanding causing a substantial constant pulse current to be provided to the output load.