Patent ID: 6191565
Filing Date: 2001-02-20
Classification: G05F,H02M,Y02B,Y02P

Abstract:
A power factor compensation controller for use in a switching power supply having a switch, an inductor, and upper and lower reference signals that are proportional to an input voltage to the switching power supply, the power factor compensation controller comprising:a multiplier that multiplies an error signal and a signal representative of a current in the switch to produce a multiplier output signal;an adder that adds the multiplier output signal to the lower reference signal to produce an adder output signal;a comparator that compares the adder output signal to the upper reference signal to produce a comparator output signal;a flip-flop that receives the comparator output signal and a clocking signal; anda logic gate that receives an output of the flip-flop and the clocking signal to produce a gating signal for controlling the conduction of the switch so that an envelope of peak currents in the switch is substantially in-phase with the input voltage.