Patent ID: 7317625

Claim:
A method for controlling an AC-DC power supply converter with a Boost topology, the AC-DC power supply converter comprising a rectifier for converting an AC voltage to an input DC voltage, an inductor coupled to the input DC voltage, and a switch controlling an inductor current through the inductor to generate an output DC voltage across a load, the method comprising: (a) determining a first term in a first switching period at least based upon a voltage difference between a reference output voltage and the input DC voltage in the first switching period, and the reference output voltage; (b) determining a second term in the first switching period at least based upon a current difference between a predetermined reference input current for a second switching period subsequent to the first switching period and an actual inductor current of the inductor sampled in the first switching period, and the reference output voltage, the second term being determined in parallel with the first term; and c) determining a duty cycle of the switch for the first switching period by at least adding the first term determined in the first switching period to the second term determined in the first switching period.