Patent ID: 8564991

Claim:
A method of controlling a power factor correction (PFC) converter that has a discontinuous input current, the method comprising: sensing the discontinuous input current; sensing an output voltage from the converter; and controlling a duty cycle of at least one switch in the converter in response to the sensed input current and output voltage according to a predetermined control equation such that an average input current to the converter is substantially sinusoidal, wherein the predetermined control equation is M ⁡ ( D ) · 1 T s ⁢ ∫ 0 D ⁡ ( k ) · Ts ⁢ i ⁡ ( t ) ⁢ ⅆ t · R s = V m , where M(D) is a ratio of the output voltage to an input voltage, D(k) is the duty cycle in a k th switching cycle, i(t) is an inductor current in the k th switching cycle, T s is switching period, R s is an input current sense resistance, and V m is an amplified error voltage.