Patent ID: 9054597
Filing Date: 2015-06-09
Classification: H02M,Y02B,Y02P

Abstract:
1. A boost power factor correction (PFC) controller configured for an AC/DC converter, the boost PFC controller comprising: a) an off signal generator configured to compare an inductor current sample signal against a first control signal, wherein said inductor current sample signal increases during an on time of a power switch of said AC/DC converter, and wherein said off signal generator is configured to generate an off signal when said inductor current sample signal reaches a level of said first control signal; b) an on signal generator configured to compare a peak value of a second control signal having a first coefficient of proportionality to an off time of said power switch against a third control signal having a second coefficient of proportionality to an off duty cycle of said power switch, wherein said second control signal increases during said off time of said power switch, and wherein said on signal generator is configured to generate an on signal when said second control signal reaches a level of said third control signal; and c) a logic circuit coupled to said on signal generator and said off signal generator, wherein said logic circuit is configured to turn on said power switch when said on signal is active, and to turn off said power switch when said off signal is active, wherein each of said second and third control signals is generated using an output of said logic circuit that is used to control said power switch.