Power conversion controller having a novel power factor correction mechanism using line voltage normalization

A power conversion controller having a novel power factor correction mechanism, comprising:

• a normalization unit, using an auto gain control mechanism to generate a normalized signal and a normalizing gain according to a line voltage, wherein said normalized signal is equal to a product of said line voltage and said normalizing gain, and said normalizing gain is proportional to a reciprocal of an amplitude of said line voltage,
• a reference current generation unit, coupled to said normalization unit to generate a reference current signal by performing an arithmetic operation, wherein said arithmetic operation involves said normalized signal wherein said reference current generation unit implements selecting said arithmetic operation from a group that includes both SREFC=VNORM×SG and SREFC=VNORM, wherein SREFC represents said reference current signal, VNORM represents said normalized signal, and SG represents said normalizing gain;
• and
• a gate drive signal generation unit, used to generate a gate drive signal, wherein a duty of said gate drive signal is determined by a voltage comparison of said reference current signal and a current sensing signal.