Power factor correction method and device

A power factor controller, applied to a boost-type converter, comprising:

• a voltage circuit, which receives an output voltage of said boost-type converter and a voltage command to output a duty phase;
• a reference switching signal generator, which receives an input voltage of said boost-type converter to produce a reference switching signal;
• a phase shifter, which receives said duty phase and said reference switching signal to produce a switching control signal;
• a triangle wave generator, which generates a triangle waveform signal;
• and
• a comparator, which compares said switching control signal with said triangle waveform signal to produce a switching signal.

A power factor controller, applied to a boost-type converter, comprising:

• a voltage circuit, which receives an output voltage of said boost-type converter and a voltage command to output a duty phase;
• a reference switching signal generator, which receives an input voltage and said output voltage of said boost-type converter to produce a reference signal and a switching signal amplitude;
• a phase shifter, which receives said duty phase and said reference signal to produce a phase-dependent signal;
• a multiplier, which receives said phase-dependent signal and said switching signal amplitude to produce a switching control signal;
• a triangle wave generator, which generates a triangle waveform signal;
• and
• a comparator, which compares said switching control signal with said triangle waveform signal to produce a switching signal.