| 摘要 |
A Low Cost High Performances Power Factor Correction method, system and apparatus, comprising a AC power source (Vac) able to provide a low frequency supply signal, a low frequency pass filter circuit (LPF) able to protect the power source (Vac) against reverse high frequency signal noise, a rectifier circuit (BR) able to provide a fully rectify low frequency supply signal, a high frequency DC/DC converter circuit (PFC-LSC) able to convert the fully rectified low frequency supply signal into a rectified high frequency supply signal and having the capability to absorb and deliver at any moment a current amount contingent and linearly proportional in amplitude to its supply voltage amount and/or its driving pulses duty cycle ratio, a small signal controller circuit (PFC-SSC) able to control the converter circuit and a complex load circuit (CL) including at least one capacitor able to storage the rectified high frequency supply signal, so the small signal controller circuit (PFC-SSC) controls the large signal converter circuit (PFC-LSC) by means of a pulse width modulation driving signal consisting of trains of pulses constant in frequency and duty cycle during a period of time equal or longer than one of the AC power source (Vac) supply signal semi-cycle period so during each the supply signal's semi-cycle period, as long as the controlling pulse is constant, the current amount absorbed by the large signal circuit (PFC-LSC) from the AC power source (Vac) is contingent and linearly proportional to the AC power source's voltage amount only, so the AC power source's output current and voltage amount follows an identical graphic shape and so the energy transfer's power factor parameter of the AC power source (Vac) and the complex load (CL) system is improved near unity.
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