approximate unity power factor (UPF) control
unity power factor control
unity power factor load
unity power factor operation
Unity Power Factor Rectifier
unity power factor(UPF)control
unity power-factor rectification
3-phase power factor correction
Active Power Factor Correction
active power factor correction APFC
Active power factor corrector
Active power factor corrector with high frequency switch
Adjustable Power Factor
adjustment of power factor angle φ