Patent ID: 8665618

Claim:
A passive power factor correction circuit for a non-power factor corrected AC to DC power supply that receives 3-phase current from a connected 3-phase AC power source, said power supply having respective inputs associated with phase, said correction circuit comprising: a linear inductor having an inductance and, a capacitor having a capacitance, with said inductor having a winding arranged and adapted for electrical connection in series with said capacitor, a separate said passive power factor correction circuit connecting a respective phase of said connected 3-phase AC power source and its respective associated power supply input-with no other active semiconductor power nor control switching components in operative combination with each separate passive power factor correction circuit, said inductance in combination with said capacitance of values reducing odd harmonic frequency current components from the line current drawn by said power supply in response to a load being placed on said AC to DC power supply, said inductance in combination with said capacitance having values that set said resonant frequency within a range from between 0.91 and 0.94 of a lowest frequency of said 3-phase current; and wherein said power supply draws less the 10% harmonic current content in said 3-phase current while achieving a power factor value of about 0.98 at less than about 1% loss in line operating input voltage.