Power-factor correction in bridge and voltage-doubler rectifier circuits with inductors and capacitors

To improve the power factor and to comply with line-harmonics regulations, a power-factor-correction/line-harmonics-reduction circuit must be added to the capacitively filtered bridge or voltage-doubler rectifier. Passive solutions (i.e. circuits using only inductors and capacitors) are simple, reliable, and generate no EMI. In this paper we discuss single-phase rectifier circuits employing an additional inductor and one or more additional capacitors for power-factor correction