Abstract
An active input filter for a power factor correction (PFC) circuit employing ripple current cancellation is proposed to reduce the filter's size and cost. Switching ripple current can be filtered by an active circuit from the line current. Using a single stage passive filter with an active filter compensation circuit, a high filter can be synthesized to meet the electromagnetic interference (EMI) and power factor requirements. Analysis of the active filter and its design procedure are detailed. Simulation results are presented to verify the high order filter characteristics of the proposed scheme.
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