Patent ID: 8368248

Claim:
An apparatus for reducing conducted emissions on a power line, the power line providing power to load on a load line, comprising: an active current filter connected to the power line and configured to monitor current in the power line or the load line to sense current fluctuations on the power line or the load line, the active current filter generating a corrective signal in response to the sensed current fluctuations and providing the corrective signal to the power line and the load line, the corrective signal causing current to be absorbed from the power line or fed to the load line as needed to reduce current fluctuations in the power line having frequencies above a predefined cutoff frequency; and an auxiliary power source within the active current filter, the auxiliary power source providing a predefined DC voltage to the active current filter and configured to operate as a current reservoir for the active current filter to source current to the load line and sink current from the power line; wherein the active current filter is further configured to monitor the predefined DC voltage of the auxiliary power source and to source current to the load line or sink current from the power line as needed to maintain the predefined DC voltage within a predefined voltage range without affecting the reduction of the current fluctuations.