Patent ID: 8576022

Claim:
A method of tuning a programmable power line filter, the power line filter comprising: a live line, a neutral line, and a ground line connected to input terminals of the filter on an input side of the filter, the live line and the neutral line connected through inductors in the filter to output terminals on an output side of the filter; at least one inductor disposed in the live line between the input terminals and the output terminals, this at least one inductor characterized by an input side and an output side; at least one inductor disposed in the neutral line between the input terminals and the output terminals, this at least one inductor also characterized by an input side and an output side; a plurality of X-capacitors selectably connected through a first tuning switch between the live line and the neutral line on the input side of the inductors; a plurality of X-capacitors selectably connected through a second tuning switch between the live line and the neutral line on the output side of the inductors; a plurality of Y-capacitors selectably connected through a third tuning switch between the live line and ground on the output side of the inductors; a plurality of Y-capacitors selectably connected through a fourth tuning switch between the neutral line and ground on the output side of the inductors; and a tuning control circuit connected to the tuning switches and selectably connected through one or more programming switches to a load; the method comprising: measuring by the tuning control circuit an input impedance of the load; and programming by the tuning control circuit the tuning switches in dependence upon the input impedance of the load.