Patent ID: 7560982
Filing Date: 2009-07-14
Classification: H03H

Abstract:
1. A system for reducing high frequency components in an AC power network comprising: a circuit, having an operational amplifier (OP amp) in an inverting configuration, a first resistor and a first capacitor coupled to a negative input terminal of the OP amp, a second resistor coupled to provide feedback to the negative input terminal, and a second capacitor coupled to an output of the OP amp, the circuit for providing a first capacitance at a primary frequency of the AC power network and a second, higher capacitance, in a frequency band, substantially higher than the primary frequency; and coupling for connecting the circuit to the power network, wherein the primary frequency of the AC power network is between 50-60 Hz, the ratio of the second resistor over the first resistor is at least 10, and the second capacitance has at least 10 times the capacitance of the first capacitance.