Apparatus for reducing apparent capacitance in high frequency filter for power line
AssigneeAnd Yet, Inc.
InventorMartin H. Graham
Life of this patent
Estimating the term…
Abstract
An Op amp circuit is used to provide higher capacitance to a power network to remove unwanted high frequency components from the power signal. At the primary power line frequency, a lower capacitance is presented by the circuit.
Claims15
A system for reducing high frequency components in an AC power network comprising:
- a 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.
A circuit having an input node for reducing high frequency components in an AC power network comprising:
- an operational amplifier (Op amp);
- an impedance, coupled between the input node and one input terminal of the Op amp;
- a first resistor coupled between an output of the Op amp and the input terminal;
- a capacitor coupled between the output of the Op amp and the input node;
- and
- wherein a ratio of the impedance over the first resistor is at least 10 at the frequencies of the high frequency components.
A method of reducing high frequency components in the range of 10 KHz to 400 KHz in a 50-60 Hz power network comprising:
- providing a circuit which includes a capacitor which circuit presents a substantially lower impedance to the high frequency components than the impedance presented to a 50-60 Hz power signal;
- and
- coupling the circuit to the power network.
A method of reducing high frequency components in the range of 10 KHz to 400 KHz in a 50-60 Hz power network comprising:
- presenting a first capacitance in the network at 50-60 Hz;
- and
- presenting a higher, second capacitance in the network to the higher frequency components.
Dependencies are inferred from the claim text.