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US 7,589,605 B2Granted
Method and apparatus to provide compensation for parasitic inductance of multiple capacitors
AssigneeMassachusetts Institute of Technology
InventorsDavid J. Perreault, Brandon J. Pierquet
Life of this patent
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Abstract
A coupled winding cancels parasitic inductance of first and second capacitors. In an EMI filter having common mode capacitors and a differential capacitors, first and second windings cancel parasitic inductance of the common mode and differential capacitors.
Claims20
A filter comprising:
- first and second capacitors;
- and
- a circuit coupled to the first and second capacitors, the circuit including a discrete magnetically-coupled winding to compensate for equivalent series inductance effects of a first capacitor electrical path including the first capacitor and a second capacitor electrical path including the second capacitor,
- wherein the first capacitor is connected to the discrete magnetically coupled winding at a first connection point and the second capacitor is connected to the discrete magnetically-coupled winding at a second connection point,
- wherein induction of the magnetically-coupled winding generates voltages that counteract voltages due to equivalent series inductance of the first and second capacitor electrical paths and do not counteract voltages due to capacitances of the first and second capacitors.
2 more elements
A method of suppressing electrical signals, comprising:
- coupling a first capacitor having at least first and second ends to a circuit including a discrete magnetically-coupled winding at a first connection point;
- and coupling a second capacitor having at least first and second ends to the coupled magnetic winding circuit at a second connection point, wherein the discrete magnetically-coupled winding compensates for an effect of an equivalent series inductance of paths through the first and second capacitors, wherein an effect of the capacitances of the first and second capacitors is not compensated for.
A filter, comprising:
- a circuit including a first discrete magnetically-coupled winding, the first magnetically-coupled winding having at least first and second capacitor tap points;
- a first capacitor having a first end connected to the first capacitor tap point;
- and
- a second capacitor having a first end connected to the second capacitor tap point,
- wherein induction of the first magnetically-coupled winding provides cancellation of an effect of an equivalent series inductance of a first path through the first capacitor and an equivalent series inductance of a second path though the second capacitor, wherein an effect of capacitances of the first and second capacitors is not cancelled.
2 more elements
Dependencies are inferred from the claim text.