Back to results
US 2018/0026602 A1Published application
Method and apparatus for dual notch ripple filtering
AssigneeGeneral Electric Company
InventorsMelissa Jean Freeman, Thomas George McFarland, Margaret Ann Wiza, Douglas Link
Life of this patent
Estimating the term…
Abstract
An apparatus includes a self-coupled transformer, a first band stop filter and a tank circuit connected in series with the first band stop filter between first and second windings of the self-coupled transformer. An inductor of the tank circuit acts as an out-of-phase third winding of the self-coupled transformer.
Claims9
An apparatus comprising:
- a self-coupled transformer having first, second, and third windings that are operatively connected in series between higher and lower potential input terminals, with the second winding connected out-of-phase to the first and third windings;
- a first band stop filter connected in series between the second and third windings of the self-coupled transformer;
- a first tuning capacitor connected in parallel across the second winding of the self-coupled transformer;
- and
- output terminals operatively connected between the first and second windings and between the second and third windings.
2 more elements
A method comprising:
- connecting first, second, and third windings of a self-coupled transformer in series across terminals of a pulse width modulated power supply, with one of the windings out-of-phase to the other windings;
- connecting a first tuning capacitor across the out-of-phase winding of the self-coupled transformer;
- connecting a first band stop filter in series between the out-of-phase winding of the self-coupled transformer and one of the other windings;
- and
- connecting a load across the first band stop filter and the first tuning capacitor;
- wherein the first band stop filter, the first tuning capacitor, and the out-of-phase winding provide a dual notch ripple cancellation filter between the pulse width modulated power supply and the load.
3 more elements
Dependencies are inferred from the claim text.