US 6,982,621 B2 | ||
Method and apparatus for substantially reducing electrical displacement current flow between input and output windings of an energy transfer element | ||
Chan Woong Park, San Jose, Calif. (US) | ||
Assigned to Power Integrations, Inc., San Jose, Calif. (US) | ||
Filed on Apr. 01, 2003, as Appl. No. 10/405,373. | ||
Prior Publication US 2004/0196668 A1, Oct. 07, 2004 | ||
Int. Cl. H01F 27/02 (2006.01) |
U.S. Cl. 336—84C | 9 Claims |
1. An energy transfer element, comprising:
an input winding to be coupled to an input circuit;
an output winding to be coupled to an output circuit;
an electrically conductive shield coupled to the input winding; and
a first cancellation winding to be coupled through a switch to the input winding only when the switch is closed, the first
cancellation winding wound to substantially reduce a net capacitive displacement current between the input circuit and the
output circuit.
|