The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Apr. 10, 2012
Filed:
Nov. 06, 2008
Marvin C. Espino, San Jose, CA (US);
Marvin C. Espino, San Jose, CA (US);
Power Integrations, Inc., San Jose, CA (US);
Abstract
A method includes calculating a number of turns of a shield winding included in an energy transfer element of a power supply, where the calculating is to have a low noise current in an input conductor of the power supply. The method further includes: increasing the number of turns for the shield winding; operating the power supply; and adjusting a value of a shield impedance to substantially reduce the noise current. An apparatus includes a power supply having an energy transfer element and a shield impedance. The energy transfer element includes a shield winding having an end terminated externally to the energy transfer element. The shield impedance is coupled between the externally terminated end of the shield winding and an input conductor of the power supply, where the shield impedance has a non-zero finite impedance value to substantially reduce a noise current in the input conductor.