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:
May. 24, 2016
Filed:
Apr. 01, 2013
Applicant:
Apple Inc., Cupertino, CA (US);
Inventors:
Yongxuan Hu, Cupertino, CA (US);
Keong W. Kam, Santa Clara, CA (US);
Shimon Elkayam, San Jose, CA (US);
Susan R. Schen, San Francisco, CA (US);
Assignee:
Apple Inc., Cupertino, CA (US);
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
H02M 3/338 (2006.01); H02M 1/44 (2007.01); H02M 3/158 (2006.01); H02M 3/335 (2006.01);
U.S. Cl.
CPC ...
H02M 1/44 (2013.01); H02M 3/158 (2013.01); H02M 3/33507 (2013.01);
Abstract
A switched-mode power supply with reduced electromagnetic interference (EMI) is described. This switched-mode power supply includes a modulation circuit that continuously frequency modulates a control signal over a bandwidth associated with a spread-spectrum modulation signal. By frequency modulating the control signal in the switched-mode power supply, spectral content associated with a modulated switching signal is spread evenly over the bandwidth, thereby reducing the EMI.