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:
Mar. 20, 2001
Filed:
Mar. 16, 2000
Applicant:
Inventor:
Jon R. Roman, Boynton Beach, FL (US);
Assignee:
Micrel Incorporated, San Jose, CA (US);
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
G05F 1/40 ;
U.S. Cl.
CPC ...
G05F 1/40 ;
Abstract
A switching regulator for reducing electromagnetic interference (EMI) includes a PWM controller which incorporates a varying frequency oscillator for controlling the operating frequency of the switching regulator. The varying frequency oscillator provides an oscillating signal having a continuously varying frequency about the center switching frequency of the switching regulator. The varying frequency oscillating signal causes the operating frequency of the switching regulator to vary, spreading out the EMI noise generated by the switching regulator and effectively reducing the peak energy of the EMI noise.