Is a
Patent attributes
Current Assignee
Patent Jurisdiction
Patent Number
Patent Inventor Names
Michael J. O'Loughlin0
Date of Patent
March 27, 2007
Patent Application Number
11210032
Date Filed
August 23, 2005
Patent Primary Examiner
Patent abstract
A circuit and method of dithering the switching frequency of an off-line power factor corrected (PFC) pre-regulator. The circuitry used to dither the frequency is advantageously accomplished by taking advantage of the PWM's internal timing circuitry. This invention reduces narrow band EMI and eliminates the need to provide specialty PWM controllers to achieve dithering.
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