Electricity: power supply or regulation systems – Output level responsive – Using a three or more terminal semiconductive device as the...
Reexamination Certificate
2011-04-19
2011-04-19
Sterrett, Jeffrey L (Department: 2838)
Electricity: power supply or regulation systems
Output level responsive
Using a three or more terminal semiconductive device as the...
C323S222000, C323S283000, C323S288000
Reexamination Certificate
active
07928712
ABSTRACT:
The present invention is a switching power supply that switches (dithers) between at least two switching frequencies without introducing a ripple signal at the dithering frequency, which is based on the time duration of a dithering cycle. In one embodiment of the present invention, an average current in an energy transfer element, such as an inductive element, during operation using one switching frequency is regulated to be approximately equal to the average current during operation using any other switching frequency. The average current may be regulated by controlling the durations of transition periods between operating using one switching frequency and operating using another switching frequency. By maintaining a constant average current while operating using different switching frequencies, dithering frequency ripple may be significantly reduced or eliminated.
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patent: 7058374 (2006-06-01), Levesque et al.
patent: 2006/0017426 (2006-01-01), Yang et al.
“DC-to-DC Converter Combats EMI,” May 28, 2002, Application Note 1077, http://www.maxim-ic.com/an1077, Maxim Integrated Products.
Berchtold Jean-Christophe
Colles Joseph H.
Levesque Chris
Finch, III Fred E
RF Micro Devices, Inc.
Sterrett Jeffrey L
Withrow & Terranova, P.L.L.C.
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