High efficiency coupled inductor soft switching power converters
Number of patents in Portfolio can not be more than 2000
United States of America Patent
Stats
-
Aug 7, 2001
Issued Date -
N/A
app pub date -
May 23, 2000
filing date -
May 15, 1999
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
The power converter of this invention accomplishes zero voltage switching at both turn on and turn off transitions of all primary switches. A pair of coupled inductors serve as both energy storage devices and isolation mechanisms. The placement of a small inductor in series with the coupled inductors enables the invariance of primary current direction throughout the switching transition which provides for zero voltage switching for all switches for all transitions. The power converter behaves as a pair of interleaved coupled inductor buck converters with oppositely directed magnetizing currents. During a first half cycle, while one inductor is coupled to the output, the other uncoupled inductor behaves as a current source, setting the primary winding currents for both inductors equal to the magnetizing current of the uncoupled inductor. The inductor which is coupled to the output appears as an output filter capacitor or voltage source to the uncoupled inductor during the first half cycle. During the alternate half cycle the roles of the two inductors are reversed.
First Claim
Other Claims data not available