Electric power conversion systems – Current conversion – Including automatic or integral protection means
Reexamination Certificate
2008-09-19
2010-12-28
Nguyen, Matthew V (Department: 2838)
Electric power conversion systems
Current conversion
Including automatic or integral protection means
C363S021040
Reexamination Certificate
active
07859869
ABSTRACT:
A control circuit for use in a power converter in one aspect limits the magnetic flux in a transformer of a switching power converter. A first controlled current source has a first current that is substantially directly proportional to an input voltage to be applied to a winding of the transformer. A second controlled current source has a second current that is substantially directly proportional to a reset voltage to be applied to the winding of the transformer. A first switch is adapted to charge an integrating capacitor with the first current while the input voltage is applied to the winding of the transformer. A second switch is adapted to discharge the integrating capacitor with the second current when the reset voltage is applied to the winding of the transformer. A third switch is adapted to remove and to prevent application of the input voltage to the winding of the transformer.
REFERENCES:
patent: 4127894 (1978-11-01), Bishop et al.
patent: 4439822 (1984-03-01), Cocconi
patent: 5355299 (1994-10-01), Carpita
Blakely , Sokoloff, Taylor & Zafman LLP
Nguyen Matthew V
Power Integrations, Inc.
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