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Title:
CIRCUIT AND METHOD RESPONSIVE TO CURRENT DERIVED FROM VOLTAGE ACROSS ENERGY TRANSFER ELEMENT INPUT
Document Type and Number:
Japanese Patent JP2012085528
Kind Code:
A
Abstract:

To provide a circuit and method for a switched mode power supply having a regulated reflected voltage.

In one embodiment, a switched mode power supply includes a power supply regulator coupled between a positive input supply rail of the power supply and a primary winding of an energy transfer element. The reflected voltage across the primary winding of the energy transfer element is related to the output voltage across a secondary winding of the energy transfer element according to the turns ratio of the energy transfer element. The power supply regulator is coupled to regulate the reflected voltage across the primary winding, thereby regulating the output voltage across the secondary winding. The reflected voltage across the primary winding is sensed through a current representative of the reflected voltage received by the power supply regulator.


Inventors:
BALAKRISHNAN BALU
DAVID MICHAEL HEGH MATTHEW
Application Number:
JP2011283479A
Publication Date:
April 26, 2012
Filing Date:
December 26, 2011
Export Citation:
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Assignee:
POWER INTEGRATIONS INC
International Classes:
H02M3/28; H02M3/338; H02M3/335
Domestic Patent References:
JP2000041377A2000-02-08
JPH1132481A1999-02-02
JP2000354372A2000-12-19
JPH07143747A1995-06-02
JP2001025247A2001-01-26
JPH05316724A1993-11-26
JPH05153775A1993-06-18
JPH11122915A1999-04-30
Foreign References:
WO2000074221A12000-12-07
US4443839A1984-04-17
US5973945A1999-10-26
Attorney, Agent or Firm:
Kuro Fukami
Toshio Morita
Yoshihei Nakamura
Yutaka Horii
Hisato Noda
Nobuo Arakawa



 
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