US3708744A - Regulating and filtering transformer - Google Patents

Regulating and filtering transformer Download PDF

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Publication number
US3708744A
US3708744A US00172683A US3708744DA US3708744A US 3708744 A US3708744 A US 3708744A US 00172683 A US00172683 A US 00172683A US 3708744D A US3708744D A US 3708744DA US 3708744 A US3708744 A US 3708744A
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United States
Prior art keywords
magnetic core
wound
region
regulating
transformer
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Expired - Lifetime
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US00172683A
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English (en)
Inventor
D Stephens
J Banic
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ABB Inc USA
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Westinghouse Electric Corp
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Assigned to ABB POWER T&D COMPANY, INC., A DE CORP. reassignment ABB POWER T&D COMPANY, INC., A DE CORP. ASSIGNMENT OF ASSIGNORS INTEREST. Assignors: WESTINGHOUSE ELECTRIC CORPORATION, A CORP. OF PA.
Expired - Lifetime legal-status Critical Current

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    • G—PHYSICS
    • G05—CONTROLLING; REGULATING
    • G05F—SYSTEMS FOR REGULATING ELECTRIC OR MAGNETIC VARIABLES
    • G05F3/00—Non-retroactive systems for regulating electric variables by using an uncontrolled element, or an uncontrolled combination of elements, such element or such combination having self-regulating properties
    • G05F3/02—Regulating voltage or current
    • G05F3/04—Regulating voltage or current wherein the variable is ac
    • G05F3/06—Regulating voltage or current wherein the variable is ac using combinations of saturated and unsaturated inductive devices, e.g. combined with resonant circuit

Definitions

  • This invention relates, in general, to regulating transformers and, more particularly, to regulating transformers of the parametric type.
  • the gap distance of the air gap is relatively critical for proper operation ofthe transformer.
  • the output winding is connected in parallel circuit relationship with a capacitor to form a resonant tank circuit which SUMMARY OF THE INVENTION
  • This invention provides a regulating and filtering transformer wherein the magnetic paths therefor are provided by two separate magnetic cores. A saturing and two yoke portions. The gap distance of the twoair gaps are equal.
  • the air gaps may be provided more economically and the gap adjusting procedure is simpler than in the prior art core arrangehas a resonant frequency equal to the operating frequency of the transformer. Due to tolerance changes in the capacitor and to variations in the magnetic core and winding structure, it is often necessary to tune the output circuit to resonance by adjusting the air gap.
  • the core isconstructed without any air gaps.
  • the core is then cut across the legs to form at least two core sections.
  • the length of the cut leg on one, or both, of the sections is ground or milled, thus making it shorter than the other leg portions.
  • a regulating and filtering transformer which contains an air gap in the output portion of the magnetic core which may be constructed without the necessity of machining a core leg to provide the ment. Since both gap distances are equal, separate machining of one leg is unnecessary. After the core has been cut in half, the two halves are merely positioned a sufficient distance apart to provide the required air gap.
  • at least one of the core legs does not contain any air gap, or contain an air gap having a different gap distance than the gap in the output leg. Consequently, moving the core halves BRIEF DESCRIPTION OF THE DRAWINGS Further advantages and uses of this invention will become more apparent when consideredin view of the following detailed description and drawings, in which:
  • FIG. 1 is a view of a transformer constructed according to the teachings of this invention having magnetic cores of the stacked lamination type;
  • FIG. 1A is a partial view of the transformer shown in FIG. 1 with the air gaps positioned in different planes;
  • FIG. 2 is a view of a transformer constructed accord ing to the teachings of this invention having magnetic cores of the wound type.
  • the magnetic core 10 is constructed of a plurality of layers of metallic laminations.
  • the magnetic core 10 includes a first region 12 and'a second region l4. Adjacent to the magnetic core is the magnetic core 16, which has a first region 18 and a second region 20.
  • a source of alternating voltage 22 is connected to an input winding 24.
  • the input winding 24 is positioned around the second region 14 of the magnetic core 10 and the first region 18 of the magnetic core 16 and an output winding 26 is positioned over the second region of the magnetic core 16 and connected in parallel circuit relationship with a capacitor 28.
  • the output winding 26 and the capacitor 28 form a resonant tank circuit.
  • the load circuit 30, which is electrically connected to the tank circuit, represents the load on the transformer.
  • the resonant frequency of the tank circuit is substantially equal to the frequency of operation of the transformer, such as 60 hertz.
  • the magnetic core 16 contains air gaps 32 and 34 which are located in regions 18 and 20, respectively.
  • the gap distance of the air gaps 32 and 34 are equal, and, in the embodiment illustrated in FIG. 1, are positioned in a plane which perpendicularly bisects the core regions 18 and 20.
  • the gaps may be positioned in the yoke regions of the magnetic core 16 without departing from the teachings of the invention or reducing the usefulness thereof. It is also within the contemplation of this invention that the air gaps may be positioned in different planes, such as the air gaps 36 and 38 illustrated in FIG. 1A.
  • FIG. 1 The electrical operation of the transformer illustrated in FIG. 1 is similar to the operation of the transformer disclosed in U.S. Pat. No. 3,584,290, issued on June 8, l97l. Another description of the operation is contained in the Westinghouse Engineer," March, 197 l pages 42 to 45.
  • the core 10 is constructed of a suitable material, such as grain oriented silicon steel, and has dimensions which cause the core to saturate during part of each half-cycle of the alternating flux induced by the input winding 24.
  • the reluctance of the magnetic core 10 is lower than the reluctance of the magnetic core 16.
  • the output winding 26 is only slightly linked by the flux provided by the input winding 24.
  • the air gaps 32 and 34 in the magnetic core 16 linearize the reluctance thereof and provide a means to tune the tank circuit comprising output winding 26 and the capacitor 28 to resonance. Since manufacturing tolerances of the capacitor 28, the output winding 26 and the magnetic core 16 may combine to prevent proper resonance of the tank circuit, means must be provided to compensate for the tolerances of manufacturing.
  • the gaps may be maintained by placing a suitable non-magnetic material therein and clamping the halves of the core 16 together, by means which is not illustrated in FIG. 1.
  • the ease with which the air gaps 32 and 34 may be established is an important advantage of this invention. After the core 16 has been cut in half, only the separa tion distance of the two halves of the core 16 need be established to set the air gaps 32 and 34. In the prior art arrangement, is necessary to machine a half portion of one leg of the core to establish the air gap distance. Adjustment of the air gaps 32 and 34 is also an advantageous feature of the core constructed according to this invention. Additional machining is required by the prior art arrangement. According to the teachings of this invention, the air gaps 32 and 34 may be changed without extra machining of the core, simply by moving the two halves of the core 16 together or apart.
  • FIG. 2 illustrates a regulating and filtering transformer constructed according to the teachings of this invention.
  • the magnetic core 40 is constructed by winding a magnetic material in the form of the core.
  • the magnetic core 42 is similarly constructed, but is dimensioned and constructed so that it will not saturate at the induced flux level which will saturate the magnetic core 40.
  • An input winding 44 is positioned over the cores 40 and 42 and connected to an alternating voltage generator 46.
  • An output coil 48 is positioned over the magnetic core 42 and connected to the capacitor 50 and the load circuit 52.
  • the air gaps 54 and 56 in the legs of the core 42 function similar to the air gaps 32 and 34 in the core 16 of the transformer illustrated in FIG. 1.
  • the joints 58 and 60 in core 40 are produced by cutting the wound core 40 in half to allow placement of the input winding 44 thereon.
  • a 120 VA regulating and filtering transformer constructed according to this invention was tested and it was observed that the output voltage remained constantly at I 16.0 volts while the input voltage was changed from I05 volts to I30 volts in 5-volt steps. It was also observed that the noise filtering and input distortion was equally as good as the prior art regulating and filtering transformer.
  • a regulating and filtering transformer comprising a first magnetic core having first and second regions, a second magnetic core having first and second regions, an input winding having a plurality of turns with each of said turns wound around the second region of said first magnetic core and the first region of said second magnetic core to induce alternating flux therein, an output winding which links the flux in the second region of said second magnetic core and which is connected in parallel circuit relationship with a capacitor to provide a resonant tank circuit, said first magnetic core being constructed and dimensioned to cause it to saturate during a portion of each half-cycle of the alternating flux therein, said second magnetic core being constructed and dimensioned to provide a higher reluctance path for the alternating flux induced by said input winding than the path provided by said first magnetic core when said first magnetic core is not saturated, and said second magnetic core being constructed and dimensioned to provide a lower reluctance path for the alternating flux produced by said input winding than the path provided by said first magnetic core when said first magnetic core is saturated.
  • the regulating-transformer of claim 1 wherein the second magnetic core includes two air gaps for increasing the reluctance of the magnetic core, one of the air gaps being positioned in the first region of said second magnetic core and the other of said air gaps being positioned in the second region of said second magnetic core.
  • a regulating and filtering transformer comprising a first wound magnetic core having first and second regions, a second wound magnetic core having first and second regions, and an input winding having a plurality of turns with each of said turns wound around the second region of said first wound magnetic core and the first region of said second wound magneticcore, said input winding inducing alternating flux into said first and second wound magnetic cores, an output winding positioned around the second region of said second magnetic core and connected in parallel circuit relationship with a capacitor to provide a resonant tank circuit, said first magnetic core beingconstructed and dimensioned to cause it to saturate during a portion of each half-cycle of the alternating flux therein, said second wound magnetic core being dimensioned and containing air gaps to provide, when said first wound magnetic core is not saturated, a higher reluctance path for the alternating flux provided by said input winding than the path provided by said first wound magnetic core, said second wound magnetic core providing,

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • General Physics & Mathematics (AREA)
  • Radar, Positioning & Navigation (AREA)
  • Automation & Control Theory (AREA)
  • Coils Or Transformers For Communication (AREA)
US00172683A 1971-08-18 1971-08-18 Regulating and filtering transformer Expired - Lifetime US3708744A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US17268371A 1971-08-18 1971-08-18

Publications (1)

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US3708744A true US3708744A (en) 1973-01-02

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JP (2) JPS4839928A (ja)
CA (1) CA947386A (ja)

Cited By (58)

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US4019122A (en) * 1974-08-14 1977-04-19 Telcon-Magnetic Cores Limited Stabilized power supplies
US4032836A (en) * 1975-11-28 1977-06-28 The Gillette Company Transformer circuit
US4134044A (en) * 1976-02-02 1979-01-09 Esquire, Inc. High frequency circuit for operating a high-intensity gaseous discharge lamp
DE2946283A1 (de) * 1979-11-16 1981-05-27 Ulrich 4900 Herford Weber Anordnung zur umwandlung und stabilisierung von elektrischen wechselspannungen
US4288773A (en) * 1978-12-06 1981-09-08 General Electric Company Amorphous metal ballasts and reactors
US4345229A (en) * 1978-12-06 1982-08-17 General Electric Company Amorphous metal ballasts and reactors
US4422056A (en) * 1981-09-28 1983-12-20 General Electric Company Integrated multi-stage electrical filter
WO1987005412A1 (en) * 1986-02-28 1987-09-11 Elektrene S.R.L. Improvements in ferroresonant constant-voltage transformers
US4841428A (en) * 1988-03-18 1989-06-20 Hughes Aircraft Company Non-saturating magnetic amplifier controller
US5136453A (en) * 1990-04-04 1992-08-04 Oliver Bernard M Method and means for suppressing geomagnetically induced currents
US5378966A (en) * 1992-12-16 1995-01-03 Ncr Corporation Flux captivated emission controlled flyback transformer
US5422620A (en) * 1988-01-14 1995-06-06 Susanne Riedi-Joks Transformer
US5515262A (en) * 1992-10-21 1996-05-07 Hitran Corporation Variable inductance current limiting reactor
US5537026A (en) * 1995-04-26 1996-07-16 Emerson Electric Co. Method and apparatus for power controller operation using master and slave firing units
US6617814B1 (en) 2001-04-11 2003-09-09 Rockwell Automation Technologies, Inc. Integrated DC link choke and method for suppressing common-mode voltage in a motor drive
US20050024179A1 (en) * 2002-04-18 2005-02-03 Rockwell Scientific Licensing, Llc Extended E matrix integrated magnetics (MIM) core
US6987372B1 (en) 2001-04-11 2006-01-17 Rockwell Automation Technologies, Inc. Integrated DC link choke and method for suppressing common-mode voltage in a motor drive
US20060038649A1 (en) * 2004-08-19 2006-02-23 Rockwell Scientific Licensing, Llc Winding structure for efficient switch-mode power converters
US20060038650A1 (en) * 2004-08-19 2006-02-23 Rockwell Scientific Licensing, Llc Vertical winding structures for planar magnetic switched-mode power converters
US20060038549A1 (en) * 2004-08-19 2006-02-23 Rockwell Scientific Licensing, Llc Vertically packaged switched-mode power converter
US20060139971A1 (en) * 2004-12-28 2006-06-29 Tdk Corporation Noise suppressor
US20060187684A1 (en) * 2005-02-08 2006-08-24 Sriram Chandrasekaran Power converter employing integrated magnetics with a current multiplier rectifier and method of operating the same
US20060198173A1 (en) * 2005-02-23 2006-09-07 Rozman Allen F Control circuit for a depletion mode switch and method of operating the same
US7132812B1 (en) 2001-04-11 2006-11-07 Rockwell Automation Technologies, Inc. Integrated DC link choke and method for suppressing common-mode voltage in a motor drive
US20070114979A1 (en) * 2005-02-23 2007-05-24 Sriram Chandrasekaran Power converter employing a tapped inductor and integrated magnetics and method of operating the same
US20070185754A1 (en) * 2006-02-07 2007-08-09 Sap Ag Task responsibility system
US20080054874A1 (en) * 2006-08-31 2008-03-06 Sriram Chandrasekaran Power Converter Employing Regulators with a Coupled Inductor
US20080130321A1 (en) * 2006-12-01 2008-06-05 Artusi Daniel A Power converter with an adaptive controller and method of operating the same
US20080130322A1 (en) * 2006-12-01 2008-06-05 Artusi Daniel A Power system with power converters having an adaptive controller
US20080150666A1 (en) * 2005-02-23 2008-06-26 Sriram Chandrasekaran Power Converter Employing a Tapped Inductor and Integrated Magnetics and Method of Operating the Same
US20080232141A1 (en) * 2006-12-01 2008-09-25 Artusi Daniel A Power System with Power Converters Having an Adaptive Controller
US20080315852A1 (en) * 2007-06-19 2008-12-25 Chandrasekaran Jayaraman System and Method for Estimating Input Power for a Power Processing Circuit
US20090090557A1 (en) * 2007-10-09 2009-04-09 Particle Drilling Technologies, Inc. Injection System And Method
US20090097290A1 (en) * 2007-03-14 2009-04-16 Sriram Chandrasekaran Isolated Power Converter
US20100165667A1 (en) * 2006-12-01 2010-07-01 Artusi Daniel A Power System with Power Converters Having an Adaptive Controller
US20100182806A1 (en) * 2009-01-19 2010-07-22 Paul Garrity Controller for a Power Converter
US20100321958A1 (en) * 2009-06-17 2010-12-23 Antony Brinlee Power Converter Employing a Variable Switching Frequency and a Magnetic Device with a Non-Uniform Gap
US20110134664A1 (en) * 2009-12-03 2011-06-09 Berghegger Ralf Schroeder Genannt Startup Circuit and Power Converter Employing the Same
US20110149607A1 (en) * 2009-12-18 2011-06-23 Aaron Jungreis Controller for a Power Converter
US20110182089A1 (en) * 2010-01-22 2011-07-28 Genannt Berghegger Ralf Schroeder Controller for a Power Converter and Method of Operating the Same
US20110239008A1 (en) * 2010-03-26 2011-09-29 Lam Kean W Power Adapter Having a Universal Serial Bus Hub
US8638578B2 (en) 2009-08-14 2014-01-28 Power System Technologies, Ltd. Power converter including a charge pump employable in a power adapter
US8643222B2 (en) 2009-06-17 2014-02-04 Power Systems Technologies Ltd Power adapter employing a power reducer
US8767418B2 (en) 2010-03-17 2014-07-01 Power Systems Technologies Ltd. Control system for a power converter and method of operating the same
US8792257B2 (en) 2011-03-25 2014-07-29 Power Systems Technologies, Ltd. Power converter with reduced power dissipation
US8792256B2 (en) 2012-01-27 2014-07-29 Power Systems Technologies Ltd. Controller for a switch and method of operating the same
US20140266534A1 (en) * 2013-03-15 2014-09-18 Emerson Network Power, Energy Systems, North America, Inc. Transformer
US9019061B2 (en) 2009-03-31 2015-04-28 Power Systems Technologies, Ltd. Magnetic device formed with U-shaped core pieces and power converter employing the same
US9077248B2 (en) 2009-06-17 2015-07-07 Power Systems Technologies Ltd Start-up circuit for a power adapter
US9088216B2 (en) 2009-01-19 2015-07-21 Power Systems Technologies, Ltd. Controller for a synchronous rectifier switch
US9099232B2 (en) 2012-07-16 2015-08-04 Power Systems Technologies Ltd. Magnetic device and power converter employing the same
US9106130B2 (en) 2012-07-16 2015-08-11 Power Systems Technologies, Inc. Magnetic device and power converter employing the same
US9190898B2 (en) 2012-07-06 2015-11-17 Power Systems Technologies, Ltd Controller for a power converter and method of operating the same
US9197132B2 (en) 2006-12-01 2015-11-24 Flextronics International Usa, Inc. Power converter with an adaptive controller and method of operating the same
US9214264B2 (en) 2012-07-16 2015-12-15 Power Systems Technologies, Ltd. Magnetic device and power converter employing the same
US9240712B2 (en) 2012-12-13 2016-01-19 Power Systems Technologies Ltd. Controller including a common current-sense device for power switches of a power converter
US9246391B2 (en) 2010-01-22 2016-01-26 Power Systems Technologies Ltd. Controller for providing a corrected signal to a sensed peak current through a circuit element of a power converter
US9379629B2 (en) 2012-07-16 2016-06-28 Power Systems Technologies, Ltd. Magnetic device and power converter employing the same

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Cited By (88)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4019122A (en) * 1974-08-14 1977-04-19 Telcon-Magnetic Cores Limited Stabilized power supplies
US4032836A (en) * 1975-11-28 1977-06-28 The Gillette Company Transformer circuit
US4134044A (en) * 1976-02-02 1979-01-09 Esquire, Inc. High frequency circuit for operating a high-intensity gaseous discharge lamp
US4288773A (en) * 1978-12-06 1981-09-08 General Electric Company Amorphous metal ballasts and reactors
US4345229A (en) * 1978-12-06 1982-08-17 General Electric Company Amorphous metal ballasts and reactors
DE2946283A1 (de) * 1979-11-16 1981-05-27 Ulrich 4900 Herford Weber Anordnung zur umwandlung und stabilisierung von elektrischen wechselspannungen
US4422056A (en) * 1981-09-28 1983-12-20 General Electric Company Integrated multi-stage electrical filter
WO1987005412A1 (en) * 1986-02-28 1987-09-11 Elektrene S.R.L. Improvements in ferroresonant constant-voltage transformers
US5422620A (en) * 1988-01-14 1995-06-06 Susanne Riedi-Joks Transformer
US4841428A (en) * 1988-03-18 1989-06-20 Hughes Aircraft Company Non-saturating magnetic amplifier controller
US5136453A (en) * 1990-04-04 1992-08-04 Oliver Bernard M Method and means for suppressing geomagnetically induced currents
US5515262A (en) * 1992-10-21 1996-05-07 Hitran Corporation Variable inductance current limiting reactor
US5378966A (en) * 1992-12-16 1995-01-03 Ncr Corporation Flux captivated emission controlled flyback transformer
US5537026A (en) * 1995-04-26 1996-07-16 Emerson Electric Co. Method and apparatus for power controller operation using master and slave firing units
US6987372B1 (en) 2001-04-11 2006-01-17 Rockwell Automation Technologies, Inc. Integrated DC link choke and method for suppressing common-mode voltage in a motor drive
US6617814B1 (en) 2001-04-11 2003-09-09 Rockwell Automation Technologies, Inc. Integrated DC link choke and method for suppressing common-mode voltage in a motor drive
US7132812B1 (en) 2001-04-11 2006-11-07 Rockwell Automation Technologies, Inc. Integrated DC link choke and method for suppressing common-mode voltage in a motor drive
US7633369B2 (en) 2002-04-18 2009-12-15 Flextronics International Usa, Inc. Extended E matrix integrated magnetics (MIM) core
US8134443B2 (en) 2002-04-18 2012-03-13 Flextronics International Usa, Inc. Extended E matrix integrated magnetics (MIM) core
US7280026B2 (en) 2002-04-18 2007-10-09 Coldwatt, Inc. Extended E matrix integrated magnetics (MIM) core
US20050024179A1 (en) * 2002-04-18 2005-02-03 Rockwell Scientific Licensing, Llc Extended E matrix integrated magnetics (MIM) core
US20100091522A1 (en) * 2002-04-18 2010-04-15 Sriram Chandrasekaran Extended E Matrix Integrated Magnetics (MIM) Core
US20080111657A1 (en) * 2004-08-19 2008-05-15 Vivek Mehrotra Vertical Winding Structures for Planar Magnetic Switched-Mode Power Converters
US20060038649A1 (en) * 2004-08-19 2006-02-23 Rockwell Scientific Licensing, Llc Winding structure for efficient switch-mode power converters
US20060038650A1 (en) * 2004-08-19 2006-02-23 Rockwell Scientific Licensing, Llc Vertical winding structures for planar magnetic switched-mode power converters
US7012414B1 (en) * 2004-08-19 2006-03-14 Coldwatt, Inc. Vertically packaged switched-mode power converter
US20060038549A1 (en) * 2004-08-19 2006-02-23 Rockwell Scientific Licensing, Llc Vertically packaged switched-mode power converter
US7554430B2 (en) 2004-08-19 2009-06-30 Flextronics International Usa, Inc. Vertical winding structures for planar magnetic switched-mode power converters
US7321283B2 (en) 2004-08-19 2008-01-22 Coldwatt, Inc. Vertical winding structures for planar magnetic switched-mode power converters
US7427910B2 (en) 2004-08-19 2008-09-23 Coldwatt, Inc. Winding structure for efficient switch-mode power converters
US7193869B2 (en) * 2004-12-28 2007-03-20 Tdk Corporation Noise suppressor
US20060139971A1 (en) * 2004-12-28 2006-06-29 Tdk Corporation Noise suppressor
US20060187684A1 (en) * 2005-02-08 2006-08-24 Sriram Chandrasekaran Power converter employing integrated magnetics with a current multiplier rectifier and method of operating the same
US7417875B2 (en) 2005-02-08 2008-08-26 Coldwatt, Inc. Power converter employing integrated magnetics with a current multiplier rectifier and method of operating the same
US7675764B2 (en) 2005-02-08 2010-03-09 Flextronics International Usa, Inc. Power converter employing integrated magnetics with a current multiplier rectifier and method of operating the same
US7298118B2 (en) 2005-02-23 2007-11-20 Coldwatt, Inc. Power converter employing a tapped inductor and integrated magnetics and method of operating the same
US7385375B2 (en) 2005-02-23 2008-06-10 Coldwatt, Inc. Control circuit for a depletion mode switch and method of operating the same
US7876191B2 (en) 2005-02-23 2011-01-25 Flextronics International Usa, Inc. Power converter employing a tapped inductor and integrated magnetics and method of operating the same
US20080150666A1 (en) * 2005-02-23 2008-06-26 Sriram Chandrasekaran Power Converter Employing a Tapped Inductor and Integrated Magnetics and Method of Operating the Same
US20060198173A1 (en) * 2005-02-23 2006-09-07 Rozman Allen F Control circuit for a depletion mode switch and method of operating the same
US20070114979A1 (en) * 2005-02-23 2007-05-24 Sriram Chandrasekaran Power converter employing a tapped inductor and integrated magnetics and method of operating the same
US20070185754A1 (en) * 2006-02-07 2007-08-09 Sap Ag Task responsibility system
US20080054874A1 (en) * 2006-08-31 2008-03-06 Sriram Chandrasekaran Power Converter Employing Regulators with a Coupled Inductor
US8125205B2 (en) 2006-08-31 2012-02-28 Flextronics International Usa, Inc. Power converter employing regulators with a coupled inductor
US8477514B2 (en) 2006-12-01 2013-07-02 Flextronics International Usa, Inc. Power system with power converters having an adaptive controller
US7667986B2 (en) 2006-12-01 2010-02-23 Flextronics International Usa, Inc. Power system with power converters having an adaptive controller
US7675758B2 (en) 2006-12-01 2010-03-09 Flextronics International Usa, Inc. Power converter with an adaptive controller and method of operating the same
US7675759B2 (en) 2006-12-01 2010-03-09 Flextronics International Usa, Inc. Power system with power converters having an adaptive controller
US20080130322A1 (en) * 2006-12-01 2008-06-05 Artusi Daniel A Power system with power converters having an adaptive controller
US7889517B2 (en) 2006-12-01 2011-02-15 Flextronics International Usa, Inc. Power system with power converters having an adaptive controller
US20100165667A1 (en) * 2006-12-01 2010-07-01 Artusi Daniel A Power System with Power Converters Having an Adaptive Controller
US9197132B2 (en) 2006-12-01 2015-11-24 Flextronics International Usa, Inc. Power converter with an adaptive controller and method of operating the same
US20080130321A1 (en) * 2006-12-01 2008-06-05 Artusi Daniel A Power converter with an adaptive controller and method of operating the same
US20080232141A1 (en) * 2006-12-01 2008-09-25 Artusi Daniel A Power System with Power Converters Having an Adaptive Controller
US20090097290A1 (en) * 2007-03-14 2009-04-16 Sriram Chandrasekaran Isolated Power Converter
US8502520B2 (en) 2007-03-14 2013-08-06 Flextronics International Usa, Inc Isolated power converter
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JPS539428U (ja) 1978-01-26
JPS4839928A (ja) 1973-06-12
CA947386A (en) 1974-05-14

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