By a News Reporter-Staff News Editor at Defense & Aerospace Week -- From Alexandria, Virginia, VerticalNews journalists report that a patent by the inventors Jacobson, Boris S. (Westford, MA); Jung, Edward (Marlborough, MA), filed on March 9, 2012, was published online on July 8, 2014.
The patent's assignee for patent number 8773231 is Raytheon Company (Waltham, MA).
News editors obtained the following quote from the background information supplied by the inventors: "The present invention relates to power converters, and more specifically, to power converters driving controllable inductors.
"Converters using linearly controllable inductors rely on magnetic structures such as, for example, a double E-core 100 as shown in FIG. 1 having a main coil 102 bound around a gapped center leg of the core 100 and two series connected auxiliary coils 104 with the same number of turns wound around outlying legs. Two main windings (not shown) may be wound on each side of the air gap to reduce wire losses caused by fringing flux. The auxiliary coils generate flux in the same direction in the outer legs and in the opposite direction in the center leg. Flux cancellation in the center leg results in no net flux in the main coil. Neglecting non-linear effects, the coupling between the main and series connected auxiliary winding approaches zero.
"Previous methods for generating control current include both linear and switch-mode power circuits that generate current in the control winding of the inductor."
As a supplement to the background information on this patent, VerticalNews correspondents also obtained the inventors' summary information for this patent: "According to one embodiment of the present invention, a multiphase inductor includes a first core, a second core, a third core, a fourth core, a center leg partially defined by a portion of the first core, a portion of the second core, a portion of the third core, and a portion of the fourth core, a first outer leg partially defined by a second portion of the first core, a second outer leg partially defined by a second portion of the second core, a third outer leg partially defined by a second portion of the third core, a fourth outer leg partially defined by a second portion of the fourth core, a main winding wound around a portion of the center leg, a first control winding wound around a portion of the first leg, a second control winding wound around a portion of the second leg, a third control winding wound around a portion of the third leg, and a fourth control winding wound around a portion of the fourth leg.
"According to another embodiment of the present invention, a method for reducing ripple current in a multi-phase inductor includes fabricating a multi-phase inductor having a core winding portion and two pairs of auxiliary windings, designating a first pair of auxiliary windings that are 180.degree. out of phase, and coupling the first pair of windings with a first pair of opposing plates such that the first pair of opposing plates are operative to reduce the relative ripple current induced by the first pair of auxiliary windings into a second pair of windings in the multi-phase inductor.
"According to yet another embodiment of the present invention, a controllable inductor system includes a multiphase inductor comprising a central winding, a first control winding, and a second control winding, and a control portion comprising a first control logic portion operative to receive a signal indicative of a current of the first control winding and a signal indicative of a current of the sum of the first control winding and the second control winding and modulate a first pulse width modulated signal to responsively control a first transistor connected to the first control winding, and a second control logic portion operative to receive the signal indicative of the current of the first control winding and a signal indicative of a current of the sum of the first control winding and the second control winding and modulate a second pulse width modulated signal to responsively control a second transistor connected to the second control winding.
"Additional features and advantages are realized through the techniques of the present invention. Other embodiments and aspects of the invention are described in detail herein and are considered a part of the claimed invention. For a better understanding of the invention with the advantages and the features, refer to the description and to the drawings."
For additional information on this patent, see: Jacobson, Boris S.; Jung, Edward. Multiphase Power Converters Involving Controllable Inductors. U.S. Patent Number 8773231, filed March 9, 2012, and published online on July 8, 2014. Patent URL: http://patft.uspto.gov/netacgi/nph-Parser?Sect1=PTO1&Sect2=HITOFF&d=PALL&p=1&u=%2Fnetahtml%2FPTO%2Fsrchnum.htm&r=1&f=G&l=50&s1=8773231.PN.&OS=PN/8773231RS=PN/8773231
Keywords for this news article include: Raytheon Company, Aerospace and Defense Companies.
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