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Static inverter employing an assymetrically energized inductor

  • US 4,202,031 A
  • Filed: 11/01/1978
  • Issued: 05/06/1980
  • Est. Priority Date: 11/01/1978
  • Status: Expired due to Term
First Claim
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1. A static inverter comprising:

  • A. input terminals for connection to a source of dc potentials,B. an inductor having;

    1. a core of substantially linear magnetic material having a closed main magnetic path and including a small aperture in a segment of said path which partitions the cross-section of said main magnetic path into two branches and creates a low reluctance closed flux path,2. a primary power winding encircling the full core cross-section for generating flux around said main magnetic path,3. a feedback control winding encircling one of said branches for generating a flux around said low reluctance closed path having the same direction as said main flux in a first branch and an opposite direction in the second branch,4. a second feedback winding encircling said first branch,5. a third feedback winding encircling said second branch,C. an electrical gain element having control, common and output electrodes for intermittent energization of said inductor from said dc source,said primary power winding, said feedback control winding, and said gain element being serially connected between said dc input terminals so that normal conduction by said gain element causes flux along said main magnetic path in a first direction, storing magnetic energy, and non-conduction by said gain element causes said main flux to collapse, releasing magnetic energy and creating a high voltage surge,said second and third feedback windings being serially connected between said control and common electrodes, said second feedback winding in a sense to increase gain element conduction and said third feedback winding in a sense to decrease gain element conduction when the flux in said main magnetic path increases in said first direction and in the same sense in respect to flux encircling said low reluctance flux path, said three feedback windings forming a current transformer providing feedback in a sense to increase gain element conduction as the main flux in said first direction increases until saturation of said first branch prevents further current transformer action, said first branch saturation preventing further induction in said second feedback winding, and inducing a voltage in said third feedback winding in a sense to turn off said gain element,D. means coupled to said inductor for deriving an output when said gain element is turned on and off, andE. passive means for protecting said gain element from the inductive surge and energy released when said gain element is turned off.

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