The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Aug. 09, 2005
Filed:
Nov. 13, 2002
Richard Farrington, Heath, TX (US);
Abram P. Dancy, Shrewsbury, MA (US);
Leif E. Lawhite, Lebanon, NH (US);
Martin F. Schlecht, Lexington, MA (US);
Richard Farrington, Heath, TX (US);
Abram P. Dancy, Shrewsbury, MA (US);
Leif E. LaWhite, Lebanon, NH (US);
Martin F. Schlecht, Lexington, MA (US);
SynQor, Inc., Boxborough, MA (US);
Abstract
Half-bridge isolation stage topologies are provided in power converters, dividing an input voltage between capacitors. Primary transformer windings are periodically switched across respective capacitors. In current-fed implementations, the current flow through the primary windings is constrained as by an inductive element. In some implementations, a capacitor, primary winding and switch are connected in series in different orders in each of plural legs across the input. Current feed circuitry includes a current constraining component connecting nodes within each of respective legs. The switches of the isolation stage may be turned on with a fixed duty cycle, and a secondary circuit may comprise synchronous rectifiers.