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:
Nov. 19, 1996
Filed:
May. 22, 1995
Applicant:
Inventor:
Alexander S Keir, Chelmsford, MA (US);
Assignees:
Kaman Electromagnetics Corporation, Hudson, MA (US);
Newport News Shipbuilding and Dry Dock Company, Newport News, VA (US);
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
H02H / ;
U.S. Cl.
CPC ...
363 56 ; 363132 ;
Abstract
A resonant recovery circuit operates to discharge switching energy losses stored in a snubber capacitor associated with each pole of an inverter to return the discharged current to the DC supply by means of an inductor coupled to the resonant recovery switch. In a multiple pole inverter, the snubber capacitors associated with each of the pole's switching devices is sequentially discharged during the clock cycle of the switching frequency. A plurality of recovery circuits may be used in a multi-phase inverter.