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:
Sep. 12, 2017
Filed:
Aug. 02, 2013
Emerson Network Power, Energy Systems, North America, Inc., Warrenville, IL (US);
Meng Wang, Xi'an, CN;
VERTIV ENERGY SYSTEMS, INC., Lombard, IL (US);
Abstract
The present invention discloses a lossless snubber circuit and an operation method thereof. The lossless snubber circuit includes a first snubber circuit. The first snubber circuit includes a first diode (D) and a capacitor (C). The capacitance of the capacitor (C) is big enough so that a voltage spike generated at the moment when a switch transistor (Q) is turned off is depressed by charging the capacitor (C). When the switch transistor (Q) is on, the electric charges released by the capacitor (C) are directed to a first capacitor (C) in a three-phase Vienna structure, so as to avoid the problem of voltage stress difference caused by the large quantity of electric charges released by the capacitor (C) flowing back to the switch transistor (Q).