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:
Mar. 07, 2017
Filed:
Dec. 18, 2014
Bose Corporation, Framingham, MA (US);
Manoel Soares, Natick, MA (US);
Bose Corporation, Framingham, MA (US);
Abstract
An example apparatus may include a power supply circuit comprising a first stage, the first stage comprising a current-fed topology and a transformer for isolating a primary side of the first stage from a secondary side of the first stage; a control module configured to provide control signals to one or more switches of the power supply circuit and to perform startup operations comprising: determining a peak line voltage value of an AC input voltage to the power supply circuit; initiating, when the power supply circuit is started, a hard-switching method; determining a center tap voltage of the transformer; stopping the hard-switching method, when the center tap voltage crosses a fraction of the peak line voltage value; and initiating, when the hard-switching method stops, a zero-voltage switching method with peak current mode control.