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:
Oct. 16, 2001
Filed:
Apr. 11, 2000
Simon Krugly, Camarillo, CA (US);
Power-One, Inc., Camarillo, CA (US);
Abstract
A single-ended DC-to-DC converter includes a power transformer having a primary winding and a secondary winding, with a primary switch and an input voltage source coupled in series with the primary winding of the transformer. The primary switch is periodically made active upon application of a control input to permit current flow through the primary winding. The primary switch further has a parasitic capacitance. In a first embodiment of the invention, a reset circuit is provided including an auxiliary switch, an auxiliary voltage source coupled to the auxiliary switch, and a diode coupled between the auxiliary switch and the secondary winding of the transformer. The auxiliary switch is made active when the primary switch is inactive. During off periods of the primary switch, the transformer is reset in part by resonating magnetizing energy from the transformer to the parasitic capacitance and in part by clamping the secondary winding of the transformer to the auxiliary voltage source through the auxiliary switch and the diode. The single-ended converter further comprises at least one synchronous rectification device having a control terminal responsive a voltage present on the secondary winding to thereby conduct a load current.