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. 21, 2000
Filed:
Dec. 31, 1998
Roland Sylvere Saint-Pierre, Lawrenceville, GA (US);
Ashok R Patil, Duluth, GA (US);
John Wendell Oglesbee, Watkinsville, GA (US);
Motorola, Inc., Schaumburg, IL (US);
Abstract
A series-resonant power converter (10) featuring a tap winding (106) on a transformer (100) that is coupled to a resonant capacitor (124) in a resonant tank circuit (122). An output voltage is taken at a secondary (104) of the transformer (100) via a rectifier (110). A control circuit (140) is coupled to the output voltage to monitor the output voltage with respect to a reference to determine load conditions and to generate a control signal representative thereof. An energy recirculation circuit (180) is coupled to the control circuit (140) and to the voltage source (12) and comprises a switch (186) coupled to the tap winding (106) of the transformer (100). The switch (186) is responsive to the control signal to clamp the voltage across the resonant capacitor (124) when the control circuit (140) detects light load conditions to couple energy extracted from the resonant tank circuit (124) via the tap winding (106) to the voltage source (12), and otherwise to maintain the voltage across the resonant capacitor (124) unaffected when the control circuit (140) determines heavy load conditions.