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:
Jan. 27, 2004
Filed:
Aug. 15, 2002
Andrew Ferencz, Southborough, MA (US);
Gregory A. Zvonar, Winchester, MA (US);
Galaxy Power, Inc., Westborough, MA (US);
Abstract
A synch FET power supply uses a plurality of electronic switches to periodically connect the primary of a transformer to a direct current input source of power to generate a time varying magnetic field. The time varying magnetic field is coupled to two secondary windings. An electronic switch connected to each secondary winding periodically connects its secondary to the other output terminal. A reference voltage is applied to the control circuits, and the control circuits adjust the switches so that the output voltage tracks the reference voltage. Logic AND gates control the “turn on” signals to the electronic switches in the secondary circuits so that the secondary windings are not connected to an output terminal until a “synch FET enable” signal is applied to the AND gates. During soft start, the secondary windings remain disconnected from an output terminal until a “synch FET enable” signal is applied to an input of the logic AND gates, and since the secondary windings do not provide a complete circuit between the output terminals, no power flows into the synch FET power supply even though a back bias is applied between the output terminals by another power source.