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. 19, 2002
Filed:
Aug. 30, 2001
Nils-Ole Harvest, Nordborg, DK;
Danfoss Compressors GmbH, Flensburg, DE;
Abstract
A method and power supply device for generating a regulated direct voltage from an alternating voltage using a step-down transformer, a step-up transformer, an inductance coil and a control device that controls the transformer in a step-down or step-up transformation mode is disclosed herein. An inductance coil voltage measuring signal is compared with three limiting values (A, B, C), wherein A corresponds to zero, B lies between A and C and B and C correspond to the direct voltage. Switching from the step-down to the step-up transformation mode is effected when the increasing voltage measuring signal drops after reaching B and A is not reached again and increases to C instead. Switching from step-down to step-up transformation mode is effected when the decreasing voltage measuring signal increases after reaching A and B is not reached and drops to A instead. In the power supply device, the control device includes three comparators for comparing the limiting values (A, B, C) with the voltage measuring signal of a voltage measuring device, wherein at least B anc C are dependent upon regulation deviation.