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:
Apr. 08, 2008
Filed:
Apr. 29, 2005
Franz-otto Witte, Teningen, DE;
Christian Bock, Freiburg, DE;
Franz-Otto Witte, Teningen, DE;
Christian Bock, Freiburg, DE;
MICRONAS GmbH, Freiburg, DE;
Abstract
A DC voltage transformer includes an oscillator, which can be controlled in terms of a characteristic such as its phase and/or frequency, and a modulation circuit that provides a periodic or random control signal to the oscillator. A power switch is connected in series with an inductance between two power supply potentials, the power switch being switched between open and closed states. A first smoothing capacitor is connected directly between the two power supply potentials, and a second smoothing capacitor is arranged in series with a Zener diode, with both the capacitor and diode being connected in parallel with the main terminals of the power switch. A modulated reference signal form the oscillator is connected to the control input of the power switch. The modulation of the reference signal can be of any type, for example a periodic modulation that is a periodic variation of the phase and/or the period of the reference signal made possible by for example a sine wave. The pulse duty factor of the reference signal is used to establish the relation between an input voltage and an output voltage of the transformer.