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:
Dec. 20, 2016
Filed:
May. 08, 2015
Andreas Stihl Ag & Co. KG, Waiblingen, DE;
Kay-Steffen Gurr, Heilbronn, DE;
Gernot Liebhard, Waiblingen, DE;
Rene Wichert, Durlangen, DE;
Rudolf Saemann, Balingen, DE;
Andreas Stihl AG & Co. KG, Waiblingen, DE;
Abstract
A capacitor power supply unit converts a mains voltage (U) into a lower operating voltage (V) for a controller and a supply voltage (V) for an electrical small load. A series circuit including a mains capacitor and a zener diode is connected to the mains voltage (U) whereat the supply voltage (V) for an electrical small load having a permissible operating voltage is tapped off. The capacitor power supply unit provides for the supply voltage (V) to be greater than the permissible operating voltage of the electrical small load and for the small load to be connected to the supply voltage (V) via a buck converter. Here, the buck converter is controlled as a current source having a variable operating frequency.