Patent · US Active

Handheld work apparatus having a control unit for operating an electric load

US8667955B2 · kind B2 · utility

0Cited by

4References

10Claims

0Family size

Assignee

Andreas Stihl AG & Co. KG · DE

Inventors

Heinrich Leufen · Schwaikheim, DE
Jörg Präger · Winnenden, DE
David Fallscheer · Echterdingen, DE

Key dates

Filing date	Apr 20, 2012
Grant date	Mar 11, 2014
Priority date	—
Expiry date	Apr 20, 2032

Classification

Technology area (CPC F)Mechanical Engineering; Lighting; Heating
CPC primaryF02M15/04
WIPO fieldEngines, pumps, turbines
WIPO sectorMechanical engineering

Abstract

A handheld work apparatus has a drive motor which drives a work tool and a generator. The work apparatus has a first electrical load and a connectable second electrical load. The generator provides the electrical power for the simultaneous operation of the two loads. The work apparatus has a control unit for controlling the power supplied to the first electrical load. In order to supply approximately the same power independent of voltage fluctuations, a voltage monitoring circuit is provided which, in a first operating state, sets a first signal sequence for operating the first load and, in a second operating state, sets a different second signal sequence for operating the first load. The mean power of the first signal sequence and that of the other second signal sequence are approximately equal.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.