Patent · US Active

Protective circuit for protection of an appliance, in particular an electric motor, against thermal overloading

US7889462B2 · kind B2 · utility

0Cited by

10References

12Claims

0Family size

Assignee

Siemens Aktiengesellschaft · DE

Inventors

Konrad Spindler · Ursensollen, DE
Josef Koller · Erkrath, DE
Markus Meier · Aarau, CH
Johann Seitz · Amberg, DE
Andreas Fritsch · Eggstätt, DE

Key dates

Filing date	Sep 6, 2006
Grant date	Feb 15, 2011
Priority date	—
Expiry date	Dec 30, 2026

Classification

Technology area (CPC Y)Emerging Cross-Sectional Technologies
CPC primaryY10S388/909
WIPO fieldElectrical machinery, apparatus, energy
WIPO sectorElectrical engineering

Abstract

At least one embodiment of the invention relates to a protective circuit for protection of an appliance, in particular of an electric motor, against thermal overloading. In at least one embodiment, the protective circuit includes a first and a second terminal for connecting a temperature detection element; a detection unit for detecting whether a resistance value of the temperature detector element which is connected between the first and the second terminals, is in a first or a second resistance range; a short-circuit detector for identifying whether there is a short circuit between the first and the second terminals; signaling outputs for emitting signal messages to an evaluation unit when the detected resistance value is in the second resistance range and/or when a short circuit has been identified by the short-circuit detector; and a third terminal, which is connected to the second terminal via a predetermined resistance.

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