Method for detecting a switching position of a switching device

US9250294B2 · kind B2 · utility

Assignee

• Leopold KOSTAL GmbH & Co. KG · DE

Inventors

• Martin Wagner · Nattheim, DE
• Werner Thormann · Halver, DE
• Meinolf Kathol · Finnentrop, DE
• Rainer Buehlmann · Holzwickede, DE
• Sven Kober · Bonn, DE

Key dates

• Filing date: Dec 17, 2012
• Grant date: Feb 2, 2016
• Expiry date: Jun 12, 2034

Classification

• Technology area (CPC H): Electricity
• CPC primary: H01H2239/012
• WIPO field: Measurement
• WIPO sector: Instruments

Abstract

A switch is formed by a branch including a measurement resistance and a selectable one of switching resistances having different nominal values such that a switch position depends on which switching resistance is selected. The measurement resistance is connected through the selected switching resistance to a supply voltage whereby a voltage drop dependent on the switch position is across the measurement resistance. A controller identifies the switch position by comparison of a measured value (UM1) of the voltage drop with target voltage drops corresponding to switch positions, calculates a voltage drop (Uges) across the branch based on nominal values of the measurement and selected switching resistances and the supply voltage, forms a difference value (UDiff) between a measured value (UVcc) of the supply voltage and the branch voltage drop (Uges), and qualifies the identified switch position as faulty when the difference value (UDiff) exceeds a difference threshold value (UDiff-S).