Invention Application
- Patent Title: ARRANGEMENT FOR FAILSAFE EVALUATION OF A POSITION ENCODER
- Patent Title (中): 对位置编码器的失效评估的安排
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Application No.: US12062867Application Date: 2008-04-04
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Publication No.: US20080246344A1Publication Date: 2008-10-09
- Inventor: Juergen Pullmann , Thomas Nitsche , Guenter Hornung , Christoph Zinser
- Applicant: Juergen Pullmann , Thomas Nitsche , Guenter Hornung , Christoph Zinser
- Priority: DE102005048601.0 20051006
- Main IPC: H02H1/00
- IPC: H02H1/00

Abstract:
A safety switching device comprises a position encoder, such as a potentiometer, for user selection of an operational quantity, such as an operating mode. The position encoder has a first terminal, a second terminal, and a tap moveable through a plurality of positions. A total impedance is defined between the first terminal and the second terminal. A first partial impedance is defined between the first terminal and the tap, and a second partial impedance is defined between the tap and the second terminal. An arrangement for determining an instantaneous position of the tap comprises a first evaluation circuit designed to determine a first measurement value representative of the first partial impedance, and a second evaluation circuit designed to determine a second measurement value representative of the second partial impedance. At least one from the first and second evaluation circuits is designed to determine the instantaneous position of the tap by means of the first and second measurement values.
Public/Granted literature
- US07705492B2 Arrangement for failsafe evaluation of a position encoder Public/Granted day:2010-04-27
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