Device for determining a position of an element

US10458814B2 · kind B2 · utility

Assignee

• ZF FRIEDRICHSHAFEN AG · DE

Inventors

• Joachim Degen · Schermbeck, DE
• Jorg Jahn · Jülich, DE

Key dates

• Filing date: Dec 15, 2015
• Grant date: Oct 29, 2019
• Expiry date: Dec 15, 2035

Classification

• Technology area (CPC H): Electricity
• CPC primary: H03K19/21
• WIPO field: Measurement
• WIPO sector: Instruments

Abstract

A device for inductive positioning comprises a coil, an element for influencing a magnetic field in the area of the coil, a signal generator for providing a digital signal and a delay element with an input and an output, wherein the delay element is designed on the basis of the coil and a delay period between a signal edge at the input and a corresponding signal edge at the output is dependent on the inductance of the coil. The device further comprises a comparator to provide a digital differential impulse, whose length is dependent on a time difference of corresponding signal edges at the input and the output of the delay element, an integrator to provide a voltage depending on the length of the differential impulse and an evaluator to determine the position of the coil in reference to the coil based the voltage.