Microcontroller-based interface circuit for inductive sensors

Kokolanski, Zivko; Jordana Barnils, José; Gasulla Forner, Manuel; Dimcev, Vladimir; Reverter Cubarsí, Ferran

doi:10.1016/j.proeng.2014.11.411

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Kokolanski, Zivko

Jordana Barnils, José

Gasulla Forner, Manuel

Dimcev, Vladimir

Reverter Cubarsí, Ferran

Document typeOther

Date issued2014

Rights accessOpen Access

Abstract

This work proposes a fully-digital interface circuit for the measurement of inductive sensors using a low-cost microcontroller (µC) and without any intermediate active circuit. Apart from the µC and the sensor, the circuit just requires an external resistor and a reference inductance so that two RL circuits with a high-pass filter (HPF) topology are formed. The µC appropriately excites such RL circuits in order to measure the discharging time of the voltage across each inductance (i.e. sensing and reference) and then it uses such discharging times to estimate the sensor inductance. Experimental tests using a commercial µC show a non-linearity error (NLE) lower than 0.5%FSS (Full-Scale Span) when measuring inductances from 1 mH to 10 mH, and from 10 mH to 100 mH.

CitationKokolanski, Z. [et al.]. Microcontroller-based interface circuit for inductive sensors. A: Eurosensors. "Procedia Engineering". Brescia: 2014, p. 1251-1254.

URIhttp://hdl.handle.net/2117/27327

DOI10.1016/j.proeng.2014.11.411

ISBNISSN 1877-7058

Publisher versionhttp://www.sciencedirect.com/science/article/pii/S1877705814025260