NTC thermistor nonlinearity compensation using Wheatstone bridge and novel dual-stage single-flash piecewise-linear ADC

• Autorzy: Jovanović Jelena , Denić Dragan

Identyfikatory

DOI

10.24425/mms.2021.136616

• Języki publikacji: EN

Abstrakty

EN

NTC thermistors are frequently used low in cost temperature sensors which provide some of the most desirable sensing features. However, due to the nonlinear static transfer function their sensitivity decreases with temperature increase, causing lower measurement accuracy in some regions of the measurement range. This paper proposes a method for NTC thermistor nonlinearity compensation using a Wheatstone bridge and a novel dual-stage single-flash piecewise-linear ADC. Both conversion stages are performed using the same flash ADC of a novel design based on a reduced number of comparators employed. In this manner, simpler design, lower production costs, higher compactness and lower power consumption of the linearizing ADC, are achieved. The proposed linearizing method is tested on the Vishay NTCLE413E2103F520L thermistor, in the range from 0°C to 100°C, and the obtained results confirmed the effectiveness of the method in measurement accuracy improvement: when the flash ADC of 10-bit resolution is employed the accuracy obtained is 7.4747 ·10^-5°C.

Słowa kluczowe

EN

comparator count; dual-stage linearization; flash ADC; NTC thermistor; measurement accuracy; Wheatstone bridge

• Wydawca: Komitet Metrologii i Aparatury Naukowej PAN
• Czasopismo: Metrology and Measurement Systems
• Rocznik: 2021
• Tom: Vol. 28, nr 3
• Strony: 523--537
• Opis fizyczny: Bibliogr. 27 poz., rys., tab., wykr., wzory

Twórcy

autor

Jovanović Jelena

• University of Niš, Faculty of Electronic Engineering, Measurements Department, Aleksandra Medvedeva 14, 18000 Niš, Serbia

autor

Denić Dragan

• University of Niš, Faculty of Electronic Engineering, Measurements Department, Aleksandra Medvedeva 14, 18000 Niš, Serbia

Bibliografia

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Uwagi

1. This work has been supported by the Ministry of Education, Science and Technological Development of the Republic of Serbia.

2. Opracowanie rekordu ze środków MNiSW, umowa Nr 461252 w ramach programu "Społeczna odpowiedzialność nauki" - moduł: Popularyzacja nauki i promocja sportu (2021).