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Accuracy Analysis of Uce(on)-based Measurement of the Inverter Output Current at Higher Motor Speeds


Denk, Marco ; Lautner, Frank ; Bakran, Mark-M.:
Accuracy Analysis of Uce(on)-based Measurement of the Inverter Output Current at Higher Motor Speeds.
Veranstaltung: EPE 2017 ECCE Europe : 19th European Conference on Power Electronics and Applications , 11.09.2017 - 14.09.2017 , Warschau, Polen.
(Veranstaltungsbeitrag: Kongress/Konferenz/Symposium/Tagung , Paper )


This paper presents a new gate driver concept that consists of an integrated measurement of the junction temperature and the load current of a power module during inverter operation. For junction temperature measurement the gate driver identifies the temperature sensitive on-chip internal gate resistor by means of a small identification signal that is modulated onto the positive gate voltage. To determine the current trough the power demiconductor the new gate driver also measures the highly current sensitive on-state collector-emitter voltage drop Uce(on) and compensates the impact of the junction temperature on driver level. This combined measurement of a temperature-sensitive and a current-sensitive parameter enables accurate current measurement with lowest costs. From today´s point of view accuracies of 1-5% can be reached with reasonable efforts, but it´s hard to predict whether Uce(on)-based current measurement can ever cope with the stationary accuracy stated in the datasheets of conventional current sensors. However, it is found that the overall accuracy of Uce(on)-based current measurement profits from very good dynamic properties that become increasingly important in case of high motor speeds and fundamental frequencies. This paper investigates the overall accuracy of a current snesor system to measure a certain load current pointer at a motor speed of 3000 min-1. In d/q-coordinates the low-pass character of a conventional current sensor is found to be responsible for a deviation of the measured current pointer of up to 3.6%. In contrast, Uce(on)-based current measurement only deviates 0.4%. In this aspect, the better dynamic properties partially compensate the poorer stationary accuracy of Uce(on)-based current measurement and makes it interesting for lower perfomance control tasks in high motor speed drives.

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Publikationsform: Veranstaltungsbeitrag (Paper)
Begutachteter Beitrag: Ja
Institutionen der Universität: Fakultäten > Fakultät für Ingenieurwissenschaften > Lehrstuhl Mechatronik
Fakultäten > Fakultät für Ingenieurwissenschaften > Lehrstuhl Mechatronik > Lehrstuhl Mechatronik - Univ.-Prof. Dr.-Ing. Mark-M. Bakran
Fakultäten > Fakultät für Ingenieurwissenschaften
Titel an der UBT entstanden: Ja
Themengebiete aus DDC: 600 Technik, Medizin, angewandte Wissenschaften > 620 Ingenieurwissenschaften
Eingestellt am: 16 Jan 2018 08:09
Letzte Änderung: 16 Jan 2018 08:09
URI: https://eref.uni-bayreuth.de/id/eprint/41725