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Implementation of High Current Measurement Technology for Automotive Applications in Programmable Logic
KTH, School of Electrical Engineering and Computer Science (EECS).
2019 (English)Independent thesis Advanced level (degree of Master (Two Years)), 20 credits / 30 HE creditsStudent thesis
Abstract [en]

At Inmotion Technologies, a special method of measuring phase currents is usedin the high power inverters for automotive applications. This method requiresa considerable amount of control logic, currently implemented with discretelogic gates distributed over a number of integrated circuits. In this thesis, thefeasibility of replacing this with programmable logic hardware in one singlepackage is investigated.The theory behind the current measurement method as well as the operationof the discrete implementation is analysed and described. Requirements ona programmable logic device to implement this was identified and a suitabledevice chosen accordingly. A prototype was developed and tested, interfacingan existing product.Benefits in terms of cost and size are evaluated as well as required changesto the existing system and the possibility for improvements brought by such achange is analysed. Since the products in question have high requirements onfunctional safety, possible impacts in this regard are discussed.

Abstract [sv]

Inmotion Technologies använder en speciell metod för att mäta fasströmmari sina högeffektsväxelriktare för elektrisk motordrift i fordon. Denna metodkräver en ansenlig mängd styrlogik vilken för närvarande är implementerad meddiskreta grindar i ett antal integrerade kretsar. I det här examensarbetet undersöksgångbarheten i att ersätta dessa med programmerbar logik i en enda kapsel.Teorin bakom mätmetoden liksom funktionaliteten hos den diskreta implementationenanalyseras och beskrivs. Krav på en programmerbar integreradkrets indentifierades och en lämplig typ valdes i enlighet med dessa. En prototyptogs fram och testades som en del av en existerande produkt.Fördelar i form av kostnad och storlek utvärderas liksom nödvändiga förändringarav det existerande systemet samt de potentiella förbättringar en förändringav det här slaget kan tänkas medföra. Då produkterna i fråga har högakrav på funktionssäkerhet diskuteras även vilken inverkan teknikbytet kan ha idetta avseende.

Place, publisher, year, edition, pages
2019. , p. 71
Series
TRITA-EECS-EX ; 2019:7
National Category
Engineering and Technology
Identifiers
URN: urn:nbn:se:kth:diva-254390OAI: oai:DiVA.org:kth-254390DiVA, id: diva2:1331686
External cooperation
In Motion Technologies AB
Educational program
Master of Science - Systems, Control and Robotics
Examiners
Available from: 2019-06-27 Created: 2019-06-27 Last updated: 2019-06-27Bibliographically approved

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