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Determination of Stray Inductance of Low Inductive Laminated Planar Multi-port BusBars using Vector Synthesis Method

Lookup NU author(s): Professor Volker Pickert, Dr Haimeng Wu, Dr Naayagi Ramasamy

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This is the authors' accepted manuscript of an article that has been published in its final definitive form by IEEE, 2019.

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Abstract

Laminated busbars connect capacitors with switching power modules and they are designed to have low stray inductance to minimize electromagnetic interference. Attempts to accurately measure the stray inductance of these busbars have not been successful. The challenge lies with the capacitors as each of them excite the busbar producing their individual stray inductances. These individual stray inductances cannot be arithmetically averaged to establish the total stray inductance that applies when all the capacitors excite the busbar at the same time. It is also not possible to measure the stray inductance by simultaneous excitation of each capacitor port using impedance analyzers. This paper presents a solution to the above dilemma. A vector synthesis method is proposed whereby the individual stray inductance from each capacitor port is measured using an impedance analyzer. Each stray inductance is then mapped into an x-y-z frame with a distinct direction. This mapping exercise allows the data to be vectored. The total stray inductance is then the sum of all the vectors. The effectiveness of the proposed method is demonstrated on a busbar designed for H-bridge inverters by comparing the simulation and practical results. The absolute error of the total stray inductance between the simulation and the proposed method is 0.48nH. The proposed method improves the accuracy by 16.6% compared to the conventional technique in measuring stray inductances.


Publication metadata

Author(s): Lu B, Pickert V, Hu J, Wu H, Naayagi RT, Kang W, Liao S

Publication type: Article

Publication status: Published

Journal: IEEE Transactions on Industrial Electronics

Year: 2019

Pages: Epub ahead of print

Online publication date: 21/02/2019

Acceptance date: 27/01/2019

ISSN (print): 0278-0046

ISSN (electronic): 1557-9948

Publisher: IEEE

URL: https://doi.org/10.1109/TIE.2019.2899547

DOI: 10.1109/TIE.2019.2899547


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